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TOMOYO Linux Cross Reference
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/slab.h>
 31 #include <linux/mutex.h>
 32 #include <linux/pipe_fs_i.h>
 33 #include <net/cipso_ipv4.h>
 34 #include <linux/audit.h>
 35 #include <linux/magic.h>
 36 #include <linux/dcache.h>
 37 #include <linux/personality.h>
 38 #include <linux/msg.h>
 39 #include <linux/shm.h>
 40 #include <linux/binfmts.h>
 41 #include "smack.h"
 42 
 43 #define task_security(task)     (task_cred_xxx((task), security))
 44 
 45 #define TRANS_TRUE      "TRUE"
 46 #define TRANS_TRUE_SIZE 4
 47 
 48 /**
 49  * smk_fetch - Fetch the smack label from a file.
 50  * @ip: a pointer to the inode
 51  * @dp: a pointer to the dentry
 52  *
 53  * Returns a pointer to the master list entry for the Smack label
 54  * or NULL if there was no label to fetch.
 55  */
 56 static char *smk_fetch(const char *name, struct inode *ip, struct dentry *dp)
 57 {
 58         int rc;
 59         char *buffer;
 60         char *result = NULL;
 61 
 62         if (ip->i_op->getxattr == NULL)
 63                 return NULL;
 64 
 65         buffer = kzalloc(SMK_LONGLABEL, GFP_KERNEL);
 66         if (buffer == NULL)
 67                 return NULL;
 68 
 69         rc = ip->i_op->getxattr(dp, name, buffer, SMK_LONGLABEL);
 70         if (rc > 0)
 71                 result = smk_import(buffer, rc);
 72 
 73         kfree(buffer);
 74 
 75         return result;
 76 }
 77 
 78 /**
 79  * new_inode_smack - allocate an inode security blob
 80  * @smack: a pointer to the Smack label to use in the blob
 81  *
 82  * Returns the new blob or NULL if there's no memory available
 83  */
 84 struct inode_smack *new_inode_smack(char *smack)
 85 {
 86         struct inode_smack *isp;
 87 
 88         isp = kzalloc(sizeof(struct inode_smack), GFP_NOFS);
 89         if (isp == NULL)
 90                 return NULL;
 91 
 92         isp->smk_inode = smack;
 93         isp->smk_flags = 0;
 94         mutex_init(&isp->smk_lock);
 95 
 96         return isp;
 97 }
 98 
 99 /**
100  * new_task_smack - allocate a task security blob
101  * @smack: a pointer to the Smack label to use in the blob
102  *
103  * Returns the new blob or NULL if there's no memory available
104  */
105 static struct task_smack *new_task_smack(char *task, char *forked, gfp_t gfp)
106 {
107         struct task_smack *tsp;
108 
109         tsp = kzalloc(sizeof(struct task_smack), gfp);
110         if (tsp == NULL)
111                 return NULL;
112 
113         tsp->smk_task = task;
114         tsp->smk_forked = forked;
115         INIT_LIST_HEAD(&tsp->smk_rules);
116         mutex_init(&tsp->smk_rules_lock);
117 
118         return tsp;
119 }
120 
121 /**
122  * smk_copy_rules - copy a rule set
123  * @nhead - new rules header pointer
124  * @ohead - old rules header pointer
125  *
126  * Returns 0 on success, -ENOMEM on error
127  */
128 static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead,
129                                 gfp_t gfp)
130 {
131         struct smack_rule *nrp;
132         struct smack_rule *orp;
133         int rc = 0;
134 
135         INIT_LIST_HEAD(nhead);
136 
137         list_for_each_entry_rcu(orp, ohead, list) {
138                 nrp = kzalloc(sizeof(struct smack_rule), gfp);
139                 if (nrp == NULL) {
140                         rc = -ENOMEM;
141                         break;
142                 }
143                 *nrp = *orp;
144                 list_add_rcu(&nrp->list, nhead);
145         }
146         return rc;
147 }
148 
149 /*
150  * LSM hooks.
151  * We he, that is fun!
152  */
153 
154 /**
155  * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH
156  * @ctp: child task pointer
157  * @mode: ptrace attachment mode
158  *
159  * Returns 0 if access is OK, an error code otherwise
160  *
161  * Do the capability checks, and require read and write.
162  */
163 static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode)
164 {
165         int rc;
166         struct smk_audit_info ad;
167         char *tsp;
168 
169         rc = cap_ptrace_access_check(ctp, mode);
170         if (rc != 0)
171                 return rc;
172 
173         tsp = smk_of_task(task_security(ctp));
174         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
175         smk_ad_setfield_u_tsk(&ad, ctp);
176 
177         rc = smk_curacc(tsp, MAY_READWRITE, &ad);
178         return rc;
179 }
180 
181 /**
182  * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME
183  * @ptp: parent task pointer
184  *
185  * Returns 0 if access is OK, an error code otherwise
186  *
187  * Do the capability checks, and require read and write.
188  */
189 static int smack_ptrace_traceme(struct task_struct *ptp)
190 {
191         int rc;
192         struct smk_audit_info ad;
193         char *tsp;
194 
195         rc = cap_ptrace_traceme(ptp);
196         if (rc != 0)
197                 return rc;
198 
199         tsp = smk_of_task(task_security(ptp));
200         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
201         smk_ad_setfield_u_tsk(&ad, ptp);
202 
203         rc = smk_curacc(tsp, MAY_READWRITE, &ad);
204         return rc;
205 }
206 
207 /**
208  * smack_syslog - Smack approval on syslog
209  * @type: message type
210  *
211  * Require that the task has the floor label
212  *
213  * Returns 0 on success, error code otherwise.
214  */
215 static int smack_syslog(int typefrom_file)
216 {
217         int rc = 0;
218         char *sp = smk_of_current();
219 
220         if (smack_privileged(CAP_MAC_OVERRIDE))
221                 return 0;
222 
223          if (sp != smack_known_floor.smk_known)
224                 rc = -EACCES;
225 
226         return rc;
227 }
228 
229 
230 /*
231  * Superblock Hooks.
232  */
233 
234 /**
235  * smack_sb_alloc_security - allocate a superblock blob
236  * @sb: the superblock getting the blob
237  *
238  * Returns 0 on success or -ENOMEM on error.
239  */
240 static int smack_sb_alloc_security(struct super_block *sb)
241 {
242         struct superblock_smack *sbsp;
243 
244         sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL);
245 
246         if (sbsp == NULL)
247                 return -ENOMEM;
248 
249         sbsp->smk_root = smack_known_floor.smk_known;
250         sbsp->smk_default = smack_known_floor.smk_known;
251         sbsp->smk_floor = smack_known_floor.smk_known;
252         sbsp->smk_hat = smack_known_hat.smk_known;
253         sbsp->smk_initialized = 0;
254 
255         sb->s_security = sbsp;
256 
257         return 0;
258 }
259 
260 /**
261  * smack_sb_free_security - free a superblock blob
262  * @sb: the superblock getting the blob
263  *
264  */
265 static void smack_sb_free_security(struct super_block *sb)
266 {
267         kfree(sb->s_security);
268         sb->s_security = NULL;
269 }
270 
271 /**
272  * smack_sb_copy_data - copy mount options data for processing
273  * @orig: where to start
274  * @smackopts: mount options string
275  *
276  * Returns 0 on success or -ENOMEM on error.
277  *
278  * Copy the Smack specific mount options out of the mount
279  * options list.
280  */
281 static int smack_sb_copy_data(char *orig, char *smackopts)
282 {
283         char *cp, *commap, *otheropts, *dp;
284 
285         otheropts = (char *)get_zeroed_page(GFP_KERNEL);
286         if (otheropts == NULL)
287                 return -ENOMEM;
288 
289         for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) {
290                 if (strstr(cp, SMK_FSDEFAULT) == cp)
291                         dp = smackopts;
292                 else if (strstr(cp, SMK_FSFLOOR) == cp)
293                         dp = smackopts;
294                 else if (strstr(cp, SMK_FSHAT) == cp)
295                         dp = smackopts;
296                 else if (strstr(cp, SMK_FSROOT) == cp)
297                         dp = smackopts;
298                 else
299                         dp = otheropts;
300 
301                 commap = strchr(cp, ',');
302                 if (commap != NULL)
303                         *commap = '\0';
304 
305                 if (*dp != '\0')
306                         strcat(dp, ",");
307                 strcat(dp, cp);
308         }
309 
310         strcpy(orig, otheropts);
311         free_page((unsigned long)otheropts);
312 
313         return 0;
314 }
315 
316 /**
317  * smack_sb_kern_mount - Smack specific mount processing
318  * @sb: the file system superblock
319  * @flags: the mount flags
320  * @data: the smack mount options
321  *
322  * Returns 0 on success, an error code on failure
323  */
324 static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data)
325 {
326         struct dentry *root = sb->s_root;
327         struct inode *inode = root->d_inode;
328         struct superblock_smack *sp = sb->s_security;
329         struct inode_smack *isp;
330         char *op;
331         char *commap;
332         char *nsp;
333 
334         if (sp->smk_initialized != 0)
335                 return 0;
336 
337         sp->smk_initialized = 1;
338 
339         for (op = data; op != NULL; op = commap) {
340                 commap = strchr(op, ',');
341                 if (commap != NULL)
342                         *commap++ = '\0';
343 
344                 if (strncmp(op, SMK_FSHAT, strlen(SMK_FSHAT)) == 0) {
345                         op += strlen(SMK_FSHAT);
346                         nsp = smk_import(op, 0);
347                         if (nsp != NULL)
348                                 sp->smk_hat = nsp;
349                 } else if (strncmp(op, SMK_FSFLOOR, strlen(SMK_FSFLOOR)) == 0) {
350                         op += strlen(SMK_FSFLOOR);
351                         nsp = smk_import(op, 0);
352                         if (nsp != NULL)
353                                 sp->smk_floor = nsp;
354                 } else if (strncmp(op, SMK_FSDEFAULT,
355                                    strlen(SMK_FSDEFAULT)) == 0) {
356                         op += strlen(SMK_FSDEFAULT);
357                         nsp = smk_import(op, 0);
358                         if (nsp != NULL)
359                                 sp->smk_default = nsp;
360                 } else if (strncmp(op, SMK_FSROOT, strlen(SMK_FSROOT)) == 0) {
361                         op += strlen(SMK_FSROOT);
362                         nsp = smk_import(op, 0);
363                         if (nsp != NULL)
364                                 sp->smk_root = nsp;
365                 }
366         }
367 
368         /*
369          * Initialize the root inode.
370          */
371         isp = inode->i_security;
372         if (isp == NULL)
373                 inode->i_security = new_inode_smack(sp->smk_root);
374         else
375                 isp->smk_inode = sp->smk_root;
376 
377         return 0;
378 }
379 
380 /**
381  * smack_sb_statfs - Smack check on statfs
382  * @dentry: identifies the file system in question
383  *
384  * Returns 0 if current can read the floor of the filesystem,
385  * and error code otherwise
386  */
387 static int smack_sb_statfs(struct dentry *dentry)
388 {
389         struct superblock_smack *sbp = dentry->d_sb->s_security;
390         int rc;
391         struct smk_audit_info ad;
392 
393         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
394         smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
395 
396         rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad);
397         return rc;
398 }
399 
400 /**
401  * smack_sb_mount - Smack check for mounting
402  * @dev_name: unused
403  * @path: mount point
404  * @type: unused
405  * @flags: unused
406  * @data: unused
407  *
408  * Returns 0 if current can write the floor of the filesystem
409  * being mounted on, an error code otherwise.
410  */
411 static int smack_sb_mount(const char *dev_name, struct path *path,
412                           const char *type, unsigned long flags, void *data)
413 {
414         struct superblock_smack *sbp = path->dentry->d_sb->s_security;
415         struct smk_audit_info ad;
416 
417         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
418         smk_ad_setfield_u_fs_path(&ad, *path);
419 
420         return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad);
421 }
422 
423 /**
424  * smack_sb_umount - Smack check for unmounting
425  * @mnt: file system to unmount
426  * @flags: unused
427  *
428  * Returns 0 if current can write the floor of the filesystem
429  * being unmounted, an error code otherwise.
430  */
431 static int smack_sb_umount(struct vfsmount *mnt, int flags)
432 {
433         struct superblock_smack *sbp;
434         struct smk_audit_info ad;
435         struct path path;
436 
437         path.dentry = mnt->mnt_root;
438         path.mnt = mnt;
439 
440         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
441         smk_ad_setfield_u_fs_path(&ad, path);
442 
443         sbp = path.dentry->d_sb->s_security;
444         return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad);
445 }
446 
447 /*
448  * BPRM hooks
449  */
450 
451 /**
452  * smack_bprm_set_creds - set creds for exec
453  * @bprm: the exec information
454  *
455  * Returns 0 if it gets a blob, -ENOMEM otherwise
456  */
457 static int smack_bprm_set_creds(struct linux_binprm *bprm)
458 {
459         struct inode *inode = file_inode(bprm->file);
460         struct task_smack *bsp = bprm->cred->security;
461         struct inode_smack *isp;
462         int rc;
463 
464         rc = cap_bprm_set_creds(bprm);
465         if (rc != 0)
466                 return rc;
467 
468         if (bprm->cred_prepared)
469                 return 0;
470 
471         isp = inode->i_security;
472         if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task)
473                 return 0;
474 
475         if (bprm->unsafe)
476                 return -EPERM;
477 
478         bsp->smk_task = isp->smk_task;
479         bprm->per_clear |= PER_CLEAR_ON_SETID;
480 
481         return 0;
482 }
483 
484 /**
485  * smack_bprm_committing_creds - Prepare to install the new credentials
486  * from bprm.
487  *
488  * @bprm: binprm for exec
489  */
490 static void smack_bprm_committing_creds(struct linux_binprm *bprm)
491 {
492         struct task_smack *bsp = bprm->cred->security;
493 
494         if (bsp->smk_task != bsp->smk_forked)
495                 current->pdeath_signal = 0;
496 }
497 
498 /**
499  * smack_bprm_secureexec - Return the decision to use secureexec.
