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b886d83c | 1 | // SPDX-License-Identifier: GPL-2.0-only |
63e2b423 JJ |
2 | /* |
3 | * AppArmor security module | |
4 | * | |
5 | * This file contains AppArmor /sys/kernel/security/apparmor interface functions | |
6 | * | |
7 | * Copyright (C) 1998-2008 Novell/SUSE | |
8 | * Copyright 2009-2010 Canonical Ltd. | |
63e2b423 JJ |
9 | */ |
10 | ||
0d259f04 | 11 | #include <linux/ctype.h> |
63e2b423 JJ |
12 | #include <linux/security.h> |
13 | #include <linux/vmalloc.h> | |
876979c9 | 14 | #include <linux/init.h> |
63e2b423 JJ |
15 | #include <linux/seq_file.h> |
16 | #include <linux/uaccess.h> | |
a71ada30 | 17 | #include <linux/mount.h> |
63e2b423 | 18 | #include <linux/namei.h> |
e74abcf3 | 19 | #include <linux/capability.h> |
29b3822f | 20 | #include <linux/rcupdate.h> |
a71ada30 | 21 | #include <linux/fs.h> |
b0ecc9da | 22 | #include <linux/fs_context.h> |
d9bf2c26 | 23 | #include <linux/poll.h> |
63c16c3a | 24 | #include <linux/zlib.h> |
a481f4d9 JJ |
25 | #include <uapi/linux/major.h> |
26 | #include <uapi/linux/magic.h> | |
63e2b423 JJ |
27 | |
28 | #include "include/apparmor.h" | |
29 | #include "include/apparmorfs.h" | |
30 | #include "include/audit.h" | |
d8889d49 | 31 | #include "include/cred.h" |
f8eb8a13 | 32 | #include "include/crypto.h" |
cd1dbf76 | 33 | #include "include/ipc.h" |
317d9a05 | 34 | #include "include/label.h" |
63e2b423 | 35 | #include "include/policy.h" |
cff281f6 | 36 | #include "include/policy_ns.h" |
d384b0a1 | 37 | #include "include/resource.h" |
5ac8c355 | 38 | #include "include/policy_unpack.h" |
63e2b423 | 39 | |
c97204ba JJ |
40 | /* |
41 | * The apparmor filesystem interface used for policy load and introspection | |
42 | * The interface is split into two main components based on their function | |
43 | * a securityfs component: | |
44 | * used for static files that are always available, and which allows | |
45 | * userspace to specificy the location of the security filesystem. | |
46 | * | |
47 | * fns and data are prefixed with | |
48 | * aa_sfs_ | |
49 | * | |
50 | * an apparmorfs component: | |
51 | * used loaded policy content and introspection. It is not part of a | |
52 | * regular mounted filesystem and is available only through the magic | |
53 | * policy symlink in the root of the securityfs apparmor/ directory. | |
54 | * Tasks queries will be magically redirected to the correct portion | |
55 | * of the policy tree based on their confinement. | |
56 | * | |
57 | * fns and data are prefixed with | |
58 | * aafs_ | |
59 | * | |
60 | * The aa_fs_ prefix is used to indicate the fn is used by both the | |
61 | * securityfs and apparmorfs filesystems. | |
62 | */ | |
63 | ||
64 | ||
65 | /* | |
66 | * support fns | |
67 | */ | |
68 | ||
63c16c3a CC |
69 | struct rawdata_f_data { |
70 | struct aa_loaddata *loaddata; | |
71 | }; | |
72 | ||
73 | #define RAWDATA_F_DATA_BUF(p) (char *)(p + 1) | |
74 | ||
75 | static void rawdata_f_data_free(struct rawdata_f_data *private) | |
76 | { | |
77 | if (!private) | |
78 | return; | |
79 | ||
80 | aa_put_loaddata(private->loaddata); | |
81 | kvfree(private); | |
82 | } | |
83 | ||
84 | static struct rawdata_f_data *rawdata_f_data_alloc(size_t size) | |
85 | { | |
86 | struct rawdata_f_data *ret; | |
87 | ||
88 | if (size > SIZE_MAX - sizeof(*ret)) | |
89 | return ERR_PTR(-EINVAL); | |
90 | ||
91 | ret = kvzalloc(sizeof(*ret) + size, GFP_KERNEL); | |
92 | if (!ret) | |
93 | return ERR_PTR(-ENOMEM); | |
94 | ||
95 | return ret; | |
96 | } | |
97 | ||
0d259f04 JJ |
98 | /** |
99 | * aa_mangle_name - mangle a profile name to std profile layout form | |
100 | * @name: profile name to mangle (NOT NULL) | |
101 | * @target: buffer to store mangled name, same length as @name (MAYBE NULL) | |
102 | * | |
103 | * Returns: length of mangled name | |
104 | */ | |
bbe4a7c8 | 105 | static int mangle_name(const char *name, char *target) |
0d259f04 JJ |
106 | { |
107 | char *t = target; | |
108 | ||
109 | while (*name == '/' || *name == '.') | |
110 | name++; | |
111 | ||
112 | if (target) { | |
113 | for (; *name; name++) { | |
114 | if (*name == '/') | |
115 | *(t)++ = '.'; | |
116 | else if (isspace(*name)) | |
117 | *(t)++ = '_'; | |
118 | else if (isalnum(*name) || strchr("._-", *name)) | |
119 | *(t)++ = *name; | |
120 | } | |
121 | ||
122 | *t = 0; | |
123 | } else { | |
124 | int len = 0; | |
125 | for (; *name; name++) { | |
126 | if (isalnum(*name) || isspace(*name) || | |
127 | strchr("/._-", *name)) | |
128 | len++; | |
129 | } | |
130 | ||
131 | return len; | |
132 | } | |
133 | ||
134 | return t - target; | |
135 | } | |
136 | ||
a481f4d9 JJ |
137 | |
138 | /* | |
139 | * aafs - core fns and data for the policy tree | |
140 | */ | |
141 | ||
142 | #define AAFS_NAME "apparmorfs" | |
143 | static struct vfsmount *aafs_mnt; | |
144 | static int aafs_count; | |
145 | ||
146 | ||
147 | static int aafs_show_path(struct seq_file *seq, struct dentry *dentry) | |
148 | { | |
a0781209 | 149 | seq_printf(seq, "%s:[%lu]", AAFS_NAME, d_inode(dentry)->i_ino); |
a481f4d9 JJ |
150 | return 0; |
151 | } | |
152 | ||
27afa27d | 153 | static void aafs_free_inode(struct inode *inode) |
a481f4d9 | 154 | { |
a481f4d9 JJ |
155 | if (S_ISLNK(inode->i_mode)) |
156 | kfree(inode->i_link); | |
f51dcd0f AV |
157 | free_inode_nonrcu(inode); |
158 | } | |
159 | ||
a481f4d9 JJ |
160 | static const struct super_operations aafs_super_ops = { |
161 | .statfs = simple_statfs, | |
27afa27d | 162 | .free_inode = aafs_free_inode, |
a481f4d9 JJ |
163 | .show_path = aafs_show_path, |
164 | }; | |
165 | ||
b0ecc9da | 166 | static int apparmorfs_fill_super(struct super_block *sb, struct fs_context *fc) |
a481f4d9 JJ |
167 | { |
168 | static struct tree_descr files[] = { {""} }; | |
169 | int error; | |
170 | ||
171 | error = simple_fill_super(sb, AAFS_MAGIC, files); | |
172 | if (error) | |
173 | return error; | |
174 | sb->s_op = &aafs_super_ops; | |
175 | ||
176 | return 0; | |
177 | } | |
178 | ||
b0ecc9da | 179 | static int apparmorfs_get_tree(struct fs_context *fc) |
a481f4d9 | 180 | { |
b0ecc9da DH |
181 | return get_tree_single(fc, apparmorfs_fill_super); |
182 | } | |
183 | ||
184 | static const struct fs_context_operations apparmorfs_context_ops = { | |
185 | .get_tree = apparmorfs_get_tree, | |
186 | }; | |
187 | ||
188 | static int apparmorfs_init_fs_context(struct fs_context *fc) | |
189 | { | |
190 | fc->ops = &apparmorfs_context_ops; | |
191 | return 0; | |
a481f4d9 JJ |
192 | } |
193 | ||
194 | static struct file_system_type aafs_ops = { | |
195 | .owner = THIS_MODULE, | |
196 | .name = AAFS_NAME, | |
b0ecc9da | 197 | .init_fs_context = apparmorfs_init_fs_context, |
a481f4d9 JJ |
198 | .kill_sb = kill_anon_super, |
199 | }; | |
200 | ||
201 | /** | |
202 | * __aafs_setup_d_inode - basic inode setup for apparmorfs | |
203 | * @dir: parent directory for the dentry | |
204 | * @dentry: dentry we are seting the inode up for | |
205 | * @mode: permissions the file should have | |
206 | * @data: data to store on inode.i_private, available in open() | |
207 | * @link: if symlink, symlink target string | |
208 | * @fops: struct file_operations that should be used | |
209 | * @iops: struct of inode_operations that should be used | |
210 | */ | |
211 | static int __aafs_setup_d_inode(struct inode *dir, struct dentry *dentry, | |
212 | umode_t mode, void *data, char *link, | |
213 | const struct file_operations *fops, | |
214 | const struct inode_operations *iops) | |
215 | { | |
216 | struct inode *inode = new_inode(dir->i_sb); | |
217 | ||
218 | AA_BUG(!dir); | |
219 | AA_BUG(!dentry); | |
220 | ||
221 | if (!inode) | |
222 | return -ENOMEM; | |
223 | ||
224 | inode->i_ino = get_next_ino(); | |
225 | inode->i_mode = mode; | |
226 | inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); | |
227 | inode->i_private = data; | |
228 | if (S_ISDIR(mode)) { | |
229 | inode->i_op = iops ? iops : &simple_dir_inode_operations; | |
230 | inode->i_fop = &simple_dir_operations; | |
231 | inc_nlink(inode); | |
232 | inc_nlink(dir); | |
233 | } else if (S_ISLNK(mode)) { | |
234 | inode->i_op = iops ? iops : &simple_symlink_inode_operations; | |
235 | inode->i_link = link; | |
236 | } else { | |
237 | inode->i_fop = fops; | |
238 | } | |
239 | d_instantiate(dentry, inode); | |
240 | dget(dentry); | |
241 | ||
242 | return 0; | |
243 | } | |
244 | ||
245 | /** | |
246 | * aafs_create - create a dentry in the apparmorfs filesystem | |
247 | * | |
248 | * @name: name of dentry to create | |
249 | * @mode: permissions the file should have | |
250 | * @parent: parent directory for this dentry | |
251 | * @data: data to store on inode.i_private, available in open() | |
252 | * @link: if symlink, symlink target string | |
253 | * @fops: struct file_operations that should be used for | |
254 | * @iops: struct of inode_operations that should be used | |
255 | * | |
256 | * This is the basic "create a xxx" function for apparmorfs. | |
257 | * | |
258 | * Returns a pointer to a dentry if it succeeds, that must be free with | |
259 | * aafs_remove(). Will return ERR_PTR on failure. | |
260 | */ | |
261 | static struct dentry *aafs_create(const char *name, umode_t mode, | |
262 | struct dentry *parent, void *data, void *link, | |
263 | const struct file_operations *fops, | |
264 | const struct inode_operations *iops) | |
265 | { | |
266 | struct dentry *dentry; | |
267 | struct inode *dir; | |
268 | int error; | |
269 | ||
270 | AA_BUG(!name); | |
271 | AA_BUG(!parent); | |
272 | ||
273 | if (!(mode & S_IFMT)) | |
274 | mode = (mode & S_IALLUGO) | S_IFREG; | |
275 | ||
276 | error = simple_pin_fs(&aafs_ops, &aafs_mnt, &aafs_count); | |
277 | if (error) | |
278 | return ERR_PTR(error); | |
279 | ||
280 | dir = d_inode(parent); | |
281 | ||
282 | inode_lock(dir); | |
283 | dentry = lookup_one_len(name, parent, strlen(name)); | |
5d314a81 DC |
284 | if (IS_ERR(dentry)) { |
285 | error = PTR_ERR(dentry); | |
a481f4d9 | 286 | goto fail_lock; |
5d314a81 | 287 | } |
a481f4d9 JJ |
288 | |
289 | if (d_really_is_positive(dentry)) { | |
290 | error = -EEXIST; | |
291 | goto fail_dentry; | |
292 | } | |
293 | ||
294 | error = __aafs_setup_d_inode(dir, dentry, mode, data, link, fops, iops); | |
295 | if (error) | |
296 | goto fail_dentry; | |
297 | inode_unlock(dir); | |
298 | ||
299 | return dentry; | |
300 | ||
301 | fail_dentry: | |
302 | dput(dentry); | |
303 | ||
304 | fail_lock: | |
305 | inode_unlock(dir); | |
306 | simple_release_fs(&aafs_mnt, &aafs_count); | |
307 | ||
308 | return ERR_PTR(error); | |
309 | } | |
310 | ||
311 | /** | |
312 | * aafs_create_file - create a file in the apparmorfs filesystem | |
313 | * | |
314 | * @name: name of dentry to create | |
315 | * @mode: permissions the file should have | |
316 | * @parent: parent directory for this dentry | |
317 | * @data: data to store on inode.i_private, available in open() | |
318 | * @fops: struct file_operations that should be used for | |
319 | * | |
320 | * see aafs_create | |
321 | */ | |
322 | static struct dentry *aafs_create_file(const char *name, umode_t mode, | |
323 | struct dentry *parent, void *data, | |
324 | const struct file_operations *fops) | |
325 | { | |
326 | return aafs_create(name, mode, parent, data, NULL, fops, NULL); | |
327 | } | |
328 | ||
329 | /** | |
330 | * aafs_create_dir - create a directory in the apparmorfs filesystem | |
331 | * | |
332 | * @name: name of dentry to create | |
333 | * @parent: parent directory for this dentry | |
334 | * | |
335 | * see aafs_create | |
336 | */ | |
337 | static struct dentry *aafs_create_dir(const char *name, struct dentry *parent) | |
338 | { | |
339 | return aafs_create(name, S_IFDIR | 0755, parent, NULL, NULL, NULL, | |
340 | NULL); | |
341 | } | |
342 | ||
343 | /** | |
344 | * aafs_create_symlink - create a symlink in the apparmorfs filesystem | |
345 | * @name: name of dentry to create | |
346 | * @parent: parent directory for this dentry | |
347 | * @target: if symlink, symlink target string | |
1180b4c7 | 348 | * @private: private data |
a481f4d9 JJ |
349 | * @iops: struct of inode_operations that should be used |
350 | * | |
351 | * If @target parameter is %NULL, then the @iops parameter needs to be | |
352 | * setup to handle .readlink and .get_link inode_operations. | |
353 | */ | |
