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Linux/security/smack/smackfs.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
  4  *
  5  * Authors:
  6  *      Casey Schaufler <casey@schaufler-ca.com>
  7  *      Ahmed S. Darwish <darwish.07@gmail.com>
  8  *
  9  * Special thanks to the authors of selinuxfs.
 10  *
 11  *      Karl MacMillan <kmacmillan@tresys.com>
 12  *      James Morris <jmorris@redhat.com>
 13  */
 14 
 15 #include <linux/kernel.h>
 16 #include <linux/vmalloc.h>
 17 #include <linux/security.h>
 18 #include <linux/mutex.h>
 19 #include <linux/slab.h>
 20 #include <net/net_namespace.h>
 21 #include <net/cipso_ipv4.h>
 22 #include <linux/seq_file.h>
 23 #include <linux/ctype.h>
 24 #include <linux/audit.h>
 25 #include <linux/magic.h>
 26 #include <linux/fs_context.h>
 27 #include "smack.h"
 28 
 29 #define BEBITS  (sizeof(__be32) * 8)
 30 /*
 31  * smackfs pseudo filesystem.
 32  */
 33 
 34 enum smk_inos {
 35         SMK_ROOT_INO    = 2,
 36         SMK_LOAD        = 3,    /* load policy */
 37         SMK_CIPSO       = 4,    /* load label -> CIPSO mapping */
 38         SMK_DOI         = 5,    /* CIPSO DOI */
 39         SMK_DIRECT      = 6,    /* CIPSO level indicating direct label */
 40         SMK_AMBIENT     = 7,    /* internet ambient label */
 41         SMK_NET4ADDR    = 8,    /* single label hosts */
 42         SMK_ONLYCAP     = 9,    /* the only "capable" label */
 43         SMK_LOGGING     = 10,   /* logging */
 44         SMK_LOAD_SELF   = 11,   /* task specific rules */
 45         SMK_ACCESSES    = 12,   /* access policy */
 46         SMK_MAPPED      = 13,   /* CIPSO level indicating mapped label */
 47         SMK_LOAD2       = 14,   /* load policy with long labels */
 48         SMK_LOAD_SELF2  = 15,   /* load task specific rules with long labels */
 49         SMK_ACCESS2     = 16,   /* make an access check with long labels */
 50         SMK_CIPSO2      = 17,   /* load long label -> CIPSO mapping */
 51         SMK_REVOKE_SUBJ = 18,   /* set rules with subject label to '-' */
 52         SMK_CHANGE_RULE = 19,   /* change or add rules (long labels) */
 53         SMK_SYSLOG      = 20,   /* change syslog label) */
 54         SMK_PTRACE      = 21,   /* set ptrace rule */
 55 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
 56         SMK_UNCONFINED  = 22,   /* define an unconfined label */
 57 #endif
 58 #if IS_ENABLED(CONFIG_IPV6)
 59         SMK_NET6ADDR    = 23,   /* single label IPv6 hosts */
 60 #endif /* CONFIG_IPV6 */
 61         SMK_RELABEL_SELF = 24, /* relabel possible without CAP_MAC_ADMIN */
 62 };
 63 
 64 /*
 65  * List locks
 66  */
 67 static DEFINE_MUTEX(smack_cipso_lock);
 68 static DEFINE_MUTEX(smack_ambient_lock);
 69 static DEFINE_MUTEX(smk_net4addr_lock);
 70 #if IS_ENABLED(CONFIG_IPV6)
 71 static DEFINE_MUTEX(smk_net6addr_lock);
 72 #endif /* CONFIG_IPV6 */
 73 
 74 /*
 75  * This is the "ambient" label for network traffic.
 76  * If it isn't somehow marked, use this.
 77  * It can be reset via smackfs/ambient
 78  */
 79 struct smack_known *smack_net_ambient;
 80 
 81 /*
 82  * This is the level in a CIPSO header that indicates a
 83  * smack label is contained directly in the category set.
 84  * It can be reset via smackfs/direct
 85  */
 86 int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT;
 87 
 88 /*
 89  * This is the level in a CIPSO header that indicates a
 90  * secid is contained directly in the category set.
 91  * It can be reset via smackfs/mapped
 92  */
 93 int smack_cipso_mapped = SMACK_CIPSO_MAPPED_DEFAULT;
 94 
 95 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
 96 /*
 97  * Allow one label to be unconfined. This is for
 98  * debugging and application bring-up purposes only.
 99  * It is bad and wrong, but everyone seems to expect
100  * to have it.
101  */
102 struct smack_known *smack_unconfined;
103 #endif
104 
105 /*
106  * If this value is set restrict syslog use to the label specified.
107  * It can be reset via smackfs/syslog
108  */
109 struct smack_known *smack_syslog_label;
110 
111 /*
112  * Ptrace current rule
113  * SMACK_PTRACE_DEFAULT    regular smack ptrace rules (/proc based)
114  * SMACK_PTRACE_EXACT      labels must match, but can be overriden with
115  *                         CAP_SYS_PTRACE
116  * SMACK_PTRACE_DRACONIAN  lables must match, CAP_SYS_PTRACE has no effect
117  */
118 int smack_ptrace_rule = SMACK_PTRACE_DEFAULT;
119 
120 /*
121  * Certain IP addresses may be designated as single label hosts.
122  * Packets are sent there unlabeled, but only from tasks that
123  * can write to the specified label.
124  */
125 
126 LIST_HEAD(smk_net4addr_list);
127 #if IS_ENABLED(CONFIG_IPV6)
128 LIST_HEAD(smk_net6addr_list);
129 #endif /* CONFIG_IPV6 */
130 
131 /*
132  * Rule lists are maintained for each label.
133  */
134 struct smack_parsed_rule {
135         struct smack_known      *smk_subject;
136         struct smack_known      *smk_object;
137         int                     smk_access1;
138         int                     smk_access2;
139 };
140 
141 static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT;
142 
143 /*
144  * Values for parsing cipso rules
145  * SMK_DIGITLEN: Length of a digit field in a rule.
146  * SMK_CIPSOMIN: Minimum possible cipso rule length.
147  * SMK_CIPSOMAX: Maximum possible cipso rule length.
148  */
149 #define SMK_DIGITLEN 4
150 #define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN)
151 #define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN)
152 
153 /*
154  * Values for parsing MAC rules
155  * SMK_ACCESS: Maximum possible combination of access permissions
156  * SMK_ACCESSLEN: Maximum length for a rule access field
157  * SMK_LOADLEN: Smack rule length
158  */
159 #define SMK_OACCESS     "rwxa"
160 #define SMK_ACCESS      "rwxatl"
161 #define SMK_OACCESSLEN  (sizeof(SMK_OACCESS) - 1)
162 #define SMK_ACCESSLEN   (sizeof(SMK_ACCESS) - 1)
163 #define SMK_OLOADLEN    (SMK_LABELLEN + SMK_LABELLEN + SMK_OACCESSLEN)
164 #define SMK_LOADLEN     (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN)
165 
166 /*
167  * Stricly for CIPSO level manipulation.
168  * Set the category bit number in a smack label sized buffer.
169  */
170 static inline void smack_catset_bit(unsigned int cat, char *catsetp)
171 {
172         if (cat == 0 || cat > (SMK_CIPSOLEN * 8))
173                 return;
174 
175         catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8);
176 }
177 
178 /**
179  * smk_netlabel_audit_set - fill a netlbl_audit struct
180  * @nap: structure to fill
181  */
182 static void smk_netlabel_audit_set(struct netlbl_audit *nap)
183 {
184         struct smack_known *skp = smk_of_current();
185 
186         nap->loginuid = audit_get_loginuid(current);
187         nap->sessionid = audit_get_sessionid(current);
188         nap->secid = skp->smk_secid;
189 }
190 
191 /*
192  * Value for parsing single label host rules
193  * "1.2.3.4 X"
194  */
195 #define SMK_NETLBLADDRMIN       9
196 
197 /**
198  * smk_set_access - add a rule to the rule list or replace an old rule
199  * @srp: the rule to add or replace
200  * @rule_list: the list of rules
201  * @rule_lock: the rule list lock
202  *
203  * Looks through the current subject/object/access list for
204  * the subject/object pair and replaces the access that was
205  * there. If the pair isn't found add it with the specified
206  * access.
207  *
208  * Returns 0 if nothing goes wrong or -ENOMEM if it fails
209  * during the allocation of the new pair to add.
210  */
211 static int smk_set_access(struct smack_parsed_rule *srp,
212                                 struct list_head *rule_list,
213                                 struct mutex *rule_lock)
214 {
215         struct smack_rule *sp;
216         int found = 0;
217         int rc = 0;
218 
219         mutex_lock(rule_lock);
220 
221         /*
222          * Because the object label is less likely to match
223          * than the subject label check it first
224          */
225         list_for_each_entry_rcu(sp, rule_list, list) {
226                 if (sp->smk_object == srp->smk_object &&
227                     sp->smk_subject == srp->smk_subject) {
228                         found = 1;
229                         sp->smk_access |= srp->smk_access1;
230                         sp->smk_access &= ~srp->smk_access2;
231                         break;
232                 }
233         }
234 
235         if (found == 0) {
236                 sp = kmem_cache_zalloc(smack_rule_cache, GFP_KERNEL);
237                 if (sp == NULL) {
238                         rc = -ENOMEM;
239                         goto out;
240                 }
241 
242                 sp->smk_subject = srp->smk_subject;
243                 sp->smk_object = srp->smk_object;
244                 sp->smk_access = srp->smk_access1 & ~srp->smk_access2;
245 
246                 list_add_rcu(&sp->list, rule_list);
247         }
248 
249 out:
250         mutex_unlock(rule_lock);
251         return rc;
252 }
253 
254 /**
255  * smk_perm_from_str - parse smack accesses from a text string
256  * @string: a text string that contains a Smack accesses code
257  *
258  * Returns an integer with respective bits set for specified accesses.
259  */
260 static int smk_perm_from_str(const char *string)
261 {
262         int perm = 0;
263         const char *cp;
264 
265         for (cp = string; ; cp++)
266                 switch (*cp) {
267                 case '-':
268                         break;
269                 case 'r':
270                 case 'R':
271                         perm |= MAY_READ;
272                         break;
273                 case 'w':
274                 case 'W':
275                         perm |= MAY_WRITE;
276                         break;
277                 case 'x':
278                 case 'X':
279                         perm |= MAY_EXEC;
280                         break;
281                 case 'a':
282                 case 'A':
283                         perm |= MAY_APPEND;
284                         break;
285                 case 't':
286                 case 'T':
287                         perm |= MAY_TRANSMUTE;
288                         break;
289                 case 'l':
290                 case 'L':
291                         perm |= MAY_LOCK;
292                         break;
293                 case 'b':
294                 case 'B':
295                         perm |= MAY_BRINGUP;
296                         break;
297                 default:
298                         return perm;
299                 }
300 }
301 
302 /**
303  * smk_fill_rule - Fill Smack rule from strings
304  * @subject: subject label string
305  * @object: object label string
306  * @access1: access string
307  * @access2: string with permissions to be removed
308  * @rule: Smack rule
309  * @import: if non-zero, import labels
310  * @len: label length limit
311  *
312  * Returns 0 on success, appropriate error code on failure.
313  */
314 static int smk_fill_rule(const char *subject, const char *object,
315                                 const char *access1, const char *access2,
316                                 struct smack_parsed_rule *rule, int import,
317                                 int len)
318 {
319         const char *cp;
320         struct smack_known *skp;
321 
322         if (import) {
323                 rule->smk_subject = smk_import_entry(subject, len);
324                 if (IS_ERR(rule->smk_subject))
325                         return PTR_ERR(rule->smk_subject);
326 
327                 rule->smk_object = smk_import_entry(object, len);
328                 if (IS_ERR(rule->smk_object))
329                         return PTR_ERR(rule->smk_object);
330         } else {
331                 cp = smk_parse_smack(subject, len);
332                 if (IS_ERR(cp))
333                         return PTR_ERR(cp);
334                 skp = smk_find_entry(cp);
335                 kfree(cp);
336                 if (skp == NULL)
337                         return -ENOENT;
338                 rule->smk_subject = skp;
339 
340                 cp = smk_parse_smack(object, len);
341                 if (IS_ERR(cp))
342                         return PTR_ERR(cp);
343                 skp = smk_find_entry(cp);
344                 kfree(cp);
345                 if (skp == NULL)
346                         return -ENOENT;
347                 rule->smk_object = skp;
348         }
349 
350         rule->smk_access1 = smk_perm_from_str(access1);
351         if (access2)
352                 rule->smk_access2 = smk_perm_from_str(access2);
353         else
354                 rule->smk_access2 = ~rule->smk_access1;
355 
356         return 0;
357 }
358 
359 /**
360  * smk_parse_rule - parse Smack rule from load string
361  * @data: string to be parsed whose size is SMK_LOADLEN
362  * @rule: Smack rule
363  * @import: if non-zero, import labels
364  *
365  * Returns 0 on success, -1 on errors.
