Commit | Line | Data |
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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> |
f4d6b94b | 24 | #include <linux/zstd.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" |
eac93125 | 39 | #include "include/task.h" |
63e2b423 | 40 | |
c97204ba JJ |
41 | /* |
42 | * The apparmor filesystem interface used for policy load and introspection | |
43 | * The interface is split into two main components based on their function | |
44 | * a securityfs component: | |
45 | * used for static files that are always available, and which allows | |
46 | * userspace to specificy the location of the security filesystem. | |
47 | * | |
48 | * fns and data are prefixed with | |
49 | * aa_sfs_ | |
50 | * | |
51 | * an apparmorfs component: | |
52 | * used loaded policy content and introspection. It is not part of a | |
53 | * regular mounted filesystem and is available only through the magic | |
54 | * policy symlink in the root of the securityfs apparmor/ directory. | |
55 | * Tasks queries will be magically redirected to the correct portion | |
56 | * of the policy tree based on their confinement. | |
57 | * | |
58 | * fns and data are prefixed with | |
59 | * aafs_ | |
60 | * | |
61 | * The aa_fs_ prefix is used to indicate the fn is used by both the | |
62 | * securityfs and apparmorfs filesystems. | |
63 | */ | |
64 | ||
65 | ||
66 | /* | |
67 | * support fns | |
68 | */ | |
69 | ||
63c16c3a CC |
70 | struct rawdata_f_data { |
71 | struct aa_loaddata *loaddata; | |
72 | }; | |
73 | ||
d61c57fd | 74 | #ifdef CONFIG_SECURITY_APPARMOR_EXPORT_BINARY |
63c16c3a CC |
75 | #define RAWDATA_F_DATA_BUF(p) (char *)(p + 1) |
76 | ||
77 | static void rawdata_f_data_free(struct rawdata_f_data *private) | |
78 | { | |
79 | if (!private) | |
80 | return; | |
81 | ||
82 | aa_put_loaddata(private->loaddata); | |
83 | kvfree(private); | |
84 | } | |
85 | ||
86 | static struct rawdata_f_data *rawdata_f_data_alloc(size_t size) | |
87 | { | |
88 | struct rawdata_f_data *ret; | |
89 | ||
90 | if (size > SIZE_MAX - sizeof(*ret)) | |
91 | return ERR_PTR(-EINVAL); | |
92 | ||
93 | ret = kvzalloc(sizeof(*ret) + size, GFP_KERNEL); | |
94 | if (!ret) | |
95 | return ERR_PTR(-ENOMEM); | |
96 | ||
97 | return ret; | |
98 | } | |
d61c57fd | 99 | #endif |
63c16c3a | 100 | |
0d259f04 | 101 | /** |
564423bf | 102 | * mangle_name - mangle a profile name to std profile layout form |
0d259f04 JJ |
103 | * @name: profile name to mangle (NOT NULL) |
104 | * @target: buffer to store mangled name, same length as @name (MAYBE NULL) | |
105 | * | |
106 | * Returns: length of mangled name | |
107 | */ | |
bbe4a7c8 | 108 | static int mangle_name(const char *name, char *target) |
0d259f04 JJ |
109 | { |
110 | char *t = target; | |
111 | ||
112 | while (*name == '/' || *name == '.') | |
113 | name++; | |
114 | ||
115 | if (target) { | |
116 | for (; *name; name++) { | |
117 | if (*name == '/') | |
118 | *(t)++ = '.'; | |
119 | else if (isspace(*name)) | |
120 | *(t)++ = '_'; | |
121 | else if (isalnum(*name) || strchr("._-", *name)) | |
122 | *(t)++ = *name; | |
123 | } | |
124 | ||
125 | *t = 0; | |
126 | } else { | |
127 | int len = 0; | |
128 | for (; *name; name++) { | |
129 | if (isalnum(*name) || isspace(*name) || | |
130 | strchr("/._-", *name)) | |
131 | len++; | |
132 | } | |
133 | ||
134 | return len; | |
135 | } | |
136 | ||
137 | return t - target; | |
138 | } | |
139 | ||
a481f4d9 JJ |
140 | |
141 | /* | |
142 | * aafs - core fns and data for the policy tree | |
143 | */ | |
144 | ||
145 | #define AAFS_NAME "apparmorfs" | |
146 | static struct vfsmount *aafs_mnt; | |
147 | static int aafs_count; | |
148 | ||
149 | ||
150 | static int aafs_show_path(struct seq_file *seq, struct dentry *dentry) | |
151 | { | |
a0781209 | 152 | seq_printf(seq, "%s:[%lu]", AAFS_NAME, d_inode(dentry)->i_ino); |
a481f4d9 JJ |
153 | return 0; |
154 | } | |
155 | ||
27afa27d | 156 | static void aafs_free_inode(struct inode *inode) |
a481f4d9 | 157 | { |
a481f4d9 JJ |
158 | if (S_ISLNK(inode->i_mode)) |
159 | kfree(inode->i_link); | |
f51dcd0f AV |
160 | free_inode_nonrcu(inode); |
161 | } | |
162 | ||
a481f4d9 JJ |
163 | static const struct super_operations aafs_super_ops = { |
164 | .statfs = simple_statfs, | |
27afa27d | 165 | .free_inode = aafs_free_inode, |
a481f4d9 JJ |
166 | .show_path = aafs_show_path, |
167 | }; | |
168 | ||
b0ecc9da | 169 | static int apparmorfs_fill_super(struct super_block *sb, struct fs_context *fc) |
a481f4d9 JJ |
170 | { |
171 | static struct tree_descr files[] = { {""} }; | |
172 | int error; | |
173 | ||
174 | error = simple_fill_super(sb, AAFS_MAGIC, files); | |
175 | if (error) | |
176 | return error; | |
177 | sb->s_op = &aafs_super_ops; | |
178 | ||
179 | return 0; | |
180 | } | |
181 | ||
b0ecc9da | 182 | static int apparmorfs_get_tree(struct fs_context *fc) |
a481f4d9 | 183 | { |
b0ecc9da DH |
184 | return get_tree_single(fc, apparmorfs_fill_super); |
185 | } | |
186 | ||
187 | static const struct fs_context_operations apparmorfs_context_ops = { | |
188 | .get_tree = apparmorfs_get_tree, | |
189 | }; | |
190 | ||
191 | static int apparmorfs_init_fs_context(struct fs_context *fc) | |
192 | { | |
193 | fc->ops = &apparmorfs_context_ops; | |
194 | return 0; | |
a481f4d9 JJ |
195 | } |
196 | ||
197 | static struct file_system_type aafs_ops = { | |
198 | .owner = THIS_MODULE, | |
199 | .name = AAFS_NAME, | |
b0ecc9da | 200 | .init_fs_context = apparmorfs_init_fs_context, |
a481f4d9 JJ |
201 | .kill_sb = kill_anon_super, |
202 | }; | |
203 | ||
204 | /** | |
205 | * __aafs_setup_d_inode - basic inode setup for apparmorfs | |
206 | * @dir: parent directory for the dentry | |
207 | * @dentry: dentry we are seting the inode up for | |
208 | * @mode: permissions the file should have | |
209 | * @data: data to store on inode.i_private, available in open() | |
210 | * @link: if symlink, symlink target string | |
211 | * @fops: struct file_operations that should be used | |
212 | * @iops: struct of inode_operations that should be used | |
213 | */ | |
214 | static int __aafs_setup_d_inode(struct inode *dir, struct dentry *dentry, | |
215 | umode_t mode, void *data, char *link, | |
216 | const struct file_operations *fops, | |
217 | const struct inode_operations *iops) | |
218 | { | |
219 | struct inode *inode = new_inode(dir->i_sb); | |
220 | ||
221 | AA_BUG(!dir); | |
222 | AA_BUG(!dentry); | |
223 | ||
224 | if (!inode) | |
225 | return -ENOMEM; | |
226 | ||
227 | inode->i_ino = get_next_ino(); | |
228 | inode->i_mode = mode; | |
6ac54226 | 229 | inode->i_atime = inode->i_mtime = inode_set_ctime_current(inode); |
a481f4d9 JJ |
230 | inode->i_private = data; |
231 | if (S_ISDIR(mode)) { | |
232 | inode->i_op = iops ? iops : &simple_dir_inode_operations; | |
233 | inode->i_fop = &simple_dir_operations; | |
234 | inc_nlink(inode); | |
235 | inc_nlink(dir); | |
236 | } else if (S_ISLNK(mode)) { | |
237 | inode->i_op = iops ? iops : &simple_symlink_inode_operations; | |
238 | inode->i_link = link; | |
239 | } else { | |
240 | inode->i_fop = fops; | |
241 | } | |
242 | d_instantiate(dentry, inode); | |
243 | dget(dentry); | |
244 | ||
245 | return 0; | |
246 | } | |
247 | ||
248 | /** | |
249 | * aafs_create - create a dentry in the apparmorfs filesystem | |
250 | * | |
251 | * @name: name of dentry to create | |
252 | * @mode: permissions the file should have | |
253 | * @parent: parent directory for this dentry | |
254 | * @data: data to store on inode.i_private, available in open() | |
255 | * @link: if symlink, symlink target string | |
256 | * @fops: struct file_operations that should be used for | |
257 | * @iops: struct of inode_operations that should be used | |
258 | * | |
259 | * This is the basic "create a xxx" function for apparmorfs. | |
260 | * | |
261 | * Returns a pointer to a dentry if it succeeds, that must be free with | |
262 | * aafs_remove(). Will return ERR_PTR on failure. | |
263 | */ | |
264 | static struct dentry *aafs_create(const char *name, umode_t mode, | |
265 | struct dentry *parent, void *data, void *link, | |
266 | const struct file_operations *fops, | |
267 | const struct inode_operations *iops) | |
268 | { | |
269 | struct dentry *dentry; | |
270 | struct inode *dir; | |
271 | int error; | |
272 | ||
273 | AA_BUG(!name); | |
274 | AA_BUG(!parent); | |
275 | ||
276 | if (!(mode & S_IFMT)) | |
277 | mode = (mode & S_IALLUGO) | S_IFREG; | |
278 | ||
279 | error = simple_pin_fs(&aafs_ops, &aafs_mnt, &aafs_count); | |
280 | if (error) | |
281 | return ERR_PTR(error); | |
282 | ||
283 | dir = d_inode(parent); | |
284 | ||
285 | inode_lock(dir); | |
286 | dentry = lookup_one_len(name, parent, strlen(name)); | |
5d314a81 DC |
287 | if (IS_ERR(dentry)) { |
288 | error = PTR_ERR(dentry); | |
a481f4d9 | 289 | goto fail_lock; |
5d314a81 | 290 | } |
a481f4d9 JJ |
291 | |
292 | if (d_really_is_positive(dentry)) { | |
293 | error = -EEXIST; | |
294 | goto fail_dentry; | |
295 | } | |
296 | ||
297 | error = __aafs_setup_d_inode(dir, dentry, mode, data, link, fops, iops); | |
298 | if (error) | |
299 | goto fail_dentry; | |
300 | inode_unlock(dir); | |
301 | ||
302 | return dentry; | |
303 | ||
304 | fail_dentry: | |
305 | dput(dentry); | |
306 | ||
307 | fail_lock: | |
308 | inode_unlock(dir); | |
309 | simple_release_fs(&aafs_mnt, &aafs_count); | |
310 | ||
311 | return ERR_PTR(error); | |
312 | } | |
313 | ||
314 | /** | |
315 | * aafs_create_file - create a file in the apparmorfs filesystem | |
316 | * | |
317 | * @name: name of dentry to create | |
318 | * @mode: permissions the file should have | |
319 | * @parent: parent directory for this dentry | |
320 | * @data: data to store on inode.i_private, available in open() | |
321 | * @fops: struct file_operations that should be used for | |
322 | * | |
323 | * see aafs_create | |
324 | */ | |
325 | static struct dentry *aafs_create_file(const char *name, umode_t mode, | |
326 | struct dentry *parent, void *data, | |
327 | const struct file_operations *fops) | |
328 | { | |
329 | return aafs_create(name, mode, parent, data, NULL, fops, NULL); | |
330 | } | |
331 | ||
332 | /** | |
333 | * aafs_create_dir - create a directory in the apparmorfs filesystem | |
334 | * | |
335 | * @name: name of dentry to create | |
336 | * @parent: parent directory for this dentry | |
337 | * | |
338 | * see aafs_create | |
339 | */ | |
340 | static struct dentry *aafs_create_dir(const char *name, struct dentry *parent) | |
341 | { | |
342 | return aafs_create(name, S_IFDIR | 0755, parent, NULL, NULL, NULL, | |
343 | NULL); | |
344 | } | |
345 | ||
a481f4d9 JJ |
346 | /** |
347 | * aafs_remove - removes a file or directory from the apparmorfs filesystem | |
348 | * | |
349 | * @dentry: dentry of the file/directory/symlink to removed. | |
350 | */ | |
351 | static void aafs_remove(struct dentry *dentry) | |
352 | { | |
353 | struct inode *dir; | |
354 | ||
355 | if (!dentry || IS_ERR(dentry)) | |
356 | return; | |
357 | ||
358 | dir = d_inode(dentry->d_parent); | |
359 | inode_lock(dir); | |
360 | if (simple_positive(dentry)) { | |
361 | if (d_is_dir(dentry)) | |
362 | simple_rmdir(dir, dentry); | |
363 | else | |
364 | simple_unlink(dir, dentry); | |
201218e4 | 365 | d_delete(dentry); |
a481f4d9 JJ |
366 | dput(dentry); |
367 | } | |
368 | inode_unlock(dir); | |
369 | simple_release_fs(&aafs_mnt, &aafs_count); | |
370 | } | |
371 | ||
372 | ||
373 | /* | |
374 | * aa_fs - policy load/replace/remove | |
375 | */ | |
376 | ||
63e2b423 JJ |
377 | /** |
378 | * aa_simple_write_to_buffer - common routine for getting policy from user | |
63e2b423 | 379 | * @userbuf: user buffer to copy data from (NOT NULL) |
3ed02ada | 380 | * @alloc_size: size of user buffer (REQUIRES: @alloc_size >= @copy_size) |
63e2b423 JJ |
381 | * @copy_size: size of data to copy from user buffer |
382 | * @pos: position write is at in the file (NOT NULL) | |
383 | * | |
384 | * Returns: kernel buffer containing copy of user buffer data or an | |
385 | * ERR_PTR on failure. | |
386 | */ | |
5ef50d01 | 387 | static struct aa_loaddata *aa_simple_write_to_buffer(const char __user *userbuf, |
5ac8c355 JJ |
388 | size_t alloc_size, |
389 | size_t copy_size, | |
390 | loff_t *pos) | |
63e2b423 | 391 | { |
5ac8c355 | 392 | struct aa_loaddata *data; |