354 | static struct dentry *aafs_create_symlink(const char *name, | |
355 | struct dentry *parent, | |
356 | const char *target, | |
1180b4c7 | 357 | void *private, |
a481f4d9 JJ |
358 | const struct inode_operations *iops) |
359 | { | |
360 | struct dentry *dent; | |
361 | char *link = NULL; | |
362 | ||
363 | if (target) { | |
a481f4d9 JJ |
364 | if (!link) |
365 | return ERR_PTR(-ENOMEM); | |
366 | } | |
1180b4c7 | 367 | dent = aafs_create(name, S_IFLNK | 0444, parent, private, link, NULL, |
a481f4d9 JJ |
368 | iops); |
369 | if (IS_ERR(dent)) | |
370 | kfree(link); | |
371 | ||
372 | return dent; | |
373 | } | |
374 | ||
375 | /** | |
376 | * aafs_remove - removes a file or directory from the apparmorfs filesystem | |
377 | * | |
378 | * @dentry: dentry of the file/directory/symlink to removed. | |
379 | */ | |
380 | static void aafs_remove(struct dentry *dentry) | |
381 | { | |
382 | struct inode *dir; | |
383 | ||
384 | if (!dentry || IS_ERR(dentry)) | |
385 | return; | |
386 | ||
387 | dir = d_inode(dentry->d_parent); | |
388 | inode_lock(dir); | |
389 | if (simple_positive(dentry)) { | |
390 | if (d_is_dir(dentry)) | |
391 | simple_rmdir(dir, dentry); | |
392 | else | |
393 | simple_unlink(dir, dentry); | |
201218e4 | 394 | d_delete(dentry); |
a481f4d9 JJ |
395 | dput(dentry); |
396 | } | |
397 | inode_unlock(dir); | |
398 | simple_release_fs(&aafs_mnt, &aafs_count); | |
399 | } | |
400 | ||
401 | ||
402 | /* | |
403 | * aa_fs - policy load/replace/remove | |
404 | */ | |
405 | ||
63e2b423 JJ |
406 | /** |
407 | * aa_simple_write_to_buffer - common routine for getting policy from user | |
63e2b423 | 408 | * @userbuf: user buffer to copy data from (NOT NULL) |
3ed02ada | 409 | * @alloc_size: size of user buffer (REQUIRES: @alloc_size >= @copy_size) |
63e2b423 JJ |
410 | * @copy_size: size of data to copy from user buffer |
411 | * @pos: position write is at in the file (NOT NULL) | |
412 | * | |
413 | * Returns: kernel buffer containing copy of user buffer data or an | |
414 | * ERR_PTR on failure. | |
415 | */ | |
5ef50d01 | 416 | static struct aa_loaddata *aa_simple_write_to_buffer(const char __user *userbuf, |
5ac8c355 JJ |
417 | size_t alloc_size, |
418 | size_t copy_size, | |
419 | loff_t *pos) | |
63e2b423 | 420 | { |
5ac8c355 | 421 | struct aa_loaddata *data; |
63e2b423 | 422 | |
e6bfa25d | 423 | AA_BUG(copy_size > alloc_size); |
3ed02ada | 424 | |
63e2b423 JJ |
425 | if (*pos != 0) |
426 | /* only writes from pos 0, that is complete writes */ | |
427 | return ERR_PTR(-ESPIPE); | |
428 | ||
63e2b423 | 429 | /* freed by caller to simple_write_to_buffer */ |
5d5182ca JJ |
430 | data = aa_loaddata_alloc(alloc_size); |
431 | if (IS_ERR(data)) | |
432 | return data; | |
63e2b423 | 433 | |
5d5182ca | 434 | data->size = copy_size; |
5ac8c355 | 435 | if (copy_from_user(data->data, userbuf, copy_size)) { |
63e2b423 JJ |
436 | kvfree(data); |
437 | return ERR_PTR(-EFAULT); | |
438 | } | |
439 | ||
440 | return data; | |
441 | } | |
442 | ||
18e99f19 | 443 | static ssize_t policy_update(u32 mask, const char __user *buf, size_t size, |
b7fd2c03 | 444 | loff_t *pos, struct aa_ns *ns) |
63e2b423 | 445 | { |
5ac8c355 | 446 | struct aa_loaddata *data; |
637f688d JJ |
447 | struct aa_label *label; |
448 | ssize_t error; | |
cf797c0e | 449 | |
637f688d | 450 | label = begin_current_label_crit_section(); |
cf797c0e | 451 | |
5ac8c355 JJ |
452 | /* high level check about policy management - fine grained in |
453 | * below after unpack | |
454 | */ | |
637f688d | 455 | error = aa_may_manage_policy(label, ns, mask); |
5ac8c355 JJ |
456 | if (error) |
457 | return error; | |
63e2b423 | 458 | |
5ef50d01 | 459 | data = aa_simple_write_to_buffer(buf, size, size, pos); |
63e2b423 JJ |
460 | error = PTR_ERR(data); |
461 | if (!IS_ERR(data)) { | |
637f688d | 462 | error = aa_replace_profiles(ns, label, mask, data); |
5ac8c355 | 463 | aa_put_loaddata(data); |
63e2b423 | 464 | } |
637f688d | 465 | end_current_label_crit_section(label); |
63e2b423 JJ |
466 | |
467 | return error; | |
468 | } | |
469 | ||
b7fd2c03 | 470 | /* .load file hook fn to load policy */ |
5ac8c355 JJ |
471 | static ssize_t profile_load(struct file *f, const char __user *buf, size_t size, |
472 | loff_t *pos) | |
473 | { | |
b7fd2c03 | 474 | struct aa_ns *ns = aa_get_ns(f->f_inode->i_private); |
18e99f19 | 475 | int error = policy_update(AA_MAY_LOAD_POLICY, buf, size, pos, ns); |
b7fd2c03 JJ |
476 | |
477 | aa_put_ns(ns); | |
5ac8c355 JJ |
478 | |
479 | return error; | |
480 | } | |
481 | ||
63e2b423 | 482 | static const struct file_operations aa_fs_profile_load = { |
6038f373 AB |
483 | .write = profile_load, |
484 | .llseek = default_llseek, | |
63e2b423 JJ |
485 | }; |
486 | ||
487 | /* .replace file hook fn to load and/or replace policy */ | |
488 | static ssize_t profile_replace(struct file *f, const char __user *buf, | |
489 | size_t size, loff_t *pos) | |
490 | { | |
b7fd2c03 | 491 | struct aa_ns *ns = aa_get_ns(f->f_inode->i_private); |
18e99f19 JJ |
492 | int error = policy_update(AA_MAY_LOAD_POLICY | AA_MAY_REPLACE_POLICY, |
493 | buf, size, pos, ns); | |
b7fd2c03 | 494 | aa_put_ns(ns); |
63e2b423 JJ |
495 | |
496 | return error; | |
497 | } | |
498 | ||
499 | static const struct file_operations aa_fs_profile_replace = { | |
6038f373 AB |
500 | .write = profile_replace, |
501 | .llseek = default_llseek, | |
63e2b423 JJ |
502 | }; |
503 | ||
b7fd2c03 | 504 | /* .remove file hook fn to remove loaded policy */ |
63e2b423 JJ |
505 | static ssize_t profile_remove(struct file *f, const char __user *buf, |
506 | size_t size, loff_t *pos) | |
507 | { | |
5ac8c355 | 508 | struct aa_loaddata *data; |
637f688d | 509 | struct aa_label *label; |
63e2b423 | 510 | ssize_t error; |
b7fd2c03 | 511 | struct aa_ns *ns = aa_get_ns(f->f_inode->i_private); |
63e2b423 | 512 | |
637f688d | 513 | label = begin_current_label_crit_section(); |
5ac8c355 JJ |
514 | /* high level check about policy management - fine grained in |
515 | * below after unpack | |
516 | */ | |
637f688d | 517 | error = aa_may_manage_policy(label, ns, AA_MAY_REMOVE_POLICY); |
5ac8c355 JJ |
518 | if (error) |
519 | goto out; | |
520 | ||
63e2b423 JJ |
521 | /* |
522 | * aa_remove_profile needs a null terminated string so 1 extra | |
523 | * byte is allocated and the copied data is null terminated. | |
524 | */ | |
5ef50d01 | 525 | data = aa_simple_write_to_buffer(buf, size + 1, size, pos); |
63e2b423 JJ |
526 | |
527 | error = PTR_ERR(data); | |
528 | if (!IS_ERR(data)) { | |
5ac8c355 | 529 | data->data[size] = 0; |
637f688d | 530 | error = aa_remove_profiles(ns, label, data->data, size); |
5ac8c355 | 531 | aa_put_loaddata(data); |
63e2b423 | 532 | } |
5ac8c355 | 533 | out: |
637f688d | 534 | end_current_label_crit_section(label); |
b7fd2c03 | 535 | aa_put_ns(ns); |
63e2b423 JJ |
536 | return error; |
537 | } | |
538 | ||
539 | static const struct file_operations aa_fs_profile_remove = { | |
6038f373 AB |
540 | .write = profile_remove, |
541 | .llseek = default_llseek, | |
63e2b423 JJ |
542 | }; |
543 | ||
d9bf2c26 JJ |
544 | struct aa_revision { |
545 | struct aa_ns *ns; | |
546 | long last_read; | |
547 | }; | |
548 | ||
549 | /* revision file hook fn for policy loads */ | |
550 | static int ns_revision_release(struct inode *inode, struct file *file) | |
551 | { | |
552 | struct aa_revision *rev = file->private_data; | |
553 | ||
554 | if (rev) { | |
555 | aa_put_ns(rev->ns); | |
556 | kfree(rev); | |
557 | } | |
558 | ||
559 | return 0; | |
560 | } | |
561 | ||
562 | static ssize_t ns_revision_read(struct file *file, char __user *buf, | |
563 | size_t size, loff_t *ppos) | |
564 | { | |
565 | struct aa_revision *rev = file->private_data; | |
566 | char buffer[32]; | |
567 | long last_read; | |
568 | int avail; | |
569 | ||
feb3c766 | 570 | mutex_lock_nested(&rev->ns->lock, rev->ns->level); |
d9bf2c26 JJ |
571 | last_read = rev->last_read; |
572 | if (last_read == rev->ns->revision) { | |
573 | mutex_unlock(&rev->ns->lock); | |
574 | if (file->f_flags & O_NONBLOCK) | |
575 | return -EAGAIN; | |
576 | if (wait_event_interruptible(rev->ns->wait, | |
577 | last_read != | |
578 | READ_ONCE(rev->ns->revision))) | |
579 | return -ERESTARTSYS; | |
feb3c766 | 580 | mutex_lock_nested(&rev->ns->lock, rev->ns->level); |
d9bf2c26 JJ |
581 | } |
582 | ||
583 | avail = sprintf(buffer, "%ld\n", rev->ns->revision); | |
584 | if (*ppos + size > avail) { | |
585 | rev->last_read = rev->ns->revision; | |
586 | *ppos = 0; | |
587 | } | |
588 | mutex_unlock(&rev->ns->lock); | |
589 | ||
590 | return simple_read_from_buffer(buf, size, ppos, buffer, avail); | |
591 | } | |
592 | ||
593 | static int ns_revision_open(struct inode *inode, struct file *file) | |
594 | { | |
595 | struct aa_revision *rev = kzalloc(sizeof(*rev), GFP_KERNEL); | |
596 | ||
597 | if (!rev) | |
598 | return -ENOMEM; | |
599 | ||
600 | rev->ns = aa_get_ns(inode->i_private); | |
601 | if (!rev->ns) | |
602 | rev->ns = aa_get_current_ns(); | |
603 | file->private_data = rev; | |
604 | ||
605 | return 0; | |
606 | } | |
607 | ||
e6c5a7d9 | 608 | static __poll_t ns_revision_poll(struct file *file, poll_table *pt) |
d9bf2c26 JJ |
609 | { |
610 | struct aa_revision *rev = file->private_data; | |
e6c5a7d9 | 611 | __poll_t mask = 0; |
d9bf2c26 JJ |
612 | |
613 | if (rev) { | |
feb3c766 | 614 | mutex_lock_nested(&rev->ns->lock, rev->ns->level); |
d9bf2c26 JJ |
615 | poll_wait(file, &rev->ns->wait, pt); |
616 | if (rev->last_read < rev->ns->revision) | |
a9a08845 | 617 | mask |= EPOLLIN | EPOLLRDNORM; |
d9bf2c26 JJ |
618 | mutex_unlock(&rev->ns->lock); |
619 | } | |
620 | ||
621 | return mask; | |
622 | } | |
623 | ||
5d5182ca JJ |
624 | void __aa_bump_ns_revision(struct aa_ns *ns) |
625 | { | |
8c62ed27 | 626 | WRITE_ONCE(ns->revision, ns->revision + 1); |
d9bf2c26 | 627 | wake_up_interruptible(&ns->wait); |
5d5182ca JJ |
628 | } |
629 | ||
d9bf2c26 JJ |
630 | static const struct file_operations aa_fs_ns_revision_fops = { |
631 | .owner = THIS_MODULE, | |
632 | .open = ns_revision_open, | |
633 | .poll = ns_revision_poll, | |
634 | .read = ns_revision_read, | |
635 | .llseek = generic_file_llseek, | |
636 | .release = ns_revision_release, | |
637 | }; | |
638 | ||
4f3b3f2d JJ |
639 | static void profile_query_cb(struct aa_profile *profile, struct aa_perms *perms, |
640 | const char *match_str, size_t match_len) | |
641 | { | |
f4585bc2 | 642 | struct aa_perms tmp = { }; |
4f3b3f2d JJ |
643 | struct aa_dfa *dfa; |
644 | unsigned int state = 0; | |
645 | ||
637f688d | 646 | if (profile_unconfined(profile)) |
4f3b3f2d JJ |
647 | return; |
648 | if (profile->file.dfa && *match_str == AA_CLASS_FILE) { | |
649 | dfa = profile->file.dfa; | |
650 | state = aa_dfa_match_len(dfa, profile->file.start, | |
651 | match_str + 1, match_len - 1); | |
4f3b3f2d JJ |
652 | if (state) { |
653 | struct path_cond cond = { }; | |
654 | ||
655 | tmp = aa_compute_fperms(dfa, state, &cond); | |
656 | } | |
657 | } else if (profile->policy.dfa) { | |
b9590ad4 | 658 | if (!PROFILE_MEDIATES(profile, *match_str)) |
4f3b3f2d JJ |
659 | return; /* no change to current perms */ |
660 | dfa = profile->policy.dfa; | |
661 | state = aa_dfa_match_len(dfa, profile->policy.start[0], | |
662 | match_str, match_len); | |
663 | if (state) | |
664 | aa_compute_perms(dfa, state, &tmp); | |
4f3b3f2d JJ |
665 | } |
666 | aa_apply_modes_to_perms(profile, &tmp); | |
317d9a05 | 667 | aa_perms_accum_raw(perms, &tmp); |
4f3b3f2d JJ |
668 | } |
669 | ||
670 | ||
e025be0f WH |
671 | /** |
672 | * query_data - queries a policy and writes its data to buf | |
673 | * @buf: the resulting data is stored here (NOT NULL) | |
674 | * @buf_len: size of buf | |
675 | * @query: query string used to retrieve data | |
676 | * @query_len: size of query including second NUL byte | |
677 | * | |
678 | * The buffers pointed to by buf and query may overlap. The query buffer is | |
679 | * parsed before buf is written to. | |
680 | * | |
681 | * The query should look like "<LABEL>\0<KEY>\0", where <LABEL> is the name of | |
682 | * the security confinement context and <KEY> is the name of the data to | |
683 | * retrieve. <LABEL> and <KEY> must not be NUL-terminated. | |
684 | * | |
685 | * Don't expect the contents of buf to be preserved on failure. | |
686 | * | |
687 | * Returns: number of characters written to buf or -errno on failure | |
