~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

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

Version: ~ [ linux-5.16-rc3 ] ~ [ linux-5.15.5 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.82 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.162 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.218 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.256 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.291 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.293 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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/mount.h>
 22 #include <linux/namei.h>
 23 #include <linux/capability.h>
 24 #include <linux/rcupdate.h>
 25 #include <uapi/linux/major.h>
 26 #include <linux/fs.h>
 27 
 28 #include "include/apparmor.h"
 29 #include "include/apparmorfs.h"
 30 #include "include/audit.h"
 31 #include "include/context.h"
 32 #include "include/crypto.h"
 33 #include "include/policy.h"
 34 #include "include/policy_ns.h"
 35 #include "include/resource.h"
 36 #include "include/policy_unpack.h"
 37 
 38 /**
 39  * aa_mangle_name - mangle a profile name to std profile layout form
 40  * @name: profile name to mangle  (NOT NULL)
 41  * @target: buffer to store mangled name, same length as @name (MAYBE NULL)
 42  *
 43  * Returns: length of mangled name
 44  */
 45 static int mangle_name(const char *name, char *target)
 46 {
 47         char *t = target;
 48 
 49         while (*name == '/' || *name == '.')
 50                 name++;
 51 
 52         if (target) {
 53                 for (; *name; name++) {
 54                         if (*name == '/')
 55                                 *(t)++ = '.';
 56                         else if (isspace(*name))
 57                                 *(t)++ = '_';
 58                         else if (isalnum(*name) || strchr("._-", *name))
 59                                 *(t)++ = *name;
 60                 }
 61 
 62                 *t = 0;
 63         } else {
 64                 int len = 0;
 65                 for (; *name; name++) {
 66                         if (isalnum(*name) || isspace(*name) ||
 67                             strchr("/._-", *name))
 68                                 len++;
 69                 }
 70 
 71                 return len;
 72         }
 73 
 74         return t - target;
 75 }
 76 
 77 /**
 78  * aa_simple_write_to_buffer - common routine for getting policy from user
 79  * @userbuf: user buffer to copy data from  (NOT NULL)
 80  * @alloc_size: size of user buffer (REQUIRES: @alloc_size >= @copy_size)
 81  * @copy_size: size of data to copy from user buffer
 82  * @pos: position write is at in the file (NOT NULL)
 83  *
 84  * Returns: kernel buffer containing copy of user buffer data or an
 85  *          ERR_PTR on failure.
 86  */
 87 static struct aa_loaddata *aa_simple_write_to_buffer(const char __user *userbuf,
 88                                                      size_t alloc_size,
 89                                                      size_t copy_size,
 90                                                      loff_t *pos)
 91 {
 92         struct aa_loaddata *data;
 93 
 94         AA_BUG(copy_size > alloc_size);
 95 
 96         if (*pos != 0)
 97                 /* only writes from pos 0, that is complete writes */
 98                 return ERR_PTR(-ESPIPE);
 99 
100         /* freed by caller to simple_write_to_buffer */
101         data = kvmalloc(sizeof(*data) + alloc_size);
102         if (data == NULL)
103                 return ERR_PTR(-ENOMEM);
104         kref_init(&data->count);
105         data->size = copy_size;
106         data->hash = NULL;
107         data->abi = 0;
108 
109         if (copy_from_user(data->data, userbuf, copy_size)) {
110                 kvfree(data);
111                 return ERR_PTR(-EFAULT);
112         }
113 
114         return data;
115 }
116 
117 static ssize_t policy_update(int binop, const char __user *buf, size_t size,
118                              loff_t *pos, struct aa_ns *ns)
119 {
120         ssize_t error;
121         struct aa_loaddata *data;
122         struct aa_profile *profile = aa_current_profile();
123         const char *op = binop == PROF_ADD ? OP_PROF_LOAD : OP_PROF_REPL;
124         /* high level check about policy management - fine grained in
125          * below after unpack
126          */
127         error = aa_may_manage_policy(profile, ns, op);
128         if (error)
129                 return error;
130 
131         data = aa_simple_write_to_buffer(buf, size, size, pos);
132         error = PTR_ERR(data);
133         if (!IS_ERR(data)) {
134                 error = aa_replace_profiles(ns ? ns : profile->ns, profile,
135                                             binop, data);
136                 aa_put_loaddata(data);
137         }
138 
139         return error;
140 }
141 
142 /* .load file hook fn to load policy */
143 static ssize_t profile_load(struct file *f, const char __user *buf, size_t size,
144                             loff_t *pos)
145 {
146         struct aa_ns *ns = aa_get_ns(f->f_inode->i_private);
147         int error = policy_update(PROF_ADD, buf, size, pos, ns);
148 
149         aa_put_ns(ns);
150 
151         return error;
152 }
153 
154 static const struct file_operations aa_fs_profile_load = {
155         .write = profile_load,
156         .llseek = default_llseek,
157 };
158 
159 /* .replace file hook fn to load and/or replace policy */
160 static ssize_t profile_replace(struct file *f, const char __user *buf,
161                                size_t size, loff_t *pos)
162 {
163         struct aa_ns *ns = aa_get_ns(f->f_inode->i_private);
164         int error = policy_update(PROF_REPLACE, buf, size, pos, ns);
165 
166         aa_put_ns(ns);
167 
168         return error;
169 }
170 
171 static const struct file_operations aa_fs_profile_replace = {
172         .write = profile_replace,
173         .llseek = default_llseek,
174 };
175 
176 /* .remove file hook fn to remove loaded policy */
177 static ssize_t profile_remove(struct file *f, const char __user *buf,
178                               size_t size, loff_t *pos)
179 {
180         struct aa_loaddata *data;
181         struct aa_profile *profile;
182         ssize_t error;
183         struct aa_ns *ns = aa_get_ns(f->f_inode->i_private);
184 
185         profile = aa_current_profile();
186         /* high level check about policy management - fine grained in
187          * below after unpack
188          */
189         error = aa_may_manage_policy(profile, ns, OP_PROF_RM);
190         if (error)
191                 goto out;
192 
193         /*
194          * aa_remove_profile needs a null terminated string so 1 extra
195          * byte is allocated and the copied data is null terminated.