63e2b423 | 393 | |
e6bfa25d | 394 | AA_BUG(copy_size > alloc_size); |
3ed02ada | 395 | |
63e2b423 JJ |
396 | if (*pos != 0) |
397 | /* only writes from pos 0, that is complete writes */ | |
398 | return ERR_PTR(-ESPIPE); | |
399 | ||
63e2b423 | 400 | /* freed by caller to simple_write_to_buffer */ |
5d5182ca JJ |
401 | data = aa_loaddata_alloc(alloc_size); |
402 | if (IS_ERR(data)) | |
403 | return data; | |
63e2b423 | 404 | |
5d5182ca | 405 | data->size = copy_size; |
5ac8c355 | 406 | if (copy_from_user(data->data, userbuf, copy_size)) { |
417ea9fe | 407 | aa_put_loaddata(data); |
63e2b423 JJ |
408 | return ERR_PTR(-EFAULT); |
409 | } | |
410 | ||
411 | return data; | |
412 | } | |
413 | ||
18e99f19 | 414 | static ssize_t policy_update(u32 mask, const char __user *buf, size_t size, |
b7fd2c03 | 415 | loff_t *pos, struct aa_ns *ns) |
63e2b423 | 416 | { |
5ac8c355 | 417 | struct aa_loaddata *data; |
637f688d JJ |
418 | struct aa_label *label; |
419 | ssize_t error; | |
cf797c0e | 420 | |
637f688d | 421 | label = begin_current_label_crit_section(); |
cf797c0e | 422 | |
5ac8c355 JJ |
423 | /* high level check about policy management - fine grained in |
424 | * below after unpack | |
425 | */ | |
637f688d | 426 | error = aa_may_manage_policy(label, ns, mask); |
5ac8c355 | 427 | if (error) |
c6b39f07 | 428 | goto end_section; |
63e2b423 | 429 | |
5ef50d01 | 430 | data = aa_simple_write_to_buffer(buf, size, size, pos); |
63e2b423 JJ |
431 | error = PTR_ERR(data); |
432 | if (!IS_ERR(data)) { | |
637f688d | 433 | error = aa_replace_profiles(ns, label, mask, data); |
5ac8c355 | 434 | aa_put_loaddata(data); |
63e2b423 | 435 | } |
c6b39f07 | 436 | end_section: |
637f688d | 437 | end_current_label_crit_section(label); |
63e2b423 JJ |
438 | |
439 | return error; | |
440 | } | |
441 | ||
b7fd2c03 | 442 | /* .load file hook fn to load policy */ |
5ac8c355 JJ |
443 | static ssize_t profile_load(struct file *f, const char __user *buf, size_t size, |
444 | loff_t *pos) | |
445 | { | |
b7fd2c03 | 446 | struct aa_ns *ns = aa_get_ns(f->f_inode->i_private); |
18e99f19 | 447 | int error = policy_update(AA_MAY_LOAD_POLICY, buf, size, pos, ns); |
b7fd2c03 JJ |
448 | |
449 | aa_put_ns(ns); | |
5ac8c355 JJ |
450 | |
451 | return error; | |
452 | } | |
453 | ||
63e2b423 | 454 | static const struct file_operations aa_fs_profile_load = { |
6038f373 AB |
455 | .write = profile_load, |
456 | .llseek = default_llseek, | |
63e2b423 JJ |
457 | }; |
458 | ||
459 | /* .replace file hook fn to load and/or replace policy */ | |
460 | static ssize_t profile_replace(struct file *f, const char __user *buf, | |
461 | size_t size, loff_t *pos) | |
462 | { | |
b7fd2c03 | 463 | struct aa_ns *ns = aa_get_ns(f->f_inode->i_private); |
18e99f19 JJ |
464 | int error = policy_update(AA_MAY_LOAD_POLICY | AA_MAY_REPLACE_POLICY, |
465 | buf, size, pos, ns); | |
b7fd2c03 | 466 | aa_put_ns(ns); |
63e2b423 JJ |
467 | |
468 | return error; | |
469 | } | |
470 | ||
471 | static const struct file_operations aa_fs_profile_replace = { | |
6038f373 AB |
472 | .write = profile_replace, |
473 | .llseek = default_llseek, | |
63e2b423 JJ |
474 | }; |
475 | ||
b7fd2c03 | 476 | /* .remove file hook fn to remove loaded policy */ |
63e2b423 JJ |
477 | static ssize_t profile_remove(struct file *f, const char __user *buf, |
478 | size_t size, loff_t *pos) | |
479 | { | |
5ac8c355 | 480 | struct aa_loaddata *data; |
637f688d | 481 | struct aa_label *label; |
63e2b423 | 482 | ssize_t error; |
b7fd2c03 | 483 | struct aa_ns *ns = aa_get_ns(f->f_inode->i_private); |
63e2b423 | 484 | |
637f688d | 485 | label = begin_current_label_crit_section(); |
5ac8c355 JJ |
486 | /* high level check about policy management - fine grained in |
487 | * below after unpack | |
488 | */ | |
637f688d | 489 | error = aa_may_manage_policy(label, ns, AA_MAY_REMOVE_POLICY); |
5ac8c355 JJ |
490 | if (error) |
491 | goto out; | |
492 | ||
63e2b423 JJ |
493 | /* |
494 | * aa_remove_profile needs a null terminated string so 1 extra | |
495 | * byte is allocated and the copied data is null terminated. | |
496 | */ | |
5ef50d01 | 497 | data = aa_simple_write_to_buffer(buf, size + 1, size, pos); |
63e2b423 JJ |
498 | |
499 | error = PTR_ERR(data); | |
500 | if (!IS_ERR(data)) { | |
5ac8c355 | 501 | data->data[size] = 0; |
637f688d | 502 | error = aa_remove_profiles(ns, label, data->data, size); |
5ac8c355 | 503 | aa_put_loaddata(data); |
63e2b423 | 504 | } |
5ac8c355 | 505 | out: |
637f688d | 506 | end_current_label_crit_section(label); |
b7fd2c03 | 507 | aa_put_ns(ns); |
63e2b423 JJ |
508 | return error; |
509 | } | |
510 | ||
511 | static const struct file_operations aa_fs_profile_remove = { | |
6038f373 AB |
512 | .write = profile_remove, |
513 | .llseek = default_llseek, | |
63e2b423 JJ |
514 | }; |
515 | ||
d9bf2c26 JJ |
516 | struct aa_revision { |
517 | struct aa_ns *ns; | |
518 | long last_read; | |
519 | }; | |
520 | ||
521 | /* revision file hook fn for policy loads */ | |
522 | static int ns_revision_release(struct inode *inode, struct file *file) | |
523 | { | |
524 | struct aa_revision *rev = file->private_data; | |
525 | ||
526 | if (rev) { | |
527 | aa_put_ns(rev->ns); | |
528 | kfree(rev); | |
529 | } | |
530 | ||
531 | return 0; | |
532 | } | |
533 | ||
534 | static ssize_t ns_revision_read(struct file *file, char __user *buf, | |
535 | size_t size, loff_t *ppos) | |
536 | { | |
537 | struct aa_revision *rev = file->private_data; | |
538 | char buffer[32]; | |
539 | long last_read; | |
540 | int avail; | |
541 | ||
feb3c766 | 542 | mutex_lock_nested(&rev->ns->lock, rev->ns->level); |
d9bf2c26 JJ |
543 | last_read = rev->last_read; |
544 | if (last_read == rev->ns->revision) { | |
545 | mutex_unlock(&rev->ns->lock); | |
546 | if (file->f_flags & O_NONBLOCK) | |
547 | return -EAGAIN; | |
548 | if (wait_event_interruptible(rev->ns->wait, | |
549 | last_read != | |
550 | READ_ONCE(rev->ns->revision))) | |
551 | return -ERESTARTSYS; | |
feb3c766 | 552 | mutex_lock_nested(&rev->ns->lock, rev->ns->level); |
d9bf2c26 JJ |
553 | } |
554 | ||
555 | avail = sprintf(buffer, "%ld\n", rev->ns->revision); | |
556 | if (*ppos + size > avail) { | |
557 | rev->last_read = rev->ns->revision; | |
558 | *ppos = 0; | |
559 | } | |
560 | mutex_unlock(&rev->ns->lock); | |
561 | ||
562 | return simple_read_from_buffer(buf, size, ppos, buffer, avail); | |
563 | } | |
564 | ||
565 | static int ns_revision_open(struct inode *inode, struct file *file) | |
566 | { | |
567 | struct aa_revision *rev = kzalloc(sizeof(*rev), GFP_KERNEL); | |
568 | ||
569 | if (!rev) | |
570 | return -ENOMEM; | |
571 | ||
572 | rev->ns = aa_get_ns(inode->i_private); | |
573 | if (!rev->ns) | |
574 | rev->ns = aa_get_current_ns(); | |
575 | file->private_data = rev; | |
576 | ||
577 | return 0; | |
578 | } | |
579 | ||
e6c5a7d9 | 580 | static __poll_t ns_revision_poll(struct file *file, poll_table *pt) |
d9bf2c26 JJ |
581 | { |
582 | struct aa_revision *rev = file->private_data; | |
e6c5a7d9 | 583 | __poll_t mask = 0; |
d9bf2c26 JJ |
584 | |
585 | if (rev) { | |
feb3c766 | 586 | mutex_lock_nested(&rev->ns->lock, rev->ns->level); |
d9bf2c26 JJ |
587 | poll_wait(file, &rev->ns->wait, pt); |
588 | if (rev->last_read < rev->ns->revision) | |
a9a08845 | 589 | mask |= EPOLLIN | EPOLLRDNORM; |
d9bf2c26 JJ |
590 | mutex_unlock(&rev->ns->lock); |
591 | } | |
592 | ||
593 | return mask; | |
594 | } | |
595 | ||
5d5182ca JJ |
596 | void __aa_bump_ns_revision(struct aa_ns *ns) |
597 | { | |
0df34a64 | 598 | WRITE_ONCE(ns->revision, READ_ONCE(ns->revision) + 1); |
d9bf2c26 | 599 | wake_up_interruptible(&ns->wait); |
5d5182ca JJ |
600 | } |
601 | ||
d9bf2c26 JJ |
602 | static const struct file_operations aa_fs_ns_revision_fops = { |
603 | .owner = THIS_MODULE, | |
604 | .open = ns_revision_open, | |
605 | .poll = ns_revision_poll, | |
606 | .read = ns_revision_read, | |
607 | .llseek = generic_file_llseek, | |
608 | .release = ns_revision_release, | |
609 | }; | |
610 | ||
4f3b3f2d JJ |
611 | static void profile_query_cb(struct aa_profile *profile, struct aa_perms *perms, |
612 | const char *match_str, size_t match_len) | |
613 | { | |
1ad22fcc JJ |
614 | struct aa_ruleset *rules = list_first_entry(&profile->rules, |
615 | typeof(*rules), list); | |
f4585bc2 | 616 | struct aa_perms tmp = { }; |
33fc95d8 | 617 | aa_state_t state = DFA_NOMATCH; |
4f3b3f2d | 618 | |
637f688d | 619 | if (profile_unconfined(profile)) |
4f3b3f2d | 620 | return; |
217af7e2 JJ |
621 | if (rules->file.dfa && *match_str == AA_CLASS_FILE) { |
622 | state = aa_dfa_match_len(rules->file.dfa, | |
623 | rules->file.start[AA_CLASS_FILE], | |
4f3b3f2d | 624 | match_str + 1, match_len - 1); |
4f3b3f2d JJ |
625 | if (state) { |
626 | struct path_cond cond = { }; | |
627 | ||
217af7e2 | 628 | tmp = *(aa_lookup_fperms(&(rules->file), state, &cond)); |
4f3b3f2d | 629 | } |
217af7e2 JJ |
630 | } else if (rules->policy.dfa) { |
631 | if (!RULE_MEDIATES(rules, *match_str)) | |
4f3b3f2d | 632 | return; /* no change to current perms */ |
217af7e2 JJ |
633 | state = aa_dfa_match_len(rules->policy.dfa, |
634 | rules->policy.start[0], | |
4f3b3f2d JJ |
635 | match_str, match_len); |
636 | if (state) | |
217af7e2 | 637 | tmp = *aa_lookup_perms(&rules->policy, state); |
4f3b3f2d JJ |
638 | } |
639 | aa_apply_modes_to_perms(profile, &tmp); | |
317d9a05 | 640 | aa_perms_accum_raw(perms, &tmp); |
4f3b3f2d JJ |
641 | } |
642 | ||
643 | ||
e025be0f WH |
644 | /** |
645 | * query_data - queries a policy and writes its data to buf | |
646 | * @buf: the resulting data is stored here (NOT NULL) | |
647 | * @buf_len: size of buf | |
648 | * @query: query string used to retrieve data | |
649 | * @query_len: size of query including second NUL byte | |
650 | * | |
651 | * The buffers pointed to by buf and query may overlap. The query buffer is | |
652 | * parsed before buf is written to. | |
653 | * | |
654 | * The query should look like "<LABEL>\0<KEY>\0", where <LABEL> is the name of | |
655 | * the security confinement context and <KEY> is the name of the data to | |
656 | * retrieve. <LABEL> and <KEY> must not be NUL-terminated. | |
657 | * | |
658 | * Don't expect the contents of buf to be preserved on failure. | |
659 | * | |
660 | * Returns: number of characters written to buf or -errno on failure | |
661 | */ | |
662 | static ssize_t query_data(char *buf, size_t buf_len, | |
663 | char *query, size_t query_len) | |
664 | { | |
665 | char *out; | |
666 | const char *key; | |
317d9a05 | 667 | struct label_it i; |
637f688d | 668 | struct aa_label *label, *curr; |
317d9a05 | 669 | struct aa_profile *profile; |
e025be0f WH |
670 | struct aa_data *data; |
671 | u32 bytes, blocks; | |
672 | __le32 outle32; | |
673 | ||
674 | if (!query_len) | |
675 | return -EINVAL; /* need a query */ | |
676 | ||
677 | key = query + strnlen(query, query_len) + 1; | |
678 | if (key + 1 >= query + query_len) | |
679 | return -EINVAL; /* not enough space for a non-empty key */ | |
680 | if (key + strnlen(key, query + query_len - key) >= query + query_len) | |
681 | return -EINVAL; /* must end with NUL */ | |
682 | ||
683 | if (buf_len < sizeof(bytes) + sizeof(blocks)) | |
684 | return -EINVAL; /* not enough space */ | |
685 | ||
637f688d JJ |
686 | curr = begin_current_label_crit_section(); |
687 | label = aa_label_parse(curr, query, GFP_KERNEL, false, false); | |
688 | end_current_label_crit_section(curr); | |
689 | if (IS_ERR(label)) | |
690 | return PTR_ERR(label); | |
e025be0f WH |
691 | |
692 | /* We are going to leave space for two numbers. The first is the total | |
693 | * number of bytes we are writing after the first number. This is so | |
694 | * users can read the full output without reallocation. | |
695 | * | |
696 | * The second number is the number of data blocks we're writing. An | |
697 | * application might be confined by multiple policies having data in | |
698 | * the same key. | |
699 | */ | |
700 | memset(buf, 0, sizeof(bytes) + sizeof(blocks)); | |
701 | out = buf + sizeof(bytes) + sizeof(blocks); | |
702 | ||
703 | blocks = 0; | |
317d9a05 JJ |
704 | label_for_each_confined(i, label, profile) { |
705 | if (!profile->data) | |
706 | continue; | |
707 | ||
708 | data = rhashtable_lookup_fast(profile->data, &key, | |
709 | profile->data->p); | |
e025be0f WH |
