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Linux/security/smack/smack_lsm.c

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  1 /*
  2  *  Simplified MAC Kernel (smack) security module
  3  *
  4  *  This file contains the smack hook function implementations.
  5  *
  6  *  Authors:
  7  *      Casey Schaufler <casey@schaufler-ca.com>
  8  *      Jarkko Sakkinen <jarkko.sakkinen@intel.com>
  9  *
 10  *  Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
 11  *  Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
 12  *                Paul Moore <paul@paul-moore.com>
 13  *  Copyright (C) 2010 Nokia Corporation
 14  *  Copyright (C) 2011 Intel Corporation.
 15  *
 16  *      This program is free software; you can redistribute it and/or modify
 17  *      it under the terms of the GNU General Public License version 2,
 18  *      as published by the Free Software Foundation.
 19  */
 20 
 21 #include <linux/xattr.h>
 22 #include <linux/pagemap.h>
 23 #include <linux/mount.h>
 24 #include <linux/stat.h>
 25 #include <linux/kd.h>
 26 #include <asm/ioctls.h>
 27 #include <linux/ip.h>
 28 #include <linux/tcp.h>
 29 #include <linux/udp.h>
 30 #include <linux/dccp.h>
 31 #include <linux/slab.h>
 32 #include <linux/mutex.h>
 33 #include <linux/pipe_fs_i.h>
 34 #include <net/cipso_ipv4.h>
 35 #include <net/ip.h>
 36 #include <net/ipv6.h>
 37 #include <linux/audit.h>
 38 #include <linux/magic.h>
 39 #include <linux/dcache.h>
 40 #include <linux/personality.h>
 41 #include <linux/msg.h>
 42 #include <linux/shm.h>
 43 #include <linux/binfmts.h>
 44 #include <linux/parser.h>
 45 #include "smack.h"
 46 
 47 #define TRANS_TRUE      "TRUE"
 48 #define TRANS_TRUE_SIZE 4
 49 
 50 #define SMK_CONNECTING  0
 51 #define SMK_RECEIVING   1
 52 #define SMK_SENDING     2
 53 
 54 #ifdef SMACK_IPV6_PORT_LABELING
 55 DEFINE_MUTEX(smack_ipv6_lock);
 56 static LIST_HEAD(smk_ipv6_port_list);
 57 #endif
 58 static struct kmem_cache *smack_inode_cache;
 59 int smack_enabled;
 60 
 61 static const match_table_t smk_mount_tokens = {
 62         {Opt_fsdefault, SMK_FSDEFAULT "%s"},
 63         {Opt_fsfloor, SMK_FSFLOOR "%s"},
 64         {Opt_fshat, SMK_FSHAT "%s"},
 65         {Opt_fsroot, SMK_FSROOT "%s"},
 66         {Opt_fstransmute, SMK_FSTRANS "%s"},
 67         {Opt_error, NULL},
 68 };
 69 
 70 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
 71 static char *smk_bu_mess[] = {
 72         "Bringup Error",        /* Unused */
 73         "Bringup",              /* SMACK_BRINGUP_ALLOW */
 74         "Unconfined Subject",   /* SMACK_UNCONFINED_SUBJECT */
 75         "Unconfined Object",    /* SMACK_UNCONFINED_OBJECT */
 76 };
 77 
 78 static void smk_bu_mode(int mode, char *s)
 79 {
 80         int i = 0;
 81 
 82         if (mode & MAY_READ)
 83                 s[i++] = 'r';
 84         if (mode & MAY_WRITE)
 85                 s[i++] = 'w';
 86         if (mode & MAY_EXEC)
 87                 s[i++] = 'x';
 88         if (mode & MAY_APPEND)
 89                 s[i++] = 'a';
 90         if (mode & MAY_TRANSMUTE)
 91                 s[i++] = 't';
 92         if (mode & MAY_LOCK)
 93                 s[i++] = 'l';
 94         if (i == 0)
 95                 s[i++] = '-';
 96         s[i] = '\0';
 97 }
 98 #endif
 99 
100 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
101 static int smk_bu_note(char *note, struct smack_known *sskp,
102                        struct smack_known *oskp, int mode, int rc)
103 {
104         char acc[SMK_NUM_ACCESS_TYPE + 1];
105 
106         if (rc <= 0)
107                 return rc;
108         if (rc > SMACK_UNCONFINED_OBJECT)
109                 rc = 0;
110 
111         smk_bu_mode(mode, acc);
112         pr_info("Smack %s: (%s %s %s) %s\n", smk_bu_mess[rc],
113                 sskp->smk_known, oskp->smk_known, acc, note);
114         return 0;
115 }
116 #else
117 #define smk_bu_note(note, sskp, oskp, mode, RC) (RC)
118 #endif
119 
120 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
121 static int smk_bu_current(char *note, struct smack_known *oskp,
122                           int mode, int rc)
123 {
124         struct task_smack *tsp = current_security();
125         char acc[SMK_NUM_ACCESS_TYPE + 1];
126 
127         if (rc <= 0)
128                 return rc;
129         if (rc > SMACK_UNCONFINED_OBJECT)
130                 rc = 0;
131 
132         smk_bu_mode(mode, acc);
133         pr_info("Smack %s: (%s %s %s) %s %s\n", smk_bu_mess[rc],
134                 tsp->smk_task->smk_known, oskp->smk_known,
135                 acc, current->comm, note);
136         return 0;
137 }
138 #else
139 #define smk_bu_current(note, oskp, mode, RC) (RC)
140 #endif
141 
142 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
143 static int smk_bu_task(struct task_struct *otp, int mode, int rc)
144 {
145         struct task_smack *tsp = current_security();
146         struct smack_known *smk_task = smk_of_task_struct(otp);
147         char acc[SMK_NUM_ACCESS_TYPE + 1];
148 
149         if (rc <= 0)
150                 return rc;
151         if (rc > SMACK_UNCONFINED_OBJECT)
152                 rc = 0;
153 
154         smk_bu_mode(mode, acc);
155         pr_info("Smack %s: (%s %s %s) %s to %s\n", smk_bu_mess[rc],
156                 tsp->smk_task->smk_known, smk_task->smk_known, acc,
157                 current->comm, otp->comm);
158         return 0;
159 }
160 #else
161 #define smk_bu_task(otp, mode, RC) (RC)
162 #endif
163 
164 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
165 static int smk_bu_inode(struct inode *inode, int mode, int rc)
166 {
167         struct task_smack *tsp = current_security();
168         struct inode_smack *isp = inode->i_security;
169         char acc[SMK_NUM_ACCESS_TYPE + 1];
170 
171         if (isp->smk_flags & SMK_INODE_IMPURE)
172                 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
173                         inode->i_sb->s_id, inode->i_ino, current->comm);
174 
175         if (rc <= 0)
176                 return rc;
177         if (rc > SMACK_UNCONFINED_OBJECT)
178                 rc = 0;
179         if (rc == SMACK_UNCONFINED_SUBJECT &&
180             (mode & (MAY_WRITE | MAY_APPEND)))
181                 isp->smk_flags |= SMK_INODE_IMPURE;
182 
183         smk_bu_mode(mode, acc);
184 
185         pr_info("Smack %s: (%s %s %s) inode=(%s %ld) %s\n", smk_bu_mess[rc],
186                 tsp->smk_task->smk_known, isp->smk_inode->smk_known, acc,
187                 inode->i_sb->s_id, inode->i_ino, current->comm);
188         return 0;
189 }
190 #else
191 #define smk_bu_inode(inode, mode, RC) (RC)
192 #endif
193 
194 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
195 static int smk_bu_file(struct file *file, int mode, int rc)
196 {
197         struct task_smack *tsp = current_security();
198         struct smack_known *sskp = tsp->smk_task;
199         struct inode *inode = file_inode(file);
200         struct inode_smack *isp = inode->i_security;
201         char acc[SMK_NUM_ACCESS_TYPE + 1];
202 
203         if (isp->smk_flags & SMK_INODE_IMPURE)
204                 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
205                         inode->i_sb->s_id, inode->i_ino, current->comm);
206 
207         if (rc <= 0)
208                 return rc;
209         if (rc > SMACK_UNCONFINED_OBJECT)
210                 rc = 0;
211 
212         smk_bu_mode(mode, acc);
213         pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess[rc],
214                 sskp->smk_known, smk_of_inode(inode)->smk_known, acc,
215                 inode->i_sb->s_id, inode->i_ino, file,
216                 current->comm);
217         return 0;
218 }
219 #else
220 #define smk_bu_file(file, mode, RC) (RC)
221 #endif
222 
223 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
224 static int smk_bu_credfile(const struct cred *cred, struct file *file,
225                                 int mode, int rc)
226 {
227         struct task_smack *tsp = cred->security;
228         struct smack_known *sskp = tsp->smk_task;
229         struct inode *inode = file_inode(file);
230         struct inode_smack *isp = inode->i_security;
231         char acc[SMK_NUM_ACCESS_TYPE + 1];
232 
233         if (isp->smk_flags & SMK_INODE_IMPURE)
234                 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
235                         inode->i_sb->s_id, inode->i_ino, current->comm);
236 
237         if (rc <= 0)
238                 return rc;
239         if (rc > SMACK_UNCONFINED_OBJECT)
240                 rc = 0;
241 
242         smk_bu_mode(mode, acc);
243         pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess[rc],
244                 sskp->smk_known, smk_of_inode(inode)->smk_known, acc,
245                 inode->i_sb->s_id, inode->i_ino, file,
246                 current->comm);
247         return 0;
248 }
249 #else
250 #define smk_bu_credfile(cred, file, mode, RC) (RC)
251 #endif
252 
253 /**
254  * smk_fetch - Fetch the smack label from a file.
255  * @name: type of the label (attribute)
256  * @ip: a pointer to the inode
257  * @dp: a pointer to the dentry
258  *
259  * Returns a pointer to the master list entry for the Smack label,
260  * NULL if there was no label to fetch, or an error code.
261  */
262 static struct smack_known *smk_fetch(const char *name, struct inode *ip,
263                                         struct dentry *dp)
264 {
265         int rc;
266         char *buffer;
267         struct smack_known *skp = NULL;
268 
269         if (!(ip->i_opflags & IOP_XATTR))
270                 return ERR_PTR(-EOPNOTSUPP);
271 
272         buffer = kzalloc(SMK_LONGLABEL, GFP_KERNEL);
273         if (buffer == NULL)
274                 return ERR_PTR(-ENOMEM);
275 
276         rc = __vfs_getxattr(dp, ip, name, buffer, SMK_LONGLABEL);
277         if (rc < 0)
278                 skp = ERR_PTR(rc);
279         else if (rc == 0)
280                 skp = NULL;
281         else
282                 skp = smk_import_entry(buffer, rc);
283 
284         kfree(buffer);
285 
286         return skp;
287 }
288 
289 /**
290  * new_inode_smack - allocate an inode security blob
291  * @skp: a pointer to the Smack label entry to use in the blob
292  *
293  * Returns the new blob or NULL if there's no memory available
294  */
295 static struct inode_smack *new_inode_smack(struct smack_known *skp)
296 {
297         struct inode_smack *isp;
298 
299         isp = kmem_cache_zalloc(smack_inode_cache, GFP_NOFS);
300         if (isp == NULL)
301                 return NULL;
302 
303         isp->smk_inode = skp;
304         isp->smk_flags = 0;
305         mutex_init(&isp->smk_lock);
306 
307         return isp;
308 }
309 
310 /**
311  * new_task_smack - allocate a task security blob
312  * @task: a pointer to the Smack label for the running task
313  * @forked: a pointer to the Smack label for the forked task
314  * @gfp: type of the memory for the allocation
315  *
316  * Returns the new blob or NULL if there's no memory available
317  */
318 static struct task_smack *new_task_smack(struct smack_known *task,
319                                         struct smack_known *forked, gfp_t gfp)
320 {
321         struct task_smack *tsp;
322 
323         tsp = kzalloc(sizeof(struct task_smack), gfp);
324         if (tsp == NULL)
325                 return NULL;
326 
327         tsp->smk_task = task;
328         tsp->smk_forked = forked;
329         INIT_LIST_HEAD(&tsp->smk_rules);
330         INIT_LIST_HEAD(&tsp->smk_relabel);
331         mutex_init(&tsp->smk_rules_lock);
332 
333         return tsp;
334 }
335 
336 /**
337  * smk_copy_rules - copy a rule set
338  * @nhead: new rules header pointer
339  * @ohead: old rules header pointer
340  * @gfp: type of the memory for the allocation
341  *
342  * Returns 0 on success, -ENOMEM on error
343  */
344 static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead,
345                                 gfp_t gfp)
346 {
347         struct smack_rule *nrp;
348         struct smack_rule *orp;
349         int rc = 0;
350 
351         list_for_each_entry_rcu(orp, ohead, list) {
352                 nrp = kzalloc(sizeof(struct smack_rule), gfp);
353                 if (nrp == NULL) {
354                         rc = -ENOMEM;
355                         break;
356                 }
357                 *nrp = *orp;
358                 list_add_rcu(&nrp->list, nhead);
359         }
360         return rc;
361 }
362 
363 /**
364  * smk_copy_relabel - copy smk_relabel labels list
365  * @nhead: new rules header pointer
366  * @ohead: old rules header pointer
367  * @gfp: type of the memory for the allocation
368  *
369  * Returns 0 on success, -ENOMEM on error
370  */
371 static int smk_copy_relabel(struct list_head *nhead, struct list_head *ohead,
372                                 gfp_t gfp)
373 {
374         struct smack_known_list_elem *nklep;
375         struct smack_known_list_elem *oklep;
376 
377         list_for_each_entry(oklep, ohead, list) {
378                 nklep = kzalloc(sizeof(struct smack_known_list_elem), gfp);
379                 if (nklep == NULL) {
380                         smk_destroy_label_list(nhead);
381                         return -ENOMEM;
382                 }
383                 nklep->smk_label = oklep->smk_label;
384                 list_add(&nklep->list, nhead);
385         }
386 
387         return 0;
388 }
389 
390 /**
391  * smk_ptrace_mode - helper function for converting PTRACE_MODE_* into MAY_*
392  * @mode - input mode in form of PTRACE_MODE_*
393  *
394  * Returns a converted MAY_* mode usable by smack rules
395  */
396 static inline unsigned int smk_ptrace_mode(unsigned int mode)
397 {
398         if (mode & PTRACE_MODE_ATTACH)
399                 return MAY_READWRITE;
400         if (mode & PTRACE_MODE_READ)
401                 return MAY_READ;
402 
403         return 0;
404 }
405 
406 /**
407  * smk_ptrace_rule_check - helper for ptrace access
408  * @tracer: tracer process
409  * @tracee_known: label entry of the process that's about to be traced
410  * @mode: ptrace attachment mode (PTRACE_MODE_*)
411  * @func: name of the function that called us, used for audit
412  *
413  * Returns 0 on access granted, -error on error
414  */
415 static int smk_ptrace_rule_check(struct task_struct *tracer,
416                                  struct smack_known *tracee_known,
417                                  unsigned int mode, const char *func)
418 {
419         int rc;
420         struct smk_audit_info ad, *saip = NULL;
421         struct task_smack *tsp;
422         struct smack_known *tracer_known;
423 
424         if ((mode & PTRACE_MODE_NOAUDIT) == 0) {
425                 smk_ad_init(&ad, func, LSM_AUDIT_DATA_TASK);
426                 smk_ad_setfield_u_tsk(&ad, tracer);
427                 saip = &ad;
428         }
429 
430         rcu_read_lock();
431         tsp = __task_cred(tracer)->security;
432         tracer_known = smk_of_task(tsp);
433 
434         if ((mode & PTRACE_MODE_ATTACH) &&
435             (smack_ptrace_rule == SMACK_PTRACE_EXACT ||
436              smack_ptrace_rule == SMACK_PTRACE_DRACONIAN)) {
437                 if (tracer_known->smk_known == tracee_known->smk_known)
438                         rc = 0;
439                 else if (smack_ptrace_rule == SMACK_PTRACE_DRACONIAN)
440                         rc = -EACCES;
441                 else if (capable(CAP_SYS_PTRACE))
442                         rc = 0;
443                 else
444                         rc = -EACCES;
445 
446                 if (saip)
447                         smack_log(tracer_known->smk_known,
448                                   tracee_known->smk_known,
449                                   0, rc, saip);
450 
451                 rcu_read_unlock();
452                 return rc;
453         }
454 
455         /* In case of rule==SMACK_PTRACE_DEFAULT or mode==PTRACE_MODE_READ */
456         rc = smk_tskacc(tsp, tracee_known, smk_ptrace_mode(mode), saip);
457 
458         rcu_read_unlock();
459         return rc;
460 }
461 
462 /*
463  * LSM hooks.
464  * We he, that is fun!
465  */
466 
467 /**
468  * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH
469  * @ctp: child task pointer
470  * @mode: ptrace attachment mode (PTRACE_MODE_*)
471  *
472  * Returns 0 if access is OK, an error code otherwise
473  *
474  * Do the capability checks.
475  */
476 static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode)
477 {
478         struct smack_known *skp;
479 
480         skp = smk_of_task_struct(ctp);
481 
482         return smk_ptrace_rule_check(current, skp, mode, __func__);
483 }
484 
485 /**
486  * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME
487  * @ptp: parent task pointer
488  *
489  * Returns 0 if access is OK, an error code otherwise
490  *
491  * Do the capability checks, and require PTRACE_MODE_ATTACH.
492  */
493 static int smack_ptrace_traceme(struct task_struct *ptp)
494 {
495         int rc;
496         struct smack_known *skp;
497 
498         skp = smk_of_task(current_security());
499 
500         rc = smk_ptrace_rule_check(ptp, skp, PTRACE_MODE_ATTACH, __func__);
501         return rc;
502 }
503 
504 /**
505  * smack_syslog - Smack approval on syslog
506  * @type: message type
507  *
508  * Returns 0 on success, error code otherwise.
509  */
510 static int smack_syslog(int typefrom_file)
511 {
512         int rc = 0;
513         struct smack_known *skp = smk_of_current();
514 
515         if (smack_privileged(CAP_MAC_OVERRIDE))
516                 return 0;
517 
518         if (smack_syslog_label != NULL && smack_syslog_label != skp)
519                 rc = -EACCES;
520 
521         return rc;
522 }
523 
524 
525 /*
526  * Superblock Hooks.
527  */
528 
529 /**
530  * smack_sb_alloc_security - allocate a superblock blob
531  * @sb: the superblock getting the blob
532  *
533  * Returns 0 on success or -ENOMEM on error.
534  */
535 static int smack_sb_alloc_security(struct super_block *sb)
536 {
537         struct superblock_smack *sbsp;
538 
539         sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL);
540 
541         if (sbsp == NULL)
542                 return -ENOMEM;
543 
544         sbsp->smk_root = &smack_known_floor;
545         sbsp->smk_default = &smack_known_floor;
546         sbsp->smk_floor = &smack_known_floor;
547         sbsp->smk_hat = &smack_known_hat;
548         /*
549          * SMK_SB_INITIALIZED will be zero from kzalloc.
550          */
551         sb->s_security = sbsp;
552 
553         return 0;
554 }
555 
556 /**
557  * smack_sb_free_security - free a superblock blob
558  * @sb: the superblock getting the blob
559  *
560  */
561 static void smack_sb_free_security(struct super_block *sb)
562 {
563         kfree(sb->s_security);
564         sb->s_security = NULL;
565 }
566 
567 /**
568  * smack_sb_copy_data - copy mount options data for processing
569  * @orig: where to start
570  * @smackopts: mount options string
571  *
572  * Returns 0 on success or -ENOMEM on error.
573  *
574  * Copy the Smack specific mount options out of the mount
575  * options list.
576  */
577 static int smack_sb_copy_data(char *orig, char *smackopts)
578 {
579         char *cp, *commap, *otheropts, *dp;
580 
581         otheropts = (char *)get_zeroed_page(GFP_KERNEL);
582         if (otheropts == NULL)
583                 return -ENOMEM;
584 
585         for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) {
586                 if (strstr(cp, SMK_FSDEFAULT) == cp)
587                         dp = smackopts;
588                 else if (strstr(cp, SMK_FSFLOOR) == cp)
589                         dp = smackopts;
590                 else if (strstr(cp, SMK_FSHAT) == cp)
591                         dp = smackopts;
592                 else if (strstr(cp, SMK_FSROOT) == cp)
593                         dp = smackopts;
594                 else if (strstr(cp, SMK_FSTRANS) == cp)
595                         dp = smackopts;
596                 else
597                         dp = otheropts;
598 
599                 commap = strchr(cp, ',');
600                 if (commap != NULL)
601                         *commap = '\0';
602 
603                 if (*dp != '\0')
604                         strcat(dp, ",");
605                 strcat(dp, cp);
606         }
607 
608         strcpy(orig, otheropts);
609         free_page((unsigned long)otheropts);
610 
611         return 0;
612 }
613 
614 /**
615  * smack_parse_opts_str - parse Smack specific mount options
616  * @options: mount options string
617  * @opts: where to store converted mount opts
618  *
619  * Returns 0 on success or -ENOMEM on error.
