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TOMOYO Linux Cross Reference
Linux/security/apparmor/apparmorfs.c

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  1 /*
  2  * AppArmor security module
  3  *
  4  * This file contains AppArmor /sys/kernel/security/apparmor interface functions
  5  *
  6  * Copyright (C) 1998-2008 Novell/SUSE
  7  * Copyright 2009-2010 Canonical Ltd.
  8  *
  9  * This program is free software; you can redistribute it and/or
 10  * modify it under the terms of the GNU General Public License as
 11  * published by the Free Software Foundation, version 2 of the
 12  * License.
 13  */
 14 
 15 #include <linux/ctype.h>
 16 #include <linux/security.h>
 17 #include <linux/vmalloc.h>
 18 #include <linux/module.h>
 19 #include <linux/seq_file.h>
 20 #include <linux/uaccess.h>
 21 #include <linux/namei.h>
 22 #include <linux/capability.h>
 23 #include <linux/rcupdate.h>
 24 
 25 #include "include/apparmor.h"
 26 #include "include/apparmorfs.h"
 27 #include "include/audit.h"
 28 #include "include/context.h"
 29 #include "include/crypto.h"
 30 #include "include/policy.h"
 31 #include "include/resource.h"
 32 
 33 /**
 34  * aa_mangle_name - mangle a profile name to std profile layout form
 35  * @name: profile name to mangle  (NOT NULL)
 36  * @target: buffer to store mangled name, same length as @name (MAYBE NULL)
 37  *
 38  * Returns: length of mangled name
 39  */
 40 static int mangle_name(char *name, char *target)
 41 {
 42         char *t = target;
 43 
 44         while (*name == '/' || *name == '.')
 45                 name++;
 46 
 47         if (target) {
 48                 for (; *name; name++) {
 49                         if (*name == '/')
 50                                 *(t)++ = '.';
 51                         else if (isspace(*name))
 52                                 *(t)++ = '_';
 53                         else if (isalnum(*name) || strchr("._-", *name))
 54                                 *(t)++ = *name;
 55                 }
 56 
 57                 *t = 0;
 58         } else {
 59                 int len = 0;
 60                 for (; *name; name++) {
 61                         if (isalnum(*name) || isspace(*name) ||
 62                             strchr("/._-", *name))
 63                                 len++;
 64                 }
 65 
 66                 return len;
 67         }
 68 
 69         return t - target;
 70 }
 71 
 72 /**
 73  * aa_simple_write_to_buffer - common routine for getting policy from user
 74  * @op: operation doing the user buffer copy
 75  * @userbuf: user buffer to copy data from  (NOT NULL)
 76  * @alloc_size: size of user buffer (REQUIRES: @alloc_size >= @copy_size)
 77  * @copy_size: size of data to copy from user buffer
 78  * @pos: position write is at in the file (NOT NULL)
 79  *
 80  * Returns: kernel buffer containing copy of user buffer data or an
 81  *          ERR_PTR on failure.