366  */
367 static int smk_parse_rule(const char *data, struct smack_parsed_rule *rule,
368                                 int import)
369 {
370         int rc;
371 
372         rc = smk_fill_rule(data, data + SMK_LABELLEN,
373                            data + SMK_LABELLEN + SMK_LABELLEN, NULL, rule,
374                            import, SMK_LABELLEN);
375         return rc;
376 }
377 
378 /**
379  * smk_parse_long_rule - parse Smack rule from rule string
380  * @data: string to be parsed, null terminated
381  * @rule: Will be filled with Smack parsed rule
382  * @import: if non-zero, import labels
383  * @tokens: numer of substrings expected in data
384  *
385  * Returns number of processed bytes on success, -ERRNO on failure.
386  */
387 static ssize_t smk_parse_long_rule(char *data, struct smack_parsed_rule *rule,
388                                 int import, int tokens)
389 {
390         ssize_t cnt = 0;
391         char *tok[4];
392         int rc;
393         int i;
394 
395         /*
396          * Parsing the rule in-place, filling all white-spaces with '\0'
397          */
398         for (i = 0; i < tokens; ++i) {
399                 while (isspace(data[cnt]))
400                         data[cnt++] = '\0';
401 
402                 if (data[cnt] == '\0')
403                         /* Unexpected end of data */
404                         return -EINVAL;
405 
406                 tok[i] = data + cnt;
407 
408                 while (data[cnt] && !isspace(data[cnt]))
409                         ++cnt;
410         }
411         while (isspace(data[cnt]))
412                 data[cnt++] = '\0';
413 
414         while (i < 4)
415                 tok[i++] = NULL;
416 
417         rc = smk_fill_rule(tok[0], tok[1], tok[2], tok[3], rule, import, 0);
418         return rc == 0 ? cnt : rc;
419 }
420 
421 #define SMK_FIXED24_FMT 0       /* Fixed 24byte label format */
422 #define SMK_LONG_FMT    1       /* Variable long label format */
423 #define SMK_CHANGE_FMT  2       /* Rule modification format */
424 /**
425  * smk_write_rules_list - write() for any /smack rule file
426  * @file: file pointer, not actually used
427  * @buf: where to get the data from
428  * @count: bytes sent
429  * @ppos: where to start - must be 0
430  * @rule_list: the list of rules to write to
431  * @rule_lock: lock for the rule list
432  * @format: /smack/load or /smack/load2 or /smack/change-rule format.
433  *
434  * Get one smack access rule from above.
435  * The format for SMK_LONG_FMT is:
436  *      "subject<whitespace>object<whitespace>access[<whitespace>...]"
437  * The format for SMK_FIXED24_FMT is exactly:
438  *      "subject                 object                  rwxat"
439  * The format for SMK_CHANGE_FMT is:
440  *      "subject<whitespace>object<whitespace>
441  *       acc_enable<whitespace>acc_disable[<whitespace>...]"
442  */
443 static ssize_t smk_write_rules_list(struct file *file, const char __user *buf,
444                                         size_t count, loff_t *ppos,
445                                         struct list_head *rule_list,
446                                         struct mutex *rule_lock, int format)
447 {
448         struct smack_parsed_rule rule;
449         char *data;
450         int rc;
451         int trunc = 0;
452         int tokens;
453         ssize_t cnt = 0;
454 
455         /*
456          * No partial writes.
457          * Enough data must be present.
458          */
459         if (*ppos != 0)
460                 return -EINVAL;
461 
462         if (format == SMK_FIXED24_FMT) {
463                 /*
464                  * Minor hack for backward compatibility
465                  */
466                 if (count < SMK_OLOADLEN || count > SMK_LOADLEN)
467                         return -EINVAL;
468         } else {
469                 if (count >= PAGE_SIZE) {
470                         count = PAGE_SIZE - 1;
471                         trunc = 1;
472                 }
473         }
474 
475         data = memdup_user_nul(buf, count);
476         if (IS_ERR(data))
477                 return PTR_ERR(data);
478 
479         /*
480          * In case of parsing only part of user buf,
481          * avoid having partial rule at the data buffer
482          */
483         if (trunc) {
484                 while (count > 0 && (data[count - 1] != '\n'))
485                         --count;
486                 if (count == 0) {
487                         rc = -EINVAL;
488                         goto out;
489                 }
490         }
491 
492         data[count] = '\0';
493         tokens = (format == SMK_CHANGE_FMT ? 4 : 3);
494         while (cnt < count) {
495                 if (format == SMK_FIXED24_FMT) {
496                         rc = smk_parse_rule(data, &rule, 1);
497                         if (rc < 0)
498                                 goto out;
499                         cnt = count;
500                 } else {
501                         rc = smk_parse_long_rule(data + cnt, &rule, 1, tokens);
502                         if (rc < 0)
503                                 goto out;
504                         if (rc == 0) {
505                                 rc = -EINVAL;
506                                 goto out;
507                         }
508                         cnt += rc;
509                 }
510 
511                 if (rule_list == NULL)
512                         rc = smk_set_access(&rule, &rule.smk_subject->smk_rules,
513                                 &rule.smk_subject->smk_rules_lock);
514                 else
515                         rc = smk_set_access(&rule, rule_list, rule_lock);
516 
517                 if (rc)
518                         goto out;
519         }
520 
521         rc = cnt;
522 out:
523         kfree(data);
524         return rc;
525 }
526 
527 /*
528  * Core logic for smackfs seq list operations.
529  */
530 
531 static void *smk_seq_start(struct seq_file *s, loff_t *pos,
532                                 struct list_head *head)
533 {
534         struct list_head *list;
535         int i = *pos;
536 
537         rcu_read_lock();
538         for (list = rcu_dereference(list_next_rcu(head));
539                 list != head;
540                 list = rcu_dereference(list_next_rcu(list))) {
541                 if (i-- == 0)
542                         return list;
543         }
544 
545         return NULL;
546 }
547 
548 static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos,
549                                 struct list_head *head)
550 {
551         struct list_head *list = v;
552 
553         ++*pos;
554         list = rcu_dereference(list_next_rcu(list));
555 
556         return (list == head) ? NULL : list;
557 }
558 
559 static void smk_seq_stop(struct seq_file *s, void *v)
560 {
561         rcu_read_unlock();
562 }
563 
564 static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max)
565 {
566         /*
567          * Don't show any rules with label names too long for
568          * interface file (/smack/load or /smack/load2)
569          * because you should expect to be able to write
570          * anything you read back.
571          */
572         if (strlen(srp->smk_subject->smk_known) >= max ||
573             strlen(srp->smk_object->smk_known) >= max)
574                 return;
575 
576         if (srp->smk_access == 0)
577                 return;
578 
579         seq_printf(s, "%s %s",
580                    srp->smk_subject->smk_known,
581                    srp->smk_object->smk_known);
582 
583         seq_putc(s, ' ');
584 
585         if (srp->smk_access & MAY_READ)
586                 seq_putc(s, 'r');
587         if (srp->smk_access & MAY_WRITE)
588                 seq_putc(s, 'w');
589         if (srp->smk_access & MAY_EXEC)
590                 seq_putc(s, 'x');
591         if (srp->smk_access & MAY_APPEND)
592                 seq_putc(s, 'a');
593         if (srp->smk_access & MAY_TRANSMUTE)
594                 seq_putc(s, 't');
595         if (srp->smk_access & MAY_LOCK)
596                 seq_putc(s, 'l');
597         if (srp->smk_access & MAY_BRINGUP)
598                 seq_putc(s, 'b');
599 
600         seq_putc(s, '\n');
601 }
602 
603 /*
604  * Seq_file read operations for /smack/load
605  */
606 
607 static void *load2_seq_start(struct seq_file *s, loff_t *pos)
608 {
609         return smk_seq_start(s, pos, &smack_known_list);
610 }
611 
612 static void *load2_seq_next(struct seq_file *s, void *v, loff_t *pos)
613 {
614         return smk_seq_next(s, v, pos, &smack_known_list);
615 }
616 
617 static int load_seq_show(struct seq_file *s, void *v)
618 {
619         struct list_head *list = v;
620         struct smack_rule *srp;
621         struct smack_known *skp =
622                 list_entry_rcu(list, struct smack_known, list);
623 
624         list_for_each_entry_rcu(srp, &skp->smk_rules, list)
625                 smk_rule_show(s, srp, SMK_LABELLEN);
626 
627         return 0;
628 }
629 
630 static const struct seq_operations load_seq_ops = {
631         .start = load2_seq_start,
632         .next  = load2_seq_next,
633         .show  = load_seq_show,
634         .stop  = smk_seq_stop,
635 };
636 
637 /**
638  * smk_open_load - open() for /smack/load
639  * @inode: inode structure representing file
640  * @file: "load" file pointer
641  *
642  * For reading, use load_seq_* seq_file reading operations.
643  */
644 static int smk_open_load(struct inode *inode, struct file *file)
645 {
646         return seq_open(file, &load_seq_ops);
647 }
648 
649 /**
650  * smk_write_load - write() for /smack/load
651  * @file: file pointer, not actually used
652  * @buf: where to get the data from
653  * @count: bytes sent
654  * @ppos: where to start - must be 0
655  *
656  */
657 static ssize_t smk_write_load(struct file *file, const char __user *buf,
658                               size_t count, loff_t *ppos)
659 {
660         /*
661          * Must have privilege.
662          * No partial writes.
663          * Enough data must be present.
664          */
665         if (!smack_privileged(CAP_MAC_ADMIN))
666                 return -EPERM;
667 
668         return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
669                                     SMK_FIXED24_FMT);
670 }
671 
672 static const struct file_operations smk_load_ops = {
673         .open           = smk_open_load,
674         .read           = seq_read,
675         .llseek         = seq_lseek,
676         .write          = smk_write_load,
677         .release        = seq_release,
678 };
679 
680 /**
681  * smk_cipso_doi - initialize the CIPSO domain
682  */
683 static void smk_cipso_doi(void)
684 {
685         int rc;
686         struct cipso_v4_doi *doip;
687         struct netlbl_audit nai;
688 
689         smk_netlabel_audit_set(&nai);
690 
691         rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai);
692         if (rc != 0)
693                 printk(KERN_WARNING "%s:%d remove rc = %d\n",
694                        __func__, __LINE__, rc);
695 
696         doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL);
697         if (doip == NULL)
698                 panic("smack:  Failed to initialize cipso DOI.\n");
699         doip->map.std = NULL;
700         doip->doi = smk_cipso_doi_value;
701         doip->type = CIPSO_V4_MAP_PASS;
702         doip->tags[0] = CIPSO_V4_TAG_RBITMAP;
703         for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++)
704                 doip->tags[rc] = CIPSO_V4_TAG_INVALID;
705 
706         rc = netlbl_cfg_cipsov4_add(doip, &nai);
707         if (rc != 0) {
708                 printk(KERN_WARNING "%s:%d cipso add rc = %d\n",
709                        __func__, __LINE__, rc);
710                 kfree(doip);
711                 return;
712         }
713         rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai);
714         if (rc != 0) {
715                 printk(KERN_WARNING "%s:%d map add rc = %d\n",
716                        __func__, __LINE__, rc);
717                 kfree(doip);
718                 return;
719         }
720 }
721 
722 /**
723  * smk_unlbl_ambient - initialize the unlabeled domain
724  * @oldambient: previous domain string
725  */
726 static void smk_unlbl_ambient(char *oldambient)
727 {
728         int rc;
729         struct netlbl_audit nai;
730 
731         smk_netlabel_audit_set(&nai);
732 
733         if (oldambient != NULL) {
734                 rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai);
735                 if (rc != 0)
736                         printk(KERN_WARNING "%s:%d remove rc = %d\n",
737                                __func__, __LINE__, rc);
738         }
739         if (smack_net_ambient == NULL)
740                 smack_net_ambient = &smack_known_floor;
741 
742         rc = netlbl_cfg_unlbl_map_add(smack_net_ambient->smk_known, PF_INET,
743                                       NULL, NULL, &nai);
744         if (rc != 0)
745                 printk(KERN_WARNING "%s:%d add rc = %d\n",
746                        __func__, __LINE__, rc);
747 }
748 
749 /*
750  * Seq_file read operations for /smack/cipso
751  */
752 
753 static void *cipso_seq_start(struct seq_file *s, loff_t *pos)
754 {
755         return smk_seq_start(s, pos, &smack_known_list);
756 }
757 
758 static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
759 {
760         return smk_seq_next(s, v, pos, &smack_known_list);
761 }
762 
763 /*
764  * Print cipso labels in format:
765  * label level[/cat[,cat]]
766  */
767 static int cipso_seq_show(struct seq_file *s, void *v)
768 {
769         struct list_head  *list = v;
770         struct smack_known *skp =
771                 list_entry_rcu(list, struct smack_known, list);
772         struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
773         char sep = '/';
774         int i;
775 
776         /*
777          * Don't show a label that could not have been set using
778          * /smack/cipso. This is in support of the notion that
779          * anything read from /smack/cipso ought to be writeable
780          * to /smack/cipso.