620  *
621  * converts Smack specific mount options to generic security option format
622  */
623 static int smack_parse_opts_str(char *options,
624                 struct security_mnt_opts *opts)
625 {
626         char *p;
627         char *fsdefault = NULL;
628         char *fsfloor = NULL;
629         char *fshat = NULL;
630         char *fsroot = NULL;
631         char *fstransmute = NULL;
632         int rc = -ENOMEM;
633         int num_mnt_opts = 0;
634         int token;
635 
636         opts->num_mnt_opts = 0;
637 
638         if (!options)
639                 return 0;
640 
641         while ((p = strsep(&options, ",")) != NULL) {
642                 substring_t args[MAX_OPT_ARGS];
643 
644                 if (!*p)
645                         continue;
646 
647                 token = match_token(p, smk_mount_tokens, args);
648 
649                 switch (token) {
650                 case Opt_fsdefault:
651                         if (fsdefault)
652                                 goto out_opt_err;
653                         fsdefault = match_strdup(&args[0]);
654                         if (!fsdefault)
655                                 goto out_err;
656                         break;
657                 case Opt_fsfloor:
658                         if (fsfloor)
659                                 goto out_opt_err;
660                         fsfloor = match_strdup(&args[0]);
661                         if (!fsfloor)
662                                 goto out_err;
663                         break;
664                 case Opt_fshat:
665                         if (fshat)
666                                 goto out_opt_err;
667                         fshat = match_strdup(&args[0]);
668                         if (!fshat)
669                                 goto out_err;
670                         break;
671                 case Opt_fsroot:
672                         if (fsroot)
673                                 goto out_opt_err;
674                         fsroot = match_strdup(&args[0]);
675                         if (!fsroot)
676                                 goto out_err;
677                         break;
678                 case Opt_fstransmute:
679                         if (fstransmute)
680                                 goto out_opt_err;
681                         fstransmute = match_strdup(&args[0]);
682                         if (!fstransmute)
683                                 goto out_err;
684                         break;
685                 default:
686                         rc = -EINVAL;
687                         pr_warn("Smack:  unknown mount option\n");
688                         goto out_err;
689                 }
690         }
691 
692         opts->mnt_opts = kcalloc(NUM_SMK_MNT_OPTS, sizeof(char *), GFP_KERNEL);
693         if (!opts->mnt_opts)
694                 goto out_err;
695 
696         opts->mnt_opts_flags = kcalloc(NUM_SMK_MNT_OPTS, sizeof(int),
697                         GFP_KERNEL);
698         if (!opts->mnt_opts_flags)
699                 goto out_err;
700 
701         if (fsdefault) {
702                 opts->mnt_opts[num_mnt_opts] = fsdefault;
703                 opts->mnt_opts_flags[num_mnt_opts++] = FSDEFAULT_MNT;
704         }
705         if (fsfloor) {
706                 opts->mnt_opts[num_mnt_opts] = fsfloor;
707                 opts->mnt_opts_flags[num_mnt_opts++] = FSFLOOR_MNT;
708         }
709         if (fshat) {
710                 opts->mnt_opts[num_mnt_opts] = fshat;
711                 opts->mnt_opts_flags[num_mnt_opts++] = FSHAT_MNT;
712         }
713         if (fsroot) {
714                 opts->mnt_opts[num_mnt_opts] = fsroot;
715                 opts->mnt_opts_flags[num_mnt_opts++] = FSROOT_MNT;
716         }
717         if (fstransmute) {
718                 opts->mnt_opts[num_mnt_opts] = fstransmute;
719                 opts->mnt_opts_flags[num_mnt_opts++] = FSTRANS_MNT;
720         }
721 
722         opts->num_mnt_opts = num_mnt_opts;
723         return 0;
724 
725 out_opt_err:
726         rc = -EINVAL;
727         pr_warn("Smack: duplicate mount options\n");
728 
729 out_err:
730         kfree(fsdefault);
731         kfree(fsfloor);
732         kfree(fshat);
733         kfree(fsroot);
734         kfree(fstransmute);
735         return rc;
736 }
737 
738 /**
739  * smack_set_mnt_opts - set Smack specific mount options
740  * @sb: the file system superblock
741  * @opts: Smack mount options
742  * @kern_flags: mount option from kernel space or user space
743  * @set_kern_flags: where to store converted mount opts
744  *
745  * Returns 0 on success, an error code on failure
746  *
747  * Allow filesystems with binary mount data to explicitly set Smack mount
748  * labels.
749  */
750 static int smack_set_mnt_opts(struct super_block *sb,
751                 struct security_mnt_opts *opts,
752                 unsigned long kern_flags,
753                 unsigned long *set_kern_flags)
754 {
755         struct dentry *root = sb->s_root;
756         struct inode *inode = d_backing_inode(root);
757         struct superblock_smack *sp = sb->s_security;
758         struct inode_smack *isp;
759         struct smack_known *skp;
760         int i;
761         int num_opts = opts->num_mnt_opts;
762         int transmute = 0;
763 
764         if (sp->smk_flags & SMK_SB_INITIALIZED)
765                 return 0;
766 
767         if (!smack_privileged(CAP_MAC_ADMIN)) {
768                 /*
769                  * Unprivileged mounts don't get to specify Smack values.
770                  */
771                 if (num_opts)
772                         return -EPERM;
773                 /*
774                  * Unprivileged mounts get root and default from the caller.
775                  */
776                 skp = smk_of_current();
777                 sp->smk_root = skp;
778                 sp->smk_default = skp;
779                 /*
780                  * For a handful of fs types with no user-controlled
781                  * backing store it's okay to trust security labels
782                  * in the filesystem. The rest are untrusted.
783                  */
784                 if (sb->s_user_ns != &init_user_ns &&
785                     sb->s_magic != SYSFS_MAGIC && sb->s_magic != TMPFS_MAGIC &&
786                     sb->s_magic != RAMFS_MAGIC) {
787                         transmute = 1;
788                         sp->smk_flags |= SMK_SB_UNTRUSTED;
789                 }
790         }
791 
792         sp->smk_flags |= SMK_SB_INITIALIZED;
793 
794         for (i = 0; i < num_opts; i++) {
795                 switch (opts->mnt_opts_flags[i]) {
796                 case FSDEFAULT_MNT:
797                         skp = smk_import_entry(opts->mnt_opts[i], 0);
798                         if (IS_ERR(skp))
799                                 return PTR_ERR(skp);
800                         sp->smk_default = skp;
801                         break;
802                 case FSFLOOR_MNT:
803                         skp = smk_import_entry(opts->mnt_opts[i], 0);
804                         if (IS_ERR(skp))
805                                 return PTR_ERR(skp);
806                         sp->smk_floor = skp;
807                         break;
808                 case FSHAT_MNT:
809                         skp = smk_import_entry(opts->mnt_opts[i], 0);
810                         if (IS_ERR(skp))
811                                 return PTR_ERR(skp);
812                         sp->smk_hat = skp;
813                         break;
814                 case FSROOT_MNT:
815                         skp = smk_import_entry(opts->mnt_opts[i], 0);
816                         if (IS_ERR(skp))
817                                 return PTR_ERR(skp);
818                         sp->smk_root = skp;
819                         break;
820                 case FSTRANS_MNT:
821                         skp = smk_import_entry(opts->mnt_opts[i], 0);
822                         if (IS_ERR(skp))
823                                 return PTR_ERR(skp);
824                         sp->smk_root = skp;
825                         transmute = 1;
826                         break;
827                 default:
828                         break;
829                 }
830         }
831 
832         /*
833          * Initialize the root inode.
834          */
835         isp = inode->i_security;
836         if (isp == NULL) {
837                 isp = new_inode_smack(sp->smk_root);
838                 if (isp == NULL)
839                         return -ENOMEM;
840                 inode->i_security = isp;
841         } else
842                 isp->smk_inode = sp->smk_root;
843 
844         if (transmute)
845                 isp->smk_flags |= SMK_INODE_TRANSMUTE;
846 
847         return 0;
848 }
849 
850 /**
851  * smack_sb_kern_mount - Smack specific mount processing
852  * @sb: the file system superblock
853  * @flags: the mount flags
854  * @data: the smack mount options
855  *
856  * Returns 0 on success, an error code on failure
857  */
858 static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data)
859 {
860         int rc = 0;
861         char *options = data;
862         struct security_mnt_opts opts;
863 
864         security_init_mnt_opts(&opts);
865 
866         if (!options)
867                 goto out;
868 
869         rc = smack_parse_opts_str(options, &opts);
870         if (rc)
871                 goto out_err;
872 
873 out:
874         rc = smack_set_mnt_opts(sb, &opts, 0, NULL);
875 
876 out_err:
877         security_free_mnt_opts(&opts);
878         return rc;
879 }
880 
881 /**
882  * smack_sb_statfs - Smack check on statfs
883  * @dentry: identifies the file system in question
884  *
885  * Returns 0 if current can read the floor of the filesystem,
886  * and error code otherwise
887  */
888 static int smack_sb_statfs(struct dentry *dentry)
889 {
890         struct superblock_smack *sbp = dentry->d_sb->s_security;
891         int rc;
892         struct smk_audit_info ad;
893 
894         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
895         smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
896 
897         rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad);
898         rc = smk_bu_current("statfs", sbp->smk_floor, MAY_READ, rc);
899         return rc;
900 }
901 
902 /*
903  * BPRM hooks
904  */
905 
906 /**
907  * smack_bprm_set_creds - set creds for exec
908  * @bprm: the exec information
909  *
910  * Returns 0 if it gets a blob, -EPERM if exec forbidden and -ENOMEM otherwise
911  */
912 static int smack_bprm_set_creds(struct linux_binprm *bprm)
913 {
914         struct inode *inode = file_inode(bprm->file);
915         struct task_smack *bsp = bprm->cred->security;
916         struct inode_smack *isp;
917         struct superblock_smack *sbsp;
918         int rc;
919 
920         if (bprm->cred_prepared)
921                 return 0;
922 
923         isp = inode->i_security;
924         if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task)
925                 return 0;
926 
927         sbsp = inode->i_sb->s_security;
928         if ((sbsp->smk_flags & SMK_SB_UNTRUSTED) &&
929             isp->smk_task != sbsp->smk_root)
930                 return 0;
931 
932         if (bprm->unsafe & LSM_UNSAFE_PTRACE) {
933                 struct task_struct *tracer;
934                 rc = 0;
935 
936                 rcu_read_lock();
937                 tracer = ptrace_parent(current);
938                 if (likely(tracer != NULL))
939                         rc = smk_ptrace_rule_check(tracer,
940                                                    isp->smk_task,
941                                                    PTRACE_MODE_ATTACH,
942                                                    __func__);
943                 rcu_read_unlock();
944 
945                 if (rc != 0)
946                         return rc;
947         } else if (bprm->unsafe)
948                 return -EPERM;
949 
950         bsp->smk_task = isp->smk_task;
951         bprm->per_clear |= PER_CLEAR_ON_SETID;
952 
953         return 0;
954 }
955 
956 /**
957  * smack_bprm_committing_creds - Prepare to install the new credentials
958  * from bprm.
959  *
960  * @bprm: binprm for exec
961  */
962 static void smack_bprm_committing_creds(struct linux_binprm *bprm)
963 {
964         struct task_smack *bsp = bprm->cred->security;
965 
966         if (bsp->smk_task != bsp->smk_forked)
967                 current->pdeath_signal = 0;
968 }
969 
970 /**
971  * smack_bprm_secureexec - Return the decision to use secureexec.
972  * @bprm: binprm for exec
973  *
974  * Returns 0 on success.
975  */
976 static int smack_bprm_secureexec(struct linux_binprm *bprm)
977 {
978         struct task_smack *tsp = current_security();
979 
980         if (tsp->smk_task != tsp->smk_forked)
981                 return 1;
982 
983         return 0;
984 }
985 
986 /*
987  * Inode hooks
988  */
989 
990 /**
991  * smack_inode_alloc_security - allocate an inode blob
992  * @inode: the inode in need of a blob
993  *
994  * Returns 0 if it gets a blob, -ENOMEM otherwise
995  */
996 static int smack_inode_alloc_security(struct inode *inode)
997 {
998         struct smack_known *skp = smk_of_current();
999 
1000         inode->i_security = new_inode_smack(skp);
1001         if (inode->i_security == NULL)
1002                 return -ENOMEM;
1003         return 0;
1004 }
1005 
1006 /**
1007  * smack_inode_free_rcu - Free inode_smack blob from cache
1008  * @head: the rcu_head for getting inode_smack pointer
1009  *
1010  *  Call back function called from call_rcu() to free
1011  *  the i_security blob pointer in inode
1012  */
1013 static void smack_inode_free_rcu(struct rcu_head *head)
1014 {
1015         struct inode_smack *issp;
1016 
1017         issp = container_of(head, struct inode_smack, smk_rcu);
1018         kmem_cache_free(smack_inode_cache, issp);
1019 }
1020 
1021 /**
1022  * smack_inode_free_security - free an inode blob using call_rcu()
1023  * @inode: the inode with a blob
1024  *
1025  * Clears the blob pointer in inode using RCU
1026  */
1027 static void smack_inode_free_security(struct inode *inode)
1028 {
1029         struct inode_smack *issp = inode->i_security;
1030 
1031         /*
1032          * The inode may still be referenced in a path walk and
1033          * a call to smack_inode_permission() can be made
1034          * after smack_inode_free_security() is called.
1035          * To avoid race condition free the i_security via RCU
1036          * and leave the current inode->i_security pointer intact.
1037          * The inode will be freed after the RCU grace period too.
1038          */
1039         call_rcu(&issp->smk_rcu, smack_inode_free_rcu);
1040 }
1041 
1042 /**
1043  * smack_inode_init_security - copy out the smack from an inode
1044  * @inode: the newly created inode
1045  * @dir: containing directory object
1046  * @qstr: unused
1047  * @name: where to put the attribute name
1048  * @value: where to put the attribute value
1049  * @len: where to put the length of the attribute
1050  *
1051  * Returns 0 if it all works out, -ENOMEM if there's no memory
1052  */
1053 static int smack_inode_init_security(struct inode *inode, struct inode *dir,
1054                                      const struct qstr *qstr, const char **name,
1055                                      void **value, size_t *len)
1056 {
1057         struct inode_smack *issp = inode->i_security;
1058         struct smack_known *skp = smk_of_current();
1059         struct smack_known *isp = smk_of_inode(inode);
1060         struct smack_known *dsp = smk_of_inode(dir);
1061         int may;
1062 
1063         if (name)
1064                 *name = XATTR_SMACK_SUFFIX;
1065 
1066         if (value && len) {
1067                 rcu_read_lock();
1068                 may = smk_access_entry(skp->smk_known, dsp->smk_known,
1069                                        &skp->smk_rules);
1070                 rcu_read_unlock();
1071 
1072                 /*
1073                  * If the access rule allows transmutation and
1074                  * the directory requests transmutation then
1075                  * by all means transmute.
1076                  * Mark the inode as changed.
1077                  */
1078                 if (may > 0 && ((may & MAY_TRANSMUTE) != 0) &&
1079                     smk_inode_transmutable(dir)) {
1080                         isp = dsp;
1081                         issp->smk_flags |= SMK_INODE_CHANGED;
1082                 }
1083 
1084                 *value = kstrdup(isp->smk_known, GFP_NOFS);
1085                 if (*value == NULL)
1086                         return -ENOMEM;
1087 
1088                 *len = strlen(isp->smk_known);
1089         }
1090 
1091         return 0;
1092 }
1093 
1094 /**
1095  * smack_inode_link - Smack check on link
1096  * @old_dentry: the existing object
1097  * @dir: unused
1098  * @new_dentry: the new object
1099  *
1100  * Returns 0 if access is permitted, an error code otherwise
1101  */
1102 static int smack_inode_link(struct dentry *old_dentry, struct inode *dir,
1103                             struct dentry *new_dentry)
1104 {
1105         struct smack_known *isp;
1106         struct smk_audit_info ad;
1107         int rc;
1108 
1109         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1110         smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
1111 
1112         isp = smk_of_inode(d_backing_inode(old_dentry));
1113         rc = smk_curacc(isp, MAY_WRITE, &ad);
1114         rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_WRITE, rc);
1115 
1116         if (rc == 0 && d_is_positive(new_dentry)) {
1117                 isp = smk_of_inode(d_backing_inode(new_dentry));
1118                 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
1119                 rc = smk_curacc(isp, MAY_WRITE, &ad);
1120                 rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_WRITE, rc);
1121         }
1122 
1123         return rc;
1124 }
1125 
1126 /**
1127  * smack_inode_unlink - Smack check on inode deletion
1128  * @dir: containing directory object
1129  * @dentry: file to unlink
1130  *
1131  * Returns 0 if current can write the containing directory
1132  * and the object, error code otherwise
1133  */
1134 static int smack_inode_unlink(struct inode *dir, struct dentry *dentry)
1135 {
1136         struct inode *ip = d_backing_inode(dentry);
1137         struct smk_audit_info ad;
1138         int rc;
1139 
1140         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1141         smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1142 
1143         /*
1144          * You need write access to the thing you're unlinking
1145          */
1146         rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad);
1147         rc = smk_bu_inode(ip, MAY_WRITE, rc);
1148         if (rc == 0) {
1149                 /*
1150                  * You also need write access to the containing directory
1151                  */
1152                 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
1153                 smk_ad_setfield_u_fs_inode(&ad, dir);
1154                 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
1155                 rc = smk_bu_inode(dir, MAY_WRITE, rc);
1156         }
1157         return rc;
1158 }
1159 
1160 /**
1161  * smack_inode_rmdir - Smack check on directory deletion
1162  * @dir: containing directory object
1163  * @dentry: directory to unlink
1164  *
1165  * Returns 0 if current can write the containing directory
1166  * and the directory, error code otherwise
1167  */
1168 static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry)
1169 {
1170         struct smk_audit_info ad;
1171         int rc;
1172 
1173         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1174         smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1175 
1176         /*
1177          * You need write access to the thing you're removing
1178          */
1179         rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1180         rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
1181         if (rc == 0) {
1182                 /*
1183                  * You also need write access to the containing directory
1184                  */
1185                 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
1186                 smk_ad_setfield_u_fs_inode(&ad, dir);
1187                 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
1188                 rc = smk_bu_inode(dir, MAY_WRITE, rc);
1189         }
1190 
1191         return rc;
1192 }
1193 
1194 /**
1195  * smack_inode_rename - Smack check on rename
1196  * @old_inode: unused
1197  * @old_dentry: the old object
1198  * @new_inode: unused
1199  * @new_dentry: the new object
1200  *
1201  * Read and write access is required on both the old and
1202  * new directories.
1203  *
1204  * Returns 0 if access is permitted, an error code otherwise
1205  */
1206 static int smack_inode_rename(struct inode *old_inode,
1207                               struct dentry *old_dentry,
1208                               struct inode *new_inode,
1209                               struct dentry *new_dentry)
1210 {
1211         int rc;
1212         struct smack_known *isp;
1213         struct smk_audit_info ad;
1214 
1215         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1216         smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
1217 
1218         isp = smk_of_inode(d_backing_inode(old_dentry));
1219         rc = smk_curacc(isp, MAY_READWRITE, &ad);
1220         rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_READWRITE, rc);
1221 
1222         if (rc == 0 && d_is_positive(new_dentry)) {
1223                 isp = smk_of_inode(d_backing_inode(new_dentry));
1224                 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
1225                 rc = smk_curacc(isp, MAY_READWRITE, &ad);
1226                 rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_READWRITE, rc);
1227         }
1228         return rc;
1229 }
1230 
1231 /**
1232  * smack_inode_permission - Smack version of permission()
1233  * @inode: the inode in question
1234  * @mask: the access requested
1235  *
1236  * This is the important Smack hook.