710 | |
711 | if (data) { | |
317d9a05 JJ |
712 | if (out + sizeof(outle32) + data->size > buf + |
713 | buf_len) { | |
637f688d | 714 | aa_put_label(label); |
e025be0f | 715 | return -EINVAL; /* not enough space */ |
637f688d | 716 | } |
e025be0f WH |
717 | outle32 = __cpu_to_le32(data->size); |
718 | memcpy(out, &outle32, sizeof(outle32)); | |
719 | out += sizeof(outle32); | |
720 | memcpy(out, data->data, data->size); | |
721 | out += data->size; | |
722 | blocks++; | |
723 | } | |
724 | } | |
637f688d | 725 | aa_put_label(label); |
e025be0f WH |
726 | |
727 | outle32 = __cpu_to_le32(out - buf - sizeof(bytes)); | |
728 | memcpy(buf, &outle32, sizeof(outle32)); | |
729 | outle32 = __cpu_to_le32(blocks); | |
730 | memcpy(buf + sizeof(bytes), &outle32, sizeof(outle32)); | |
731 | ||
732 | return out - buf; | |
733 | } | |
734 | ||
4f3b3f2d JJ |
735 | /** |
736 | * query_label - queries a label and writes permissions to buf | |
737 | * @buf: the resulting permissions string is stored here (NOT NULL) | |
738 | * @buf_len: size of buf | |
739 | * @query: binary query string to match against the dfa | |
740 | * @query_len: size of query | |
741 | * @view_only: only compute for querier's view | |
742 | * | |
743 | * The buffers pointed to by buf and query may overlap. The query buffer is | |
744 | * parsed before buf is written to. | |
745 | * | |
746 | * The query should look like "LABEL_NAME\0DFA_STRING" where LABEL_NAME is | |
747 | * the name of the label, in the current namespace, that is to be queried and | |
748 | * DFA_STRING is a binary string to match against the label(s)'s DFA. | |
749 | * | |
750 | * LABEL_NAME must be NUL terminated. DFA_STRING may contain NUL characters | |
751 | * but must *not* be NUL terminated. | |
752 | * | |
753 | * Returns: number of characters written to buf or -errno on failure | |
754 | */ | |
755 | static ssize_t query_label(char *buf, size_t buf_len, | |
756 | char *query, size_t query_len, bool view_only) | |
757 | { | |
317d9a05 | 758 | struct aa_profile *profile; |
637f688d | 759 | struct aa_label *label, *curr; |
4f3b3f2d JJ |
760 | char *label_name, *match_str; |
761 | size_t label_name_len, match_len; | |
762 | struct aa_perms perms; | |
317d9a05 | 763 | struct label_it i; |
4f3b3f2d JJ |
764 | |
765 | if (!query_len) | |
766 | return -EINVAL; | |
767 | ||
768 | label_name = query; | |
769 | label_name_len = strnlen(query, query_len); | |
770 | if (!label_name_len || label_name_len == query_len) | |
771 | return -EINVAL; | |
772 | ||
773 | /** | |
774 | * The extra byte is to account for the null byte between the | |
775 | * profile name and dfa string. profile_name_len is greater | |
776 | * than zero and less than query_len, so a byte can be safely | |
777 | * added or subtracted. | |
778 | */ | |
779 | match_str = label_name + label_name_len + 1; | |
780 | match_len = query_len - label_name_len - 1; | |
781 | ||
637f688d JJ |
782 | curr = begin_current_label_crit_section(); |
783 | label = aa_label_parse(curr, label_name, GFP_KERNEL, false, false); | |
784 | end_current_label_crit_section(curr); | |
785 | if (IS_ERR(label)) | |
786 | return PTR_ERR(label); | |
4f3b3f2d JJ |
787 | |
788 | perms = allperms; | |
317d9a05 JJ |
789 | if (view_only) { |
790 | label_for_each_in_ns(i, labels_ns(label), label, profile) { | |
791 | profile_query_cb(profile, &perms, match_str, match_len); | |
792 | } | |
793 | } else { | |
794 | label_for_each(i, label, profile) { | |
795 | profile_query_cb(profile, &perms, match_str, match_len); | |
796 | } | |
797 | } | |
798 | aa_put_label(label); | |
4f3b3f2d JJ |
799 | |
800 | return scnprintf(buf, buf_len, | |
801 | "allow 0x%08x\ndeny 0x%08x\naudit 0x%08x\nquiet 0x%08x\n", | |
802 | perms.allow, perms.deny, perms.audit, perms.quiet); | |
803 | } | |
804 | ||
1dea3b41 JJ |
805 | /* |
806 | * Transaction based IO. | |
807 | * The file expects a write which triggers the transaction, and then | |
808 | * possibly a read(s) which collects the result - which is stored in a | |
809 | * file-local buffer. Once a new write is performed, a new set of results | |
810 | * are stored in the file-local buffer. | |
811 | */ | |
812 | struct multi_transaction { | |
813 | struct kref count; | |
814 | ssize_t size; | |
fe9fd23e | 815 | char data[]; |
1dea3b41 JJ |
816 | }; |
817 | ||
818 | #define MULTI_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct multi_transaction)) | |
1dea3b41 JJ |
819 | |
820 | static void multi_transaction_kref(struct kref *kref) | |
821 | { | |
822 | struct multi_transaction *t; | |
823 | ||
824 | t = container_of(kref, struct multi_transaction, count); | |
825 | free_page((unsigned long) t); | |
826 | } | |
827 | ||
828 | static struct multi_transaction * | |
829 | get_multi_transaction(struct multi_transaction *t) | |
830 | { | |
831 | if (t) | |
832 | kref_get(&(t->count)); | |
833 | ||
834 | return t; | |
835 | } | |
836 | ||
837 | static void put_multi_transaction(struct multi_transaction *t) | |
838 | { | |
839 | if (t) | |
840 | kref_put(&(t->count), multi_transaction_kref); | |
841 | } | |
842 | ||
843 | /* does not increment @new's count */ | |
844 | static void multi_transaction_set(struct file *file, | |
845 | struct multi_transaction *new, size_t n) | |
846 | { | |
847 | struct multi_transaction *old; | |
848 | ||
849 | AA_BUG(n > MULTI_TRANSACTION_LIMIT); | |
850 | ||
851 | new->size = n; | |
d0d845a7 | 852 | spin_lock(&file->f_lock); |
1dea3b41 JJ |
853 | old = (struct multi_transaction *) file->private_data; |
854 | file->private_data = new; | |
d0d845a7 | 855 | spin_unlock(&file->f_lock); |
1dea3b41 JJ |
856 | put_multi_transaction(old); |
857 | } | |
858 | ||
859 | static struct multi_transaction *multi_transaction_new(struct file *file, | |
860 | const char __user *buf, | |
861 | size_t size) | |
862 | { | |
863 | struct multi_transaction *t; | |
864 | ||
865 | if (size > MULTI_TRANSACTION_LIMIT - 1) | |
866 | return ERR_PTR(-EFBIG); | |
867 | ||
868 | t = (struct multi_transaction *)get_zeroed_page(GFP_KERNEL); | |
869 | if (!t) | |
870 | return ERR_PTR(-ENOMEM); | |
871 | kref_init(&t->count); | |
c73275cf GC |
872 | if (copy_from_user(t->data, buf, size)) { |
873 | put_multi_transaction(t); | |
1dea3b41 | 874 | return ERR_PTR(-EFAULT); |
c73275cf | 875 | } |
1dea3b41 JJ |
876 | |
877 | return t; | |
878 | } | |
879 | ||
880 | static ssize_t multi_transaction_read(struct file *file, char __user *buf, | |
881 | size_t size, loff_t *pos) | |
882 | { | |
883 | struct multi_transaction *t; | |
884 | ssize_t ret; | |
885 | ||
d0d845a7 | 886 | spin_lock(&file->f_lock); |
1dea3b41 | 887 | t = get_multi_transaction(file->private_data); |
d0d845a7 HM |
888 | spin_unlock(&file->f_lock); |
889 | ||
1dea3b41 JJ |
890 | if (!t) |
891 | return 0; | |
892 | ||
893 | ret = simple_read_from_buffer(buf, size, pos, t->data, t->size); | |
894 | put_multi_transaction(t); | |
895 | ||
896 | return ret; | |
897 | } | |
898 | ||
899 | static int multi_transaction_release(struct inode *inode, struct file *file) | |
900 | { | |
901 | put_multi_transaction(file->private_data); | |
902 | ||
903 | return 0; | |
904 | } | |
905 | ||
317d9a05 JJ |
906 | #define QUERY_CMD_LABEL "label\0" |
907 | #define QUERY_CMD_LABEL_LEN 6 | |
4f3b3f2d JJ |
908 | #define QUERY_CMD_PROFILE "profile\0" |
909 | #define QUERY_CMD_PROFILE_LEN 8 | |
317d9a05 JJ |
910 | #define QUERY_CMD_LABELALL "labelall\0" |
911 | #define QUERY_CMD_LABELALL_LEN 9 | |
e025be0f WH |
912 | #define QUERY_CMD_DATA "data\0" |
913 | #define QUERY_CMD_DATA_LEN 5 | |
914 | ||
915 | /** | |
916 | * aa_write_access - generic permissions and data query | |
917 | * @file: pointer to open apparmorfs/access file | |
918 | * @ubuf: user buffer containing the complete query string (NOT NULL) | |
919 | * @count: size of ubuf | |
920 | * @ppos: position in the file (MUST BE ZERO) | |
921 | * | |
922 | * Allows for one permissions or data query per open(), write(), and read() | |
923 | * sequence. The only queries currently supported are label-based queries for | |
924 | * permissions or data. | |
925 | * | |
926 | * For permissions queries, ubuf must begin with "label\0", followed by the | |
927 | * profile query specific format described in the query_label() function | |
928 | * documentation. | |
929 | * | |
930 | * For data queries, ubuf must have the form "data\0<LABEL>\0<KEY>\0", where | |
931 | * <LABEL> is the name of the security confinement context and <KEY> is the | |
932 | * name of the data to retrieve. | |
933 | * | |
934 | * Returns: number of bytes written or -errno on failure | |
935 | */ | |
936 | static ssize_t aa_write_access(struct file *file, const char __user *ubuf, | |
937 | size_t count, loff_t *ppos) | |
938 | { | |
1dea3b41 | 939 | struct multi_transaction *t; |
e025be0f WH |
940 | ssize_t len; |
941 | ||
942 | if (*ppos) | |
943 | return -ESPIPE; | |
944 | ||
1dea3b41 JJ |
945 | t = multi_transaction_new(file, ubuf, count); |
946 | if (IS_ERR(t)) | |
947 | return PTR_ERR(t); | |
e025be0f | 948 | |
4f3b3f2d JJ |
949 | if (count > QUERY_CMD_PROFILE_LEN && |
950 | !memcmp(t->data, QUERY_CMD_PROFILE, QUERY_CMD_PROFILE_LEN)) { | |
951 | len = query_label(t->data, MULTI_TRANSACTION_LIMIT, | |
952 | t->data + QUERY_CMD_PROFILE_LEN, | |
953 | count - QUERY_CMD_PROFILE_LEN, true); | |
317d9a05 JJ |
954 | } else if (count > QUERY_CMD_LABEL_LEN && |
955 | !memcmp(t->data, QUERY_CMD_LABEL, QUERY_CMD_LABEL_LEN)) { | |
956 | len = query_label(t->data, MULTI_TRANSACTION_LIMIT, | |
957 | t->data + QUERY_CMD_LABEL_LEN, | |
958 | count - QUERY_CMD_LABEL_LEN, true); | |
959 | } else if (count > QUERY_CMD_LABELALL_LEN && | |
960 | !memcmp(t->data, QUERY_CMD_LABELALL, | |
961 | QUERY_CMD_LABELALL_LEN)) { | |
962 | len = query_label(t->data, MULTI_TRANSACTION_LIMIT, | |
963 | t->data + QUERY_CMD_LABELALL_LEN, | |
964 | count - QUERY_CMD_LABELALL_LEN, false); | |
4f3b3f2d | 965 | } else if (count > QUERY_CMD_DATA_LEN && |
1dea3b41 JJ |
966 | !memcmp(t->data, QUERY_CMD_DATA, QUERY_CMD_DATA_LEN)) { |
967 | len = query_data(t->data, MULTI_TRANSACTION_LIMIT, | |
968 | t->data + QUERY_CMD_DATA_LEN, | |
e025be0f WH |
969 | count - QUERY_CMD_DATA_LEN); |
970 | } else | |
971 | len = -EINVAL; | |
972 | ||
1dea3b41 JJ |
973 | if (len < 0) { |
974 | put_multi_transaction(t); | |
e025be0f | 975 | return len; |
1dea3b41 | 976 | } |
e025be0f | 977 | |
1dea3b41 | 978 | multi_transaction_set(file, t, len); |
e025be0f WH |
979 | |
980 | return count; | |
981 | } | |
982 | ||
c97204ba | 983 | static const struct file_operations aa_sfs_access = { |
e025be0f | 984 | .write = aa_write_access, |
1dea3b41 JJ |
985 | .read = multi_transaction_read, |
986 | .release = multi_transaction_release, | |
e025be0f WH |
987 | .llseek = generic_file_llseek, |
988 | }; | |
989 | ||
c97204ba | 990 | static int aa_sfs_seq_show(struct seq_file *seq, void *v) |
e74abcf3 | 991 | { |
c97204ba | 992 | struct aa_sfs_entry *fs_file = seq->private; |
e74abcf3 KC |
993 | |
994 | if (!fs_file) | |
995 | return 0; | |
996 | ||
997 | switch (fs_file->v_type) { | |
c97204ba | 998 | case AA_SFS_TYPE_BOOLEAN: |
e74abcf3 KC |
999 | seq_printf(seq, "%s\n", fs_file->v.boolean ? "yes" : "no"); |
1000 | break; | |
c97204ba | 1001 | case AA_SFS_TYPE_STRING: |
a9bf8e9f KC |
1002 | seq_printf(seq, "%s\n", fs_file->v.string); |
1003 | break; | |
c97204ba | 1004 | case AA_SFS_TYPE_U64: |
e74abcf3 KC |
1005 | seq_printf(seq, "%#08lx\n", fs_file->v.u64); |
1006 | break; | |
1007 | default: | |
1008 | /* Ignore unpritable entry types. */ | |
1009 | break; | |
1010 | } | |
1011 | ||
1012 | return 0; | |
1013 | } | |
1014 | ||
c97204ba | 1015 | static int aa_sfs_seq_open(struct inode *inode, struct file *file) |
e74abcf3 | 1016 | { |
c97204ba | 1017 | return single_open(file, aa_sfs_seq_show, inode->i_private); |
e74abcf3 KC |
1018 | } |
1019 | ||
c97204ba | 1020 | const struct file_operations aa_sfs_seq_file_ops = { |
e74abcf3 | 1021 | .owner = THIS_MODULE, |
c97204ba | 1022 | .open = aa_sfs_seq_open, |
e74abcf3 KC |
1023 | .read = seq_read, |
1024 | .llseek = seq_lseek, | |
1025 | .release = single_release, | |
1026 | }; | |
1027 | ||
52b97de3 JJ |
1028 | /* |
1029 | * profile based file operations | |
1030 | * policy/profiles/XXXX/profiles/ * | |
1031 | */ | |
1032 | ||