500  * @bprm: binprm for exec
501  *
502  * Returns 0 on success.
503  */
504 static int smack_bprm_secureexec(struct linux_binprm *bprm)
505 {
506         struct task_smack *tsp = current_security();
507         int ret = cap_bprm_secureexec(bprm);
508 
509         if (!ret && (tsp->smk_task != tsp->smk_forked))
510                 ret = 1;
511 
512         return ret;
513 }
514 
515 /*
516  * Inode hooks
517  */
518 
519 /**
520  * smack_inode_alloc_security - allocate an inode blob
521  * @inode: the inode in need of a blob
522  *
523  * Returns 0 if it gets a blob, -ENOMEM otherwise
524  */
525 static int smack_inode_alloc_security(struct inode *inode)
526 {
527         inode->i_security = new_inode_smack(smk_of_current());
528         if (inode->i_security == NULL)
529                 return -ENOMEM;
530         return 0;
531 }
532 
533 /**
534  * smack_inode_free_security - free an inode blob
535  * @inode: the inode with a blob
536  *
537  * Clears the blob pointer in inode
538  */
539 static void smack_inode_free_security(struct inode *inode)
540 {
541         kfree(inode->i_security);
542         inode->i_security = NULL;
543 }
544 
545 /**
546  * smack_inode_init_security - copy out the smack from an inode
547  * @inode: the inode
548  * @dir: unused
549  * @qstr: unused
550  * @name: where to put the attribute name
551  * @value: where to put the attribute value
552  * @len: where to put the length of the attribute
553  *
554  * Returns 0 if it all works out, -ENOMEM if there's no memory
555  */
556 static int smack_inode_init_security(struct inode *inode, struct inode *dir,
557                                      const struct qstr *qstr, char **name,
558                                      void **value, size_t *len)
559 {
560         struct smack_known *skp;
561         struct inode_smack *issp = inode->i_security;
562         char *csp = smk_of_current();
563         char *isp = smk_of_inode(inode);
564         char *dsp = smk_of_inode(dir);
565         int may;
566 
567         if (name) {
568                 *name = kstrdup(XATTR_SMACK_SUFFIX, GFP_NOFS);
569                 if (*name == NULL)
570                         return -ENOMEM;
571         }
572 
573         if (value) {
574                 skp = smk_find_entry(csp);
575                 rcu_read_lock();
576                 may = smk_access_entry(csp, dsp, &skp->smk_rules);
577                 rcu_read_unlock();
578 
579                 /*
580                  * If the access rule allows transmutation and
581                  * the directory requests transmutation then
582                  * by all means transmute.
583                  * Mark the inode as changed.
584                  */
585                 if (may > 0 && ((may & MAY_TRANSMUTE) != 0) &&
586                     smk_inode_transmutable(dir)) {
587                         isp = dsp;
588                         issp->smk_flags |= SMK_INODE_CHANGED;
589                 }
590 
591                 *value = kstrdup(isp, GFP_NOFS);
592                 if (*value == NULL)
593                         return -ENOMEM;
594         }
595 
596         if (len)
597                 *len = strlen(isp) + 1;
598 
599         return 0;
600 }
601 
602 /**
603  * smack_inode_link - Smack check on link
604  * @old_dentry: the existing object
605  * @dir: unused
606  * @new_dentry: the new object
607  *
608  * Returns 0 if access is permitted, an error code otherwise
609  */
610 static int smack_inode_link(struct dentry *old_dentry, struct inode *dir,
611                             struct dentry *new_dentry)
612 {
613         char *isp;
614         struct smk_audit_info ad;
615         int rc;
616 
617         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
618         smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
619 
620         isp = smk_of_inode(old_dentry->d_inode);
621         rc = smk_curacc(isp, MAY_WRITE, &ad);
622 
623         if (rc == 0 && new_dentry->d_inode != NULL) {
624                 isp = smk_of_inode(new_dentry->d_inode);
625                 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
626                 rc = smk_curacc(isp, MAY_WRITE, &ad);
627         }
628 
629         return rc;
630 }
631 
632 /**
633  * smack_inode_unlink - Smack check on inode deletion
634  * @dir: containing directory object
635  * @dentry: file to unlink
636  *
637  * Returns 0 if current can write the containing directory
638  * and the object, error code otherwise
639  */
640 static int smack_inode_unlink(struct inode *dir, struct dentry *dentry)
641 {
642         struct inode *ip = dentry->d_inode;
643         struct smk_audit_info ad;
644         int rc;
645 
646         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
647         smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
648 
649         /*
650          * You need write access to the thing you're unlinking
651          */
652         rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad);
653         if (rc == 0) {
654                 /*
655                  * You also need write access to the containing directory
656                  */
657                 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
658                 smk_ad_setfield_u_fs_inode(&ad, dir);
659                 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
660         }
661         return rc;
662 }
663 
664 /**
665  * smack_inode_rmdir - Smack check on directory deletion
666  * @dir: containing directory object
667  * @dentry: directory to unlink
668  *
669  * Returns 0 if current can write the containing directory
670  * and the directory, error code otherwise
671  */
672 static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry)
673 {
674         struct smk_audit_info ad;
675         int rc;
676 
677         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
678         smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
679 
680         /*
681          * You need write access to the thing you're removing
682          */
683         rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
684         if (rc == 0) {
685                 /*
686                  * You also need write access to the containing directory
687                  */
688                 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
689                 smk_ad_setfield_u_fs_inode(&ad, dir);
690                 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
691         }
692 
693         return rc;
694 }
695 
696 /**
697  * smack_inode_rename - Smack check on rename
698  * @old_inode: the old directory
699  * @old_dentry: unused
700  * @new_inode: the new directory
701  * @new_dentry: unused
702  *
703  * Read and write access is required on both the old and
704  * new directories.
705  *
706  * Returns 0 if access is permitted, an error code otherwise
707  */
708 static int smack_inode_rename(struct inode *old_inode,
709                               struct dentry *old_dentry,
710                               struct inode *new_inode,
711                               struct dentry *new_dentry)
712 {
713         int rc;
714         char *isp;
715         struct smk_audit_info ad;
716 
717         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
718         smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
719 
720         isp = smk_of_inode(old_dentry->d_inode);
721         rc = smk_curacc(isp, MAY_READWRITE, &ad);
722 
723         if (rc == 0 && new_dentry->d_inode != NULL) {
724                 isp = smk_of_inode(new_dentry->d_inode);
725                 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
726                 rc = smk_curacc(isp, MAY_READWRITE, &ad);
727         }
728         return rc;
729 }
730 
731 /**
732  * smack_inode_permission - Smack version of permission()
733  * @inode: the inode in question
734  * @mask: the access requested
735  *
736  * This is the important Smack hook.
737  *
738  * Returns 0 if access is permitted, -EACCES otherwise
739  */
740 static int smack_inode_permission(struct inode *inode, int mask)
741 {
742         struct smk_audit_info ad;
743         int no_block = mask & MAY_NOT_BLOCK;
744 
745         mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND);
746         /*
747          * No permission to check. Existence test. Yup, it's there.
748          */
749         if (mask == 0)
750                 return 0;
751 
752         /* May be droppable after audit */
753         if (no_block)
754                 return -ECHILD;
755         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
756         smk_ad_setfield_u_fs_inode(&ad, inode);
757         return smk_curacc(smk_of_inode(inode), mask, &ad);
758 }
759 
760 /**
761  * smack_inode_setattr - Smack check for setting attributes
762  * @dentry: the object
763  * @iattr: for the force flag
764  *
765  * Returns 0 if access is permitted, an error code otherwise
766  */
767 static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr)
768 {
769         struct smk_audit_info ad;
770         /*
771          * Need to allow for clearing the setuid bit.
772          */
773         if (iattr->ia_valid & ATTR_FORCE)
774                 return 0;
775         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
776         smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
777 
778         return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
779 }
780 
781 /**
782  * smack_inode_getattr - Smack check for getting attributes
783  * @mnt: unused
784  * @dentry: the object
785  *
786  * Returns 0 if access is permitted, an error code otherwise
787  */
788 static int smack_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
789 {
790         struct smk_audit_info ad;
791         struct path path;
792 
793         path.dentry = dentry;
794         path.mnt = mnt;
795 
796         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
797         smk_ad_setfield_u_fs_path(&ad, path);
798         return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad);
799 }
800 
801 /**
802  * smack_inode_setxattr - Smack check for setting xattrs
803  * @dentry: the object
804  * @name: name of the attribute
805  * @value: unused
806  * @size: unused
807  * @flags: unused
808  *
809  * This protects the Smack attribute explicitly.
810  *
811  * Returns 0 if access is permitted, an error code otherwise
812  */
813 static int smack_inode_setxattr(struct dentry *dentry, const char *name,
814                                 const void *value, size_t size, int flags)
815 {
816         struct smk_audit_info ad;
817         int rc = 0;
818 
819         if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
820             strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
821             strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
822             strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
823             strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
824                 if (!smack_privileged(CAP_MAC_ADMIN))
825                         rc = -EPERM;
826                 /*
827                  * check label validity here so import wont fail on
828                  * post_setxattr
829                  */
830                 if (size == 0 || size >= SMK_LONGLABEL ||
831                     smk_import(value, size) == NULL)
832                         rc = -EINVAL;
833         } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
834                 if (!smack_privileged(CAP_MAC_ADMIN))
835                         rc = -EPERM;
836                 if (size != TRANS_TRUE_SIZE ||
837                     strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0)
838                         rc = -EINVAL;
839         } else
840                 rc = cap_inode_setxattr(dentry, name, value, size, flags);
841 
842         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
843         smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
844 
845         if (rc == 0)
846                 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
847 
848         return rc;
849 }
850 
851 /**
852  * smack_inode_post_setxattr - Apply the Smack update approved above
853  * @dentry: object
854  * @name: attribute name
855  * @value: attribute value
856  * @size: attribute size
857  * @flags: unused
858  *
859  * Set the pointer in the inode blob to the entry found
860  * in the master label list.
861  */
862 static void smack_inode_post_setxattr(struct dentry *dentry, const char *name,
863                                       const void *value, size_t size, int flags)
864 {
865         char *nsp;
866         struct inode_smack *isp = dentry->d_inode->i_security;
867 
868         if (strcmp(name, XATTR_NAME_SMACK) == 0) {
869                 nsp = smk_import(value, size);
870                 if (nsp != NULL)
871                         isp->smk_inode = nsp;
872                 else
873                         isp->smk_inode = smack_known_invalid.smk_known;
874         } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) {
875                 nsp = smk_import(value, size);
876                 if (nsp != NULL)
877                         isp->smk_task = nsp;
878                 else
879                         isp->smk_task = smack_known_invalid.smk_known;
880         } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
881                 nsp = smk_import(value, size);
882                 if (nsp != NULL)
883                         isp->smk_mmap = nsp;
884                 else
885                         isp->smk_mmap = smack_known_invalid.smk_known;
886         } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0)
887                 isp->smk_flags |= SMK_INODE_TRANSMUTE;
888 
889         return;
890 }
891 
892 /**
893  * smack_inode_getxattr - Smack check on getxattr
894  * @dentry: the object
895  * @name: unused
896  *
897  * Returns 0 if access is permitted, an error code otherwise
898  */
899 static int smack_inode_getxattr(struct dentry *dentry, const char *name)
900 {
901         struct smk_audit_info ad;
902 
903         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
904         smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
905 
906         return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad);
907 }
908 
909 /**
910  * smack_inode_removexattr - Smack check on removexattr
911  * @dentry: the object
912  * @name: name of the attribute
913  *
914  * Removing the Smack attribute requires CAP_MAC_ADMIN
915  *
916  * Returns 0 if access is permitted, an error code otherwise
917  */
918 static int smack_inode_removexattr(struct dentry *dentry, const char *name)
919 {
920         struct inode_smack *isp;
921         struct smk_audit_info ad;
922         int rc = 0;
923 
924         if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
925             strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
926             strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
927             strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
928             strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 ||
929             strcmp(name, XATTR_NAME_SMACKMMAP)) {
930                 if (!smack_privileged(CAP_MAC_ADMIN))
931                         rc = -EPERM;
932         } else
933                 rc = cap_inode_removexattr(dentry, name);
934 
935         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
936         smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
937         if (rc == 0)
938                 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
939 
940         if (rc == 0) {
941                 isp = dentry->d_inode->i_security;
942                 isp->smk_task = NULL;
943                 isp->smk_mmap = NULL;
944         }
945 
946         return rc;
947 }
948 
949 /**
950  * smack_inode_getsecurity - get smack xattrs
951  * @inode: the object
952  * @name: attribute name
953  * @buffer: where to put the result
954  * @alloc: unused
955  *
956  * Returns the size of the attribute or an error code
957  */
958 static int smack_inode_getsecurity(const struct inode *inode,
959                                    const char *name, void **buffer,
960                                    bool alloc)
961 {
962         struct socket_smack *ssp;
963         struct socket *sock;
964         struct super_block *sbp;
965         struct inode *ip = (struct inode *)inode;
966         char *isp;
967         int ilen;
968         int rc = 0;
969 
970         if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
971                 isp = smk_of_inode(inode);
972                 ilen = strlen(isp) + 1;
973                 *buffer = isp;
974                 return ilen;
975         }
976 
977         /*
978          * The rest of the Smack xattrs are only on sockets.