688 | */ | |
689 | static ssize_t query_data(char *buf, size_t buf_len, | |
690 | char *query, size_t query_len) | |
691 | { | |
692 | char *out; | |
693 | const char *key; | |
317d9a05 | 694 | struct label_it i; |
637f688d | 695 | struct aa_label *label, *curr; |
317d9a05 | 696 | struct aa_profile *profile; |
e025be0f WH |
697 | struct aa_data *data; |
698 | u32 bytes, blocks; | |
699 | __le32 outle32; | |
700 | ||
701 | if (!query_len) | |
702 | return -EINVAL; /* need a query */ | |
703 | ||
704 | key = query + strnlen(query, query_len) + 1; | |
705 | if (key + 1 >= query + query_len) | |
706 | return -EINVAL; /* not enough space for a non-empty key */ | |
707 | if (key + strnlen(key, query + query_len - key) >= query + query_len) | |
708 | return -EINVAL; /* must end with NUL */ | |
709 | ||
710 | if (buf_len < sizeof(bytes) + sizeof(blocks)) | |
711 | return -EINVAL; /* not enough space */ | |
712 | ||
637f688d JJ |
713 | curr = begin_current_label_crit_section(); |
714 | label = aa_label_parse(curr, query, GFP_KERNEL, false, false); | |
715 | end_current_label_crit_section(curr); | |
716 | if (IS_ERR(label)) | |
717 | return PTR_ERR(label); | |
e025be0f WH |
718 | |
719 | /* We are going to leave space for two numbers. The first is the total | |
720 | * number of bytes we are writing after the first number. This is so | |
721 | * users can read the full output without reallocation. | |
722 | * | |
723 | * The second number is the number of data blocks we're writing. An | |
724 | * application might be confined by multiple policies having data in | |
725 | * the same key. | |
726 | */ | |
727 | memset(buf, 0, sizeof(bytes) + sizeof(blocks)); | |
728 | out = buf + sizeof(bytes) + sizeof(blocks); | |
729 | ||
730 | blocks = 0; | |
317d9a05 JJ |
731 | label_for_each_confined(i, label, profile) { |
732 | if (!profile->data) | |
733 | continue; | |
734 | ||
735 | data = rhashtable_lookup_fast(profile->data, &key, | |
736 | profile->data->p); | |
e025be0f WH |
737 | |
738 | if (data) { | |
317d9a05 JJ |
739 | if (out + sizeof(outle32) + data->size > buf + |
740 | buf_len) { | |
637f688d | 741 | aa_put_label(label); |
e025be0f | 742 | return -EINVAL; /* not enough space */ |
637f688d | 743 | } |
e025be0f WH |
744 | outle32 = __cpu_to_le32(data->size); |
745 | memcpy(out, &outle32, sizeof(outle32)); | |
746 | out += sizeof(outle32); | |
747 | memcpy(out, data->data, data->size); | |
748 | out += data->size; | |
749 | blocks++; | |
750 | } | |
751 | } | |
637f688d | 752 | aa_put_label(label); |
e025be0f WH |
753 | |
754 | outle32 = __cpu_to_le32(out - buf - sizeof(bytes)); | |
755 | memcpy(buf, &outle32, sizeof(outle32)); | |
756 | outle32 = __cpu_to_le32(blocks); | |
757 | memcpy(buf + sizeof(bytes), &outle32, sizeof(outle32)); | |
758 | ||
759 | return out - buf; | |
760 | } | |
761 | ||
4f3b3f2d JJ |
762 | /** |
763 | * query_label - queries a label and writes permissions to buf | |
764 | * @buf: the resulting permissions string is stored here (NOT NULL) | |
765 | * @buf_len: size of buf | |
766 | * @query: binary query string to match against the dfa | |
767 | * @query_len: size of query | |
768 | * @view_only: only compute for querier's view | |
769 | * | |
770 | * The buffers pointed to by buf and query may overlap. The query buffer is | |
771 | * parsed before buf is written to. | |
772 | * | |
773 | * The query should look like "LABEL_NAME\0DFA_STRING" where LABEL_NAME is | |
774 | * the name of the label, in the current namespace, that is to be queried and | |
775 | * DFA_STRING is a binary string to match against the label(s)'s DFA. | |
776 | * | |
777 | * LABEL_NAME must be NUL terminated. DFA_STRING may contain NUL characters | |
778 | * but must *not* be NUL terminated. | |
779 | * | |
780 | * Returns: number of characters written to buf or -errno on failure | |
781 | */ | |
782 | static ssize_t query_label(char *buf, size_t buf_len, | |
783 | char *query, size_t query_len, bool view_only) | |
784 | { | |
317d9a05 | 785 | struct aa_profile *profile; |
637f688d | 786 | struct aa_label *label, *curr; |
4f3b3f2d JJ |
787 | char *label_name, *match_str; |
788 | size_t label_name_len, match_len; | |
789 | struct aa_perms perms; | |
317d9a05 | 790 | struct label_it i; |
4f3b3f2d JJ |
791 | |
792 | if (!query_len) | |
793 | return -EINVAL; | |
794 | ||
795 | label_name = query; | |
796 | label_name_len = strnlen(query, query_len); | |
797 | if (!label_name_len || label_name_len == query_len) | |
798 | return -EINVAL; | |
799 | ||
800 | /** | |
801 | * The extra byte is to account for the null byte between the | |
802 | * profile name and dfa string. profile_name_len is greater | |
803 | * than zero and less than query_len, so a byte can be safely | |
804 | * added or subtracted. | |
805 | */ | |
806 | match_str = label_name + label_name_len + 1; | |
807 | match_len = query_len - label_name_len - 1; | |
808 | ||
637f688d JJ |
809 | curr = begin_current_label_crit_section(); |
810 | label = aa_label_parse(curr, label_name, GFP_KERNEL, false, false); | |
811 | end_current_label_crit_section(curr); | |
812 | if (IS_ERR(label)) | |
813 | return PTR_ERR(label); | |
4f3b3f2d JJ |
814 | |
815 | perms = allperms; | |
317d9a05 JJ |
816 | if (view_only) { |
817 | label_for_each_in_ns(i, labels_ns(label), label, profile) { | |
818 | profile_query_cb(profile, &perms, match_str, match_len); | |
819 | } | |
820 | } else { | |
821 | label_for_each(i, label, profile) { | |
822 | profile_query_cb(profile, &perms, match_str, match_len); | |
823 | } | |
824 | } | |
825 | aa_put_label(label); | |
4f3b3f2d JJ |
826 | |
827 | return scnprintf(buf, buf_len, | |
828 | "allow 0x%08x\ndeny 0x%08x\naudit 0x%08x\nquiet 0x%08x\n", | |
829 | perms.allow, perms.deny, perms.audit, perms.quiet); | |
830 | } | |
831 | ||
1dea3b41 JJ |
832 | /* |
833 | * Transaction based IO. | |
834 | * The file expects a write which triggers the transaction, and then | |
835 | * possibly a read(s) which collects the result - which is stored in a | |
836 | * file-local buffer. Once a new write is performed, a new set of results | |
837 | * are stored in the file-local buffer. | |
838 | */ | |
839 | struct multi_transaction { | |
840 | struct kref count; | |
841 | ssize_t size; | |
842 | char data[0]; | |
843 | }; | |
844 | ||
845 | #define MULTI_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct multi_transaction)) | |
846 | /* TODO: replace with per file lock */ | |
847 | static DEFINE_SPINLOCK(multi_transaction_lock); | |
848 | ||
849 | static void multi_transaction_kref(struct kref *kref) | |
850 | { | |
851 | struct multi_transaction *t; | |
852 | ||
853 | t = container_of(kref, struct multi_transaction, count); | |
854 | free_page((unsigned long) t); | |
855 | } | |
856 | ||
857 | static struct multi_transaction * | |
858 | get_multi_transaction(struct multi_transaction *t) | |
859 | { | |
860 | if (t) | |
861 | kref_get(&(t->count)); | |
862 | ||
863 | return t; | |
864 | } | |
865 | ||
866 | static void put_multi_transaction(struct multi_transaction *t) | |
867 | { | |
868 | if (t) | |
869 | kref_put(&(t->count), multi_transaction_kref); | |
870 | } | |
871 | ||
872 | /* does not increment @new's count */ | |
873 | static void multi_transaction_set(struct file *file, | |
874 | struct multi_transaction *new, size_t n) | |
875 | { | |
876 | struct multi_transaction *old; | |
877 | ||
878 | AA_BUG(n > MULTI_TRANSACTION_LIMIT); | |
879 | ||
880 | new->size = n; | |
881 | spin_lock(&multi_transaction_lock); | |
882 | old = (struct multi_transaction *) file->private_data; | |
883 | file->private_data = new; | |
884 | spin_unlock(&multi_transaction_lock); | |
885 | put_multi_transaction(old); | |
886 | } | |
887 | ||
888 | static struct multi_transaction *multi_transaction_new(struct file *file, | |
889 | const char __user *buf, | |
890 | size_t size) | |
891 | { | |
892 | struct multi_transaction *t; | |
893 | ||
894 | if (size > MULTI_TRANSACTION_LIMIT - 1) | |
895 | return ERR_PTR(-EFBIG); | |
896 | ||
897 | t = (struct multi_transaction *)get_zeroed_page(GFP_KERNEL); | |
898 | if (!t) | |
899 | return ERR_PTR(-ENOMEM); | |
900 | kref_init(&t->count); | |
901 | if (copy_from_user(t->data, buf, size)) | |
902 | return ERR_PTR(-EFAULT); | |
903 | ||
904 | return t; | |
905 | } | |
906 | ||
907 | static ssize_t multi_transaction_read(struct file *file, char __user *buf, | |
908 | size_t size, loff_t *pos) | |
909 | { | |
910 | struct multi_transaction *t; | |
911 | ssize_t ret; | |
912 | ||
913 | spin_lock(&multi_transaction_lock); | |
914 | t = get_multi_transaction(file->private_data); | |
915 | spin_unlock(&multi_transaction_lock); | |
916 | if (!t) | |
917 | return 0; | |
918 | ||
919 | ret = simple_read_from_buffer(buf, size, pos, t->data, t->size); | |
920 | put_multi_transaction(t); | |
921 | ||
922 | return ret; | |
923 | } | |
924 | ||
925 | static int multi_transaction_release(struct inode *inode, struct file *file) | |
926 | { | |
927 | put_multi_transaction(file->private_data); | |
928 | ||
929 | return 0; | |
930 | } | |
931 | ||
317d9a05 JJ |
932 | #define QUERY_CMD_LABEL "label\0" |
933 | #define QUERY_CMD_LABEL_LEN 6 | |
4f3b3f2d JJ |
934 | #define QUERY_CMD_PROFILE "profile\0" |
935 | #define QUERY_CMD_PROFILE_LEN 8 | |
317d9a05 JJ |
936 | #define QUERY_CMD_LABELALL "labelall\0" |
937 | #define QUERY_CMD_LABELALL_LEN 9 | |
e025be0f WH |
938 | #define QUERY_CMD_DATA "data\0" |
939 | #define QUERY_CMD_DATA_LEN 5 | |
940 | ||
941 | /** | |
942 | * aa_write_access - generic permissions and data query | |
943 | * @file: pointer to open apparmorfs/access file | |
944 | * @ubuf: user buffer containing the complete query string (NOT NULL) | |
945 | * @count: size of ubuf | |
946 | * @ppos: position in the file (MUST BE ZERO) | |
947 | * | |
948 | * Allows for one permissions or data query per open(), write(), and read() | |
949 | * sequence. The only queries currently supported are label-based queries for | |
950 | * permissions or data. | |
951 | * | |
952 | * For permissions queries, ubuf must begin with "label\0", followed by the | |
953 | * profile query specific format described in the query_label() function | |
954 | * documentation. | |
955 | * | |
956 | * For data queries, ubuf must have the form "data\0<LABEL>\0<KEY>\0", where | |
957 | * <LABEL> is the name of the security confinement context and <KEY> is the | |
958 | * name of the data to retrieve. | |
959 | * | |
960 | * Returns: number of bytes written or -errno on failure | |
961 | */ | |
962 | static ssize_t aa_write_access(struct file *file, const char __user *ubuf, | |
963 | size_t count, loff_t *ppos) | |
964 | { | |
1dea3b41 | 965 | struct multi_transaction *t; |
e025be0f WH |
966 | ssize_t len; |
967 | ||
968 | if (*ppos) | |
969 | return -ESPIPE; | |
970 | ||
1dea3b41 JJ |
971 | t = multi_transaction_new(file, ubuf, count); |
972 | if (IS_ERR(t)) | |
973 | return PTR_ERR(t); | |
e025be0f | 974 | |
4f3b3f2d JJ |
975 | if (count > QUERY_CMD_PROFILE_LEN && |
976 | !memcmp(t->data, QUERY_CMD_PROFILE, QUERY_CMD_PROFILE_LEN)) { | |
977 | len = query_label(t->data, MULTI_TRANSACTION_LIMIT, | |
978 | t->data + QUERY_CMD_PROFILE_LEN, | |
979 | count - QUERY_CMD_PROFILE_LEN, true); | |
317d9a05 JJ |
980 | } else if (count > QUERY_CMD_LABEL_LEN && |
981 | !memcmp(t->data, QUERY_CMD_LABEL, QUERY_CMD_LABEL_LEN)) { | |
982 | len = query_label(t->data, MULTI_TRANSACTION_LIMIT, | |
983 | t->data + QUERY_CMD_LABEL_LEN, | |
984 | count - QUERY_CMD_LABEL_LEN, true); | |
985 | } else if (count > QUERY_CMD_LABELALL_LEN && | |
986 | !memcmp(t->data, QUERY_CMD_LABELALL, | |
987 | QUERY_CMD_LABELALL_LEN)) { | |
988 | len = query_label(t->data, MULTI_TRANSACTION_LIMIT, | |
989 | t->data + QUERY_CMD_LABELALL_LEN, | |
990 | count - QUERY_CMD_LABELALL_LEN, false); | |
4f3b3f2d | 991 | } else if (count > QUERY_CMD_DATA_LEN && |
1dea3b41 JJ |
992 | !memcmp(t->data, QUERY_CMD_DATA, QUERY_CMD_DATA_LEN)) { |
993 | len = query_data(t->data, MULTI_TRANSACTION_LIMIT, | |
994 | t->data + QUERY_CMD_DATA_LEN, | |
e025be0f WH |
995 | count - QUERY_CMD_DATA_LEN); |
996 | } else | |
997 | len = -EINVAL; | |
998 | ||
1dea3b41 JJ |
999 | if (len < 0) { |
1000 | put_multi_transaction(t); | |
e025be0f | 1001 | return len; |
1dea3b41 | 1002 | } |
e025be0f | 1003 | |