196          */
197         data = aa_simple_write_to_buffer(buf, size + 1, size, pos);
198 
199         error = PTR_ERR(data);
200         if (!IS_ERR(data)) {
201                 data->data[size] = 0;
202                 error = aa_remove_profiles(ns ? ns : profile->ns, profile,
203                                            data->data, size);
204                 aa_put_loaddata(data);
205         }
206  out:
207         aa_put_ns(ns);
208         return error;
209 }
210 
211 static const struct file_operations aa_fs_profile_remove = {
212         .write = profile_remove,
213         .llseek = default_llseek,
214 };
215 
216 /**
217  * query_data - queries a policy and writes its data to buf
218  * @buf: the resulting data is stored here (NOT NULL)
219  * @buf_len: size of buf
220  * @query: query string used to retrieve data
221  * @query_len: size of query including second NUL byte
222  *
223  * The buffers pointed to by buf and query may overlap. The query buffer is
224  * parsed before buf is written to.
225  *
226  * The query should look like "<LABEL>\0<KEY>\0", where <LABEL> is the name of
227  * the security confinement context and <KEY> is the name of the data to
228  * retrieve. <LABEL> and <KEY> must not be NUL-terminated.
229  *
230  * Don't expect the contents of buf to be preserved on failure.
231  *
232  * Returns: number of characters written to buf or -errno on failure
233  */
234 static ssize_t query_data(char *buf, size_t buf_len,
235                           char *query, size_t query_len)
236 {
237         char *out;
238         const char *key;
239         struct aa_profile *profile;
240         struct aa_data *data;
241         u32 bytes, blocks;
242         __le32 outle32;
243 
244         if (!query_len)
245                 return -EINVAL; /* need a query */
246 
247         key = query + strnlen(query, query_len) + 1;
248         if (key + 1 >= query + query_len)
249                 return -EINVAL; /* not enough space for a non-empty key */
250         if (key + strnlen(key, query + query_len - key) >= query + query_len)
251                 return -EINVAL; /* must end with NUL */
252 
253         if (buf_len < sizeof(bytes) + sizeof(blocks))
254                 return -EINVAL; /* not enough space */
255 
256         profile = aa_current_profile();
257 
258         /* We are going to leave space for two numbers. The first is the total
259          * number of bytes we are writing after the first number. This is so
260          * users can read the full output without reallocation.
261          *
262          * The second number is the number of data blocks we're writing. An
263          * application might be confined by multiple policies having data in
264          * the same key.
265          */
266         memset(buf, 0, sizeof(bytes) + sizeof(blocks));
267         out = buf + sizeof(bytes) + sizeof(blocks);
268 
269         blocks = 0;
270         if (profile->data) {
271                 data = rhashtable_lookup_fast(profile->data, &key,
272                                               profile->data->p);
273 
274                 if (data) {
275                         if (out + sizeof(outle32) + data->size > buf + buf_len)
276                                 return -EINVAL; /* not enough space */
277                         outle32 = __cpu_to_le32(data->size);
278                         memcpy(out, &outle32, sizeof(outle32));
279                         out += sizeof(outle32);
280                         memcpy(out, data->data, data->size);
281                         out += data->size;
282                         blocks++;
283                 }
284         }
285 
286         outle32 = __cpu_to_le32(out - buf - sizeof(bytes));
287         memcpy(buf, &outle32, sizeof(outle32));
288         outle32 = __cpu_to_le32(blocks);
289         memcpy(buf + sizeof(bytes), &outle32, sizeof(outle32));
290 
291         return out - buf;
292 }
293 
294 #define QUERY_CMD_DATA          "data\0"
295 #define QUERY_CMD_DATA_LEN      5
296 
297 /**
298  * aa_write_access - generic permissions and data query
299  * @file: pointer to open apparmorfs/access file
300  * @ubuf: user buffer containing the complete query string (NOT NULL)
301  * @count: size of ubuf
302  * @ppos: position in the file (MUST BE ZERO)
303  *
304  * Allows for one permissions or data query per open(), write(), and read()
305  * sequence. The only queries currently supported are label-based queries for
306  * permissions or data.
307  *
308  * For permissions queries, ubuf must begin with "label\0", followed by the
309  * profile query specific format described in the query_label() function
310  * documentation.
311  *
312  * For data queries, ubuf must have the form "data\0<LABEL>\0<KEY>\0", where
313  * <LABEL> is the name of the security confinement context and <KEY> is the
314  * name of the data to retrieve.
315  *
316  * Returns: number of bytes written or -errno on failure
317  */
318 static ssize_t aa_write_access(struct file *file, const char __user *ubuf,
319                                size_t count, loff_t *ppos)
320 {
321         char *buf;
322         ssize_t len;
323 
324         if (*ppos)
325                 return -ESPIPE;
326 
327         buf = simple_transaction_get(file, ubuf, count);
328         if (IS_ERR(buf))
329                 return PTR_ERR(buf);
330 
331         if (count > QUERY_CMD_DATA_LEN &&
332                    !memcmp(buf, QUERY_CMD_DATA, QUERY_CMD_DATA_LEN)) {
333                 len = query_data(buf, SIMPLE_TRANSACTION_LIMIT,
334                                  buf + QUERY_CMD_DATA_LEN,
335                                  count - QUERY_CMD_DATA_LEN);
336         } else
337                 len = -EINVAL;
338 
339         if (len < 0)
340                 return len;
341 
342         simple_transaction_set(file, len);
343 
344         return count;
345 }
346 
347 static const struct file_operations aa_fs_access = {
348         .write          = aa_write_access,
349         .read           = simple_transaction_read,
350         .release        = simple_transaction_release,
351         .llseek         = generic_file_llseek,
352 };
353 
354 static int aa_fs_seq_show(struct seq_file *seq, void *v)
355 {
356         struct aa_fs_entry *fs_file = seq->private;
357 
358         if (!fs_file)
359                 return 0;
360 
361         switch (fs_file->v_type) {
362         case AA_FS_TYPE_BOOLEAN:
363                 seq_printf(seq, "%s\n", fs_file->v.boolean ? "yes" : "no");
364                 break;
365         case AA_FS_TYPE_STRING:
366                 seq_printf(seq, "%s\n", fs_file->v.string);
367                 break;
368         case AA_FS_TYPE_U64:
369                 seq_printf(seq, "%#08lx\n", fs_file->v.u64);