979          */
980         sbp = ip->i_sb;
981         if (sbp->s_magic != SOCKFS_MAGIC)
982                 return -EOPNOTSUPP;
983 
984         sock = SOCKET_I(ip);
985         if (sock == NULL || sock->sk == NULL)
986                 return -EOPNOTSUPP;
987 
988         ssp = sock->sk->sk_security;
989 
990         if (strcmp(name, XATTR_SMACK_IPIN) == 0)
991                 isp = ssp->smk_in;
992         else if (strcmp(name, XATTR_SMACK_IPOUT) == 0)
993                 isp = ssp->smk_out;
994         else
995                 return -EOPNOTSUPP;
996 
997         ilen = strlen(isp) + 1;
998         if (rc == 0) {
999                 *buffer = isp;
1000                 rc = ilen;
1001         }
1002 
1003         return rc;
1004 }
1005 
1006 
1007 /**
1008  * smack_inode_listsecurity - list the Smack attributes
1009  * @inode: the object
1010  * @buffer: where they go
1011  * @buffer_size: size of buffer
1012  *
1013  * Returns 0 on success, -EINVAL otherwise
1014  */
1015 static int smack_inode_listsecurity(struct inode *inode, char *buffer,
1016                                     size_t buffer_size)
1017 {
1018         int len = strlen(XATTR_NAME_SMACK);
1019 
1020         if (buffer != NULL && len <= buffer_size) {
1021                 memcpy(buffer, XATTR_NAME_SMACK, len);
1022                 return len;
1023         }
1024         return -EINVAL;
1025 }
1026 
1027 /**
1028  * smack_inode_getsecid - Extract inode's security id
1029  * @inode: inode to extract the info from
1030  * @secid: where result will be saved
1031  */
1032 static void smack_inode_getsecid(const struct inode *inode, u32 *secid)
1033 {
1034         struct inode_smack *isp = inode->i_security;
1035 
1036         *secid = smack_to_secid(isp->smk_inode);
1037 }
1038 
1039 /*
1040  * File Hooks
1041  */
1042 
1043 /**
1044  * smack_file_permission - Smack check on file operations
1045  * @file: unused
1046  * @mask: unused
1047  *
1048  * Returns 0
1049  *
1050  * Should access checks be done on each read or write?
1051  * UNICOS and SELinux say yes.
1052  * Trusted Solaris, Trusted Irix, and just about everyone else says no.
1053  *
1054  * I'll say no for now. Smack does not do the frequent
1055  * label changing that SELinux does.
1056  */
1057 static int smack_file_permission(struct file *file, int mask)
1058 {
1059         return 0;
1060 }
1061 
1062 /**
1063  * smack_file_alloc_security - assign a file security blob
1064  * @file: the object
1065  *
1066  * The security blob for a file is a pointer to the master
1067  * label list, so no allocation is done.
1068  *
1069  * Returns 0
1070  */
1071 static int smack_file_alloc_security(struct file *file)
1072 {
1073         file->f_security = smk_of_current();
1074         return 0;
1075 }
1076 
1077 /**
1078  * smack_file_free_security - clear a file security blob
1079  * @file: the object
1080  *
1081  * The security blob for a file is a pointer to the master
1082  * label list, so no memory is freed.
1083  */
1084 static void smack_file_free_security(struct file *file)
1085 {
1086         file->f_security = NULL;
1087 }
1088 
1089 /**
1090  * smack_file_ioctl - Smack check on ioctls
1091  * @file: the object
1092  * @cmd: what to do
1093  * @arg: unused
1094  *
1095  * Relies heavily on the correct use of the ioctl command conventions.
1096  *
1097  * Returns 0 if allowed, error code otherwise
1098  */
1099 static int smack_file_ioctl(struct file *file, unsigned int cmd,
1100                             unsigned long arg)
1101 {
1102         int rc = 0;
1103         struct smk_audit_info ad;
1104 
1105         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1106         smk_ad_setfield_u_fs_path(&ad, file->f_path);
1107 
1108         if (_IOC_DIR(cmd) & _IOC_WRITE)
1109                 rc = smk_curacc(file->f_security, MAY_WRITE, &ad);
1110 
1111         if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ))
1112                 rc = smk_curacc(file->f_security, MAY_READ, &ad);
1113 
1114         return rc;
1115 }
1116 
1117 /**
1118  * smack_file_lock - Smack check on file locking
1119  * @file: the object
1120  * @cmd: unused
1121  *
1122  * Returns 0 if current has write access, error code otherwise
1123  */
1124 static int smack_file_lock(struct file *file, unsigned int cmd)
1125 {
1126         struct smk_audit_info ad;
1127 
1128         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1129         smk_ad_setfield_u_fs_path(&ad, file->f_path);
1130         return smk_curacc(file->f_security, MAY_WRITE, &ad);
1131 }
1132 
1133 /**
1134  * smack_file_fcntl - Smack check on fcntl
1135  * @file: the object
1136  * @cmd: what action to check
1137  * @arg: unused
1138  *
1139  * Generally these operations are harmless.
1140  * File locking operations present an obvious mechanism
1141  * for passing information, so they require write access.
1142  *
1143  * Returns 0 if current has access, error code otherwise
1144  */
1145 static int smack_file_fcntl(struct file *file, unsigned int cmd,
1146                             unsigned long arg)
1147 {
1148         struct smk_audit_info ad;
1149         int rc = 0;
1150 
1151 
1152         switch (cmd) {
1153         case F_GETLK:
1154         case F_SETLK:
1155         case F_SETLKW:
1156         case F_SETOWN:
1157         case F_SETSIG:
1158                 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1159                 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1160                 rc = smk_curacc(file->f_security, MAY_WRITE, &ad);
1161                 break;
1162         default:
1163                 break;
1164         }
1165 
1166         return rc;
1167 }
1168 
1169 /**
1170  * smack_mmap_file :
1171  * Check permissions for a mmap operation.  The @file may be NULL, e.g.
1172  * if mapping anonymous memory.
1173  * @file contains the file structure for file to map (may be NULL).
1174  * @reqprot contains the protection requested by the application.
1175  * @prot contains the protection that will be applied by the kernel.
1176  * @flags contains the operational flags.
1177  * Return 0 if permission is granted.
1178  */
1179 static int smack_mmap_file(struct file *file,
1180                            unsigned long reqprot, unsigned long prot,
1181                            unsigned long flags)
1182 {
1183         struct smack_known *skp;
1184         struct smack_rule *srp;
1185         struct task_smack *tsp;
1186         char *sp;
1187         char *msmack;
1188         char *osmack;
1189         struct inode_smack *isp;
1190         int may;
1191         int mmay;
1192         int tmay;
1193         int rc;
1194 
1195         if (file == NULL)
1196                 return 0;
1197 
1198         isp = file_inode(file)->i_security;
1199         if (isp->smk_mmap == NULL)
1200                 return 0;
1201         msmack = isp->smk_mmap;
1202 
1203         tsp = current_security();
1204         sp = smk_of_current();
1205         skp = smk_find_entry(sp);
1206         rc = 0;
1207 
1208         rcu_read_lock();
1209         /*
1210          * For each Smack rule associated with the subject
1211          * label verify that the SMACK64MMAP also has access
1212          * to that rule's object label.
1213          */
1214         list_for_each_entry_rcu(srp, &skp->smk_rules, list) {
1215                 osmack = srp->smk_object;
1216                 /*
1217                  * Matching labels always allows access.
1218                  */
1219                 if (msmack == osmack)
1220                         continue;
1221                 /*
1222                  * If there is a matching local rule take
1223                  * that into account as well.
1224                  */
1225                 may = smk_access_entry(srp->smk_subject, osmack,
1226                                         &tsp->smk_rules);
1227                 if (may == -ENOENT)
1228                         may = srp->smk_access;
1229                 else
1230                         may &= srp->smk_access;
1231                 /*
1232                  * If may is zero the SMACK64MMAP subject can't
1233                  * possibly have less access.
1234                  */
1235                 if (may == 0)
1236                         continue;
1237 
1238                 /*
1239                  * Fetch the global list entry.
1240                  * If there isn't one a SMACK64MMAP subject
1241                  * can't have as much access as current.
1242                  */
1243                 skp = smk_find_entry(msmack);
1244                 mmay = smk_access_entry(msmack, osmack, &skp->smk_rules);
1245                 if (mmay == -ENOENT) {
1246                         rc = -EACCES;
1247                         break;
1248                 }
1249                 /*
1250                  * If there is a local entry it modifies the
1251                  * potential access, too.
1252                  */
1253                 tmay = smk_access_entry(msmack, osmack, &tsp->smk_rules);
1254                 if (tmay != -ENOENT)
1255                         mmay &= tmay;
1256 
1257                 /*
1258                  * If there is any access available to current that is
1259                  * not available to a SMACK64MMAP subject
1260                  * deny access.
1261                  */
1262                 if ((may | mmay) != mmay) {
1263                         rc = -EACCES;
1264                         break;
1265                 }
1266         }
1267 
1268         rcu_read_unlock();
1269 
1270         return rc;
1271 }
1272 
1273 /**
1274  * smack_file_set_fowner - set the file security blob value
1275  * @file: object in question
1276  *
1277  * Returns 0
1278  * Further research may be required on this one.
1279  */
1280 static int smack_file_set_fowner(struct file *file)
1281 {
1282         file->f_security = smk_of_current();
1283         return 0;
1284 }
1285 
1286 /**
1287  * smack_file_send_sigiotask - Smack on sigio
1288  * @tsk: The target task
1289  * @fown: the object the signal come from
1290  * @signum: unused
1291  *
1292  * Allow a privileged task to get signals even if it shouldn't
1293  *
1294  * Returns 0 if a subject with the object's smack could
1295  * write to the task, an error code otherwise.
1296  */
1297 static int smack_file_send_sigiotask(struct task_struct *tsk,
1298                                      struct fown_struct *fown, int signum)
1299 {
1300         struct file *file;
1301         int rc;
1302         char *tsp = smk_of_task(tsk->cred->security);
1303         struct smk_audit_info ad;
1304 
1305         /*
1306          * struct fown_struct is never outside the context of a struct file
1307          */
1308         file = container_of(fown, struct file, f_owner);
1309 
1310         /* we don't log here as rc can be overriden */
1311         rc = smk_access(file->f_security, tsp, MAY_WRITE, NULL);
1312         if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE))
1313                 rc = 0;
1314 
1315         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1316         smk_ad_setfield_u_tsk(&ad, tsk);
1317         smack_log(file->f_security, tsp, MAY_WRITE, rc, &ad);
1318         return rc;
1319 }
1320 
1321 /**
1322  * smack_file_receive - Smack file receive check
1323  * @file: the object
1324  *
1325  * Returns 0 if current has access, error code otherwise
1326  */
1327 static int smack_file_receive(struct file *file)
1328 {
1329         int may = 0;
1330         struct smk_audit_info ad;
1331 
1332         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1333         smk_ad_setfield_u_fs_path(&ad, file->f_path);
1334         /*
1335          * This code relies on bitmasks.
1336          */
1337         if (file->f_mode & FMODE_READ)
1338                 may = MAY_READ;
1339         if (file->f_mode & FMODE_WRITE)
1340                 may |= MAY_WRITE;
1341 
1342         return smk_curacc(file->f_security, may, &ad);
1343 }
1344 
1345 /**
1346  * smack_file_open - Smack dentry open processing
1347  * @file: the object
1348  * @cred: unused
1349  *
1350  * Set the security blob in the file structure.
1351  *
1352  * Returns 0
1353  */
1354 static int smack_file_open(struct file *file, const struct cred *cred)
1355 {
1356         struct inode_smack *isp = file_inode(file)->i_security;
1357 
1358         file->f_security = isp->smk_inode;
1359 
1360         return 0;
1361 }
1362 
1363 /*
1364  * Task hooks
1365  */
1366 
1367 /**
1368  * smack_cred_alloc_blank - "allocate" blank task-level security credentials
1369  * @new: the new credentials
1370  * @gfp: the atomicity of any memory allocations
1371  *
1372  * Prepare a blank set of credentials for modification.  This must allocate all
1373  * the memory the LSM module might require such that cred_transfer() can
1374  * complete without error.
1375  */
1376 static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp)
1377 {
1378         struct task_smack *tsp;
1379 
1380         tsp = new_task_smack(NULL, NULL, gfp);
1381         if (tsp == NULL)
1382                 return -ENOMEM;
1383 
1384         cred->security = tsp;
1385 
1386         return 0;
1387 }
1388 
1389 
1390 /**
1391  * smack_cred_free - "free" task-level security credentials
1392  * @cred: the credentials in question
1393  *
1394  */
1395 static void smack_cred_free(struct cred *cred)
1396 {
1397         struct task_smack *tsp = cred->security;
1398         struct smack_rule *rp;
1399         struct list_head *l;
1400         struct list_head *n;
1401 
1402         if (tsp == NULL)
1403                 return;
1404         cred->security = NULL;
1405 
1406         list_for_each_safe(l, n, &tsp->smk_rules) {
1407                 rp = list_entry(l, struct smack_rule, list);
1408                 list_del(&rp->list);
1409                 kfree(rp);
1410         }
1411         kfree(tsp);
1412 }
1413 
1414 /**
1415  * smack_cred_prepare - prepare new set of credentials for modification
1416  * @new: the new credentials
1417  * @old: the original credentials
1418  * @gfp: the atomicity of any memory allocations
1419  *
1420  * Prepare a new set of credentials for modification.
1421  */
1422 static int smack_cred_prepare(struct cred *new, const struct cred *old,
1423                               gfp_t gfp)
1424 {
1425         struct task_smack *old_tsp = old->security;
1426         struct task_smack *new_tsp;
1427         int rc;
1428 
1429         new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp);
1430         if (new_tsp == NULL)
1431                 return -ENOMEM;
1432 
1433         rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp);
1434         if (rc != 0)
1435                 return rc;
1436 
1437         new->security = new_tsp;
1438         return 0;
1439 }
1440 
1441 /**
1442  * smack_cred_transfer - Transfer the old credentials to the new credentials
1443  * @new: the new credentials
1444  * @old: the original credentials
1445  *
1446  * Fill in a set of blank credentials from another set of credentials.
1447  */
1448 static void smack_cred_transfer(struct cred *new, const struct cred *old)
1449 {
1450         struct task_smack *old_tsp = old->security;
1451         struct task_smack *new_tsp = new->security;
1452 
1453         new_tsp->smk_task = old_tsp->smk_task;
1454         new_tsp->smk_forked = old_tsp->smk_task;
1455         mutex_init(&new_tsp->smk_rules_lock);
1456         INIT_LIST_HEAD(&new_tsp->smk_rules);
1457 
1458 
1459         /* cbs copy rule list */
1460 }
1461 
1462 /**
1463  * smack_kernel_act_as - Set the subjective context in a set of credentials
1464  * @new: points to the set of credentials to be modified.