1dea3b41 | 1004 | multi_transaction_set(file, t, len); |
e025be0f WH |
1005 | |
1006 | return count; | |
1007 | } | |
1008 | ||
c97204ba | 1009 | static const struct file_operations aa_sfs_access = { |
e025be0f | 1010 | .write = aa_write_access, |
1dea3b41 JJ |
1011 | .read = multi_transaction_read, |
1012 | .release = multi_transaction_release, | |
e025be0f WH |
1013 | .llseek = generic_file_llseek, |
1014 | }; | |
1015 | ||
c97204ba | 1016 | static int aa_sfs_seq_show(struct seq_file *seq, void *v) |
e74abcf3 | 1017 | { |
c97204ba | 1018 | struct aa_sfs_entry *fs_file = seq->private; |
e74abcf3 KC |
1019 | |
1020 | if (!fs_file) | |
1021 | return 0; | |
1022 | ||
1023 | switch (fs_file->v_type) { | |
c97204ba | 1024 | case AA_SFS_TYPE_BOOLEAN: |
e74abcf3 KC |
1025 | seq_printf(seq, "%s\n", fs_file->v.boolean ? "yes" : "no"); |
1026 | break; | |
c97204ba | 1027 | case AA_SFS_TYPE_STRING: |
a9bf8e9f KC |
1028 | seq_printf(seq, "%s\n", fs_file->v.string); |
1029 | break; | |
c97204ba | 1030 | case AA_SFS_TYPE_U64: |
e74abcf3 KC |
1031 | seq_printf(seq, "%#08lx\n", fs_file->v.u64); |
1032 | break; | |
1033 | default: | |
1034 | /* Ignore unpritable entry types. */ | |
1035 | break; | |
1036 | } | |
1037 | ||
1038 | return 0; | |
1039 | } | |
1040 | ||
c97204ba | 1041 | static int aa_sfs_seq_open(struct inode *inode, struct file *file) |
e74abcf3 | 1042 | { |
c97204ba | 1043 | return single_open(file, aa_sfs_seq_show, inode->i_private); |
e74abcf3 KC |
1044 | } |
1045 | ||
c97204ba | 1046 | const struct file_operations aa_sfs_seq_file_ops = { |
e74abcf3 | 1047 | .owner = THIS_MODULE, |
c97204ba | 1048 | .open = aa_sfs_seq_open, |
e74abcf3 KC |
1049 | .read = seq_read, |
1050 | .llseek = seq_lseek, | |
1051 | .release = single_release, | |
1052 | }; | |
1053 | ||
52b97de3 JJ |
1054 | /* |
1055 | * profile based file operations | |
1056 | * policy/profiles/XXXX/profiles/ * | |
1057 | */ | |
1058 | ||
1059 | #define SEQ_PROFILE_FOPS(NAME) \ | |
1060 | static int seq_profile_ ##NAME ##_open(struct inode *inode, struct file *file)\ | |
1061 | { \ | |
1062 | return seq_profile_open(inode, file, seq_profile_ ##NAME ##_show); \ | |
1063 | } \ | |
1064 | \ | |
1065 | static const struct file_operations seq_profile_ ##NAME ##_fops = { \ | |
1066 | .owner = THIS_MODULE, \ | |
1067 | .open = seq_profile_ ##NAME ##_open, \ | |
1068 | .read = seq_read, \ | |
1069 | .llseek = seq_lseek, \ | |
1070 | .release = seq_profile_release, \ | |
1071 | } \ | |
1072 | ||
1073 | static int seq_profile_open(struct inode *inode, struct file *file, | |
1074 | int (*show)(struct seq_file *, void *)) | |
0d259f04 | 1075 | { |
8399588a JJ |
1076 | struct aa_proxy *proxy = aa_get_proxy(inode->i_private); |
1077 | int error = single_open(file, show, proxy); | |
0d259f04 JJ |
1078 | |
1079 | if (error) { | |
1080 | file->private_data = NULL; | |
8399588a | 1081 | aa_put_proxy(proxy); |
0d259f04 JJ |
1082 | } |
1083 | ||
1084 | return error; | |
1085 | } | |
1086 | ||
52b97de3 | 1087 | static int seq_profile_release(struct inode *inode, struct file *file) |
0d259f04 JJ |
1088 | { |
1089 | struct seq_file *seq = (struct seq_file *) file->private_data; | |
1090 | if (seq) | |
8399588a | 1091 | aa_put_proxy(seq->private); |
0d259f04 JJ |
1092 | return single_release(inode, file); |
1093 | } | |
1094 | ||
52b97de3 | 1095 | static int seq_profile_name_show(struct seq_file *seq, void *v) |
0d259f04 | 1096 | { |
8399588a | 1097 | struct aa_proxy *proxy = seq->private; |
637f688d JJ |
1098 | struct aa_label *label = aa_get_label_rcu(&proxy->label); |
1099 | struct aa_profile *profile = labels_profile(label); | |
0d259f04 | 1100 | seq_printf(seq, "%s\n", profile->base.name); |
637f688d | 1101 | aa_put_label(label); |
0d259f04 JJ |
1102 | |
1103 | return 0; | |
1104 | } | |
1105 | ||
52b97de3 | 1106 | static int seq_profile_mode_show(struct seq_file *seq, void *v) |
0d259f04 | 1107 | { |
8399588a | 1108 | struct aa_proxy *proxy = seq->private; |
637f688d JJ |
1109 | struct aa_label *label = aa_get_label_rcu(&proxy->label); |
1110 | struct aa_profile *profile = labels_profile(label); | |
0d259f04 | 1111 | seq_printf(seq, "%s\n", aa_profile_mode_names[profile->mode]); |
637f688d | 1112 | aa_put_label(label); |
0d259f04 JJ |
1113 | |
1114 | return 0; | |
1115 | } | |
1116 | ||
52b97de3 | 1117 | static int seq_profile_attach_show(struct seq_file *seq, void *v) |
556d0be7 | 1118 | { |
8399588a | 1119 | struct aa_proxy *proxy = seq->private; |
637f688d JJ |
1120 | struct aa_label *label = aa_get_label_rcu(&proxy->label); |
1121 | struct aa_profile *profile = labels_profile(label); | |
556d0be7 JJ |
1122 | if (profile->attach) |
1123 | seq_printf(seq, "%s\n", profile->attach); | |
1124 | else if (profile->xmatch) | |
1125 | seq_puts(seq, "<unknown>\n"); | |
1126 | else | |
1127 | seq_printf(seq, "%s\n", profile->base.name); | |
637f688d | 1128 | aa_put_label(label); |
556d0be7 JJ |
1129 | |
1130 | return 0; | |
1131 | } | |
1132 | ||
52b97de3 | 1133 | static int seq_profile_hash_show(struct seq_file *seq, void *v) |
f8eb8a13 | 1134 | { |
8399588a | 1135 | struct aa_proxy *proxy = seq->private; |
637f688d JJ |
1136 | struct aa_label *label = aa_get_label_rcu(&proxy->label); |
1137 | struct aa_profile *profile = labels_profile(label); | |
f8eb8a13 JJ |
1138 | unsigned int i, size = aa_hash_size(); |
1139 | ||
1140 | if (profile->hash) { | |
1141 | for (i = 0; i < size; i++) | |
1142 | seq_printf(seq, "%.2x", profile->hash[i]); | |
47dbd1cd | 1143 | seq_putc(seq, '\n'); |
f8eb8a13 | 1144 | } |
637f688d | 1145 | aa_put_label(label); |
f8eb8a13 JJ |
1146 | |
1147 | return 0; | |
1148 | } | |
1149 | ||
52b97de3 JJ |
1150 | SEQ_PROFILE_FOPS(name); |
1151 | SEQ_PROFILE_FOPS(mode); | |
1152 | SEQ_PROFILE_FOPS(attach); | |
1153 | SEQ_PROFILE_FOPS(hash); | |
f8eb8a13 | 1154 | |
64c86970 JJ |
1155 | /* |
1156 | * namespace based files | |
1157 | * several root files and | |
1158 | * policy/ * | |
1159 | */ | |
f8eb8a13 | 1160 | |
64c86970 JJ |
1161 | #define SEQ_NS_FOPS(NAME) \ |
1162 | static int seq_ns_ ##NAME ##_open(struct inode *inode, struct file *file) \ | |
1163 | { \ | |
1164 | return single_open(file, seq_ns_ ##NAME ##_show, inode->i_private); \ | |
1165 | } \ | |
1166 | \ | |
1167 | static const struct file_operations seq_ns_ ##NAME ##_fops = { \ | |
1168 | .owner = THIS_MODULE, \ | |
1169 | .open = seq_ns_ ##NAME ##_open, \ | |
1170 | .read = seq_read, \ | |
1171 | .llseek = seq_lseek, \ | |
1172 | .release = single_release, \ | |
1173 | } \ | |
3e3e5695 | 1174 | |
40cde7fc JJ |
1175 | static int seq_ns_stacked_show(struct seq_file *seq, void *v) |
1176 | { | |
1177 | struct aa_label *label; | |
1178 | ||
1179 | label = begin_current_label_crit_section(); | |
1180 | seq_printf(seq, "%s\n", label->size > 1 ? "yes" : "no"); | |
1181 | end_current_label_crit_section(label); | |
1182 | ||
1183 | return 0; | |
1184 | } | |
1185 | ||
1186 | static int seq_ns_nsstacked_show(struct seq_file *seq, void *v) | |
1187 | { | |
1188 | struct aa_label *label; | |
1189 | struct aa_profile *profile; | |
1190 | struct label_it it; | |
1191 | int count = 1; | |
1192 | ||
1193 | label = begin_current_label_crit_section(); | |
1194 | ||
1195 | if (label->size > 1) { | |
1196 | label_for_each(it, label, profile) | |
1197 | if (profile->ns != labels_ns(label)) { | |
1198 | count++; | |
1199 | break; | |
1200 | } | |
1201 | } | |
1202 | ||
1203 | seq_printf(seq, "%s\n", count > 1 ? "yes" : "no"); | |
1204 | end_current_label_crit_section(label); | |
1205 | ||
1206 | return 0; | |
1207 | } | |
1208 | ||
64c86970 | 1209 | static int seq_ns_level_show(struct seq_file *seq, void *v) |
a71ada30 | 1210 | { |
637f688d | 1211 | struct aa_label *label; |
a71ada30 | 1212 | |
637f688d JJ |
1213 | label = begin_current_label_crit_section(); |
1214 | seq_printf(seq, "%d\n", labels_ns(label)->level); | |
1215 | end_current_label_crit_section(label); | |
a71ada30 JJ |
1216 | |
1217 | return 0; | |
1218 | } | |
1219 | ||
64c86970 | 1220 | static int seq_ns_name_show(struct seq_file *seq, void *v) |
3e3e5695 | 1221 | { |
637f688d | 1222 | struct aa_label *label = begin_current_label_crit_section(); |
040d9e2b | 1223 | seq_printf(seq, "%s\n", labels_ns(label)->base.name); |
637f688d | 1224 | end_current_label_crit_section(label); |
3e3e5695 JJ |
1225 | |
1226 | return 0; | |
1227 | } | |
1228 | ||
40cde7fc JJ |
1229 | SEQ_NS_FOPS(stacked); |
1230 | SEQ_NS_FOPS(nsstacked); | |
64c86970 JJ |
1231 | SEQ_NS_FOPS(level); |
1232 | SEQ_NS_FOPS(name); | |
3e3e5695 | 1233 | |
5d5182ca JJ |
1234 | |
1235 | /* policy/raw_data/ * file ops */ | |
1236 | ||
1237 | #define SEQ_RAWDATA_FOPS(NAME) \ | |
1238 | static int seq_rawdata_ ##NAME ##_open(struct inode *inode, struct file *file)\ | |
1239 | { \ | |
1240 | return seq_rawdata_open(inode, file, seq_rawdata_ ##NAME ##_show); \ | |
1241 | } \ | |
1242 | \ | |
1243 | static const struct file_operations seq_rawdata_ ##NAME ##_fops = { \ | |
1244 | .owner = THIS_MODULE, \ | |
1245 | .open = seq_rawdata_ ##NAME ##_open, \ | |
1246 | .read = seq_read, \ | |
1247 | .llseek = seq_lseek, \ | |
1248 | .release = seq_rawdata_release, \ | |
1249 | } \ | |
1250 | ||
1251 | static int seq_rawdata_open(struct inode *inode, struct file *file, | |
1252 | int (*show)(struct seq_file *, void *)) | |
5ac8c355 | 1253 | { |
5d5182ca JJ |
1254 | struct aa_loaddata *data = __aa_get_loaddata(inode->i_private); |
1255 | int error; | |
5ac8c355 | 1256 | |
5d5182ca JJ |
1257 | if (!data) |
1258 | /* lost race this ent is being reaped */ | |
1259 | return -ENOENT; | |
1260 | ||
1261 | error = single_open(file, show, data); | |
1262 | if (error) { | |
1263 | AA_BUG(file->private_data && | |
1264 | ((struct seq_file *)file->private_data)->private); | |
1265 | aa_put_loaddata(data); | |
1266 | } | |
1267 | ||
1268 | return error; | |
5ac8c355 JJ |
1269 | } |
1270 | ||
5d5182ca | 1271 | static int seq_rawdata_release(struct inode *inode, struct file *file) |
5ac8c355 | 1272 | { |
5d5182ca | 1273 | struct seq_file *seq = (struct seq_file *) file->private_data; |
5ac8c355 | 1274 | |
5d5182ca JJ |
1275 | if (seq) |
1276 | aa_put_loaddata(seq->private); | |
0ff3d97f | 1277 | |
5d5182ca JJ |
1278 | return single_release(inode, file); |
1279 | } | |
1280 | ||
1281 | static int seq_rawdata_abi_show(struct seq_file *seq, void *v) | |
1282 | { | |
1283 | struct aa_loaddata *data = seq->private; | |
1284 | ||
1285 | seq_printf(seq, "v%d\n", data->abi); | |
5ac8c355 JJ |
1286 | |
1287 | return 0; | |
1288 | } | |
1289 | ||
5d5182ca | 1290 | static int seq_rawdata_revision_show(struct seq_file *seq, void *v) |
5ac8c355 | 1291 | { |
5d5182ca | 1292 | struct aa_loaddata *data = seq->private; |
5ac8c355 | 1293 | |
5d5182ca JJ |
1294 | seq_printf(seq, "%ld\n", data->revision); |
1295 | ||
1296 | return 0; | |
1297 | } | |
5ac8c355 | 1298 | |
5d5182ca | 1299 | static int seq_rawdata_hash_show(struct seq_file *seq, void *v) |
5ac8c355 | 1300 | { |
5d5182ca | 1301 | struct aa_loaddata *data = seq->private; |
5ac8c355 JJ |
1302 | unsigned int i, size = aa_hash_size(); |
1303 | ||
5d5182ca | 1304 | if (data->hash) { |
5ac8c355 | 1305 | for (i = 0; i < size; i++) |
5d5182ca | 1306 | seq_printf(seq, "%.2x", data->hash[i]); |
47dbd1cd | 1307 | seq_putc(seq, '\n'); |
5ac8c355 | 1308 | } |
5ac8c355 JJ |
1309 | |
1310 | return 0; | |
1311 | } | |
1312 | ||
63c16c3a CC |
1313 | static int seq_rawdata_compressed_size_show(struct seq_file *seq, void *v) |
1314 | { | |
1315 | struct aa_loaddata *data = seq->private; | |
1316 | ||
1317 | seq_printf(seq, "%zu\n", data->compressed_size); | |
1318 | ||
1319 | return 0; | |
1320 | } | |
1321 | ||
5d5182ca JJ |
1322 | SEQ_RAWDATA_FOPS(abi); |
1323 | SEQ_RAWDATA_FOPS(revision); | |
1324 | SEQ_RAWDATA_FOPS(hash); | |
63c16c3a CC |
1325 | SEQ_RAWDATA_FOPS(compressed_size); |
1326 | ||
1327 | static int deflate_decompress(char *src, size_t slen, char *dst, size_t dlen) | |
1328 | { | |
1329 | int error; | |
1330 | struct z_stream_s strm; | |
1331 | ||
1332 | if (aa_g_rawdata_compression_level == 0) { | |
1333 | if (dlen < slen) | |
1334 | return -EINVAL; | |
1335 | memcpy(dst, src, slen); | |
1336 | return 0; | |
1337 | } | |
1338 | ||
1339 | memset(&strm, 0, sizeof(strm)); | |
1340 | ||
1341 | strm.workspace = kvzalloc(zlib_inflate_workspacesize(), GFP_KERNEL); | |
1342 | if (!strm.workspace) | |