1237  *
1238  * Returns 0 if access is permitted, -EACCES otherwise
1239  */
1240 static int smack_inode_permission(struct inode *inode, int mask)
1241 {
1242         struct superblock_smack *sbsp = inode->i_sb->s_security;
1243         struct smk_audit_info ad;
1244         int no_block = mask & MAY_NOT_BLOCK;
1245         int rc;
1246 
1247         mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND);
1248         /*
1249          * No permission to check. Existence test. Yup, it's there.
1250          */
1251         if (mask == 0)
1252                 return 0;
1253 
1254         if (sbsp->smk_flags & SMK_SB_UNTRUSTED) {
1255                 if (smk_of_inode(inode) != sbsp->smk_root)
1256                         return -EACCES;
1257         }
1258 
1259         /* May be droppable after audit */
1260         if (no_block)
1261                 return -ECHILD;
1262         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
1263         smk_ad_setfield_u_fs_inode(&ad, inode);
1264         rc = smk_curacc(smk_of_inode(inode), mask, &ad);
1265         rc = smk_bu_inode(inode, mask, rc);
1266         return rc;
1267 }
1268 
1269 /**
1270  * smack_inode_setattr - Smack check for setting attributes
1271  * @dentry: the object
1272  * @iattr: for the force flag
1273  *
1274  * Returns 0 if access is permitted, an error code otherwise
1275  */
1276 static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr)
1277 {
1278         struct smk_audit_info ad;
1279         int rc;
1280 
1281         /*
1282          * Need to allow for clearing the setuid bit.
1283          */
1284         if (iattr->ia_valid & ATTR_FORCE)
1285                 return 0;
1286         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1287         smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1288 
1289         rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1290         rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
1291         return rc;
1292 }
1293 
1294 /**
1295  * smack_inode_getattr - Smack check for getting attributes
1296  * @mnt: vfsmount of the object
1297  * @dentry: the object
1298  *
1299  * Returns 0 if access is permitted, an error code otherwise
1300  */
1301 static int smack_inode_getattr(const struct path *path)
1302 {
1303         struct smk_audit_info ad;
1304         struct inode *inode = d_backing_inode(path->dentry);
1305         int rc;
1306 
1307         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1308         smk_ad_setfield_u_fs_path(&ad, *path);
1309         rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad);
1310         rc = smk_bu_inode(inode, MAY_READ, rc);
1311         return rc;
1312 }
1313 
1314 /**
1315  * smack_inode_setxattr - Smack check for setting xattrs
1316  * @dentry: the object
1317  * @name: name of the attribute
1318  * @value: value of the attribute
1319  * @size: size of the value
1320  * @flags: unused
1321  *
1322  * This protects the Smack attribute explicitly.
1323  *
1324  * Returns 0 if access is permitted, an error code otherwise
1325  */
1326 static int smack_inode_setxattr(struct dentry *dentry, const char *name,
1327                                 const void *value, size_t size, int flags)
1328 {
1329         struct smk_audit_info ad;
1330         struct smack_known *skp;
1331         int check_priv = 0;
1332         int check_import = 0;
1333         int check_star = 0;
1334         int rc = 0;
1335 
1336         /*
1337          * Check label validity here so import won't fail in post_setxattr
1338          */
1339         if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
1340             strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
1341             strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) {
1342                 check_priv = 1;
1343                 check_import = 1;
1344         } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
1345                    strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
1346                 check_priv = 1;
1347                 check_import = 1;
1348                 check_star = 1;
1349         } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
1350                 check_priv = 1;
1351                 if (size != TRANS_TRUE_SIZE ||
1352                     strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0)
1353                         rc = -EINVAL;
1354         } else
1355                 rc = cap_inode_setxattr(dentry, name, value, size, flags);
1356 
1357         if (check_priv && !smack_privileged(CAP_MAC_ADMIN))
1358                 rc = -EPERM;
1359 
1360         if (rc == 0 && check_import) {
1361                 skp = size ? smk_import_entry(value, size) : NULL;
1362                 if (IS_ERR(skp))
1363                         rc = PTR_ERR(skp);
1364                 else if (skp == NULL || (check_star &&
1365                     (skp == &smack_known_star || skp == &smack_known_web)))
1366                         rc = -EINVAL;
1367         }
1368 
1369         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1370         smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1371 
1372         if (rc == 0) {
1373                 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1374                 rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
1375         }
1376 
1377         return rc;
1378 }
1379 
1380 /**
1381  * smack_inode_post_setxattr - Apply the Smack update approved above
1382  * @dentry: object
1383  * @name: attribute name
1384  * @value: attribute value
1385  * @size: attribute size
1386  * @flags: unused
1387  *
1388  * Set the pointer in the inode blob to the entry found
1389  * in the master label list.
1390  */
1391 static void smack_inode_post_setxattr(struct dentry *dentry, const char *name,
1392                                       const void *value, size_t size, int flags)
1393 {
1394         struct smack_known *skp;
1395         struct inode_smack *isp = d_backing_inode(dentry)->i_security;
1396 
1397         if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
1398                 isp->smk_flags |= SMK_INODE_TRANSMUTE;
1399                 return;
1400         }
1401 
1402         if (strcmp(name, XATTR_NAME_SMACK) == 0) {
1403                 skp = smk_import_entry(value, size);
1404                 if (!IS_ERR(skp))
1405                         isp->smk_inode = skp;
1406         } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) {
1407                 skp = smk_import_entry(value, size);
1408                 if (!IS_ERR(skp))
1409                         isp->smk_task = skp;
1410         } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
1411                 skp = smk_import_entry(value, size);
1412                 if (!IS_ERR(skp))
1413                         isp->smk_mmap = skp;
1414         }
1415 
1416         return;
1417 }
1418 
1419 /**
1420  * smack_inode_getxattr - Smack check on getxattr
1421  * @dentry: the object
1422  * @name: unused
1423  *
1424  * Returns 0 if access is permitted, an error code otherwise
1425  */
1426 static int smack_inode_getxattr(struct dentry *dentry, const char *name)
1427 {
1428         struct smk_audit_info ad;
1429         int rc;
1430 
1431         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1432         smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1433 
1434         rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_READ, &ad);
1435         rc = smk_bu_inode(d_backing_inode(dentry), MAY_READ, rc);
1436         return rc;
1437 }
1438 
1439 /**
1440  * smack_inode_removexattr - Smack check on removexattr
1441  * @dentry: the object
1442  * @name: name of the attribute
1443  *
1444  * Removing the Smack attribute requires CAP_MAC_ADMIN
1445  *
1446  * Returns 0 if access is permitted, an error code otherwise
1447  */
1448 static int smack_inode_removexattr(struct dentry *dentry, const char *name)
1449 {
1450         struct inode_smack *isp;
1451         struct smk_audit_info ad;
1452         int rc = 0;
1453 
1454         if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
1455             strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
1456             strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
1457             strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
1458             strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 ||
1459             strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
1460                 if (!smack_privileged(CAP_MAC_ADMIN))
1461                         rc = -EPERM;
1462         } else
1463                 rc = cap_inode_removexattr(dentry, name);
1464 
1465         if (rc != 0)
1466                 return rc;
1467 
1468         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1469         smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1470 
1471         rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1472         rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
1473         if (rc != 0)
1474                 return rc;
1475 
1476         isp = d_backing_inode(dentry)->i_security;
1477         /*
1478          * Don't do anything special for these.
1479          *      XATTR_NAME_SMACKIPIN
1480          *      XATTR_NAME_SMACKIPOUT
1481          */
1482         if (strcmp(name, XATTR_NAME_SMACK) == 0) {
1483                 struct super_block *sbp = dentry->d_sb;
1484                 struct superblock_smack *sbsp = sbp->s_security;
1485 
1486                 isp->smk_inode = sbsp->smk_default;
1487         } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0)
1488                 isp->smk_task = NULL;
1489         else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0)
1490                 isp->smk_mmap = NULL;
1491         else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0)
1492                 isp->smk_flags &= ~SMK_INODE_TRANSMUTE;
1493 
1494         return 0;
1495 }
1496 
1497 /**
1498  * smack_inode_getsecurity - get smack xattrs
1499  * @inode: the object
1500  * @name: attribute name
1501  * @buffer: where to put the result
1502  * @alloc: duplicate memory
1503  *
1504  * Returns the size of the attribute or an error code
1505  */
1506 static int smack_inode_getsecurity(struct inode *inode,
1507                                    const char *name, void **buffer,
1508                                    bool alloc)
1509 {
1510         struct socket_smack *ssp;
1511         struct socket *sock;
1512         struct super_block *sbp;
1513         struct inode *ip = (struct inode *)inode;
1514         struct smack_known *isp;
1515 
1516         if (strcmp(name, XATTR_SMACK_SUFFIX) == 0)
1517                 isp = smk_of_inode(inode);
1518         else {
1519                 /*
1520                  * The rest of the Smack xattrs are only on sockets.
1521                  */
1522                 sbp = ip->i_sb;
1523                 if (sbp->s_magic != SOCKFS_MAGIC)
1524                         return -EOPNOTSUPP;
1525 
1526                 sock = SOCKET_I(ip);
1527                 if (sock == NULL || sock->sk == NULL)
1528                         return -EOPNOTSUPP;
1529 
1530                 ssp = sock->sk->sk_security;
1531 
1532                 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
1533                         isp = ssp->smk_in;
1534                 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0)
1535                         isp = ssp->smk_out;
1536                 else
1537                         return -EOPNOTSUPP;
1538         }
1539 
1540         if (alloc) {
1541                 *buffer = kstrdup(isp->smk_known, GFP_KERNEL);
1542                 if (*buffer == NULL)
1543                         return -ENOMEM;
1544         }
1545 
1546         return strlen(isp->smk_known);
1547 }
1548 
1549 
1550 /**
1551  * smack_inode_listsecurity - list the Smack attributes
1552  * @inode: the object
1553  * @buffer: where they go
1554  * @buffer_size: size of buffer
1555  */
1556 static int smack_inode_listsecurity(struct inode *inode, char *buffer,
1557                                     size_t buffer_size)
1558 {
1559         int len = sizeof(XATTR_NAME_SMACK);
1560 
1561         if (buffer != NULL && len <= buffer_size)
1562                 memcpy(buffer, XATTR_NAME_SMACK, len);
1563 
1564         return len;
1565 }
1566 
1567 /**
1568  * smack_inode_getsecid - Extract inode's security id
1569  * @inode: inode to extract the info from
1570  * @secid: where result will be saved
1571  */
1572 static void smack_inode_getsecid(struct inode *inode, u32 *secid)
1573 {
1574         struct inode_smack *isp = inode->i_security;
1575 
1576         *secid = isp->smk_inode->smk_secid;
1577 }
1578 
1579 /*
1580  * File Hooks
1581  */
1582 
1583 /*
1584  * There is no smack_file_permission hook
1585  *
1586  * Should access checks be done on each read or write?
1587  * UNICOS and SELinux say yes.
1588  * Trusted Solaris, Trusted Irix, and just about everyone else says no.
1589  *
1590  * I'll say no for now. Smack does not do the frequent
1591  * label changing that SELinux does.
1592  */
1593 
1594 /**
1595  * smack_file_alloc_security - assign a file security blob
1596  * @file: the object
1597  *
1598  * The security blob for a file is a pointer to the master
1599  * label list, so no allocation is done.
1600  *
1601  * f_security is the owner security information. It
1602  * isn't used on file access checks, it's for send_sigio.
1603  *
1604  * Returns 0
1605  */
1606 static int smack_file_alloc_security(struct file *file)
1607 {
1608         struct smack_known *skp = smk_of_current();
1609 
1610         file->f_security = skp;
1611         return 0;
1612 }
1613 
1614 /**
1615  * smack_file_free_security - clear a file security blob
1616  * @file: the object
1617  *
1618  * The security blob for a file is a pointer to the master
1619  * label list, so no memory is freed.
1620  */
1621 static void smack_file_free_security(struct file *file)
1622 {
1623         file->f_security = NULL;
1624 }
1625 
1626 /**
1627  * smack_file_ioctl - Smack check on ioctls
1628  * @file: the object
1629  * @cmd: what to do
1630  * @arg: unused
1631  *
1632  * Relies heavily on the correct use of the ioctl command conventions.
1633  *
1634  * Returns 0 if allowed, error code otherwise
1635  */
1636 static int smack_file_ioctl(struct file *file, unsigned int cmd,
1637                             unsigned long arg)
1638 {
1639         int rc = 0;
1640         struct smk_audit_info ad;
1641         struct inode *inode = file_inode(file);
1642 
1643         if (unlikely(IS_PRIVATE(inode)))
1644                 return 0;
1645 
1646         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1647         smk_ad_setfield_u_fs_path(&ad, file->f_path);
1648 
1649         if (_IOC_DIR(cmd) & _IOC_WRITE) {
1650                 rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad);
1651                 rc = smk_bu_file(file, MAY_WRITE, rc);
1652         }
1653 
1654         if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) {
1655                 rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad);
1656                 rc = smk_bu_file(file, MAY_READ, rc);
1657         }
1658 
1659         return rc;
1660 }
1661 
1662 /**
1663  * smack_file_lock - Smack check on file locking
1664  * @file: the object
1665  * @cmd: unused
1666  *
1667  * Returns 0 if current has lock access, error code otherwise
1668  */
1669 static int smack_file_lock(struct file *file, unsigned int cmd)
1670 {
1671         struct smk_audit_info ad;
1672         int rc;
1673         struct inode *inode = file_inode(file);
1674 
1675         if (unlikely(IS_PRIVATE(inode)))
1676                 return 0;
1677 
1678         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1679         smk_ad_setfield_u_fs_path(&ad, file->f_path);
1680         rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad);
1681         rc = smk_bu_file(file, MAY_LOCK, rc);
1682         return rc;
1683 }
1684 
1685 /**
1686  * smack_file_fcntl - Smack check on fcntl
1687  * @file: the object
1688  * @cmd: what action to check
1689  * @arg: unused
1690  *
1691  * Generally these operations are harmless.
1692  * File locking operations present an obvious mechanism
1693  * for passing information, so they require write access.
1694  *
1695  * Returns 0 if current has access, error code otherwise
1696  */
1697 static int smack_file_fcntl(struct file *file, unsigned int cmd,
1698                             unsigned long arg)
1699 {
1700         struct smk_audit_info ad;
1701         int rc = 0;
1702         struct inode *inode = file_inode(file);
1703 
1704         if (unlikely(IS_PRIVATE(inode)))
1705                 return 0;
1706 
1707         switch (cmd) {
1708         case F_GETLK:
1709                 break;
1710         case F_SETLK:
1711         case F_SETLKW:
1712                 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1713                 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1714                 rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad);
1715                 rc = smk_bu_file(file, MAY_LOCK, rc);
1716                 break;
1717         case F_SETOWN:
1718         case F_SETSIG:
1719                 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1720                 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1721                 rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad);
1722                 rc = smk_bu_file(file, MAY_WRITE, rc);
1723                 break;
1724         default:
1725                 break;
1726         }
1727 
1728         return rc;
1729 }
1730 
1731 /**
1732  * smack_mmap_file :
1733  * Check permissions for a mmap operation.  The @file may be NULL, e.g.
1734  * if mapping anonymous memory.
1735  * @file contains the file structure for file to map (may be NULL).
1736  * @reqprot contains the protection requested by the application.
1737  * @prot contains the protection that will be applied by the kernel.
1738  * @flags contains the operational flags.
1739  * Return 0 if permission is granted.
1740  */
1741 static int smack_mmap_file(struct file *file,
1742                            unsigned long reqprot, unsigned long prot,
1743                            unsigned long flags)
1744 {
1745         struct smack_known *skp;
1746         struct smack_known *mkp;
1747         struct smack_rule *srp;
1748         struct task_smack *tsp;
1749         struct smack_known *okp;
1750         struct inode_smack *isp;
1751         struct superblock_smack *sbsp;
1752         int may;
1753         int mmay;
1754         int tmay;
1755         int rc;
1756 
1757         if (file == NULL)
1758                 return 0;
1759 
1760         if (unlikely(IS_PRIVATE(file_inode(file))))
1761                 return 0;
1762 
1763         isp = file_inode(file)->i_security;
1764         if (isp->smk_mmap == NULL)
1765                 return 0;
1766         sbsp = file_inode(file)->i_sb->s_security;
1767         if (sbsp->smk_flags & SMK_SB_UNTRUSTED &&
1768             isp->smk_mmap != sbsp->smk_root)
1769                 return -EACCES;
1770         mkp = isp->smk_mmap;
1771 
1772         tsp = current_security();
1773         skp = smk_of_current();
1774         rc = 0;
1775 
1776         rcu_read_lock();
1777         /*
1778          * For each Smack rule associated with the subject
1779          * label verify that the SMACK64MMAP also has access
1780          * to that rule's object label.
1781          */
1782         list_for_each_entry_rcu(srp, &skp->smk_rules, list) {
1783                 okp = srp->smk_object;
1784                 /*
1785                  * Matching labels always allows access.
1786                  */
1787                 if (mkp->smk_known == okp->smk_known)
1788                         continue;
1789                 /*
1790                  * If there is a matching local rule take
1791                  * that into account as well.
1792                  */
1793                 may = smk_access_entry(srp->smk_subject->smk_known,
1794                                        okp->smk_known,
1795                                        &tsp->smk_rules);
1796                 if (may == -ENOENT)
1797                         may = srp->smk_access;
1798                 else
1799                         may &= srp->smk_access;
1800                 /*
1801                  * If may is zero the SMACK64MMAP subject can't
1802                  * possibly have less access.
1803                  */
1804                 if (may == 0)
1805                         continue;
1806 
1807                 /*
1808                  * Fetch the global list entry.
1809                  * If there isn't one a SMACK64MMAP subject
1810                  * can't have as much access as current.
1811                  */
1812                 mmay = smk_access_entry(mkp->smk_known, okp->smk_known,
1813                                         &mkp->smk_rules);
1814                 if (mmay == -ENOENT) {
1815                         rc = -EACCES;
1816                         break;
1817                 }
1818                 /*
1819                  * If there is a local entry it modifies the
1820                  * potential access, too.
1821                  */
1822                 tmay = smk_access_entry(mkp->smk_known, okp->smk_known,
1823                                         &tsp->smk_rules);
1824                 if (tmay != -ENOENT)
1825                         mmay &= tmay;
1826 
1827                 /*
1828                  * If there is any access available to current that is
1829                  * not available to a SMACK64MMAP subject
1830                  * deny access.
1831                  */
1832                 if ((may | mmay) != mmay) {
1833                         rc = -EACCES;
1834                         break;
1835                 }
1836         }
1837 
1838         rcu_read_unlock();
1839 
1840         return rc;
1841 }
1842 
1843 /**
1844  * smack_file_set_fowner - set the file security blob value
1845  * @file: object in question
1846  *
1847  */
1848 static void smack_file_set_fowner(struct file *file)
1849 {
1850         file->f_security = smk_of_current();
1851 }
1852 
1853 /**
1854  * smack_file_send_sigiotask - Smack on sigio
1855  * @tsk: The target task
1856  * @fown: the object the signal come from
1857  * @signum: unused
1858  *
1859  * Allow a privileged task to get signals even if it shouldn't
1860  *
1861  * Returns 0 if a subject with the object's smack could
1862  * write to the task, an error code otherwise.
1863  */
1864 static int smack_file_send_sigiotask(struct task_struct *tsk,
1865                                      struct fown_struct *fown, int signum)
1866 {
1867         struct smack_known *skp;
1868         struct smack_known *tkp = smk_of_task(tsk->cred->security);
1869         struct file *file;
1870         int rc;
1871         struct smk_audit_info ad;
1872 
1873         /*
1874          * struct fown_struct is never outside the context of a struct file
1875          */
1876         file = container_of(fown, struct file, f_owner);
1877 
1878         /* we don't log here as rc can be overriden */
1879         skp = file->f_security;
1880         rc = smk_access(skp, tkp, MAY_DELIVER, NULL);
1881         rc = smk_bu_note("sigiotask", skp, tkp, MAY_DELIVER, rc);
1882         if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE))
1883                 rc = 0;
1884 
1885         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1886         smk_ad_setfield_u_tsk(&ad, tsk);
1887         smack_log(skp->smk_known, tkp->smk_known, MAY_DELIVER, rc, &ad);
1888         return rc;
1889 }
1890 
1891 /**
1892  * smack_file_receive - Smack file receive check
1893  * @file: the object
1894  *
1895  * Returns 0 if current has access, error code otherwise
1896  */
1897 static int smack_file_receive(struct file *file)
1898 {
1899         int rc;
1900         int may = 0;
1901         struct smk_audit_info ad;
1902         struct inode *inode = file_inode(file);
1903         struct socket *sock;
1904         struct task_smack *tsp;
1905         struct socket_smack *ssp;
1906 
1907         if (unlikely(IS_PRIVATE(inode)))
1908                 return 0;
1909 
1910         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1911         smk_ad_setfield_u_fs_path(&ad, file->f_path);
1912 
1913         if (inode->i_sb->s_magic == SOCKFS_MAGIC) {
1914                 sock = SOCKET_I(inode);
1915                 ssp = sock->sk->sk_security;
1916                 tsp = current_security();
1917                 /*
1918                  * If the receiving process can't write to the
1919                  * passed socket or if the passed socket can't
1920                  * write to the receiving process don't accept
1921                  * the passed socket.