1033 | #define SEQ_PROFILE_FOPS(NAME) \ | |
1034 | static int seq_profile_ ##NAME ##_open(struct inode *inode, struct file *file)\ | |
1035 | { \ | |
1036 | return seq_profile_open(inode, file, seq_profile_ ##NAME ##_show); \ | |
1037 | } \ | |
1038 | \ | |
1039 | static const struct file_operations seq_profile_ ##NAME ##_fops = { \ | |
1040 | .owner = THIS_MODULE, \ | |
1041 | .open = seq_profile_ ##NAME ##_open, \ | |
1042 | .read = seq_read, \ | |
1043 | .llseek = seq_lseek, \ | |
1044 | .release = seq_profile_release, \ | |
1045 | } \ | |
1046 | ||
1047 | static int seq_profile_open(struct inode *inode, struct file *file, | |
1048 | int (*show)(struct seq_file *, void *)) | |
0d259f04 | 1049 | { |
8399588a JJ |
1050 | struct aa_proxy *proxy = aa_get_proxy(inode->i_private); |
1051 | int error = single_open(file, show, proxy); | |
0d259f04 JJ |
1052 | |
1053 | if (error) { | |
1054 | file->private_data = NULL; | |
8399588a | 1055 | aa_put_proxy(proxy); |
0d259f04 JJ |
1056 | } |
1057 | ||
1058 | return error; | |
1059 | } | |
1060 | ||
52b97de3 | 1061 | static int seq_profile_release(struct inode *inode, struct file *file) |
0d259f04 JJ |
1062 | { |
1063 | struct seq_file *seq = (struct seq_file *) file->private_data; | |
1064 | if (seq) | |
8399588a | 1065 | aa_put_proxy(seq->private); |
0d259f04 JJ |
1066 | return single_release(inode, file); |
1067 | } | |
1068 | ||
52b97de3 | 1069 | static int seq_profile_name_show(struct seq_file *seq, void *v) |
0d259f04 | 1070 | { |
8399588a | 1071 | struct aa_proxy *proxy = seq->private; |
637f688d JJ |
1072 | struct aa_label *label = aa_get_label_rcu(&proxy->label); |
1073 | struct aa_profile *profile = labels_profile(label); | |
0d259f04 | 1074 | seq_printf(seq, "%s\n", profile->base.name); |
637f688d | 1075 | aa_put_label(label); |
0d259f04 JJ |
1076 | |
1077 | return 0; | |
1078 | } | |
1079 | ||
52b97de3 | 1080 | static int seq_profile_mode_show(struct seq_file *seq, void *v) |
0d259f04 | 1081 | { |
8399588a | 1082 | struct aa_proxy *proxy = seq->private; |
637f688d JJ |
1083 | struct aa_label *label = aa_get_label_rcu(&proxy->label); |
1084 | struct aa_profile *profile = labels_profile(label); | |
0d259f04 | 1085 | seq_printf(seq, "%s\n", aa_profile_mode_names[profile->mode]); |
637f688d | 1086 | aa_put_label(label); |
0d259f04 JJ |
1087 | |
1088 | return 0; | |
1089 | } | |
1090 | ||
52b97de3 | 1091 | static int seq_profile_attach_show(struct seq_file *seq, void *v) |
556d0be7 | 1092 | { |
8399588a | 1093 | struct aa_proxy *proxy = seq->private; |
637f688d JJ |
1094 | struct aa_label *label = aa_get_label_rcu(&proxy->label); |
1095 | struct aa_profile *profile = labels_profile(label); | |
217af7e2 JJ |
1096 | if (profile->attach.xmatch_str) |
1097 | seq_printf(seq, "%s\n", profile->attach.xmatch_str); | |
1098 | else if (profile->attach.xmatch.dfa) | |
556d0be7 JJ |
1099 | seq_puts(seq, "<unknown>\n"); |
1100 | else | |
1101 | seq_printf(seq, "%s\n", profile->base.name); | |
637f688d | 1102 | aa_put_label(label); |
556d0be7 JJ |
1103 | |
1104 | return 0; | |
1105 | } | |
1106 | ||
52b97de3 | 1107 | static int seq_profile_hash_show(struct seq_file *seq, void *v) |
f8eb8a13 | 1108 | { |
8399588a | 1109 | struct aa_proxy *proxy = seq->private; |
637f688d JJ |
1110 | struct aa_label *label = aa_get_label_rcu(&proxy->label); |
1111 | struct aa_profile *profile = labels_profile(label); | |
f8eb8a13 JJ |
1112 | unsigned int i, size = aa_hash_size(); |
1113 | ||
1114 | if (profile->hash) { | |
1115 | for (i = 0; i < size; i++) | |
1116 | seq_printf(seq, "%.2x", profile->hash[i]); | |
47dbd1cd | 1117 | seq_putc(seq, '\n'); |
f8eb8a13 | 1118 | } |
637f688d | 1119 | aa_put_label(label); |
f8eb8a13 JJ |
1120 | |
1121 | return 0; | |
1122 | } | |
1123 | ||
52b97de3 JJ |
1124 | SEQ_PROFILE_FOPS(name); |
1125 | SEQ_PROFILE_FOPS(mode); | |
1126 | SEQ_PROFILE_FOPS(attach); | |
1127 | SEQ_PROFILE_FOPS(hash); | |
f8eb8a13 | 1128 | |
64c86970 JJ |
1129 | /* |
1130 | * namespace based files | |
1131 | * several root files and | |
1132 | * policy/ * | |
1133 | */ | |
f8eb8a13 | 1134 | |
64c86970 JJ |
1135 | #define SEQ_NS_FOPS(NAME) \ |
1136 | static int seq_ns_ ##NAME ##_open(struct inode *inode, struct file *file) \ | |
1137 | { \ | |
1138 | return single_open(file, seq_ns_ ##NAME ##_show, inode->i_private); \ | |
1139 | } \ | |
1140 | \ | |
1141 | static const struct file_operations seq_ns_ ##NAME ##_fops = { \ | |
1142 | .owner = THIS_MODULE, \ | |
1143 | .open = seq_ns_ ##NAME ##_open, \ | |
1144 | .read = seq_read, \ | |
1145 | .llseek = seq_lseek, \ | |
1146 | .release = single_release, \ | |
1147 | } \ | |
3e3e5695 | 1148 | |
40cde7fc JJ |
1149 | static int seq_ns_stacked_show(struct seq_file *seq, void *v) |
1150 | { | |
1151 | struct aa_label *label; | |
1152 | ||
1153 | label = begin_current_label_crit_section(); | |
1154 | seq_printf(seq, "%s\n", label->size > 1 ? "yes" : "no"); | |
1155 | end_current_label_crit_section(label); | |
1156 | ||
1157 | return 0; | |
1158 | } | |
1159 | ||
1160 | static int seq_ns_nsstacked_show(struct seq_file *seq, void *v) | |
1161 | { | |
1162 | struct aa_label *label; | |
1163 | struct aa_profile *profile; | |
1164 | struct label_it it; | |
1165 | int count = 1; | |
1166 | ||
1167 | label = begin_current_label_crit_section(); | |
1168 | ||
1169 | if (label->size > 1) { | |
1170 | label_for_each(it, label, profile) | |
1171 | if (profile->ns != labels_ns(label)) { | |
1172 | count++; | |
1173 | break; | |
1174 | } | |
1175 | } | |
1176 | ||
1177 | seq_printf(seq, "%s\n", count > 1 ? "yes" : "no"); | |
1178 | end_current_label_crit_section(label); | |
1179 | ||
1180 | return 0; | |
1181 | } | |
1182 | ||
64c86970 | 1183 | static int seq_ns_level_show(struct seq_file *seq, void *v) |
a71ada30 | 1184 | { |
637f688d | 1185 | struct aa_label *label; |
a71ada30 | 1186 | |
637f688d JJ |
1187 | label = begin_current_label_crit_section(); |
1188 | seq_printf(seq, "%d\n", labels_ns(label)->level); | |
1189 | end_current_label_crit_section(label); | |
a71ada30 JJ |
1190 | |
1191 | return 0; | |
1192 | } | |
1193 | ||
64c86970 | 1194 | static int seq_ns_name_show(struct seq_file *seq, void *v) |
3e3e5695 | 1195 | { |
637f688d | 1196 | struct aa_label *label = begin_current_label_crit_section(); |
040d9e2b | 1197 | seq_printf(seq, "%s\n", labels_ns(label)->base.name); |
637f688d | 1198 | end_current_label_crit_section(label); |
3e3e5695 JJ |
1199 | |
1200 | return 0; | |
1201 | } | |
1202 | ||
2218d081 JT |
1203 | static int seq_ns_compress_min_show(struct seq_file *seq, void *v) |
1204 | { | |
70f24a9f | 1205 | seq_printf(seq, "%d\n", AA_MIN_CLEVEL); |
2218d081 JT |
1206 | return 0; |
1207 | } | |
1208 | ||
1209 | static int seq_ns_compress_max_show(struct seq_file *seq, void *v) | |
1210 | { | |
70f24a9f | 1211 | seq_printf(seq, "%d\n", AA_MAX_CLEVEL); |
2218d081 JT |
1212 | return 0; |
1213 | } | |
1214 | ||
40cde7fc JJ |
1215 | SEQ_NS_FOPS(stacked); |
1216 | SEQ_NS_FOPS(nsstacked); | |
64c86970 JJ |
1217 | SEQ_NS_FOPS(level); |
1218 | SEQ_NS_FOPS(name); | |
2218d081 JT |
1219 | SEQ_NS_FOPS(compress_min); |
1220 | SEQ_NS_FOPS(compress_max); | |
3e3e5695 | 1221 | |
5d5182ca JJ |
1222 | |
1223 | /* policy/raw_data/ * file ops */ | |
d61c57fd | 1224 | #ifdef CONFIG_SECURITY_APPARMOR_EXPORT_BINARY |
5d5182ca JJ |
1225 | #define SEQ_RAWDATA_FOPS(NAME) \ |
1226 | static int seq_rawdata_ ##NAME ##_open(struct inode *inode, struct file *file)\ | |
1227 | { \ | |
1228 | return seq_rawdata_open(inode, file, seq_rawdata_ ##NAME ##_show); \ | |
1229 | } \ | |
1230 | \ | |
1231 | static const struct file_operations seq_rawdata_ ##NAME ##_fops = { \ | |
1232 | .owner = THIS_MODULE, \ | |
1233 | .open = seq_rawdata_ ##NAME ##_open, \ | |
1234 | .read = seq_read, \ | |
1235 | .llseek = seq_lseek, \ | |
1236 | .release = seq_rawdata_release, \ | |
1237 | } \ | |
1238 | ||
1239 | static int seq_rawdata_open(struct inode *inode, struct file *file, | |
1240 | int (*show)(struct seq_file *, void *)) | |
5ac8c355 | 1241 | { |
5d5182ca JJ |
1242 | struct aa_loaddata *data = __aa_get_loaddata(inode->i_private); |
1243 | int error; | |
5ac8c355 | 1244 | |
5d5182ca JJ |
1245 | if (!data) |
1246 | /* lost race this ent is being reaped */ | |
1247 | return -ENOENT; | |
1248 | ||
1249 | error = single_open(file, show, data); | |
1250 | if (error) { | |
1251 | AA_BUG(file->private_data && | |
1252 | ((struct seq_file *)file->private_data)->private); | |
1253 | aa_put_loaddata(data); | |
1254 | } | |
1255 | ||
1256 | return error; | |
5ac8c355 JJ |
1257 | } |
1258 | ||
5d5182ca | 1259 | static int seq_rawdata_release(struct inode *inode, struct file *file) |
5ac8c355 | 1260 | { |
5d5182ca | 1261 | struct seq_file *seq = (struct seq_file *) file->private_data; |
5ac8c355 | 1262 | |
5d5182ca JJ |
1263 | if (seq) |
1264 | aa_put_loaddata(seq->private); | |
0ff3d97f | 1265 | |
5d5182ca JJ |
1266 | return single_release(inode, file); |
1267 | } | |
1268 | ||
1269 | static int seq_rawdata_abi_show(struct seq_file *seq, void *v) | |
1270 | { | |
1271 | struct aa_loaddata *data = seq->private; | |
1272 | ||
1273 | seq_printf(seq, "v%d\n", data->abi); | |
5ac8c355 JJ |
1274 | |
1275 | return 0; | |
1276 | } | |
1277 | ||
5d5182ca | 1278 | static int seq_rawdata_revision_show(struct seq_file *seq, void *v) |
5ac8c355 | 1279 | { |
5d5182ca | 1280 | struct aa_loaddata *data = seq->private; |
5ac8c355 | 1281 | |
5d5182ca JJ |
1282 | seq_printf(seq, "%ld\n", data->revision); |
1283 | ||
1284 | return 0; | |
1285 | } | |
5ac8c355 | 1286 | |
5d5182ca | 1287 | static int seq_rawdata_hash_show(struct seq_file *seq, void *v) |
5ac8c355 | 1288 | { |
5d5182ca | 1289 | struct aa_loaddata *data = seq->private; |
5ac8c355 JJ |
1290 | unsigned int i, size = aa_hash_size(); |
1291 | ||
5d5182ca | 1292 | if (data->hash) { |
5ac8c355 | 1293 | for (i = 0; i < size; i++) |
5d5182ca | 1294 | seq_printf(seq, "%.2x", data->hash[i]); |
47dbd1cd | 1295 | seq_putc(seq, '\n'); |
5ac8c355 | 1296 | } |
5ac8c355 JJ |
1297 | |
1298 | return 0; | |
1299 | } | |
1300 | ||
63c16c3a CC |
1301 | static int seq_rawdata_compressed_size_show(struct seq_file *seq, void *v) |
1302 | { | |
1303 | struct aa_loaddata *data = seq->private; | |
1304 | ||
1305 | seq_printf(seq, "%zu\n", data->compressed_size); | |
1306 | ||
1307 | return 0; | |
1308 | } | |
1309 | ||
5d5182ca JJ |
1310 | SEQ_RAWDATA_FOPS(abi); |
1311 | SEQ_RAWDATA_FOPS(revision); | |
1312 | SEQ_RAWDATA_FOPS(hash); | |
63c16c3a CC |
1313 | SEQ_RAWDATA_FOPS(compressed_size); |
1314 | ||
f4d6b94b | 1315 | static int decompress_zstd(char *src, size_t slen, char *dst, size_t dlen) |
63c16c3a | 1316 | { |
f9da5b14 | 1317 | #ifdef CONFIG_SECURITY_APPARMOR_EXPORT_BINARY |
a2f31df0 | 1318 | if (slen < dlen) { |
f4d6b94b JT |
1319 | const size_t wksp_len = zstd_dctx_workspace_bound(); |
1320 | zstd_dctx *ctx; | |
1321 | void *wksp; | |
1322 | size_t out_len; | |
1323 | int ret = 0; | |
1324 | ||
1325 | wksp = kvzalloc(wksp_len, GFP_KERNEL); | |
1326 | if (!wksp) { | |
1327 | ret = -ENOMEM; | |
1328 | goto cleanup; | |
f9da5b14 | 1329 | } |
14d37a7f JJ |
1330 | ctx = zstd_init_dctx(wksp, wksp_len); |
1331 | if (ctx == NULL) { | |
1332 | ret = -ENOMEM; | |
1333 | goto cleanup; | |
1334 | } | |
f4d6b94b JT |
1335 | out_len = zstd_decompress_dctx(ctx, dst, dlen, src, slen); |
1336 | if (zstd_is_error(out_len)) { | |
1337 | ret = -EINVAL; | |
1338 | goto cleanup; | |
1339 | } | |
1340 | cleanup: | |
1341 | kvfree(wksp); | |
1342 | return ret; | |
f9da5b14 JJ |
1343 | } |
1344 | #endif | |
1345 | ||
1346 | if (dlen < slen) | |
1347 | return -EINVAL; | |
1348 | memcpy(dst, src, slen); | |
1349 | return 0; | |
63c16c3a | 1350 | } |
5ac8c355 JJ |
1351 | |
1352 | static ssize_t rawdata_read(struct file *file, char __user *buf, size_t size, | |
1353 | loff_t *ppos) | |
1354 | { | |
63c16c3a | 1355 | struct rawdata_f_data *private = file->private_data; |
5ac8c355 | 1356 | |
63c16c3a CC |
1357 | return simple_read_from_buffer(buf, size, ppos, |
1358 | RAWDATA_F_DATA_BUF(private), | |
1359 | private->loaddata->size); | |
5ac8c355 JJ |
1360 | } |
1361 | ||
5d5182ca | 1362 | static int rawdata_release(struct inode *inode, struct file *file) |
5ac8c355 | 1363 | { |
63c16c3a | 1364 | rawdata_f_data_free(file->private_data); |
5d5182ca JJ |