 82  */
 83 static char *aa_simple_write_to_buffer(int op, const char __user *userbuf,
 84                                        size_t alloc_size, size_t copy_size,
 85                                        loff_t *pos)
 86 {
 87         char *data;
 88 
 89         BUG_ON(copy_size > alloc_size);
 90 
 91         if (*pos != 0)
 92                 /* only writes from pos 0, that is complete writes */
 93                 return ERR_PTR(-ESPIPE);
 94 
 95         /*
 96          * Don't allow profile load/replace/remove from profiles that don't
 97          * have CAP_MAC_ADMIN
 98          */
 99         if (!aa_may_manage_policy(op))
100                 return ERR_PTR(-EACCES);
101 
102         /* freed by caller to simple_write_to_buffer */
103         data = kvmalloc(alloc_size);
104         if (data == NULL)
105                 return ERR_PTR(-ENOMEM);
106 
107         if (copy_from_user(data, userbuf, copy_size)) {
108                 kvfree(data);
109                 return ERR_PTR(-EFAULT);
110         }
111 
112         return data;
113 }
114 
115 
116 /* .load file hook fn to load policy */
117 static ssize_t profile_load(struct file *f, const char __user *buf, size_t size,
118                             loff_t *pos)
119 {
120         char *data;
121         ssize_t error;
122 
123         data = aa_simple_write_to_buffer(OP_PROF_LOAD, buf, size, size, pos);
124 
125         error = PTR_ERR(data);
126         if (!IS_ERR(data)) {
127                 error = aa_replace_profiles(data, size, PROF_ADD);
128                 kvfree(data);
129         }
130 
131         return error;
132 }
133 
134 static const struct file_operations aa_fs_profile_load = {
135         .write = profile_load,
136         .llseek = default_llseek,
137 };
138 
139 /* .replace file hook fn to load and/or replace policy */
140 static ssize_t profile_replace(struct file *f, const char __user *buf,
141                                size_t size, loff_t *pos)
142 {
143         char *data;
144         ssize_t error;
145 
146         data = aa_simple_write_to_buffer(OP_PROF_REPL, buf, size, size, pos);
147         error = PTR_ERR(data);
148         if (!IS_ERR(data)) {
149                 error = aa_replace_profiles(data, size, PROF_REPLACE);
150                 kvfree(data);
151         }
152 
153         return error;
154 }
155 
156 static const struct file_operations aa_fs_profile_replace = {
157         .write = profile_replace,
158         .llseek = default_llseek,
159 };
160 
161 /* .remove file hook fn to remove loaded policy */
162 static ssize_t profile_remove(struct file *f, const char __user *buf,
163                               size_t size, loff_t *pos)
164 {
165         char *data;
166         ssize_t error;
167 
168         /*
169          * aa_remove_profile needs a null terminated string so 1 extra
170          * byte is allocated and the copied data is null terminated.
171          */
172         data = aa_simple_write_to_buffer(OP_PROF_RM, buf, size + 1, size, pos);
173 
174         error = PTR_ERR(data);
175         if (!IS_ERR(data)) {
176                 data[size] = 0;
177                 error = aa_remove_profiles(data, size);
178                 kvfree(data);
179         }
180 
181         return error;
182 }
183 
184 static const struct file_operations aa_fs_profile_remove = {
185         .write = profile_remove,
186         .llseek = default_llseek,
187 };
188 
189 static int aa_fs_seq_show(struct seq_file *seq, void *v)
190 {
191         struct aa_fs_entry *fs_file = seq->private;
192 
193         if (!fs_file)
194                 return 0;
195 
196         switch (fs_file->v_type) {
197         case AA_FS_TYPE_BOOLEAN:
198                 seq_printf(seq, "%s\n", fs_file->v.boolean ? "yes" : "no");
199                 break;
200         case AA_FS_TYPE_STRING:
201                 seq_printf(seq, "%s\n", fs_file->v.string);
202                 break;
203         case AA_FS_TYPE_U64:
204                 seq_printf(seq, "%#08lx\n", fs_file->v.u64);
205                 break;
206         default:
207                 /* Ignore unpritable entry types. */
208                 break;
209         }
210 
211         return 0;
212 }
213 
214 static int aa_fs_seq_open(struct inode *inode, struct file *file)
215 {
216         return single_open(file, aa_fs_seq_show, inode->i_private);