1922                  */
1923                 rc = smk_access(tsp->smk_task, ssp->smk_out, MAY_WRITE, &ad);
1924                 rc = smk_bu_file(file, may, rc);
1925                 if (rc < 0)
1926                         return rc;
1927                 rc = smk_access(ssp->smk_in, tsp->smk_task, MAY_WRITE, &ad);
1928                 rc = smk_bu_file(file, may, rc);
1929                 return rc;
1930         }
1931         /*
1932          * This code relies on bitmasks.
1933          */
1934         if (file->f_mode & FMODE_READ)
1935                 may = MAY_READ;
1936         if (file->f_mode & FMODE_WRITE)
1937                 may |= MAY_WRITE;
1938 
1939         rc = smk_curacc(smk_of_inode(inode), may, &ad);
1940         rc = smk_bu_file(file, may, rc);
1941         return rc;
1942 }
1943 
1944 /**
1945  * smack_file_open - Smack dentry open processing
1946  * @file: the object
1947  * @cred: task credential
1948  *
1949  * Set the security blob in the file structure.
1950  * Allow the open only if the task has read access. There are
1951  * many read operations (e.g. fstat) that you can do with an
1952  * fd even if you have the file open write-only.
1953  *
1954  * Returns 0
1955  */
1956 static int smack_file_open(struct file *file, const struct cred *cred)
1957 {
1958         struct task_smack *tsp = cred->security;
1959         struct inode *inode = file_inode(file);
1960         struct smk_audit_info ad;
1961         int rc;
1962 
1963         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1964         smk_ad_setfield_u_fs_path(&ad, file->f_path);
1965         rc = smk_tskacc(tsp, smk_of_inode(inode), MAY_READ, &ad);
1966         rc = smk_bu_credfile(cred, file, MAY_READ, rc);
1967 
1968         return rc;
1969 }
1970 
1971 /*
1972  * Task hooks
1973  */
1974 
1975 /**
1976  * smack_cred_alloc_blank - "allocate" blank task-level security credentials
1977  * @new: the new credentials
1978  * @gfp: the atomicity of any memory allocations
1979  *
1980  * Prepare a blank set of credentials for modification.  This must allocate all
1981  * the memory the LSM module might require such that cred_transfer() can
1982  * complete without error.
1983  */
1984 static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp)
1985 {
1986         struct task_smack *tsp;
1987 
1988         tsp = new_task_smack(NULL, NULL, gfp);
1989         if (tsp == NULL)
1990                 return -ENOMEM;
1991 
1992         cred->security = tsp;
1993 
1994         return 0;
1995 }
1996 
1997 
1998 /**
1999  * smack_cred_free - "free" task-level security credentials
2000  * @cred: the credentials in question
2001  *
2002  */
2003 static void smack_cred_free(struct cred *cred)
2004 {
2005         struct task_smack *tsp = cred->security;
2006         struct smack_rule *rp;
2007         struct list_head *l;
2008         struct list_head *n;
2009 
2010         if (tsp == NULL)
2011                 return;
2012         cred->security = NULL;
2013 
2014         smk_destroy_label_list(&tsp->smk_relabel);
2015 
2016         list_for_each_safe(l, n, &tsp->smk_rules) {
2017                 rp = list_entry(l, struct smack_rule, list);
2018                 list_del(&rp->list);
2019                 kfree(rp);
2020         }
2021         kfree(tsp);
2022 }
2023 
2024 /**
2025  * smack_cred_prepare - prepare new set of credentials for modification
2026  * @new: the new credentials
2027  * @old: the original credentials
2028  * @gfp: the atomicity of any memory allocations
2029  *
2030  * Prepare a new set of credentials for modification.
2031  */
2032 static int smack_cred_prepare(struct cred *new, const struct cred *old,
2033                               gfp_t gfp)
2034 {
2035         struct task_smack *old_tsp = old->security;
2036         struct task_smack *new_tsp;
2037         int rc;
2038 
2039         new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp);
2040         if (new_tsp == NULL)
2041                 return -ENOMEM;
2042 
2043         new->security = new_tsp;
2044 
2045         rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp);
2046         if (rc != 0)
2047                 return rc;
2048 
2049         rc = smk_copy_relabel(&new_tsp->smk_relabel, &old_tsp->smk_relabel,
2050                                 gfp);
2051         if (rc != 0)
2052                 return rc;
2053 
2054         return 0;
2055 }
2056 
2057 /**
2058  * smack_cred_transfer - Transfer the old credentials to the new credentials
2059  * @new: the new credentials
2060  * @old: the original credentials
2061  *
2062  * Fill in a set of blank credentials from another set of credentials.
2063  */
2064 static void smack_cred_transfer(struct cred *new, const struct cred *old)
2065 {
2066         struct task_smack *old_tsp = old->security;
2067         struct task_smack *new_tsp = new->security;
2068 
2069         new_tsp->smk_task = old_tsp->smk_task;
2070         new_tsp->smk_forked = old_tsp->smk_task;
2071         mutex_init(&new_tsp->smk_rules_lock);
2072         INIT_LIST_HEAD(&new_tsp->smk_rules);
2073 
2074 
2075         /* cbs copy rule list */
2076 }
2077 
2078 /**
2079  * smack_kernel_act_as - Set the subjective context in a set of credentials
2080  * @new: points to the set of credentials to be modified.
2081  * @secid: specifies the security ID to be set
2082  *
2083  * Set the security data for a kernel service.
2084  */
2085 static int smack_kernel_act_as(struct cred *new, u32 secid)
2086 {
2087         struct task_smack *new_tsp = new->security;
2088 
2089         new_tsp->smk_task = smack_from_secid(secid);
2090         return 0;
2091 }
2092 
2093 /**
2094  * smack_kernel_create_files_as - Set the file creation label in a set of creds
2095  * @new: points to the set of credentials to be modified
2096  * @inode: points to the inode to use as a reference
2097  *
2098  * Set the file creation context in a set of credentials to the same
2099  * as the objective context of the specified inode
2100  */
2101 static int smack_kernel_create_files_as(struct cred *new,
2102                                         struct inode *inode)
2103 {
2104         struct inode_smack *isp = inode->i_security;
2105         struct task_smack *tsp = new->security;
2106 
2107         tsp->smk_forked = isp->smk_inode;
2108         tsp->smk_task = tsp->smk_forked;
2109         return 0;
2110 }
2111 
2112 /**
2113  * smk_curacc_on_task - helper to log task related access
2114  * @p: the task object
2115  * @access: the access requested
2116  * @caller: name of the calling function for audit
2117  *
2118  * Return 0 if access is permitted
2119  */
2120 static int smk_curacc_on_task(struct task_struct *p, int access,
2121                                 const char *caller)
2122 {
2123         struct smk_audit_info ad;
2124         struct smack_known *skp = smk_of_task_struct(p);
2125         int rc;
2126 
2127         smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK);
2128         smk_ad_setfield_u_tsk(&ad, p);
2129         rc = smk_curacc(skp, access, &ad);
2130         rc = smk_bu_task(p, access, rc);
2131         return rc;
2132 }
2133 
2134 /**
2135  * smack_task_setpgid - Smack check on setting pgid
2136  * @p: the task object
2137  * @pgid: unused
2138  *
2139  * Return 0 if write access is permitted
2140  */
2141 static int smack_task_setpgid(struct task_struct *p, pid_t pgid)
2142 {
2143         return smk_curacc_on_task(p, MAY_WRITE, __func__);
2144 }
2145 
2146 /**
2147  * smack_task_getpgid - Smack access check for getpgid
2148  * @p: the object task
2149  *
2150  * Returns 0 if current can read the object task, error code otherwise
2151  */
2152 static int smack_task_getpgid(struct task_struct *p)
2153 {
2154         return smk_curacc_on_task(p, MAY_READ, __func__);
2155 }
2156 
2157 /**
2158  * smack_task_getsid - Smack access check for getsid
2159  * @p: the object task
2160  *
2161  * Returns 0 if current can read the object task, error code otherwise
2162  */
2163 static int smack_task_getsid(struct task_struct *p)
2164 {
2165         return smk_curacc_on_task(p, MAY_READ, __func__);
2166 }
2167 
2168 /**
2169  * smack_task_getsecid - get the secid of the task
2170  * @p: the object task
2171  * @secid: where to put the result
2172  *
2173  * Sets the secid to contain a u32 version of the smack label.
2174  */
2175 static void smack_task_getsecid(struct task_struct *p, u32 *secid)
2176 {
2177         struct smack_known *skp = smk_of_task_struct(p);
2178 
2179         *secid = skp->smk_secid;
2180 }
2181 
2182 /**
2183  * smack_task_setnice - Smack check on setting nice
2184  * @p: the task object
2185  * @nice: unused
2186  *
2187  * Return 0 if write access is permitted
2188  */
2189 static int smack_task_setnice(struct task_struct *p, int nice)
2190 {
2191         return smk_curacc_on_task(p, MAY_WRITE, __func__);
2192 }
2193 
2194 /**
2195  * smack_task_setioprio - Smack check on setting ioprio
2196  * @p: the task object
2197  * @ioprio: unused
2198  *
2199  * Return 0 if write access is permitted
2200  */
2201 static int smack_task_setioprio(struct task_struct *p, int ioprio)
2202 {
2203         return smk_curacc_on_task(p, MAY_WRITE, __func__);
2204 }
2205 
2206 /**
2207  * smack_task_getioprio - Smack check on reading ioprio
2208  * @p: the task object
2209  *
2210  * Return 0 if read access is permitted
2211  */
2212 static int smack_task_getioprio(struct task_struct *p)
2213 {
2214         return smk_curacc_on_task(p, MAY_READ, __func__);
2215 }
2216 
2217 /**
2218  * smack_task_setscheduler - Smack check on setting scheduler
2219  * @p: the task object
2220  * @policy: unused
2221  * @lp: unused
2222  *
2223  * Return 0 if read access is permitted
2224  */
2225 static int smack_task_setscheduler(struct task_struct *p)
2226 {
2227         return smk_curacc_on_task(p, MAY_WRITE, __func__);
2228 }
2229 
2230 /**
2231  * smack_task_getscheduler - Smack check on reading scheduler
2232  * @p: the task object
2233  *
2234  * Return 0 if read access is permitted
2235  */
2236 static int smack_task_getscheduler(struct task_struct *p)
2237 {
2238         return smk_curacc_on_task(p, MAY_READ, __func__);
2239 }
2240 
2241 /**
2242  * smack_task_movememory - Smack check on moving memory
2243  * @p: the task object
2244  *
2245  * Return 0 if write access is permitted
2246  */
2247 static int smack_task_movememory(struct task_struct *p)
2248 {
2249         return smk_curacc_on_task(p, MAY_WRITE, __func__);
2250 }
2251 
2252 /**
2253  * smack_task_kill - Smack check on signal delivery
2254  * @p: the task object
2255  * @info: unused
2256  * @sig: unused
2257  * @secid: identifies the smack to use in lieu of current's
2258  *
2259  * Return 0 if write access is permitted
2260  *
2261  * The secid behavior is an artifact of an SELinux hack
2262  * in the USB code. Someday it may go away.
2263  */
2264 static int smack_task_kill(struct task_struct *p, struct siginfo *info,
2265                            int sig, u32 secid)
2266 {
2267         struct smk_audit_info ad;
2268         struct smack_known *skp;
2269         struct smack_known *tkp = smk_of_task_struct(p);
2270         int rc;
2271 
2272         if (!sig)
2273                 return 0; /* null signal; existence test */
2274 
2275         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
2276         smk_ad_setfield_u_tsk(&ad, p);
2277         /*
2278          * Sending a signal requires that the sender
2279          * can write the receiver.
2280          */
2281         if (secid == 0) {
2282                 rc = smk_curacc(tkp, MAY_DELIVER, &ad);
2283                 rc = smk_bu_task(p, MAY_DELIVER, rc);
2284                 return rc;
2285         }
2286         /*
2287          * If the secid isn't 0 we're dealing with some USB IO
2288          * specific behavior. This is not clean. For one thing
2289          * we can't take privilege into account.
2290          */
2291         skp = smack_from_secid(secid);
2292         rc = smk_access(skp, tkp, MAY_DELIVER, &ad);
2293         rc = smk_bu_note("USB signal", skp, tkp, MAY_DELIVER, rc);
2294         return rc;
2295 }
2296 
2297 /**
2298  * smack_task_to_inode - copy task smack into the inode blob
2299  * @p: task to copy from
2300  * @inode: inode to copy to
2301  *
2302  * Sets the smack pointer in the inode security blob
2303  */
2304 static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
2305 {
2306         struct inode_smack *isp = inode->i_security;
2307         struct smack_known *skp = smk_of_task_struct(p);
2308 
2309         isp->smk_inode = skp;
2310 }
2311 
2312 /*
2313  * Socket hooks.
2314  */
2315 
2316 /**
2317  * smack_sk_alloc_security - Allocate a socket blob
2318  * @sk: the socket
2319  * @family: unused
2320  * @gfp_flags: memory allocation flags
2321  *
2322  * Assign Smack pointers to current
2323  *
2324  * Returns 0 on success, -ENOMEM is there's no memory
2325  */
2326 static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
2327 {
2328         struct smack_known *skp = smk_of_current();
2329         struct socket_smack *ssp;
2330 
2331         ssp = kzalloc(sizeof(struct socket_smack), gfp_flags);
2332         if (ssp == NULL)
2333                 return -ENOMEM;
2334 
2335         /*
2336          * Sockets created by kernel threads receive web label.
2337          */
2338         if (unlikely(current->flags & PF_KTHREAD)) {
2339                 ssp->smk_in = &smack_known_web;
2340                 ssp->smk_out = &smack_known_web;
2341         } else {
2342                 ssp->smk_in = skp;
2343                 ssp->smk_out = skp;
2344         }
2345         ssp->smk_packet = NULL;
2346 
2347         sk->sk_security = ssp;
2348 
2349         return 0;
2350 }
2351 
2352 /**
2353  * smack_sk_free_security - Free a socket blob
2354  * @sk: the socket
2355  *
2356  * Clears the blob pointer
2357  */
2358 static void smack_sk_free_security(struct sock *sk)
2359 {
2360 #ifdef SMACK_IPV6_PORT_LABELING
2361         struct smk_port_label *spp;
2362 
2363         if (sk->sk_family == PF_INET6) {
2364                 rcu_read_lock();
2365                 list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) {
2366                         if (spp->smk_sock != sk)
2367                                 continue;
2368                         spp->smk_can_reuse = 1;
2369                         break;
2370                 }
2371                 rcu_read_unlock();
2372         }
2373 #endif
2374         kfree(sk->sk_security);
2375 }
2376 
2377 /**
2378 * smack_ipv4host_label - check host based restrictions
2379 * @sip: the object end
2380 *
2381 * looks for host based access restrictions
2382 *
2383 * This version will only be appropriate for really small sets of single label
2384 * hosts.  The caller is responsible for ensuring that the RCU read lock is
2385 * taken before calling this function.
2386 *
2387 * Returns the label of the far end or NULL if it's not special.
2388 */
2389 static struct smack_known *smack_ipv4host_label(struct sockaddr_in *sip)
2390 {
2391         struct smk_net4addr *snp;
2392         struct in_addr *siap = &sip->sin_addr;
2393 
2394         if (siap->s_addr == 0)
2395                 return NULL;
2396 
2397         list_for_each_entry_rcu(snp, &smk_net4addr_list, list)
2398                 /*
2399                  * we break after finding the first match because
2400                  * the list is sorted from longest to shortest mask
2401                  * so we have found the most specific match
2402                  */
2403                 if (snp->smk_host.s_addr ==
2404                     (siap->s_addr & snp->smk_mask.s_addr))
2405                         return snp->smk_label;
2406 
2407         return NULL;
2408 }
2409 
2410 #if IS_ENABLED(CONFIG_IPV6)
2411 /*
2412  * smk_ipv6_localhost - Check for local ipv6 host address
2413  * @sip: the address
2414  *
2415  * Returns boolean true if this is the localhost address
2416  */
2417 static bool smk_ipv6_localhost(struct sockaddr_in6 *sip)
2418 {
2419         __be16 *be16p = (__be16 *)&sip->sin6_addr;
2420         __be32 *be32p = (__be32 *)&sip->sin6_addr;
2421 
2422         if (be32p[0] == 0 && be32p[1] == 0 && be32p[2] == 0 && be16p[6] == 0 &&
2423             ntohs(be16p[7]) == 1)
2424                 return true;
2425         return false;
2426 }
2427 
2428 /**
2429 * smack_ipv6host_label - check host based restrictions
2430 * @sip: the object end
2431 *
2432 * looks for host based access restrictions
2433 *
2434 * This version will only be appropriate for really small sets of single label
2435 * hosts.  The caller is responsible for ensuring that the RCU read lock is
2436 * taken before calling this function.
2437 *
2438 * Returns the label of the far end or NULL if it's not special.
2439 */
2440 static struct smack_known *smack_ipv6host_label(struct sockaddr_in6 *sip)
2441 {
2442         struct smk_net6addr *snp;
2443         struct in6_addr *sap = &sip->sin6_addr;
2444         int i;
2445         int found = 0;
2446 
2447         /*
2448          * It's local. Don't look for a host label.
2449          */
2450         if (smk_ipv6_localhost(sip))
2451                 return NULL;
2452 
2453         list_for_each_entry_rcu(snp, &smk_net6addr_list, list) {
2454                 /*
2455                  * If the label is NULL the entry has
2456                  * been renounced. Ignore it.
2457                  */
2458                 if (snp->smk_label == NULL)
2459                         continue;
2460                 /*
2461                 * we break after finding the first match because
2462                 * the list is sorted from longest to shortest mask
2463                 * so we have found the most specific match
2464                 */
2465                 for (found = 1, i = 0; i < 8; i++) {
2466                         if ((sap->s6_addr16[i] & snp->smk_mask.s6_addr16[i]) !=
2467                             snp->smk_host.s6_addr16[i]) {
2468                                 found = 0;
2469                                 break;
2470                         }
2471                 }
2472                 if (found)
2473                         return snp->smk_label;
2474         }
2475 
2476         return NULL;
2477 }
2478 #endif /* CONFIG_IPV6 */
2479 
2480 /**
2481  * smack_netlabel - Set the secattr on a socket
2482  * @sk: the socket
2483  * @labeled: socket label scheme
2484  *
2485  * Convert the outbound smack value (smk_out) to a
2486  * secattr and attach it to the socket.
2487  *
2488  * Returns 0 on success or an error code
2489  */
2490 static int smack_netlabel(struct sock *sk, int labeled)
2491 {
2492         struct smack_known *skp;
2493         struct socket_smack *ssp = sk->sk_security;
2494         int rc = 0;
2495 
2496         /*
2497          * Usually the netlabel code will handle changing the
2498          * packet labeling based on the label.
2499          * The case of a single label host is different, because
2500          * a single label host should never get a labeled packet
2501          * even though the label is usually associated with a packet
2502          * label.
2503          */
2504         local_bh_disable();
2505         bh_lock_sock_nested(sk);
2506 
2507         if (ssp->smk_out == smack_net_ambient ||
2508             labeled == SMACK_UNLABELED_SOCKET)
2509                 netlbl_sock_delattr(sk);
2510         else {
2511                 skp = ssp->smk_out;
2512                 rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel);
2513         }
2514 
2515         bh_unlock_sock(sk);
2516         local_bh_enable();
2517 
2518         return rc;
2519 }
2520 
2521 /**
2522  * smack_netlbel_send - Set the secattr on a socket and perform access checks
2523  * @sk: the socket
2524  * @sap: the destination address
2525  *
2526  * Set the correct secattr for the given socket based on the destination
2527  * address and perform any outbound access checks needed.