1365 | |
1366 | return 0; | |
1367 | } | |
5ac8c355 | 1368 | |
5d5182ca JJ |
1369 | static int rawdata_open(struct inode *inode, struct file *file) |
1370 | { | |
63c16c3a CC |
1371 | int error; |
1372 | struct aa_loaddata *loaddata; | |
1373 | struct rawdata_f_data *private; | |
1374 | ||
92de220a | 1375 | if (!aa_current_policy_view_capable(NULL)) |
5ac8c355 | 1376 | return -EACCES; |
63c16c3a CC |
1377 | |
1378 | loaddata = __aa_get_loaddata(inode->i_private); | |
1379 | if (!loaddata) | |
5d5182ca JJ |
1380 | /* lost race: this entry is being reaped */ |
1381 | return -ENOENT; | |
5ac8c355 | 1382 | |
63c16c3a CC |
1383 | private = rawdata_f_data_alloc(loaddata->size); |
1384 | if (IS_ERR(private)) { | |
1385 | error = PTR_ERR(private); | |
1386 | goto fail_private_alloc; | |
1387 | } | |
1388 | ||
1389 | private->loaddata = loaddata; | |
1390 | ||
f4d6b94b JT |
1391 | error = decompress_zstd(loaddata->data, loaddata->compressed_size, |
1392 | RAWDATA_F_DATA_BUF(private), | |
1393 | loaddata->size); | |
63c16c3a CC |
1394 | if (error) |
1395 | goto fail_decompress; | |
1396 | ||
1397 | file->private_data = private; | |
5ac8c355 | 1398 | return 0; |
63c16c3a CC |
1399 | |
1400 | fail_decompress: | |
1401 | rawdata_f_data_free(private); | |
1402 | return error; | |
1403 | ||
1404 | fail_private_alloc: | |
1405 | aa_put_loaddata(loaddata); | |
1406 | return error; | |
5ac8c355 JJ |
1407 | } |
1408 | ||
5d5182ca | 1409 | static const struct file_operations rawdata_fops = { |
5ac8c355 JJ |
1410 | .open = rawdata_open, |
1411 | .read = rawdata_read, | |
1412 | .llseek = generic_file_llseek, | |
1413 | .release = rawdata_release, | |
1414 | }; | |
1415 | ||
5d5182ca JJ |
1416 | static void remove_rawdata_dents(struct aa_loaddata *rawdata) |
1417 | { | |
1418 | int i; | |
1419 | ||
1420 | for (i = 0; i < AAFS_LOADDATA_NDENTS; i++) { | |
1421 | if (!IS_ERR_OR_NULL(rawdata->dents[i])) { | |
1422 | /* no refcounts on i_private */ | |
c961ee5f | 1423 | aafs_remove(rawdata->dents[i]); |
5d5182ca JJ |
1424 | rawdata->dents[i] = NULL; |
1425 | } | |
1426 | } | |
1427 | } | |
1428 | ||
1429 | void __aa_fs_remove_rawdata(struct aa_loaddata *rawdata) | |
1430 | { | |
1431 | AA_BUG(rawdata->ns && !mutex_is_locked(&rawdata->ns->lock)); | |
1432 | ||
1433 | if (rawdata->ns) { | |
1434 | remove_rawdata_dents(rawdata); | |
1435 | list_del_init(&rawdata->list); | |
1436 | aa_put_ns(rawdata->ns); | |
1437 | rawdata->ns = NULL; | |
1438 | } | |
1439 | } | |
1440 | ||
1441 | int __aa_fs_create_rawdata(struct aa_ns *ns, struct aa_loaddata *rawdata) | |
1442 | { | |
1443 | struct dentry *dent, *dir; | |
1444 | ||
1445 | AA_BUG(!ns); | |
1446 | AA_BUG(!rawdata); | |
1447 | AA_BUG(!mutex_is_locked(&ns->lock)); | |
1448 | AA_BUG(!ns_subdata_dir(ns)); | |
1449 | ||
1450 | /* | |
1451 | * just use ns revision dir was originally created at. This is | |
1452 | * under ns->lock and if load is successful revision will be | |
1453 | * bumped and is guaranteed to be unique | |
1454 | */ | |
1455 | rawdata->name = kasprintf(GFP_KERNEL, "%ld", ns->revision); | |
1456 | if (!rawdata->name) | |
1457 | return -ENOMEM; | |
1458 | ||
c961ee5f | 1459 | dir = aafs_create_dir(rawdata->name, ns_subdata_dir(ns)); |
5d5182ca JJ |
1460 | if (IS_ERR(dir)) |
1461 | /* ->name freed when rawdata freed */ | |
1462 | return PTR_ERR(dir); | |
1463 | rawdata->dents[AAFS_LOADDATA_DIR] = dir; | |
1464 | ||
c961ee5f | 1465 | dent = aafs_create_file("abi", S_IFREG | 0444, dir, rawdata, |
5d5182ca JJ |
1466 | &seq_rawdata_abi_fops); |
1467 | if (IS_ERR(dent)) | |
1468 | goto fail; | |
1469 | rawdata->dents[AAFS_LOADDATA_ABI] = dent; | |
1470 | ||
c961ee5f | 1471 | dent = aafs_create_file("revision", S_IFREG | 0444, dir, rawdata, |
5d5182ca JJ |
1472 | &seq_rawdata_revision_fops); |
1473 | if (IS_ERR(dent)) | |
1474 | goto fail; | |
1475 | rawdata->dents[AAFS_LOADDATA_REVISION] = dent; | |
1476 | ||
1477 | if (aa_g_hash_policy) { | |
c961ee5f | 1478 | dent = aafs_create_file("sha1", S_IFREG | 0444, dir, |
5d5182ca JJ |
1479 | rawdata, &seq_rawdata_hash_fops); |
1480 | if (IS_ERR(dent)) | |
1481 | goto fail; | |
1482 | rawdata->dents[AAFS_LOADDATA_HASH] = dent; | |
1483 | } | |
1484 | ||
63c16c3a CC |
1485 | dent = aafs_create_file("compressed_size", S_IFREG | 0444, dir, |
1486 | rawdata, | |
1487 | &seq_rawdata_compressed_size_fops); | |
1488 | if (IS_ERR(dent)) | |
1489 | goto fail; | |
1490 | rawdata->dents[AAFS_LOADDATA_COMPRESSED_SIZE] = dent; | |
1491 | ||
c961ee5f | 1492 | dent = aafs_create_file("raw_data", S_IFREG | 0444, |
5d5182ca JJ |
1493 | dir, rawdata, &rawdata_fops); |
1494 | if (IS_ERR(dent)) | |
1495 | goto fail; | |
1496 | rawdata->dents[AAFS_LOADDATA_DATA] = dent; | |
1497 | d_inode(dent)->i_size = rawdata->size; | |
1498 | ||
1499 | rawdata->ns = aa_get_ns(ns); | |
1500 | list_add(&rawdata->list, &ns->rawdata_list); | |
1501 | /* no refcount on inode rawdata */ | |
1502 | ||
1503 | return 0; | |
1504 | ||
1505 | fail: | |
1506 | remove_rawdata_dents(rawdata); | |
1507 | ||
1508 | return PTR_ERR(dent); | |
1509 | } | |
d61c57fd JJ |
1510 | #endif /* CONFIG_SECURITY_APPARMOR_EXPORT_BINARY */ |
1511 | ||
5d5182ca | 1512 | |
0d259f04 | 1513 | /** fns to setup dynamic per profile/namespace files **/ |
c97204ba | 1514 | |
564423bf | 1515 | /* |
c97204ba JJ |
1516 | * |
1517 | * Requires: @profile->ns->lock held | |
1518 | */ | |
1519 | void __aafs_profile_rmdir(struct aa_profile *profile) | |
0d259f04 JJ |
1520 | { |
1521 | struct aa_profile *child; | |
1522 | int i; | |
1523 | ||
1524 | if (!profile) | |
1525 | return; | |
1526 | ||
1527 | list_for_each_entry(child, &profile->base.profiles, base.list) | |
c97204ba | 1528 | __aafs_profile_rmdir(child); |
0d259f04 JJ |
1529 | |
1530 | for (i = AAFS_PROF_SIZEOF - 1; i >= 0; --i) { | |
8399588a | 1531 | struct aa_proxy *proxy; |
0d259f04 JJ |
1532 | if (!profile->dents[i]) |
1533 | continue; | |
1534 | ||
8399588a | 1535 | proxy = d_inode(profile->dents[i])->i_private; |
c961ee5f | 1536 | aafs_remove(profile->dents[i]); |
8399588a | 1537 | aa_put_proxy(proxy); |
0d259f04 JJ |
1538 | profile->dents[i] = NULL; |
1539 | } | |
1540 | } | |
1541 | ||
564423bf | 1542 | /* |
c97204ba JJ |
1543 | * |
1544 | * Requires: @old->ns->lock held | |
1545 | */ | |
1546 | void __aafs_profile_migrate_dents(struct aa_profile *old, | |
1547 | struct aa_profile *new) | |
0d259f04 JJ |
1548 | { |
1549 | int i; | |
1550 | ||
cbf2d0e1 JJ |
1551 | AA_BUG(!old); |
1552 | AA_BUG(!new); | |
1553 | AA_BUG(!mutex_is_locked(&profiles_ns(old)->lock)); | |
1554 | ||
0d259f04 JJ |
1555 | for (i = 0; i < AAFS_PROF_SIZEOF; i++) { |
1556 | new->dents[i] = old->dents[i]; | |
46fc6b35 JL |
1557 | if (new->dents[i]) { |
1558 | struct inode *inode = d_inode(new->dents[i]); | |
1559 | ||
6ac54226 | 1560 | inode->i_mtime = inode_set_ctime_current(inode); |
46fc6b35 | 1561 | } |
0d259f04 JJ |
1562 | old->dents[i] = NULL; |
1563 | } | |
1564 | } | |
1565 | ||
1566 | static struct dentry *create_profile_file(struct dentry *dir, const char *name, | |
1567 | struct aa_profile *profile, | |
1568 | const struct file_operations *fops) | |
1569 | { | |
637f688d | 1570 | struct aa_proxy *proxy = aa_get_proxy(profile->label.proxy); |
0d259f04 JJ |
1571 | struct dentry *dent; |
1572 | ||
c961ee5f | 1573 | dent = aafs_create_file(name, S_IFREG | 0444, dir, proxy, fops); |
0d259f04 | 1574 | if (IS_ERR(dent)) |
8399588a | 1575 | aa_put_proxy(proxy); |
0d259f04 JJ |
1576 | |
1577 | return dent; | |
1578 | } | |
1579 | ||
d61c57fd | 1580 | #ifdef CONFIG_SECURITY_APPARMOR_EXPORT_BINARY |
5d5182ca JJ |
1581 | static int profile_depth(struct aa_profile *profile) |
1582 | { | |
1583 | int depth = 0; | |
1584 | ||
1585 | rcu_read_lock(); | |
1586 | for (depth = 0; profile; profile = rcu_access_pointer(profile->parent)) | |
1587 | depth++; | |
1588 | rcu_read_unlock(); | |
1589 | ||
1590 | return depth; | |
1591 | } | |
1592 | ||
1180b4c7 | 1593 | static char *gen_symlink_name(int depth, const char *dirname, const char *fname) |
5d5182ca | 1594 | { |
1180b4c7 | 1595 | char *buffer, *s; |
5d5182ca | 1596 | int error; |
1180b4c7 JJ |
1597 | int size = depth * 6 + strlen(dirname) + strlen(fname) + 11; |
1598 | ||
1599 | s = buffer = kmalloc(size, GFP_KERNEL); | |
1600 | if (!buffer) | |
1601 | return ERR_PTR(-ENOMEM); | |
5d5182ca JJ |
1602 | |
1603 | for (; depth > 0; depth--) { | |
1180b4c7 JJ |
1604 | strcpy(s, "../../"); |
1605 | s += 6; | |
1606 | size -= 6; | |
5d5182ca JJ |
1607 | } |
1608 | ||
1180b4c7 | 1609 | error = snprintf(s, size, "raw_data/%s/%s", dirname, fname); |
588558eb CIK |
1610 | if (error >= size || error < 0) { |
1611 | kfree(buffer); | |
1180b4c7 | 1612 | return ERR_PTR(-ENAMETOOLONG); |
588558eb | 1613 | } |
5d5182ca | 1614 | |
1180b4c7 JJ |
1615 | return buffer; |
1616 | } | |
1617 | ||
1618 | static void rawdata_link_cb(void *arg) | |
1619 | { | |
1620 | kfree(arg); | |
1621 | } | |
1622 | ||
1623 | static const char *rawdata_get_link_base(struct dentry *dentry, | |
1624 | struct inode *inode, | |
1625 | struct delayed_call *done, | |
1626 | const char *name) | |
1627 | { | |
1628 | struct aa_proxy *proxy = inode->i_private; | |
1629 | struct aa_label *label; | |
1630 | struct aa_profile *profile; | |
1631 | char *target; | |
1632 | int depth; | |
1633 | ||
1634 | if (!dentry) | |
1635 | return ERR_PTR(-ECHILD); | |
1636 | ||
1637 | label = aa_get_label_rcu(&proxy->label); | |
1638 | profile = labels_profile(label); | |
1639 | depth = profile_depth(profile); | |
1640 | target = gen_symlink_name(depth, profile->rawdata->name, name); | |
1641 | aa_put_label(label); | |
1642 | ||
1643 | if (IS_ERR(target)) | |
1644 | return target; | |
1645 | ||
1646 | set_delayed_call(done, rawdata_link_cb, target); | |
1647 | ||
1648 | return target; | |
1649 | } | |
1650 | ||
1651 | static const char *rawdata_get_link_sha1(struct dentry *dentry, | |
1652 | struct inode *inode, | |
1653 | struct delayed_call *done) | |
1654 | { | |
1655 | return rawdata_get_link_base(dentry, inode, done, "sha1"); | |
1656 | } | |
1657 | ||
1658 | static const char *rawdata_get_link_abi(struct dentry *dentry, | |
1659 | struct inode *inode, | |
1660 | struct delayed_call *done) | |
1661 | { | |
1662 | return rawdata_get_link_base(dentry, inode, done, "abi"); | |
5d5182ca JJ |
1663 | } |
1664 | ||
1180b4c7 JJ |
1665 | static const char *rawdata_get_link_data(struct dentry *dentry, |
1666 | struct inode *inode, | |
1667 | struct delayed_call *done) | |
1668 | { | |
1669 | return rawdata_get_link_base(dentry, inode, done, "raw_data"); | |
5d5182ca JJ |
1670 | } |
1671 | ||
1180b4c7 JJ |
1672 | static const struct inode_operations rawdata_link_sha1_iops = { |
1673 | .get_link = rawdata_get_link_sha1, | |
1674 | }; | |
1675 | ||
1676 | static const struct inode_operations rawdata_link_abi_iops = { | |
1677 | .get_link = rawdata_get_link_abi, | |
1678 | }; | |
1679 | static const struct inode_operations rawdata_link_data_iops = { | |
1680 | .get_link = rawdata_get_link_data, | |
1681 | }; | |
d61c57fd | 1682 | #endif /* CONFIG_SECURITY_APPARMOR_EXPORT_BINARY */ |
1180b4c7 | 1683 | |
5d5182ca JJ |
1684 | /* |
1685 | * Requires: @profile->ns->lock held | |
1686 | */ | |
c97204ba | 1687 | int __aafs_profile_mkdir(struct aa_profile *profile, struct dentry *parent) |
0d259f04 JJ |
1688 | { |
1689 | struct aa_profile *child; | |
1690 | struct dentry *dent = NULL, *dir; | |
1691 | int error; | |
1692 | ||
cbf2d0e1 JJ |
1693 | AA_BUG(!profile); |
1694 | AA_BUG(!mutex_is_locked(&profiles_ns(profile)->lock)); | |
1695 | ||
0d259f04 JJ |
1696 | if (!parent) { |
1697 | struct aa_profile *p; | |
1698 | p = aa_deref_parent(profile); | |
1699 | dent = prof_dir(p); | |
1700 | /* adding to parent that previously didn't have children */ | |
c961ee5f | 1701 | dent = aafs_create_dir("profiles", dent); |
0d259f04 JJ |
1702 | if (IS_ERR(dent)) |
1703 | goto fail; | |
1704 | prof_child_dir(p) = parent = dent; | |
1705 | } | |
1706 | ||
1707 | if (!profile->dirname) { | |
1708 | int len, id_len; | |
1709 | len = mangle_name(profile->base.name, NULL); | |
1710 | id_len = snprintf(NULL, 0, ".%ld", profile->ns->uniq_id); | |
1711 | ||
1712 | profile->dirname = kmalloc(len + id_len + 1, GFP_KERNEL); | |
ffac1de6 DC |
1713 | if (!profile->dirname) { |