217 }
218 
219 const struct file_operations aa_fs_seq_file_ops = {
220         .owner          = THIS_MODULE,
221         .open           = aa_fs_seq_open,
222         .read           = seq_read,
223         .llseek         = seq_lseek,
224         .release        = single_release,
225 };
226 
227 static int aa_fs_seq_profile_open(struct inode *inode, struct file *file,
228                                   int (*show)(struct seq_file *, void *))
229 {
230         struct aa_replacedby *r = aa_get_replacedby(inode->i_private);
231         int error = single_open(file, show, r);
232 
233         if (error) {
234                 file->private_data = NULL;
235                 aa_put_replacedby(r);
236         }
237 
238         return error;
239 }
240 
241 static int aa_fs_seq_profile_release(struct inode *inode, struct file *file)
242 {
243         struct seq_file *seq = (struct seq_file *) file->private_data;
244         if (seq)
245                 aa_put_replacedby(seq->private);
246         return single_release(inode, file);
247 }
248 
249 static int aa_fs_seq_profname_show(struct seq_file *seq, void *v)
250 {
251         struct aa_replacedby *r = seq->private;
252         struct aa_profile *profile = aa_get_profile_rcu(&r->profile);
253         seq_printf(seq, "%s\n", profile->base.name);
254         aa_put_profile(profile);
255 
256         return 0;
257 }
258 
259 static int aa_fs_seq_profname_open(struct inode *inode, struct file *file)
260 {
261         return aa_fs_seq_profile_open(inode, file, aa_fs_seq_profname_show);
262 }
263 
264 static const struct file_operations aa_fs_profname_fops = {
265         .owner          = THIS_MODULE,
266         .open           = aa_fs_seq_profname_open,
267         .read           = seq_read,
268         .llseek         = seq_lseek,
269         .release        = aa_fs_seq_profile_release,
270 };
271 
272 static int aa_fs_seq_profmode_show(struct seq_file *seq, void *v)
273 {
274         struct aa_replacedby *r = seq->private;
275         struct aa_profile *profile = aa_get_profile_rcu(&r->profile);
276         seq_printf(seq, "%s\n", aa_profile_mode_names[profile->mode]);
277         aa_put_profile(profile);
278 
279         return 0;
280 }
281 
282 static int aa_fs_seq_profmode_open(struct inode *inode, struct file *file)
283 {
284         return aa_fs_seq_profile_open(inode, file, aa_fs_seq_profmode_show);
285 }
286 
287 static const struct file_operations aa_fs_profmode_fops = {
288         .owner          = THIS_MODULE,
289         .open           = aa_fs_seq_profmode_open,
290         .read           = seq_read,
291         .llseek         = seq_lseek,
292         .release        = aa_fs_seq_profile_release,
293 };
294 
295 static int aa_fs_seq_profattach_show(struct seq_file *seq, void *v)
296 {
297         struct aa_replacedby *r = seq->private;
298         struct aa_profile *profile = aa_get_profile_rcu(&r->profile);
299         if (profile->attach)
300                 seq_printf(seq, "%s\n", profile->attach);
301         else if (profile->xmatch)
302                 seq_puts(seq, "<unknown>\n");
303         else
304                 seq_printf(seq, "%s\n", profile->base.name);
305         aa_put_profile(profile);
306 
307         return 0;
308 }
309 
310 static int aa_fs_seq_profattach_open(struct inode *inode, struct file *file)
311 {
312         return aa_fs_seq_profile_open(inode, file, aa_fs_seq_profattach_show);
313 }
314 
315 static const struct file_operations aa_fs_profattach_fops = {
316         .owner          = THIS_MODULE,
317         .open           = aa_fs_seq_profattach_open,
318         .read           = seq_read,
319         .llseek         = seq_lseek,
320         .release        = aa_fs_seq_profile_release,
321 };
322 
323 static int aa_fs_seq_hash_show(struct seq_file *seq, void *v)
324 {
325         struct aa_replacedby *r = seq->private;
326         struct aa_profile *profile = aa_get_profile_rcu(&r->profile);
327         unsigned int i, size = aa_hash_size();
328 
329         if (profile->hash) {
330                 for (i = 0; i < size; i++)
331                         seq_printf(seq, "%.2x", profile->hash[i]);
332                 seq_puts(seq, "\n");
333         }
334 
335         return 0;
336 }
337 
338 static int aa_fs_seq_hash_open(struct inode *inode, struct file *file)