781          *
782          * /smack/cipso2 should be used instead.
783          */
784         if (strlen(skp->smk_known) >= SMK_LABELLEN)
785                 return 0;
786 
787         seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
788 
789         for (i = netlbl_catmap_walk(cmp, 0); i >= 0;
790              i = netlbl_catmap_walk(cmp, i + 1)) {
791                 seq_printf(s, "%c%d", sep, i);
792                 sep = ',';
793         }
794 
795         seq_putc(s, '\n');
796 
797         return 0;
798 }
799 
800 static const struct seq_operations cipso_seq_ops = {
801         .start = cipso_seq_start,
802         .next  = cipso_seq_next,
803         .show  = cipso_seq_show,
804         .stop  = smk_seq_stop,
805 };
806 
807 /**
808  * smk_open_cipso - open() for /smack/cipso
809  * @inode: inode structure representing file
810  * @file: "cipso" file pointer
811  *
812  * Connect our cipso_seq_* operations with /smack/cipso
813  * file_operations
814  */
815 static int smk_open_cipso(struct inode *inode, struct file *file)
816 {
817         return seq_open(file, &cipso_seq_ops);
818 }
819 
820 /**
821  * smk_set_cipso - do the work for write() for cipso and cipso2
822  * @file: file pointer, not actually used
823  * @buf: where to get the data from
824  * @count: bytes sent
825  * @ppos: where to start
826  * @format: /smack/cipso or /smack/cipso2
827  *
828  * Accepts only one cipso rule per write call.
829  * Returns number of bytes written or error code, as appropriate
830  */
831 static ssize_t smk_set_cipso(struct file *file, const char __user *buf,
832                                 size_t count, loff_t *ppos, int format)
833 {
834         struct smack_known *skp;
835         struct netlbl_lsm_secattr ncats;
836         char mapcatset[SMK_CIPSOLEN];
837         int maplevel;
838         unsigned int cat;
839         int catlen;
840         ssize_t rc = -EINVAL;
841         char *data = NULL;
842         char *rule;
843         int ret;
844         int i;
845 
846         /*
847          * Must have privilege.
848          * No partial writes.
849          * Enough data must be present.
850          */
851         if (!smack_privileged(CAP_MAC_ADMIN))
852                 return -EPERM;
853         if (*ppos != 0)
854                 return -EINVAL;
855         if (format == SMK_FIXED24_FMT &&
856             (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX))
857                 return -EINVAL;
858 
859         data = memdup_user_nul(buf, count);
860         if (IS_ERR(data))
861                 return PTR_ERR(data);
862 
863         rule = data;
864         /*
865          * Only allow one writer at a time. Writes should be
866          * quite rare and small in any case.
867          */
868         mutex_lock(&smack_cipso_lock);
869 
870         skp = smk_import_entry(rule, 0);
871         if (IS_ERR(skp)) {
872                 rc = PTR_ERR(skp);
873                 goto out;
874         }
875 
876         if (format == SMK_FIXED24_FMT)
877                 rule += SMK_LABELLEN;
878         else
879                 rule += strlen(skp->smk_known) + 1;
880 
881         ret = sscanf(rule, "%d", &maplevel);
882         if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL)
883                 goto out;
884 
885         rule += SMK_DIGITLEN;
886         ret = sscanf(rule, "%d", &catlen);
887         if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM)
888                 goto out;
889 
890         if (format == SMK_FIXED24_FMT &&
891             count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN))
892                 goto out;
893 
894         memset(mapcatset, 0, sizeof(mapcatset));
895 
896         for (i = 0; i < catlen; i++) {
897                 rule += SMK_DIGITLEN;
898                 ret = sscanf(rule, "%u", &cat);
899                 if (ret != 1 || cat > SMACK_CIPSO_MAXCATNUM)
900                         goto out;
901 
902                 smack_catset_bit(cat, mapcatset);
903         }
904 
905         rc = smk_netlbl_mls(maplevel, mapcatset, &ncats, SMK_CIPSOLEN);
906         if (rc >= 0) {
907                 netlbl_catmap_free(skp->smk_netlabel.attr.mls.cat);
908                 skp->smk_netlabel.attr.mls.cat = ncats.attr.mls.cat;
909                 skp->smk_netlabel.attr.mls.lvl = ncats.attr.mls.lvl;
910                 rc = count;
911         }
912 
913 out:
914         mutex_unlock(&smack_cipso_lock);
915         kfree(data);
916         return rc;
917 }
918 
919 /**
920  * smk_write_cipso - write() for /smack/cipso
921  * @file: file pointer, not actually used
922  * @buf: where to get the data from
923  * @count: bytes sent
924  * @ppos: where to start
925  *
926  * Accepts only one cipso rule per write call.
927  * Returns number of bytes written or error code, as appropriate
928  */
929 static ssize_t smk_write_cipso(struct file *file, const char __user *buf,
930                                size_t count, loff_t *ppos)
931 {
932         return smk_set_cipso(file, buf, count, ppos, SMK_FIXED24_FMT);
933 }
934 
935 static const struct file_operations smk_cipso_ops = {
936         .open           = smk_open_cipso,
937         .read           = seq_read,
938         .llseek         = seq_lseek,
939         .write          = smk_write_cipso,
940         .release        = seq_release,
941 };
942 
943 /*
944  * Seq_file read operations for /smack/cipso2
945  */
946 
947 /*
948  * Print cipso labels in format:
949  * label level[/cat[,cat]]
950  */
951 static int cipso2_seq_show(struct seq_file *s, void *v)
952 {
953         struct list_head  *list = v;
954         struct smack_known *skp =
955                 list_entry_rcu(list, struct smack_known, list);
956         struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
957         char sep = '/';
958         int i;
959 
960         seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
961 
962         for (i = netlbl_catmap_walk(cmp, 0); i >= 0;
963              i = netlbl_catmap_walk(cmp, i + 1)) {
964                 seq_printf(s, "%c%d", sep, i);
965                 sep = ',';
966         }
967 
968         seq_putc(s, '\n');
969 
970         return 0;
971 }
972 
973 static const struct seq_operations cipso2_seq_ops = {
974         .start = cipso_seq_start,
975         .next  = cipso_seq_next,
976         .show  = cipso2_seq_show,
977         .stop  = smk_seq_stop,
978 };
979 
980 /**
981  * smk_open_cipso2 - open() for /smack/cipso2
982  * @inode: inode structure representing file
983  * @file: "cipso2" file pointer
984  *
985  * Connect our cipso_seq_* operations with /smack/cipso2
986  * file_operations
987  */
988 static int smk_open_cipso2(struct inode *inode, struct file *file)
989 {
990         return seq_open(file, &cipso2_seq_ops);
991 }
992 
993 /**
994  * smk_write_cipso2 - write() for /smack/cipso2
995  * @file: file pointer, not actually used
996  * @buf: where to get the data from
997  * @count: bytes sent
998  * @ppos: where to start
999  *
1000  * Accepts only one cipso rule per write call.
1001  * Returns number of bytes written or error code, as appropriate
1002  */
1003 static ssize_t smk_write_cipso2(struct file *file, const char __user *buf,
1004                               size_t count, loff_t *ppos)
1005 {
1006         return smk_set_cipso(file, buf, count, ppos, SMK_LONG_FMT);
1007 }
1008 
1009 static const struct file_operations smk_cipso2_ops = {
1010         .open           = smk_open_cipso2,
1011         .read           = seq_read,
1012         .llseek         = seq_lseek,
1013         .write          = smk_write_cipso2,
1014         .release        = seq_release,
1015 };
1016 
1017 /*
1018  * Seq_file read operations for /smack/netlabel
1019  */
1020 
1021 static void *net4addr_seq_start(struct seq_file *s, loff_t *pos)
1022 {
1023         return smk_seq_start(s, pos, &smk_net4addr_list);
1024 }
1025 
1026 static void *net4addr_seq_next(struct seq_file *s, void *v, loff_t *pos)
1027 {
1028         return smk_seq_next(s, v, pos, &smk_net4addr_list);
1029 }
1030 
1031 /*
1032  * Print host/label pairs
1033  */
1034 static int net4addr_seq_show(struct seq_file *s, void *v)
1035 {
1036         struct list_head *list = v;
1037         struct smk_net4addr *skp =
1038                         list_entry_rcu(list, struct smk_net4addr, list);
1039         char *kp = SMACK_CIPSO_OPTION;
1040 
1041         if (skp->smk_label != NULL)
1042                 kp = skp->smk_label->smk_known;
1043         seq_printf(s, "%pI4/%d %s\n", &skp->smk_host.s_addr,
1044                         skp->smk_masks, kp);
1045 
1046         return 0;
1047 }
1048 
1049 static const struct seq_operations net4addr_seq_ops = {
1050         .start = net4addr_seq_start,
1051         .next  = net4addr_seq_next,
1052         .show  = net4addr_seq_show,
1053         .stop  = smk_seq_stop,
1054 };
1055 
1056 /**
1057  * smk_open_net4addr - open() for /smack/netlabel
1058  * @inode: inode structure representing file
1059  * @file: "netlabel" file pointer
1060  *
1061  * Connect our net4addr_seq_* operations with /smack/netlabel
1062  * file_operations
1063  */
1064 static int smk_open_net4addr(struct inode *inode, struct file *file)
1065 {
1066         return seq_open(file, &net4addr_seq_ops);
1067 }
1068 
1069 /**
1070  * smk_net4addr_insert
1071  * @new : netlabel to insert
1072  *
1073  * This helper insert netlabel in the smack_net4addrs list
1074  * sorted by netmask length (longest to smallest)
1075  * locked by &smk_net4addr_lock in smk_write_net4addr
1076  *
1077  */
1078 static void smk_net4addr_insert(struct smk_net4addr *new)
1079 {
1080         struct smk_net4addr *m;
1081         struct smk_net4addr *m_next;
1082 
1083         if (list_empty(&smk_net4addr_list)) {
1084                 list_add_rcu(&new->list, &smk_net4addr_list);
1085                 return;
1086         }
1087 
1088         m = list_entry_rcu(smk_net4addr_list.next,
1089                            struct smk_net4addr, list);
1090 
1091         /* the comparison '>' is a bit hacky, but works */
1092         if (new->smk_masks > m->smk_masks) {
1093                 list_add_rcu(&new->list, &smk_net4addr_list);
1094                 return;
1095         }
1096 
1097         list_for_each_entry_rcu(m, &smk_net4addr_list, list) {
1098                 if (list_is_last(&m->list, &smk_net4addr_list)) {
1099                         list_add_rcu(&new->list, &m->list);
1100                         return;
1101                 }
1102                 m_next = list_entry_rcu(m->list.next,
1103                                         struct smk_net4addr, list);
1104                 if (new->smk_masks > m_next->smk_masks) {
1105                         list_add_rcu(&new->list, &m->list);
1106                         return;
1107                 }
1108         }
1109 }
1110 
1111 
1112 /**
1113  * smk_write_net4addr - write() for /smack/netlabel
1114  * @file: file pointer, not actually used
1115  * @buf: where to get the data from
1116  * @count: bytes sent
1117  * @ppos: where to start
1118  *
1119  * Accepts only one net4addr per write call.
1120  * Returns number of bytes written or error code, as appropriate
1121  */
1122 static ssize_t smk_write_net4addr(struct file *file, const char __user *buf,
1123                                 size_t count, loff_t *ppos)
1124 {
1125         struct smk_net4addr *snp;
1126         struct sockaddr_in newname;
1127         char *smack;
1128         struct smack_known *skp = NULL;
1129         char *data;
1130         char *host = (char *)&newname.sin_addr.s_addr;
1131         int rc;
1132         struct netlbl_audit audit_info;
1133         struct in_addr mask;
1134         unsigned int m;
1135         unsigned int masks;
1136         int found;
1137         u32 mask_bits = (1<<31);
1138         __be32 nsa;
1139         u32 temp_mask;
1140 
1141         /*
1142          * Must have privilege.