1714 | error = -ENOMEM; | |
1715 | goto fail2; | |
1716 | } | |
0d259f04 JJ |
1717 | |
1718 | mangle_name(profile->base.name, profile->dirname); | |
1719 | sprintf(profile->dirname + len, ".%ld", profile->ns->uniq_id++); | |
1720 | } | |
1721 | ||
c961ee5f | 1722 | dent = aafs_create_dir(profile->dirname, parent); |
0d259f04 JJ |
1723 | if (IS_ERR(dent)) |
1724 | goto fail; | |
1725 | prof_dir(profile) = dir = dent; | |
1726 | ||
52b97de3 JJ |
1727 | dent = create_profile_file(dir, "name", profile, |
1728 | &seq_profile_name_fops); | |
0d259f04 JJ |
1729 | if (IS_ERR(dent)) |
1730 | goto fail; | |
1731 | profile->dents[AAFS_PROF_NAME] = dent; | |
1732 | ||
52b97de3 JJ |
1733 | dent = create_profile_file(dir, "mode", profile, |
1734 | &seq_profile_mode_fops); | |
0d259f04 JJ |
1735 | if (IS_ERR(dent)) |
1736 | goto fail; | |
1737 | profile->dents[AAFS_PROF_MODE] = dent; | |
1738 | ||
556d0be7 | 1739 | dent = create_profile_file(dir, "attach", profile, |
52b97de3 | 1740 | &seq_profile_attach_fops); |
556d0be7 JJ |
1741 | if (IS_ERR(dent)) |
1742 | goto fail; | |
1743 | profile->dents[AAFS_PROF_ATTACH] = dent; | |
1744 | ||
f8eb8a13 JJ |
1745 | if (profile->hash) { |
1746 | dent = create_profile_file(dir, "sha1", profile, | |
52b97de3 | 1747 | &seq_profile_hash_fops); |
f8eb8a13 JJ |
1748 | if (IS_ERR(dent)) |
1749 | goto fail; | |
1750 | profile->dents[AAFS_PROF_HASH] = dent; | |
1751 | } | |
1752 | ||
d61c57fd | 1753 | #ifdef CONFIG_SECURITY_APPARMOR_EXPORT_BINARY |
5ac8c355 | 1754 | if (profile->rawdata) { |
482e8050 JJ |
1755 | if (aa_g_hash_policy) { |
1756 | dent = aafs_create("raw_sha1", S_IFLNK | 0444, dir, | |
1757 | profile->label.proxy, NULL, NULL, | |
1758 | &rawdata_link_sha1_iops); | |
1759 | if (IS_ERR(dent)) | |
1760 | goto fail; | |
1761 | aa_get_proxy(profile->label.proxy); | |
1762 | profile->dents[AAFS_PROF_RAW_HASH] = dent; | |
1763 | } | |
a68d59ff JJ |
1764 | dent = aafs_create("raw_abi", S_IFLNK | 0444, dir, |
1765 | profile->label.proxy, NULL, NULL, | |
1766 | &rawdata_link_abi_iops); | |
5ac8c355 JJ |
1767 | if (IS_ERR(dent)) |
1768 | goto fail; | |
1180b4c7 | 1769 | aa_get_proxy(profile->label.proxy); |
5ac8c355 JJ |
1770 | profile->dents[AAFS_PROF_RAW_ABI] = dent; |
1771 | ||
a68d59ff JJ |
1772 | dent = aafs_create("raw_data", S_IFLNK | 0444, dir, |
1773 | profile->label.proxy, NULL, NULL, | |
1774 | &rawdata_link_data_iops); | |
5ac8c355 JJ |
1775 | if (IS_ERR(dent)) |
1776 | goto fail; | |
1180b4c7 | 1777 | aa_get_proxy(profile->label.proxy); |
5ac8c355 | 1778 | profile->dents[AAFS_PROF_RAW_DATA] = dent; |
5ac8c355 | 1779 | } |
d61c57fd | 1780 | #endif /*CONFIG_SECURITY_APPARMOR_EXPORT_BINARY */ |
5ac8c355 | 1781 | |
0d259f04 | 1782 | list_for_each_entry(child, &profile->base.profiles, base.list) { |
c97204ba | 1783 | error = __aafs_profile_mkdir(child, prof_child_dir(profile)); |
0d259f04 JJ |
1784 | if (error) |
1785 | goto fail2; | |
1786 | } | |
1787 | ||
1788 | return 0; | |
1789 | ||
1790 | fail: | |
1791 | error = PTR_ERR(dent); | |
1792 | ||
1793 | fail2: | |
c97204ba | 1794 | __aafs_profile_rmdir(profile); |
0d259f04 JJ |
1795 | |
1796 | return error; | |
1797 | } | |
1798 | ||
c54bd91e | 1799 | static int ns_mkdir_op(struct mnt_idmap *idmap, struct inode *dir, |
549c7297 | 1800 | struct dentry *dentry, umode_t mode) |
4ae47f33 JJ |
1801 | { |
1802 | struct aa_ns *ns, *parent; | |
1803 | /* TODO: improve permission check */ | |
637f688d JJ |
1804 | struct aa_label *label; |
1805 | int error; | |
1806 | ||
1807 | label = begin_current_label_crit_section(); | |
1808 | error = aa_may_manage_policy(label, NULL, AA_MAY_LOAD_POLICY); | |
1809 | end_current_label_crit_section(label); | |
4ae47f33 JJ |
1810 | if (error) |
1811 | return error; | |
1812 | ||
1813 | parent = aa_get_ns(dir->i_private); | |
1814 | AA_BUG(d_inode(ns_subns_dir(parent)) != dir); | |
1815 | ||
1816 | /* we have to unlock and then relock to get locking order right | |
1817 | * for pin_fs | |
1818 | */ | |
1819 | inode_unlock(dir); | |
1820 | error = simple_pin_fs(&aafs_ops, &aafs_mnt, &aafs_count); | |
feb3c766 | 1821 | mutex_lock_nested(&parent->lock, parent->level); |
4ae47f33 JJ |
1822 | inode_lock_nested(dir, I_MUTEX_PARENT); |
1823 | if (error) | |
1824 | goto out; | |
1825 | ||
1826 | error = __aafs_setup_d_inode(dir, dentry, mode | S_IFDIR, NULL, | |
1827 | NULL, NULL, NULL); | |
1828 | if (error) | |
1829 | goto out_pin; | |
1830 | ||
1831 | ns = __aa_find_or_create_ns(parent, READ_ONCE(dentry->d_name.name), | |
1832 | dentry); | |
1833 | if (IS_ERR(ns)) { | |
1834 | error = PTR_ERR(ns); | |
1835 | ns = NULL; | |
1836 | } | |
1837 | ||
1838 | aa_put_ns(ns); /* list ref remains */ | |
1839 | out_pin: | |
1840 | if (error) | |
1841 | simple_release_fs(&aafs_mnt, &aafs_count); | |
1842 | out: | |
1843 | mutex_unlock(&parent->lock); | |
1844 | aa_put_ns(parent); | |
1845 | ||
1846 | return error; | |
1847 | } | |
1848 | ||
1849 | static int ns_rmdir_op(struct inode *dir, struct dentry *dentry) | |
1850 | { | |
1851 | struct aa_ns *ns, *parent; | |
1852 | /* TODO: improve permission check */ | |
637f688d JJ |
1853 | struct aa_label *label; |
1854 | int error; | |
1855 | ||
1856 | label = begin_current_label_crit_section(); | |
1857 | error = aa_may_manage_policy(label, NULL, AA_MAY_LOAD_POLICY); | |
1858 | end_current_label_crit_section(label); | |
4ae47f33 JJ |
1859 | if (error) |
1860 | return error; | |
1861 | ||
566f52ec | 1862 | parent = aa_get_ns(dir->i_private); |
4ae47f33 JJ |
1863 | /* rmdir calls the generic securityfs functions to remove files |
1864 | * from the apparmor dir. It is up to the apparmor ns locking | |
1865 | * to avoid races. | |
1866 | */ | |
1867 | inode_unlock(dir); | |
1868 | inode_unlock(dentry->d_inode); | |
1869 | ||
feb3c766 | 1870 | mutex_lock_nested(&parent->lock, parent->level); |
4ae47f33 JJ |
1871 | ns = aa_get_ns(__aa_findn_ns(&parent->sub_ns, dentry->d_name.name, |
1872 | dentry->d_name.len)); | |
1873 | if (!ns) { | |
1874 | error = -ENOENT; | |
1875 | goto out; | |
1876 | } | |
1877 | AA_BUG(ns_dir(ns) != dentry); | |
1878 | ||
1879 | __aa_remove_ns(ns); | |
1880 | aa_put_ns(ns); | |
1881 | ||
1882 | out: | |
1883 | mutex_unlock(&parent->lock); | |
1884 | inode_lock_nested(dir, I_MUTEX_PARENT); | |
1885 | inode_lock(dentry->d_inode); | |
1886 | aa_put_ns(parent); | |
1887 | ||
1888 | return error; | |
1889 | } | |
1890 | ||
1891 | static const struct inode_operations ns_dir_inode_operations = { | |
1892 | .lookup = simple_lookup, | |
1893 | .mkdir = ns_mkdir_op, | |
1894 | .rmdir = ns_rmdir_op, | |
1895 | }; | |
1896 | ||
5d5182ca JJ |
1897 | static void __aa_fs_list_remove_rawdata(struct aa_ns *ns) |
1898 | { | |
1899 | struct aa_loaddata *ent, *tmp; | |
1900 | ||
1901 | AA_BUG(!mutex_is_locked(&ns->lock)); | |
1902 | ||
1903 | list_for_each_entry_safe(ent, tmp, &ns->rawdata_list, list) | |
1904 | __aa_fs_remove_rawdata(ent); | |
1905 | } | |
1906 | ||
564423bf | 1907 | /* |
c97204ba JJ |
1908 | * |
1909 | * Requires: @ns->lock held | |
1910 | */ | |
1911 | void __aafs_ns_rmdir(struct aa_ns *ns) | |
0d259f04 | 1912 | { |
98849dff | 1913 | struct aa_ns *sub; |
0d259f04 JJ |
1914 | struct aa_profile *child; |
1915 | int i; | |
1916 | ||
1917 | if (!ns) | |
1918 | return; | |
cbf2d0e1 | 1919 | AA_BUG(!mutex_is_locked(&ns->lock)); |
0d259f04 JJ |
1920 | |
1921 | list_for_each_entry(child, &ns->base.profiles, base.list) | |
c97204ba | 1922 | __aafs_profile_rmdir(child); |
0d259f04 JJ |
1923 | |
1924 | list_for_each_entry(sub, &ns->sub_ns, base.list) { | |
feb3c766 | 1925 | mutex_lock_nested(&sub->lock, sub->level); |
c97204ba | 1926 | __aafs_ns_rmdir(sub); |
0d259f04 JJ |
1927 | mutex_unlock(&sub->lock); |
1928 | } | |
1929 | ||
5d5182ca JJ |
1930 | __aa_fs_list_remove_rawdata(ns); |
1931 | ||
b7fd2c03 JJ |
1932 | if (ns_subns_dir(ns)) { |
1933 | sub = d_inode(ns_subns_dir(ns))->i_private; | |
1934 | aa_put_ns(sub); | |
1935 | } | |
1936 | if (ns_subload(ns)) { | |
1937 | sub = d_inode(ns_subload(ns))->i_private; | |
1938 | aa_put_ns(sub); | |
1939 | } | |
1940 | if (ns_subreplace(ns)) { | |
1941 | sub = d_inode(ns_subreplace(ns))->i_private; | |
1942 | aa_put_ns(sub); | |
1943 | } | |
1944 | if (ns_subremove(ns)) { | |
1945 | sub = d_inode(ns_subremove(ns))->i_private; | |
1946 | aa_put_ns(sub); | |
1947 | } | |
d9bf2c26 JJ |
1948 | if (ns_subrevision(ns)) { |
1949 | sub = d_inode(ns_subrevision(ns))->i_private; | |
1950 | aa_put_ns(sub); | |
1951 | } | |
b7fd2c03 | 1952 | |
0d259f04 | 1953 | for (i = AAFS_NS_SIZEOF - 1; i >= 0; --i) { |
c961ee5f | 1954 | aafs_remove(ns->dents[i]); |
0d259f04 JJ |
1955 | ns->dents[i] = NULL; |
1956 | } | |
1957 | } | |
1958 | ||
b7fd2c03 | 1959 | /* assumes cleanup in caller */ |
c97204ba | 1960 | static int __aafs_ns_mkdir_entries(struct aa_ns *ns, struct dentry *dir) |
b7fd2c03 JJ |
1961 | { |
1962 | struct dentry *dent; | |
1963 | ||
1964 | AA_BUG(!ns); | |
1965 | AA_BUG(!dir); | |
1966 | ||
c961ee5f | 1967 | dent = aafs_create_dir("profiles", dir); |
b7fd2c03 JJ |
1968 | if (IS_ERR(dent)) |
1969 | return PTR_ERR(dent); | |
1970 | ns_subprofs_dir(ns) = dent; | |
1971 | ||
c961ee5f | 1972 | dent = aafs_create_dir("raw_data", dir); |
b7fd2c03 JJ |
1973 | if (IS_ERR(dent)) |
1974 | return PTR_ERR(dent); | |
1975 | ns_subdata_dir(ns) = dent; | |
1976 | ||
d9bf2c26 JJ |
1977 | dent = aafs_create_file("revision", 0444, dir, ns, |
1978 | &aa_fs_ns_revision_fops); | |
1979 | if (IS_ERR(dent)) | |
1980 | return PTR_ERR(dent); | |
1981 | aa_get_ns(ns); | |
1982 | ns_subrevision(ns) = dent; | |
1983 | ||
c961ee5f | 1984 | dent = aafs_create_file(".load", 0640, dir, ns, |
b7fd2c03 JJ |
1985 | &aa_fs_profile_load); |
1986 | if (IS_ERR(dent)) | |
1987 | return PTR_ERR(dent); | |
1988 | aa_get_ns(ns); | |
1989 | ns_subload(ns) = dent; | |
1990 | ||
c961ee5f | 1991 | dent = aafs_create_file(".replace", 0640, dir, ns, |
b7fd2c03 JJ |
1992 | &aa_fs_profile_replace); |
1993 | if (IS_ERR(dent)) | |
1994 | return PTR_ERR(dent); | |
1995 | aa_get_ns(ns); | |
1996 | ns_subreplace(ns) = dent; | |
1997 | ||
c961ee5f | 1998 | dent = aafs_create_file(".remove", 0640, dir, ns, |
b7fd2c03 JJ |
1999 | &aa_fs_profile_remove); |
2000 | if (IS_ERR(dent)) | |
2001 | return PTR_ERR(dent); | |
2002 | aa_get_ns(ns); | |
2003 | ns_subremove(ns) = dent; | |
2004 | ||
4ae47f33 JJ |
2005 | /* use create_dentry so we can supply private data */ |
2006 | dent = aafs_create("namespaces", S_IFDIR | 0755, dir, ns, NULL, NULL, | |
2007 | &ns_dir_inode_operations); | |
b7fd2c03 JJ |
2008 | if (IS_ERR(dent)) |
2009 | return PTR_ERR(dent); | |
2010 | aa_get_ns(ns); | |
2011 | ns_subns_dir(ns) = dent; | |
2012 | ||
2013 | return 0; | |
2014 | } | |
2015 | ||
c97204ba JJ |
2016 | /* |
2017 | * Requires: @ns->lock held | |
2018 | */ | |
98407f0a JJ |
2019 | int __aafs_ns_mkdir(struct aa_ns *ns, struct dentry *parent, const char *name, |
2020 | struct dentry *dent) | |
0d259f04 | 2021 | { |
98849dff | 2022 | struct aa_ns *sub; |
0d259f04 | 2023 | struct aa_profile *child; |
98407f0a | 2024 | struct dentry *dir; |
0d259f04 JJ |
2025 | int error; |
2026 | ||
b7fd2c03 JJ |
2027 | AA_BUG(!ns); |
2028 | AA_BUG(!parent); | |
2029 | AA_BUG(!mutex_is_locked(&ns->lock)); | |
2030 | ||
0d259f04 JJ |
2031 | if (!name) |
2032 | name = ns->base.name; | |
2033 | ||
c961ee5f JJ |
2034 | if (!dent) { |
2035 | /* create ns dir if it doesn't already exist */ | |
2036 | dent = aafs_create_dir(name, parent); | |
2037 | if (IS_ERR(dent)) | |
2038 | goto fail; | |
2039 | } else | |
2040 | dget(dent); | |
b7fd2c03 | 2041 | ns_dir(ns) = dir = dent; |
c97204ba | 2042 | error = __aafs_ns_mkdir_entries(ns, dir); |
b7fd2c03 JJ |
2043 | if (error) |
2044 | goto fail2; | |
0d259f04 | 2045 | |
b7fd2c03 | 2046 | /* profiles */ |
0d259f04 | 2047 | list_for_each_entry(child, &ns->base.profiles, base.list) { |
c97204ba | 2048 | error = __aafs_profile_mkdir(child, ns_subprofs_dir(ns)); |
0d259f04 JJ |
2049 | if (error) |
2050 | goto fail2; | |
2051 | } | |
2052 | ||
b7fd2c03 | 2053 | /* subnamespaces */ |
0d259f04 | 2054 | list_for_each_entry(sub, &ns->sub_ns, base.list) { |
feb3c766 | 2055 | mutex_lock_nested(&sub->lock, sub->level); |
98407f0a | 2056 | error = __aafs_ns_mkdir(sub, ns_subns_dir(ns), NULL, NULL); |
0d259f04 JJ |
2057 | mutex_unlock(&sub->lock); |