339 {
340         return single_open(file, aa_fs_seq_hash_show, inode->i_private);
341 }
342 
343 static const struct file_operations aa_fs_seq_hash_fops = {
344         .owner          = THIS_MODULE,
345         .open           = aa_fs_seq_hash_open,
346         .read           = seq_read,
347         .llseek         = seq_lseek,
348         .release        = single_release,
349 };
350 
351 /** fns to setup dynamic per profile/namespace files **/
352 void __aa_fs_profile_rmdir(struct aa_profile *profile)
353 {
354         struct aa_profile *child;
355         int i;
356 
357         if (!profile)
358                 return;
359 
360         list_for_each_entry(child, &profile->base.profiles, base.list)
361                 __aa_fs_profile_rmdir(child);
362 
363         for (i = AAFS_PROF_SIZEOF - 1; i >= 0; --i) {
364                 struct aa_replacedby *r;
365                 if (!profile->dents[i])
366                         continue;
367 
368                 r = profile->dents[i]->d_inode->i_private;
369                 securityfs_remove(profile->dents[i]);
370                 aa_put_replacedby(r);
371                 profile->dents[i] = NULL;
372         }
373 }
374 
375 void __aa_fs_profile_migrate_dents(struct aa_profile *old,
376                                    struct aa_profile *new)
377 {
378         int i;
379 
380         for (i = 0; i < AAFS_PROF_SIZEOF; i++) {
381                 new->dents[i] = old->dents[i];
382                 old->dents[i] = NULL;
383         }
384 }
385 
386 static struct dentry *create_profile_file(struct dentry *dir, const char *name,
387                                           struct aa_profile *profile,
388                                           const struct file_operations *fops)
389 {
390         struct aa_replacedby *r = aa_get_replacedby(profile->replacedby);
391         struct dentry *dent;
392 
393         dent = securityfs_create_file(name, S_IFREG | 0444, dir, r, fops);
394         if (IS_ERR(dent))
395                 aa_put_replacedby(r);
396 
397         return dent;
398 }
399 
400 /* requires lock be held */
401 int __aa_fs_profile_mkdir(struct aa_profile *profile, struct dentry *parent)
402 {
403         struct aa_profile *child;
404         struct dentry *dent = NULL, *dir;
405         int error;
406 
407         if (!parent) {
408                 struct aa_profile *p;
409                 p = aa_deref_parent(profile);
410                 dent = prof_dir(p);
411                 /* adding to parent that previously didn't have children */
412                 dent = securityfs_create_dir("profiles", dent);
413                 if (IS_ERR(dent))
414                         goto fail;
415                 prof_child_dir(p) = parent = dent;
416         }
417 
418         if (!profile->dirname) {
419                 int len, id_len;
420                 len = mangle_name(profile->base.name, NULL);
421                 id_len = snprintf(NULL, 0, ".%ld", profile->ns->uniq_id);
422 
423                 profile->dirname = kmalloc(len + id_len + 1, GFP_KERNEL);
424                 if (!profile->dirname)
425                         goto fail;
426 
427                 mangle_name(profile->base.name, profile->dirname);
428                 sprintf(profile->dirname + len, ".%ld", profile->ns->uniq_id++);
429         }
430 
431         dent = securityfs_create_dir(profile->dirname, parent);
432         if (IS_ERR(dent))
433                 goto fail;
434         prof_dir(profile) = dir = dent;
435 
436         dent = create_profile_file(dir, "name", profile, &aa_fs_profname_fops);
437         if (IS_ERR(dent))
438                 goto fail;
439         profile->dents[AAFS_PROF_NAME] = dent;
440 
441         dent = create_profile_file(dir, "mode", profile, &aa_fs_profmode_fops);
442         if (IS_ERR(dent))
443                 goto fail;
444         profile->dents[AAFS_PROF_MODE] = dent;
445 
446         dent = create_profile_file(dir, "attach", profile,
447                                    &aa_fs_profattach_fops);
448         if (IS_ERR(dent))
449                 goto fail;
450         profile->dents[AAFS_PROF_ATTACH] = dent;
451 
452         if (profile->hash) {
453                 dent = create_profile_file(dir, "sha1", profile,
454                                            &aa_fs_seq_hash_fops);