1343 | return -ENOMEM; | |
1344 | ||
1345 | strm.next_in = src; | |
1346 | strm.avail_in = slen; | |
1347 | ||
1348 | error = zlib_inflateInit(&strm); | |
1349 | if (error != Z_OK) { | |
1350 | error = -ENOMEM; | |
1351 | goto fail_inflate_init; | |
1352 | } | |
1353 | ||
1354 | strm.next_out = dst; | |
1355 | strm.avail_out = dlen; | |
1356 | ||
1357 | error = zlib_inflate(&strm, Z_FINISH); | |
1358 | if (error != Z_STREAM_END) | |
1359 | error = -EINVAL; | |
1360 | else | |
1361 | error = 0; | |
1362 | ||
1363 | zlib_inflateEnd(&strm); | |
1364 | fail_inflate_init: | |
1365 | kvfree(strm.workspace); | |
1366 | return error; | |
1367 | } | |
5ac8c355 JJ |
1368 | |
1369 | static ssize_t rawdata_read(struct file *file, char __user *buf, size_t size, | |
1370 | loff_t *ppos) | |
1371 | { | |
63c16c3a | 1372 | struct rawdata_f_data *private = file->private_data; |
5ac8c355 | 1373 | |
63c16c3a CC |
1374 | return simple_read_from_buffer(buf, size, ppos, |
1375 | RAWDATA_F_DATA_BUF(private), | |
1376 | private->loaddata->size); | |
5ac8c355 JJ |
1377 | } |
1378 | ||
5d5182ca | 1379 | static int rawdata_release(struct inode *inode, struct file *file) |
5ac8c355 | 1380 | { |
63c16c3a | 1381 | rawdata_f_data_free(file->private_data); |
5d5182ca JJ |
1382 | |
1383 | return 0; | |
1384 | } | |
5ac8c355 | 1385 | |
5d5182ca JJ |
1386 | static int rawdata_open(struct inode *inode, struct file *file) |
1387 | { | |
63c16c3a CC |
1388 | int error; |
1389 | struct aa_loaddata *loaddata; | |
1390 | struct rawdata_f_data *private; | |
1391 | ||
5ac8c355 JJ |
1392 | if (!policy_view_capable(NULL)) |
1393 | return -EACCES; | |
63c16c3a CC |
1394 | |
1395 | loaddata = __aa_get_loaddata(inode->i_private); | |
1396 | if (!loaddata) | |
5d5182ca JJ |
1397 | /* lost race: this entry is being reaped */ |
1398 | return -ENOENT; | |
5ac8c355 | 1399 | |
63c16c3a CC |
1400 | private = rawdata_f_data_alloc(loaddata->size); |
1401 | if (IS_ERR(private)) { | |
1402 | error = PTR_ERR(private); | |
1403 | goto fail_private_alloc; | |
1404 | } | |
1405 | ||
1406 | private->loaddata = loaddata; | |
1407 | ||
1408 | error = deflate_decompress(loaddata->data, loaddata->compressed_size, | |
1409 | RAWDATA_F_DATA_BUF(private), | |
1410 | loaddata->size); | |
1411 | if (error) | |
1412 | goto fail_decompress; | |
1413 | ||
1414 | file->private_data = private; | |
5ac8c355 | 1415 | return 0; |
63c16c3a CC |
1416 | |
1417 | fail_decompress: | |
1418 | rawdata_f_data_free(private); | |
1419 | return error; | |
1420 | ||
1421 | fail_private_alloc: | |
1422 | aa_put_loaddata(loaddata); | |
1423 | return error; | |
5ac8c355 JJ |
1424 | } |
1425 | ||
5d5182ca | 1426 | static const struct file_operations rawdata_fops = { |
5ac8c355 JJ |
1427 | .open = rawdata_open, |
1428 | .read = rawdata_read, | |
1429 | .llseek = generic_file_llseek, | |
1430 | .release = rawdata_release, | |
1431 | }; | |
1432 | ||
5d5182ca JJ |
1433 | static void remove_rawdata_dents(struct aa_loaddata *rawdata) |
1434 | { | |
1435 | int i; | |
1436 | ||
1437 | for (i = 0; i < AAFS_LOADDATA_NDENTS; i++) { | |
1438 | if (!IS_ERR_OR_NULL(rawdata->dents[i])) { | |
1439 | /* no refcounts on i_private */ | |
c961ee5f | 1440 | aafs_remove(rawdata->dents[i]); |
5d5182ca JJ |
1441 | rawdata->dents[i] = NULL; |
1442 | } | |
1443 | } | |
1444 | } | |
1445 | ||
1446 | void __aa_fs_remove_rawdata(struct aa_loaddata *rawdata) | |
1447 | { | |
1448 | AA_BUG(rawdata->ns && !mutex_is_locked(&rawdata->ns->lock)); | |
1449 | ||
1450 | if (rawdata->ns) { | |
1451 | remove_rawdata_dents(rawdata); | |
1452 | list_del_init(&rawdata->list); | |
1453 | aa_put_ns(rawdata->ns); | |
1454 | rawdata->ns = NULL; | |
1455 | } | |
1456 | } | |
1457 | ||
1458 | int __aa_fs_create_rawdata(struct aa_ns *ns, struct aa_loaddata *rawdata) | |
1459 | { | |
1460 | struct dentry *dent, *dir; | |
1461 | ||
1462 | AA_BUG(!ns); | |
1463 | AA_BUG(!rawdata); | |
1464 | AA_BUG(!mutex_is_locked(&ns->lock)); | |
1465 | AA_BUG(!ns_subdata_dir(ns)); | |
1466 | ||
1467 | /* | |
1468 | * just use ns revision dir was originally created at. This is | |
1469 | * under ns->lock and if load is successful revision will be | |
1470 | * bumped and is guaranteed to be unique | |
1471 | */ | |
1472 | rawdata->name = kasprintf(GFP_KERNEL, "%ld", ns->revision); | |
1473 | if (!rawdata->name) | |
1474 | return -ENOMEM; | |
1475 | ||
c961ee5f | 1476 | dir = aafs_create_dir(rawdata->name, ns_subdata_dir(ns)); |
5d5182ca JJ |
1477 | if (IS_ERR(dir)) |
1478 | /* ->name freed when rawdata freed */ | |
1479 | return PTR_ERR(dir); | |
1480 | rawdata->dents[AAFS_LOADDATA_DIR] = dir; | |
1481 | ||
c961ee5f | 1482 | dent = aafs_create_file("abi", S_IFREG | 0444, dir, rawdata, |
5d5182ca JJ |
1483 | &seq_rawdata_abi_fops); |
1484 | if (IS_ERR(dent)) | |
1485 | goto fail; | |
1486 | rawdata->dents[AAFS_LOADDATA_ABI] = dent; | |
1487 | ||
c961ee5f | 1488 | dent = aafs_create_file("revision", S_IFREG | 0444, dir, rawdata, |
5d5182ca JJ |
1489 | &seq_rawdata_revision_fops); |
1490 | if (IS_ERR(dent)) | |
1491 | goto fail; | |
1492 | rawdata->dents[AAFS_LOADDATA_REVISION] = dent; | |
1493 | ||
1494 | if (aa_g_hash_policy) { | |
c961ee5f | 1495 | dent = aafs_create_file("sha1", S_IFREG | 0444, dir, |
5d5182ca JJ |
1496 | rawdata, &seq_rawdata_hash_fops); |
1497 | if (IS_ERR(dent)) | |
1498 | goto fail; | |
1499 | rawdata->dents[AAFS_LOADDATA_HASH] = dent; | |
1500 | } | |
1501 | ||
63c16c3a CC |
1502 | dent = aafs_create_file("compressed_size", S_IFREG | 0444, dir, |
1503 | rawdata, | |
1504 | &seq_rawdata_compressed_size_fops); | |
1505 | if (IS_ERR(dent)) | |
1506 | goto fail; | |
1507 | rawdata->dents[AAFS_LOADDATA_COMPRESSED_SIZE] = dent; | |
1508 | ||
c961ee5f | 1509 | dent = aafs_create_file("raw_data", S_IFREG | 0444, |
5d5182ca JJ |
1510 | dir, rawdata, &rawdata_fops); |
1511 | if (IS_ERR(dent)) | |
1512 | goto fail; | |
1513 | rawdata->dents[AAFS_LOADDATA_DATA] = dent; | |
1514 | d_inode(dent)->i_size = rawdata->size; | |
1515 | ||
1516 | rawdata->ns = aa_get_ns(ns); | |
1517 | list_add(&rawdata->list, &ns->rawdata_list); | |
1518 | /* no refcount on inode rawdata */ | |
1519 | ||
1520 | return 0; | |
1521 | ||
1522 | fail: | |
1523 | remove_rawdata_dents(rawdata); | |
1524 | ||
1525 | return PTR_ERR(dent); | |
1526 | } | |
1527 | ||
0d259f04 | 1528 | /** fns to setup dynamic per profile/namespace files **/ |
c97204ba JJ |
1529 | |
1530 | /** | |
1531 | * | |
1532 | * Requires: @profile->ns->lock held | |
1533 | */ | |
1534 | void __aafs_profile_rmdir(struct aa_profile *profile) | |
0d259f04 JJ |
1535 | { |
1536 | struct aa_profile *child; | |
1537 | int i; | |
1538 | ||
1539 | if (!profile) | |
1540 | return; | |
1541 | ||
1542 | list_for_each_entry(child, &profile->base.profiles, base.list) | |
c97204ba | 1543 | __aafs_profile_rmdir(child); |
0d259f04 JJ |
1544 | |
1545 | for (i = AAFS_PROF_SIZEOF - 1; i >= 0; --i) { | |
8399588a | 1546 | struct aa_proxy *proxy; |
0d259f04 JJ |
1547 | if (!profile->dents[i]) |
1548 | continue; | |
1549 | ||
8399588a | 1550 | proxy = d_inode(profile->dents[i])->i_private; |
c961ee5f | 1551 | aafs_remove(profile->dents[i]); |
8399588a | 1552 | aa_put_proxy(proxy); |
0d259f04 JJ |
1553 | profile->dents[i] = NULL; |
1554 | } | |
1555 | } | |
1556 | ||
c97204ba JJ |
1557 | /** |
1558 | * | |
1559 | * Requires: @old->ns->lock held | |
1560 | */ | |
1561 | void __aafs_profile_migrate_dents(struct aa_profile *old, | |
1562 | struct aa_profile *new) | |
0d259f04 JJ |
1563 | { |
1564 | int i; | |
1565 | ||
cbf2d0e1 JJ |
1566 | AA_BUG(!old); |
1567 | AA_BUG(!new); | |
1568 | AA_BUG(!mutex_is_locked(&profiles_ns(old)->lock)); | |
1569 | ||
0d259f04 JJ |
1570 | for (i = 0; i < AAFS_PROF_SIZEOF; i++) { |
1571 | new->dents[i] = old->dents[i]; | |
d671e890 | 1572 | if (new->dents[i]) |
078cd827 | 1573 | new->dents[i]->d_inode->i_mtime = current_time(new->dents[i]->d_inode); |
0d259f04 JJ |
1574 | old->dents[i] = NULL; |
1575 | } | |
1576 | } | |
1577 | ||
1578 | static struct dentry *create_profile_file(struct dentry *dir, const char *name, | |
1579 | struct aa_profile *profile, | |
1580 | const struct file_operations *fops) | |
1581 | { | |
637f688d | 1582 | struct aa_proxy *proxy = aa_get_proxy(profile->label.proxy); |
0d259f04 JJ |
1583 | struct dentry *dent; |
1584 | ||
c961ee5f | 1585 | dent = aafs_create_file(name, S_IFREG | 0444, dir, proxy, fops); |
0d259f04 | 1586 | if (IS_ERR(dent)) |
8399588a | 1587 | aa_put_proxy(proxy); |
0d259f04 JJ |
1588 | |
1589 | return dent; | |
1590 | } | |
1591 | ||
5d5182ca JJ |
1592 | static int profile_depth(struct aa_profile *profile) |
1593 | { | |
1594 | int depth = 0; | |
1595 | ||
1596 | rcu_read_lock(); | |
1597 | for (depth = 0; profile; profile = rcu_access_pointer(profile->parent)) | |
1598 | depth++; | |
1599 | rcu_read_unlock(); | |
1600 | ||
1601 | return depth; | |
1602 | } | |
1603 | ||
1180b4c7 | 1604 | static char *gen_symlink_name(int depth, const char *dirname, const char *fname) |
5d5182ca | 1605 | { |
1180b4c7 | 1606 | char *buffer, *s; |
5d5182ca | 1607 | int error; |
1180b4c7 JJ |
1608 | int size = depth * 6 + strlen(dirname) + strlen(fname) + 11; |
1609 | ||
1610 | s = buffer = kmalloc(size, GFP_KERNEL); | |
1611 | if (!buffer) | |
1612 | return ERR_PTR(-ENOMEM); | |
5d5182ca JJ |
1613 | |
1614 | for (; depth > 0; depth--) { | |
1180b4c7 JJ |
1615 | strcpy(s, "../../"); |
1616 | s += 6; | |
1617 | size -= 6; | |
5d5182ca JJ |
1618 | } |
1619 | ||
1180b4c7 | 1620 | error = snprintf(s, size, "raw_data/%s/%s", dirname, fname); |
588558eb CIK |
1621 | if (error >= size || error < 0) { |
1622 | kfree(buffer); | |
1180b4c7 | 1623 | return ERR_PTR(-ENAMETOOLONG); |
588558eb | 1624 | } |
5d5182ca | 1625 | |
1180b4c7 JJ |
1626 | return buffer; |
1627 | } | |
1628 | ||
1629 | static void rawdata_link_cb(void *arg) | |
1630 | { | |
1631 | kfree(arg); | |
1632 | } | |
1633 | ||
1634 | static const char *rawdata_get_link_base(struct dentry *dentry, | |
1635 | struct inode *inode, | |
1636 | struct delayed_call *done, | |
1637 | const char *name) | |
1638 | { | |
1639 | struct aa_proxy *proxy = inode->i_private; | |
1640 | struct aa_label *label; | |
1641 | struct aa_profile *profile; | |
1642 | char *target; | |
1643 | int depth; | |
1644 | ||
1645 | if (!dentry) | |
1646 | return ERR_PTR(-ECHILD); | |
1647 | ||
1648 | label = aa_get_label_rcu(&proxy->label); | |
1649 | profile = labels_profile(label); | |
1650 | depth = profile_depth(profile); | |
1651 | target = gen_symlink_name(depth, profile->rawdata->name, name); | |
1652 | aa_put_label(label); | |
1653 | ||
1654 | if (IS_ERR(target)) | |
1655 | return target; | |
1656 | ||
1657 | set_delayed_call(done, rawdata_link_cb, target); | |
1658 | ||
1659 | return target; | |
1660 | } | |
1661 | ||
1662 | static const char *rawdata_get_link_sha1(struct dentry *dentry, | |
1663 | struct inode *inode, | |
1664 | struct delayed_call *done) | |
1665 | { | |
1666 | return rawdata_get_link_base(dentry, inode, done, "sha1"); | |
1667 | } | |
1668 | ||
1669 | static const char *rawdata_get_link_abi(struct dentry *dentry, | |
1670 | struct inode *inode, | |
1671 | struct delayed_call *done) | |
1672 | { | |
1673 | return rawdata_get_link_base(dentry, inode, done, "abi"); | |
5d5182ca JJ |
1674 | } |
1675 | ||
1180b4c7 JJ |
1676 | static const char *rawdata_get_link_data(struct dentry *dentry, |
1677 | struct inode *inode, | |
1678 | struct delayed_call *done) | |
1679 | { | |
1680 | return rawdata_get_link_base(dentry, inode, done, "raw_data"); | |
5d5182ca JJ |
1681 | } |
1682 | ||
1180b4c7 JJ |
1683 | static const struct inode_operations rawdata_link_sha1_iops = { |
1684 | .get_link = rawdata_get_link_sha1, | |
1685 | }; | |
1686 | ||
1687 | static const struct inode_operations rawdata_link_abi_iops = { | |
1688 | .get_link = rawdata_get_link_abi, | |
1689 | }; | |
1690 | static const struct inode_operations rawdata_link_data_iops = { | |
1691 | .get_link = rawdata_get_link_data, | |
1692 | }; | |
1693 | ||
1694 | ||
5d5182ca JJ |
1695 | /* |
1696 | * Requires: @profile->ns->lock held | |
1697 | */ | |
c97204ba | 1698 | int __aafs_profile_mkdir(struct aa_profile *profile, struct dentry *parent) |
0d259f04 JJ |
1699 | { |
1700 | struct aa_profile *child; | |
1701 | struct dentry *dent = NULL, *dir; | |
1702 | int error; | |
1703 | ||