1143          * No partial writes.
1144          * Enough data must be present.
1145          * "<addr/mask, as a.b.c.d/e><space><label>"
1146          * "<addr, as a.b.c.d><space><label>"
1147          */
1148         if (!smack_privileged(CAP_MAC_ADMIN))
1149                 return -EPERM;
1150         if (*ppos != 0)
1151                 return -EINVAL;
1152         if (count < SMK_NETLBLADDRMIN)
1153                 return -EINVAL;
1154 
1155         data = memdup_user_nul(buf, count);
1156         if (IS_ERR(data))
1157                 return PTR_ERR(data);
1158 
1159         smack = kzalloc(count + 1, GFP_KERNEL);
1160         if (smack == NULL) {
1161                 rc = -ENOMEM;
1162                 goto free_data_out;
1163         }
1164 
1165         rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%u %s",
1166                 &host[0], &host[1], &host[2], &host[3], &masks, smack);
1167         if (rc != 6) {
1168                 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s",
1169                         &host[0], &host[1], &host[2], &host[3], smack);
1170                 if (rc != 5) {
1171                         rc = -EINVAL;
1172                         goto free_out;
1173                 }
1174                 m = BEBITS;
1175                 masks = 32;
1176         }
1177         if (masks > BEBITS) {
1178                 rc = -EINVAL;
1179                 goto free_out;
1180         }
1181 
1182         /*
1183          * If smack begins with '-', it is an option, don't import it
1184          */
1185         if (smack[0] != '-') {
1186                 skp = smk_import_entry(smack, 0);
1187                 if (IS_ERR(skp)) {
1188                         rc = PTR_ERR(skp);
1189                         goto free_out;
1190                 }
1191         } else {
1192                 /*
1193                  * Only the -CIPSO option is supported for IPv4
1194                  */
1195                 if (strcmp(smack, SMACK_CIPSO_OPTION) != 0) {
1196                         rc = -EINVAL;
1197                         goto free_out;
1198                 }
1199         }
1200 
1201         for (m = masks, temp_mask = 0; m > 0; m--) {
1202                 temp_mask |= mask_bits;
1203                 mask_bits >>= 1;
1204         }
1205         mask.s_addr = cpu_to_be32(temp_mask);
1206 
1207         newname.sin_addr.s_addr &= mask.s_addr;
1208         /*
1209          * Only allow one writer at a time. Writes should be
1210          * quite rare and small in any case.
1211          */
1212         mutex_lock(&smk_net4addr_lock);
1213 
1214         nsa = newname.sin_addr.s_addr;
1215         /* try to find if the prefix is already in the list */
1216         found = 0;
1217         list_for_each_entry_rcu(snp, &smk_net4addr_list, list) {
1218                 if (snp->smk_host.s_addr == nsa && snp->smk_masks == masks) {
1219                         found = 1;
1220                         break;
1221                 }
1222         }
1223         smk_netlabel_audit_set(&audit_info);
1224 
1225         if (found == 0) {
1226                 snp = kzalloc(sizeof(*snp), GFP_KERNEL);
1227                 if (snp == NULL)
1228                         rc = -ENOMEM;
1229                 else {
1230                         rc = 0;
1231                         snp->smk_host.s_addr = newname.sin_addr.s_addr;
1232                         snp->smk_mask.s_addr = mask.s_addr;
1233                         snp->smk_label = skp;
1234                         snp->smk_masks = masks;
1235                         smk_net4addr_insert(snp);
1236                 }
1237         } else {
1238                 /*
1239                  * Delete the unlabeled entry, only if the previous label
1240                  * wasn't the special CIPSO option
1241                  */
1242                 if (snp->smk_label != NULL)
1243                         rc = netlbl_cfg_unlbl_static_del(&init_net, NULL,
1244                                         &snp->smk_host, &snp->smk_mask,
1245                                         PF_INET, &audit_info);
1246                 else
1247                         rc = 0;
1248                 snp->smk_label = skp;
1249         }
1250 
1251         /*
1252          * Now tell netlabel about the single label nature of
1253          * this host so that incoming packets get labeled.
1254          * but only if we didn't get the special CIPSO option
1255          */
1256         if (rc == 0 && skp != NULL)
1257                 rc = netlbl_cfg_unlbl_static_add(&init_net, NULL,
1258                         &snp->smk_host, &snp->smk_mask, PF_INET,
1259                         snp->smk_label->smk_secid, &audit_info);
1260 
1261         if (rc == 0)
1262                 rc = count;
1263 
1264         mutex_unlock(&smk_net4addr_lock);
1265 
1266 free_out:
1267         kfree(smack);
1268 free_data_out:
1269         kfree(data);
1270 
1271         return rc;
1272 }
1273 
1274 static const struct file_operations smk_net4addr_ops = {
1275         .open           = smk_open_net4addr,
1276         .read           = seq_read,
1277         .llseek         = seq_lseek,
1278         .write          = smk_write_net4addr,
1279         .release        = seq_release,
1280 };
1281 
1282 #if IS_ENABLED(CONFIG_IPV6)
1283 /*
1284  * Seq_file read operations for /smack/netlabel6
1285  */
1286 
1287 static void *net6addr_seq_start(struct seq_file *s, loff_t *pos)
1288 {
1289         return smk_seq_start(s, pos, &smk_net6addr_list);
1290 }
1291 
1292 static void *net6addr_seq_next(struct seq_file *s, void *v, loff_t *pos)
1293 {
1294         return smk_seq_next(s, v, pos, &smk_net6addr_list);
1295 }
1296 
1297 /*
1298  * Print host/label pairs
1299  */
1300 static int net6addr_seq_show(struct seq_file *s, void *v)
1301 {
1302         struct list_head *list = v;
1303         struct smk_net6addr *skp =
1304                          list_entry(list, struct smk_net6addr, list);
1305 
1306         if (skp->smk_label != NULL)
1307                 seq_printf(s, "%pI6/%d %s\n", &skp->smk_host, skp->smk_masks,
1308                                 skp->smk_label->smk_known);
1309 
1310         return 0;
1311 }
1312 
1313 static const struct seq_operations net6addr_seq_ops = {
1314         .start = net6addr_seq_start,
1315         .next  = net6addr_seq_next,
1316         .show  = net6addr_seq_show,
1317         .stop  = smk_seq_stop,
1318 };
1319 
1320 /**
1321  * smk_open_net6addr - open() for /smack/netlabel
1322  * @inode: inode structure representing file
1323  * @file: "netlabel" file pointer
1324  *
1325  * Connect our net6addr_seq_* operations with /smack/netlabel
1326  * file_operations
1327  */
1328 static int smk_open_net6addr(struct inode *inode, struct file *file)
1329 {
1330         return seq_open(file, &net6addr_seq_ops);
1331 }
1332 
1333 /**
1334  * smk_net6addr_insert
1335  * @new : entry to insert
1336  *
1337  * This inserts an entry in the smack_net6addrs list
1338  * sorted by netmask length (longest to smallest)
1339  * locked by &smk_net6addr_lock in smk_write_net6addr
1340  *
1341  */
1342 static void smk_net6addr_insert(struct smk_net6addr *new)
1343 {
1344         struct smk_net6addr *m_next;
1345         struct smk_net6addr *m;
1346 
1347         if (list_empty(&smk_net6addr_list)) {
1348                 list_add_rcu(&new->list, &smk_net6addr_list);
1349                 return;
1350         }
1351 
1352         m = list_entry_rcu(smk_net6addr_list.next,
1353                            struct smk_net6addr, list);
1354 
1355         if (new->smk_masks > m->smk_masks) {
1356                 list_add_rcu(&new->list, &smk_net6addr_list);
1357                 return;
1358         }
1359 
1360         list_for_each_entry_rcu(m, &smk_net6addr_list, list) {
1361                 if (list_is_last(&m->list, &smk_net6addr_list)) {
1362                         list_add_rcu(&new->list, &m->list);
1363                         return;
1364                 }
1365                 m_next = list_entry_rcu(m->list.next,
1366                                         struct smk_net6addr, list);
1367                 if (new->smk_masks > m_next->smk_masks) {
1368                         list_add_rcu(&new->list, &m->list);
1369                         return;
1370                 }
1371         }
1372 }
1373 
1374 
1375 /**
1376  * smk_write_net6addr - write() for /smack/netlabel
1377  * @file: file pointer, not actually used
1378  * @buf: where to get the data from
1379  * @count: bytes sent
1380  * @ppos: where to start
1381  *
1382  * Accepts only one net6addr per write call.
1383  * Returns number of bytes written or error code, as appropriate
1384  */
1385 static ssize_t smk_write_net6addr(struct file *file, const char __user *buf,
1386                                 size_t count, loff_t *ppos)
1387 {
1388         struct smk_net6addr *snp;
1389         struct in6_addr newname;
1390         struct in6_addr fullmask;
1391         struct smack_known *skp = NULL;
1392         char *smack;
1393         char *data;
1394         int rc = 0;
1395         int found = 0;
1396         int i;
1397         unsigned int scanned[8];
1398         unsigned int m;
1399         unsigned int mask = 128;
1400 
1401         /*
1402          * Must have privilege.
1403          * No partial writes.
1404          * Enough data must be present.
1405          * "<addr/mask, as a:b:c:d:e:f:g:h/e><space><label>"
1406          * "<addr, as a:b:c:d:e:f:g:h><space><label>"
1407          */
1408         if (!smack_privileged(CAP_MAC_ADMIN))
1409                 return -EPERM;
1410         if (*ppos != 0)
1411                 return -EINVAL;
1412         if (count < SMK_NETLBLADDRMIN)
1413                 return -EINVAL;
1414 
1415         data = memdup_user_nul(buf, count);
1416         if (IS_ERR(data))
1417                 return PTR_ERR(data);
1418 
1419         smack = kzalloc(count + 1, GFP_KERNEL);
1420         if (smack == NULL) {
1421                 rc = -ENOMEM;
1422                 goto free_data_out;
1423         }
1424 
1425         i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x/%u %s",
1426                         &scanned[0], &scanned[1], &scanned[2], &scanned[3],
1427                         &scanned[4], &scanned[5], &scanned[6], &scanned[7],
1428                         &mask, smack);
1429         if (i != 10) {
1430                 i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x %s",
1431                                 &scanned[0], &scanned[1], &scanned[2],
1432                                 &scanned[3], &scanned[4], &scanned[5],
1433                                 &scanned[6], &scanned[7], smack);
1434                 if (i != 9) {
1435                         rc = -EINVAL;
1436                         goto free_out;
1437                 }
1438         }
1439         if (mask > 128) {
1440                 rc = -EINVAL;
1441                 goto free_out;
1442         }
1443         for (i = 0; i < 8; i++) {
1444                 if (scanned[i] > 0xffff) {
1445                         rc = -EINVAL;
1446                         goto free_out;
1447                 }
1448                 newname.s6_addr16[i] = htons(scanned[i]);
1449         }
1450 
1451         /*
1452          * If smack begins with '-', it is an option, don't import it
1453          */
1454         if (smack[0] != '-') {
1455                 skp = smk_import_entry(smack, 0);
1456                 if (IS_ERR(skp)) {
1457                         rc = PTR_ERR(skp);
1458                         goto free_out;
1459                 }
1460         } else {
1461                 /*
1462                  * Only -DELETE is supported for IPv6
1463                  */
1464                 if (strcmp(smack, SMACK_DELETE_OPTION) != 0) {
1465                         rc = -EINVAL;
1466                         goto free_out;
1467                 }
1468         }
1469 
1470         for (i = 0, m = mask; i < 8; i++) {
1471                 if (m >= 16) {
1472                         fullmask.s6_addr16[i] = 0xffff;
1473                         m -= 16;
1474                 } else if (m > 0) {
1475                         fullmask.s6_addr16[i] = (1 << m) - 1;
1476                         m = 0;
1477                 } else
1478                         fullmask.s6_addr16[i] = 0;
1479                 newname.s6_addr16[i] &= fullmask.s6_addr16[i];
1480         }
1481 
1482         /*
1483          * Only allow one writer at a time. Writes should be
1484          * quite rare and small in any case.