370                 break;
371         default:
372                 /* Ignore unpritable entry types. */
373                 break;
374         }
375 
376         return 0;
377 }
378 
379 static int aa_fs_seq_open(struct inode *inode, struct file *file)
380 {
381         return single_open(file, aa_fs_seq_show, inode->i_private);
382 }
383 
384 const struct file_operations aa_fs_seq_file_ops = {
385         .owner          = THIS_MODULE,
386         .open           = aa_fs_seq_open,
387         .read           = seq_read,
388         .llseek         = seq_lseek,
389         .release        = single_release,
390 };
391 
392 static int aa_fs_seq_profile_open(struct inode *inode, struct file *file,
393                                   int (*show)(struct seq_file *, void *))
394 {
395         struct aa_proxy *proxy = aa_get_proxy(inode->i_private);
396         int error = single_open(file, show, proxy);
397 
398         if (error) {
399                 file->private_data = NULL;
400                 aa_put_proxy(proxy);
401         }
402 
403         return error;
404 }
405 
406 static int aa_fs_seq_profile_release(struct inode *inode, struct file *file)
407 {
408         struct seq_file *seq = (struct seq_file *) file->private_data;
409         if (seq)
410                 aa_put_proxy(seq->private);
411         return single_release(inode, file);
412 }
413 
414 static int aa_fs_seq_profname_show(struct seq_file *seq, void *v)
415 {
416         struct aa_proxy *proxy = seq->private;
417         struct aa_profile *profile = aa_get_profile_rcu(&proxy->profile);
418         seq_printf(seq, "%s\n", profile->base.name);
419         aa_put_profile(profile);
420 
421         return 0;
422 }
423 
424 static int aa_fs_seq_profname_open(struct inode *inode, struct file *file)
425 {
426         return aa_fs_seq_profile_open(inode, file, aa_fs_seq_profname_show);
427 }
428 
429 static const struct file_operations aa_fs_profname_fops = {
430         .owner          = THIS_MODULE,
431         .open           = aa_fs_seq_profname_open,
432         .read           = seq_read,
433         .llseek         = seq_lseek,
434         .release        = aa_fs_seq_profile_release,
435 };
436 
437 static int aa_fs_seq_profmode_show(struct seq_file *seq, void *v)
438 {
439         struct aa_proxy *proxy = seq->private;
440         struct aa_profile *profile = aa_get_profile_rcu(&proxy->profile);
441         seq_printf(seq, "%s\n", aa_profile_mode_names[profile->mode]);
442         aa_put_profile(profile);
443 
444         return 0;
445 }
446 
447 static int aa_fs_seq_profmode_open(struct inode *inode, struct file *file)
448 {
449         return aa_fs_seq_profile_open(inode, file, aa_fs_seq_profmode_show);
450 }
451 
452 static const struct file_operations aa_fs_profmode_fops = {
453         .owner          = THIS_MODULE,
454         .open           = aa_fs_seq_profmode_open,
455         .read           = seq_read,
456         .llseek         = seq_lseek,
457         .release        = aa_fs_seq_profile_release,
458 };
459 
460 static int aa_fs_seq_profattach_show(struct seq_file *seq, void *v)
461 {
462         struct aa_proxy *proxy = seq->private;
463         struct aa_profile *profile = aa_get_profile_rcu(&proxy->profile);
464         if (profile->attach)
465                 seq_printf(seq, "%s\n", profile->attach);
466         else if (profile->xmatch)
467                 seq_puts(seq, "<unknown>\n");
468         else
469                 seq_printf(seq, "%s\n", profile->base.name);
470         aa_put_profile(profile);
471 
472         return 0;
473 }
474 
475 static int aa_fs_seq_profattach_open(struct inode *inode, struct file *file)
476 {
477         return aa_fs_seq_profile_open(inode, file, aa_fs_seq_profattach_show);
478 }
479 
480 static const struct file_operations aa_fs_profattach_fops = {
481         .owner          = THIS_MODULE,
482         .open           = aa_fs_seq_profattach_open,
483         .read           = seq_read,
484         .llseek         = seq_lseek,
485         .release        = aa_fs_seq_profile_release,
486 };
487 
488 static int aa_fs_seq_hash_show(struct seq_file *seq, void *v)
489 {
490         struct aa_proxy *proxy = seq->private;
491         struct aa_profile *profile = aa_get_profile_rcu(&proxy->profile);
492         unsigned int i, size = aa_hash_size();
493 
494         if (profile->hash) {
495                 for (i = 0; i < size; i++)
496                         seq_printf(seq, "%.2x", profile->hash[i]);
497                 seq_puts(seq, "\n");
498         }
499         aa_put_profile(profile);
500 
501         return 0;
502 }
503 
504 static int aa_fs_seq_hash_open(struct inode *inode, struct file *file)
505 {
506         return single_open(file, aa_fs_seq_hash_show, inode->i_private);
507 }
508 
509 static const struct file_operations aa_fs_seq_hash_fops = {
510         .owner          = THIS_MODULE,
511         .open           = aa_fs_seq_hash_open,
512         .read           = seq_read,
513         .llseek         = seq_lseek,
514         .release        = single_release,
515 };
516 
517 
518 static int aa_fs_seq_show_ns_level(struct seq_file *seq, void *v)
519 {
520         struct aa_ns *ns = aa_current_profile()->ns;
521 
522         seq_printf(seq, "%d\n", ns->level);
523 
524         return 0;
525 }
526 
527 static int aa_fs_seq_open_ns_level(struct inode *inode, struct file *file)
528 {
529         return single_open(file, aa_fs_seq_show_ns_level, inode->i_private);
530 }
531 
532 static const struct file_operations aa_fs_ns_level = {
533         .owner          = THIS_MODULE,
534         .open           = aa_fs_seq_open_ns_level,
535         .read           = seq_read,
536         .llseek         = seq_lseek,
537         .release        = single_release,
538 };
539 
540 static int aa_fs_seq_show_ns_name(struct seq_file *seq, void *v)
541 {
542         struct aa_ns *ns = aa_current_profile()->ns;
543 
544         seq_printf(seq, "%s\n", ns->base.name);
545 
546         return 0;
547 }
548 
549 static int aa_fs_seq_open_ns_name(struct inode *inode, struct file *file)
550 {
551         return single_open(file, aa_fs_seq_show_ns_name, inode->i_private);
552 }
553 
554 static const struct file_operations aa_fs_ns_name = {
555         .owner          = THIS_MODULE,
556         .open           = aa_fs_seq_open_ns_name,
557         .read           = seq_read,
558         .llseek         = seq_lseek,
559         .release        = single_release,
560 };
561 
562 static int rawdata_release(struct inode *inode, struct file *file)
563 {
564         /* TODO: switch to loaddata when profile switched to symlink */
565         aa_put_loaddata(file->private_data);
566 
567         return 0;
568 }
569 
570 static int aa_fs_seq_raw_abi_show(struct seq_file *seq, void *v)