2058 | if (error) | |
2059 | goto fail2; | |
2060 | } | |
2061 | ||
2062 | return 0; | |
2063 | ||
2064 | fail: | |
2065 | error = PTR_ERR(dent); | |
2066 | ||
2067 | fail2: | |
c97204ba | 2068 | __aafs_ns_rmdir(ns); |
0d259f04 JJ |
2069 | |
2070 | return error; | |
2071 | } | |
2072 | ||
29b3822f | 2073 | /** |
98849dff | 2074 | * __next_ns - find the next namespace to list |
29b3822f JJ |
2075 | * @root: root namespace to stop search at (NOT NULL) |
2076 | * @ns: current ns position (NOT NULL) | |
2077 | * | |
2078 | * Find the next namespace from @ns under @root and handle all locking needed | |
2079 | * while switching current namespace. | |
2080 | * | |
2081 | * Returns: next namespace or NULL if at last namespace under @root | |
2082 | * Requires: ns->parent->lock to be held | |
2083 | * NOTE: will not unlock root->lock | |
2084 | */ | |
98849dff | 2085 | static struct aa_ns *__next_ns(struct aa_ns *root, struct aa_ns *ns) |
29b3822f | 2086 | { |
98849dff | 2087 | struct aa_ns *parent, *next; |
29b3822f | 2088 | |
cbf2d0e1 JJ |
2089 | AA_BUG(!root); |
2090 | AA_BUG(!ns); | |
2091 | AA_BUG(ns != root && !mutex_is_locked(&ns->parent->lock)); | |
2092 | ||
29b3822f JJ |
2093 | /* is next namespace a child */ |
2094 | if (!list_empty(&ns->sub_ns)) { | |
2095 | next = list_first_entry(&ns->sub_ns, typeof(*ns), base.list); | |
feb3c766 | 2096 | mutex_lock_nested(&next->lock, next->level); |
29b3822f JJ |
2097 | return next; |
2098 | } | |
2099 | ||
2100 | /* check if the next ns is a sibling, parent, gp, .. */ | |
2101 | parent = ns->parent; | |
ed2c7da3 | 2102 | while (ns != root) { |
29b3822f | 2103 | mutex_unlock(&ns->lock); |
38dbd7d8 | 2104 | next = list_next_entry(ns, base.list); |
29b3822f | 2105 | if (!list_entry_is_head(next, &parent->sub_ns, base.list)) { |
feb3c766 | 2106 | mutex_lock_nested(&next->lock, next->level); |
29b3822f JJ |
2107 | return next; |
2108 | } | |
29b3822f JJ |
2109 | ns = parent; |
2110 | parent = parent->parent; | |
2111 | } | |
2112 | ||
2113 | return NULL; | |
2114 | } | |
2115 | ||
2116 | /** | |
2117 | * __first_profile - find the first profile in a namespace | |
2118 | * @root: namespace that is root of profiles being displayed (NOT NULL) | |
2119 | * @ns: namespace to start in (NOT NULL) | |
2120 | * | |
2121 | * Returns: unrefcounted profile or NULL if no profile | |
2122 | * Requires: profile->ns.lock to be held | |
2123 | */ | |
98849dff JJ |
2124 | static struct aa_profile *__first_profile(struct aa_ns *root, |
2125 | struct aa_ns *ns) | |
29b3822f | 2126 | { |
cbf2d0e1 JJ |
2127 | AA_BUG(!root); |
2128 | AA_BUG(ns && !mutex_is_locked(&ns->lock)); | |
2129 | ||
98849dff | 2130 | for (; ns; ns = __next_ns(root, ns)) { |
29b3822f JJ |
2131 | if (!list_empty(&ns->base.profiles)) |
2132 | return list_first_entry(&ns->base.profiles, | |
2133 | struct aa_profile, base.list); | |
2134 | } | |
2135 | return NULL; | |
2136 | } | |
2137 | ||
2138 | /** | |
2139 | * __next_profile - step to the next profile in a profile tree | |
aa4ceed7 | 2140 | * @p: current profile in tree (NOT NULL) |
29b3822f JJ |
2141 | * |
2142 | * Perform a depth first traversal on the profile tree in a namespace | |
2143 | * | |
2144 | * Returns: next profile or NULL if done | |
2145 | * Requires: profile->ns.lock to be held | |
2146 | */ | |
2147 | static struct aa_profile *__next_profile(struct aa_profile *p) | |
2148 | { | |
2149 | struct aa_profile *parent; | |
98849dff | 2150 | struct aa_ns *ns = p->ns; |
29b3822f | 2151 | |
cbf2d0e1 JJ |
2152 | AA_BUG(!mutex_is_locked(&profiles_ns(p)->lock)); |
2153 | ||
29b3822f JJ |
2154 | /* is next profile a child */ |
2155 | if (!list_empty(&p->base.profiles)) | |
2156 | return list_first_entry(&p->base.profiles, typeof(*p), | |
2157 | base.list); | |
2158 | ||
2159 | /* is next profile a sibling, parent sibling, gp, sibling, .. */ | |
2160 | parent = rcu_dereference_protected(p->parent, | |
2161 | mutex_is_locked(&p->ns->lock)); | |
2162 | while (parent) { | |
38dbd7d8 | 2163 | p = list_next_entry(p, base.list); |
29b3822f JJ |
2164 | if (!list_entry_is_head(p, &parent->base.profiles, base.list)) |
2165 | return p; | |
2166 | p = parent; | |
2167 | parent = rcu_dereference_protected(parent->parent, | |
2168 | mutex_is_locked(&parent->ns->lock)); | |
2169 | } | |
2170 | ||
2171 | /* is next another profile in the namespace */ | |
38dbd7d8 | 2172 | p = list_next_entry(p, base.list); |
29b3822f JJ |
2173 | if (!list_entry_is_head(p, &ns->base.profiles, base.list)) |
2174 | return p; | |
2175 | ||
2176 | return NULL; | |
2177 | } | |
2178 | ||
2179 | /** | |
2180 | * next_profile - step to the next profile in where ever it may be | |
2181 | * @root: root namespace (NOT NULL) | |
2182 | * @profile: current profile (NOT NULL) | |
2183 | * | |
2184 | * Returns: next profile or NULL if there isn't one | |
2185 | */ | |
98849dff | 2186 | static struct aa_profile *next_profile(struct aa_ns *root, |
29b3822f JJ |
2187 | struct aa_profile *profile) |
2188 | { | |
2189 | struct aa_profile *next = __next_profile(profile); | |
2190 | if (next) | |
2191 | return next; | |
2192 | ||
2193 | /* finished all profiles in namespace move to next namespace */ | |
98849dff | 2194 | return __first_profile(root, __next_ns(root, profile->ns)); |
29b3822f JJ |
2195 | } |
2196 | ||
2197 | /** | |
2198 | * p_start - start a depth first traversal of profile tree | |
2199 | * @f: seq_file to fill | |
2200 | * @pos: current position | |
2201 | * | |
2202 | * Returns: first profile under current namespace or NULL if none found | |
2203 | * | |
2204 | * acquires first ns->lock | |
2205 | */ | |
2206 | static void *p_start(struct seq_file *f, loff_t *pos) | |
2207 | { | |
2208 | struct aa_profile *profile = NULL; | |
cf797c0e | 2209 | struct aa_ns *root = aa_get_current_ns(); |
29b3822f | 2210 | loff_t l = *pos; |
cf797c0e | 2211 | f->private = root; |
29b3822f JJ |
2212 | |
2213 | /* find the first profile */ | |
feb3c766 | 2214 | mutex_lock_nested(&root->lock, root->level); |
29b3822f JJ |
2215 | profile = __first_profile(root, root); |
2216 | ||
2217 | /* skip to position */ | |
2218 | for (; profile && l > 0; l--) | |
2219 | profile = next_profile(root, profile); | |
2220 | ||
2221 | return profile; | |
2222 | } | |
2223 | ||
2224 | /** | |
2225 | * p_next - read the next profile entry | |
2226 | * @f: seq_file to fill | |
2227 | * @p: profile previously returned | |
2228 | * @pos: current position | |
2229 | * | |
2230 | * Returns: next profile after @p or NULL if none | |
2231 | * | |
2232 | * may acquire/release locks in namespace tree as necessary | |
2233 | */ | |
2234 | static void *p_next(struct seq_file *f, void *p, loff_t *pos) | |
2235 | { | |
2236 | struct aa_profile *profile = p; | |
98849dff | 2237 | struct aa_ns *ns = f->private; |
29b3822f JJ |
2238 | (*pos)++; |
2239 | ||
2240 | return next_profile(ns, profile); | |
2241 | } | |
2242 | ||
2243 | /** | |
2244 | * p_stop - stop depth first traversal | |
2245 | * @f: seq_file we are filling | |
2246 | * @p: the last profile writen | |
2247 | * | |
2248 | * Release all locking done by p_start/p_next on namespace tree | |
2249 | */ | |
2250 | static void p_stop(struct seq_file *f, void *p) | |
2251 | { | |
2252 | struct aa_profile *profile = p; | |
98849dff | 2253 | struct aa_ns *root = f->private, *ns; |
29b3822f JJ |
2254 | |
2255 | if (profile) { | |
2256 | for (ns = profile->ns; ns && ns != root; ns = ns->parent) | |
2257 | mutex_unlock(&ns->lock); | |
2258 | } | |
2259 | mutex_unlock(&root->lock); | |
98849dff | 2260 | aa_put_ns(root); |
29b3822f JJ |
2261 | } |
2262 | ||
2263 | /** | |
2264 | * seq_show_profile - show a profile entry | |
2265 | * @f: seq_file to file | |
2266 | * @p: current position (profile) (NOT NULL) | |
2267 | * | |
2268 | * Returns: error on failure | |
2269 | */ | |
2270 | static int seq_show_profile(struct seq_file *f, void *p) | |
2271 | { | |
2272 | struct aa_profile *profile = (struct aa_profile *)p; | |
98849dff | 2273 | struct aa_ns *root = f->private; |
29b3822f | 2274 | |
637f688d JJ |
2275 | aa_label_seq_xprint(f, root, &profile->label, |
2276 | FLAG_SHOW_MODE | FLAG_VIEW_SUBNS, GFP_KERNEL); | |
2277 | seq_putc(f, '\n'); | |
29b3822f JJ |
2278 | |
2279 | return 0; | |
2280 | } | |
2281 | ||
c97204ba | 2282 | static const struct seq_operations aa_sfs_profiles_op = { |
29b3822f JJ |
2283 | .start = p_start, |
2284 | .next = p_next, | |
2285 | .stop = p_stop, | |
2286 | .show = seq_show_profile, | |
2287 | }; | |
2288 | ||
2289 | static int profiles_open(struct inode *inode, struct file *file) | |
2290 | { | |
92de220a | 2291 | if (!aa_current_policy_view_capable(NULL)) |
5ac8c355 JJ |
2292 | return -EACCES; |
2293 | ||
c97204ba | 2294 | return seq_open(file, &aa_sfs_profiles_op); |
29b3822f JJ |
2295 | } |
2296 | ||
2297 | static int profiles_release(struct inode *inode, struct file *file) | |
2298 | { | |
2299 | return seq_release(inode, file); | |
2300 | } | |
2301 | ||
c97204ba | 2302 | static const struct file_operations aa_sfs_profiles_fops = { |
29b3822f JJ |
2303 | .open = profiles_open, |
2304 | .read = seq_read, | |
2305 | .llseek = seq_lseek, | |
2306 | .release = profiles_release, | |
2307 | }; | |
2308 | ||
2309 | ||
0d259f04 | 2310 | /** Base file system setup **/ |
c97204ba JJ |
2311 | static struct aa_sfs_entry aa_sfs_entry_file[] = { |
2312 | AA_SFS_FILE_STRING("mask", | |
2313 | "create read write exec append mmap_exec link lock"), | |
a9bf8e9f KC |
2314 | { } |
2315 | }; | |
2316 | ||
290f458a JJ |
2317 | static struct aa_sfs_entry aa_sfs_entry_ptrace[] = { |
2318 | AA_SFS_FILE_STRING("mask", "read trace"), | |
2319 | { } | |
2320 | }; | |
2321 | ||
cd1dbf76 JJ |
2322 | static struct aa_sfs_entry aa_sfs_entry_signal[] = { |
2323 | AA_SFS_FILE_STRING("mask", AA_SFS_SIG_MASK), | |
2324 | { } | |
2325 | }; | |
2326 | ||
73f488cd JJ |
2327 | static struct aa_sfs_entry aa_sfs_entry_attach[] = { |
2328 | AA_SFS_FILE_BOOLEAN("xattr", 1), | |
2329 | { } | |
2330 | }; | |
c97204ba JJ |
2331 | static struct aa_sfs_entry aa_sfs_entry_domain[] = { |
2332 | AA_SFS_FILE_BOOLEAN("change_hat", 1), | |
2333 | AA_SFS_FILE_BOOLEAN("change_hatv", 1), | |
2334 | AA_SFS_FILE_BOOLEAN("change_onexec", 1), | |
2335 | AA_SFS_FILE_BOOLEAN("change_profile", 1), | |
6c5fc8f1 | 2336 | AA_SFS_FILE_BOOLEAN("stack", 1), |
c97204ba | 2337 | AA_SFS_FILE_BOOLEAN("fix_binfmt_elf_mmap", 1), |
9fcf78cc | 2338 | AA_SFS_FILE_BOOLEAN("post_nnp_subset", 1), |
21f60661 | 2339 | AA_SFS_FILE_BOOLEAN("computed_longest_left", 1), |
73f488cd | 2340 | AA_SFS_DIR("attach_conditions", aa_sfs_entry_attach), |
c97204ba | 2341 | AA_SFS_FILE_STRING("version", "1.2"), |
e74abcf3 KC |
2342 | { } |
2343 | }; | |
2344 | ||
c97204ba JJ |
2345 | static struct aa_sfs_entry aa_sfs_entry_versions[] = { |
2346 | AA_SFS_FILE_BOOLEAN("v5", 1), | |
5379a331 JJ |
2347 | AA_SFS_FILE_BOOLEAN("v6", 1), |
2348 | AA_SFS_FILE_BOOLEAN("v7", 1), | |
56974a6f | 2349 | AA_SFS_FILE_BOOLEAN("v8", 1), |
f567e7fa | 2350 | AA_SFS_FILE_BOOLEAN("v9", 1), |
474d6b75 JJ |
2351 | { } |
2352 | }; | |
2353 | ||
c97204ba JJ |
2354 | static struct aa_sfs_entry aa_sfs_entry_policy[] = { |
2355 | AA_SFS_DIR("versions", aa_sfs_entry_versions), | |
2356 | AA_SFS_FILE_BOOLEAN("set_load", 1), | |
0df34a64 JJ |
2357 | /* number of out of band transitions supported */ |
2358 | AA_SFS_FILE_U64("outofband", MAX_OOB_SUPPORTED), | |
474d6b75 | 2359 | { } |
9d910a3b JJ |
2360 | }; |
2361 | ||
2ea3ffb7 JJ |
2362 | static struct aa_sfs_entry aa_sfs_entry_mount[] = { |
2363 | AA_SFS_FILE_STRING("mask", "mount umount pivot_root"), | |
2364 | { } | |
2365 | }; | |
2366 | ||
33f2eada JJ |
2367 | static struct aa_sfs_entry aa_sfs_entry_ns[] = { |
2368 | AA_SFS_FILE_BOOLEAN("profile", 1), | |
2ea3ffb7 | 2369 | AA_SFS_FILE_BOOLEAN("pivot_root", 0), |
33f2eada JJ |
2370 | { } |
2371 | }; | |
2372 | ||
a83bd86e | 2373 | static struct aa_sfs_entry aa_sfs_entry_query_label[] = { |
4f3b3f2d | 2374 | AA_SFS_FILE_STRING("perms", "allow deny audit quiet"), |
a83bd86e | 2375 | AA_SFS_FILE_BOOLEAN("data", 1), |
1dea3b41 | 2376 | AA_SFS_FILE_BOOLEAN("multi_transaction", 1), |
a83bd86e JJ |
2377 | { } |
2378 | }; | |
2379 | ||
2380 | static struct aa_sfs_entry aa_sfs_entry_query[] = { | |
2381 | AA_SFS_DIR("label", aa_sfs_entry_query_label), | |