1485          */
1486         mutex_lock(&smk_net6addr_lock);
1487         /*
1488          * Try to find the prefix in the list
1489          */
1490         list_for_each_entry_rcu(snp, &smk_net6addr_list, list) {
1491                 if (mask != snp->smk_masks)
1492                         continue;
1493                 for (found = 1, i = 0; i < 8; i++) {
1494                         if (newname.s6_addr16[i] !=
1495                             snp->smk_host.s6_addr16[i]) {
1496                                 found = 0;
1497                                 break;
1498                         }
1499                 }
1500                 if (found == 1)
1501                         break;
1502         }
1503         if (found == 0) {
1504                 snp = kzalloc(sizeof(*snp), GFP_KERNEL);
1505                 if (snp == NULL)
1506                         rc = -ENOMEM;
1507                 else {
1508                         snp->smk_host = newname;
1509                         snp->smk_mask = fullmask;
1510                         snp->smk_masks = mask;
1511                         snp->smk_label = skp;
1512                         smk_net6addr_insert(snp);
1513                 }
1514         } else {
1515                 snp->smk_label = skp;
1516         }
1517 
1518         if (rc == 0)
1519                 rc = count;
1520 
1521         mutex_unlock(&smk_net6addr_lock);
1522 
1523 free_out:
1524         kfree(smack);
1525 free_data_out:
1526         kfree(data);
1527 
1528         return rc;
1529 }
1530 
1531 static const struct file_operations smk_net6addr_ops = {
1532         .open           = smk_open_net6addr,
1533         .read           = seq_read,
1534         .llseek         = seq_lseek,
1535         .write          = smk_write_net6addr,
1536         .release        = seq_release,
1537 };
1538 #endif /* CONFIG_IPV6 */
1539 
1540 /**
1541  * smk_read_doi - read() for /smack/doi
1542  * @filp: file pointer, not actually used
1543  * @buf: where to put the result
1544  * @count: maximum to send along
1545  * @ppos: where to start
1546  *
1547  * Returns number of bytes read or error code, as appropriate
1548  */
1549 static ssize_t smk_read_doi(struct file *filp, char __user *buf,
1550                             size_t count, loff_t *ppos)
1551 {
1552         char temp[80];
1553         ssize_t rc;
1554 
1555         if (*ppos != 0)
1556                 return 0;
1557 
1558         sprintf(temp, "%d", smk_cipso_doi_value);
1559         rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1560 
1561         return rc;
1562 }
1563 
1564 /**
1565  * smk_write_doi - write() for /smack/doi
1566  * @file: file pointer, not actually used
1567  * @buf: where to get the data from
1568  * @count: bytes sent
1569  * @ppos: where to start
1570  *
1571  * Returns number of bytes written or error code, as appropriate
1572  */
1573 static ssize_t smk_write_doi(struct file *file, const char __user *buf,
1574                              size_t count, loff_t *ppos)
1575 {
1576         char temp[80];
1577         int i;
1578 
1579         if (!smack_privileged(CAP_MAC_ADMIN))
1580                 return -EPERM;
1581 
1582         if (count >= sizeof(temp) || count == 0)
1583                 return -EINVAL;
1584 
1585         if (copy_from_user(temp, buf, count) != 0)
1586                 return -EFAULT;
1587 
1588         temp[count] = '\0';
1589 
1590         if (sscanf(temp, "%d", &i) != 1)
1591                 return -EINVAL;
1592 
1593         smk_cipso_doi_value = i;
1594 
1595         smk_cipso_doi();
1596 
1597         return count;
1598 }
1599 
1600 static const struct file_operations smk_doi_ops = {
1601         .read           = smk_read_doi,
1602         .write          = smk_write_doi,
1603         .llseek         = default_llseek,
1604 };
1605 
1606 /**
1607  * smk_read_direct - read() for /smack/direct
1608  * @filp: file pointer, not actually used
1609  * @buf: where to put the result
1610  * @count: maximum to send along
1611  * @ppos: where to start
1612  *
1613  * Returns number of bytes read or error code, as appropriate
1614  */
1615 static ssize_t smk_read_direct(struct file *filp, char __user *buf,
1616                                size_t count, loff_t *ppos)
1617 {
1618         char temp[80];
1619         ssize_t rc;
1620 
1621         if (*ppos != 0)
1622                 return 0;
1623 
1624         sprintf(temp, "%d", smack_cipso_direct);
1625         rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1626 
1627         return rc;
1628 }
1629 
1630 /**
1631  * smk_write_direct - write() for /smack/direct
1632  * @file: file pointer, not actually used
1633  * @buf: where to get the data from
1634  * @count: bytes sent
1635  * @ppos: where to start
1636  *
1637  * Returns number of bytes written or error code, as appropriate
1638  */
1639 static ssize_t smk_write_direct(struct file *file, const char __user *buf,
1640                                 size_t count, loff_t *ppos)
1641 {
1642         struct smack_known *skp;
1643         char temp[80];
1644         int i;
1645 
1646         if (!smack_privileged(CAP_MAC_ADMIN))
1647                 return -EPERM;
1648 
1649         if (count >= sizeof(temp) || count == 0)
1650                 return -EINVAL;
1651 
1652         if (copy_from_user(temp, buf, count) != 0)
1653                 return -EFAULT;
1654 
1655         temp[count] = '\0';
1656 
1657         if (sscanf(temp, "%d", &i) != 1)
1658                 return -EINVAL;
1659 
1660         /*
1661          * Don't do anything if the value hasn't actually changed.
1662          * If it is changing reset the level on entries that were
1663          * set up to be direct when they were created.
1664          */
1665         if (smack_cipso_direct != i) {
1666                 mutex_lock(&smack_known_lock);
1667                 list_for_each_entry_rcu(skp, &smack_known_list, list)
1668                         if (skp->smk_netlabel.attr.mls.lvl ==
1669                             smack_cipso_direct)
1670                                 skp->smk_netlabel.attr.mls.lvl = i;
1671                 smack_cipso_direct = i;
1672                 mutex_unlock(&smack_known_lock);
1673         }
1674 
1675         return count;
1676 }
1677 
1678 static const struct file_operations smk_direct_ops = {
1679         .read           = smk_read_direct,
1680         .write          = smk_write_direct,
1681         .llseek         = default_llseek,
1682 };
1683 
1684 /**
1685  * smk_read_mapped - read() for /smack/mapped
1686  * @filp: file pointer, not actually used
1687  * @buf: where to put the result
1688  * @count: maximum to send along
1689  * @ppos: where to start
1690  *
1691  * Returns number of bytes read or error code, as appropriate
1692  */
1693 static ssize_t smk_read_mapped(struct file *filp, char __user *buf,
1694                                size_t count, loff_t *ppos)
1695 {
1696         char temp[80];
1697         ssize_t rc;
1698 
1699         if (*ppos != 0)
1700                 return 0;
1701 
1702         sprintf(temp, "%d", smack_cipso_mapped);
1703         rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1704 
1705         return rc;
1706 }
1707 
1708 /**
1709  * smk_write_mapped - write() for /smack/mapped
1710  * @file: file pointer, not actually used
1711  * @buf: where to get the data from
1712  * @count: bytes sent
1713  * @ppos: where to start
1714  *
1715  * Returns number of bytes written or error code, as appropriate
1716  */
1717 static ssize_t smk_write_mapped(struct file *file, const char __user *buf,
1718                                 size_t count, loff_t *ppos)
1719 {
1720         struct smack_known *skp;
1721         char temp[80];
1722         int i;
1723 
1724         if (!smack_privileged(CAP_MAC_ADMIN))
1725                 return -EPERM;
1726 
1727         if (count >= sizeof(temp) || count == 0)
1728                 return -EINVAL;
1729 
1730         if (copy_from_user(temp, buf, count) != 0)
1731                 return -EFAULT;
1732 
1733         temp[count] = '\0';
1734 
1735         if (sscanf(temp, "%d", &i) != 1)
1736                 return -EINVAL;
1737 
1738         /*
1739          * Don't do anything if the value hasn't actually changed.
1740          * If it is changing reset the level on entries that were
1741          * set up to be mapped when they were created.
1742          */
1743         if (smack_cipso_mapped != i) {
1744                 mutex_lock(&smack_known_lock);
1745                 list_for_each_entry_rcu(skp, &smack_known_list, list)
1746                         if (skp->smk_netlabel.attr.mls.lvl ==
1747                             smack_cipso_mapped)
1748                                 skp->smk_netlabel.attr.mls.lvl = i;
1749                 smack_cipso_mapped = i;
1750                 mutex_unlock(&smack_known_lock);
1751         }
1752 
1753         return count;
1754 }
1755 
1756 static const struct file_operations smk_mapped_ops = {
1757         .read           = smk_read_mapped,
1758         .write          = smk_write_mapped,
1759         .llseek         = default_llseek,
1760 };
1761 
1762 /**
1763  * smk_read_ambient - read() for /smack/ambient
1764  * @filp: file pointer, not actually used
1765  * @buf: where to put the result
1766  * @cn: maximum to send along
1767  * @ppos: where to start
1768  *
1769  * Returns number of bytes read or error code, as appropriate
1770  */
1771 static ssize_t smk_read_ambient(struct file *filp, char __user *buf,
1772                                 size_t cn, loff_t *ppos)
1773 {
1774         ssize_t rc;
1775         int asize;
1776 
1777         if (*ppos != 0)
1778                 return 0;
1779         /*
1780          * Being careful to avoid a problem in the case where
1781          * smack_net_ambient gets changed in midstream.
1782          */
1783         mutex_lock(&smack_ambient_lock);
1784 
1785         asize = strlen(smack_net_ambient->smk_known) + 1;
1786 
1787         if (cn >= asize)
1788                 rc = simple_read_from_buffer(buf, cn, ppos,
1789                                              smack_net_ambient->smk_known,
1790                                              asize);
1791         else
1792                 rc = -EINVAL;
1793 
1794         mutex_unlock(&smack_ambient_lock);
1795 
1796         return rc;
1797 }
1798 
1799 /**
1800  * smk_write_ambient - write() for /smack/ambient
1801  * @file: file pointer, not actually used
1802  * @buf: where to get the data from
1803  * @count: bytes sent
1804  * @ppos: where to start
1805  *
1806  * Returns number of bytes written or error code, as appropriate
1807  */
1808 static ssize_t smk_write_ambient(struct file *file, const char __user *buf,
1809                                  size_t count, loff_t *ppos)
1810 {
1811         struct smack_known *skp;
1812         char *oldambient;
1813         char *data;
1814         int rc = count;
1815 
1816         if (!smack_privileged(CAP_MAC_ADMIN))
1817                 return -EPERM;
1818 
1819         data = memdup_user_nul(buf, count);
1820         if (IS_ERR(data))
1821                 return PTR_ERR(data);
1822 
1823         skp = smk_import_entry(data, count);
1824         if (IS_ERR(skp)) {
1825                 rc = PTR_ERR(skp);
1826                 goto out;
1827         }
1828 
1829         mutex_lock(&smack_ambient_lock);
1830 
1831         oldambient = smack_net_ambient->smk_known;
1832         smack_net_ambient = skp;
1833         smk_unlbl_ambient(oldambient);
1834 
1835         mutex_unlock(&smack_ambient_lock);
1836 
1837 out:
1838         kfree(data);
1839         return rc;
1840 }
1841 
1842 static const struct file_operations smk_ambient_ops = {
1843         .read           = smk_read_ambient,
1844         .write          = smk_write_ambient,
1845         .llseek         = default_llseek,
1846 };
1847 
1848 /*
1849  * Seq_file operations for /smack/onlycap
1850  */
1851 static void *onlycap_seq_start(struct seq_file *s, loff_t *pos)
1852 {
1853         return smk_seq_start(s, pos, &smack_onlycap_list);
1854 }
1855 
1856 static void *onlycap_seq_next(struct seq_file *s, void *v, loff_t *pos)
1857 {
1858         return smk_seq_next(s, v, pos, &smack_onlycap_list);
1859 }
1860 
1861 static int onlycap_seq_show(struct seq_file *s, void *v)
1862 {
1863         struct list_head *list = v;
1864         struct smack_known_list_elem *sklep =
1865                 list_entry_rcu(list, struct smack_known_list_elem, list);
1866 
1867         seq_puts(s, sklep->smk_label->smk_known);
1868         seq_putc(s, ' ');
1869 
1870         return 0;
1871 }
1872 
1873 static const struct seq_operations onlycap_seq_ops = {
1874         .start = onlycap_seq_start,
1875         .next  = onlycap_seq_next,
1876         .show  = onlycap_seq_show,
1877         .stop  = smk_seq_stop,
1878 };
1879 
1880 static int smk_open_onlycap(struct inode *inode, struct file *file)
1881 {
1882         return seq_open(file, &onlycap_seq_ops);
1883 }
1884 
1885 /**
1886  * smk_list_swap_rcu - swap public list with a private one in RCU-safe way
1887  * The caller must hold appropriate mutex to prevent concurrent modifications
1888  * to the public list.