571 {
572         struct aa_proxy *proxy = seq->private;
573         struct aa_profile *profile = aa_get_profile_rcu(&proxy->profile);
574 
575         if (profile->rawdata->abi) {
576                 seq_printf(seq, "v%d", profile->rawdata->abi);
577                 seq_puts(seq, "\n");
578         }
579         aa_put_profile(profile);
580 
581         return 0;
582 }
583 
584 static int aa_fs_seq_raw_abi_open(struct inode *inode, struct file *file)
585 {
586         return aa_fs_seq_profile_open(inode, file, aa_fs_seq_raw_abi_show);
587 }
588 
589 static const struct file_operations aa_fs_seq_raw_abi_fops = {
590         .owner          = THIS_MODULE,
591         .open           = aa_fs_seq_raw_abi_open,
592         .read           = seq_read,
593         .llseek         = seq_lseek,
594         .release        = aa_fs_seq_profile_release,
595 };
596 
597 static int aa_fs_seq_raw_hash_show(struct seq_file *seq, void *v)
598 {
599         struct aa_proxy *proxy = seq->private;
600         struct aa_profile *profile = aa_get_profile_rcu(&proxy->profile);
601         unsigned int i, size = aa_hash_size();
602 
603         if (profile->rawdata->hash) {
604                 for (i = 0; i < size; i++)
605                         seq_printf(seq, "%.2x", profile->rawdata->hash[i]);
606                 seq_puts(seq, "\n");
607         }
608         aa_put_profile(profile);
609 
610         return 0;
611 }
612 
613 static int aa_fs_seq_raw_hash_open(struct inode *inode, struct file *file)
614 {
615         return aa_fs_seq_profile_open(inode, file, aa_fs_seq_raw_hash_show);
616 }
617 
618 static const struct file_operations aa_fs_seq_raw_hash_fops = {
619         .owner          = THIS_MODULE,
620         .open           = aa_fs_seq_raw_hash_open,
621         .read           = seq_read,
622         .llseek         = seq_lseek,
623         .release        = aa_fs_seq_profile_release,
624 };
625 
626 static ssize_t rawdata_read(struct file *file, char __user *buf, size_t size,
627                             loff_t *ppos)
628 {
629         struct aa_loaddata *rawdata = file->private_data;
630 
631         return simple_read_from_buffer(buf, size, ppos, rawdata->data,
632                                        rawdata->size);
633 }
634 
635 static int rawdata_open(struct inode *inode, struct file *file)
636 {
637         struct aa_proxy *proxy = inode->i_private;
638         struct aa_profile *profile;
639 
640         if (!policy_view_capable(NULL))
641                 return -EACCES;
642         profile = aa_get_profile_rcu(&proxy->profile);
643         file->private_data = aa_get_loaddata(profile->rawdata);
644         aa_put_profile(profile);
645 
646         return 0;
647 }
648 
649 static const struct file_operations aa_fs_rawdata_fops = {
650         .open = rawdata_open,
651         .read = rawdata_read,
652         .llseek = generic_file_llseek,
653         .release = rawdata_release,
654 };
655 
656 /** fns to setup dynamic per profile/namespace files **/
657 void __aa_fs_profile_rmdir(struct aa_profile *profile)
658 {
659         struct aa_profile *child;
660         int i;
661 
662         if (!profile)
663                 return;
664 
665         list_for_each_entry(child, &profile->base.profiles, base.list)
666                 __aa_fs_profile_rmdir(child);
667 
668         for (i = AAFS_PROF_SIZEOF - 1; i >= 0; --i) {
669                 struct aa_proxy *proxy;
670                 if (!profile->dents[i])
671                         continue;
672 
673                 proxy = d_inode(profile->dents[i])->i_private;
674                 securityfs_remove(profile->dents[i]);
675                 aa_put_proxy(proxy);
676                 profile->dents[i] = NULL;
677         }
678 }
679 
680 void __aa_fs_profile_migrate_dents(struct aa_profile *old,
681                                    struct aa_profile *new)
682 {
683         int i;
684 
685         for (i = 0; i < AAFS_PROF_SIZEOF; i++) {
686                 new->dents[i] = old->dents[i];
687                 if (new->dents[i])
688                         new->dents[i]->d_inode->i_mtime = current_time(new->dents[i]->d_inode);
689                 old->dents[i] = NULL;
690         }
691 }
692 
693 static struct dentry *create_profile_file(struct dentry *dir, const char *name,
694                                           struct aa_profile *profile,
695                                           const struct file_operations *fops)
696 {
697         struct aa_proxy *proxy = aa_get_proxy(profile->proxy);
698         struct dentry *dent;
699 
700         dent = securityfs_create_file(name, S_IFREG | 0444, dir, proxy, fops);
701         if (IS_ERR(dent))
702                 aa_put_proxy(proxy);
703 
704         return dent;
705 }
706 
707 /* requires lock be held */
708 int __aa_fs_profile_mkdir(struct aa_profile *profile, struct dentry *parent)
709 {
710         struct aa_profile *child;
711         struct dentry *dent = NULL, *dir;
712         int error;
713 
714         if (!parent) {
715                 struct aa_profile *p;
716                 p = aa_deref_parent(profile);
717                 dent = prof_dir(p);
718                 /* adding to parent that previously didn't have children */
719                 dent = securityfs_create_dir("profiles", dent);
720                 if (IS_ERR(dent))
721                         goto fail;
722                 prof_child_dir(p) = parent = dent;
723         }
724 
725         if (!profile->dirname) {
726                 int len, id_len;
727                 len = mangle_name(profile->base.name, NULL);
728                 id_len = snprintf(NULL, 0, ".%ld", profile->ns->uniq_id);
729 
730                 profile->dirname = kmalloc(len + id_len + 1, GFP_KERNEL);
731                 if (!profile->dirname)
732                         goto fail;
733 
734                 mangle_name(profile->base.name, profile->dirname);
735                 sprintf(profile->dirname + len, ".%ld", profile->ns->uniq_id++);
736         }
737 
738         dent = securityfs_create_dir(profile->dirname, parent);
739         if (IS_ERR(dent))
740                 goto fail;
741         prof_dir(profile) = dir = dent;
742 
743         dent = create_profile_file(dir, "name", profile, &aa_fs_profname_fops);
744         if (IS_ERR(dent))
745                 goto fail;
746         profile->dents[AAFS_PROF_NAME] = dent;
747 
748         dent = create_profile_file(dir, "mode", profile, &aa_fs_profmode_fops);
749         if (IS_ERR(dent))
750                 goto fail;
751         profile->dents[AAFS_PROF_MODE] = dent;
752 
753         dent = create_profile_file(dir, "attach", profile,
754                                    &aa_fs_profattach_fops);
755         if (IS_ERR(dent))