2382 | { } | |
2383 | }; | |
c97204ba JJ |
2384 | static struct aa_sfs_entry aa_sfs_entry_features[] = { |
2385 | AA_SFS_DIR("policy", aa_sfs_entry_policy), | |
2386 | AA_SFS_DIR("domain", aa_sfs_entry_domain), | |
2387 | AA_SFS_DIR("file", aa_sfs_entry_file), | |
56974a6f | 2388 | AA_SFS_DIR("network_v8", aa_sfs_entry_network), |
2ea3ffb7 | 2389 | AA_SFS_DIR("mount", aa_sfs_entry_mount), |
33f2eada | 2390 | AA_SFS_DIR("namespaces", aa_sfs_entry_ns), |
c97204ba JJ |
2391 | AA_SFS_FILE_U64("capability", VFS_CAP_FLAGS_MASK), |
2392 | AA_SFS_DIR("rlimit", aa_sfs_entry_rlimit), | |
2393 | AA_SFS_DIR("caps", aa_sfs_entry_caps), | |
290f458a | 2394 | AA_SFS_DIR("ptrace", aa_sfs_entry_ptrace), |
cd1dbf76 | 2395 | AA_SFS_DIR("signal", aa_sfs_entry_signal), |
a83bd86e | 2396 | AA_SFS_DIR("query", aa_sfs_entry_query), |
e74abcf3 KC |
2397 | { } |
2398 | }; | |
2399 | ||
c97204ba | 2400 | static struct aa_sfs_entry aa_sfs_entry_apparmor[] = { |
bf81100f | 2401 | AA_SFS_FILE_FOPS(".access", 0666, &aa_sfs_access), |
6c5fc8f1 JJ |
2402 | AA_SFS_FILE_FOPS(".stacked", 0444, &seq_ns_stacked_fops), |
2403 | AA_SFS_FILE_FOPS(".ns_stacked", 0444, &seq_ns_nsstacked_fops), | |
bf81100f JJ |
2404 | AA_SFS_FILE_FOPS(".ns_level", 0444, &seq_ns_level_fops), |
2405 | AA_SFS_FILE_FOPS(".ns_name", 0444, &seq_ns_name_fops), | |
2406 | AA_SFS_FILE_FOPS("profiles", 0444, &aa_sfs_profiles_fops), | |
2218d081 JT |
2407 | AA_SFS_FILE_FOPS("raw_data_compression_level_min", 0444, &seq_ns_compress_min_fops), |
2408 | AA_SFS_FILE_FOPS("raw_data_compression_level_max", 0444, &seq_ns_compress_max_fops), | |
c97204ba | 2409 | AA_SFS_DIR("features", aa_sfs_entry_features), |
9acd494b KC |
2410 | { } |
2411 | }; | |
63e2b423 | 2412 | |
c97204ba JJ |
2413 | static struct aa_sfs_entry aa_sfs_entry = |
2414 | AA_SFS_DIR("apparmor", aa_sfs_entry_apparmor); | |
63e2b423 | 2415 | |
9acd494b | 2416 | /** |
a481f4d9 | 2417 | * entry_create_file - create a file entry in the apparmor securityfs |
c97204ba | 2418 | * @fs_file: aa_sfs_entry to build an entry for (NOT NULL) |
9acd494b KC |
2419 | * @parent: the parent dentry in the securityfs |
2420 | * | |
a481f4d9 | 2421 | * Use entry_remove_file to remove entries created with this fn. |
9acd494b | 2422 | */ |
c97204ba | 2423 | static int __init entry_create_file(struct aa_sfs_entry *fs_file, |
a481f4d9 | 2424 | struct dentry *parent) |
9acd494b KC |
2425 | { |
2426 | int error = 0; | |
2427 | ||
2428 | fs_file->dentry = securityfs_create_file(fs_file->name, | |
2429 | S_IFREG | fs_file->mode, | |
2430 | parent, fs_file, | |
2431 | fs_file->file_ops); | |
2432 | if (IS_ERR(fs_file->dentry)) { | |
2433 | error = PTR_ERR(fs_file->dentry); | |
2434 | fs_file->dentry = NULL; | |
63e2b423 | 2435 | } |
9acd494b | 2436 | return error; |
63e2b423 JJ |
2437 | } |
2438 | ||
c97204ba | 2439 | static void __init entry_remove_dir(struct aa_sfs_entry *fs_dir); |
63e2b423 | 2440 | /** |
a481f4d9 | 2441 | * entry_create_dir - recursively create a directory entry in the securityfs |
c97204ba | 2442 | * @fs_dir: aa_sfs_entry (and all child entries) to build (NOT NULL) |
9acd494b | 2443 | * @parent: the parent dentry in the securityfs |
63e2b423 | 2444 | * |
a481f4d9 | 2445 | * Use entry_remove_dir to remove entries created with this fn. |
63e2b423 | 2446 | */ |
c97204ba JJ |
2447 | static int __init entry_create_dir(struct aa_sfs_entry *fs_dir, |
2448 | struct dentry *parent) | |
63e2b423 | 2449 | { |
c97204ba | 2450 | struct aa_sfs_entry *fs_file; |
0d259f04 JJ |
2451 | struct dentry *dir; |
2452 | int error; | |
63e2b423 | 2453 | |
0d259f04 JJ |
2454 | dir = securityfs_create_dir(fs_dir->name, parent); |
2455 | if (IS_ERR(dir)) | |
2456 | return PTR_ERR(dir); | |
2457 | fs_dir->dentry = dir; | |
63e2b423 | 2458 | |
0d259f04 | 2459 | for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) { |
c97204ba | 2460 | if (fs_file->v_type == AA_SFS_TYPE_DIR) |
a481f4d9 | 2461 | error = entry_create_dir(fs_file, fs_dir->dentry); |
9acd494b | 2462 | else |
a481f4d9 | 2463 | error = entry_create_file(fs_file, fs_dir->dentry); |
9acd494b KC |
2464 | if (error) |
2465 | goto failed; | |
2466 | } | |
2467 | ||
2468 | return 0; | |
2469 | ||
2470 | failed: | |
a481f4d9 | 2471 | entry_remove_dir(fs_dir); |
0d259f04 | 2472 | |
9acd494b KC |
2473 | return error; |
2474 | } | |
2475 | ||
2476 | /** | |
c97204ba JJ |
2477 | * entry_remove_file - drop a single file entry in the apparmor securityfs |
2478 | * @fs_file: aa_sfs_entry to detach from the securityfs (NOT NULL) | |
9acd494b | 2479 | */ |
c97204ba | 2480 | static void __init entry_remove_file(struct aa_sfs_entry *fs_file) |
9acd494b KC |
2481 | { |
2482 | if (!fs_file->dentry) | |
2483 | return; | |
2484 | ||
2485 | securityfs_remove(fs_file->dentry); | |
2486 | fs_file->dentry = NULL; | |
2487 | } | |
2488 | ||
2489 | /** | |
a481f4d9 | 2490 | * entry_remove_dir - recursively drop a directory entry from the securityfs |
c97204ba | 2491 | * @fs_dir: aa_sfs_entry (and all child entries) to detach (NOT NULL) |
9acd494b | 2492 | */ |
c97204ba | 2493 | static void __init entry_remove_dir(struct aa_sfs_entry *fs_dir) |
9acd494b | 2494 | { |
c97204ba | 2495 | struct aa_sfs_entry *fs_file; |
9acd494b | 2496 | |
0d259f04 | 2497 | for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) { |
c97204ba | 2498 | if (fs_file->v_type == AA_SFS_TYPE_DIR) |
a481f4d9 | 2499 | entry_remove_dir(fs_file); |
9acd494b | 2500 | else |
c97204ba | 2501 | entry_remove_file(fs_file); |
9acd494b KC |
2502 | } |
2503 | ||
c97204ba | 2504 | entry_remove_file(fs_dir); |
63e2b423 JJ |
2505 | } |
2506 | ||
2507 | /** | |
2508 | * aa_destroy_aafs - cleanup and free aafs | |
2509 | * | |
2510 | * releases dentries allocated by aa_create_aafs | |
2511 | */ | |
2512 | void __init aa_destroy_aafs(void) | |
2513 | { | |
c97204ba | 2514 | entry_remove_dir(&aa_sfs_entry); |
63e2b423 JJ |
2515 | } |
2516 | ||
a71ada30 JJ |
2517 | |
2518 | #define NULL_FILE_NAME ".null" | |
2519 | struct path aa_null; | |
2520 | ||
2521 | static int aa_mk_null_file(struct dentry *parent) | |
2522 | { | |
2523 | struct vfsmount *mount = NULL; | |
2524 | struct dentry *dentry; | |
2525 | struct inode *inode; | |
2526 | int count = 0; | |
2527 | int error = simple_pin_fs(parent->d_sb->s_type, &mount, &count); | |
2528 | ||
2529 | if (error) | |
2530 | return error; | |
2531 | ||
2532 | inode_lock(d_inode(parent)); | |
2533 | dentry = lookup_one_len(NULL_FILE_NAME, parent, strlen(NULL_FILE_NAME)); | |
2534 | if (IS_ERR(dentry)) { | |
2535 | error = PTR_ERR(dentry); | |
2536 | goto out; | |
2537 | } | |
2538 | inode = new_inode(parent->d_inode->i_sb); | |
2539 | if (!inode) { | |
2540 | error = -ENOMEM; | |
2541 | goto out1; | |
2542 | } | |
2543 | ||
2544 | inode->i_ino = get_next_ino(); | |
2545 | inode->i_mode = S_IFCHR | S_IRUGO | S_IWUGO; | |
6ac54226 | 2546 | inode->i_atime = inode->i_mtime = inode_set_ctime_current(inode); |
a71ada30 JJ |
2547 | init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, |
2548 | MKDEV(MEM_MAJOR, 3)); | |
2549 | d_instantiate(dentry, inode); | |
2550 | aa_null.dentry = dget(dentry); | |
2551 | aa_null.mnt = mntget(mount); | |
2552 | ||
2553 | error = 0; | |
2554 | ||
2555 | out1: | |
2556 | dput(dentry); | |
2557 | out: | |
2558 | inode_unlock(d_inode(parent)); | |
2559 | simple_release_fs(&mount, &count); | |
2560 | return error; | |
2561 | } | |
2562 | ||
a481f4d9 JJ |
2563 | |
2564 | ||
2565 | static const char *policy_get_link(struct dentry *dentry, | |
2566 | struct inode *inode, | |
2567 | struct delayed_call *done) | |
2568 | { | |
2569 | struct aa_ns *ns; | |
2570 | struct path path; | |
1bc82070 | 2571 | int error; |
a481f4d9 JJ |
2572 | |
2573 | if (!dentry) | |
2574 | return ERR_PTR(-ECHILD); | |
1bc82070 | 2575 | |
a481f4d9 JJ |
2576 | ns = aa_get_current_ns(); |
2577 | path.mnt = mntget(aafs_mnt); | |
2578 | path.dentry = dget(ns_dir(ns)); | |
1bc82070 | 2579 | error = nd_jump_link(&path); |
a481f4d9 JJ |
2580 | aa_put_ns(ns); |
2581 | ||
1bc82070 | 2582 | return ERR_PTR(error); |
a481f4d9 JJ |
2583 | } |
2584 | ||
a481f4d9 JJ |
2585 | static int policy_readlink(struct dentry *dentry, char __user *buffer, |
2586 | int buflen) | |
2587 | { | |
a481f4d9 JJ |
2588 | char name[32]; |
2589 | int res; | |
2590 | ||
a0781209 JJ |
2591 | res = snprintf(name, sizeof(name), "%s:[%lu]", AAFS_NAME, |
2592 | d_inode(dentry)->i_ino); | |
2593 | if (res > 0 && res < sizeof(name)) | |
a481f4d9 | 2594 | res = readlink_copy(buffer, buflen, name); |
a0781209 JJ |
2595 | else |
2596 | res = -ENOENT; | |
a481f4d9 JJ |
2597 | |
2598 | return res; | |
2599 | } | |
2600 | ||
2601 | static const struct inode_operations policy_link_iops = { | |
2602 | .readlink = policy_readlink, | |
2603 | .get_link = policy_get_link, | |
2604 | }; | |
2605 | ||
2606 | ||
63e2b423 JJ |
2607 | /** |
2608 | * aa_create_aafs - create the apparmor security filesystem | |
2609 | * | |
2610 | * dentries created here are released by aa_destroy_aafs | |
2611 | * | |
2612 | * Returns: error on failure | |
2613 | */ | |
3417d8d5 | 2614 | static int __init aa_create_aafs(void) |
63e2b423 | 2615 | { |
b7fd2c03 | 2616 | struct dentry *dent; |
63e2b423 JJ |
2617 | int error; |
2618 | ||
2619 | if (!apparmor_initialized) | |
2620 | return 0; | |
2621 | ||
c97204ba | 2622 | if (aa_sfs_entry.dentry) { |
63e2b423 JJ |
2623 | AA_ERROR("%s: AppArmor securityfs already exists\n", __func__); |
2624 | return -EEXIST; | |
2625 | } | |
2626 | ||
a481f4d9 JJ |
2627 | /* setup apparmorfs used to virtualize policy/ */ |
2628 | aafs_mnt = kern_mount(&aafs_ops); | |
2629 | if (IS_ERR(aafs_mnt)) | |
2630 | panic("can't set apparmorfs up\n"); | |
1751e8a6 | 2631 | aafs_mnt->mnt_sb->s_flags &= ~SB_NOUSER; |
a481f4d9 | 2632 | |
9acd494b | 2633 | /* Populate fs tree. */ |
c97204ba | 2634 | error = entry_create_dir(&aa_sfs_entry, NULL); |
63e2b423 JJ |
2635 | if (error) |
2636 | goto error; | |
2637 | ||
c97204ba | 2638 | dent = securityfs_create_file(".load", 0666, aa_sfs_entry.dentry, |
b7fd2c03 | 2639 | NULL, &aa_fs_profile_load); |
cf916000 JJ |
2640 | if (IS_ERR(dent)) |
2641 | goto dent_error; | |
b7fd2c03 JJ |
2642 | ns_subload(root_ns) = dent; |
2643 | ||
c97204ba | 2644 | dent = securityfs_create_file(".replace", 0666, aa_sfs_entry.dentry, |
b7fd2c03 | 2645 | NULL, &aa_fs_profile_replace); |
cf916000 JJ |
2646 | if (IS_ERR(dent)) |
2647 | goto dent_error; | |
b7fd2c03 JJ |
2648 | ns_subreplace(root_ns) = dent; |
2649 | ||
c97204ba | 2650 | dent = securityfs_create_file(".remove", 0666, aa_sfs_entry.dentry, |
b7fd2c03 | 2651 | NULL, &aa_fs_profile_remove); |
cf916000 JJ |
2652 | if (IS_ERR(dent)) |
2653 | goto dent_error; | |
b7fd2c03 JJ |
2654 | ns_subremove(root_ns) = dent; |
2655 | ||
d9bf2c26 JJ |
2656 | dent = securityfs_create_file("revision", 0444, aa_sfs_entry.dentry, |
2657 | NULL, &aa_fs_ns_revision_fops); | |
cf916000 JJ |
2658 | if (IS_ERR(dent)) |
2659 | goto dent_error; | |
d9bf2c26 JJ |
2660 | ns_subrevision(root_ns) = dent; |
2661 | ||
2662 | /* policy tree referenced by magic policy symlink */ | |
feb3c766 | 2663 | mutex_lock_nested(&root_ns->lock, root_ns->level); |
c961ee5f JJ |
2664 | error = __aafs_ns_mkdir(root_ns, aafs_mnt->mnt_root, ".policy", |
2665 | aafs_mnt->mnt_root); | |
b7fd2c03 | 2666 | mutex_unlock(&root_ns->lock); |
0d259f04 JJ |
2667 | if (error) |
2668 | goto error; | |
2669 | ||
c961ee5f JJ |
2670 | /* magic symlink similar to nsfs redirects based on task policy */ |
2671 | dent = securityfs_create_symlink("policy", aa_sfs_entry.dentry, | |
2672 | NULL, &policy_link_iops); | |
cf916000 JJ |
2673 | if (IS_ERR(dent)) |
2674 | goto dent_error; | |
c961ee5f | 2675 | |
c97204ba | 2676 | error = aa_mk_null_file(aa_sfs_entry.dentry); |
a71ada30 JJ |
2677 | if (error) |
2678 | goto error; | |
2679 | ||
2680 | /* TODO: add default profile to apparmorfs */ | |
63e2b423 JJ |
2681 | |
2682 | /* Report that AppArmor fs is enabled */ | |
2683 | aa_info_message("AppArmor Filesystem Enabled"); | |
2684 | return 0; | |
2685 | ||
cf916000 JJ |
2686 | dent_error: |
2687 | error = PTR_ERR(dent); | |
63e2b423 JJ |
2688 | error: |
2689 | aa_destroy_aafs(); | |
2690 | AA_ERROR("Error creating AppArmor securityfs\n"); | |
2691 | return error; | |
2692 | } | |
2693 | ||
2694 | fs_initcall(aa_create_aafs); |