1889  * Private list is assumed to be not accessible to other threads yet.
1890  *
1891  * @public: public list
1892  * @private: private list
1893  */
1894 static void smk_list_swap_rcu(struct list_head *public,
1895                               struct list_head *private)
1896 {
1897         struct list_head *first, *last;
1898 
1899         if (list_empty(public)) {
1900                 list_splice_init_rcu(private, public, synchronize_rcu);
1901         } else {
1902                 /* Remember public list before replacing it */
1903                 first = public->next;
1904                 last = public->prev;
1905 
1906                 /* Publish private list in place of public in RCU-safe way */
1907                 private->prev->next = public;
1908                 private->next->prev = public;
1909                 rcu_assign_pointer(public->next, private->next);
1910                 public->prev = private->prev;
1911 
1912                 synchronize_rcu();
1913 
1914                 /* When all readers are done with the old public list,
1915                  * attach it in place of private */
1916                 private->next = first;
1917                 private->prev = last;
1918                 first->prev = private;
1919                 last->next = private;
1920         }
1921 }
1922 
1923 /**
1924  * smk_parse_label_list - parse list of Smack labels, separated by spaces
1925  *
1926  * @data: the string to parse
1927  * @private: destination list
1928  *
1929  * Returns zero on success or error code, as appropriate
1930  */
1931 static int smk_parse_label_list(char *data, struct list_head *list)
1932 {
1933         char *tok;
1934         struct smack_known *skp;
1935         struct smack_known_list_elem *sklep;
1936 
1937         while ((tok = strsep(&data, " ")) != NULL) {
1938                 if (!*tok)
1939                         continue;
1940 
1941                 skp = smk_import_entry(tok, 0);
1942                 if (IS_ERR(skp))
1943                         return PTR_ERR(skp);
1944 
1945                 sklep = kzalloc(sizeof(*sklep), GFP_KERNEL);
1946                 if (sklep == NULL)
1947                         return -ENOMEM;
1948 
1949                 sklep->smk_label = skp;
1950                 list_add(&sklep->list, list);
1951         }
1952 
1953         return 0;
1954 }
1955 
1956 /**
1957  * smk_destroy_label_list - destroy a list of smack_known_list_elem
1958  * @head: header pointer of the list to destroy
1959  */
1960 void smk_destroy_label_list(struct list_head *list)
1961 {
1962         struct smack_known_list_elem *sklep;
1963         struct smack_known_list_elem *sklep2;
1964 
1965         list_for_each_entry_safe(sklep, sklep2, list, list)
1966                 kfree(sklep);
1967 
1968         INIT_LIST_HEAD(list);
1969 }
1970 
1971 /**
1972  * smk_write_onlycap - write() for smackfs/onlycap
1973  * @file: file pointer, not actually used
1974  * @buf: where to get the data from
1975  * @count: bytes sent
1976  * @ppos: where to start
1977  *
1978  * Returns number of bytes written or error code, as appropriate
1979  */
1980 static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
1981                                  size_t count, loff_t *ppos)
1982 {
1983         char *data;
1984         LIST_HEAD(list_tmp);
1985         int rc;
1986 
1987         if (!smack_privileged(CAP_MAC_ADMIN))
1988                 return -EPERM;
1989 
1990         data = memdup_user_nul(buf, count);
1991         if (IS_ERR(data))
1992                 return PTR_ERR(data);
1993 
1994         rc = smk_parse_label_list(data, &list_tmp);
1995         kfree(data);
1996 
1997         /*
1998          * Clear the smack_onlycap on invalid label errors. This means
1999          * that we can pass a null string to unset the onlycap value.
2000          *
2001          * Importing will also reject a label beginning with '-',
2002          * so "-usecapabilities" will also work.
2003          *
2004          * But do so only on invalid label, not on system errors.
2005          * The invalid label must be first to count as clearing attempt.
2006          */
2007         if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) {
2008                 mutex_lock(&smack_onlycap_lock);
2009                 smk_list_swap_rcu(&smack_onlycap_list, &list_tmp);
2010                 mutex_unlock(&smack_onlycap_lock);
2011                 rc = count;
2012         }
2013 
2014         smk_destroy_label_list(&list_tmp);
2015 
2016         return rc;
2017 }
2018 
2019 static const struct file_operations smk_onlycap_ops = {
2020         .open           = smk_open_onlycap,
2021         .read           = seq_read,
2022         .write          = smk_write_onlycap,
2023         .llseek         = seq_lseek,
2024         .release        = seq_release,
2025 };
2026 
2027 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
2028 /**
2029  * smk_read_unconfined - read() for smackfs/unconfined
2030  * @filp: file pointer, not actually used
2031  * @buf: where to put the result
2032  * @cn: maximum to send along
2033  * @ppos: where to start
2034  *
2035  * Returns number of bytes read or error code, as appropriate
2036  */
2037 static ssize_t smk_read_unconfined(struct file *filp, char __user *buf,
2038                                         size_t cn, loff_t *ppos)
2039 {
2040         char *smack = "";
2041         ssize_t rc = -EINVAL;
2042         int asize;
2043 
2044         if (*ppos != 0)
2045                 return 0;
2046 
2047         if (smack_unconfined != NULL)
2048                 smack = smack_unconfined->smk_known;
2049 
2050         asize = strlen(smack) + 1;
2051 
2052         if (cn >= asize)
2053                 rc = simple_read_from_buffer(buf, cn, ppos, smack, asize);
2054 
2055         return rc;
2056 }
2057 
2058 /**
2059  * smk_write_unconfined - write() for smackfs/unconfined
2060  * @file: file pointer, not actually used
2061  * @buf: where to get the data from
2062  * @count: bytes sent
2063  * @ppos: where to start
2064  *
2065  * Returns number of bytes written or error code, as appropriate
2066  */
2067 static ssize_t smk_write_unconfined(struct file *file, const char __user *buf,
2068                                         size_t count, loff_t *ppos)
2069 {
2070         char *data;
2071         struct smack_known *skp;
2072         int rc = count;
2073 
2074         if (!smack_privileged(CAP_MAC_ADMIN))
2075                 return -EPERM;
2076 
2077         data = memdup_user_nul(buf, count);
2078         if (IS_ERR(data))
2079                 return PTR_ERR(data);
2080 
2081         /*
2082          * Clear the smack_unconfined on invalid label errors. This means
2083          * that we can pass a null string to unset the unconfined value.
2084          *
2085          * Importing will also reject a label beginning with '-',
2086          * so "-confine" will also work.
2087          *
2088          * But do so only on invalid label, not on system errors.
2089          */
2090         skp = smk_import_entry(data, count);
2091         if (PTR_ERR(skp) == -EINVAL)
2092                 skp = NULL;
2093         else if (IS_ERR(skp)) {
2094                 rc = PTR_ERR(skp);
2095                 goto freeout;
2096         }
2097 
2098         smack_unconfined = skp;
2099 
2100 freeout:
2101         kfree(data);
2102         return rc;
2103 }
2104 
2105 static const struct file_operations smk_unconfined_ops = {
2106         .read           = smk_read_unconfined,
2107         .write          = smk_write_unconfined,
2108         .llseek         = default_llseek,
2109 };
2110 #endif /* CONFIG_SECURITY_SMACK_BRINGUP */
2111 
2112 /**
2113  * smk_read_logging - read() for /smack/logging
2114  * @filp: file pointer, not actually used
2115  * @buf: where to put the result
2116  * @cn: maximum to send along
2117  * @ppos: where to start
2118  *
2119  * Returns number of bytes read or error code, as appropriate
2120  */
2121 static ssize_t smk_read_logging(struct file *filp, char __user *buf,
2122                                 size_t count, loff_t *ppos)
2123 {
2124         char temp[32];
2125         ssize_t rc;
2126 
2127         if (*ppos != 0)
2128                 return 0;
2129 
2130         sprintf(temp, "%d\n", log_policy);
2131         rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
2132         return rc;
2133 }
2134 
2135 /**
2136  * smk_write_logging - write() for /smack/logging
2137  * @file: file pointer, not actually used
2138  * @buf: where to get the data from
2139  * @count: bytes sent
2140  * @ppos: where to start
2141  *
2142  * Returns number of bytes written or error code, as appropriate
2143  */
2144 static ssize_t smk_write_logging(struct file *file, const char __user *buf,
2145                                 size_t count, loff_t *ppos)
2146 {
2147         char temp[32];
2148         int i;
2149 
2150         if (!smack_privileged(CAP_MAC_ADMIN))
2151                 return -EPERM;
2152 
2153         if (count >= sizeof(temp) || count == 0)
2154                 return -EINVAL;
2155 
2156         if (copy_from_user(temp, buf, count) != 0)
2157                 return -EFAULT;
2158 
2159         temp[count] = '\0';
2160 
2161         if (sscanf(temp, "%d", &i) != 1)
2162                 return -EINVAL;
2163         if (i < 0 || i > 3)
2164                 return -EINVAL;
2165         log_policy = i;
2166         return count;
2167 }
2168 
2169 
2170 
2171 static const struct file_operations smk_logging_ops = {
2172         .read           = smk_read_logging,
2173         .write          = smk_write_logging,
2174         .llseek         = default_llseek,
2175 };
2176 
2177 /*
2178  * Seq_file read operations for /smack/load-self
2179  */
2180 
2181 static void *load_self_seq_start(struct seq_file *s, loff_t *pos)
2182 {
2183         struct task_smack *tsp = smack_cred(current_cred());
2184 
2185         return smk_seq_start(s, pos, &tsp->smk_rules);
2186 }
2187 
2188 static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
2189 {
2190         struct task_smack *tsp = smack_cred(current_cred());
2191 
2192         return smk_seq_next(s, v, pos, &tsp->smk_rules);
2193 }
2194 
2195 static int load_self_seq_show(struct seq_file *s, void *v)
2196 {
2197         struct list_head *list = v;
2198         struct smack_rule *srp =
2199                 list_entry_rcu(list, struct smack_rule, list);
2200 
2201         smk_rule_show(s, srp, SMK_LABELLEN);
2202 
2203         return 0;
2204 }
2205 
2206 static const struct seq_operations load_self_seq_ops = {
2207         .start = load_self_seq_start,
2208         .next  = load_self_seq_next,
2209         .show  = load_self_seq_show,
2210         .stop  = smk_seq_stop,
2211 };
2212 
2213 
2214 /**
2215  * smk_open_load_self - open() for /smack/load-self2
2216  * @inode: inode structure representing file
2217  * @file: "load" file pointer
2218  *
2219  * For reading, use load_seq_* seq_file reading operations.
2220  */
2221 static int smk_open_load_self(struct inode *inode, struct file *file)
2222 {
2223         return seq_open(file, &load_self_seq_ops);
2224 }
2225 
2226 /**
2227  * smk_write_load_self - write() for /smack/load-self
2228  * @file: file pointer, not actually used
2229  * @buf: where to get the data from
2230  * @count: bytes sent
2231  * @ppos: where to start - must be 0
2232  *
2233  */
2234 static ssize_t smk_write_load_self(struct file *file, const char __user *buf,
2235                               size_t count, loff_t *ppos)
2236 {
2237         struct task_smack *tsp = smack_cred(current_cred());
2238 
2239         return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
2240                                     &tsp->smk_rules_lock, SMK_FIXED24_FMT);
2241 }
2242 
2243 static const struct file_operations smk_load_self_ops = {
2244         .open           = smk_open_load_self,
2245         .read           = seq_read,
2246         .llseek         = seq_lseek,
2247         .write          = smk_write_load_self,
2248         .release        = seq_release,
2249 };
2250 
2251 /**
2252  * smk_user_access - handle access check transaction
2253  * @file: file pointer
2254  * @buf: data from user space
2255  * @count: bytes sent
2256  * @ppos: where to start - must be 0
2257  */
2258 static ssize_t smk_user_access(struct file *file, const char __user *buf,
2259                                 size_t count, loff_t *ppos, int format)
2260 {
2261         struct smack_parsed_rule rule;
2262         char *data;
2263         int res;
2264 
2265         data = simple_transaction_get(file, buf, count);
2266         if (IS_ERR(data))
2267                 return PTR_ERR(data);
2268 
2269         if (format == SMK_FIXED24_FMT) {
2270                 if (count < SMK_LOADLEN)
2271                         return -EINVAL;
2272                 res = smk_parse_rule(data, &rule, 0);
2273         } else {
2274                 /*
2275                  * simple_transaction_get() returns null-terminated data
2276                  */
2277                 res = smk_parse_long_rule(data, &rule, 0, 3);
2278         }
2279 
2280         if (res >= 0)
2281                 res = smk_access(rule.smk_subject, rule.smk_object,
2282                                  rule.smk_access1, NULL);
2283         else if (res != -ENOENT)
2284                 return res;
2285 
2286         /*
2287          * smk_access() can return a value > 0 in the "bringup" case.