756                 goto fail;
757         profile->dents[AAFS_PROF_ATTACH] = dent;
758 
759         if (profile->hash) {
760                 dent = create_profile_file(dir, "sha1", profile,
761                                            &aa_fs_seq_hash_fops);
762                 if (IS_ERR(dent))
763                         goto fail;
764                 profile->dents[AAFS_PROF_HASH] = dent;
765         }
766 
767         if (profile->rawdata) {
768                 dent = create_profile_file(dir, "raw_sha1", profile,
769                                            &aa_fs_seq_raw_hash_fops);
770                 if (IS_ERR(dent))
771                         goto fail;
772                 profile->dents[AAFS_PROF_RAW_HASH] = dent;
773 
774                 dent = create_profile_file(dir, "raw_abi", profile,
775                                            &aa_fs_seq_raw_abi_fops);
776                 if (IS_ERR(dent))
777                         goto fail;
778                 profile->dents[AAFS_PROF_RAW_ABI] = dent;
779 
780                 dent = securityfs_create_file("raw_data", S_IFREG | 0444, dir,
781                                               profile->proxy,
782                                               &aa_fs_rawdata_fops);
783                 if (IS_ERR(dent))
784                         goto fail;
785                 profile->dents[AAFS_PROF_RAW_DATA] = dent;
786                 d_inode(dent)->i_size = profile->rawdata->size;
787                 aa_get_proxy(profile->proxy);
788         }
789 
790         list_for_each_entry(child, &profile->base.profiles, base.list) {
791                 error = __aa_fs_profile_mkdir(child, prof_child_dir(profile));
792                 if (error)
793                         goto fail2;
794         }
795 
796         return 0;
797 
798 fail:
799         error = PTR_ERR(dent);
800 
801 fail2:
802         __aa_fs_profile_rmdir(profile);
803 
804         return error;
805 }
806 
807 void __aa_fs_ns_rmdir(struct aa_ns *ns)
808 {
809         struct aa_ns *sub;
810         struct aa_profile *child;
811         int i;
812 
813         if (!ns)
814                 return;
815 
816         list_for_each_entry(child, &ns->base.profiles, base.list)
817                 __aa_fs_profile_rmdir(child);
818 
819         list_for_each_entry(sub, &ns->sub_ns, base.list) {
820                 mutex_lock(&sub->lock);
821                 __aa_fs_ns_rmdir(sub);
822                 mutex_unlock(&sub->lock);
823         }
824 
825         if (ns_subns_dir(ns)) {
826                 sub = d_inode(ns_subns_dir(ns))->i_private;
827                 aa_put_ns(sub);
828         }
829         if (ns_subload(ns)) {
830                 sub = d_inode(ns_subload(ns))->i_private;
831                 aa_put_ns(sub);
832         }
833         if (ns_subreplace(ns)) {
834                 sub = d_inode(ns_subreplace(ns))->i_private;
835                 aa_put_ns(sub);
836         }
837         if (ns_subremove(ns)) {
838                 sub = d_inode(ns_subremove(ns))->i_private;
839                 aa_put_ns(sub);
840         }
841 
842         for (i = AAFS_NS_SIZEOF - 1; i >= 0; --i) {
843                 securityfs_remove(ns->dents[i]);
844                 ns->dents[i] = NULL;
845         }
846 }
847 
848 /* assumes cleanup in caller */
849 static int __aa_fs_ns_mkdir_entries(struct aa_ns *ns, struct dentry *dir)
850 {
851         struct dentry *dent;
852 
853         AA_BUG(!ns);
854         AA_BUG(!dir);
855 
856         dent = securityfs_create_dir("profiles", dir);
857         if (IS_ERR(dent))
858                 return PTR_ERR(dent);
859         ns_subprofs_dir(ns) = dent;
860 
861         dent = securityfs_create_dir("raw_data", dir);
862         if (IS_ERR(dent))
863                 return PTR_ERR(dent);
864         ns_subdata_dir(ns) = dent;
865 
866         dent = securityfs_create_file(".load", 0640, dir, ns,
867                                       &aa_fs_profile_load);
868         if (IS_ERR(dent))
869                 return PTR_ERR(dent);
870         aa_get_ns(ns);
871         ns_subload(ns) = dent;
872 
873         dent = securityfs_create_file(".replace", 0640, dir, ns,
874                                       &aa_fs_profile_replace);
875         if (IS_ERR(dent))
876                 return PTR_ERR(dent);
877         aa_get_ns(ns);
878         ns_subreplace(ns) = dent;
879 
880         dent = securityfs_create_file(".remove", 0640, dir, ns,
881                                       &aa_fs_profile_remove);
882         if (IS_ERR(dent))
883                 return PTR_ERR(dent);
884         aa_get_ns(ns);
885         ns_subremove(ns) = dent;
886 
887         dent = securityfs_create_dir("namespaces", dir);
888         if (IS_ERR(dent))
889                 return PTR_ERR(dent);
890         aa_get_ns(ns);
891         ns_subns_dir(ns) = dent;
892 
893         return 0;
894 }
895 
896 int __aa_fs_ns_mkdir(struct aa_ns *ns, struct dentry *parent, const char *name)
897 {
898         struct aa_ns *sub;
899         struct aa_profile *child;
900         struct dentry *dent, *dir;
901         int error;
902 
903         AA_BUG(!ns);
904         AA_BUG(!parent);
905         AA_BUG(!mutex_is_locked(&ns->lock));
906 
907         if (!name)
908                 name = ns->base.name;
909 
910         /* create ns dir if it doesn't already exist */
911         dent = securityfs_create_dir(name, parent);
912         if (IS_ERR(dent))
913                 goto fail;
914 
915         ns_dir(ns) = dir = dent;
916         error = __aa_fs_ns_mkdir_entries(ns, dir);
917         if (error)
918                 goto fail2;
919 
920         /* profiles */
921         list_for_each_entry(child, &ns->base.profiles, base.list) {
922                 error = __aa_fs_profile_mkdir(child, ns_subprofs_dir(ns));
923                 if (error)
924                         goto fail2;
925         }
926 
927         /* subnamespaces */
928         list_for_each_entry(sub, &ns->sub_ns, base.list) {
929                 mutex_lock(&sub->lock);
930                 error = __aa_fs_ns_mkdir(sub, ns_subns_dir(ns), NULL);
931                 mutex_unlock(&sub->lock);
932                 if (error)
933                         goto fail2;
934         }
935 
936         return 0;
937 
938 fail:
939         error = PTR_ERR(dent);
940 
941 fail2:
942         __aa_fs_ns_rmdir(ns);
943 
944         return error;
945 }
946 
947 
948 #define list_entry_is_head(pos, head, member) (&pos->member == (head))
949 
950 /**
951  * __next_ns - find the next namespace to list
952  * @root: root namespace to stop search at (NOT NULL)
953  * @ns: current ns position (NOT NULL)
954  *
955  * Find the next namespace from @ns under @root and handle all locking needed
956  * while switching current namespace.