1465  * @secid: specifies the security ID to be set
1466  *
1467  * Set the security data for a kernel service.
1468  */
1469 static int smack_kernel_act_as(struct cred *new, u32 secid)
1470 {
1471         struct task_smack *new_tsp = new->security;
1472         char *smack = smack_from_secid(secid);
1473 
1474         if (smack == NULL)
1475                 return -EINVAL;
1476 
1477         new_tsp->smk_task = smack;
1478         return 0;
1479 }
1480 
1481 /**
1482  * smack_kernel_create_files_as - Set the file creation label in a set of creds
1483  * @new: points to the set of credentials to be modified
1484  * @inode: points to the inode to use as a reference
1485  *
1486  * Set the file creation context in a set of credentials to the same
1487  * as the objective context of the specified inode
1488  */
1489 static int smack_kernel_create_files_as(struct cred *new,
1490                                         struct inode *inode)
1491 {
1492         struct inode_smack *isp = inode->i_security;
1493         struct task_smack *tsp = new->security;
1494 
1495         tsp->smk_forked = isp->smk_inode;
1496         tsp->smk_task = isp->smk_inode;
1497         return 0;
1498 }
1499 
1500 /**
1501  * smk_curacc_on_task - helper to log task related access
1502  * @p: the task object
1503  * @access: the access requested
1504  * @caller: name of the calling function for audit
1505  *
1506  * Return 0 if access is permitted
1507  */
1508 static int smk_curacc_on_task(struct task_struct *p, int access,
1509                                 const char *caller)
1510 {
1511         struct smk_audit_info ad;
1512 
1513         smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK);
1514         smk_ad_setfield_u_tsk(&ad, p);
1515         return smk_curacc(smk_of_task(task_security(p)), access, &ad);
1516 }
1517 
1518 /**
1519  * smack_task_setpgid - Smack check on setting pgid
1520  * @p: the task object
1521  * @pgid: unused
1522  *
1523  * Return 0 if write access is permitted
1524  */
1525 static int smack_task_setpgid(struct task_struct *p, pid_t pgid)
1526 {
1527         return smk_curacc_on_task(p, MAY_WRITE, __func__);
1528 }
1529 
1530 /**
1531  * smack_task_getpgid - Smack access check for getpgid
1532  * @p: the object task
1533  *
1534  * Returns 0 if current can read the object task, error code otherwise
1535  */
1536 static int smack_task_getpgid(struct task_struct *p)
1537 {
1538         return smk_curacc_on_task(p, MAY_READ, __func__);
1539 }
1540 
1541 /**
1542  * smack_task_getsid - Smack access check for getsid
1543  * @p: the object task
1544  *
1545  * Returns 0 if current can read the object task, error code otherwise
1546  */
1547 static int smack_task_getsid(struct task_struct *p)
1548 {
1549         return smk_curacc_on_task(p, MAY_READ, __func__);
1550 }
1551 
1552 /**
1553  * smack_task_getsecid - get the secid of the task
1554  * @p: the object task
1555  * @secid: where to put the result
1556  *
1557  * Sets the secid to contain a u32 version of the smack label.
1558  */
1559 static void smack_task_getsecid(struct task_struct *p, u32 *secid)
1560 {
1561         *secid = smack_to_secid(smk_of_task(task_security(p)));
1562 }
1563 
1564 /**
1565  * smack_task_setnice - Smack check on setting nice
1566  * @p: the task object
1567  * @nice: unused
1568  *
1569  * Return 0 if write access is permitted
1570  */
1571 static int smack_task_setnice(struct task_struct *p, int nice)
1572 {
1573         int rc;
1574 
1575         rc = cap_task_setnice(p, nice);
1576         if (rc == 0)
1577                 rc = smk_curacc_on_task(p, MAY_WRITE, __func__);
1578         return rc;
1579 }
1580 
1581 /**
1582  * smack_task_setioprio - Smack check on setting ioprio
1583  * @p: the task object
1584  * @ioprio: unused
1585  *
1586  * Return 0 if write access is permitted
1587  */
1588 static int smack_task_setioprio(struct task_struct *p, int ioprio)
1589 {
1590         int rc;
1591 
1592         rc = cap_task_setioprio(p, ioprio);
1593         if (rc == 0)
1594                 rc = smk_curacc_on_task(p, MAY_WRITE, __func__);
1595         return rc;
1596 }
1597 
1598 /**
1599  * smack_task_getioprio - Smack check on reading ioprio
1600  * @p: the task object
1601  *
1602  * Return 0 if read access is permitted
1603  */
1604 static int smack_task_getioprio(struct task_struct *p)
1605 {
1606         return smk_curacc_on_task(p, MAY_READ, __func__);
1607 }
1608 
1609 /**
1610  * smack_task_setscheduler - Smack check on setting scheduler
1611  * @p: the task object
1612  * @policy: unused
1613  * @lp: unused
1614  *
1615  * Return 0 if read access is permitted
1616  */
1617 static int smack_task_setscheduler(struct task_struct *p)
1618 {
1619         int rc;
1620 
1621         rc = cap_task_setscheduler(p);
1622         if (rc == 0)
1623                 rc = smk_curacc_on_task(p, MAY_WRITE, __func__);
1624         return rc;
1625 }
1626 
1627 /**
1628  * smack_task_getscheduler - Smack check on reading scheduler
1629  * @p: the task object
1630  *
1631  * Return 0 if read access is permitted
1632  */
1633 static int smack_task_getscheduler(struct task_struct *p)
1634 {
1635         return smk_curacc_on_task(p, MAY_READ, __func__);
1636 }
1637 
1638 /**
1639  * smack_task_movememory - Smack check on moving memory
1640  * @p: the task object
1641  *
1642  * Return 0 if write access is permitted
1643  */
1644 static int smack_task_movememory(struct task_struct *p)
1645 {
1646         return smk_curacc_on_task(p, MAY_WRITE, __func__);
1647 }
1648 
1649 /**
1650  * smack_task_kill - Smack check on signal delivery
1651  * @p: the task object
1652  * @info: unused
1653  * @sig: unused
1654  * @secid: identifies the smack to use in lieu of current's
1655  *
1656  * Return 0 if write access is permitted
1657  *
1658  * The secid behavior is an artifact of an SELinux hack
1659  * in the USB code. Someday it may go away.
1660  */
1661 static int smack_task_kill(struct task_struct *p, struct siginfo *info,
1662                            int sig, u32 secid)
1663 {
1664         struct smk_audit_info ad;
1665 
1666         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1667         smk_ad_setfield_u_tsk(&ad, p);
1668         /*
1669          * Sending a signal requires that the sender
1670          * can write the receiver.
1671          */
1672         if (secid == 0)
1673                 return smk_curacc(smk_of_task(task_security(p)), MAY_WRITE,
1674                                   &ad);
1675         /*
1676          * If the secid isn't 0 we're dealing with some USB IO
1677          * specific behavior. This is not clean. For one thing
1678          * we can't take privilege into account.
1679          */
1680         return smk_access(smack_from_secid(secid),
1681                           smk_of_task(task_security(p)), MAY_WRITE, &ad);
1682 }
1683 
1684 /**
1685  * smack_task_wait - Smack access check for waiting
1686  * @p: task to wait for
1687  *
1688  * Returns 0
1689  */
1690 static int smack_task_wait(struct task_struct *p)
1691 {
1692         /*
1693          * Allow the operation to succeed.
1694          * Zombies are bad.
1695          * In userless environments (e.g. phones) programs
1696          * get marked with SMACK64EXEC and even if the parent
1697          * and child shouldn't be talking the parent still
1698          * may expect to know when the child exits.
1699          */
1700         return 0;
1701 }
1702 
1703 /**
1704  * smack_task_to_inode - copy task smack into the inode blob
1705  * @p: task to copy from
1706  * @inode: inode to copy to
1707  *
1708  * Sets the smack pointer in the inode security blob
1709  */
1710 static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
1711 {
1712         struct inode_smack *isp = inode->i_security;
1713         isp->smk_inode = smk_of_task(task_security(p));
1714 }
1715 
1716 /*
1717  * Socket hooks.
1718  */
1719 
1720 /**
1721  * smack_sk_alloc_security - Allocate a socket blob
1722  * @sk: the socket
1723  * @family: unused
1724  * @gfp_flags: memory allocation flags
1725  *
1726  * Assign Smack pointers to current
1727  *
1728  * Returns 0 on success, -ENOMEM is there's no memory
1729  */
1730 static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
1731 {
1732         char *csp = smk_of_current();
1733         struct socket_smack *ssp;
1734 
1735         ssp = kzalloc(sizeof(struct socket_smack), gfp_flags);
1736         if (ssp == NULL)
1737                 return -ENOMEM;
1738 
1739         ssp->smk_in = csp;
1740         ssp->smk_out = csp;
1741         ssp->smk_packet = NULL;
1742 
1743         sk->sk_security = ssp;
1744 
1745         return 0;
1746 }
1747 
1748 /**
1749  * smack_sk_free_security - Free a socket blob
1750  * @sk: the socket
1751  *
1752  * Clears the blob pointer
1753  */
1754 static void smack_sk_free_security(struct sock *sk)
1755 {
1756         kfree(sk->sk_security);
1757 }
1758 
1759 /**
1760 * smack_host_label - check host based restrictions
1761 * @sip: the object end
1762 *
1763 * looks for host based access restrictions
1764 *
1765 * This version will only be appropriate for really small sets of single label
1766 * hosts.  The caller is responsible for ensuring that the RCU read lock is
1767 * taken before calling this function.
1768 *
1769 * Returns the label of the far end or NULL if it's not special.
1770 */
1771 static char *smack_host_label(struct sockaddr_in *sip)
1772 {
1773         struct smk_netlbladdr *snp;
1774         struct in_addr *siap = &sip->sin_addr;
1775 
1776         if (siap->s_addr == 0)
1777                 return NULL;
1778 
1779         list_for_each_entry_rcu(snp, &smk_netlbladdr_list, list)
1780                 /*
1781                 * we break after finding the first match because
1782                 * the list is sorted from longest to shortest mask
1783                 * so we have found the most specific match
1784                 */
1785                 if ((&snp->smk_host.sin_addr)->s_addr ==
1786                     (siap->s_addr & (&snp->smk_mask)->s_addr)) {
1787                         /* we have found the special CIPSO option */
1788                         if (snp->smk_label == smack_cipso_option)
1789                                 return NULL;
1790                         return snp->smk_label;
1791                 }
1792 
1793         return NULL;
1794 }
1795 
1796 /**
1797  * smack_netlabel - Set the secattr on a socket
1798  * @sk: the socket
1799  * @labeled: socket label scheme
1800  *
1801  * Convert the outbound smack value (smk_out) to a
1802  * secattr and attach it to the socket.
1803  *
1804  * Returns 0 on success or an error code
1805  */
1806 static int smack_netlabel(struct sock *sk, int labeled)
1807 {
1808         struct smack_known *skp;
1809         struct socket_smack *ssp = sk->sk_security;
1810         int rc = 0;
1811 
1812         /*
1813          * Usually the netlabel code will handle changing the
1814          * packet labeling based on the label.
1815          * The case of a single label host is different, because
1816          * a single label host should never get a labeled packet
1817          * even though the label is usually associated with a packet
1818          * label.
1819          */
1820         local_bh_disable();
1821         bh_lock_sock_nested(sk);
1822 
1823         if (ssp->smk_out == smack_net_ambient ||
1824             labeled == SMACK_UNLABELED_SOCKET)
1825                 netlbl_sock_delattr(sk);
1826         else {
1827                 skp = smk_find_entry(ssp->smk_out);
1828                 rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel);
1829         }
1830 
1831         bh_unlock_sock(sk);
1832         local_bh_enable();
1833 
1834         return rc;
1835 }
1836 
1837 /**
1838  * smack_netlbel_send - Set the secattr on a socket and perform access checks
1839  * @sk: the socket
1840  * @sap: the destination address
1841  *
1842  * Set the correct secattr for the given socket based on the destination
1843  * address and perform any outbound access checks needed.
1844  *
1845  * Returns 0 on success or an error code.
1846  *
1847  */
1848 static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap)
1849 {
1850         int rc;
1851         int sk_lbl;
1852         char *hostsp;
1853         struct socket_smack *ssp = sk->sk_security;
1854         struct smk_audit_info ad;
1855 
1856         rcu_read_lock();
1857         hostsp = smack_host_label(sap);
1858         if (hostsp != NULL) {
1859 #ifdef CONFIG_AUDIT
1860                 struct lsm_network_audit net;
1861 
1862                 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
1863                 ad.a.u.net->family = sap->sin_family;
1864                 ad.a.u.net->dport = sap->sin_port;
1865                 ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr;
1866 #endif
1867                 sk_lbl = SMACK_UNLABELED_SOCKET;
1868                 rc = smk_access(ssp->smk_out, hostsp, MAY_WRITE, &ad);
1869         } else {
1870                 sk_lbl = SMACK_CIPSO_SOCKET;
1871                 rc = 0;
1872         }
1873         rcu_read_unlock();
1874         if (rc != 0)
1875                 return rc;
1876 
1877         return smack_netlabel(sk, sk_lbl);
1878 }
1879 
1880 /**
1881  * smack_inode_setsecurity - set smack xattrs
1882  * @inode: the object
1883  * @name: attribute name
1884  * @value: attribute value
1885  * @size: size of the attribute
1886  * @flags: unused
1887  *
1888  * Sets the named attribute in the appropriate blob
1889  *
1890  * Returns 0 on success, or an error code
1891  */
1892 static int smack_inode_setsecurity(struct inode *inode, const char *name,
1893                                    const void *value, size_t size, int flags)
1894 {
1895         char *sp;
1896         struct inode_smack *nsp = inode->i_security;
1897         struct socket_smack *ssp;
1898         struct socket *sock;
1899         int rc = 0;
1900 
1901         if (value == NULL || size > SMK_LONGLABEL || size == 0)
1902                 return -EACCES;
1903 
1904         sp = smk_import(value, size);
1905         if (sp == NULL)
1906                 return -EINVAL;
1907 
1908         if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
1909                 nsp->smk_inode = sp;
1910                 nsp->smk_flags |= SMK_INODE_INSTANT;
1911                 return 0;
1912         }
1913         /*
1914          * The rest of the Smack xattrs are only on sockets.