2288          */
2289         data[0] = res >= 0 ? '1' : '';
2290         data[1] = '\0';
2291 
2292         simple_transaction_set(file, 2);
2293 
2294         if (format == SMK_FIXED24_FMT)
2295                 return SMK_LOADLEN;
2296         return count;
2297 }
2298 
2299 /**
2300  * smk_write_access - handle access check transaction
2301  * @file: file pointer
2302  * @buf: data from user space
2303  * @count: bytes sent
2304  * @ppos: where to start - must be 0
2305  */
2306 static ssize_t smk_write_access(struct file *file, const char __user *buf,
2307                                 size_t count, loff_t *ppos)
2308 {
2309         return smk_user_access(file, buf, count, ppos, SMK_FIXED24_FMT);
2310 }
2311 
2312 static const struct file_operations smk_access_ops = {
2313         .write          = smk_write_access,
2314         .read           = simple_transaction_read,
2315         .release        = simple_transaction_release,
2316         .llseek         = generic_file_llseek,
2317 };
2318 
2319 
2320 /*
2321  * Seq_file read operations for /smack/load2
2322  */
2323 
2324 static int load2_seq_show(struct seq_file *s, void *v)
2325 {
2326         struct list_head *list = v;
2327         struct smack_rule *srp;
2328         struct smack_known *skp =
2329                 list_entry_rcu(list, struct smack_known, list);
2330 
2331         list_for_each_entry_rcu(srp, &skp->smk_rules, list)
2332                 smk_rule_show(s, srp, SMK_LONGLABEL);
2333 
2334         return 0;
2335 }
2336 
2337 static const struct seq_operations load2_seq_ops = {
2338         .start = load2_seq_start,
2339         .next  = load2_seq_next,
2340         .show  = load2_seq_show,
2341         .stop  = smk_seq_stop,
2342 };
2343 
2344 /**
2345  * smk_open_load2 - open() for /smack/load2
2346  * @inode: inode structure representing file
2347  * @file: "load2" file pointer
2348  *
2349  * For reading, use load2_seq_* seq_file reading operations.
2350  */
2351 static int smk_open_load2(struct inode *inode, struct file *file)
2352 {
2353         return seq_open(file, &load2_seq_ops);
2354 }
2355 
2356 /**
2357  * smk_write_load2 - write() for /smack/load2
2358  * @file: file pointer, not actually used
2359  * @buf: where to get the data from
2360  * @count: bytes sent
2361  * @ppos: where to start - must be 0
2362  *
2363  */
2364 static ssize_t smk_write_load2(struct file *file, const char __user *buf,
2365                                 size_t count, loff_t *ppos)
2366 {
2367         /*
2368          * Must have privilege.
2369          */
2370         if (!smack_privileged(CAP_MAC_ADMIN))
2371                 return -EPERM;
2372 
2373         return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
2374                                     SMK_LONG_FMT);
2375 }
2376 
2377 static const struct file_operations smk_load2_ops = {
2378         .open           = smk_open_load2,
2379         .read           = seq_read,
2380         .llseek         = seq_lseek,
2381         .write          = smk_write_load2,
2382         .release        = seq_release,
2383 };
2384 
2385 /*
2386  * Seq_file read operations for /smack/load-self2
2387  */
2388 
2389 static void *load_self2_seq_start(struct seq_file *s, loff_t *pos)
2390 {
2391         struct task_smack *tsp = smack_cred(current_cred());
2392 
2393         return smk_seq_start(s, pos, &tsp->smk_rules);
2394 }
2395 
2396 static void *load_self2_seq_next(struct seq_file *s, void *v, loff_t *pos)
2397 {
2398         struct task_smack *tsp = smack_cred(current_cred());
2399 
2400         return smk_seq_next(s, v, pos, &tsp->smk_rules);
2401 }
2402 
2403 static int load_self2_seq_show(struct seq_file *s, void *v)
2404 {
2405         struct list_head *list = v;
2406         struct smack_rule *srp =
2407                 list_entry_rcu(list, struct smack_rule, list);
2408 
2409         smk_rule_show(s, srp, SMK_LONGLABEL);
2410 
2411         return 0;
2412 }
2413 
2414 static const struct seq_operations load_self2_seq_ops = {
2415         .start = load_self2_seq_start,
2416         .next  = load_self2_seq_next,
2417         .show  = load_self2_seq_show,
2418         .stop  = smk_seq_stop,
2419 };
2420 
2421 /**
2422  * smk_open_load_self2 - open() for /smack/load-self2
2423  * @inode: inode structure representing file
2424  * @file: "load" file pointer
2425  *
2426  * For reading, use load_seq_* seq_file reading operations.
2427  */
2428 static int smk_open_load_self2(struct inode *inode, struct file *file)
2429 {
2430         return seq_open(file, &load_self2_seq_ops);
2431 }
2432 
2433 /**
2434  * smk_write_load_self2 - write() for /smack/load-self2
2435  * @file: file pointer, not actually used
2436  * @buf: where to get the data from
2437  * @count: bytes sent
2438  * @ppos: where to start - must be 0
2439  *
2440  */
2441 static ssize_t smk_write_load_self2(struct file *file, const char __user *buf,
2442                               size_t count, loff_t *ppos)
2443 {
2444         struct task_smack *tsp = smack_cred(current_cred());
2445 
2446         return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
2447                                     &tsp->smk_rules_lock, SMK_LONG_FMT);
2448 }
2449 
2450 static const struct file_operations smk_load_self2_ops = {
2451         .open           = smk_open_load_self2,
2452         .read           = seq_read,
2453         .llseek         = seq_lseek,
2454         .write          = smk_write_load_self2,
2455         .release        = seq_release,
2456 };
2457 
2458 /**
2459  * smk_write_access2 - handle access check transaction
2460  * @file: file pointer
2461  * @buf: data from user space
2462  * @count: bytes sent
2463  * @ppos: where to start - must be 0
2464  */
2465 static ssize_t smk_write_access2(struct file *file, const char __user *buf,
2466                                         size_t count, loff_t *ppos)
2467 {
2468         return smk_user_access(file, buf, count, ppos, SMK_LONG_FMT);
2469 }
2470 
2471 static const struct file_operations smk_access2_ops = {
2472         .write          = smk_write_access2,
2473         .read           = simple_transaction_read,
2474         .release        = simple_transaction_release,
2475         .llseek         = generic_file_llseek,
2476 };
2477 
2478 /**
2479  * smk_write_revoke_subj - write() for /smack/revoke-subject
2480  * @file: file pointer
2481  * @buf: data from user space
2482  * @count: bytes sent
2483  * @ppos: where to start - must be 0
2484  */
2485 static ssize_t smk_write_revoke_subj(struct file *file, const char __user *buf,
2486                                 size_t count, loff_t *ppos)
2487 {
2488         char *data;
2489         const char *cp;
2490         struct smack_known *skp;
2491         struct smack_rule *sp;
2492         struct list_head *rule_list;
2493         struct mutex *rule_lock;
2494         int rc = count;
2495 
2496         if (*ppos != 0)
2497                 return -EINVAL;
2498 
2499         if (!smack_privileged(CAP_MAC_ADMIN))
2500                 return -EPERM;
2501 
2502         if (count == 0 || count > SMK_LONGLABEL)
2503                 return -EINVAL;
2504 
2505         data = memdup_user(buf, count);
2506         if (IS_ERR(data))
2507                 return PTR_ERR(data);
2508 
2509         cp = smk_parse_smack(data, count);
2510         if (IS_ERR(cp)) {
2511                 rc = PTR_ERR(cp);
2512                 goto out_data;
2513         }
2514 
2515         skp = smk_find_entry(cp);
2516         if (skp == NULL)
2517                 goto out_cp;
2518 
2519         rule_list = &skp->smk_rules;
2520         rule_lock = &skp->smk_rules_lock;
2521 
2522         mutex_lock(rule_lock);
2523 
2524         list_for_each_entry_rcu(sp, rule_list, list)
2525                 sp->smk_access = 0;
2526 
2527         mutex_unlock(rule_lock);
2528 
2529 out_cp:
2530         kfree(cp);
2531 out_data:
2532         kfree(data);
2533 
2534         return rc;
2535 }
2536 
2537 static const struct file_operations smk_revoke_subj_ops = {
2538         .write          = smk_write_revoke_subj,
2539         .read           = simple_transaction_read,
2540         .release        = simple_transaction_release,
2541         .llseek         = generic_file_llseek,
2542 };
2543 
2544 /**
2545  * smk_init_sysfs - initialize /sys/fs/smackfs
2546  *
2547  */
2548 static int smk_init_sysfs(void)
2549 {
2550         return sysfs_create_mount_point(fs_kobj, "smackfs");
2551 }
2552 
2553 /**
2554  * smk_write_change_rule - write() for /smack/change-rule
2555  * @file: file pointer
2556  * @buf: data from user space
2557  * @count: bytes sent
2558  * @ppos: where to start - must be 0
2559  */
2560 static ssize_t smk_write_change_rule(struct file *file, const char __user *buf,
2561                                 size_t count, loff_t *ppos)
2562 {
2563         /*
2564          * Must have privilege.
2565          */
2566         if (!smack_privileged(CAP_MAC_ADMIN))
2567                 return -EPERM;
2568 
2569         return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
2570                                     SMK_CHANGE_FMT);
2571 }
2572 
2573 static const struct file_operations smk_change_rule_ops = {
2574         .write          = smk_write_change_rule,
2575         .read           = simple_transaction_read,
2576         .release        = simple_transaction_release,
2577         .llseek         = generic_file_llseek,
2578 };
2579 
2580 /**
2581  * smk_read_syslog - read() for smackfs/syslog
2582  * @filp: file pointer, not actually used
2583  * @buf: where to put the result
2584  * @cn: maximum to send along
2585  * @ppos: where to start
2586  *
2587  * Returns number of bytes read or error code, as appropriate
2588  */
2589 static ssize_t smk_read_syslog(struct file *filp, char __user *buf,
2590                                 size_t cn, loff_t *ppos)
2591 {
2592         struct smack_known *skp;
2593         ssize_t rc = -EINVAL;
2594         int asize;
2595 
2596         if (*ppos != 0)
2597                 return 0;
2598 
2599         if (smack_syslog_label == NULL)
2600                 skp = &smack_known_star;
2601         else
2602                 skp = smack_syslog_label;
2603 
2604         asize = strlen(skp->smk_known) + 1;
2605 
2606         if (cn >= asize)
2607                 rc = simple_read_from_buffer(buf, cn, ppos, skp->smk_known,
2608                                                 asize);
2609 
2610         return rc;
2611 }
2612 
2613 /**
2614  * smk_write_syslog - write() for smackfs/syslog
2615  * @file: file pointer, not actually used
2616  * @buf: where to get the data from
2617  * @count: bytes sent
2618  * @ppos: where to start
2619  *
2620  * Returns number of bytes written or error code, as appropriate
2621  */
2622 static ssize_t smk_write_syslog(struct file *file, const char __user *buf,
2623                                 size_t count, loff_t *ppos)
2624 {
2625         char *data;
2626         struct smack_known *skp;
2627         int rc = count;
2628 
2629         if (!smack_privileged(CAP_MAC_ADMIN))
2630                 return -EPERM;
2631 
2632         data = memdup_user_nul(buf, count);
2633         if (IS_ERR(data))
2634                 return PTR_ERR(data);
2635 
2636         skp = smk_import_entry(data, count);
2637         if (IS_ERR(skp))
2638                 rc = PTR_ERR(skp);
2639         else
2640                 smack_syslog_label = skp;
2641 
2642         kfree(data);
2643         return rc;
2644 }
2645 
2646 static const struct file_operations smk_syslog_ops = {
2647         .read           = smk_read_syslog,
2648         .write          = smk_write_syslog,
2649         .llseek         = default_llseek,
2650 };
2651 
2652 /*
2653  * Seq_file read operations for /smack/relabel-self
2654  */
2655 
2656 static void *relabel_self_seq_start(struct seq_file *s, loff_t *pos)
2657 {
2658         struct task_smack *tsp = smack_cred(current_cred());
2659 
2660         return smk_seq_start(s, pos, &tsp->smk_relabel);
2661 }
2662 
2663 static void *relabel_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
2664 {
2665         struct task_smack *tsp = smack_cred(current_cred());
2666 
2667         return smk_seq_next(s, v, pos, &tsp->smk_relabel);
2668 }
2669 
2670 static int relabel_self_seq_show(struct seq_file *s, void *v)
2671 {
2672         struct list_head *list = v;
2673         struct smack_known_list_elem *sklep =
2674                 list_entry(list, struct smack_known_list_elem, list);
2675 
2676         seq_puts(s, sklep->smk_label->smk_known);
2677         seq_putc(s, ' ');
2678 
2679         return 0;
2680 }
2681 
2682 static const struct seq_operations relabel_self_seq_ops = {
2683         .start = relabel_self_seq_start,
2684         .next  = relabel_self_seq_next,
2685         .show  = relabel_self_seq_show,
2686         .stop  = smk_seq_stop,
2687 };
2688 
2689 /**
2690  * smk_open_relabel_self - open() for /smack/relabel-self
2691  * @inode: inode structure representing file
2692  * @file: "relabel-self" file pointer
2693  *
2694  * Connect our relabel_self_seq_* operations with /smack/relabel-self
2695  * file_operations
2696  */
2697 static int smk_open_relabel_self(struct inode *inode, struct file *file)
2698 {
2699         return seq_open(file, &relabel_self_seq_ops);
2700 }
2701 
2702 /**
2703  * smk_write_relabel_self - write() for /smack/relabel-self
2704  * @file: file pointer, not actually used
2705  * @buf: where to get the data from
2706  * @count: bytes sent
2707  * @ppos: where to start - must be 0
2708  *
2709  */
2710 static ssize_t smk_write_relabel_self(struct file *file, const char __user *buf,
2711                                 size_t count, loff_t *ppos)
2712 {
2713         struct task_smack *tsp = smack_cred(current_cred());
2714         char *data;
2715         int rc;
2716         LIST_HEAD(list_tmp);
2717 
2718         /*
2719          * Must have privilege.