957  *
958  * Returns: next namespace or NULL if at last namespace under @root
959  * Requires: ns->parent->lock to be held
960  * NOTE: will not unlock root->lock
961  */
962 static struct aa_ns *__next_ns(struct aa_ns *root, struct aa_ns *ns)
963 {
964         struct aa_ns *parent, *next;
965 
966         /* is next namespace a child */
967         if (!list_empty(&ns->sub_ns)) {
968                 next = list_first_entry(&ns->sub_ns, typeof(*ns), base.list);
969                 mutex_lock(&next->lock);
970                 return next;
971         }
972 
973         /* check if the next ns is a sibling, parent, gp, .. */
974         parent = ns->parent;
975         while (ns != root) {
976                 mutex_unlock(&ns->lock);
977                 next = list_next_entry(ns, base.list);
978                 if (!list_entry_is_head(next, &parent->sub_ns, base.list)) {
979                         mutex_lock(&next->lock);
980                         return next;
981                 }
982                 ns = parent;
983                 parent = parent->parent;
984         }
985 
986         return NULL;
987 }
988 
989 /**
990  * __first_profile - find the first profile in a namespace
991  * @root: namespace that is root of profiles being displayed (NOT NULL)
992  * @ns: namespace to start in   (NOT NULL)
993  *
994  * Returns: unrefcounted profile or NULL if no profile
995  * Requires: profile->ns.lock to be held
996  */
997 static struct aa_profile *__first_profile(struct aa_ns *root,
998                                           struct aa_ns *ns)
999 {
1000         for (; ns; ns = __next_ns(root, ns)) {
1001                 if (!list_empty(&ns->base.profiles))
1002                         return list_first_entry(&ns->base.profiles,
1003                                                 struct aa_profile, base.list);
1004         }
1005         return NULL;
1006 }
1007 
1008 /**
1009  * __next_profile - step to the next profile in a profile tree
1010  * @profile: current profile in tree (NOT NULL)
1011  *
1012  * Perform a depth first traversal on the profile tree in a namespace
1013  *
1014  * Returns: next profile or NULL if done
1015  * Requires: profile->ns.lock to be held
1016  */
1017 static struct aa_profile *__next_profile(struct aa_profile *p)
1018 {
1019         struct aa_profile *parent;
1020         struct aa_ns *ns = p->ns;
1021 
1022         /* is next profile a child */
1023         if (!list_empty(&p->base.profiles))
1024                 return list_first_entry(&p->base.profiles, typeof(*p),
1025                                         base.list);
1026 
1027         /* is next profile a sibling, parent sibling, gp, sibling, .. */
1028         parent = rcu_dereference_protected(p->parent,
1029                                            mutex_is_locked(&p->ns->lock));
1030         while (parent) {
1031                 p = list_next_entry(p, base.list);
1032                 if (!list_entry_is_head(p, &parent->base.profiles, base.list))
1033                         return p;
1034                 p = parent;
1035                 parent = rcu_dereference_protected(parent->parent,
1036                                             mutex_is_locked(&parent->ns->lock));
1037         }
1038 
1039         /* is next another profile in the namespace */
1040         p = list_next_entry(p, base.list);
1041         if (!list_entry_is_head(p, &ns->base.profiles, base.list))
1042                 return p;
1043 
1044         return NULL;
1045 }
1046 
1047 /**
1048  * next_profile - step to the next profile in where ever it may be
1049  * @root: root namespace  (NOT NULL)
1050  * @profile: current profile  (NOT NULL)
1051  *
1052  * Returns: next profile or NULL if there isn't one
1053  */
1054 static struct aa_profile *next_profile(struct aa_ns *root,
1055                                        struct aa_profile *profile)
1056 {
1057         struct aa_profile *next = __next_profile(profile);
1058         if (next)
1059                 return next;
1060 
1061         /* finished all profiles in namespace move to next namespace */
1062         return __first_profile(root, __next_ns(root, profile->ns));
1063 }
1064 
1065 /**
1066  * p_start - start a depth first traversal of profile tree
1067  * @f: seq_file to fill
1068  * @pos: current position
1069  *
1070  * Returns: first profile under current namespace or NULL if none found
1071  *
1072  * acquires first ns->lock
1073  */
1074 static void *p_start(struct seq_file *f, loff_t *pos)
1075 {
1076         struct aa_profile *profile = NULL;
1077         struct aa_ns *root = aa_current_profile()->ns;
1078         loff_t l = *pos;
1079         f->private = aa_get_ns(root);
1080 
1081 
1082         /* find the first profile */
1083         mutex_lock(&root->lock);
1084         profile = __first_profile(root, root);
1085 
1086         /* skip to position */
1087         for (; profile && l > 0; l--)
1088                 profile = next_profile(root, profile);
1089 
1090         return profile;
1091 }
1092 
1093 /**
1094  * p_next - read the next profile entry
1095  * @f: seq_file to fill
1096  * @p: profile previously returned
1097  * @pos: current position
1098  *
1099  * Returns: next profile after @p or NULL if none
1100  *
1101  * may acquire/release locks in namespace tree as necessary
1102  */
1103 static void *p_next(struct seq_file *f, void *p, loff_t *pos)
1104 {
1105         struct aa_profile *profile = p;
1106         struct aa_ns *ns = f->private;
1107         (*pos)++;
1108 