2528  *
2529  * Returns 0 on success or an error code.
2530  *
2531  */
2532 static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap)
2533 {
2534         struct smack_known *skp;
2535         int rc;
2536         int sk_lbl;
2537         struct smack_known *hkp;
2538         struct socket_smack *ssp = sk->sk_security;
2539         struct smk_audit_info ad;
2540 
2541         rcu_read_lock();
2542         hkp = smack_ipv4host_label(sap);
2543         if (hkp != NULL) {
2544 #ifdef CONFIG_AUDIT
2545                 struct lsm_network_audit net;
2546 
2547                 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
2548                 ad.a.u.net->family = sap->sin_family;
2549                 ad.a.u.net->dport = sap->sin_port;
2550                 ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr;
2551 #endif
2552                 sk_lbl = SMACK_UNLABELED_SOCKET;
2553                 skp = ssp->smk_out;
2554                 rc = smk_access(skp, hkp, MAY_WRITE, &ad);
2555                 rc = smk_bu_note("IPv4 host check", skp, hkp, MAY_WRITE, rc);
2556         } else {
2557                 sk_lbl = SMACK_CIPSO_SOCKET;
2558                 rc = 0;
2559         }
2560         rcu_read_unlock();
2561         if (rc != 0)
2562                 return rc;
2563 
2564         return smack_netlabel(sk, sk_lbl);
2565 }
2566 
2567 #if IS_ENABLED(CONFIG_IPV6)
2568 /**
2569  * smk_ipv6_check - check Smack access
2570  * @subject: subject Smack label
2571  * @object: object Smack label
2572  * @address: address
2573  * @act: the action being taken
2574  *
2575  * Check an IPv6 access
2576  */
2577 static int smk_ipv6_check(struct smack_known *subject,
2578                                 struct smack_known *object,
2579                                 struct sockaddr_in6 *address, int act)
2580 {
2581 #ifdef CONFIG_AUDIT
2582         struct lsm_network_audit net;
2583 #endif
2584         struct smk_audit_info ad;
2585         int rc;
2586 
2587 #ifdef CONFIG_AUDIT
2588         smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
2589         ad.a.u.net->family = PF_INET6;
2590         ad.a.u.net->dport = ntohs(address->sin6_port);
2591         if (act == SMK_RECEIVING)
2592                 ad.a.u.net->v6info.saddr = address->sin6_addr;
2593         else
2594                 ad.a.u.net->v6info.daddr = address->sin6_addr;
2595 #endif
2596         rc = smk_access(subject, object, MAY_WRITE, &ad);
2597         rc = smk_bu_note("IPv6 check", subject, object, MAY_WRITE, rc);
2598         return rc;
2599 }
2600 #endif /* CONFIG_IPV6 */
2601 
2602 #ifdef SMACK_IPV6_PORT_LABELING
2603 /**
2604  * smk_ipv6_port_label - Smack port access table management
2605  * @sock: socket
2606  * @address: address
2607  *
2608  * Create or update the port list entry
2609  */
2610 static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address)
2611 {
2612         struct sock *sk = sock->sk;
2613         struct sockaddr_in6 *addr6;
2614         struct socket_smack *ssp = sock->sk->sk_security;
2615         struct smk_port_label *spp;
2616         unsigned short port = 0;
2617 
2618         if (address == NULL) {
2619                 /*
2620                  * This operation is changing the Smack information
2621                  * on the bound socket. Take the changes to the port
2622                  * as well.
2623                  */
2624                 rcu_read_lock();
2625                 list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) {
2626                         if (sk != spp->smk_sock)
2627                                 continue;
2628                         spp->smk_in = ssp->smk_in;
2629                         spp->smk_out = ssp->smk_out;
2630                         rcu_read_unlock();
2631                         return;
2632                 }
2633                 /*
2634                  * A NULL address is only used for updating existing
2635                  * bound entries. If there isn't one, it's OK.
2636                  */
2637                 rcu_read_unlock();
2638                 return;
2639         }
2640 
2641         addr6 = (struct sockaddr_in6 *)address;
2642         port = ntohs(addr6->sin6_port);
2643         /*
2644          * This is a special case that is safely ignored.
2645          */
2646         if (port == 0)
2647                 return;
2648 
2649         /*
2650          * Look for an existing port list entry.
2651          * This is an indication that a port is getting reused.
2652          */
2653         rcu_read_lock();
2654         list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) {
2655                 if (spp->smk_port != port || spp->smk_sock_type != sock->type)
2656                         continue;
2657                 if (spp->smk_can_reuse != 1) {
2658                         rcu_read_unlock();
2659                         return;
2660                 }
2661                 spp->smk_port = port;
2662                 spp->smk_sock = sk;
2663                 spp->smk_in = ssp->smk_in;
2664                 spp->smk_out = ssp->smk_out;
2665                 spp->smk_can_reuse = 0;
2666                 rcu_read_unlock();
2667                 return;
2668         }
2669         rcu_read_unlock();
2670         /*
2671          * A new port entry is required.
2672          */
2673         spp = kzalloc(sizeof(*spp), GFP_KERNEL);
2674         if (spp == NULL)
2675                 return;
2676 
2677         spp->smk_port = port;
2678         spp->smk_sock = sk;
2679         spp->smk_in = ssp->smk_in;
2680         spp->smk_out = ssp->smk_out;
2681         spp->smk_sock_type = sock->type;
2682         spp->smk_can_reuse = 0;
2683 
2684         mutex_lock(&smack_ipv6_lock);
2685         list_add_rcu(&spp->list, &smk_ipv6_port_list);
2686         mutex_unlock(&smack_ipv6_lock);
2687         return;
2688 }
2689 
2690 /**
2691  * smk_ipv6_port_check - check Smack port access
2692  * @sock: socket
2693  * @address: address
2694  *
2695  * Create or update the port list entry
2696  */
2697 static int smk_ipv6_port_check(struct sock *sk, struct sockaddr_in6 *address,
2698                                 int act)
2699 {
2700         struct smk_port_label *spp;
2701         struct socket_smack *ssp = sk->sk_security;
2702         struct smack_known *skp = NULL;
2703         unsigned short port;
2704         struct smack_known *object;
2705 
2706         if (act == SMK_RECEIVING) {
2707                 skp = smack_ipv6host_label(address);
2708                 object = ssp->smk_in;
2709         } else {
2710                 skp = ssp->smk_out;
2711                 object = smack_ipv6host_label(address);
2712         }
2713 
2714         /*
2715          * The other end is a single label host.
2716          */
2717         if (skp != NULL && object != NULL)
2718                 return smk_ipv6_check(skp, object, address, act);
2719         if (skp == NULL)
2720                 skp = smack_net_ambient;
2721         if (object == NULL)
2722                 object = smack_net_ambient;
2723 
2724         /*
2725          * It's remote, so port lookup does no good.
2726          */
2727         if (!smk_ipv6_localhost(address))
2728                 return smk_ipv6_check(skp, object, address, act);
2729 
2730         /*
2731          * It's local so the send check has to have passed.
2732          */
2733         if (act == SMK_RECEIVING)
2734                 return 0;
2735 
2736         port = ntohs(address->sin6_port);
2737         rcu_read_lock();
2738         list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) {
2739                 if (spp->smk_port != port || spp->smk_sock_type != sk->sk_type)
2740                         continue;
2741                 object = spp->smk_in;
2742                 if (act == SMK_CONNECTING)
2743                         ssp->smk_packet = spp->smk_out;
2744                 break;
2745         }
2746         rcu_read_unlock();
2747 
2748         return smk_ipv6_check(skp, object, address, act);
2749 }
2750 #endif /* SMACK_IPV6_PORT_LABELING */
2751 
2752 /**
2753  * smack_inode_setsecurity - set smack xattrs
2754  * @inode: the object
2755  * @name: attribute name
2756  * @value: attribute value
2757  * @size: size of the attribute
2758  * @flags: unused
2759  *
2760  * Sets the named attribute in the appropriate blob
2761  *
2762  * Returns 0 on success, or an error code
2763  */
2764 static int smack_inode_setsecurity(struct inode *inode, const char *name,
2765                                    const void *value, size_t size, int flags)
2766 {
2767         struct smack_known *skp;
2768         struct inode_smack *nsp = inode->i_security;
2769         struct socket_smack *ssp;
2770         struct socket *sock;
2771         int rc = 0;
2772 
2773         if (value == NULL || size > SMK_LONGLABEL || size == 0)
2774                 return -EINVAL;
2775 
2776         skp = smk_import_entry(value, size);
2777         if (IS_ERR(skp))
2778                 return PTR_ERR(skp);
2779 
2780         if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
2781                 nsp->smk_inode = skp;
2782                 nsp->smk_flags |= SMK_INODE_INSTANT;
2783                 return 0;
2784         }
2785         /*
2786          * The rest of the Smack xattrs are only on sockets.
2787          */
2788         if (inode->i_sb->s_magic != SOCKFS_MAGIC)
2789                 return -EOPNOTSUPP;
2790 
2791         sock = SOCKET_I(inode);
2792         if (sock == NULL || sock->sk == NULL)
2793                 return -EOPNOTSUPP;
2794 
2795         ssp = sock->sk->sk_security;
2796 
2797         if (strcmp(name, XATTR_SMACK_IPIN) == 0)
2798                 ssp->smk_in = skp;
2799         else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) {
2800                 ssp->smk_out = skp;
2801                 if (sock->sk->sk_family == PF_INET) {
2802                         rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
2803                         if (rc != 0)
2804                                 printk(KERN_WARNING
2805                                         "Smack: \"%s\" netlbl error %d.\n",
2806                                         __func__, -rc);
2807                 }
2808         } else
2809                 return -EOPNOTSUPP;
2810 
2811 #ifdef SMACK_IPV6_PORT_LABELING
2812         if (sock->sk->sk_family == PF_INET6)
2813                 smk_ipv6_port_label(sock, NULL);
2814 #endif
2815 
2816         return 0;
2817 }
2818 
2819 /**
2820  * smack_socket_post_create - finish socket setup
2821  * @sock: the socket
2822  * @family: protocol family
2823  * @type: unused
2824  * @protocol: unused
2825  * @kern: unused
2826  *
2827  * Sets the netlabel information on the socket
2828  *
2829  * Returns 0 on success, and error code otherwise
2830  */
2831 static int smack_socket_post_create(struct socket *sock, int family,
2832                                     int type, int protocol, int kern)
2833 {
2834         struct socket_smack *ssp;
2835 
2836         if (sock->sk == NULL)
2837                 return 0;
2838 
2839         /*
2840          * Sockets created by kernel threads receive web label.
2841          */
2842         if (unlikely(current->flags & PF_KTHREAD)) {
2843                 ssp = sock->sk->sk_security;
2844                 ssp->smk_in = &smack_known_web;
2845                 ssp->smk_out = &smack_known_web;
2846         }
2847 
2848         if (family != PF_INET)
2849                 return 0;
2850         /*
2851          * Set the outbound netlbl.
2852          */
2853         return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
2854 }
2855 
2856 #ifdef SMACK_IPV6_PORT_LABELING
2857 /**
2858  * smack_socket_bind - record port binding information.
2859  * @sock: the socket
2860  * @address: the port address
2861  * @addrlen: size of the address
2862  *
2863  * Records the label bound to a port.
2864  *
2865  * Returns 0
2866  */
2867 static int smack_socket_bind(struct socket *sock, struct sockaddr *address,
2868                                 int addrlen)
2869 {
2870         if (sock->sk != NULL && sock->sk->sk_family == PF_INET6)
2871                 smk_ipv6_port_label(sock, address);
2872         return 0;
2873 }
2874 #endif /* SMACK_IPV6_PORT_LABELING */
2875 
2876 /**
2877  * smack_socket_connect - connect access check
2878  * @sock: the socket
2879  * @sap: the other end
2880  * @addrlen: size of sap
2881  *
2882  * Verifies that a connection may be possible
2883  *
2884  * Returns 0 on success, and error code otherwise
2885  */
2886 static int smack_socket_connect(struct socket *sock, struct sockaddr *sap,
2887                                 int addrlen)
2888 {
2889         int rc = 0;
2890 #if IS_ENABLED(CONFIG_IPV6)
2891         struct sockaddr_in6 *sip = (struct sockaddr_in6 *)sap;
2892 #endif
2893 #ifdef SMACK_IPV6_SECMARK_LABELING
2894         struct smack_known *rsp;
2895         struct socket_smack *ssp = sock->sk->sk_security;
2896 #endif
2897 
2898         if (sock->sk == NULL)
2899                 return 0;
2900 
2901         switch (sock->sk->sk_family) {
2902         case PF_INET:
2903                 if (addrlen < sizeof(struct sockaddr_in))
2904                         return -EINVAL;
2905                 rc = smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap);
2906                 break;
2907         case PF_INET6:
2908                 if (addrlen < sizeof(struct sockaddr_in6))
2909                         return -EINVAL;
2910 #ifdef SMACK_IPV6_SECMARK_LABELING
2911                 rsp = smack_ipv6host_label(sip);
2912                 if (rsp != NULL)
2913                         rc = smk_ipv6_check(ssp->smk_out, rsp, sip,
2914                                                 SMK_CONNECTING);
2915 #endif
2916 #ifdef SMACK_IPV6_PORT_LABELING
2917                 rc = smk_ipv6_port_check(sock->sk, sip, SMK_CONNECTING);
2918 #endif
2919                 break;
2920         }
2921         return rc;
2922 }
2923 
2924 /**
2925  * smack_flags_to_may - convert S_ to MAY_ values
2926  * @flags: the S_ value
2927  *
2928  * Returns the equivalent MAY_ value
2929  */
2930 static int smack_flags_to_may(int flags)
2931 {
2932         int may = 0;
2933 
2934         if (flags & S_IRUGO)
2935                 may |= MAY_READ;
2936         if (flags & S_IWUGO)
2937                 may |= MAY_WRITE;
2938         if (flags & S_IXUGO)
2939                 may |= MAY_EXEC;
2940 
2941         return may;
2942 }
2943 
2944 /**
2945  * smack_msg_msg_alloc_security - Set the security blob for msg_msg
2946  * @msg: the object
2947  *
2948  * Returns 0
2949  */
2950 static int smack_msg_msg_alloc_security(struct msg_msg *msg)
2951 {
2952         struct smack_known *skp = smk_of_current();
2953 
2954         msg->security = skp;
2955         return 0;
2956 }
2957 
2958 /**
2959  * smack_msg_msg_free_security - Clear the security blob for msg_msg
2960  * @msg: the object
2961  *
2962  * Clears the blob pointer
2963  */
2964 static void smack_msg_msg_free_security(struct msg_msg *msg)
2965 {
2966         msg->security = NULL;
2967 }
2968 
2969 /**
2970  * smack_of_shm - the smack pointer for the shm
2971  * @shp: the object
2972  *
2973  * Returns a pointer to the smack value
2974  */
2975 static struct smack_known *smack_of_shm(struct shmid_kernel *shp)
2976 {
2977         return (struct smack_known *)shp->shm_perm.security;
2978 }
2979 
2980 /**
2981  * smack_shm_alloc_security - Set the security blob for shm
2982  * @shp: the object
2983  *
2984  * Returns 0
2985  */
2986 static int smack_shm_alloc_security(struct shmid_kernel *shp)
2987 {
2988         struct kern_ipc_perm *isp = &shp->shm_perm;
2989         struct smack_known *skp = smk_of_current();
2990 
2991         isp->security = skp;
2992         return 0;
2993 }
2994 
2995 /**
2996  * smack_shm_free_security - Clear the security blob for shm
2997  * @shp: the object
2998  *
2999  * Clears the blob pointer
3000  */
3001 static void smack_shm_free_security(struct shmid_kernel *shp)
3002 {
3003         struct kern_ipc_perm *isp = &shp->shm_perm;
3004 
3005         isp->security = NULL;
3006 }
3007 
3008 /**
3009  * smk_curacc_shm : check if current has access on shm
3010  * @shp : the object
3011  * @access : access requested
3012  *
3013  * Returns 0 if current has the requested access, error code otherwise
3014  */
3015 static int smk_curacc_shm(struct shmid_kernel *shp, int access)
3016 {
3017         struct smack_known *ssp = smack_of_shm(shp);
3018         struct smk_audit_info ad;
3019         int rc;
3020 
3021 #ifdef CONFIG_AUDIT
3022         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
3023         ad.a.u.ipc_id = shp->shm_perm.id;
3024 #endif
3025         rc = smk_curacc(ssp, access, &ad);
3026         rc = smk_bu_current("shm", ssp, access, rc);
3027         return rc;
3028 }
3029 
3030 /**
3031  * smack_shm_associate - Smack access check for shm
3032  * @shp: the object
3033  * @shmflg: access requested
3034  *
3035  * Returns 0 if current has the requested access, error code otherwise
3036  */
3037 static int smack_shm_associate(struct shmid_kernel *shp, int shmflg)
3038 {
3039         int may;
3040 
3041         may = smack_flags_to_may(shmflg);
3042         return smk_curacc_shm(shp, may);
3043 }
3044 
3045 /**
3046  * smack_shm_shmctl - Smack access check for shm
3047  * @shp: the object
3048  * @cmd: what it wants to do
3049  *
3050  * Returns 0 if current has the requested access, error code otherwise
3051  */
3052 static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd)
3053 {
3054         int may;
3055 
3056         switch (cmd) {
3057         case IPC_STAT:
3058         case SHM_STAT:
3059                 may = MAY_READ;
3060                 break;
3061         case IPC_SET:
3062         case SHM_LOCK:
3063         case SHM_UNLOCK:
3064         case IPC_RMID:
3065                 may = MAY_READWRITE;
3066                 break;
3067         case IPC_INFO:
3068         case SHM_INFO:
3069                 /*
3070                  * System level information.
3071                  */
3072                 return 0;
3073         default:
3074                 return -EINVAL;
3075         }
3076         return smk_curacc_shm(shp, may);
3077 }
3078 
3079 /**
3080  * smack_shm_shmat - Smack access for shmat
3081  * @shp: the object
3082  * @shmaddr: unused
3083  * @shmflg: access requested
3084  *
3085  * Returns 0 if current has the requested access, error code otherwise
3086  */
3087 static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr,
3088                            int shmflg)
3089 {
3090         int may;
3091 
3092         may = smack_flags_to_may(shmflg);
3093         return smk_curacc_shm(shp, may);
3094 }
3095 
3096 /**
3097  * smack_of_sem - the smack pointer for the sem
3098  * @sma: the object
3099  *
3100  * Returns a pointer to the smack value
3101  */
3102 static struct smack_known *smack_of_sem(struct sem_array *sma)
3103 {
3104         return (struct smack_known *)sma->sem_perm.security;
3105 }
3106 
3107 /**
3108  * smack_sem_alloc_security - Set the security blob for sem
3109  * @sma: the object
3110  *
3111  * Returns 0
3112  */
3113 static int smack_sem_alloc_security(struct sem_array *sma)
3114 {
3115         struct kern_ipc_perm *isp = &sma->sem_perm;
3116         struct smack_known *skp = smk_of_current();
3117 
3118         isp->security = skp;
3119         return 0;
3120 }
3121 
3122 /**
3123  * smack_sem_free_security - Clear the security blob for sem
3124  * @sma: the object
3125  *
3126  * Clears the blob pointer
3127  */
3128 static void smack_sem_free_security(struct sem_array *sma)
3129 {
3130         struct kern_ipc_perm *isp = &sma->sem_perm;
3131 
3132         isp->security = NULL;
3133 }
3134 
3135 /**
3136  * smk_curacc_sem : check if current has access on sem
3137  * @sma : the object
3138  * @access : access requested
3139  *
3140  * Returns 0 if current has the requested access, error code otherwise
3141  */
3142 static int smk_curacc_sem(struct sem_array *sma, int access)
3143 {
3144         struct smack_known *ssp = smack_of_sem(sma);
3145         struct smk_audit_info ad;
3146         int rc;
3147 
3148 #ifdef CONFIG_AUDIT
3149         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
3150         ad.a.u.ipc_id = sma->sem_perm.id;
3151 #endif
3152         rc = smk_curacc(ssp, access, &ad);
3153         rc = smk_bu_current("sem", ssp, access, rc);
3154         return rc;
3155 }
3156 
3157 /**
3158  * smack_sem_associate - Smack access check for sem
3159  * @sma: the object
3160  * @semflg: access requested
3161  *
3162  * Returns 0 if current has the requested access, error code otherwise
3163  */
3164 static int smack_sem_associate(struct sem_array *sma, int semflg)
3165 {
3166         int may;
3167 
3168         may = smack_flags_to_may(semflg);
3169         return smk_curacc_sem(sma, may);
3170 }
3171 
3172 /**
3173  * smack_sem_shmctl - Smack access check for sem
3174  * @sma: the object
3175  * @cmd: what it wants to do
3176  *
3177  * Returns 0 if current has the requested access, error code otherwise
3178  */
3179 static int smack_sem_semctl(struct sem_array *sma, int cmd)
3180 {
3181         int may;
3182 
3183         switch (cmd) {
3184         case GETPID:
3185         case GETNCNT:
3186         case GETZCNT:
3187         case GETVAL:
3188         case GETALL:
3189         case IPC_STAT:
3190         case SEM_STAT:
3191                 may = MAY_READ;
3192                 break;
3193         case SETVAL:
3194         case SETALL:
3195         case IPC_RMID:
3196         case IPC_SET:
3197                 may = MAY_READWRITE;
3198                 break;
3199         case IPC_INFO:
3200         case SEM_INFO:
3201                 /*
3202                  * System level information
3203                  */
3204                 return 0;
3205         default:
3206                 return -EINVAL;
3207         }
3208 
3209         return smk_curacc_sem(sma, may);
3210 }
3211 
3212 /**
3213  * smack_sem_semop - Smack checks of semaphore operations
3214  * @sma: the object
3215  * @sops: unused
3216  * @nsops: unused
3217  * @alter: unused
3218  *
3219  * Treated as read and write in all cases.