1915          */
1916         if (inode->i_sb->s_magic != SOCKFS_MAGIC)
1917                 return -EOPNOTSUPP;
1918 
1919         sock = SOCKET_I(inode);
1920         if (sock == NULL || sock->sk == NULL)
1921                 return -EOPNOTSUPP;
1922 
1923         ssp = sock->sk->sk_security;
1924 
1925         if (strcmp(name, XATTR_SMACK_IPIN) == 0)
1926                 ssp->smk_in = sp;
1927         else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) {
1928                 ssp->smk_out = sp;
1929                 if (sock->sk->sk_family != PF_UNIX) {
1930                         rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
1931                         if (rc != 0)
1932                                 printk(KERN_WARNING
1933                                         "Smack: \"%s\" netlbl error %d.\n",
1934                                         __func__, -rc);
1935                 }
1936         } else
1937                 return -EOPNOTSUPP;
1938 
1939         return 0;
1940 }
1941 
1942 /**
1943  * smack_socket_post_create - finish socket setup
1944  * @sock: the socket
1945  * @family: protocol family
1946  * @type: unused
1947  * @protocol: unused
1948  * @kern: unused
1949  *
1950  * Sets the netlabel information on the socket
1951  *
1952  * Returns 0 on success, and error code otherwise
1953  */
1954 static int smack_socket_post_create(struct socket *sock, int family,
1955                                     int type, int protocol, int kern)
1956 {
1957         if (family != PF_INET || sock->sk == NULL)
1958                 return 0;
1959         /*
1960          * Set the outbound netlbl.
1961          */
1962         return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
1963 }
1964 
1965 /**
1966  * smack_socket_connect - connect access check
1967  * @sock: the socket
1968  * @sap: the other end
1969  * @addrlen: size of sap
1970  *
1971  * Verifies that a connection may be possible
1972  *
1973  * Returns 0 on success, and error code otherwise
1974  */
1975 static int smack_socket_connect(struct socket *sock, struct sockaddr *sap,
1976                                 int addrlen)
1977 {
1978         if (sock->sk == NULL || sock->sk->sk_family != PF_INET)
1979                 return 0;
1980         if (addrlen < sizeof(struct sockaddr_in))
1981                 return -EINVAL;
1982 
1983         return smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap);
1984 }
1985 
1986 /**
1987  * smack_flags_to_may - convert S_ to MAY_ values
1988  * @flags: the S_ value
1989  *
1990  * Returns the equivalent MAY_ value
1991  */
1992 static int smack_flags_to_may(int flags)
1993 {
1994         int may = 0;
1995 
1996         if (flags & S_IRUGO)
1997                 may |= MAY_READ;
1998         if (flags & S_IWUGO)
1999                 may |= MAY_WRITE;
2000         if (flags & S_IXUGO)
2001                 may |= MAY_EXEC;
2002 
2003         return may;
2004 }
2005 
2006 /**
2007  * smack_msg_msg_alloc_security - Set the security blob for msg_msg
2008  * @msg: the object
2009  *
2010  * Returns 0
2011  */
2012 static int smack_msg_msg_alloc_security(struct msg_msg *msg)
2013 {
2014         msg->security = smk_of_current();
2015         return 0;
2016 }
2017 
2018 /**
2019  * smack_msg_msg_free_security - Clear the security blob for msg_msg
2020  * @msg: the object
2021  *
2022  * Clears the blob pointer
2023  */
2024 static void smack_msg_msg_free_security(struct msg_msg *msg)
2025 {
2026         msg->security = NULL;
2027 }
2028 
2029 /**
2030  * smack_of_shm - the smack pointer for the shm
2031  * @shp: the object
2032  *
2033  * Returns a pointer to the smack value
2034  */
2035 static char *smack_of_shm(struct shmid_kernel *shp)
2036 {
2037         return (char *)shp->shm_perm.security;
2038 }
2039 
2040 /**
2041  * smack_shm_alloc_security - Set the security blob for shm
2042  * @shp: the object
2043  *
2044  * Returns 0
2045  */
2046 static int smack_shm_alloc_security(struct shmid_kernel *shp)
2047 {
2048         struct kern_ipc_perm *isp = &shp->shm_perm;
2049 
2050         isp->security = smk_of_current();
2051         return 0;
2052 }
2053 
2054 /**
2055  * smack_shm_free_security - Clear the security blob for shm
2056  * @shp: the object
2057  *
2058  * Clears the blob pointer
2059  */
2060 static void smack_shm_free_security(struct shmid_kernel *shp)
2061 {
2062         struct kern_ipc_perm *isp = &shp->shm_perm;
2063 
2064         isp->security = NULL;
2065 }
2066 
2067 /**
2068  * smk_curacc_shm : check if current has access on shm
2069  * @shp : the object
2070  * @access : access requested
2071  *
2072  * Returns 0 if current has the requested access, error code otherwise
2073  */
2074 static int smk_curacc_shm(struct shmid_kernel *shp, int access)
2075 {
2076         char *ssp = smack_of_shm(shp);
2077         struct smk_audit_info ad;
2078 
2079 #ifdef CONFIG_AUDIT
2080         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2081         ad.a.u.ipc_id = shp->shm_perm.id;
2082 #endif
2083         return smk_curacc(ssp, access, &ad);
2084 }
2085 
2086 /**
2087  * smack_shm_associate - Smack access check for shm
2088  * @shp: the object
2089  * @shmflg: access requested
2090  *
2091  * Returns 0 if current has the requested access, error code otherwise
2092  */
2093 static int smack_shm_associate(struct shmid_kernel *shp, int shmflg)
2094 {
2095         int may;
2096 
2097         may = smack_flags_to_may(shmflg);
2098         return smk_curacc_shm(shp, may);
2099 }
2100 
2101 /**
2102  * smack_shm_shmctl - Smack access check for shm
2103  * @shp: the object
2104  * @cmd: what it wants to do
2105  *
2106  * Returns 0 if current has the requested access, error code otherwise
2107  */
2108 static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd)
2109 {
2110         int may;
2111 
2112         switch (cmd) {
2113         case IPC_STAT:
2114         case SHM_STAT:
2115                 may = MAY_READ;
2116                 break;
2117         case IPC_SET:
2118         case SHM_LOCK:
2119         case SHM_UNLOCK:
2120         case IPC_RMID:
2121                 may = MAY_READWRITE;
2122                 break;
2123         case IPC_INFO:
2124         case SHM_INFO:
2125                 /*
2126                  * System level information.
2127                  */
2128                 return 0;
2129         default:
2130                 return -EINVAL;
2131         }
2132         return smk_curacc_shm(shp, may);
2133 }
2134 
2135 /**
2136  * smack_shm_shmat - Smack access for shmat
2137  * @shp: the object
2138  * @shmaddr: unused
2139  * @shmflg: access requested
2140  *
2141  * Returns 0 if current has the requested access, error code otherwise
2142  */
2143 static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr,
2144                            int shmflg)
2145 {
2146         int may;
2147 
2148         may = smack_flags_to_may(shmflg);
2149         return smk_curacc_shm(shp, may);
2150 }
2151 
2152 /**
2153  * smack_of_sem - the smack pointer for the sem
2154  * @sma: the object
2155  *
2156  * Returns a pointer to the smack value
2157  */
2158 static char *smack_of_sem(struct sem_array *sma)
2159 {
2160         return (char *)sma->sem_perm.security;
2161 }
2162 
2163 /**
2164  * smack_sem_alloc_security - Set the security blob for sem
2165  * @sma: the object
2166  *
2167  * Returns 0
2168  */
2169 static int smack_sem_alloc_security(struct sem_array *sma)
2170 {
2171         struct kern_ipc_perm *isp = &sma->sem_perm;
2172 
2173         isp->security = smk_of_current();
2174         return 0;
2175 }
2176 
2177 /**
2178  * smack_sem_free_security - Clear the security blob for sem
2179  * @sma: the object
2180  *
2181  * Clears the blob pointer
2182  */
2183 static void smack_sem_free_security(struct sem_array *sma)
2184 {
2185         struct kern_ipc_perm *isp = &sma->sem_perm;
2186 
2187         isp->security = NULL;
2188 }
2189 
2190 /**
2191  * smk_curacc_sem : check if current has access on sem
2192  * @sma : the object
2193  * @access : access requested
2194  *
2195  * Returns 0 if current has the requested access, error code otherwise
2196  */
2197 static int smk_curacc_sem(struct sem_array *sma, int access)
2198 {
2199         char *ssp = smack_of_sem(sma);
2200         struct smk_audit_info ad;
2201 
2202 #ifdef CONFIG_AUDIT
2203         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2204         ad.a.u.ipc_id = sma->sem_perm.id;
2205 #endif
2206         return smk_curacc(ssp, access, &ad);
2207 }
2208 
2209 /**
2210  * smack_sem_associate - Smack access check for sem
2211  * @sma: the object
2212  * @semflg: access requested
2213  *
2214  * Returns 0 if current has the requested access, error code otherwise
2215  */
2216 static int smack_sem_associate(struct sem_array *sma, int semflg)
2217 {
2218         int may;
2219 
2220         may = smack_flags_to_may(semflg);
2221         return smk_curacc_sem(sma, may);
2222 }
2223 
2224 /**
2225  * smack_sem_shmctl - Smack access check for sem
2226  * @sma: the object
2227  * @cmd: what it wants to do
2228  *
2229  * Returns 0 if current has the requested access, error code otherwise
2230  */
2231 static int smack_sem_semctl(struct sem_array *sma, int cmd)
2232 {
2233         int may;
2234 
2235         switch (cmd) {
2236         case GETPID:
2237         case GETNCNT:
2238         case GETZCNT:
2239         case GETVAL:
2240         case GETALL:
2241         case IPC_STAT:
2242         case SEM_STAT:
2243                 may = MAY_READ;
2244                 break;
2245         case SETVAL:
2246         case SETALL:
2247         case IPC_RMID:
2248         case IPC_SET:
2249                 may = MAY_READWRITE;
2250                 break;
2251         case IPC_INFO:
2252         case SEM_INFO:
2253                 /*
2254                  * System level information
2255                  */
2256                 return 0;
2257         default:
2258                 return -EINVAL;
2259         }
2260 
2261         return smk_curacc_sem(sma, may);
2262 }
2263 
2264 /**
2265  * smack_sem_semop - Smack checks of semaphore operations
2266  * @sma: the object
2267  * @sops: unused
2268  * @nsops: unused
2269  * @alter: unused
2270  *
2271  * Treated as read and write in all cases.
2272  *
2273  * Returns 0 if access is allowed, error code otherwise
2274  */
2275 static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops,
2276                            unsigned nsops, int alter)
2277 {
2278         return smk_curacc_sem(sma, MAY_READWRITE);
2279 }
2280 
2281 /**
2282  * smack_msg_alloc_security - Set the security blob for msg
2283  * @msq: the object
2284  *
2285  * Returns 0
2286  */
2287 static int smack_msg_queue_alloc_security(struct msg_queue *msq)
2288 {
2289         struct kern_ipc_perm *kisp = &msq->q_perm;
2290 
2291         kisp->security = smk_of_current();
2292         return 0;
2293 }
2294 
2295 /**
2296  * smack_msg_free_security - Clear the security blob for msg
2297  * @msq: the object
2298  *
2299  * Clears the blob pointer
2300  */
2301 static void smack_msg_queue_free_security(struct msg_queue *msq)
2302 {
2303         struct kern_ipc_perm *kisp = &msq->q_perm;
2304 
2305         kisp->security = NULL;
2306 }
2307 
2308 /**
2309  * smack_of_msq - the smack pointer for the msq
2310  * @msq: the object
2311  *
2312  * Returns a pointer to the smack value
2313  */
2314 static char *smack_of_msq(struct msg_queue *msq)
2315 {
2316         return (char *)msq->q_perm.security;
2317 }
2318 
2319 /**
2320  * smk_curacc_msq : helper to check if current has access on msq
2321  * @msq : the msq
2322  * @access : access requested
2323  *
2324  * return 0 if current has access, error otherwise
2325  */
2326 static int smk_curacc_msq(struct msg_queue *msq, int access)
2327 {
2328         char *msp = smack_of_msq(msq);
2329         struct smk_audit_info ad;
2330 
2331 #ifdef CONFIG_AUDIT
2332         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2333         ad.a.u.ipc_id = msq->q_perm.id;
2334 #endif
2335         return smk_curacc(msp, access, &ad);
2336 }
2337 
2338 /**
2339  * smack_msg_queue_associate - Smack access check for msg_queue
2340  * @msq: the object
2341  * @msqflg: access requested
2342  *
2343  * Returns 0 if current has the requested access, error code otherwise
2344  */
2345 static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg)
2346 {
2347         int may;
2348 
2349         may = smack_flags_to_may(msqflg);
2350         return smk_curacc_msq(msq, may);
2351 }
2352 
2353 /**
2354  * smack_msg_queue_msgctl - Smack access check for msg_queue
2355  * @msq: the object
2356  * @cmd: what it wants to do
2357  *
2358  * Returns 0 if current has the requested access, error code otherwise
2359  */
2360 static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd)
2361 {
2362         int may;
2363 
2364         switch (cmd) {
2365         case IPC_STAT:
2366         case MSG_STAT:
2367                 may = MAY_READ;
2368                 break;
2369         case IPC_SET:
2370         case IPC_RMID:
2371                 may = MAY_READWRITE;
2372                 break;
2373         case IPC_INFO:
2374         case MSG_INFO:
2375                 /*
2376                  * System level information
2377                  */
2378                 return 0;
2379         default:
2380                 return -EINVAL;
2381         }
2382 
2383         return smk_curacc_msq(msq, may);
2384 }
2385 
2386 /**
2387  * smack_msg_queue_msgsnd - Smack access check for msg_queue
2388  * @msq: the object
2389  * @msg: unused
2390  * @msqflg: access requested
2391  *
2392  * Returns 0 if current has the requested access, error code otherwise
2393  */
2394 static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg,
2395                                   int msqflg)
2396 {
2397         int may;
2398 
2399         may = smack_flags_to_may(msqflg);
2400         return smk_curacc_msq(msq, may);
2401 }
2402 
2403 /**
2404  * smack_msg_queue_msgsnd - Smack access check for msg_queue
2405  * @msq: the object
2406  * @msg: unused
2407  * @target: unused
2408  * @type: unused
2409  * @mode: unused
2410  *
2411  * Returns 0 if current has read and write access, error code otherwise
2412  */
2413 static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
2414                         struct task_struct *target, long type, int mode)
2415 {
2416         return smk_curacc_msq(msq, MAY_READWRITE);
2417 }
2418 
2419 /**
2420  * smack_ipc_permission - Smack access for ipc_permission()
2421  * @ipp: the object permissions
2422  * @flag: access requested
2423  *
2424  * Returns 0 if current has read and write access, error code otherwise
2425  */
2426 static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag)
2427 {
2428         char *isp = ipp->security;
2429         int may = smack_flags_to_may(flag);
2430         struct smk_audit_info ad;
2431 
2432 #ifdef CONFIG_AUDIT
2433         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2434         ad.a.u.ipc_id = ipp->id;
2435 #endif
2436         return smk_curacc(isp, may, &ad);
2437 }
2438 
2439 /**
2440  * smack_ipc_getsecid - Extract smack security id
2441  * @ipp: the object permissions
2442  * @secid: where result will be saved
2443  */
2444 static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid)
2445 {
2446         char *smack = ipp->security;
2447 
2448         *secid = smack_to_secid(smack);
2449 }
2450 
2451 /**
2452  * smack_d_instantiate - Make sure the blob is correct on an inode
2453  * @opt_dentry: dentry where inode will be attached
2454  * @inode: the object
2455  *
2456  * Set the inode's security blob if it hasn't been done already.