cbf2d0e1 JJ |
1704 | AA_BUG(!profile); |
1705 | AA_BUG(!mutex_is_locked(&profiles_ns(profile)->lock)); | |
1706 | ||
0d259f04 JJ |
1707 | if (!parent) { |
1708 | struct aa_profile *p; | |
1709 | p = aa_deref_parent(profile); | |
1710 | dent = prof_dir(p); | |
1711 | /* adding to parent that previously didn't have children */ | |
c961ee5f | 1712 | dent = aafs_create_dir("profiles", dent); |
0d259f04 JJ |
1713 | if (IS_ERR(dent)) |
1714 | goto fail; | |
1715 | prof_child_dir(p) = parent = dent; | |
1716 | } | |
1717 | ||
1718 | if (!profile->dirname) { | |
1719 | int len, id_len; | |
1720 | len = mangle_name(profile->base.name, NULL); | |
1721 | id_len = snprintf(NULL, 0, ".%ld", profile->ns->uniq_id); | |
1722 | ||
1723 | profile->dirname = kmalloc(len + id_len + 1, GFP_KERNEL); | |
ffac1de6 DC |
1724 | if (!profile->dirname) { |
1725 | error = -ENOMEM; | |
1726 | goto fail2; | |
1727 | } | |
0d259f04 JJ |
1728 | |
1729 | mangle_name(profile->base.name, profile->dirname); | |
1730 | sprintf(profile->dirname + len, ".%ld", profile->ns->uniq_id++); | |
1731 | } | |
1732 | ||
c961ee5f | 1733 | dent = aafs_create_dir(profile->dirname, parent); |
0d259f04 JJ |
1734 | if (IS_ERR(dent)) |
1735 | goto fail; | |
1736 | prof_dir(profile) = dir = dent; | |
1737 | ||
52b97de3 JJ |
1738 | dent = create_profile_file(dir, "name", profile, |
1739 | &seq_profile_name_fops); | |
0d259f04 JJ |
1740 | if (IS_ERR(dent)) |
1741 | goto fail; | |
1742 | profile->dents[AAFS_PROF_NAME] = dent; | |
1743 | ||
52b97de3 JJ |
1744 | dent = create_profile_file(dir, "mode", profile, |
1745 | &seq_profile_mode_fops); | |
0d259f04 JJ |
1746 | if (IS_ERR(dent)) |
1747 | goto fail; | |
1748 | profile->dents[AAFS_PROF_MODE] = dent; | |
1749 | ||
556d0be7 | 1750 | dent = create_profile_file(dir, "attach", profile, |
52b97de3 | 1751 | &seq_profile_attach_fops); |
556d0be7 JJ |
1752 | if (IS_ERR(dent)) |
1753 | goto fail; | |
1754 | profile->dents[AAFS_PROF_ATTACH] = dent; | |
1755 | ||
f8eb8a13 JJ |
1756 | if (profile->hash) { |
1757 | dent = create_profile_file(dir, "sha1", profile, | |
52b97de3 | 1758 | &seq_profile_hash_fops); |
f8eb8a13 JJ |
1759 | if (IS_ERR(dent)) |
1760 | goto fail; | |
1761 | profile->dents[AAFS_PROF_HASH] = dent; | |
1762 | } | |
1763 | ||
5ac8c355 | 1764 | if (profile->rawdata) { |
1180b4c7 JJ |
1765 | dent = aafs_create_symlink("raw_sha1", dir, NULL, |
1766 | profile->label.proxy, | |
1767 | &rawdata_link_sha1_iops); | |
5ac8c355 JJ |
1768 | if (IS_ERR(dent)) |
1769 | goto fail; | |
1180b4c7 | 1770 | aa_get_proxy(profile->label.proxy); |
5ac8c355 JJ |
1771 | profile->dents[AAFS_PROF_RAW_HASH] = dent; |
1772 | ||
1180b4c7 JJ |
1773 | dent = aafs_create_symlink("raw_abi", dir, NULL, |
1774 | profile->label.proxy, | |
1775 | &rawdata_link_abi_iops); | |
5ac8c355 JJ |
1776 | if (IS_ERR(dent)) |
1777 | goto fail; | |
1180b4c7 | 1778 | aa_get_proxy(profile->label.proxy); |
5ac8c355 JJ |
1779 | profile->dents[AAFS_PROF_RAW_ABI] = dent; |
1780 | ||
1180b4c7 JJ |
1781 | dent = aafs_create_symlink("raw_data", dir, NULL, |
1782 | profile->label.proxy, | |
1783 | &rawdata_link_data_iops); | |
5ac8c355 JJ |
1784 | if (IS_ERR(dent)) |
1785 | goto fail; | |
1180b4c7 | 1786 | aa_get_proxy(profile->label.proxy); |
5ac8c355 | 1787 | profile->dents[AAFS_PROF_RAW_DATA] = dent; |
5ac8c355 JJ |
1788 | } |
1789 | ||
0d259f04 | 1790 | list_for_each_entry(child, &profile->base.profiles, base.list) { |
c97204ba | 1791 | error = __aafs_profile_mkdir(child, prof_child_dir(profile)); |
0d259f04 JJ |
1792 | if (error) |
1793 | goto fail2; | |
1794 | } | |
1795 | ||
1796 | return 0; | |
1797 | ||
1798 | fail: | |
1799 | error = PTR_ERR(dent); | |
1800 | ||
1801 | fail2: | |
c97204ba | 1802 | __aafs_profile_rmdir(profile); |
0d259f04 JJ |
1803 | |
1804 | return error; | |
1805 | } | |
1806 | ||
4ae47f33 JJ |
1807 | static int ns_mkdir_op(struct inode *dir, struct dentry *dentry, umode_t mode) |
1808 | { | |
1809 | struct aa_ns *ns, *parent; | |
1810 | /* TODO: improve permission check */ | |
637f688d JJ |
1811 | struct aa_label *label; |
1812 | int error; | |
1813 | ||
1814 | label = begin_current_label_crit_section(); | |
1815 | error = aa_may_manage_policy(label, NULL, AA_MAY_LOAD_POLICY); | |
1816 | end_current_label_crit_section(label); | |
4ae47f33 JJ |
1817 | if (error) |
1818 | return error; | |
1819 | ||
1820 | parent = aa_get_ns(dir->i_private); | |
1821 | AA_BUG(d_inode(ns_subns_dir(parent)) != dir); | |
1822 | ||
1823 | /* we have to unlock and then relock to get locking order right | |
1824 | * for pin_fs | |
1825 | */ | |
1826 | inode_unlock(dir); | |
1827 | error = simple_pin_fs(&aafs_ops, &aafs_mnt, &aafs_count); | |
feb3c766 | 1828 | mutex_lock_nested(&parent->lock, parent->level); |
4ae47f33 JJ |
1829 | inode_lock_nested(dir, I_MUTEX_PARENT); |
1830 | if (error) | |
1831 | goto out; | |
1832 | ||
1833 | error = __aafs_setup_d_inode(dir, dentry, mode | S_IFDIR, NULL, | |
1834 | NULL, NULL, NULL); | |
1835 | if (error) | |
1836 | goto out_pin; | |
1837 | ||
1838 | ns = __aa_find_or_create_ns(parent, READ_ONCE(dentry->d_name.name), | |
1839 | dentry); | |
1840 | if (IS_ERR(ns)) { | |
1841 | error = PTR_ERR(ns); | |
1842 | ns = NULL; | |
1843 | } | |
1844 | ||
1845 | aa_put_ns(ns); /* list ref remains */ | |
1846 | out_pin: | |
1847 | if (error) | |
1848 | simple_release_fs(&aafs_mnt, &aafs_count); | |
1849 | out: | |
1850 | mutex_unlock(&parent->lock); | |
1851 | aa_put_ns(parent); | |
1852 | ||
1853 | return error; | |
1854 | } | |
1855 | ||
1856 | static int ns_rmdir_op(struct inode *dir, struct dentry *dentry) | |
1857 | { | |
1858 | struct aa_ns *ns, *parent; | |
1859 | /* TODO: improve permission check */ | |
637f688d JJ |
1860 | struct aa_label *label; |
1861 | int error; | |
1862 | ||
1863 | label = begin_current_label_crit_section(); | |
1864 | error = aa_may_manage_policy(label, NULL, AA_MAY_LOAD_POLICY); | |
1865 | end_current_label_crit_section(label); | |
4ae47f33 JJ |
1866 | if (error) |
1867 | return error; | |
1868 | ||
566f52ec | 1869 | parent = aa_get_ns(dir->i_private); |
4ae47f33 JJ |
1870 | /* rmdir calls the generic securityfs functions to remove files |
1871 | * from the apparmor dir. It is up to the apparmor ns locking | |
1872 | * to avoid races. | |
1873 | */ | |
1874 | inode_unlock(dir); | |
1875 | inode_unlock(dentry->d_inode); | |
1876 | ||
feb3c766 | 1877 | mutex_lock_nested(&parent->lock, parent->level); |
4ae47f33 JJ |
1878 | ns = aa_get_ns(__aa_findn_ns(&parent->sub_ns, dentry->d_name.name, |
1879 | dentry->d_name.len)); | |
1880 | if (!ns) { | |
1881 | error = -ENOENT; | |
1882 | goto out; | |
1883 | } | |
1884 | AA_BUG(ns_dir(ns) != dentry); | |
1885 | ||
1886 | __aa_remove_ns(ns); | |
1887 | aa_put_ns(ns); | |
1888 | ||
1889 | out: | |
1890 | mutex_unlock(&parent->lock); | |
1891 | inode_lock_nested(dir, I_MUTEX_PARENT); | |
1892 | inode_lock(dentry->d_inode); | |
1893 | aa_put_ns(parent); | |
1894 | ||
1895 | return error; | |
1896 | } | |
1897 | ||
1898 | static const struct inode_operations ns_dir_inode_operations = { | |
1899 | .lookup = simple_lookup, | |
1900 | .mkdir = ns_mkdir_op, | |
1901 | .rmdir = ns_rmdir_op, | |
1902 | }; | |
1903 | ||
5d5182ca JJ |
1904 | static void __aa_fs_list_remove_rawdata(struct aa_ns *ns) |
1905 | { | |
1906 | struct aa_loaddata *ent, *tmp; | |
1907 | ||
1908 | AA_BUG(!mutex_is_locked(&ns->lock)); | |
1909 | ||
1910 | list_for_each_entry_safe(ent, tmp, &ns->rawdata_list, list) | |
1911 | __aa_fs_remove_rawdata(ent); | |
1912 | } | |
1913 | ||
c97204ba JJ |
1914 | /** |
1915 | * | |
1916 | * Requires: @ns->lock held | |
1917 | */ | |
1918 | void __aafs_ns_rmdir(struct aa_ns *ns) | |
0d259f04 | 1919 | { |
98849dff | 1920 | struct aa_ns *sub; |
0d259f04 JJ |
1921 | struct aa_profile *child; |
1922 | int i; | |
1923 | ||
1924 | if (!ns) | |
1925 | return; | |
cbf2d0e1 | 1926 | AA_BUG(!mutex_is_locked(&ns->lock)); |
0d259f04 JJ |
1927 | |
1928 | list_for_each_entry(child, &ns->base.profiles, base.list) | |
c97204ba | 1929 | __aafs_profile_rmdir(child); |
0d259f04 JJ |
1930 | |
1931 | list_for_each_entry(sub, &ns->sub_ns, base.list) { | |
feb3c766 | 1932 | mutex_lock_nested(&sub->lock, sub->level); |
c97204ba | 1933 | __aafs_ns_rmdir(sub); |
0d259f04 JJ |
1934 | mutex_unlock(&sub->lock); |
1935 | } | |
1936 | ||
5d5182ca JJ |
1937 | __aa_fs_list_remove_rawdata(ns); |
1938 | ||
b7fd2c03 JJ |
1939 | if (ns_subns_dir(ns)) { |
1940 | sub = d_inode(ns_subns_dir(ns))->i_private; | |
1941 | aa_put_ns(sub); | |
1942 | } | |
1943 | if (ns_subload(ns)) { | |
1944 | sub = d_inode(ns_subload(ns))->i_private; | |
1945 | aa_put_ns(sub); | |
1946 | } | |
1947 | if (ns_subreplace(ns)) { | |
1948 | sub = d_inode(ns_subreplace(ns))->i_private; | |
1949 | aa_put_ns(sub); | |
1950 | } | |
1951 | if (ns_subremove(ns)) { | |
1952 | sub = d_inode(ns_subremove(ns))->i_private; | |
1953 | aa_put_ns(sub); | |
1954 | } | |
d9bf2c26 JJ |
1955 | if (ns_subrevision(ns)) { |
1956 | sub = d_inode(ns_subrevision(ns))->i_private; | |
1957 | aa_put_ns(sub); | |
1958 | } | |
b7fd2c03 | 1959 | |
0d259f04 | 1960 | for (i = AAFS_NS_SIZEOF - 1; i >= 0; --i) { |
c961ee5f | 1961 | aafs_remove(ns->dents[i]); |
0d259f04 JJ |
1962 | ns->dents[i] = NULL; |
1963 | } | |
1964 | } | |
1965 | ||
b7fd2c03 | 1966 | /* assumes cleanup in caller */ |
c97204ba | 1967 | static int __aafs_ns_mkdir_entries(struct aa_ns *ns, struct dentry *dir) |
b7fd2c03 JJ |
1968 | { |
1969 | struct dentry *dent; | |
1970 | ||
1971 | AA_BUG(!ns); | |
1972 | AA_BUG(!dir); | |
1973 | ||
c961ee5f | 1974 | dent = aafs_create_dir("profiles", dir); |
b7fd2c03 JJ |
1975 | if (IS_ERR(dent)) |
1976 | return PTR_ERR(dent); | |
1977 | ns_subprofs_dir(ns) = dent; | |
1978 | ||
c961ee5f | 1979 | dent = aafs_create_dir("raw_data", dir); |
b7fd2c03 JJ |
1980 | if (IS_ERR(dent)) |
1981 | return PTR_ERR(dent); | |
1982 | ns_subdata_dir(ns) = dent; | |
1983 | ||
d9bf2c26 JJ |
1984 | dent = aafs_create_file("revision", 0444, dir, ns, |
1985 | &aa_fs_ns_revision_fops); | |
1986 | if (IS_ERR(dent)) | |
1987 | return PTR_ERR(dent); | |
1988 | aa_get_ns(ns); | |
1989 | ns_subrevision(ns) = dent; | |
1990 | ||
c961ee5f | 1991 | dent = aafs_create_file(".load", 0640, dir, ns, |
b7fd2c03 JJ |
1992 | &aa_fs_profile_load); |
1993 | if (IS_ERR(dent)) | |
1994 | return PTR_ERR(dent); | |
1995 | aa_get_ns(ns); | |
1996 | ns_subload(ns) = dent; | |
1997 | ||
c961ee5f | 1998 | dent = aafs_create_file(".replace", 0640, dir, ns, |
b7fd2c03 JJ |
1999 | &aa_fs_profile_replace); |
2000 | if (IS_ERR(dent)) | |
2001 | return PTR_ERR(dent); | |
2002 | aa_get_ns(ns); | |
2003 | ns_subreplace(ns) = dent; | |
2004 | ||
c961ee5f | 2005 | dent = aafs_create_file(".remove", 0640, dir, ns, |
b7fd2c03 JJ |
2006 | &aa_fs_profile_remove); |
2007 | if (IS_ERR(dent)) | |
2008 | return PTR_ERR(dent); | |
2009 | aa_get_ns(ns); | |
2010 | ns_subremove(ns) = dent; | |
2011 | ||
4ae47f33 JJ |
2012 | /* use create_dentry so we can supply private data */ |
2013 | dent = aafs_create("namespaces", S_IFDIR | 0755, dir, ns, NULL, NULL, | |
2014 | &ns_dir_inode_operations); | |
b7fd2c03 JJ |
2015 | if (IS_ERR(dent)) |
2016 | return PTR_ERR(dent); | |
2017 | aa_get_ns(ns); | |
2018 | ns_subns_dir(ns) = dent; | |
2019 | ||
2020 | return 0; | |
2021 | } | |
2022 | ||
c97204ba JJ |
2023 | /* |
2024 | * Requires: @ns->lock held | |
2025 | */ | |
98407f0a JJ |
2026 | int __aafs_ns_mkdir(struct aa_ns *ns, struct dentry *parent, const char *name, |
2027 | struct dentry *dent) | |
0d259f04 | 2028 | { |
98849dff | 2029 | struct aa_ns *sub; |
0d259f04 | 2030 | struct aa_profile *child; |
98407f0a | 2031 | struct dentry *dir; |
0d259f04 JJ |
2032 | int error; |
2033 | ||
b7fd2c03 JJ |
2034 | AA_BUG(!ns); |
2035 | AA_BUG(!parent); | |
2036 | AA_BUG(!mutex_is_locked(&ns->lock)); | |
2037 | ||
0d259f04 JJ |
2038 | if (!name) |
2039 | name = ns->base.name; | |
2040 | ||
c961ee5f JJ |
2041 | if (!dent) { |
2042 | /* create ns dir if it doesn't already exist */ | |
2043 | dent = aafs_create_dir(name, parent); | |
2044 | if (IS_ERR(dent)) | |
2045 | goto fail; | |
2046 | } else | |
2047 | dget(dent); | |
b7fd2c03 | 2048 | ns_dir(ns) = dir = dent; |
c97204ba | 2049 | error = __aafs_ns_mkdir_entries(ns, dir); |
b7fd2c03 JJ |
2050 | if (error) |
2051 | goto fail2; | |
0d259f04 | 2052 | |
b7fd2c03 | 2053 | /* profiles */ |