3220  *
3221  * Returns 0 if access is allowed, error code otherwise
3222  */
3223 static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops,
3224                            unsigned nsops, int alter)
3225 {
3226         return smk_curacc_sem(sma, MAY_READWRITE);
3227 }
3228 
3229 /**
3230  * smack_msg_alloc_security - Set the security blob for msg
3231  * @msq: the object
3232  *
3233  * Returns 0
3234  */
3235 static int smack_msg_queue_alloc_security(struct msg_queue *msq)
3236 {
3237         struct kern_ipc_perm *kisp = &msq->q_perm;
3238         struct smack_known *skp = smk_of_current();
3239 
3240         kisp->security = skp;
3241         return 0;
3242 }
3243 
3244 /**
3245  * smack_msg_free_security - Clear the security blob for msg
3246  * @msq: the object
3247  *
3248  * Clears the blob pointer
3249  */
3250 static void smack_msg_queue_free_security(struct msg_queue *msq)
3251 {
3252         struct kern_ipc_perm *kisp = &msq->q_perm;
3253 
3254         kisp->security = NULL;
3255 }
3256 
3257 /**
3258  * smack_of_msq - the smack pointer for the msq
3259  * @msq: the object
3260  *
3261  * Returns a pointer to the smack label entry
3262  */
3263 static struct smack_known *smack_of_msq(struct msg_queue *msq)
3264 {
3265         return (struct smack_known *)msq->q_perm.security;
3266 }
3267 
3268 /**
3269  * smk_curacc_msq : helper to check if current has access on msq
3270  * @msq : the msq
3271  * @access : access requested
3272  *
3273  * return 0 if current has access, error otherwise
3274  */
3275 static int smk_curacc_msq(struct msg_queue *msq, int access)
3276 {
3277         struct smack_known *msp = smack_of_msq(msq);
3278         struct smk_audit_info ad;
3279         int rc;
3280 
3281 #ifdef CONFIG_AUDIT
3282         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
3283         ad.a.u.ipc_id = msq->q_perm.id;
3284 #endif
3285         rc = smk_curacc(msp, access, &ad);
3286         rc = smk_bu_current("msq", msp, access, rc);
3287         return rc;
3288 }
3289 
3290 /**
3291  * smack_msg_queue_associate - Smack access check for msg_queue
3292  * @msq: the object
3293  * @msqflg: access requested
3294  *
3295  * Returns 0 if current has the requested access, error code otherwise
3296  */
3297 static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg)
3298 {
3299         int may;
3300 
3301         may = smack_flags_to_may(msqflg);
3302         return smk_curacc_msq(msq, may);
3303 }
3304 
3305 /**
3306  * smack_msg_queue_msgctl - Smack access check for msg_queue
3307  * @msq: the object
3308  * @cmd: what it wants to do
3309  *
3310  * Returns 0 if current has the requested access, error code otherwise
3311  */
3312 static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd)
3313 {
3314         int may;
3315 
3316         switch (cmd) {
3317         case IPC_STAT:
3318         case MSG_STAT:
3319                 may = MAY_READ;
3320                 break;
3321         case IPC_SET:
3322         case IPC_RMID:
3323                 may = MAY_READWRITE;
3324                 break;
3325         case IPC_INFO:
3326         case MSG_INFO:
3327                 /*
3328                  * System level information
3329                  */
3330                 return 0;
3331         default:
3332                 return -EINVAL;
3333         }
3334 
3335         return smk_curacc_msq(msq, may);
3336 }
3337 
3338 /**
3339  * smack_msg_queue_msgsnd - Smack access check for msg_queue
3340  * @msq: the object
3341  * @msg: unused
3342  * @msqflg: access requested
3343  *
3344  * Returns 0 if current has the requested access, error code otherwise
3345  */
3346 static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg,
3347                                   int msqflg)
3348 {
3349         int may;
3350 
3351         may = smack_flags_to_may(msqflg);
3352         return smk_curacc_msq(msq, may);
3353 }
3354 
3355 /**
3356  * smack_msg_queue_msgsnd - Smack access check for msg_queue
3357  * @msq: the object
3358  * @msg: unused
3359  * @target: unused
3360  * @type: unused
3361  * @mode: unused
3362  *
3363  * Returns 0 if current has read and write access, error code otherwise
3364  */
3365 static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
3366                         struct task_struct *target, long type, int mode)
3367 {
3368         return smk_curacc_msq(msq, MAY_READWRITE);
3369 }
3370 
3371 /**
3372  * smack_ipc_permission - Smack access for ipc_permission()
3373  * @ipp: the object permissions
3374  * @flag: access requested
3375  *
3376  * Returns 0 if current has read and write access, error code otherwise
3377  */
3378 static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag)
3379 {
3380         struct smack_known *iskp = ipp->security;
3381         int may = smack_flags_to_may(flag);
3382         struct smk_audit_info ad;
3383         int rc;
3384 
3385 #ifdef CONFIG_AUDIT
3386         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
3387         ad.a.u.ipc_id = ipp->id;
3388 #endif
3389         rc = smk_curacc(iskp, may, &ad);
3390         rc = smk_bu_current("svipc", iskp, may, rc);
3391         return rc;
3392 }
3393 
3394 /**
3395  * smack_ipc_getsecid - Extract smack security id
3396  * @ipp: the object permissions
3397  * @secid: where result will be saved
3398  */
3399 static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid)
3400 {
3401         struct smack_known *iskp = ipp->security;
3402 
3403         *secid = iskp->smk_secid;
3404 }
3405 
3406 /**
3407  * smack_d_instantiate - Make sure the blob is correct on an inode
3408  * @opt_dentry: dentry where inode will be attached
3409  * @inode: the object
3410  *
3411  * Set the inode's security blob if it hasn't been done already.
3412  */
3413 static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
3414 {
3415         struct super_block *sbp;
3416         struct superblock_smack *sbsp;
3417         struct inode_smack *isp;
3418         struct smack_known *skp;
3419         struct smack_known *ckp = smk_of_current();
3420         struct smack_known *final;
3421         char trattr[TRANS_TRUE_SIZE];
3422         int transflag = 0;
3423         int rc;
3424         struct dentry *dp;
3425 
3426         if (inode == NULL)
3427                 return;
3428 
3429         isp = inode->i_security;
3430 
3431         mutex_lock(&isp->smk_lock);
3432         /*
3433          * If the inode is already instantiated
3434          * take the quick way out
3435          */
3436         if (isp->smk_flags & SMK_INODE_INSTANT)
3437                 goto unlockandout;
3438 
3439         sbp = inode->i_sb;
3440         sbsp = sbp->s_security;
3441         /*
3442          * We're going to use the superblock default label
3443          * if there's no label on the file.
3444          */
3445         final = sbsp->smk_default;
3446 
3447         /*
3448          * If this is the root inode the superblock
3449          * may be in the process of initialization.
3450          * If that is the case use the root value out
3451          * of the superblock.
3452          */
3453         if (opt_dentry->d_parent == opt_dentry) {
3454                 switch (sbp->s_magic) {
3455                 case CGROUP_SUPER_MAGIC:
3456                         /*
3457                          * The cgroup filesystem is never mounted,
3458                          * so there's no opportunity to set the mount
3459                          * options.
3460                          */
3461                         sbsp->smk_root = &smack_known_star;
3462                         sbsp->smk_default = &smack_known_star;
3463                         isp->smk_inode = sbsp->smk_root;
3464                         break;
3465                 case TMPFS_MAGIC:
3466                         /*
3467                          * What about shmem/tmpfs anonymous files with dentry
3468                          * obtained from d_alloc_pseudo()?
3469                          */
3470                         isp->smk_inode = smk_of_current();
3471                         break;
3472                 case PIPEFS_MAGIC:
3473                         isp->smk_inode = smk_of_current();
3474                         break;
3475                 case SOCKFS_MAGIC:
3476                         /*
3477                          * Socket access is controlled by the socket
3478                          * structures associated with the task involved.
3479                          */
3480                         isp->smk_inode = &smack_known_star;
3481                         break;
3482                 default:
3483                         isp->smk_inode = sbsp->smk_root;
3484                         break;
3485                 }
3486                 isp->smk_flags |= SMK_INODE_INSTANT;
3487                 goto unlockandout;
3488         }
3489 
3490         /*
3491          * This is pretty hackish.
3492          * Casey says that we shouldn't have to do
3493          * file system specific code, but it does help
3494          * with keeping it simple.
3495          */
3496         switch (sbp->s_magic) {
3497         case SMACK_MAGIC:
3498         case CGROUP_SUPER_MAGIC:
3499                 /*
3500                  * Casey says that it's a little embarrassing
3501                  * that the smack file system doesn't do
3502                  * extended attributes.
3503                  *
3504                  * Cgroupfs is special
3505                  */
3506                 final = &smack_known_star;
3507                 break;
3508         case DEVPTS_SUPER_MAGIC:
3509                 /*
3510                  * devpts seems content with the label of the task.
3511                  * Programs that change smack have to treat the
3512                  * pty with respect.
3513                  */
3514                 final = ckp;
3515                 break;
3516         case PROC_SUPER_MAGIC:
3517                 /*
3518                  * Casey says procfs appears not to care.
3519                  * The superblock default suffices.
3520                  */
3521                 break;
3522         case TMPFS_MAGIC:
3523                 /*
3524                  * Device labels should come from the filesystem,
3525                  * but watch out, because they're volitile,
3526                  * getting recreated on every reboot.
3527                  */
3528                 final = &smack_known_star;
3529                 /*
3530                  * No break.
3531                  *
3532                  * If a smack value has been set we want to use it,
3533                  * but since tmpfs isn't giving us the opportunity
3534                  * to set mount options simulate setting the
3535                  * superblock default.
3536                  */
3537         default:
3538                 /*
3539                  * This isn't an understood special case.
3540                  * Get the value from the xattr.
3541                  */
3542 
3543                 /*
3544                  * UNIX domain sockets use lower level socket data.
3545                  */
3546                 if (S_ISSOCK(inode->i_mode)) {
3547                         final = &smack_known_star;
3548                         break;
3549                 }
3550                 /*
3551                  * No xattr support means, alas, no SMACK label.
3552                  * Use the aforeapplied default.
3553                  * It would be curious if the label of the task
3554                  * does not match that assigned.
3555                  */
3556                 if (!(inode->i_opflags & IOP_XATTR))
3557                         break;
3558                 /*
3559                  * Get the dentry for xattr.
3560                  */
3561                 dp = dget(opt_dentry);
3562                 skp = smk_fetch(XATTR_NAME_SMACK, inode, dp);
3563                 if (!IS_ERR_OR_NULL(skp))
3564                         final = skp;
3565 
3566                 /*
3567                  * Transmuting directory
3568                  */
3569                 if (S_ISDIR(inode->i_mode)) {
3570                         /*
3571                          * If this is a new directory and the label was
3572                          * transmuted when the inode was initialized
3573                          * set the transmute attribute on the directory
3574                          * and mark the inode.
3575                          *
3576                          * If there is a transmute attribute on the
3577                          * directory mark the inode.
3578                          */
3579                         if (isp->smk_flags & SMK_INODE_CHANGED) {
3580                                 isp->smk_flags &= ~SMK_INODE_CHANGED;
3581                                 rc = __vfs_setxattr(dp, inode,
3582                                         XATTR_NAME_SMACKTRANSMUTE,
3583                                         TRANS_TRUE, TRANS_TRUE_SIZE,
3584                                         0);
3585                         } else {
3586                                 rc = __vfs_getxattr(dp, inode,
3587                                         XATTR_NAME_SMACKTRANSMUTE, trattr,
3588                                         TRANS_TRUE_SIZE);
3589                                 if (rc >= 0 && strncmp(trattr, TRANS_TRUE,
3590                                                        TRANS_TRUE_SIZE) != 0)
3591                                         rc = -EINVAL;
3592                         }
3593                         if (rc >= 0)
3594                                 transflag = SMK_INODE_TRANSMUTE;
3595                 }
3596                 /*
3597                  * Don't let the exec or mmap label be "*" or "@".
3598                  */
3599                 skp = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp);
3600                 if (IS_ERR(skp) || skp == &smack_known_star ||
3601                     skp == &smack_known_web)
3602                         skp = NULL;
3603                 isp->smk_task = skp;
3604 
3605                 skp = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp);
3606                 if (IS_ERR(skp) || skp == &smack_known_star ||
3607                     skp == &smack_known_web)
3608                         skp = NULL;
3609                 isp->smk_mmap = skp;
3610 
3611                 dput(dp);
3612                 break;
3613         }
3614 
3615         if (final == NULL)
3616                 isp->smk_inode = ckp;
3617         else
3618                 isp->smk_inode = final;
3619 
3620         isp->smk_flags |= (SMK_INODE_INSTANT | transflag);
3621 
3622 unlockandout:
3623         mutex_unlock(&isp->smk_lock);
3624         return;
3625 }
3626 
3627 /**
3628  * smack_getprocattr - Smack process attribute access
3629  * @p: the object task
3630  * @name: the name of the attribute in /proc/.../attr
3631  * @value: where to put the result
3632  *
3633  * Places a copy of the task Smack into value
3634  *
3635  * Returns the length of the smack label or an error code
3636  */
3637 static int smack_getprocattr(struct task_struct *p, char *name, char **value)
3638 {
3639         struct smack_known *skp = smk_of_task_struct(p);
3640         char *cp;
3641         int slen;
3642 
3643         if (strcmp(name, "current") != 0)
3644                 return -EINVAL;
3645 
3646         cp = kstrdup(skp->smk_known, GFP_KERNEL);
3647         if (cp == NULL)
3648                 return -ENOMEM;
3649 
3650         slen = strlen(cp);
3651         *value = cp;
3652         return slen;
3653 }
3654 
3655 /**
3656  * smack_setprocattr - Smack process attribute setting
3657  * @name: the name of the attribute in /proc/.../attr
3658  * @value: the value to set
3659  * @size: the size of the value
3660  *
3661  * Sets the Smack value of the task. Only setting self
3662  * is permitted and only with privilege
3663  *
3664  * Returns the length of the smack label or an error code
3665  */
3666 static int smack_setprocattr(const char *name, void *value, size_t size)
3667 {
3668         struct task_smack *tsp = current_security();
3669         struct cred *new;
3670         struct smack_known *skp;
3671         struct smack_known_list_elem *sklep;
3672         int rc;
3673 
3674         if (!smack_privileged(CAP_MAC_ADMIN) && list_empty(&tsp->smk_relabel))
3675                 return -EPERM;
3676 
3677         if (value == NULL || size == 0 || size >= SMK_LONGLABEL)
3678                 return -EINVAL;
3679 
3680         if (strcmp(name, "current") != 0)
3681                 return -EINVAL;
3682 
3683         skp = smk_import_entry(value, size);
3684         if (IS_ERR(skp))
3685                 return PTR_ERR(skp);
3686 
3687         /*
3688          * No process is ever allowed the web ("@") label
3689          * and the star ("*") label.
3690          */
3691         if (skp == &smack_known_web || skp == &smack_known_star)
3692                 return -EINVAL;
3693 
3694         if (!smack_privileged(CAP_MAC_ADMIN)) {
3695                 rc = -EPERM;
3696                 list_for_each_entry(sklep, &tsp->smk_relabel, list)
3697                         if (sklep->smk_label == skp) {
3698                                 rc = 0;
3699                                 break;
3700                         }
3701                 if (rc)
3702                         return rc;
3703         }
3704 
3705         new = prepare_creds();
3706         if (new == NULL)
3707                 return -ENOMEM;
3708 
3709         tsp = new->security;
3710         tsp->smk_task = skp;
3711         /*
3712          * process can change its label only once
3713          */
3714         smk_destroy_label_list(&tsp->smk_relabel);
3715 
3716         commit_creds(new);
3717         return size;
3718 }
3719 
3720 /**
3721  * smack_unix_stream_connect - Smack access on UDS
3722  * @sock: one sock
3723  * @other: the other sock
3724  * @newsk: unused
3725  *
3726  * Return 0 if a subject with the smack of sock could access
3727  * an object with the smack of other, otherwise an error code
3728  */
3729 static int smack_unix_stream_connect(struct sock *sock,
3730                                      struct sock *other, struct sock *newsk)
3731 {
3732         struct smack_known *skp;
3733         struct smack_known *okp;
3734         struct socket_smack *ssp = sock->sk_security;
3735         struct socket_smack *osp = other->sk_security;
3736         struct socket_smack *nsp = newsk->sk_security;
3737         struct smk_audit_info ad;
3738         int rc = 0;
3739 #ifdef CONFIG_AUDIT
3740         struct lsm_network_audit net;
3741 #endif
3742 
3743         if (!smack_privileged(CAP_MAC_OVERRIDE)) {
3744                 skp = ssp->smk_out;
3745                 okp = osp->smk_in;
3746 #ifdef CONFIG_AUDIT
3747                 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3748                 smk_ad_setfield_u_net_sk(&ad, other);
3749 #endif
3750                 rc = smk_access(skp, okp, MAY_WRITE, &ad);
3751                 rc = smk_bu_note("UDS connect", skp, okp, MAY_WRITE, rc);
3752                 if (rc == 0) {
3753                         okp = osp->smk_out;
3754                         skp = ssp->smk_in;
3755                         rc = smk_access(okp, skp, MAY_WRITE, &ad);
3756                         rc = smk_bu_note("UDS connect", okp, skp,
3757                                                 MAY_WRITE, rc);
3758                 }
3759         }
3760 
3761         /*
3762          * Cross reference the peer labels for SO_PEERSEC.
3763          */
3764         if (rc == 0) {
3765                 nsp->smk_packet = ssp->smk_out;
3766                 ssp->smk_packet = osp->smk_out;
3767         }
3768 
3769         return rc;
3770 }
3771 
3772 /**
3773  * smack_unix_may_send - Smack access on UDS
3774  * @sock: one socket
3775  * @other: the other socket
3776  *
3777  * Return 0 if a subject with the smack of sock could access
3778  * an object with the smack of other, otherwise an error code
3779  */
3780 static int smack_unix_may_send(struct socket *sock, struct socket *other)
3781 {
3782         struct socket_smack *ssp = sock->sk->sk_security;
3783         struct socket_smack *osp = other->sk->sk_security;
3784         struct smk_audit_info ad;
3785         int rc;
3786 
3787 #ifdef CONFIG_AUDIT
3788         struct lsm_network_audit net;
3789 
3790         smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3791         smk_ad_setfield_u_net_sk(&ad, other->sk);
3792 #endif
3793 
3794         if (smack_privileged(CAP_MAC_OVERRIDE))
3795                 return 0;
3796 
3797         rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad);
3798         rc = smk_bu_note("UDS send", ssp->smk_out, osp->smk_in, MAY_WRITE, rc);
3799         return rc;
3800 }
3801 
3802 /**
3803  * smack_socket_sendmsg - Smack check based on destination host
3804  * @sock: the socket
3805  * @msg: the message
3806  * @size: the size of the message
3807  *
3808  * Return 0 if the current subject can write to the destination host.
3809  * For IPv4 this is only a question if the destination is a single label host.
3810  * For IPv6 this is a check against the label of the port.
3811  */
3812 static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg,
3813                                 int size)
3814 {
3815         struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name;
3816 #if IS_ENABLED(CONFIG_IPV6)
3817         struct sockaddr_in6 *sap = (struct sockaddr_in6 *) msg->msg_name;
3818 #endif
3819 #ifdef SMACK_IPV6_SECMARK_LABELING
3820         struct socket_smack *ssp = sock->sk->sk_security;
3821         struct smack_known *rsp;
3822 #endif
3823         int rc = 0;
3824 
3825         /*
3826          * Perfectly reasonable for this to be NULL
3827          */
3828         if (sip == NULL)
3829                 return 0;
3830 
3831         switch (sock->sk->sk_family) {
3832         case AF_INET:
3833                 rc = smack_netlabel_send(sock->sk, sip);
3834                 break;
3835         case AF_INET6:
3836 #ifdef SMACK_IPV6_SECMARK_LABELING
3837                 rsp = smack_ipv6host_label(sap);
3838                 if (rsp != NULL)
3839                         rc = smk_ipv6_check(ssp->smk_out, rsp, sap,
3840                                                 SMK_CONNECTING);
3841 #endif
3842 #ifdef SMACK_IPV6_PORT_LABELING
3843                 rc = smk_ipv6_port_check(sock->sk, sap, SMK_SENDING);
3844 #endif
3845                 break;
3846         }
3847         return rc;
3848 }
3849 
3850 /**
3851  * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
3852  * @sap: netlabel secattr
3853  * @ssp: socket security information
3854  *
3855  * Returns a pointer to a Smack label entry found on the label list.
3856  */
3857 static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap,
3858                                                 struct socket_smack *ssp)
3859 {
3860         struct smack_known *skp;
3861         int found = 0;
3862         int acat;
3863         int kcat;
3864 
3865         if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) {
3866                 /*
3867                  * Looks like a CIPSO packet.
3868                  * If there are flags but no level netlabel isn't
3869                  * behaving the way we expect it to.
3870                  *
3871                  * Look it up in the label table
3872                  * Without guidance regarding the smack value
3873                  * for the packet fall back on the network
3874                  * ambient value.
3875                  */
3876                 rcu_read_lock();
3877                 list_for_each_entry_rcu(skp, &smack_known_list, list) {
3878                         if (sap->attr.mls.lvl != skp->smk_netlabel.attr.mls.lvl)
3879                                 continue;
3880                         /*
3881                          * Compare the catsets. Use the netlbl APIs.
3882                          */
3883                         if ((sap->flags & NETLBL_SECATTR_MLS_CAT) == 0) {
3884                                 if ((skp->smk_netlabel.flags &
3885                                      NETLBL_SECATTR_MLS_CAT) == 0)
3886                                         found = 1;
3887                                 break;
3888                         }
3889                         for (acat = -1, kcat = -1; acat == kcat; ) {
3890                                 acat = netlbl_catmap_walk(sap->attr.mls.cat,
3891                                                           acat + 1);
3892                                 kcat = netlbl_catmap_walk(
3893                                         skp->smk_netlabel.attr.mls.cat,
3894                                         kcat + 1);
3895                                 if (acat < 0 || kcat < 0)
3896                                         break;
3897                         }
3898                         if (acat == kcat) {
3899                                 found = 1;
3900                                 break;
3901                         }
3902                 }
3903                 rcu_read_unlock();
3904 
3905                 if (found)
3906                         return skp;
3907 
3908                 if (ssp != NULL && ssp->smk_in == &smack_known_star)
3909                         return &smack_known_web;
3910                 return &smack_known_star;
3911         }
3912         if ((sap->flags & NETLBL_SECATTR_SECID) != 0)
3913                 /*
3914                  * Looks like a fallback, which gives us a secid.
3915                  */
3916                 return smack_from_secid(sap->attr.secid);
3917         /*
3918          * Without guidance regarding the smack value
3919          * for the packet fall back on the network
3920          * ambient value.
3921          */
3922         return smack_net_ambient;
3923 }
3924 
3925 #if IS_ENABLED(CONFIG_IPV6)
3926 static int smk_skb_to_addr_ipv6(struct sk_buff *skb, struct sockaddr_in6 *sip)
3927 {
3928         u8 nexthdr;
3929         int offset;
3930         int proto = -EINVAL;
3931         struct ipv6hdr _ipv6h;
3932         struct ipv6hdr *ip6;
3933         __be16 frag_off;
3934         struct tcphdr _tcph, *th;
3935         struct udphdr _udph, *uh;
3936         struct dccp_hdr _dccph, *dh;
3937 
3938         sip->sin6_port = 0;
3939 
3940         offset = skb_network_offset(skb);
3941         ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h);
3942         if (ip6 == NULL)
3943                 return -EINVAL;
3944         sip->sin6_addr = ip6->saddr;
3945 
3946         nexthdr = ip6->nexthdr;
3947         offset += sizeof(_ipv6h);
3948         offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off);
3949         if (offset < 0)
3950                 return -EINVAL;
3951 
3952         proto = nexthdr;
3953         switch (proto) {
3954         case IPPROTO_TCP:
3955                 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
3956                 if (th != NULL)
3957                         sip->sin6_port = th->source;
3958                 break;
3959         case IPPROTO_UDP:
3960                 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
3961                 if (uh != NULL)
3962                         sip->sin6_port = uh->source;
3963                 break;
3964         case IPPROTO_DCCP:
3965                 dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
3966                 if (dh != NULL)
3967                         sip->sin6_port = dh->dccph_sport;
3968                 break;
3969         }
3970         return proto;
3971 }
3972 #endif /* CONFIG_IPV6 */
3973 
3974 /**
3975  * smack_socket_sock_rcv_skb - Smack packet delivery access check
3976  * @sk: socket
3977  * @skb: packet
3978  *
3979  * Returns 0 if the packet should be delivered, an error code otherwise
3980  */
3981 static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
3982 {
3983         struct netlbl_lsm_secattr secattr;
3984         struct socket_smack *ssp = sk->sk_security;
3985         struct smack_known *skp = NULL;
3986         int rc = 0;
3987         struct smk_audit_info ad;
3988 #ifdef CONFIG_AUDIT
3989         struct lsm_network_audit net;
3990 #endif
3991 #if IS_ENABLED(CONFIG_IPV6)
3992         struct sockaddr_in6 sadd;
3993         int proto;
3994 #endif /* CONFIG_IPV6 */
3995 
3996         switch (sk->sk_family) {
3997         case PF_INET:
3998 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
3999                 /*
4000                  * If there is a secmark use it rather than the CIPSO label.
4001                  * If there is no secmark fall back to CIPSO.
4002                  * The secmark is assumed to reflect policy better.
4003                  */
4004                 if (skb && skb->secmark != 0) {
4005                         skp = smack_from_secid(skb->secmark);
4006                         goto access_check;
4007                 }
4008 #endif /* CONFIG_SECURITY_SMACK_NETFILTER */
4009                 /*
4010                  * Translate what netlabel gave us.
4011                  */
4012                 netlbl_secattr_init(&secattr);
4013 
4014                 rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr);
4015                 if (rc == 0)
4016                         skp = smack_from_secattr(&secattr, ssp);
4017                 else
4018                         skp = smack_net_ambient;
4019 
4020                 netlbl_secattr_destroy(&secattr);
4021 
4022 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4023 access_check:
4024 #endif
4025 #ifdef CONFIG_AUDIT
4026                 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
4027                 ad.a.u.net->family = sk->sk_family;
4028                 ad.a.u.net->netif = skb->skb_iif;
4029                 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
4030 #endif
4031                 /*
4032                  * Receiving a packet requires that the other end
4033                  * be able to write here. Read access is not required.
4034                  * This is the simplist possible security model
4035                  * for networking.
4036                  */
4037                 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
4038                 rc = smk_bu_note("IPv4 delivery", skp, ssp->smk_in,
4039                                         MAY_WRITE, rc);
4040                 if (rc != 0)
4041                         netlbl_skbuff_err(skb, sk->sk_family, rc, 0);
4042                 break;
4043 #if IS_ENABLED(CONFIG_IPV6)
4044         case PF_INET6:
4045                 proto = smk_skb_to_addr_ipv6(skb, &sadd);
4046                 if (proto != IPPROTO_UDP && proto != IPPROTO_TCP)
4047                         break;
4048 #ifdef SMACK_IPV6_SECMARK_LABELING
4049                 if (skb && skb->secmark != 0)
4050                         skp = smack_from_secid(skb->secmark);
4051                 else
4052                         skp = smack_ipv6host_label(&sadd);
4053                 if (skp == NULL)
4054                         skp = smack_net_ambient;
4055 #ifdef CONFIG_AUDIT
4056                 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
4057                 ad.a.u.net->family = sk->sk_family;
4058                 ad.a.u.net->netif = skb->skb_iif;
4059                 ipv6_skb_to_auditdata(skb, &ad.a, NULL);
4060 #endif /* CONFIG_AUDIT */
4061                 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
4062                 rc = smk_bu_note("IPv6 delivery", skp, ssp->smk_in,
4063                                         MAY_WRITE, rc);
4064 #endif /* SMACK_IPV6_SECMARK_LABELING */
4065 #ifdef SMACK_IPV6_PORT_LABELING
4066                 rc = smk_ipv6_port_check(sk, &sadd, SMK_RECEIVING);
4067 #endif /* SMACK_IPV6_PORT_LABELING */
4068                 break;
4069 #endif /* CONFIG_IPV6 */
4070         }
4071 
4072         return rc;
4073 }
4074 
4075 /**
4076  * smack_socket_getpeersec_stream - pull in packet label
4077  * @sock: the socket
4078  * @optval: user's destination
4079  * @optlen: size thereof
4080  * @len: max thereof
4081  *
4082  * returns zero on success, an error code otherwise
4083  */
4084 static int smack_socket_getpeersec_stream(struct socket *sock,
4085                                           char __user *optval,
4086                                           int __user *optlen, unsigned len)
4087 {
4088         struct socket_smack *ssp;
4089         char *rcp = "";
4090         int slen = 1;
4091         int rc = 0;
4092 
4093         ssp = sock->sk->sk_security;
4094         if (ssp->smk_packet != NULL) {
4095                 rcp = ssp->smk_packet->smk_known;
4096                 slen = strlen(rcp) + 1;
4097         }
4098 
4099         if (slen > len)
4100                 rc = -ERANGE;
4101         else if (copy_to_user(optval, rcp, slen) != 0)
4102                 rc = -EFAULT;
4103 
4104         if (put_user(slen, optlen) != 0)
4105                 rc = -EFAULT;
4106 
4107         return rc;
4108 }
4109 
4110 
4111 /**
4112  * smack_socket_getpeersec_dgram - pull in packet label
4113  * @sock: the peer socket
4114  * @skb: packet data
4115  * @secid: pointer to where to put the secid of the packet
4116  *
4117  * Sets the netlabel socket state on sk from parent
4118  */
4119 static int smack_socket_getpeersec_dgram(struct socket *sock,
4120                                          struct sk_buff *skb, u32 *secid)
4121 
4122 {
4123         struct netlbl_lsm_secattr secattr;
4124         struct socket_smack *ssp = NULL;
4125         struct smack_known *skp;
4126         int family = PF_UNSPEC;
4127         u32 s = 0;      /* 0 is the invalid secid */
4128         int rc;
4129 
4130         if (skb != NULL) {
4131                 if (skb->protocol == htons(ETH_P_IP))
4132                         family = PF_INET;
4133 #if IS_ENABLED(CONFIG_IPV6)
4134                 else if (skb->protocol == htons(ETH_P_IPV6))
4135                         family = PF_INET6;
4136 #endif /* CONFIG_IPV6 */
4137         }
4138         if (family == PF_UNSPEC && sock != NULL)
4139                 family = sock->sk->sk_family;
4140 
4141         switch (family) {
4142         case PF_UNIX:
4143                 ssp = sock->sk->sk_security;
4144                 s = ssp->smk_out->smk_secid;
4145                 break;
4146         case PF_INET:
4147 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4148                 s = skb->secmark;
4149                 if (s != 0)
4150                         break;
4151 #endif
4152                 /*
4153                  * Translate what netlabel gave us.
4154                  */
4155                 if (sock != NULL && sock->sk != NULL)
4156                         ssp = sock->sk->sk_security;
4157                 netlbl_secattr_init(&secattr);
4158                 rc = netlbl_skbuff_getattr(skb, family, &secattr);
4159                 if (rc == 0) {
4160                         skp = smack_from_secattr(&secattr, ssp);
4161                         s = skp->smk_secid;
4162                 }
4163                 netlbl_secattr_destroy(&secattr);
4164                 break;
4165         case PF_INET6:
4166 #ifdef SMACK_IPV6_SECMARK_LABELING
4167                 s = skb->secmark;
4168 #endif
4169                 break;
4170         }
4171         *secid = s;
4172         if (s == 0)
4173                 return -EINVAL;
4174         return 0;
4175 }
4176 
4177 /**
4178  * smack_sock_graft - Initialize a newly created socket with an existing sock
4179  * @sk: child sock
4180  * @parent: parent socket
4181  *
4182  * Set the smk_{in,out} state of an existing sock based on the process that
4183  * is creating the new socket.
4184  */
4185 static void smack_sock_graft(struct sock *sk, struct socket *parent)
4186 {
4187         struct socket_smack *ssp;
4188         struct smack_known *skp = smk_of_current();
4189 
4190         if (sk == NULL ||
4191             (sk->sk_family != PF_INET && sk->sk_family != PF_INET6))
4192                 return;
4193 
4194         ssp = sk->sk_security;
4195         ssp->smk_in = skp;
4196         ssp->smk_out = skp;
4197         /* cssp->smk_packet is already set in smack_inet_csk_clone() */
4198 }
4199 
4200 /**
4201  * smack_inet_conn_request - Smack access check on connect
4202  * @sk: socket involved
4203  * @skb: packet
4204  * @req: unused
4205  *
4206  * Returns 0 if a task with the packet label could write to
4207  * the socket, otherwise an error code
4208  */
4209 static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
4210                                    struct request_sock *req)
4211 {
4212         u16 family = sk->sk_family;
4213         struct smack_known *skp;
4214         struct socket_smack *ssp = sk->sk_security;
4215         struct netlbl_lsm_secattr secattr;
4216         struct sockaddr_in addr;
4217         struct iphdr *hdr;
4218         struct smack_known *hskp;
4219         int rc;
4220         struct smk_audit_info ad;
4221 #ifdef CONFIG_AUDIT
4222         struct lsm_network_audit net;
4223 #endif
4224 
4225 #if IS_ENABLED(CONFIG_IPV6)
4226         if (family == PF_INET6) {
4227                 /*
4228                  * Handle mapped IPv4 packets arriving
4229                  * via IPv6 sockets. Don't set up netlabel
4230                  * processing on IPv6.
4231                  */
4232                 if (skb->protocol == htons(ETH_P_IP))
4233                         family = PF_INET;
4234                 else
4235                         return 0;
4236         }
4237 #endif /* CONFIG_IPV6 */
4238 
4239 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4240         /*
4241          * If there is a secmark use it rather than the CIPSO label.
4242          * If there is no secmark fall back to CIPSO.
4243          * The secmark is assumed to reflect policy better.
4244          */
4245         if (skb && skb->secmark != 0) {
4246                 skp = smack_from_secid(skb->secmark);
4247                 goto access_check;
4248         }
4249 #endif /* CONFIG_SECURITY_SMACK_NETFILTER */
4250 
4251         netlbl_secattr_init(&secattr);
4252         rc = netlbl_skbuff_getattr(skb, family, &secattr);
4253         if (rc == 0)
4254                 skp = smack_from_secattr(&secattr, ssp);
4255         else
4256                 skp = &smack_known_huh;
4257         netlbl_secattr_destroy(&secattr);
4258 
4259 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4260 access_check:
4261 #endif
4262 
4263 #ifdef CONFIG_AUDIT
4264         smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
4265         ad.a.u.net->family = family;
4266         ad.a.u.net->netif = skb->skb_iif;
4267         ipv4_skb_to_auditdata(skb, &ad.a, NULL);
4268 #endif
4269         /*
4270          * Receiving a packet requires that the other end be able to write
4271          * here. Read access is not required.
4272          */
4273         rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
4274         rc = smk_bu_note("IPv4 connect", skp, ssp->smk_in, MAY_WRITE, rc);
4275         if (rc != 0)
4276                 return rc;
4277 
4278         /*
4279          * Save the peer's label in the request_sock so we can later setup
4280          * smk_packet in the child socket so that SO_PEERCRED can report it.
4281          */
4282         req->peer_secid = skp->smk_secid;
4283 
4284         /*
4285          * We need to decide if we want to label the incoming connection here
4286          * if we do we only need to label the request_sock and the stack will
4287          * propagate the wire-label to the sock when it is created.
4288          */
4289         hdr = ip_hdr(skb);
4290         addr.sin_addr.s_addr = hdr->saddr;
4291         rcu_read_lock();
4292         hskp = smack_ipv4host_label(&addr);
4293         rcu_read_unlock();
4294 
4295         if (hskp == NULL)
4296                 rc = netlbl_req_setattr(req, &skp->smk_netlabel);
4297         else
4298                 netlbl_req_delattr(req);
4299 
4300         return rc;
4301 }
4302 
4303 /**
4304  * smack_inet_csk_clone - Copy the connection information to the new socket
4305  * @sk: the new socket
4306  * @req: the connection's request_sock
4307  *
4308  * Transfer the connection's peer label to the newly created socket.
4309  */
4310 static void smack_inet_csk_clone(struct sock *sk,
4311                                  const struct request_sock *req)
4312 {
4313         struct socket_smack *ssp = sk->sk_security;
4314         struct smack_known *skp;
4315 
4316         if (req->peer_secid != 0) {
4317                 skp = smack_from_secid(req->peer_secid);
4318                 ssp->smk_packet = skp;
4319         } else
4320                 ssp->smk_packet = NULL;
4321 }
4322 
4323 /*
4324  * Key management security hooks
4325  *
4326  * Casey has not tested key support very heavily.
4327  * The permission check is most likely too restrictive.
4328  * If you care about keys please have a look.
4329  */
4330 #ifdef CONFIG_KEYS
4331 
4332 /**
4333  * smack_key_alloc - Set the key security blob
4334  * @key: object
4335  * @cred: the credentials to use
4336  * @flags: unused
4337  *
4338  * No allocation required
4339  *
4340  * Returns 0
4341  */
4342 static int smack_key_alloc(struct key *key, const struct cred *cred,
4343                            unsigned long flags)
4344 {
4345         struct smack_known *skp = smk_of_task(cred->security);
4346 
4347         key->security = skp;
4348         return 0;
4349 }
4350 
4351 /**
4352  * smack_key_free - Clear the key security blob
4353  * @key: the object
4354  *
4355  * Clear the blob pointer
4356  */
4357 static void smack_key_free(struct key *key)
4358 {
4359         key->security = NULL;
4360 }
4361 
4362 /**
4363  * smack_key_permission - Smack access on a key
4364  * @key_ref: gets to the object
4365  * @cred: the credentials to use
4366  * @perm: requested key permissions
4367  *
4368  * Return 0 if the task has read and write to the object,
4369  * an error code otherwise
4370  */
4371 static int smack_key_permission(key_ref_t key_ref,
4372                                 const struct cred *cred, unsigned perm)
4373 {
4374         struct key *keyp;
4375         struct smk_audit_info ad;
4376         struct smack_known *tkp = smk_of_task(cred->security);
4377         int request = 0;
4378         int rc;
4379 
4380         keyp = key_ref_to_ptr(key_ref);
4381         if (keyp == NULL)
4382                 return -EINVAL;
4383         /*
4384          * If the key hasn't been initialized give it access so that
4385          * it may do so.
4386          */
4387         if (keyp->security == NULL)
4388                 return 0;
4389         /*
4390          * This should not occur
4391          */
4392         if (tkp == NULL)
4393                 return -EACCES;
4394 #ifdef CONFIG_AUDIT
4395         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY);
4396         ad.a.u.key_struct.key = keyp->serial;
4397         ad.a.u.key_struct.key_desc = keyp->description;
4398 #endif
4399         if (perm & KEY_NEED_READ)
4400                 request = MAY_READ;
4401         if (perm & (KEY_NEED_WRITE | KEY_NEED_LINK | KEY_NEED_SETATTR))
4402                 request = MAY_WRITE;
4403         rc = smk_access(tkp, keyp->security, request, &ad);
4404         rc = smk_bu_note("key access", tkp, keyp->security, request, rc);
4405         return rc;
4406 }
4407 
4408 /*
4409  * smack_key_getsecurity - Smack label tagging the key
4410  * @key points to the key to be queried
4411  * @_buffer points to a pointer that should be set to point to the
4412  * resulting string (if no label or an error occurs).
4413  * Return the length of the string (including terminating NUL) or -ve if
4414  * an error.
4415  * May also return 0 (and a NULL buffer pointer) if there is no label.
4416  */
4417 static int smack_key_getsecurity(struct key *key, char **_buffer)
4418 {
4419         struct smack_known *skp = key->security;
4420         size_t length;
4421         char *copy;
4422 
4423         if (key->security == NULL) {
4424                 *_buffer = NULL;
4425                 return 0;
4426         }
4427 
4428         copy = kstrdup(skp->smk_known, GFP_KERNEL);
4429         if (copy == NULL)
4430                 return -ENOMEM;
4431         length = strlen(copy) + 1;
4432 
4433         *_buffer = copy;
4434         return length;
4435 }
4436 
4437 #endif /* CONFIG_KEYS */
4438 
4439 /*
4440  * Smack Audit hooks
4441  *
4442  * Audit requires a unique representation of each Smack specific
4443  * rule. This unique representation is used to distinguish the
4444  * object to be audited from remaining kernel objects and also
4445  * works as a glue between the audit hooks.
4446  *
4447  * Since repository entries are added but never deleted, we'll use
4448  * the smack_known label address related to the given audit rule as
4449  * the needed unique representation. This also better fits the smack
4450  * model where nearly everything is a label.
4451  */
4452 #ifdef CONFIG_AUDIT
4453 
4454 /**
4455  * smack_audit_rule_init - Initialize a smack audit rule
4456  * @field: audit rule fields given from user-space (audit.h)
4457  * @op: required testing operator (=, !=, >, <, ...)
4458  * @rulestr: smack label to be audited
4459  * @vrule: pointer to save our own audit rule representation
4460  *
4461  * Prepare to audit cases where (@field @op @rulestr) is true.
4462  * The label to be audited is created if necessay.
4463  */
4464 static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
4465 {
4466         struct smack_known *skp;
4467         char **rule = (char **)vrule;
4468         *rule = NULL;
4469 
4470         if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
4471                 return -EINVAL;
4472 
4473         if (op != Audit_equal && op != Audit_not_equal)
4474                 return -EINVAL;
4475 
4476         skp = smk_import_entry(rulestr, 0);
4477         if (IS_ERR(skp))
4478                 return PTR_ERR(skp);
4479 
4480         *rule = skp->smk_known;
4481 
4482         return 0;
4483 }
4484 
4485 /**
4486  * smack_audit_rule_known - Distinguish Smack audit rules
4487  * @krule: rule of interest, in Audit kernel representation format
4488  *
4489  * This is used to filter Smack rules from remaining Audit ones.
4490  * If it's proved that this rule belongs to us, the
4491  * audit_rule_match hook will be called to do the final judgement.
4492  */
4493 static int smack_audit_rule_known(struct audit_krule *krule)
4494 {
4495         struct audit_field *f;
4496         int i;
4497 
4498         for (i = 0; i < krule->field_count; i++) {
4499                 f = &krule->fields[i];
4500 
4501                 if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER)
4502                         return 1;
4503         }
4504 
4505         return 0;
4506 }
4507 
4508 /**
4509  * smack_audit_rule_match - Audit given object ?
4510  * @secid: security id for identifying the object to test
4511  * @field: audit rule flags given from user-space
4512  * @op: required testing operator
4513  * @vrule: smack internal rule presentation
4514  * @actx: audit context associated with the check
4515  *
4516  * The core Audit hook. It's used to take the decision of
4517  * whether to audit or not to audit a given object.
4518  */
4519 static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule,
4520                                   struct audit_context *actx)
4521 {
4522         struct smack_known *skp;
4523         char *rule = vrule;
4524 
4525         if (unlikely(!rule)) {
4526                 WARN_ONCE(1, "Smack: missing rule\n");
4527                 return -ENOENT;
4528         }
4529 
4530         if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
4531                 return 0;
4532 
4533         skp = smack_from_secid(secid);
4534 
4535         /*
4536          * No need to do string comparisons. If a match occurs,
4537          * both pointers will point to the same smack_known
4538          * label.
4539          */
4540         if (op == Audit_equal)
4541                 return (rule == skp->smk_known);
4542         if (op == Audit_not_equal)
4543                 return (rule != skp->smk_known);
4544 
4545         return 0;
4546 }
4547 
4548 /*
4549  * There is no need for a smack_audit_rule_free hook.
4550  * No memory was allocated.
4551  */
4552 
4553 #endif /* CONFIG_AUDIT */
4554 
4555 /**
4556  * smack_ismaclabel - check if xattr @name references a smack MAC label
4557  * @name: Full xattr name to check.
4558  */
4559 static int smack_ismaclabel(const char *name)
4560 {
4561         return (strcmp(name, XATTR_SMACK_SUFFIX) == 0);
4562 }
4563 
4564 
4565 /**
4566  * smack_secid_to_secctx - return the smack label for a secid
4567  * @secid: incoming integer
4568  * @secdata: destination
4569  * @seclen: how long it is
4570  *
4571  * Exists for networking code.
4572  */
4573 static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
4574 {
4575         struct smack_known *skp = smack_from_secid(secid);
4576 
4577         if (secdata)
4578                 *secdata = skp->smk_known;
4579         *seclen = strlen(skp->smk_known);
4580         return 0;
4581 }
4582 
4583 /**
4584  * smack_secctx_to_secid - return the secid for a smack label
4585  * @secdata: smack label
4586  * @seclen: how long result is
4587  * @secid: outgoing integer
4588  *
4589  * Exists for audit and networking code.
4590  */
4591 static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
4592 {
4593         struct smack_known *skp = smk_find_entry(secdata);
4594 
4595         if (skp)
4596                 *secid = skp->smk_secid;
4597         else
4598                 *secid = 0;
4599         return 0;
4600 }
4601 
4602 /*
4603  * There used to be a smack_release_secctx hook
4604  * that did nothing back when hooks were in a vector.
4605  * Now that there's a list such a hook adds cost.
4606  */
4607 
4608 static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
4609 {
4610         return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0);
4611 }
4612 
4613 static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
4614 {
4615         return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0);
4616 }
4617 
4618 static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
4619 {
4620         int len = 0;
4621         len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true);
4622 
4623         if (len < 0)
4624                 return len;
4625         *ctxlen = len;
4626         return 0;
4627 }
4628 
4629 static struct security_hook_list smack_hooks[] __lsm_ro_after_init = {
4630         LSM_HOOK_INIT(ptrace_access_check, smack_ptrace_access_check),
4631         LSM_HOOK_INIT(ptrace_traceme, smack_ptrace_traceme),
4632         LSM_HOOK_INIT(syslog, smack_syslog),
4633 
4634         LSM_HOOK_INIT(sb_alloc_security, smack_sb_alloc_security),
4635         LSM_HOOK_INIT(sb_free_security, smack_sb_free_security),
4636         LSM_HOOK_INIT(sb_copy_data, smack_sb_copy_data),
4637         LSM_HOOK_INIT(sb_kern_mount, smack_sb_kern_mount),
4638         LSM_HOOK_INIT(sb_statfs, smack_sb_statfs),
4639         LSM_HOOK_INIT(sb_set_mnt_opts, smack_set_mnt_opts),
4640         LSM_HOOK_INIT(sb_parse_opts_str, smack_parse_opts_str),
4641 
4642         LSM_HOOK_INIT(bprm_set_creds, smack_bprm_set_creds),
4643         LSM_HOOK_INIT(bprm_committing_creds, smack_bprm_committing_creds),
4644         LSM_HOOK_INIT(bprm_secureexec, smack_bprm_secureexec),
4645 
4646         LSM_HOOK_INIT(inode_alloc_security, smack_inode_alloc_security),
4647         LSM_HOOK_INIT(inode_free_security, smack_inode_free_security),
4648         LSM_HOOK_INIT(inode_init_security, smack_inode_init_security),
4649         LSM_HOOK_INIT(inode_link, smack_inode_link),
4650         LSM_HOOK_INIT(inode_unlink, smack_inode_unlink),
4651         LSM_HOOK_INIT(inode_rmdir, smack_inode_rmdir),
4652         LSM_HOOK_INIT(inode_rename, smack_inode_rename),
4653         LSM_HOOK_INIT(inode_permission, smack_inode_permission),
4654         LSM_HOOK_INIT(inode_setattr, smack_inode_setattr),
4655         LSM_HOOK_INIT(inode_getattr, smack_inode_getattr),
4656         LSM_HOOK_INIT(inode_setxattr, smack_inode_setxattr),
4657         LSM_HOOK_INIT(inode_post_setxattr, smack_inode_post_setxattr),
4658         LSM_HOOK_INIT(inode_getxattr, smack_inode_getxattr),
4659         LSM_HOOK_INIT(inode_removexattr, smack_inode_removexattr),
4660         LSM_HOOK_INIT(inode_getsecurity, smack_inode_getsecurity),
4661         LSM_HOOK_INIT(inode_setsecurity, smack_inode_setsecurity),
4662         LSM_HOOK_INIT(inode_listsecurity, smack_inode_listsecurity),
4663         LSM_HOOK_INIT(inode_getsecid, smack_inode_getsecid),
4664 
4665         LSM_HOOK_INIT(file_alloc_security, smack_file_alloc_security),
4666         LSM_HOOK_INIT(file_free_security, smack_file_free_security),
4667         LSM_HOOK_INIT(file_ioctl, smack_file_ioctl),
4668         LSM_HOOK_INIT(file_lock, smack_file_lock),
4669         LSM_HOOK_INIT(file_fcntl, smack_file_fcntl),
4670         LSM_HOOK_INIT(mmap_file, smack_mmap_file),
4671         LSM_HOOK_INIT(mmap_addr, cap_mmap_addr),
4672         LSM_HOOK_INIT(file_set_fowner, smack_file_set_fowner),
4673         LSM_HOOK_INIT(file_send_sigiotask, smack_file_send_sigiotask),
4674         LSM_HOOK_INIT(file_receive, smack_file_receive),
4675 
4676         LSM_HOOK_INIT(file_open, smack_file_open),
4677 
4678         LSM_HOOK_INIT(cred_alloc_blank, smack_cred_alloc_blank),
4679         LSM_HOOK_INIT(cred_free, smack_cred_free),
4680         LSM_HOOK_INIT(cred_prepare, smack_cred_prepare),
4681         LSM_HOOK_INIT(cred_transfer, smack_cred_transfer),
4682         LSM_HOOK_INIT(kernel_act_as, smack_kernel_act_as),
4683         LSM_HOOK_INIT(kernel_create_files_as, smack_kernel_create_files_as),
4684         LSM_HOOK_INIT(task_setpgid, smack_task_setpgid),
4685         LSM_HOOK_INIT(task_getpgid, smack_task_getpgid),
4686         LSM_HOOK_INIT(task_getsid, smack_task_getsid),
4687         LSM_HOOK_INIT(task_getsecid, smack_task_getsecid),
4688         LSM_HOOK_INIT(task_setnice, smack_task_setnice),
4689         LSM_HOOK_INIT(task_setioprio, smack_task_setioprio),
4690         LSM_HOOK_INIT(task_getioprio, smack_task_getioprio),
4691         LSM_HOOK_INIT(task_setscheduler, smack_task_setscheduler),
4692         LSM_HOOK_INIT(task_getscheduler, smack_task_getscheduler),
4693         LSM_HOOK_INIT(task_movememory, smack_task_movememory),
4694         LSM_HOOK_INIT(task_kill, smack_task_kill),
4695         LSM_HOOK_INIT(task_to_inode, smack_task_to_inode),
4696 
4697         LSM_HOOK_INIT(ipc_permission, smack_ipc_permission),
4698         LSM_HOOK_INIT(ipc_getsecid, smack_ipc_getsecid),
4699 
4700         LSM_HOOK_INIT(msg_msg_alloc_security, smack_msg_msg_alloc_security),
4701         LSM_HOOK_INIT(msg_msg_free_security, smack_msg_msg_free_security),
4702 
4703         LSM_HOOK_INIT(msg_queue_alloc_security, smack_msg_queue_alloc_security),
4704         LSM_HOOK_INIT(msg_queue_free_security, smack_msg_queue_free_security),
4705         LSM_HOOK_INIT(msg_queue_associate, smack_msg_queue_associate),
4706         LSM_HOOK_INIT(msg_queue_msgctl, smack_msg_queue_msgctl),
4707         LSM_HOOK_INIT(msg_queue_msgsnd, smack_msg_queue_msgsnd),
4708         LSM_HOOK_INIT(msg_queue_msgrcv, smack_msg_queue_msgrcv),
4709 
4710         LSM_HOOK_INIT(shm_alloc_security, smack_shm_alloc_security),
4711         LSM_HOOK_INIT(shm_free_security, smack_shm_free_security),
4712         LSM_HOOK_INIT(shm_associate, smack_shm_associate),
4713         LSM_HOOK_INIT(shm_shmctl, smack_shm_shmctl),
4714         LSM_HOOK_INIT(shm_shmat, smack_shm_shmat),
4715 
4716         LSM_HOOK_INIT(sem_alloc_security, smack_sem_alloc_security),
4717         LSM_HOOK_INIT(sem_free_security, smack_sem_free_security),
4718         LSM_HOOK_INIT(sem_associate, smack_sem_associate),
4719         LSM_HOOK_INIT(sem_semctl, smack_sem_semctl),
4720         LSM_HOOK_INIT(sem_semop, smack_sem_semop),
4721 
4722         LSM_HOOK_INIT(d_instantiate, smack_d_instantiate),
4723 
4724         LSM_HOOK_INIT(getprocattr, smack_getprocattr),
4725         LSM_HOOK_INIT(setprocattr, smack_setprocattr),
4726 
4727         LSM_HOOK_INIT(unix_stream_connect, smack_unix_stream_connect),
4728         LSM_HOOK_INIT(unix_may_send, smack_unix_may_send),
4729 
4730         LSM_HOOK_INIT(socket_post_create, smack_socket_post_create),
4731 #ifdef SMACK_IPV6_PORT_LABELING
4732         LSM_HOOK_INIT(socket_bind, smack_socket_bind),
4733 #endif
4734         LSM_HOOK_INIT(socket_connect, smack_socket_connect),
4735         LSM_HOOK_INIT(socket_sendmsg, smack_socket_sendmsg),
4736         LSM_HOOK_INIT(socket_sock_rcv_skb, smack_socket_sock_rcv_skb),
4737         LSM_HOOK_INIT(socket_getpeersec_stream, smack_socket_getpeersec_stream),
4738         LSM_HOOK_INIT(socket_getpeersec_dgram, smack_socket_getpeersec_dgram),
4739         LSM_HOOK_INIT(sk_alloc_security, smack_sk_alloc_security),
4740         LSM_HOOK_INIT(sk_free_security, smack_sk_free_security),
4741         LSM_HOOK_INIT(sock_graft, smack_sock_graft),
4742         LSM_HOOK_INIT(inet_conn_request, smack_inet_conn_request),
4743         LSM_HOOK_INIT(inet_csk_clone, smack_inet_csk_clone),
4744 
4745  /* key management security hooks */
4746 #ifdef CONFIG_KEYS
4747         LSM_HOOK_INIT(key_alloc, smack_key_alloc),
4748         LSM_HOOK_INIT(key_free, smack_key_free),
4749         LSM_HOOK_INIT(key_permission, smack_key_permission),
4750         LSM_HOOK_INIT(key_getsecurity, smack_key_getsecurity),
4751 #endif /* CONFIG_KEYS */
4752 
4753  /* Audit hooks */
4754 #ifdef CONFIG_AUDIT
4755         LSM_HOOK_INIT(audit_rule_init, smack_audit_rule_init),
4756         LSM_HOOK_INIT(audit_rule_known, smack_audit_rule_known),
4757         LSM_HOOK_INIT(audit_rule_match, smack_audit_rule_match),
4758 #endif /* CONFIG_AUDIT */
4759 
4760         LSM_HOOK_INIT(ismaclabel, smack_ismaclabel),
4761         LSM_HOOK_INIT(secid_to_secctx, smack_secid_to_secctx),
4762         LSM_HOOK_INIT(secctx_to_secid, smack_secctx_to_secid),
4763         LSM_HOOK_INIT(inode_notifysecctx, smack_inode_notifysecctx),
4764         LSM_HOOK_INIT(inode_setsecctx, smack_inode_setsecctx),
4765         LSM_HOOK_INIT(inode_getsecctx, smack_inode_getsecctx),
4766 };
4767 
4768 
4769 static __init void init_smack_known_list(void)
4770 {
4771         /*
4772          * Initialize rule list locks
4773          */
4774         mutex_init(&smack_known_huh.smk_rules_lock);
4775         mutex_init(&smack_known_hat.smk_rules_lock);
4776         mutex_init(&smack_known_floor.smk_rules_lock);
4777         mutex_init(&smack_known_star.smk_rules_lock);
4778         mutex_init(&smack_known_web.smk_rules_lock);
4779         /*
4780          * Initialize rule lists
4781          */
4782         INIT_LIST_HEAD(&smack_known_huh.smk_rules);
4783         INIT_LIST_HEAD(&smack_known_hat.smk_rules);
4784         INIT_LIST_HEAD(&smack_known_star.smk_rules);
4785         INIT_LIST_HEAD(&smack_known_floor.smk_rules);
4786         INIT_LIST_HEAD(&smack_known_web.smk_rules);
4787         /*
4788          * Create the known labels list
4789          */
4790         smk_insert_entry(&smack_known_huh);
4791         smk_insert_entry(&smack_known_hat);
4792         smk_insert_entry(&smack_known_star);
4793         smk_insert_entry(&smack_known_floor);
4794         smk_insert_entry(&smack_known_web);
4795 }
4796 
4797 /**
4798  * smack_init - initialize the smack system
4799  *
4800  * Returns 0
4801  */
4802 static __init int smack_init(void)
4803 {
4804         struct cred *cred;
4805         struct task_smack *tsp;
4806 
4807         if (!security_module_enable("smack"))
4808                 return 0;
4809 
4810         smack_inode_cache = KMEM_CACHE(inode_smack, 0);
4811         if (!smack_inode_cache)
4812                 return -ENOMEM;
4813 
4814         tsp = new_task_smack(&smack_known_floor, &smack_known_floor,
4815                                 GFP_KERNEL);
4816         if (tsp == NULL) {
4817                 kmem_cache_destroy(smack_inode_cache);
4818                 return -ENOMEM;
4819         }
4820 
4821         smack_enabled = 1;
4822 
4823         pr_info("Smack:  Initializing.\n");
4824 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4825         pr_info("Smack:  Netfilter enabled.\n");
4826 #endif
4827 #ifdef SMACK_IPV6_PORT_LABELING
4828         pr_info("Smack:  IPv6 port labeling enabled.\n");
4829 #endif
4830 #ifdef SMACK_IPV6_SECMARK_LABELING
4831         pr_info("Smack:  IPv6 Netfilter enabled.\n");
4832 #endif
4833 
4834         /*
4835          * Set the security state for the initial task.
4836          */
4837         cred = (struct cred *) current->cred;
4838         cred->security = tsp;
4839 
4840         /* initialize the smack_known_list */
4841         init_smack_known_list();
4842 
4843         /*
4844          * Register with LSM
4845          */
4846         security_add_hooks(smack_hooks, ARRAY_SIZE(smack_hooks), "smack");
4847 
4848         return 0;
4849 }
4850 
4851 /*
4852  * Smack requires early initialization in order to label
4853  * all processes and objects when they are created.
4854  */
4855 security_initcall(smack_init);
4856 

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