2457  */
2458 static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
2459 {
2460         struct super_block *sbp;
2461         struct superblock_smack *sbsp;
2462         struct inode_smack *isp;
2463         char *csp = smk_of_current();
2464         char *fetched;
2465         char *final;
2466         char trattr[TRANS_TRUE_SIZE];
2467         int transflag = 0;
2468         int rc;
2469         struct dentry *dp;
2470 
2471         if (inode == NULL)
2472                 return;
2473 
2474         isp = inode->i_security;
2475 
2476         mutex_lock(&isp->smk_lock);
2477         /*
2478          * If the inode is already instantiated
2479          * take the quick way out
2480          */
2481         if (isp->smk_flags & SMK_INODE_INSTANT)
2482                 goto unlockandout;
2483 
2484         sbp = inode->i_sb;
2485         sbsp = sbp->s_security;
2486         /*
2487          * We're going to use the superblock default label
2488          * if there's no label on the file.
2489          */
2490         final = sbsp->smk_default;
2491 
2492         /*
2493          * If this is the root inode the superblock
2494          * may be in the process of initialization.
2495          * If that is the case use the root value out
2496          * of the superblock.
2497          */
2498         if (opt_dentry->d_parent == opt_dentry) {
2499                 isp->smk_inode = sbsp->smk_root;
2500                 isp->smk_flags |= SMK_INODE_INSTANT;
2501                 goto unlockandout;
2502         }
2503 
2504         /*
2505          * This is pretty hackish.
2506          * Casey says that we shouldn't have to do
2507          * file system specific code, but it does help
2508          * with keeping it simple.
2509          */
2510         switch (sbp->s_magic) {
2511         case SMACK_MAGIC:
2512                 /*
2513                  * Casey says that it's a little embarrassing
2514                  * that the smack file system doesn't do
2515                  * extended attributes.
2516                  */
2517                 final = smack_known_star.smk_known;
2518                 break;
2519         case PIPEFS_MAGIC:
2520                 /*
2521                  * Casey says pipes are easy (?)
2522                  */
2523                 final = smack_known_star.smk_known;
2524                 break;
2525         case DEVPTS_SUPER_MAGIC:
2526                 /*
2527                  * devpts seems content with the label of the task.
2528                  * Programs that change smack have to treat the
2529                  * pty with respect.
2530                  */
2531                 final = csp;
2532                 break;
2533         case SOCKFS_MAGIC:
2534                 /*
2535                  * Socket access is controlled by the socket
2536                  * structures associated with the task involved.
2537                  */
2538                 final = smack_known_star.smk_known;
2539                 break;
2540         case PROC_SUPER_MAGIC:
2541                 /*
2542                  * Casey says procfs appears not to care.
2543                  * The superblock default suffices.
2544                  */
2545                 break;
2546         case TMPFS_MAGIC:
2547                 /*
2548                  * Device labels should come from the filesystem,
2549                  * but watch out, because they're volitile,
2550                  * getting recreated on every reboot.
2551                  */
2552                 final = smack_known_star.smk_known;
2553                 /*
2554                  * No break.
2555                  *
2556                  * If a smack value has been set we want to use it,
2557                  * but since tmpfs isn't giving us the opportunity
2558                  * to set mount options simulate setting the
2559                  * superblock default.
2560                  */
2561         default:
2562                 /*
2563                  * This isn't an understood special case.
2564                  * Get the value from the xattr.
2565                  */
2566 
2567                 /*
2568                  * UNIX domain sockets use lower level socket data.
2569                  */
2570                 if (S_ISSOCK(inode->i_mode)) {
2571                         final = smack_known_star.smk_known;
2572                         break;
2573                 }
2574                 /*
2575                  * No xattr support means, alas, no SMACK label.
2576                  * Use the aforeapplied default.
2577                  * It would be curious if the label of the task
2578                  * does not match that assigned.
2579                  */
2580                 if (inode->i_op->getxattr == NULL)
2581                         break;
2582                 /*
2583                  * Get the dentry for xattr.
2584                  */
2585                 dp = dget(opt_dentry);
2586                 fetched = smk_fetch(XATTR_NAME_SMACK, inode, dp);
2587                 if (fetched != NULL)
2588                         final = fetched;
2589 
2590                 /*
2591                  * Transmuting directory
2592                  */
2593                 if (S_ISDIR(inode->i_mode)) {
2594                         /*
2595                          * If this is a new directory and the label was
2596                          * transmuted when the inode was initialized
2597                          * set the transmute attribute on the directory
2598                          * and mark the inode.
2599                          *
2600                          * If there is a transmute attribute on the
2601                          * directory mark the inode.
2602                          */
2603                         if (isp->smk_flags & SMK_INODE_CHANGED) {
2604                                 isp->smk_flags &= ~SMK_INODE_CHANGED;
2605                                 rc = inode->i_op->setxattr(dp,
2606                                         XATTR_NAME_SMACKTRANSMUTE,
2607                                         TRANS_TRUE, TRANS_TRUE_SIZE,
2608                                         0);
2609                         } else {
2610                                 rc = inode->i_op->getxattr(dp,
2611                                         XATTR_NAME_SMACKTRANSMUTE, trattr,
2612                                         TRANS_TRUE_SIZE);
2613                                 if (rc >= 0 && strncmp(trattr, TRANS_TRUE,
2614                                                        TRANS_TRUE_SIZE) != 0)
2615                                         rc = -EINVAL;
2616                         }
2617                         if (rc >= 0)
2618                                 transflag = SMK_INODE_TRANSMUTE;
2619                 }
2620                 isp->smk_task = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp);
2621                 isp->smk_mmap = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp);
2622 
2623                 dput(dp);
2624                 break;
2625         }
2626 
2627         if (final == NULL)
2628                 isp->smk_inode = csp;
2629         else
2630                 isp->smk_inode = final;
2631 
2632         isp->smk_flags |= (SMK_INODE_INSTANT | transflag);
2633 
2634 unlockandout:
2635         mutex_unlock(&isp->smk_lock);
2636         return;
2637 }
2638 
2639 /**
2640  * smack_getprocattr - Smack process attribute access
2641  * @p: the object task
2642  * @name: the name of the attribute in /proc/.../attr
2643  * @value: where to put the result
2644  *
2645  * Places a copy of the task Smack into value
2646  *
2647  * Returns the length of the smack label or an error code
2648  */
2649 static int smack_getprocattr(struct task_struct *p, char *name, char **value)
2650 {
2651         char *cp;
2652         int slen;
2653 
2654         if (strcmp(name, "current") != 0)
2655                 return -EINVAL;
2656 
2657         cp = kstrdup(smk_of_task(task_security(p)), GFP_KERNEL);
2658         if (cp == NULL)
2659                 return -ENOMEM;
2660 
2661         slen = strlen(cp);
2662         *value = cp;
2663         return slen;
2664 }
2665 
2666 /**
2667  * smack_setprocattr - Smack process attribute setting
2668  * @p: the object task
2669  * @name: the name of the attribute in /proc/.../attr
2670  * @value: the value to set
2671  * @size: the size of the value
2672  *
2673  * Sets the Smack value of the task. Only setting self
2674  * is permitted and only with privilege
2675  *
2676  * Returns the length of the smack label or an error code
2677  */
2678 static int smack_setprocattr(struct task_struct *p, char *name,
2679                              void *value, size_t size)
2680 {
2681         struct task_smack *tsp;
2682         struct cred *new;
2683         char *newsmack;
2684 
2685         /*
2686          * Changing another process' Smack value is too dangerous
2687          * and supports no sane use case.
2688          */
2689         if (p != current)
2690                 return -EPERM;
2691 
2692         if (!smack_privileged(CAP_MAC_ADMIN))
2693                 return -EPERM;
2694 
2695         if (value == NULL || size == 0 || size >= SMK_LONGLABEL)
2696                 return -EINVAL;
2697 
2698         if (strcmp(name, "current") != 0)
2699                 return -EINVAL;
2700 
2701         newsmack = smk_import(value, size);
2702         if (newsmack == NULL)
2703                 return -EINVAL;
2704 
2705         /*
2706          * No process is ever allowed the web ("@") label.
2707          */
2708         if (newsmack == smack_known_web.smk_known)
2709                 return -EPERM;
2710 
2711         new = prepare_creds();
2712         if (new == NULL)
2713                 return -ENOMEM;
2714 
2715         tsp = new->security;
2716         tsp->smk_task = newsmack;
2717 
2718         commit_creds(new);
2719         return size;
2720 }
2721 
2722 /**
2723  * smack_unix_stream_connect - Smack access on UDS
2724  * @sock: one sock
2725  * @other: the other sock
2726  * @newsk: unused
2727  *
2728  * Return 0 if a subject with the smack of sock could access
2729  * an object with the smack of other, otherwise an error code
2730  */
2731 static int smack_unix_stream_connect(struct sock *sock,
2732                                      struct sock *other, struct sock *newsk)
2733 {
2734         struct socket_smack *ssp = sock->sk_security;
2735         struct socket_smack *osp = other->sk_security;
2736         struct socket_smack *nsp = newsk->sk_security;
2737         struct smk_audit_info ad;
2738         int rc = 0;
2739 
2740 #ifdef CONFIG_AUDIT
2741         struct lsm_network_audit net;
2742 
2743         smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
2744         smk_ad_setfield_u_net_sk(&ad, other);
2745 #endif
2746 
2747         if (!smack_privileged(CAP_MAC_OVERRIDE))
2748                 rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad);
2749 
2750         /*
2751          * Cross reference the peer labels for SO_PEERSEC.
2752          */
2753         if (rc == 0) {
2754                 nsp->smk_packet = ssp->smk_out;
2755                 ssp->smk_packet = osp->smk_out;
2756         }
2757 
2758         return rc;
2759 }
2760 
2761 /**
2762  * smack_unix_may_send - Smack access on UDS
2763  * @sock: one socket
2764  * @other: the other socket
2765  *
2766  * Return 0 if a subject with the smack of sock could access
2767  * an object with the smack of other, otherwise an error code
2768  */
2769 static int smack_unix_may_send(struct socket *sock, struct socket *other)
2770 {
2771         struct socket_smack *ssp = sock->sk->sk_security;
2772         struct socket_smack *osp = other->sk->sk_security;
2773         struct smk_audit_info ad;
2774         int rc = 0;
2775 
2776 #ifdef CONFIG_AUDIT
2777         struct lsm_network_audit net;
2778 
2779         smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
2780         smk_ad_setfield_u_net_sk(&ad, other->sk);
2781 #endif
2782 
2783         if (!smack_privileged(CAP_MAC_OVERRIDE))
2784                 rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad);
2785 
2786         return rc;
2787 }
2788 
2789 /**
2790  * smack_socket_sendmsg - Smack check based on destination host
2791  * @sock: the socket
2792  * @msg: the message
2793  * @size: the size of the message
2794  *
2795  * Return 0 if the current subject can write to the destination
2796  * host. This is only a question if the destination is a single
2797  * label host.
2798  */
2799 static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg,
2800                                 int size)
2801 {
2802         struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name;
2803 
2804         /*
2805          * Perfectly reasonable for this to be NULL
2806          */
2807         if (sip == NULL || sip->sin_family != AF_INET)
2808                 return 0;
2809 
2810         return smack_netlabel_send(sock->sk, sip);
2811 }
2812 
2813 /**
2814  * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
2815  * @sap: netlabel secattr
2816  * @ssp: socket security information
2817  *
2818  * Returns a pointer to a Smack label found on the label list.
2819  */
2820 static char *smack_from_secattr(struct netlbl_lsm_secattr *sap,
2821                                 struct socket_smack *ssp)
2822 {
2823         struct smack_known *kp;
2824         char *sp;
2825         int found = 0;
2826 
2827         if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) {
2828                 /*
2829                  * Looks like a CIPSO packet.