2720          */
2721         if (!smack_privileged(CAP_MAC_ADMIN))
2722                 return -EPERM;
2723 
2724         /*
2725          * Enough data must be present.
2726          */
2727         if (*ppos != 0)
2728                 return -EINVAL;
2729 
2730         data = memdup_user_nul(buf, count);
2731         if (IS_ERR(data))
2732                 return PTR_ERR(data);
2733 
2734         rc = smk_parse_label_list(data, &list_tmp);
2735         kfree(data);
2736 
2737         if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) {
2738                 smk_destroy_label_list(&tsp->smk_relabel);
2739                 list_splice(&list_tmp, &tsp->smk_relabel);
2740                 return count;
2741         }
2742 
2743         smk_destroy_label_list(&list_tmp);
2744         return rc;
2745 }
2746 
2747 static const struct file_operations smk_relabel_self_ops = {
2748         .open           = smk_open_relabel_self,
2749         .read           = seq_read,
2750         .llseek         = seq_lseek,
2751         .write          = smk_write_relabel_self,
2752         .release        = seq_release,
2753 };
2754 
2755 /**
2756  * smk_read_ptrace - read() for /smack/ptrace
2757  * @filp: file pointer, not actually used
2758  * @buf: where to put the result
2759  * @count: maximum to send along
2760  * @ppos: where to start
2761  *
2762  * Returns number of bytes read or error code, as appropriate
2763  */
2764 static ssize_t smk_read_ptrace(struct file *filp, char __user *buf,
2765                                size_t count, loff_t *ppos)
2766 {
2767         char temp[32];
2768         ssize_t rc;
2769 
2770         if (*ppos != 0)
2771                 return 0;
2772 
2773         sprintf(temp, "%d\n", smack_ptrace_rule);
2774         rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
2775         return rc;
2776 }
2777 
2778 /**
2779  * smk_write_ptrace - write() for /smack/ptrace
2780  * @file: file pointer
2781  * @buf: data from user space
2782  * @count: bytes sent
2783  * @ppos: where to start - must be 0
2784  */
2785 static ssize_t smk_write_ptrace(struct file *file, const char __user *buf,
2786                                 size_t count, loff_t *ppos)
2787 {
2788         char temp[32];
2789         int i;
2790 
2791         if (!smack_privileged(CAP_MAC_ADMIN))
2792                 return -EPERM;
2793 
2794         if (*ppos != 0 || count >= sizeof(temp) || count == 0)
2795                 return -EINVAL;
2796 
2797         if (copy_from_user(temp, buf, count) != 0)
2798                 return -EFAULT;
2799 
2800         temp[count] = '\0';
2801 
2802         if (sscanf(temp, "%d", &i) != 1)
2803                 return -EINVAL;
2804         if (i < SMACK_PTRACE_DEFAULT || i > SMACK_PTRACE_MAX)
2805                 return -EINVAL;
2806         smack_ptrace_rule = i;
2807 
2808         return count;
2809 }
2810 
2811 static const struct file_operations smk_ptrace_ops = {
2812         .write          = smk_write_ptrace,
2813         .read           = smk_read_ptrace,
2814         .llseek         = default_llseek,
2815 };
2816 
2817 /**
2818  * smk_fill_super - fill the smackfs superblock
2819  * @sb: the empty superblock
2820  * @fc: unused
2821  *
2822  * Fill in the well known entries for the smack filesystem
2823  *
2824  * Returns 0 on success, an error code on failure
2825  */
2826 static int smk_fill_super(struct super_block *sb, struct fs_context *fc)
2827 {
2828         int rc;
2829 
2830         static const struct tree_descr smack_files[] = {
2831                 [SMK_LOAD] = {
2832                         "load", &smk_load_ops, S_IRUGO|S_IWUSR},
2833                 [SMK_CIPSO] = {
2834                         "cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR},
2835                 [SMK_DOI] = {
2836                         "doi", &smk_doi_ops, S_IRUGO|S_IWUSR},
2837                 [SMK_DIRECT] = {
2838                         "direct", &smk_direct_ops, S_IRUGO|S_IWUSR},
2839                 [SMK_AMBIENT] = {
2840                         "ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR},
2841                 [SMK_NET4ADDR] = {
2842                         "netlabel", &smk_net4addr_ops, S_IRUGO|S_IWUSR},
2843                 [SMK_ONLYCAP] = {
2844                         "onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR},
2845                 [SMK_LOGGING] = {
2846                         "logging", &smk_logging_ops, S_IRUGO|S_IWUSR},
2847                 [SMK_LOAD_SELF] = {
2848                         "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO},
2849                 [SMK_ACCESSES] = {
2850                         "access", &smk_access_ops, S_IRUGO|S_IWUGO},
2851                 [SMK_MAPPED] = {
2852                         "mapped", &smk_mapped_ops, S_IRUGO|S_IWUSR},
2853                 [SMK_LOAD2] = {
2854                         "load2", &smk_load2_ops, S_IRUGO|S_IWUSR},
2855                 [SMK_LOAD_SELF2] = {
2856                         "load-self2", &smk_load_self2_ops, S_IRUGO|S_IWUGO},
2857                 [SMK_ACCESS2] = {
2858                         "access2", &smk_access2_ops, S_IRUGO|S_IWUGO},
2859                 [SMK_CIPSO2] = {
2860                         "cipso2", &smk_cipso2_ops, S_IRUGO|S_IWUSR},
2861                 [SMK_REVOKE_SUBJ] = {
2862                         "revoke-subject", &smk_revoke_subj_ops,
2863                         S_IRUGO|S_IWUSR},
2864                 [SMK_CHANGE_RULE] = {
2865                         "change-rule", &smk_change_rule_ops, S_IRUGO|S_IWUSR},
2866                 [SMK_SYSLOG] = {
2867                         "syslog", &smk_syslog_ops, S_IRUGO|S_IWUSR},
2868                 [SMK_PTRACE] = {
2869                         "ptrace", &smk_ptrace_ops, S_IRUGO|S_IWUSR},
2870 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
2871                 [SMK_UNCONFINED] = {
2872                         "unconfined", &smk_unconfined_ops, S_IRUGO|S_IWUSR},
2873 #endif
2874 #if IS_ENABLED(CONFIG_IPV6)
2875                 [SMK_NET6ADDR] = {
2876                         "ipv6host", &smk_net6addr_ops, S_IRUGO|S_IWUSR},
2877 #endif /* CONFIG_IPV6 */
2878                 [SMK_RELABEL_SELF] = {
2879                         "relabel-self", &smk_relabel_self_ops,
2880                                 S_IRUGO|S_IWUGO},
2881                 /* last one */
2882                         {""}
2883         };
2884 
2885         rc = simple_fill_super(sb, SMACK_MAGIC, smack_files);
2886         if (rc != 0) {
2887                 printk(KERN_ERR "%s failed %d while creating inodes\n",
2888                         __func__, rc);
2889                 return rc;
2890         }
2891 
2892         return 0;
2893 }
2894 
2895 /**
2896  * smk_get_tree - get the smackfs superblock
2897  * @fc: The mount context, including any options
2898  *
2899  * Just passes everything along.
2900  *
2901  * Returns what the lower level code does.
2902  */
2903 static int smk_get_tree(struct fs_context *fc)
2904 {
2905         return get_tree_single(fc, smk_fill_super);
2906 }
2907 
2908 static const struct fs_context_operations smk_context_ops = {
2909         .get_tree       = smk_get_tree,
2910 };
2911 
2912 /**
2913  * smk_init_fs_context - Initialise a filesystem context for smackfs
2914  * @fc: The blank mount context
2915  */
2916 static int smk_init_fs_context(struct fs_context *fc)
2917 {
2918         fc->ops = &smk_context_ops;
2919         return 0;
2920 }
2921 
2922 static struct file_system_type smk_fs_type = {
2923         .name           = "smackfs",
2924         .init_fs_context = smk_init_fs_context,
2925         .kill_sb        = kill_litter_super,
2926 };
2927 
2928 static struct vfsmount *smackfs_mount;
2929 
2930 static int __init smk_preset_netlabel(struct smack_known *skp)
2931 {
2932         skp->smk_netlabel.domain = skp->smk_known;
2933         skp->smk_netlabel.flags =
2934                 NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL;
2935         return smk_netlbl_mls(smack_cipso_direct, skp->smk_known,
2936                                 &skp->smk_netlabel, strlen(skp->smk_known));
2937 }
2938 
2939 /**
2940  * init_smk_fs - get the smackfs superblock
2941  *
2942  * register the smackfs
2943  *
2944  * Do not register smackfs if Smack wasn't enabled
2945  * on boot. We can not put this method normally under the
2946  * smack_init() code path since the security subsystem get
2947  * initialized before the vfs caches.
2948  *
2949  * Returns true if we were not chosen on boot or if
2950  * we were chosen and filesystem registration succeeded.
2951  */
2952 static int __init init_smk_fs(void)
2953 {
2954         int err;
2955         int rc;
2956 
2957         if (smack_enabled == 0)
2958                 return 0;
2959 
2960         err = smk_init_sysfs();
2961         if (err)
2962                 printk(KERN_ERR "smackfs: sysfs mountpoint problem.\n");
2963 
2964         err = register_filesystem(&smk_fs_type);
2965         if (!err) {
2966                 smackfs_mount = kern_mount(&smk_fs_type);
2967                 if (IS_ERR(smackfs_mount)) {
2968                         printk(KERN_ERR "smackfs:  could not mount!\n");
2969                         err = PTR_ERR(smackfs_mount);
2970                         smackfs_mount = NULL;
2971                 }
2972         }
2973 
2974         smk_cipso_doi();
2975         smk_unlbl_ambient(NULL);
2976 
2977         rc = smk_preset_netlabel(&smack_known_floor);
2978         if (err == 0 && rc < 0)
2979                 err = rc;
2980         rc = smk_preset_netlabel(&smack_known_hat);
2981         if (err == 0 && rc < 0)
2982                 err = rc;
2983         rc = smk_preset_netlabel(&smack_known_huh);
2984         if (err == 0 && rc < 0)
2985                 err = rc;
2986         rc = smk_preset_netlabel(&smack_known_star);
2987         if (err == 0 && rc < 0)
2988                 err = rc;
2989         rc = smk_preset_netlabel(&smack_known_web);
2990         if (err == 0 && rc < 0)
2991                 err = rc;
2992 
2993         return err;
2994 }
2995 
2996 __initcall(init_smk_fs);
2997 

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