0d259f04 | 2054 | list_for_each_entry(child, &ns->base.profiles, base.list) { |
c97204ba | 2055 | error = __aafs_profile_mkdir(child, ns_subprofs_dir(ns)); |
0d259f04 JJ |
2056 | if (error) |
2057 | goto fail2; | |
2058 | } | |
2059 | ||
b7fd2c03 | 2060 | /* subnamespaces */ |
0d259f04 | 2061 | list_for_each_entry(sub, &ns->sub_ns, base.list) { |
feb3c766 | 2062 | mutex_lock_nested(&sub->lock, sub->level); |
98407f0a | 2063 | error = __aafs_ns_mkdir(sub, ns_subns_dir(ns), NULL, NULL); |
0d259f04 JJ |
2064 | mutex_unlock(&sub->lock); |
2065 | if (error) | |
2066 | goto fail2; | |
2067 | } | |
2068 | ||
2069 | return 0; | |
2070 | ||
2071 | fail: | |
2072 | error = PTR_ERR(dent); | |
2073 | ||
2074 | fail2: | |
c97204ba | 2075 | __aafs_ns_rmdir(ns); |
0d259f04 JJ |
2076 | |
2077 | return error; | |
2078 | } | |
2079 | ||
2080 | ||
29b3822f JJ |
2081 | #define list_entry_is_head(pos, head, member) (&pos->member == (head)) |
2082 | ||
2083 | /** | |
98849dff | 2084 | * __next_ns - find the next namespace to list |
29b3822f JJ |
2085 | * @root: root namespace to stop search at (NOT NULL) |
2086 | * @ns: current ns position (NOT NULL) | |
2087 | * | |
2088 | * Find the next namespace from @ns under @root and handle all locking needed | |
2089 | * while switching current namespace. | |
2090 | * | |
2091 | * Returns: next namespace or NULL if at last namespace under @root | |
2092 | * Requires: ns->parent->lock to be held | |
2093 | * NOTE: will not unlock root->lock | |
2094 | */ | |
98849dff | 2095 | static struct aa_ns *__next_ns(struct aa_ns *root, struct aa_ns *ns) |
29b3822f | 2096 | { |
98849dff | 2097 | struct aa_ns *parent, *next; |
29b3822f | 2098 | |
cbf2d0e1 JJ |
2099 | AA_BUG(!root); |
2100 | AA_BUG(!ns); | |
2101 | AA_BUG(ns != root && !mutex_is_locked(&ns->parent->lock)); | |
2102 | ||
29b3822f JJ |
2103 | /* is next namespace a child */ |
2104 | if (!list_empty(&ns->sub_ns)) { | |
2105 | next = list_first_entry(&ns->sub_ns, typeof(*ns), base.list); | |
feb3c766 | 2106 | mutex_lock_nested(&next->lock, next->level); |
29b3822f JJ |
2107 | return next; |
2108 | } | |
2109 | ||
2110 | /* check if the next ns is a sibling, parent, gp, .. */ | |
2111 | parent = ns->parent; | |
ed2c7da3 | 2112 | while (ns != root) { |
29b3822f | 2113 | mutex_unlock(&ns->lock); |
38dbd7d8 | 2114 | next = list_next_entry(ns, base.list); |
29b3822f | 2115 | if (!list_entry_is_head(next, &parent->sub_ns, base.list)) { |
feb3c766 | 2116 | mutex_lock_nested(&next->lock, next->level); |
29b3822f JJ |
2117 | return next; |
2118 | } | |
29b3822f JJ |
2119 | ns = parent; |
2120 | parent = parent->parent; | |
2121 | } | |
2122 | ||
2123 | return NULL; | |
2124 | } | |
2125 | ||
2126 | /** | |
2127 | * __first_profile - find the first profile in a namespace | |
2128 | * @root: namespace that is root of profiles being displayed (NOT NULL) | |
2129 | * @ns: namespace to start in (NOT NULL) | |
2130 | * | |
2131 | * Returns: unrefcounted profile or NULL if no profile | |
2132 | * Requires: profile->ns.lock to be held | |
2133 | */ | |
98849dff JJ |
2134 | static struct aa_profile *__first_profile(struct aa_ns *root, |
2135 | struct aa_ns *ns) | |
29b3822f | 2136 | { |
cbf2d0e1 JJ |
2137 | AA_BUG(!root); |
2138 | AA_BUG(ns && !mutex_is_locked(&ns->lock)); | |
2139 | ||
98849dff | 2140 | for (; ns; ns = __next_ns(root, ns)) { |
29b3822f JJ |
2141 | if (!list_empty(&ns->base.profiles)) |
2142 | return list_first_entry(&ns->base.profiles, | |
2143 | struct aa_profile, base.list); | |
2144 | } | |
2145 | return NULL; | |
2146 | } | |
2147 | ||
2148 | /** | |
2149 | * __next_profile - step to the next profile in a profile tree | |
2150 | * @profile: current profile in tree (NOT NULL) | |
2151 | * | |
2152 | * Perform a depth first traversal on the profile tree in a namespace | |
2153 | * | |
2154 | * Returns: next profile or NULL if done | |
2155 | * Requires: profile->ns.lock to be held | |
2156 | */ | |
2157 | static struct aa_profile *__next_profile(struct aa_profile *p) | |
2158 | { | |
2159 | struct aa_profile *parent; | |
98849dff | 2160 | struct aa_ns *ns = p->ns; |
29b3822f | 2161 | |
cbf2d0e1 JJ |
2162 | AA_BUG(!mutex_is_locked(&profiles_ns(p)->lock)); |
2163 | ||
29b3822f JJ |
2164 | /* is next profile a child */ |
2165 | if (!list_empty(&p->base.profiles)) | |
2166 | return list_first_entry(&p->base.profiles, typeof(*p), | |
2167 | base.list); | |
2168 | ||
2169 | /* is next profile a sibling, parent sibling, gp, sibling, .. */ | |
2170 | parent = rcu_dereference_protected(p->parent, | |
2171 | mutex_is_locked(&p->ns->lock)); | |
2172 | while (parent) { | |
38dbd7d8 | 2173 | p = list_next_entry(p, base.list); |
29b3822f JJ |
2174 | if (!list_entry_is_head(p, &parent->base.profiles, base.list)) |
2175 | return p; | |
2176 | p = parent; | |
2177 | parent = rcu_dereference_protected(parent->parent, | |
2178 | mutex_is_locked(&parent->ns->lock)); | |
2179 | } | |
2180 | ||
2181 | /* is next another profile in the namespace */ | |
38dbd7d8 | 2182 | p = list_next_entry(p, base.list); |
29b3822f JJ |
2183 | if (!list_entry_is_head(p, &ns->base.profiles, base.list)) |
2184 | return p; | |
2185 | ||
2186 | return NULL; | |
2187 | } | |
2188 | ||
2189 | /** | |
2190 | * next_profile - step to the next profile in where ever it may be | |
2191 | * @root: root namespace (NOT NULL) | |
2192 | * @profile: current profile (NOT NULL) | |
2193 | * | |
2194 | * Returns: next profile or NULL if there isn't one | |
2195 | */ | |
98849dff | 2196 | static struct aa_profile *next_profile(struct aa_ns *root, |
29b3822f JJ |
2197 | struct aa_profile *profile) |
2198 | { | |
2199 | struct aa_profile *next = __next_profile(profile); | |
2200 | if (next) | |
2201 | return next; | |
2202 | ||
2203 | /* finished all profiles in namespace move to next namespace */ | |
98849dff | 2204 | return __first_profile(root, __next_ns(root, profile->ns)); |
29b3822f JJ |
2205 | } |
2206 | ||
2207 | /** | |
2208 | * p_start - start a depth first traversal of profile tree | |
2209 | * @f: seq_file to fill | |
2210 | * @pos: current position | |
2211 | * | |
2212 | * Returns: first profile under current namespace or NULL if none found | |
2213 | * | |
2214 | * acquires first ns->lock | |
2215 | */ | |
2216 | static void *p_start(struct seq_file *f, loff_t *pos) | |
2217 | { | |
2218 | struct aa_profile *profile = NULL; | |
cf797c0e | 2219 | struct aa_ns *root = aa_get_current_ns(); |
29b3822f | 2220 | loff_t l = *pos; |
cf797c0e | 2221 | f->private = root; |
29b3822f JJ |
2222 | |
2223 | /* find the first profile */ | |
feb3c766 | 2224 | mutex_lock_nested(&root->lock, root->level); |
29b3822f JJ |
2225 | profile = __first_profile(root, root); |
2226 | ||
2227 | /* skip to position */ | |
2228 | for (; profile && l > 0; l--) | |
2229 | profile = next_profile(root, profile); | |
2230 | ||
2231 | return profile; | |
2232 | } | |
2233 | ||
2234 | /** | |
2235 | * p_next - read the next profile entry | |
2236 | * @f: seq_file to fill | |
2237 | * @p: profile previously returned | |
2238 | * @pos: current position | |
2239 | * | |
2240 | * Returns: next profile after @p or NULL if none | |
2241 | * | |
2242 | * may acquire/release locks in namespace tree as necessary | |
2243 | */ | |
2244 | static void *p_next(struct seq_file *f, void *p, loff_t *pos) | |
2245 | { | |
2246 | struct aa_profile *profile = p; | |
98849dff | 2247 | struct aa_ns *ns = f->private; |
29b3822f JJ |
2248 | (*pos)++; |
2249 | ||
2250 | return next_profile(ns, profile); | |
2251 | } | |
2252 | ||
2253 | /** | |
2254 | * p_stop - stop depth first traversal | |
2255 | * @f: seq_file we are filling | |
2256 | * @p: the last profile writen | |
2257 | * | |
2258 | * Release all locking done by p_start/p_next on namespace tree | |
2259 | */ | |
2260 | static void p_stop(struct seq_file *f, void *p) | |
2261 | { | |
2262 | struct aa_profile *profile = p; | |
98849dff | 2263 | struct aa_ns *root = f->private, *ns; |
29b3822f JJ |
2264 | |
2265 | if (profile) { | |
2266 | for (ns = profile->ns; ns && ns != root; ns = ns->parent) | |
2267 | mutex_unlock(&ns->lock); | |
2268 | } | |
2269 | mutex_unlock(&root->lock); | |
98849dff | 2270 | aa_put_ns(root); |
29b3822f JJ |
2271 | } |
2272 | ||
2273 | /** | |
2274 | * seq_show_profile - show a profile entry | |
2275 | * @f: seq_file to file | |
2276 | * @p: current position (profile) (NOT NULL) | |
2277 | * | |
2278 | * Returns: error on failure | |
2279 | */ | |
2280 | static int seq_show_profile(struct seq_file *f, void *p) | |
2281 | { | |
2282 | struct aa_profile *profile = (struct aa_profile *)p; | |
98849dff | 2283 | struct aa_ns *root = f->private; |
29b3822f | 2284 | |
637f688d JJ |
2285 | aa_label_seq_xprint(f, root, &profile->label, |
2286 | FLAG_SHOW_MODE | FLAG_VIEW_SUBNS, GFP_KERNEL); | |
2287 | seq_putc(f, '\n'); | |
29b3822f JJ |
2288 | |
2289 | return 0; | |
2290 | } | |
2291 | ||
c97204ba | 2292 | static const struct seq_operations aa_sfs_profiles_op = { |
29b3822f JJ |
2293 | .start = p_start, |
2294 | .next = p_next, | |
2295 | .stop = p_stop, | |
2296 | .show = seq_show_profile, | |
2297 | }; | |
2298 | ||
2299 | static int profiles_open(struct inode *inode, struct file *file) | |
2300 | { | |
5ac8c355 JJ |
2301 | if (!policy_view_capable(NULL)) |
2302 | return -EACCES; | |
2303 | ||
c97204ba | 2304 | return seq_open(file, &aa_sfs_profiles_op); |
29b3822f JJ |
2305 | } |
2306 | ||
2307 | static int profiles_release(struct inode *inode, struct file *file) | |
2308 | { | |
2309 | return seq_release(inode, file); | |
2310 | } | |
2311 | ||
c97204ba | 2312 | static const struct file_operations aa_sfs_profiles_fops = { |
29b3822f JJ |
2313 | .open = profiles_open, |
2314 | .read = seq_read, | |
2315 | .llseek = seq_lseek, | |
2316 | .release = profiles_release, | |
2317 | }; | |
2318 | ||
2319 | ||
0d259f04 | 2320 | /** Base file system setup **/ |
c97204ba JJ |
2321 | static struct aa_sfs_entry aa_sfs_entry_file[] = { |
2322 | AA_SFS_FILE_STRING("mask", | |
2323 | "create read write exec append mmap_exec link lock"), | |
a9bf8e9f KC |
2324 | { } |
2325 | }; | |
2326 | ||
290f458a JJ |
2327 | static struct aa_sfs_entry aa_sfs_entry_ptrace[] = { |
2328 | AA_SFS_FILE_STRING("mask", "read trace"), | |
2329 | { } | |
2330 | }; | |
2331 | ||
cd1dbf76 JJ |
2332 | static struct aa_sfs_entry aa_sfs_entry_signal[] = { |
2333 | AA_SFS_FILE_STRING("mask", AA_SFS_SIG_MASK), | |
2334 | { } | |
2335 | }; | |
2336 | ||
73f488cd JJ |
2337 | static struct aa_sfs_entry aa_sfs_entry_attach[] = { |
2338 | AA_SFS_FILE_BOOLEAN("xattr", 1), | |
2339 | { } | |
2340 | }; | |
c97204ba JJ |
2341 | static struct aa_sfs_entry aa_sfs_entry_domain[] = { |
2342 | AA_SFS_FILE_BOOLEAN("change_hat", 1), | |
2343 | AA_SFS_FILE_BOOLEAN("change_hatv", 1), | |
2344 | AA_SFS_FILE_BOOLEAN("change_onexec", 1), | |
2345 | AA_SFS_FILE_BOOLEAN("change_profile", 1), | |
6c5fc8f1 | 2346 | AA_SFS_FILE_BOOLEAN("stack", 1), |
c97204ba | 2347 | AA_SFS_FILE_BOOLEAN("fix_binfmt_elf_mmap", 1), |
9fcf78cc | 2348 | AA_SFS_FILE_BOOLEAN("post_nnp_subset", 1), |
21f60661 | 2349 | AA_SFS_FILE_BOOLEAN("computed_longest_left", 1), |
73f488cd | 2350 | AA_SFS_DIR("attach_conditions", aa_sfs_entry_attach), |
c97204ba | 2351 | AA_SFS_FILE_STRING("version", "1.2"), |
e74abcf3 KC |
2352 | { } |
2353 | }; | |
2354 | ||
c97204ba JJ |
2355 | static struct aa_sfs_entry aa_sfs_entry_versions[] = { |
2356 | AA_SFS_FILE_BOOLEAN("v5", 1), | |
5379a331 JJ |
2357 | AA_SFS_FILE_BOOLEAN("v6", 1), |
2358 | AA_SFS_FILE_BOOLEAN("v7", 1), | |
56974a6f | 2359 | AA_SFS_FILE_BOOLEAN("v8", 1), |
474d6b75 JJ |
2360 | { } |
2361 | }; | |
2362 | ||
c97204ba JJ |
2363 | static struct aa_sfs_entry aa_sfs_entry_policy[] = { |
2364 | AA_SFS_DIR("versions", aa_sfs_entry_versions), | |
2365 | AA_SFS_FILE_BOOLEAN("set_load", 1), | |
474d6b75 | 2366 | { } |
9d910a3b JJ |
2367 | }; |
2368 | ||
2ea3ffb7 JJ |
2369 | static struct aa_sfs_entry aa_sfs_entry_mount[] = { |
2370 | AA_SFS_FILE_STRING("mask", "mount umount pivot_root"), | |
2371 | { } | |
2372 | }; | |
2373 | ||
33f2eada JJ |
2374 | static struct aa_sfs_entry aa_sfs_entry_ns[] = { |
2375 | AA_SFS_FILE_BOOLEAN("profile", 1), | |
2ea3ffb7 | 2376 | AA_SFS_FILE_BOOLEAN("pivot_root", 0), |
33f2eada JJ |
2377 | { } |
2378 | }; | |
2379 | ||
a83bd86e | 2380 | static struct aa_sfs_entry aa_sfs_entry_query_label[] = { |