2830                  * If there are flags but no level netlabel isn't
2831                  * behaving the way we expect it to.
2832                  *
2833                  * Look it up in the label table
2834                  * Without guidance regarding the smack value
2835                  * for the packet fall back on the network
2836                  * ambient value.
2837                  */
2838                 rcu_read_lock();
2839                 list_for_each_entry(kp, &smack_known_list, list) {
2840                         if (sap->attr.mls.lvl != kp->smk_netlabel.attr.mls.lvl)
2841                                 continue;
2842                         if (memcmp(sap->attr.mls.cat,
2843                                 kp->smk_netlabel.attr.mls.cat,
2844                                 SMK_CIPSOLEN) != 0)
2845                                 continue;
2846                         found = 1;
2847                         break;
2848                 }
2849                 rcu_read_unlock();
2850 
2851                 if (found)
2852                         return kp->smk_known;
2853 
2854                 if (ssp != NULL && ssp->smk_in == smack_known_star.smk_known)
2855                         return smack_known_web.smk_known;
2856                 return smack_known_star.smk_known;
2857         }
2858         if ((sap->flags & NETLBL_SECATTR_SECID) != 0) {
2859                 /*
2860                  * Looks like a fallback, which gives us a secid.
2861                  */
2862                 sp = smack_from_secid(sap->attr.secid);
2863                 /*
2864                  * This has got to be a bug because it is
2865                  * impossible to specify a fallback without
2866                  * specifying the label, which will ensure
2867                  * it has a secid, and the only way to get a
2868                  * secid is from a fallback.
2869                  */
2870                 BUG_ON(sp == NULL);
2871                 return sp;
2872         }
2873         /*
2874          * Without guidance regarding the smack value
2875          * for the packet fall back on the network
2876          * ambient value.
2877          */
2878         return smack_net_ambient;
2879 }
2880 
2881 /**
2882  * smack_socket_sock_rcv_skb - Smack packet delivery access check
2883  * @sk: socket
2884  * @skb: packet
2885  *
2886  * Returns 0 if the packet should be delivered, an error code otherwise
2887  */
2888 static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
2889 {
2890         struct netlbl_lsm_secattr secattr;
2891         struct socket_smack *ssp = sk->sk_security;
2892         char *csp;
2893         int rc;
2894         struct smk_audit_info ad;
2895 #ifdef CONFIG_AUDIT
2896         struct lsm_network_audit net;
2897 #endif
2898         if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)
2899                 return 0;
2900 
2901         /*
2902          * Translate what netlabel gave us.
2903          */
2904         netlbl_secattr_init(&secattr);
2905 
2906         rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr);
2907         if (rc == 0)
2908                 csp = smack_from_secattr(&secattr, ssp);
2909         else
2910                 csp = smack_net_ambient;
2911 
2912         netlbl_secattr_destroy(&secattr);
2913 
2914 #ifdef CONFIG_AUDIT
2915         smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
2916         ad.a.u.net->family = sk->sk_family;
2917         ad.a.u.net->netif = skb->skb_iif;
2918         ipv4_skb_to_auditdata(skb, &ad.a, NULL);
2919 #endif
2920         /*
2921          * Receiving a packet requires that the other end
2922          * be able to write here. Read access is not required.
2923          * This is the simplist possible security model
2924          * for networking.
2925          */
2926         rc = smk_access(csp, ssp->smk_in, MAY_WRITE, &ad);
2927         if (rc != 0)
2928                 netlbl_skbuff_err(skb, rc, 0);
2929         return rc;
2930 }
2931 
2932 /**
2933  * smack_socket_getpeersec_stream - pull in packet label
2934  * @sock: the socket
2935  * @optval: user's destination
2936  * @optlen: size thereof
2937  * @len: max thereof
2938  *
2939  * returns zero on success, an error code otherwise
2940  */
2941 static int smack_socket_getpeersec_stream(struct socket *sock,
2942                                           char __user *optval,
2943                                           int __user *optlen, unsigned len)
2944 {
2945         struct socket_smack *ssp;
2946         char *rcp = "";
2947         int slen = 1;
2948         int rc = 0;
2949 
2950         ssp = sock->sk->sk_security;
2951         if (ssp->smk_packet != NULL) {
2952                 rcp = ssp->smk_packet;
2953                 slen = strlen(rcp) + 1;
2954         }
2955 
2956         if (slen > len)
2957                 rc = -ERANGE;
2958         else if (copy_to_user(optval, rcp, slen) != 0)
2959                 rc = -EFAULT;
2960 
2961         if (put_user(slen, optlen) != 0)
2962                 rc = -EFAULT;
2963 
2964         return rc;
2965 }
2966 
2967 
2968 /**
2969  * smack_socket_getpeersec_dgram - pull in packet label
2970  * @sock: the peer socket
2971  * @skb: packet data
2972  * @secid: pointer to where to put the secid of the packet
2973  *
2974  * Sets the netlabel socket state on sk from parent
2975  */
2976 static int smack_socket_getpeersec_dgram(struct socket *sock,
2977                                          struct sk_buff *skb, u32 *secid)
2978 
2979 {
2980         struct netlbl_lsm_secattr secattr;
2981         struct socket_smack *ssp = NULL;
2982         char *sp;
2983         int family = PF_UNSPEC;
2984         u32 s = 0;      /* 0 is the invalid secid */
2985         int rc;
2986 
2987         if (skb != NULL) {
2988                 if (skb->protocol == htons(ETH_P_IP))
2989                         family = PF_INET;
2990                 else if (skb->protocol == htons(ETH_P_IPV6))
2991                         family = PF_INET6;
2992         }
2993         if (family == PF_UNSPEC && sock != NULL)
2994                 family = sock->sk->sk_family;
2995 
2996         if (family == PF_UNIX) {
2997                 ssp = sock->sk->sk_security;
2998                 s = smack_to_secid(ssp->smk_out);
2999         } else if (family == PF_INET || family == PF_INET6) {
3000                 /*
3001                  * Translate what netlabel gave us.
3002                  */
3003                 if (sock != NULL && sock->sk != NULL)
3004                         ssp = sock->sk->sk_security;
3005                 netlbl_secattr_init(&secattr);
3006                 rc = netlbl_skbuff_getattr(skb, family, &secattr);
3007                 if (rc == 0) {
3008                         sp = smack_from_secattr(&secattr, ssp);
3009                         s = smack_to_secid(sp);
3010                 }
3011                 netlbl_secattr_destroy(&secattr);
3012         }
3013         *secid = s;
3014         if (s == 0)
3015                 return -EINVAL;
3016         return 0;
3017 }
3018 
3019 /**
3020  * smack_sock_graft - Initialize a newly created socket with an existing sock
3021  * @sk: child sock
3022  * @parent: parent socket
3023  *
3024  * Set the smk_{in,out} state of an existing sock based on the process that
3025  * is creating the new socket.
3026  */
3027 static void smack_sock_graft(struct sock *sk, struct socket *parent)
3028 {
3029         struct socket_smack *ssp;
3030 
3031         if (sk == NULL ||
3032             (sk->sk_family != PF_INET && sk->sk_family != PF_INET6))
3033                 return;
3034 
3035         ssp = sk->sk_security;
3036         ssp->smk_in = ssp->smk_out = smk_of_current();
3037         /* cssp->smk_packet is already set in smack_inet_csk_clone() */
3038 }
3039 
3040 /**
3041  * smack_inet_conn_request - Smack access check on connect
3042  * @sk: socket involved
3043  * @skb: packet
3044  * @req: unused
3045  *
3046  * Returns 0 if a task with the packet label could write to
3047  * the socket, otherwise an error code
3048  */
3049 static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
3050                                    struct request_sock *req)
3051 {
3052         u16 family = sk->sk_family;
3053         struct smack_known *skp;
3054         struct socket_smack *ssp = sk->sk_security;
3055         struct netlbl_lsm_secattr secattr;
3056         struct sockaddr_in addr;
3057         struct iphdr *hdr;
3058         char *sp;
3059         char *hsp;
3060         int rc;
3061         struct smk_audit_info ad;
3062 #ifdef CONFIG_AUDIT
3063         struct lsm_network_audit net;
3064 #endif
3065 
3066         /* handle mapped IPv4 packets arriving via IPv6 sockets */
3067         if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
3068                 family = PF_INET;
3069 
3070         netlbl_secattr_init(&secattr);
3071         rc = netlbl_skbuff_getattr(skb, family, &secattr);
3072         if (rc == 0)
3073                 sp = smack_from_secattr(&secattr, ssp);
3074         else
3075                 sp = smack_known_huh.smk_known;
3076         netlbl_secattr_destroy(&secattr);
3077 
3078 #ifdef CONFIG_AUDIT
3079         smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3080         ad.a.u.net->family = family;
3081         ad.a.u.net->netif = skb->skb_iif;
3082         ipv4_skb_to_auditdata(skb, &ad.a, NULL);
3083 #endif
3084         /*
3085          * Receiving a packet requires that the other end be able to write
3086          * here. Read access is not required.
3087          */
3088         rc = smk_access(sp, ssp->smk_in, MAY_WRITE, &ad);
3089         if (rc != 0)
3090                 return rc;
3091 
3092         /*
3093          * Save the peer's label in the request_sock so we can later setup
3094          * smk_packet in the child socket so that SO_PEERCRED can report it.
3095          */
3096         req->peer_secid = smack_to_secid(sp);
3097 
3098         /*
3099          * We need to decide if we want to label the incoming connection here
3100          * if we do we only need to label the request_sock and the stack will
3101          * propagate the wire-label to the sock when it is created.
3102          */
3103         hdr = ip_hdr(skb);
3104         addr.sin_addr.s_addr = hdr->saddr;
3105         rcu_read_lock();
3106         hsp = smack_host_label(&addr);
3107         rcu_read_unlock();
3108 
3109         if (hsp == NULL) {
3110                 skp = smk_find_entry(sp);
3111                 rc = netlbl_req_setattr(req, &skp->smk_netlabel);
3112         } else
3113                 netlbl_req_delattr(req);
3114 
3115         return rc;
3116 }
3117 
3118 /**
3119  * smack_inet_csk_clone - Copy the connection information to the new socket
3120  * @sk: the new socket
3121  * @req: the connection's request_sock
3122  *
3123  * Transfer the connection's peer label to the newly created socket.
3124  */
3125 static void smack_inet_csk_clone(struct sock *sk,
3126                                  const struct request_sock *req)
3127 {
3128         struct socket_smack *ssp = sk->sk_security;
3129 
3130         if (req->peer_secid != 0)
3131                 ssp->smk_packet = smack_from_secid(req->peer_secid);
3132         else
3133                 ssp->smk_packet = NULL;
3134 }
3135 
3136 /*
3137  * Key management security hooks
3138  *
3139  * Casey has not tested key support very heavily.
3140  * The permission check is most likely too restrictive.
3141  * If you care about keys please have a look.
3142  */
3143 #ifdef CONFIG_KEYS
3144 
3145 /**
3146  * smack_key_alloc - Set the key security blob
3147  * @key: object
3148  * @cred: the credentials to use
3149  * @flags: unused
3150  *
3151  * No allocation required
3152  *
3153  * Returns 0
3154  */
3155 static int smack_key_alloc(struct key *key, const struct cred *cred,
3156                            unsigned long flags)
3157 {
3158         key->security = smk_of_task(cred->security);
3159         return 0;
3160 }
3161 
3162 /**
3163  * smack_key_free - Clear the key security blob
3164  * @key: the object
3165  *
3166  * Clear the blob pointer
3167  */
3168 static void smack_key_free(struct key *key)
3169 {
3170         key->security = NULL;
3171 }
3172 
3173 /*
3174  * smack_key_permission - Smack access on a key
3175  * @key_ref: gets to the object
3176  * @cred: the credentials to use
3177  * @perm: unused
3178  *
3179  * Return 0 if the task has read and write to the object,
3180  * an error code otherwise
3181  */
3182 static int smack_key_permission(key_ref_t key_ref,
3183                                 const struct cred *cred, key_perm_t perm)
3184 {
3185         struct key *keyp;
3186         struct smk_audit_info ad;
3187         char *tsp = smk_of_task(cred->security);
3188 
3189         keyp = key_ref_to_ptr(key_ref);
3190         if (keyp == NULL)
3191                 return -EINVAL;
3192         /*
3193          * If the key hasn't been initialized give it access so that
3194          * it may do so.
3195          */
3196         if (keyp->security == NULL)
3197                 return 0;
3198         /*
3199          * This should not occur
3200          */
3201         if (tsp == NULL)
3202                 return -EACCES;
3203 #ifdef CONFIG_AUDIT
3204         smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY);
3205         ad.a.u.key_struct.key = keyp->serial;
3206         ad.a.u.key_struct.key_desc = keyp->description;
3207 #endif
3208         return smk_access(tsp, keyp->security,
3209                                  MAY_READWRITE, &ad);
3210 }
3211 #endif /* CONFIG_KEYS */
3212 
3213 /*
3214  * Smack Audit hooks
3215  *
3216  * Audit requires a unique representation of each Smack specific
3217  * rule. This unique representation is used to distinguish the
3218  * object to be audited from remaining kernel objects and also
3219  * works as a glue between the audit hooks.
3220  *
3221  * Since repository entries are added but never deleted, we'll use
3222  * the smack_known label address related to the given audit rule as
3223  * the needed unique representation. This also better fits the smack
3224  * model where nearly everything is a label.
3225  */
3226 #ifdef CONFIG_AUDIT
3227 
3228 /**
3229  * smack_audit_rule_init - Initialize a smack audit rule
3230  * @field: audit rule fields given from user-space (audit.h)
3231  * @op: required testing operator (=, !=, >, <, ...)
3232  * @rulestr: smack label to be audited
3233  * @vrule: pointer to save our own audit rule representation
3234  *
3235  * Prepare to audit cases where (@field @op @rulestr) is true.
3236  * The label to be audited is created if necessay.