455                 if (IS_ERR(dent))
456                         goto fail;
457                 profile->dents[AAFS_PROF_HASH] = dent;
458         }
459 
460         list_for_each_entry(child, &profile->base.profiles, base.list) {
461                 error = __aa_fs_profile_mkdir(child, prof_child_dir(profile));
462                 if (error)
463                         goto fail2;
464         }
465 
466         return 0;
467 
468 fail:
469         error = PTR_ERR(dent);
470 
471 fail2:
472         __aa_fs_profile_rmdir(profile);
473 
474         return error;
475 }
476 
477 void __aa_fs_namespace_rmdir(struct aa_namespace *ns)
478 {
479         struct aa_namespace *sub;
480         struct aa_profile *child;
481         int i;
482 
483         if (!ns)
484                 return;
485 
486         list_for_each_entry(child, &ns->base.profiles, base.list)
487                 __aa_fs_profile_rmdir(child);
488 
489         list_for_each_entry(sub, &ns->sub_ns, base.list) {
490                 mutex_lock(&sub->lock);
491                 __aa_fs_namespace_rmdir(sub);
492                 mutex_unlock(&sub->lock);
493         }
494 
495         for (i = AAFS_NS_SIZEOF - 1; i >= 0; --i) {
496                 securityfs_remove(ns->dents[i]);
497                 ns->dents[i] = NULL;
498         }
499 }
500 
501 int __aa_fs_namespace_mkdir(struct aa_namespace *ns, struct dentry *parent,
502                             const char *name)
503 {
504         struct aa_namespace *sub;
505         struct aa_profile *child;
506         struct dentry *dent, *dir;
507         int error;
508 
509         if (!name)
510                 name = ns->base.name;
511 
512         dent = securityfs_create_dir(name, parent);
513         if (IS_ERR(dent))
514                 goto fail;
515         ns_dir(ns) = dir = dent;
516 
517         dent = securityfs_create_dir("profiles", dir);
518         if (IS_ERR(dent))
519                 goto fail;
520         ns_subprofs_dir(ns) = dent;
521 
522         dent = securityfs_create_dir("namespaces", dir);
523         if (IS_ERR(dent))
524                 goto fail;
525         ns_subns_dir(ns) = dent;
526 
527         list_for_each_entry(child, &ns->base.profiles, base.list) {
528                 error = __aa_fs_profile_mkdir(child, ns_subprofs_dir(ns));
529                 if (error)
530                         goto fail2;
531         }
532 
533         list_for_each_entry(sub, &ns->sub_ns, base.list) {
534                 mutex_lock(&sub->lock);
535                 error = __aa_fs_namespace_mkdir(sub, ns_subns_dir(ns), NULL);
536                 mutex_unlock(&sub->lock);
537                 if (error)
538                         goto fail2;
539         }
540 
541         return 0;
542 
543 fail:
544         error = PTR_ERR(dent);
545 
546 fail2:
547         __aa_fs_namespace_rmdir(ns);
548 
549         return error;
550 }
551 
552 
553 #define list_entry_next(pos, member) \
554         list_entry(pos->member.next, typeof(*pos), member)
555 #define list_entry_is_head(pos, head, member) (&pos->member == (head))
556 
557 /**
558  * __next_namespace - find the next namespace to list
559  * @root: root namespace to stop search at (NOT NULL)
560  * @ns: current ns position (NOT NULL)
561  *
562  * Find the next namespace from @ns under @root and handle all locking needed
563  * while switching current namespace.
564  *
565  * Returns: next namespace or NULL if at last namespace under @root
566  * Requires: ns->parent->lock to be held
567  * NOTE: will not unlock root->lock
568  */
569 static struct aa_namespace *__next_namespace(struct aa_namespace *root,
570                                              struct aa_namespace *ns)
571 {
572         struct aa_namespace *parent, *next;
573 
574         /* is next namespace a child */
575         if (!list_empty(&ns->sub_ns)) {
576                 next = list_first_entry(&ns->sub_ns, typeof(*ns), base.list);
577                 mutex_lock(&next->lock);
578                 return next;
579         }
580 
581         /* check if the next ns is a sibling, parent, gp, .. */
582         parent = ns->parent;
583         while (ns != root) {
584                 mutex_unlock(&ns->lock);
585                 next = list_entry_next(ns, base.list);
586                 if (!list_entry_is_head(next, &parent->sub_ns, base.list)) {
587                         mutex_lock(&next->lock);
588                         return next;
589                 }
590                 ns = parent;
591                 parent = parent->parent;
592         }
593 
594         return NULL;
595 }
596 
597 /**
598  * __first_profile - find the first profile in a namespace
599  * @root: namespace that is root of profiles being displayed (NOT NULL)
600  * @ns: namespace to start in   (NOT NULL)
601  *
602  * Returns: unrefcounted profile or NULL if no profile
603  * Requires: profile->ns.lock to be held
604  */
605 static struct aa_profile *__first_profile(struct aa_namespace *root,
606                                           struct aa_namespace *ns)
607 {
608         for (; ns; ns = __next_namespace(root, ns)) {
609                 if (!list_empty(&ns->base.profiles))
610                         return list_first_entry(&ns->base.profiles,
611                                                 struct aa_profile, base.list);
612         }
613         return NULL;
614 }
615 
616 /**
617  * __next_profile - step to the next profile in a profile tree
618  * @profile: current profile in tree (NOT NULL)
619  *
620  * Perform a depth first traversal on the profile tree in a namespace
621  *
622  * Returns: next profile or NULL if done
623  * Requires: profile->ns.lock to be held
624  */
625 static struct aa_profile *__next_profile(struct aa_profile *p)
626 {
627         struct aa_profile *parent;
628         struct aa_namespace *ns = p->ns;
629 
630         /* is next profile a child */
631         if (!list_empty(&p->base.profiles))
632                 return list_first_entry(&p->base.profiles, typeof(*p),
633                                         base.list);
634 
635         /* is next profile a sibling, parent sibling, gp, sibling, .. */
636         parent = rcu_dereference_protected(p->parent,
637                                            mutex_is_locked(&p->ns->lock));
638         while (parent) {
639                 p = list_entry_next(p, base.list);
640                 if (!list_entry_is_head(p, &parent->base.profiles, base.list))
641                         return p;
642                 p = parent;
643                 parent = rcu_dereference_protected(parent->parent,
644                                             mutex_is_locked(&parent->ns->lock));
645         }
646 
647         /* is next another profile in the namespace */
648         p = list_entry_next(p, base.list);
649         if (!list_entry_is_head(p, &ns->base.profiles, base.list))
650                 return p;
651 
652         return NULL;
653 }
654 
655 /**
656  * next_profile - step to the next profile in where ever it may be
657  * @root: root namespace  (NOT NULL)
658  * @profile: current profile  (NOT NULL)
659  *
660  * Returns: next profile or NULL if there isn't one
661  */
662 static struct aa_profile *next_profile(struct aa_namespace *root,
663                                        struct aa_profile *profile)
664 {
665         struct aa_profile *next = __next_profile(profile);
666         if (next)
667                 return next;
668 
669         /* finished all profiles in namespace move to next namespace */
670         return __first_profile(root, __next_namespace(root, profile->ns));
671 }
672 
673 /**
674  * p_start - start a depth first traversal of profile tree
675  * @f: seq_file to fill
676  * @pos: current position
677  *
678  * Returns: first profile under current namespace or NULL if none found
679  *
680  * acquires first ns->lock
681  */
682 static void *p_start(struct seq_file *f, loff_t *pos)
683 {
684         struct aa_profile *profile = NULL;
685         struct aa_namespace *root = aa_current_profile()->ns;
686         loff_t l = *pos;
687         f->private = aa_get_namespace(root);
688 
689 
690         /* find the first profile */
691         mutex_lock(&root->lock);
692         profile = __first_profile(root, root);
693 
694         /* skip to position */
695         for (; profile && l > 0; l--)
696                 profile = next_profile(root, profile);
697 
698         return profile;
699 }
700 
701 /**
702  * p_next - read the next profile entry
703  * @f: seq_file to fill
704  * @p: profile previously returned
705  * @pos: current position
706  *
707  * Returns: next profile after @p or NULL if none
708  *
709  * may acquire/release locks in namespace tree as necessary
710  */
711 static void *p_next(struct seq_file *f, void *p, loff_t *pos)
712 {
713         struct aa_profile *profile = p;
714         struct aa_namespace *ns = f->private;
715         (*pos)++;
716 
717         return next_profile(ns, profile);
718 }
719 
720 /**
721  * p_stop - stop depth first traversal
722  * @f: seq_file we are filling
723  * @p: the last profile writen
724  *
725  * Release all locking done by p_start/p_next on namespace tree
726  */
727 static void p_stop(struct seq_file *f, void *p)
728 {
729         struct aa_profile *profile = p;
730         struct aa_namespace *root = f->private, *ns;
731 
732         if (profile) {
733                 for (ns = profile->ns; ns && ns != root; ns = ns->parent)
734                         mutex_unlock(&ns->lock);
735         }
736         mutex_unlock(&root->lock);
737         aa_put_namespace(root);
738 }
739 
740 /**
741  * seq_show_profile - show a profile entry
742  * @f: seq_file to file
743  * @p: current position (profile)    (NOT NULL)
744  *
745  * Returns: error on failure
746  */
747 static int seq_show_profile(struct seq_file *f, void *p)
748 {
749         struct aa_profile *profile = (struct aa_profile *)p;
750         struct aa_namespace *root = f->private;
751 
752         if (profile->ns != root)
753                 seq_printf(f, ":%s://", aa_ns_name(root, profile->ns));
754         seq_printf(f, "%s (%s)\n", profile->base.hname,
755                    aa_profile_mode_names[profile->mode]);
756 
757         return 0;
758 }
759 
760 static const struct seq_operations aa_fs_profiles_op = {
761         .start = p_start,
762         .next = p_next,
763         .stop = p_stop,
764         .show = seq_show_profile,
765 };
766 
767 static int profiles_open(struct inode *inode, struct file *file)
768 {
769         return seq_open(file, &aa_fs_profiles_op);
770 }
771 
772 static int profiles_release(struct inode *inode, struct file *file)
773 {
774         return seq_release(inode, file);
775 }
776 
777 static const struct file_operations aa_fs_profiles_fops = {
778         .open = profiles_open,
779         .read = seq_read,
780         .llseek = seq_lseek,
781         .release = profiles_release,
782 };
783 
784 
785 /** Base file system setup **/
786 static struct aa_fs_entry aa_fs_entry_file[] = {
787         AA_FS_FILE_STRING("mask", "create read write exec append mmap_exec " \
788                                   "link lock"),
789         { }
790 };
791 
792 static struct aa_fs_entry aa_fs_entry_domain[] = {
793         AA_FS_FILE_BOOLEAN("change_hat",        1),
794         AA_FS_FILE_BOOLEAN("change_hatv",       1),
795         AA_FS_FILE_BOOLEAN("change_onexec",     1),
796         AA_FS_FILE_BOOLEAN("change_profile",    1),
797         { }
798 };
799 
800 static struct aa_fs_entry aa_fs_entry_policy[] = {
801         AA_FS_FILE_BOOLEAN("set_load",          1),
802         {}
803 };
804 
805 static struct aa_fs_entry aa_fs_entry_features[] = {
806         AA_FS_DIR("policy",                     aa_fs_entry_policy),
807         AA_FS_DIR("domain",                     aa_fs_entry_domain),
808         AA_FS_DIR("file",                       aa_fs_entry_file),
809         AA_FS_FILE_U64("capability",            VFS_CAP_FLAGS_MASK),
810         AA_FS_DIR("rlimit",                     aa_fs_entry_rlimit),
811         AA_FS_DIR("caps",                       aa_fs_entry_caps),
812         { }
813 };
814 
815 static struct aa_fs_entry aa_fs_entry_apparmor[] = {
816         AA_FS_FILE_FOPS(".load", 0640, &aa_fs_profile_load),
817         AA_FS_FILE_FOPS(".replace", 0640, &aa_fs_profile_replace),
818         AA_FS_FILE_FOPS(".remove", 0640, &aa_fs_profile_remove),
819         AA_FS_FILE_FOPS("profiles", 0640, &aa_fs_profiles_fops),
820         AA_FS_DIR("features", aa_fs_entry_features),
821         { }
822 };
823 
824 static struct aa_fs_entry aa_fs_entry =
825         AA_FS_DIR("apparmor", aa_fs_entry_apparmor);
826 
827 /**
828  * aafs_create_file - create a file entry in the apparmor securityfs
829  * @fs_file: aa_fs_entry to build an entry for (NOT NULL)
830  * @parent: the parent dentry in the securityfs
831  *
832  * Use aafs_remove_file to remove entries created with this fn.