4f3b3f2d | 2381 | AA_SFS_FILE_STRING("perms", "allow deny audit quiet"), |
a83bd86e | 2382 | AA_SFS_FILE_BOOLEAN("data", 1), |
1dea3b41 | 2383 | AA_SFS_FILE_BOOLEAN("multi_transaction", 1), |
a83bd86e JJ |
2384 | { } |
2385 | }; | |
2386 | ||
2387 | static struct aa_sfs_entry aa_sfs_entry_query[] = { | |
2388 | AA_SFS_DIR("label", aa_sfs_entry_query_label), | |
2389 | { } | |
2390 | }; | |
c97204ba JJ |
2391 | static struct aa_sfs_entry aa_sfs_entry_features[] = { |
2392 | AA_SFS_DIR("policy", aa_sfs_entry_policy), | |
2393 | AA_SFS_DIR("domain", aa_sfs_entry_domain), | |
2394 | AA_SFS_DIR("file", aa_sfs_entry_file), | |
56974a6f | 2395 | AA_SFS_DIR("network_v8", aa_sfs_entry_network), |
2ea3ffb7 | 2396 | AA_SFS_DIR("mount", aa_sfs_entry_mount), |
33f2eada | 2397 | AA_SFS_DIR("namespaces", aa_sfs_entry_ns), |
c97204ba JJ |
2398 | AA_SFS_FILE_U64("capability", VFS_CAP_FLAGS_MASK), |
2399 | AA_SFS_DIR("rlimit", aa_sfs_entry_rlimit), | |
2400 | AA_SFS_DIR("caps", aa_sfs_entry_caps), | |
290f458a | 2401 | AA_SFS_DIR("ptrace", aa_sfs_entry_ptrace), |
cd1dbf76 | 2402 | AA_SFS_DIR("signal", aa_sfs_entry_signal), |
a83bd86e | 2403 | AA_SFS_DIR("query", aa_sfs_entry_query), |
e74abcf3 KC |
2404 | { } |
2405 | }; | |
2406 | ||
c97204ba | 2407 | static struct aa_sfs_entry aa_sfs_entry_apparmor[] = { |
bf81100f | 2408 | AA_SFS_FILE_FOPS(".access", 0666, &aa_sfs_access), |
6c5fc8f1 JJ |
2409 | AA_SFS_FILE_FOPS(".stacked", 0444, &seq_ns_stacked_fops), |
2410 | AA_SFS_FILE_FOPS(".ns_stacked", 0444, &seq_ns_nsstacked_fops), | |
bf81100f JJ |
2411 | AA_SFS_FILE_FOPS(".ns_level", 0444, &seq_ns_level_fops), |
2412 | AA_SFS_FILE_FOPS(".ns_name", 0444, &seq_ns_name_fops), | |
2413 | AA_SFS_FILE_FOPS("profiles", 0444, &aa_sfs_profiles_fops), | |
c97204ba | 2414 | AA_SFS_DIR("features", aa_sfs_entry_features), |
9acd494b KC |
2415 | { } |
2416 | }; | |
63e2b423 | 2417 | |
c97204ba JJ |
2418 | static struct aa_sfs_entry aa_sfs_entry = |
2419 | AA_SFS_DIR("apparmor", aa_sfs_entry_apparmor); | |
63e2b423 | 2420 | |
9acd494b | 2421 | /** |
a481f4d9 | 2422 | * entry_create_file - create a file entry in the apparmor securityfs |
c97204ba | 2423 | * @fs_file: aa_sfs_entry to build an entry for (NOT NULL) |
9acd494b KC |
2424 | * @parent: the parent dentry in the securityfs |
2425 | * | |
a481f4d9 | 2426 | * Use entry_remove_file to remove entries created with this fn. |
9acd494b | 2427 | */ |
c97204ba | 2428 | static int __init entry_create_file(struct aa_sfs_entry *fs_file, |
a481f4d9 | 2429 | struct dentry *parent) |
9acd494b KC |
2430 | { |
2431 | int error = 0; | |
2432 | ||
2433 | fs_file->dentry = securityfs_create_file(fs_file->name, | |
2434 | S_IFREG | fs_file->mode, | |
2435 | parent, fs_file, | |
2436 | fs_file->file_ops); | |
2437 | if (IS_ERR(fs_file->dentry)) { | |
2438 | error = PTR_ERR(fs_file->dentry); | |
2439 | fs_file->dentry = NULL; | |
63e2b423 | 2440 | } |
9acd494b | 2441 | return error; |
63e2b423 JJ |
2442 | } |
2443 | ||
c97204ba | 2444 | static void __init entry_remove_dir(struct aa_sfs_entry *fs_dir); |
63e2b423 | 2445 | /** |
a481f4d9 | 2446 | * entry_create_dir - recursively create a directory entry in the securityfs |
c97204ba | 2447 | * @fs_dir: aa_sfs_entry (and all child entries) to build (NOT NULL) |
9acd494b | 2448 | * @parent: the parent dentry in the securityfs |
63e2b423 | 2449 | * |
a481f4d9 | 2450 | * Use entry_remove_dir to remove entries created with this fn. |
63e2b423 | 2451 | */ |
c97204ba JJ |
2452 | static int __init entry_create_dir(struct aa_sfs_entry *fs_dir, |
2453 | struct dentry *parent) | |
63e2b423 | 2454 | { |
c97204ba | 2455 | struct aa_sfs_entry *fs_file; |
0d259f04 JJ |
2456 | struct dentry *dir; |
2457 | int error; | |
63e2b423 | 2458 | |
0d259f04 JJ |
2459 | dir = securityfs_create_dir(fs_dir->name, parent); |
2460 | if (IS_ERR(dir)) | |
2461 | return PTR_ERR(dir); | |
2462 | fs_dir->dentry = dir; | |
63e2b423 | 2463 | |
0d259f04 | 2464 | for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) { |
c97204ba | 2465 | if (fs_file->v_type == AA_SFS_TYPE_DIR) |
a481f4d9 | 2466 | error = entry_create_dir(fs_file, fs_dir->dentry); |
9acd494b | 2467 | else |
a481f4d9 | 2468 | error = entry_create_file(fs_file, fs_dir->dentry); |
9acd494b KC |
2469 | if (error) |
2470 | goto failed; | |
2471 | } | |
2472 | ||
2473 | return 0; | |
2474 | ||
2475 | failed: | |
a481f4d9 | 2476 | entry_remove_dir(fs_dir); |
0d259f04 | 2477 | |
9acd494b KC |
2478 | return error; |
2479 | } | |
2480 | ||
2481 | /** | |
c97204ba JJ |
2482 | * entry_remove_file - drop a single file entry in the apparmor securityfs |
2483 | * @fs_file: aa_sfs_entry to detach from the securityfs (NOT NULL) | |
9acd494b | 2484 | */ |
c97204ba | 2485 | static void __init entry_remove_file(struct aa_sfs_entry *fs_file) |
9acd494b KC |
2486 | { |
2487 | if (!fs_file->dentry) | |
2488 | return; | |
2489 | ||
2490 | securityfs_remove(fs_file->dentry); | |
2491 | fs_file->dentry = NULL; | |
2492 | } | |
2493 | ||
2494 | /** | |
a481f4d9 | 2495 | * entry_remove_dir - recursively drop a directory entry from the securityfs |
c97204ba | 2496 | * @fs_dir: aa_sfs_entry (and all child entries) to detach (NOT NULL) |
9acd494b | 2497 | */ |
c97204ba | 2498 | static void __init entry_remove_dir(struct aa_sfs_entry *fs_dir) |
9acd494b | 2499 | { |
c97204ba | 2500 | struct aa_sfs_entry *fs_file; |
9acd494b | 2501 | |
0d259f04 | 2502 | for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) { |
c97204ba | 2503 | if (fs_file->v_type == AA_SFS_TYPE_DIR) |
a481f4d9 | 2504 | entry_remove_dir(fs_file); |
9acd494b | 2505 | else |
c97204ba | 2506 | entry_remove_file(fs_file); |
9acd494b KC |
2507 | } |
2508 | ||
c97204ba | 2509 | entry_remove_file(fs_dir); |
63e2b423 JJ |
2510 | } |
2511 | ||
2512 | /** | |
2513 | * aa_destroy_aafs - cleanup and free aafs | |
2514 | * | |
2515 | * releases dentries allocated by aa_create_aafs | |
2516 | */ | |
2517 | void __init aa_destroy_aafs(void) | |
2518 | { | |
c97204ba | 2519 | entry_remove_dir(&aa_sfs_entry); |
63e2b423 JJ |
2520 | } |
2521 | ||
a71ada30 JJ |
2522 | |
2523 | #define NULL_FILE_NAME ".null" | |
2524 | struct path aa_null; | |
2525 | ||
2526 | static int aa_mk_null_file(struct dentry *parent) | |
2527 | { | |
2528 | struct vfsmount *mount = NULL; | |
2529 | struct dentry *dentry; | |
2530 | struct inode *inode; | |
2531 | int count = 0; | |
2532 | int error = simple_pin_fs(parent->d_sb->s_type, &mount, &count); | |
2533 | ||
2534 | if (error) | |
2535 | return error; | |
2536 | ||
2537 | inode_lock(d_inode(parent)); | |
2538 | dentry = lookup_one_len(NULL_FILE_NAME, parent, strlen(NULL_FILE_NAME)); | |
2539 | if (IS_ERR(dentry)) { | |
2540 | error = PTR_ERR(dentry); | |
2541 | goto out; | |
2542 | } | |
2543 | inode = new_inode(parent->d_inode->i_sb); | |
2544 | if (!inode) { | |
2545 | error = -ENOMEM; | |
2546 | goto out1; | |
2547 | } | |
2548 | ||
2549 | inode->i_ino = get_next_ino(); | |
2550 | inode->i_mode = S_IFCHR | S_IRUGO | S_IWUGO; | |
24d0d03c | 2551 | inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); |
a71ada30 JJ |
2552 | init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, |
2553 | MKDEV(MEM_MAJOR, 3)); | |
2554 | d_instantiate(dentry, inode); | |
2555 | aa_null.dentry = dget(dentry); | |
2556 | aa_null.mnt = mntget(mount); | |
2557 | ||
2558 | error = 0; | |
2559 | ||
2560 | out1: | |
2561 | dput(dentry); | |
2562 | out: | |
2563 | inode_unlock(d_inode(parent)); | |
2564 | simple_release_fs(&mount, &count); | |
2565 | return error; | |
2566 | } | |
2567 | ||
a481f4d9 JJ |
2568 | |
2569 | ||
2570 | static const char *policy_get_link(struct dentry *dentry, | |
2571 | struct inode *inode, | |
2572 | struct delayed_call *done) | |
2573 | { | |
2574 | struct aa_ns *ns; | |
2575 | struct path path; | |
2576 | ||
2577 | if (!dentry) | |
2578 | return ERR_PTR(-ECHILD); | |
2579 | ns = aa_get_current_ns(); | |
2580 | path.mnt = mntget(aafs_mnt); | |
2581 | path.dentry = dget(ns_dir(ns)); | |
2582 | nd_jump_link(&path); | |
2583 | aa_put_ns(ns); | |
2584 | ||
2585 | return NULL; | |
2586 | } | |
2587 | ||
a481f4d9 JJ |
2588 | static int policy_readlink(struct dentry *dentry, char __user *buffer, |
2589 | int buflen) | |
2590 | { | |
a481f4d9 JJ |
2591 | char name[32]; |
2592 | int res; | |
2593 | ||
a0781209 JJ |
2594 | res = snprintf(name, sizeof(name), "%s:[%lu]", AAFS_NAME, |
2595 | d_inode(dentry)->i_ino); | |
2596 | if (res > 0 && res < sizeof(name)) | |
a481f4d9 | 2597 | res = readlink_copy(buffer, buflen, name); |
a0781209 JJ |
2598 | else |
2599 | res = -ENOENT; | |
a481f4d9 JJ |
2600 | |
2601 | return res; | |
2602 | } | |
2603 | ||
2604 | static const struct inode_operations policy_link_iops = { | |
2605 | .readlink = policy_readlink, | |
2606 | .get_link = policy_get_link, | |
2607 | }; | |
2608 | ||
2609 | ||
63e2b423 JJ |
2610 | /** |
2611 | * aa_create_aafs - create the apparmor security filesystem | |
2612 | * | |
2613 | * dentries created here are released by aa_destroy_aafs | |
2614 | * | |
2615 | * Returns: error on failure | |
2616 | */ | |
3417d8d5 | 2617 | static int __init aa_create_aafs(void) |
63e2b423 | 2618 | { |
b7fd2c03 | 2619 | struct dentry *dent; |
63e2b423 JJ |
2620 | int error; |
2621 | ||
2622 | if (!apparmor_initialized) | |
2623 | return 0; | |
2624 | ||
c97204ba | 2625 | if (aa_sfs_entry.dentry) { |
63e2b423 JJ |
2626 | AA_ERROR("%s: AppArmor securityfs already exists\n", __func__); |
2627 | return -EEXIST; | |
2628 | } | |
2629 | ||
a481f4d9 JJ |
2630 | /* setup apparmorfs used to virtualize policy/ */ |
2631 | aafs_mnt = kern_mount(&aafs_ops); | |
2632 | if (IS_ERR(aafs_mnt)) | |
2633 | panic("can't set apparmorfs up\n"); | |
1751e8a6 | 2634 | aafs_mnt->mnt_sb->s_flags &= ~SB_NOUSER; |
a481f4d9 | 2635 | |
9acd494b | 2636 | /* Populate fs tree. */ |
c97204ba | 2637 | error = entry_create_dir(&aa_sfs_entry, NULL); |
63e2b423 JJ |
2638 | if (error) |
2639 | goto error; | |
2640 | ||
c97204ba | 2641 | dent = securityfs_create_file(".load", 0666, aa_sfs_entry.dentry, |
b7fd2c03 | 2642 | NULL, &aa_fs_profile_load); |
cf916000 JJ |
2643 | if (IS_ERR(dent)) |
2644 | goto dent_error; | |
b7fd2c03 JJ |
2645 | ns_subload(root_ns) = dent; |
2646 | ||
c97204ba | 2647 | dent = securityfs_create_file(".replace", 0666, aa_sfs_entry.dentry, |
b7fd2c03 | 2648 | NULL, &aa_fs_profile_replace); |
cf916000 JJ |
2649 | if (IS_ERR(dent)) |
2650 | goto dent_error; | |
b7fd2c03 JJ |
2651 | ns_subreplace(root_ns) = dent; |
2652 | ||
c97204ba | 2653 | dent = securityfs_create_file(".remove", 0666, aa_sfs_entry.dentry, |
b7fd2c03 | 2654 | NULL, &aa_fs_profile_remove); |
cf916000 JJ |
2655 | if (IS_ERR(dent)) |
2656 | goto dent_error; | |
b7fd2c03 JJ |
2657 | ns_subremove(root_ns) = dent; |
2658 | ||
d9bf2c26 JJ |
2659 | dent = securityfs_create_file("revision", 0444, aa_sfs_entry.dentry, |
2660 | NULL, &aa_fs_ns_revision_fops); | |
cf916000 JJ |
2661 | if (IS_ERR(dent)) |
2662 | goto dent_error; | |
d9bf2c26 JJ |
2663 | ns_subrevision(root_ns) = dent; |
2664 | ||
2665 | /* policy tree referenced by magic policy symlink */ | |
feb3c766 | 2666 | mutex_lock_nested(&root_ns->lock, root_ns->level); |
c961ee5f JJ |
2667 | error = __aafs_ns_mkdir(root_ns, aafs_mnt->mnt_root, ".policy", |
2668 | aafs_mnt->mnt_root); | |
b7fd2c03 | 2669 | mutex_unlock(&root_ns->lock); |
0d259f04 JJ |
2670 | if (error) |
2671 | goto error; | |
2672 | ||
c961ee5f JJ |
2673 | /* magic symlink similar to nsfs redirects based on task policy */ |
2674 | dent = securityfs_create_symlink("policy", aa_sfs_entry.dentry, | |
2675 | NULL, &policy_link_iops); | |
cf916000 JJ |
2676 | if (IS_ERR(dent)) |
2677 | goto dent_error; | |
c961ee5f | 2678 | |
c97204ba | 2679 | error = aa_mk_null_file(aa_sfs_entry.dentry); |
a71ada30 JJ |
2680 | if (error) |
2681 | goto error; | |
2682 | ||
2683 | /* TODO: add default profile to apparmorfs */ | |
63e2b423 JJ |
2684 | |
2685 | /* Report that AppArmor fs is enabled */ | |
2686 | aa_info_message("AppArmor Filesystem Enabled"); | |
2687 | return 0; | |
2688 | ||
cf916000 JJ |
2689 | dent_error: |
2690 | error = PTR_ERR(dent); | |
63e2b423 JJ |
2691 | error: |
2692 | aa_destroy_aafs(); | |
2693 | AA_ERROR("Error creating AppArmor securityfs\n"); | |
2694 | return error; | |
2695 | } | |
2696 | ||
2697 | fs_initcall(aa_create_aafs); |