3237  */
3238 static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
3239 {
3240         char **rule = (char **)vrule;
3241         *rule = NULL;
3242 
3243         if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
3244                 return -EINVAL;
3245 
3246         if (op != Audit_equal && op != Audit_not_equal)
3247                 return -EINVAL;
3248 
3249         *rule = smk_import(rulestr, 0);
3250 
3251         return 0;
3252 }
3253 
3254 /**
3255  * smack_audit_rule_known - Distinguish Smack audit rules
3256  * @krule: rule of interest, in Audit kernel representation format
3257  *
3258  * This is used to filter Smack rules from remaining Audit ones.
3259  * If it's proved that this rule belongs to us, the
3260  * audit_rule_match hook will be called to do the final judgement.
3261  */
3262 static int smack_audit_rule_known(struct audit_krule *krule)
3263 {
3264         struct audit_field *f;
3265         int i;
3266 
3267         for (i = 0; i < krule->field_count; i++) {
3268                 f = &krule->fields[i];
3269 
3270                 if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER)
3271                         return 1;
3272         }
3273 
3274         return 0;
3275 }
3276 
3277 /**
3278  * smack_audit_rule_match - Audit given object ?
3279  * @secid: security id for identifying the object to test
3280  * @field: audit rule flags given from user-space
3281  * @op: required testing operator
3282  * @vrule: smack internal rule presentation
3283  * @actx: audit context associated with the check
3284  *
3285  * The core Audit hook. It's used to take the decision of
3286  * whether to audit or not to audit a given object.
3287  */
3288 static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule,
3289                                   struct audit_context *actx)
3290 {
3291         char *smack;
3292         char *rule = vrule;
3293 
3294         if (!rule) {
3295                 audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR,
3296                           "Smack: missing rule\n");
3297                 return -ENOENT;
3298         }
3299 
3300         if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
3301                 return 0;
3302 
3303         smack = smack_from_secid(secid);
3304 
3305         /*
3306          * No need to do string comparisons. If a match occurs,
3307          * both pointers will point to the same smack_known
3308          * label.
3309          */
3310         if (op == Audit_equal)
3311                 return (rule == smack);
3312         if (op == Audit_not_equal)
3313                 return (rule != smack);
3314 
3315         return 0;
3316 }
3317 
3318 /**
3319  * smack_audit_rule_free - free smack rule representation
3320  * @vrule: rule to be freed.
3321  *
3322  * No memory was allocated.
3323  */
3324 static void smack_audit_rule_free(void *vrule)
3325 {
3326         /* No-op */
3327 }
3328 
3329 #endif /* CONFIG_AUDIT */
3330 
3331 /**
3332  * smack_secid_to_secctx - return the smack label for a secid
3333  * @secid: incoming integer
3334  * @secdata: destination
3335  * @seclen: how long it is
3336  *
3337  * Exists for networking code.
3338  */
3339 static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
3340 {
3341         char *sp = smack_from_secid(secid);
3342 
3343         if (secdata)
3344                 *secdata = sp;
3345         *seclen = strlen(sp);
3346         return 0;
3347 }
3348 
3349 /**
3350  * smack_secctx_to_secid - return the secid for a smack label
3351  * @secdata: smack label
3352  * @seclen: how long result is
3353  * @secid: outgoing integer
3354  *
3355  * Exists for audit and networking code.
3356  */
3357 static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
3358 {
3359         *secid = smack_to_secid(secdata);
3360         return 0;
3361 }
3362 
3363 /**
3364  * smack_release_secctx - don't do anything.
3365  * @secdata: unused
3366  * @seclen: unused
3367  *
3368  * Exists to make sure nothing gets done, and properly
3369  */
3370 static void smack_release_secctx(char *secdata, u32 seclen)
3371 {
3372 }
3373 
3374 static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
3375 {
3376         return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0);
3377 }
3378 
3379 static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
3380 {
3381         return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0);
3382 }
3383 
3384 static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
3385 {
3386         int len = 0;
3387         len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true);
3388 
3389         if (len < 0)
3390                 return len;
3391         *ctxlen = len;
3392         return 0;
3393 }
3394 
3395 struct security_operations smack_ops = {
3396         .name =                         "smack",
3397 
3398         .ptrace_access_check =          smack_ptrace_access_check,
3399         .ptrace_traceme =               smack_ptrace_traceme,
3400         .syslog =                       smack_syslog,
3401 
3402         .sb_alloc_security =            smack_sb_alloc_security,
3403         .sb_free_security =             smack_sb_free_security,
3404         .sb_copy_data =                 smack_sb_copy_data,
3405         .sb_kern_mount =                smack_sb_kern_mount,
3406         .sb_statfs =                    smack_sb_statfs,
3407         .sb_mount =                     smack_sb_mount,
3408         .sb_umount =                    smack_sb_umount,
3409 
3410         .bprm_set_creds =               smack_bprm_set_creds,
3411         .bprm_committing_creds =        smack_bprm_committing_creds,
3412         .bprm_secureexec =              smack_bprm_secureexec,
3413 
3414         .inode_alloc_security =         smack_inode_alloc_security,
3415         .inode_free_security =          smack_inode_free_security,
3416         .inode_init_security =          smack_inode_init_security,
3417         .inode_link =                   smack_inode_link,
3418         .inode_unlink =                 smack_inode_unlink,
3419         .inode_rmdir =                  smack_inode_rmdir,
3420         .inode_rename =                 smack_inode_rename,
3421         .inode_permission =             smack_inode_permission,
3422         .inode_setattr =                smack_inode_setattr,
3423         .inode_getattr =                smack_inode_getattr,
3424         .inode_setxattr =               smack_inode_setxattr,
3425         .inode_post_setxattr =          smack_inode_post_setxattr,
3426         .inode_getxattr =               smack_inode_getxattr,
3427         .inode_removexattr =            smack_inode_removexattr,
3428         .inode_getsecurity =            smack_inode_getsecurity,
3429         .inode_setsecurity =            smack_inode_setsecurity,
3430         .inode_listsecurity =           smack_inode_listsecurity,
3431         .inode_getsecid =               smack_inode_getsecid,
3432 
3433         .file_permission =              smack_file_permission,
3434         .file_alloc_security =          smack_file_alloc_security,
3435         .file_free_security =           smack_file_free_security,
3436         .file_ioctl =                   smack_file_ioctl,
3437         .file_lock =                    smack_file_lock,
3438         .file_fcntl =                   smack_file_fcntl,
3439         .mmap_file =                    smack_mmap_file,
3440         .mmap_addr =                    cap_mmap_addr,
3441         .file_set_fowner =              smack_file_set_fowner,
3442         .file_send_sigiotask =          smack_file_send_sigiotask,
3443         .file_receive =                 smack_file_receive,
3444 
3445         .file_open =                    smack_file_open,
3446 
3447         .cred_alloc_blank =             smack_cred_alloc_blank,
3448         .cred_free =                    smack_cred_free,
3449         .cred_prepare =                 smack_cred_prepare,
3450         .cred_transfer =                smack_cred_transfer,
3451         .kernel_act_as =                smack_kernel_act_as,
3452         .kernel_create_files_as =       smack_kernel_create_files_as,
3453         .task_setpgid =                 smack_task_setpgid,
3454         .task_getpgid =                 smack_task_getpgid,
3455         .task_getsid =                  smack_task_getsid,
3456         .task_getsecid =                smack_task_getsecid,
3457         .task_setnice =                 smack_task_setnice,
3458         .task_setioprio =               smack_task_setioprio,
3459         .task_getioprio =               smack_task_getioprio,
3460         .task_setscheduler =            smack_task_setscheduler,
3461         .task_getscheduler =            smack_task_getscheduler,
3462         .task_movememory =              smack_task_movememory,
3463         .task_kill =                    smack_task_kill,
3464         .task_wait =                    smack_task_wait,
3465         .task_to_inode =                smack_task_to_inode,
3466 
3467         .ipc_permission =               smack_ipc_permission,
3468         .ipc_getsecid =                 smack_ipc_getsecid,
3469 
3470         .msg_msg_alloc_security =       smack_msg_msg_alloc_security,
3471         .msg_msg_free_security =        smack_msg_msg_free_security,
3472 
3473         .msg_queue_alloc_security =     smack_msg_queue_alloc_security,
3474         .msg_queue_free_security =      smack_msg_queue_free_security,
3475         .msg_queue_associate =          smack_msg_queue_associate,
3476         .msg_queue_msgctl =             smack_msg_queue_msgctl,
3477         .msg_queue_msgsnd =             smack_msg_queue_msgsnd,
3478         .msg_queue_msgrcv =             smack_msg_queue_msgrcv,
3479 
3480         .shm_alloc_security =           smack_shm_alloc_security,
3481         .shm_free_security =            smack_shm_free_security,
3482         .shm_associate =                smack_shm_associate,
3483         .shm_shmctl =                   smack_shm_shmctl,
3484         .shm_shmat =                    smack_shm_shmat,
3485 
3486         .sem_alloc_security =           smack_sem_alloc_security,
3487         .sem_free_security =            smack_sem_free_security,
3488         .sem_associate =                smack_sem_associate,
3489         .sem_semctl =                   smack_sem_semctl,
3490         .sem_semop =                    smack_sem_semop,
3491 
3492         .d_instantiate =                smack_d_instantiate,
3493 
3494         .getprocattr =                  smack_getprocattr,
3495         .setprocattr =                  smack_setprocattr,
3496 
3497         .unix_stream_connect =          smack_unix_stream_connect,
3498         .unix_may_send =                smack_unix_may_send,
3499 
3500         .socket_post_create =           smack_socket_post_create,
3501         .socket_connect =               smack_socket_connect,
3502         .socket_sendmsg =               smack_socket_sendmsg,
3503         .socket_sock_rcv_skb =          smack_socket_sock_rcv_skb,
3504         .socket_getpeersec_stream =     smack_socket_getpeersec_stream,
3505         .socket_getpeersec_dgram =      smack_socket_getpeersec_dgram,
3506         .sk_alloc_security =            smack_sk_alloc_security,
3507         .sk_free_security =             smack_sk_free_security,
3508         .sock_graft =                   smack_sock_graft,
3509         .inet_conn_request =            smack_inet_conn_request,
3510         .inet_csk_clone =               smack_inet_csk_clone,
3511 
3512  /* key management security hooks */
3513 #ifdef CONFIG_KEYS
3514         .key_alloc =                    smack_key_alloc,
3515         .key_free =                     smack_key_free,
3516         .key_permission =               smack_key_permission,
3517 #endif /* CONFIG_KEYS */
3518 
3519  /* Audit hooks */
3520 #ifdef CONFIG_AUDIT
3521         .audit_rule_init =              smack_audit_rule_init,
3522         .audit_rule_known =             smack_audit_rule_known,
3523         .audit_rule_match =             smack_audit_rule_match,
3524         .audit_rule_free =              smack_audit_rule_free,
3525 #endif /* CONFIG_AUDIT */
3526 
3527         .secid_to_secctx =              smack_secid_to_secctx,
3528         .secctx_to_secid =              smack_secctx_to_secid,
3529         .release_secctx =               smack_release_secctx,
3530         .inode_notifysecctx =           smack_inode_notifysecctx,
3531         .inode_setsecctx =              smack_inode_setsecctx,
3532         .inode_getsecctx =              smack_inode_getsecctx,
3533 };
3534 
3535 
3536 static __init void init_smack_known_list(void)
3537 {
3538         /*
3539          * Initialize rule list locks
3540          */
3541         mutex_init(&smack_known_huh.smk_rules_lock);
3542         mutex_init(&smack_known_hat.smk_rules_lock);
3543         mutex_init(&smack_known_floor.smk_rules_lock);
3544         mutex_init(&smack_known_star.smk_rules_lock);
3545         mutex_init(&smack_known_invalid.smk_rules_lock);
3546         mutex_init(&smack_known_web.smk_rules_lock);
3547         /*
3548          * Initialize rule lists
3549          */
3550         INIT_LIST_HEAD(&smack_known_huh.smk_rules);
3551         INIT_LIST_HEAD(&smack_known_hat.smk_rules);
3552         INIT_LIST_HEAD(&smack_known_star.smk_rules);
3553         INIT_LIST_HEAD(&smack_known_floor.smk_rules);
3554         INIT_LIST_HEAD(&smack_known_invalid.smk_rules);
3555         INIT_LIST_HEAD(&smack_known_web.smk_rules);
3556         /*
3557          * Create the known labels list
3558          */
3559         list_add(&smack_known_huh.list, &smack_known_list);
3560         list_add(&smack_known_hat.list, &smack_known_list);
3561         list_add(&smack_known_star.list, &smack_known_list);
3562         list_add(&smack_known_floor.list, &smack_known_list);
3563         list_add(&smack_known_invalid.list, &smack_known_list);
3564         list_add(&smack_known_web.list, &smack_known_list);
3565 }
3566 
3567 /**
3568  * smack_init - initialize the smack system
3569  *
3570  * Returns 0
3571  */
3572 static __init int smack_init(void)
3573 {
3574         struct cred *cred;
3575         struct task_smack *tsp;
3576 
3577         if (!security_module_enable(&smack_ops))
3578                 return 0;
3579 
3580         tsp = new_task_smack(smack_known_floor.smk_known,
3581                                 smack_known_floor.smk_known, GFP_KERNEL);
3582         if (tsp == NULL)
3583                 return -ENOMEM;
3584 
3585         printk(KERN_INFO "Smack:  Initializing.\n");
3586 
3587         /*
3588          * Set the security state for the initial task.
3589          */
3590         cred = (struct cred *) current->cred;
3591         cred->security = tsp;
3592 
3593         /* initialize the smack_known_list */
3594         init_smack_known_list();
3595 
3596         /*
3597          * Register with LSM
3598          */
3599         if (register_security(&smack_ops))
3600                 panic("smack: Unable to register with kernel.\n");
3601 
3602         return 0;
3603 }
3604 
3605 /*
3606  * Smack requires early initialization in order to label
3607  * all processes and objects when they are created.
3608  */
3609 security_initcall(smack_init);
3610 

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