833  */
834 static int __init aafs_create_file(struct aa_fs_entry *fs_file,
835                                    struct dentry *parent)
836 {
837         int error = 0;
838 
839         fs_file->dentry = securityfs_create_file(fs_file->name,
840                                                  S_IFREG | fs_file->mode,
841                                                  parent, fs_file,
842                                                  fs_file->file_ops);
843         if (IS_ERR(fs_file->dentry)) {
844                 error = PTR_ERR(fs_file->dentry);
845                 fs_file->dentry = NULL;
846         }
847         return error;
848 }
849 
850 static void __init aafs_remove_dir(struct aa_fs_entry *fs_dir);
851 /**
852  * aafs_create_dir - recursively create a directory entry in the securityfs
853  * @fs_dir: aa_fs_entry (and all child entries) to build (NOT NULL)
854  * @parent: the parent dentry in the securityfs
855  *
856  * Use aafs_remove_dir to remove entries created with this fn.
857  */
858 static int __init aafs_create_dir(struct aa_fs_entry *fs_dir,
859                                   struct dentry *parent)
860 {
861         struct aa_fs_entry *fs_file;
862         struct dentry *dir;
863         int error;
864 
865         dir = securityfs_create_dir(fs_dir->name, parent);
866         if (IS_ERR(dir))
867                 return PTR_ERR(dir);
868         fs_dir->dentry = dir;
869 
870         for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) {
871                 if (fs_file->v_type == AA_FS_TYPE_DIR)
872                         error = aafs_create_dir(fs_file, fs_dir->dentry);
873                 else
874                         error = aafs_create_file(fs_file, fs_dir->dentry);
875                 if (error)
876                         goto failed;
877         }
878 
879         return 0;
880 
881 failed:
882         aafs_remove_dir(fs_dir);
883 
884         return error;
885 }
886 
887 /**
888  * aafs_remove_file - drop a single file entry in the apparmor securityfs
889  * @fs_file: aa_fs_entry to detach from the securityfs (NOT NULL)
890  */
891 static void __init aafs_remove_file(struct aa_fs_entry *fs_file)
892 {
893         if (!fs_file->dentry)
894                 return;
895 
896         securityfs_remove(fs_file->dentry);
897         fs_file->dentry = NULL;
898 }
899 
900 /**
901  * aafs_remove_dir - recursively drop a directory entry from the securityfs
902  * @fs_dir: aa_fs_entry (and all child entries) to detach (NOT NULL)
903  */
904 static void __init aafs_remove_dir(struct aa_fs_entry *fs_dir)
905 {
906         struct aa_fs_entry *fs_file;
907 
908         for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) {
909                 if (fs_file->v_type == AA_FS_TYPE_DIR)
910                         aafs_remove_dir(fs_file);
911                 else
912                         aafs_remove_file(fs_file);
913         }
914 
915         aafs_remove_file(fs_dir);
916 }
917 
918 /**
919  * aa_destroy_aafs - cleanup and free aafs
920  *
921  * releases dentries allocated by aa_create_aafs
922  */
923 void __init aa_destroy_aafs(void)
924 {
925         aafs_remove_dir(&aa_fs_entry);
926 }
927 
928 /**
929  * aa_create_aafs - create the apparmor security filesystem
930  *
931  * dentries created here are released by aa_destroy_aafs
932  *
933  * Returns: error on failure
934  */
935 static int __init aa_create_aafs(void)
936 {
937         int error;
938 
939         if (!apparmor_initialized)
940                 return 0;
941 
942         if (aa_fs_entry.dentry) {
943                 AA_ERROR("%s: AppArmor securityfs already exists\n", __func__);
944                 return -EEXIST;
945         }
946 
947         /* Populate fs tree. */
948         error = aafs_create_dir(&aa_fs_entry, NULL);
949         if (error)
950                 goto error;
951 
952         error = __aa_fs_namespace_mkdir(root_ns, aa_fs_entry.dentry,
953                                         "policy");
954         if (error)
955                 goto error;
956 
957         /* TODO: add support for apparmorfs_null and apparmorfs_mnt */
958 
959         /* Report that AppArmor fs is enabled */
960         aa_info_message("AppArmor Filesystem Enabled");
961         return 0;
962 
963 error:
964         aa_destroy_aafs();
965         AA_ERROR("Error creating AppArmor securityfs\n");
966         return error;
967 }
968 
969 fs_initcall(aa_create_aafs);
970 

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