1109         return next_profile(ns, profile);
1110 }
1111 
1112 /**
1113  * p_stop - stop depth first traversal
1114  * @f: seq_file we are filling
1115  * @p: the last profile writen
1116  *
1117  * Release all locking done by p_start/p_next on namespace tree
1118  */
1119 static void p_stop(struct seq_file *f, void *p)
1120 {
1121         struct aa_profile *profile = p;
1122         struct aa_ns *root = f->private, *ns;
1123 
1124         if (profile) {
1125                 for (ns = profile->ns; ns && ns != root; ns = ns->parent)
1126                         mutex_unlock(&ns->lock);
1127         }
1128         mutex_unlock(&root->lock);
1129         aa_put_ns(root);
1130 }
1131 
1132 /**
1133  * seq_show_profile - show a profile entry
1134  * @f: seq_file to file
1135  * @p: current position (profile)    (NOT NULL)
1136  *
1137  * Returns: error on failure
1138  */
1139 static int seq_show_profile(struct seq_file *f, void *p)
1140 {
1141         struct aa_profile *profile = (struct aa_profile *)p;
1142         struct aa_ns *root = f->private;
1143 
1144         if (profile->ns != root)
1145                 seq_printf(f, ":%s://", aa_ns_name(root, profile->ns, true));
1146         seq_printf(f, "%s (%s)\n", profile->base.hname,
1147                    aa_profile_mode_names[profile->mode]);
1148 
1149         return 0;
1150 }
1151 
1152 static const struct seq_operations aa_fs_profiles_op = {
1153         .start = p_start,
1154         .next = p_next,
1155         .stop = p_stop,
1156         .show = seq_show_profile,
1157 };
1158 
1159 static int profiles_open(struct inode *inode, struct file *file)
1160 {
1161         if (!policy_view_capable(NULL))
1162                 return -EACCES;
1163 
1164         return seq_open(file, &aa_fs_profiles_op);
1165 }
1166 
1167 static int profiles_release(struct inode *inode, struct file *file)
1168 {
1169         return seq_release(inode, file);
1170 }
1171 
1172 static const struct file_operations aa_fs_profiles_fops = {
1173         .open = profiles_open,
1174         .read = seq_read,
1175         .llseek = seq_lseek,
1176         .release = profiles_release,
1177 };
1178 
1179 
1180 /** Base file system setup **/
1181 static struct aa_fs_entry aa_fs_entry_file[] = {
1182         AA_FS_FILE_STRING("mask", "create read write exec append mmap_exec " \
1183                                   "link lock"),
1184         { }
1185 };
1186 
1187 static struct aa_fs_entry aa_fs_entry_domain[] = {
1188         AA_FS_FILE_BOOLEAN("change_hat",        1),
1189         AA_FS_FILE_BOOLEAN("change_hatv",       1),
1190         AA_FS_FILE_BOOLEAN("change_onexec",     1),
1191         AA_FS_FILE_BOOLEAN("change_profile",    1),
1192         AA_FS_FILE_BOOLEAN("fix_binfmt_elf_mmap",       1),
1193         AA_FS_FILE_STRING("version", "1.2"),
1194         { }
1195 };
1196 
1197 static struct aa_fs_entry aa_fs_entry_versions[] = {
1198         AA_FS_FILE_BOOLEAN("v5",        1),
1199         { }
1200 };
1201 
1202 static struct aa_fs_entry aa_fs_entry_policy[] = {
1203         AA_FS_DIR("versions",                   aa_fs_entry_versions),
1204         AA_FS_FILE_BOOLEAN("set_load",          1),
1205         { }
1206 };
1207 
1208 static struct aa_fs_entry aa_fs_entry_features[] = {
1209         AA_FS_DIR("policy",                     aa_fs_entry_policy),
1210         AA_FS_DIR("domain",                     aa_fs_entry_domain),
1211         AA_FS_DIR("file",                       aa_fs_entry_file),
1212         AA_FS_FILE_U64("capability",            VFS_CAP_FLAGS_MASK),
1213         AA_FS_DIR("rlimit",                     aa_fs_entry_rlimit),
1214         AA_FS_DIR("caps",                       aa_fs_entry_caps),
1215         { }
1216 };
1217 
1218 static struct aa_fs_entry aa_fs_entry_apparmor[] = {
1219         AA_FS_FILE_FOPS(".access", 0640, &aa_fs_access),
1220         AA_FS_FILE_FOPS(".ns_level", 0666, &aa_fs_ns_level),
1221         AA_FS_FILE_FOPS(".ns_name", 0640, &aa_fs_ns_name),
1222         AA_FS_FILE_FOPS("profiles", 0440, &aa_fs_profiles_fops),
1223         AA_FS_DIR("features", aa_fs_entry_features),
1224         { }
1225 };
1226 
1227 static struct aa_fs_entry aa_fs_entry =
1228         AA_FS_DIR("apparmor", aa_fs_entry_apparmor);
1229 
1230 /**
1231  * aafs_create_file - create a file entry in the apparmor securityfs
1232  * @fs_file: aa_fs_entry to build an entry for (NOT NULL)
1233  * @parent: the parent dentry in the securityfs
1234  *
1235  * Use aafs_remove_file to remove entries created with this fn.
1236  */
1237 static int __init aafs_create_file(struct aa_fs_entry *fs_file,
1238                                    struct dentry *parent)
1239 {
1240         int error = 0;
1241 
1242         fs_file->dentry = securityfs_create_file(fs_file->name,
1243                                                  S_IFREG | fs_file->mode,
1244                                                  parent, fs_file,
1245                                                  fs_file->file_ops);
1246         if (IS_ERR(fs_file->dentry)) {
1247                 error = PTR_ERR(fs_file->dentry);
1248                 fs_file->dentry = NULL;
1249         }
1250         return error;
1251 }
1252 
1253 static void __init aafs_remove_dir(struct aa_fs_entry *fs_dir);
1254 /**
1255  * aafs_create_dir - recursively create a directory entry in the securityfs
1256  * @fs_dir: aa_fs_entry (and all child entries) to build (NOT NULL)
1257  * @parent: the parent dentry in the securityfs
1258  *
1259  * Use aafs_remove_dir to remove entries created with this fn.
1260  */
1261 static int __init aafs_create_dir(struct aa_fs_entry *fs_dir,
1262                                   struct dentry *parent)
1263 {
1264         struct aa_fs_entry *fs_file;
1265         struct dentry *dir;
1266         int error;
1267 
1268         dir = securityfs_create_dir(fs_dir->name, parent);
1269         if (IS_ERR(dir))
1270                 return PTR_ERR(dir);
1271         fs_dir->dentry = dir;
1272 
1273         for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) {
1274                 if (fs_file->v_type == AA_FS_TYPE_DIR)
1275                         error = aafs_create_dir(fs_file, fs_dir->dentry);
1276                 else
1277                         error = aafs_create_file(fs_file, fs_dir->dentry);
1278                 if (error)
1279                         goto failed;
1280         }
1281 
1282         return 0;
1283 
1284 failed:
1285         aafs_remove_dir(fs_dir);
1286 
1287         return error;
1288 }
1289 
1290 /**
1291  * aafs_remove_file - drop a single file entry in the apparmor securityfs
1292  * @fs_file: aa_fs_entry to detach from the securityfs (NOT NULL)
1293  */
1294 static void __init aafs_remove_file(struct aa_fs_entry *fs_file)
1295 {
1296         if (!fs_file->dentry)
1297                 return;
1298 
1299         securityfs_remove(fs_file->dentry);
1300         fs_file->dentry = NULL;
1301 }
1302 
1303 /**
1304  * aafs_remove_dir - recursively drop a directory entry from the securityfs
1305  * @fs_dir: aa_fs_entry (and all child entries) to detach (NOT NULL)
1306  */
1307 static void __init aafs_remove_dir(struct aa_fs_entry *fs_dir)
1308 {
1309         struct aa_fs_entry *fs_file;
1310 
1311         for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) {
1312                 if (fs_file->v_type == AA_FS_TYPE_DIR)
1313                         aafs_remove_dir(fs_file);
1314                 else
1315                         aafs_remove_file(fs_file);
1316         }
1317 
1318         aafs_remove_file(fs_dir);
1319 }
1320 
1321 /**
1322  * aa_destroy_aafs - cleanup and free aafs
1323  *
1324  * releases dentries allocated by aa_create_aafs
1325  */
1326 void __init aa_destroy_aafs(void)
1327 {
1328         aafs_remove_dir(&aa_fs_entry);
1329 }
1330 
1331 
1332 #define NULL_FILE_NAME ".null"
1333 struct path aa_null;
1334 
1335 static int aa_mk_null_file(struct dentry *parent)
1336 {
1337         struct vfsmount *mount = NULL;
1338         struct dentry *dentry;
1339         struct inode *inode;
1340         int count = 0;
1341         int error = simple_pin_fs(parent->d_sb->s_type, &mount, &count);
1342 
1343         if (error)
1344                 return error;
1345 
1346         inode_lock(d_inode(parent));
1347         dentry = lookup_one_len(NULL_FILE_NAME, parent, strlen(NULL_FILE_NAME));
1348         if (IS_ERR(dentry)) {
1349                 error = PTR_ERR(dentry);
1350                 goto out;
1351         }
1352         inode = new_inode(parent->d_inode->i_sb);
1353         if (!inode) {
1354                 error = -ENOMEM;
1355                 goto out1;
1356         }
1357 
1358         inode->i_ino = get_next_ino();
1359         inode->i_mode = S_IFCHR | S_IRUGO | S_IWUGO;
1360         inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
1361         init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO,
1362                            MKDEV(MEM_MAJOR, 3));
1363         d_instantiate(dentry, inode);
1364         aa_null.dentry = dget(dentry);
1365         aa_null.mnt = mntget(mount);
1366 
1367         error = 0;
1368 
1369 out1:
1370         dput(dentry);
1371 out:
1372         inode_unlock(d_inode(parent));
1373         simple_release_fs(&mount, &count);
1374         return error;
1375 }
1376 
1377 /**
1378  * aa_create_aafs - create the apparmor security filesystem
1379  *
1380  * dentries created here are released by aa_destroy_aafs
1381  *
1382  * Returns: error on failure
1383  */
1384 static int __init aa_create_aafs(void)
1385 {
1386         struct dentry *dent;
1387         int error;
1388 
1389         if (!apparmor_initialized)
1390                 return 0;
1391 
1392         if (aa_fs_entry.dentry) {
1393                 AA_ERROR("%s: AppArmor securityfs already exists\n", __func__);
1394                 return -EEXIST;
1395         }
1396 
1397         /* Populate fs tree. */
1398         error = aafs_create_dir(&aa_fs_entry, NULL);
1399         if (error)
1400                 goto error;
1401 
1402         dent = securityfs_create_file(".load", 0666, aa_fs_entry.dentry,
1403                                       NULL, &aa_fs_profile_load);
1404         if (IS_ERR(dent)) {
1405                 error = PTR_ERR(dent);
1406                 goto error;
1407         }
1408         ns_subload(root_ns) = dent;
1409 
1410         dent = securityfs_create_file(".replace", 0666, aa_fs_entry.dentry,
1411                                       NULL, &aa_fs_profile_replace);
1412         if (IS_ERR(dent)) {
1413                 error = PTR_ERR(dent);
1414                 goto error;
1415         }
1416         ns_subreplace(root_ns) = dent;
1417 
1418         dent = securityfs_create_file(".remove", 0666, aa_fs_entry.dentry,
1419                                       NULL, &aa_fs_profile_remove);
1420         if (IS_ERR(dent)) {
1421                 error = PTR_ERR(dent);
1422                 goto error;
1423         }
1424         ns_subremove(root_ns) = dent;
1425 
1426         mutex_lock(&root_ns->lock);
1427         error = __aa_fs_ns_mkdir(root_ns, aa_fs_entry.dentry, "policy");
1428         mutex_unlock(&root_ns->lock);
1429 
1430         if (error)
1431                 goto error;
1432 
1433         error = aa_mk_null_file(aa_fs_entry.dentry);
1434         if (error)
1435                 goto error;
1436 
1437         /* TODO: add default profile to apparmorfs */
1438 
1439         /* Report that AppArmor fs is enabled */
1440         aa_info_message("AppArmor Filesystem Enabled");
1441         return 0;
1442 
1443 error:
1444         aa_destroy_aafs();
1445         AA_ERROR("Error creating AppArmor securityfs\n");
1446         return error;
1447 }
1448 
1449 fs_initcall(aa_create_aafs);
1450 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp