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85c8721f | 1 | /* auditsc.c -- System-call auditing support |
1da177e4 LT |
2 | * Handles all system-call specific auditing features. |
3 | * | |
4 | * Copyright 2003-2004 Red Hat Inc., Durham, North Carolina. | |
5 | * All Rights Reserved. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
20 | * | |
21 | * Written by Rickard E. (Rik) Faith <faith@redhat.com> | |
22 | * | |
23 | * Many of the ideas implemented here are from Stephen C. Tweedie, | |
24 | * especially the idea of avoiding a copy by using getname. | |
25 | * | |
26 | * The method for actual interception of syscall entry and exit (not in | |
27 | * this file -- see entry.S) is based on a GPL'd patch written by | |
28 | * okir@suse.de and Copyright 2003 SuSE Linux AG. | |
29 | * | |
30 | */ | |
31 | ||
32 | #include <linux/init.h> | |
33 | #include <asm/atomic.h> | |
34 | #include <asm/types.h> | |
35 | #include <linux/mm.h> | |
36 | #include <linux/module.h> | |
01116105 | 37 | #include <linux/mount.h> |
3ec3b2fb | 38 | #include <linux/socket.h> |
1da177e4 LT |
39 | #include <linux/audit.h> |
40 | #include <linux/personality.h> | |
41 | #include <linux/time.h> | |
f6a789d1 | 42 | #include <linux/kthread.h> |
5bb289b5 | 43 | #include <linux/netlink.h> |
1da177e4 LT |
44 | #include <asm/unistd.h> |
45 | ||
46 | /* 0 = no checking | |
47 | 1 = put_count checking | |
48 | 2 = verbose put_count checking | |
49 | */ | |
50 | #define AUDIT_DEBUG 0 | |
51 | ||
52 | /* No syscall auditing will take place unless audit_enabled != 0. */ | |
53 | extern int audit_enabled; | |
54 | ||
55 | /* AUDIT_NAMES is the number of slots we reserve in the audit_context | |
56 | * for saving names from getname(). */ | |
57 | #define AUDIT_NAMES 20 | |
58 | ||
59 | /* AUDIT_NAMES_RESERVED is the number of slots we reserve in the | |
60 | * audit_context from being used for nameless inodes from | |
61 | * path_lookup. */ | |
62 | #define AUDIT_NAMES_RESERVED 7 | |
63 | ||
64 | /* At task start time, the audit_state is set in the audit_context using | |
65 | a per-task filter. At syscall entry, the audit_state is augmented by | |
66 | the syscall filter. */ | |
67 | enum audit_state { | |
68 | AUDIT_DISABLED, /* Do not create per-task audit_context. | |
69 | * No syscall-specific audit records can | |
70 | * be generated. */ | |
71 | AUDIT_SETUP_CONTEXT, /* Create the per-task audit_context, | |
72 | * but don't necessarily fill it in at | |
73 | * syscall entry time (i.e., filter | |
74 | * instead). */ | |
75 | AUDIT_BUILD_CONTEXT, /* Create the per-task audit_context, | |
76 | * and always fill it in at syscall | |
77 | * entry time. This makes a full | |
78 | * syscall record available if some | |
79 | * other part of the kernel decides it | |
80 | * should be recorded. */ | |
81 | AUDIT_RECORD_CONTEXT /* Create the per-task audit_context, | |
82 | * always fill it in at syscall entry | |
83 | * time, and always write out the audit | |
84 | * record at syscall exit time. */ | |
85 | }; | |
86 | ||
87 | /* When fs/namei.c:getname() is called, we store the pointer in name and | |
88 | * we don't let putname() free it (instead we free all of the saved | |
89 | * pointers at syscall exit time). | |
90 | * | |
91 | * Further, in fs/namei.c:path_lookup() we store the inode and device. */ | |
92 | struct audit_names { | |
93 | const char *name; | |
94 | unsigned long ino; | |
95 | dev_t dev; | |
96 | umode_t mode; | |
97 | uid_t uid; | |
98 | gid_t gid; | |
99 | dev_t rdev; | |
ae7b961b | 100 | unsigned flags; |
1da177e4 LT |
101 | }; |
102 | ||
103 | struct audit_aux_data { | |
104 | struct audit_aux_data *next; | |
105 | int type; | |
106 | }; | |
107 | ||
108 | #define AUDIT_AUX_IPCPERM 0 | |
109 | ||
110 | struct audit_aux_data_ipcctl { | |
111 | struct audit_aux_data d; | |
112 | struct ipc_perm p; | |
113 | unsigned long qbytes; | |
114 | uid_t uid; | |
115 | gid_t gid; | |
116 | mode_t mode; | |
117 | }; | |
118 | ||
3ec3b2fb DW |
119 | struct audit_aux_data_socketcall { |
120 | struct audit_aux_data d; | |
121 | int nargs; | |
122 | unsigned long args[0]; | |
123 | }; | |
124 | ||
125 | struct audit_aux_data_sockaddr { | |
126 | struct audit_aux_data d; | |
127 | int len; | |
128 | char a[0]; | |
129 | }; | |
130 | ||
01116105 SS |
131 | struct audit_aux_data_path { |
132 | struct audit_aux_data d; | |
133 | struct dentry *dentry; | |
134 | struct vfsmount *mnt; | |
135 | }; | |
1da177e4 LT |
136 | |
137 | /* The per-task audit context. */ | |
138 | struct audit_context { | |
139 | int in_syscall; /* 1 if task is in a syscall */ | |
140 | enum audit_state state; | |
141 | unsigned int serial; /* serial number for record */ | |
142 | struct timespec ctime; /* time of syscall entry */ | |
143 | uid_t loginuid; /* login uid (identity) */ | |
144 | int major; /* syscall number */ | |
145 | unsigned long argv[4]; /* syscall arguments */ | |
146 | int return_valid; /* return code is valid */ | |
2fd6f58b | 147 | long return_code;/* syscall return code */ |
1da177e4 LT |
148 | int auditable; /* 1 if record should be written */ |
149 | int name_count; | |
150 | struct audit_names names[AUDIT_NAMES]; | |
8f37d47c DW |
151 | struct dentry * pwd; |
152 | struct vfsmount * pwdmnt; | |
1da177e4 LT |
153 | struct audit_context *previous; /* For nested syscalls */ |
154 | struct audit_aux_data *aux; | |
155 | ||
156 | /* Save things to print about task_struct */ | |
157 | pid_t pid; | |
158 | uid_t uid, euid, suid, fsuid; | |
159 | gid_t gid, egid, sgid, fsgid; | |
160 | unsigned long personality; | |
2fd6f58b | 161 | int arch; |
1da177e4 LT |
162 | |
163 | #if AUDIT_DEBUG | |
164 | int put_count; | |
165 | int ino_count; | |
166 | #endif | |
167 | }; | |
168 | ||
169 | /* Public API */ | |
170 | /* There are three lists of rules -- one to search at task creation | |
171 | * time, one to search at syscall entry time, and another to search at | |
172 | * syscall exit time. */ | |
0f45aa18 DW |
173 | static struct list_head audit_filter_list[AUDIT_NR_FILTERS] = { |
174 | LIST_HEAD_INIT(audit_filter_list[0]), | |
175 | LIST_HEAD_INIT(audit_filter_list[1]), | |
176 | LIST_HEAD_INIT(audit_filter_list[2]), | |
177 | LIST_HEAD_INIT(audit_filter_list[3]), | |
178 | LIST_HEAD_INIT(audit_filter_list[4]), | |
179 | #if AUDIT_NR_FILTERS != 5 | |
180 | #error Fix audit_filter_list initialiser | |
181 | #endif | |
182 | }; | |
1da177e4 LT |
183 | |
184 | struct audit_entry { | |
185 | struct list_head list; | |
186 | struct rcu_head rcu; | |
187 | struct audit_rule rule; | |
188 | }; | |
189 | ||
7ca00264 DW |
190 | extern int audit_pid; |
191 | ||
1da177e4 LT |
192 | /* Check to see if two rules are identical. It is called from |
193 | * audit_del_rule during AUDIT_DEL. */ | |
194 | static int audit_compare_rule(struct audit_rule *a, struct audit_rule *b) | |
195 | { | |
196 | int i; | |
197 | ||
198 | if (a->flags != b->flags) | |
199 | return 1; | |
200 | ||
201 | if (a->action != b->action) | |
202 | return 1; | |
203 | ||
204 | if (a->field_count != b->field_count) | |
205 | return 1; | |
206 | ||
207 | for (i = 0; i < a->field_count; i++) { | |
208 | if (a->fields[i] != b->fields[i] | |
209 | || a->values[i] != b->values[i]) | |
210 | return 1; | |
211 | } | |
212 | ||
213 | for (i = 0; i < AUDIT_BITMASK_SIZE; i++) | |
214 | if (a->mask[i] != b->mask[i]) | |
215 | return 1; | |
216 | ||
217 | return 0; | |
218 | } | |
219 | ||
220 | /* Note that audit_add_rule and audit_del_rule are called via | |
221 | * audit_receive() in audit.c, and are protected by | |
222 | * audit_netlink_sem. */ | |
0f45aa18 DW |
223 | static inline void audit_add_rule(struct audit_entry *entry, |
224 | struct list_head *list) | |
1da177e4 | 225 | { |
0f45aa18 DW |
226 | if (entry->rule.flags & AUDIT_FILTER_PREPEND) { |
227 | entry->rule.flags &= ~AUDIT_FILTER_PREPEND; | |
1da177e4 LT |
228 | list_add_rcu(&entry->list, list); |
229 | } else { | |
230 | list_add_tail_rcu(&entry->list, list); | |
231 | } | |
1da177e4 LT |
232 | } |
233 | ||
234 | static void audit_free_rule(struct rcu_head *head) | |
235 | { | |
236 | struct audit_entry *e = container_of(head, struct audit_entry, rcu); | |
237 | kfree(e); | |
238 | } | |
239 | ||
240 | /* Note that audit_add_rule and audit_del_rule are called via | |
241 | * audit_receive() in audit.c, and are protected by | |
242 | * audit_netlink_sem. */ | |
243 | static inline int audit_del_rule(struct audit_rule *rule, | |
244 | struct list_head *list) | |
245 | { | |
246 | struct audit_entry *e; | |
247 | ||
248 | /* Do not use the _rcu iterator here, since this is the only | |
249 | * deletion routine. */ | |
250 | list_for_each_entry(e, list, list) { | |
251 | if (!audit_compare_rule(rule, &e->rule)) { | |
252 | list_del_rcu(&e->list); | |
253 | call_rcu(&e->rcu, audit_free_rule); | |
254 | return 0; | |
255 | } | |
256 | } | |
0f45aa18 | 257 | return -ENOENT; /* No matching rule */ |
1da177e4 LT |
258 | } |
259 | ||
1da177e4 LT |
260 | /* Copy rule from user-space to kernel-space. Called during |
261 | * AUDIT_ADD. */ | |
262 | static int audit_copy_rule(struct audit_rule *d, struct audit_rule *s) | |
263 | { | |
264 | int i; | |
265 | ||
266 | if (s->action != AUDIT_NEVER | |
267 | && s->action != AUDIT_POSSIBLE | |
268 | && s->action != AUDIT_ALWAYS) | |
269 | return -1; | |
270 | if (s->field_count < 0 || s->field_count > AUDIT_MAX_FIELDS) | |
271 | return -1; | |
0f45aa18 DW |
272 | if ((s->flags & ~AUDIT_FILTER_PREPEND) >= AUDIT_NR_FILTERS) |
273 | return -1; | |
1da177e4 LT |
274 | |
275 | d->flags = s->flags; | |
276 | d->action = s->action; | |
277 | d->field_count = s->field_count; | |
278 | for (i = 0; i < d->field_count; i++) { | |
279 | d->fields[i] = s->fields[i]; | |
280 | d->values[i] = s->values[i]; | |
281 | } | |
282 | for (i = 0; i < AUDIT_BITMASK_SIZE; i++) d->mask[i] = s->mask[i]; | |
283 | return 0; | |
284 | } | |
285 | ||
f6a789d1 DW |
286 | static int audit_list_rules(void *_dest) |
287 | { | |
288 | int pid, seq; | |
289 | int *dest = _dest; | |
290 | struct audit_entry *entry; | |
291 | int i; | |
292 | ||
293 | pid = dest[0]; | |
294 | seq = dest[1]; | |
295 | kfree(dest); | |
296 | ||
297 | down(&audit_netlink_sem); | |
298 | ||
299 | /* The *_rcu iterators not needed here because we are | |
300 | always called with audit_netlink_sem held. */ | |
301 | for (i=0; i<AUDIT_NR_FILTERS; i++) { | |
302 | list_for_each_entry(entry, &audit_filter_list[i], list) | |
303 | audit_send_reply(pid, seq, AUDIT_LIST, 0, 1, | |
304 | &entry->rule, sizeof(entry->rule)); | |
305 | } | |
306 | audit_send_reply(pid, seq, AUDIT_LIST, 1, 1, NULL, 0); | |
307 | ||
308 | up(&audit_netlink_sem); | |
309 | return 0; | |
310 | } | |
311 | ||
c94c257c SH |
312 | int audit_receive_filter(int type, int pid, int uid, int seq, void *data, |
313 | uid_t loginuid) | |
1da177e4 | 314 | { |
1da177e4 | 315 | struct audit_entry *entry; |
f6a789d1 DW |
316 | struct task_struct *tsk; |
317 | int *dest; | |
1da177e4 | 318 | int err = 0; |
0f45aa18 | 319 | unsigned listnr; |
1da177e4 LT |
320 | |
321 | switch (type) { | |
322 | case AUDIT_LIST: | |
f6a789d1 DW |
323 | /* We can't just spew out the rules here because we might fill |
324 | * the available socket buffer space and deadlock waiting for | |
325 | * auditctl to read from it... which isn't ever going to | |
326 | * happen if we're actually running in the context of auditctl | |
327 | * trying to _send_ the stuff */ | |
328 | ||
329 | dest = kmalloc(2 * sizeof(int), GFP_KERNEL); | |
330 | if (!dest) | |
331 | return -ENOMEM; | |
332 | dest[0] = pid; | |
333 | dest[1] = seq; | |
334 | ||
335 | tsk = kthread_run(audit_list_rules, dest, "audit_list_rules"); | |
336 | if (IS_ERR(tsk)) { | |
337 | kfree(dest); | |
338 | err = PTR_ERR(tsk); | |
0f45aa18 | 339 | } |
1da177e4 LT |
340 | break; |
341 | case AUDIT_ADD: | |
342 | if (!(entry = kmalloc(sizeof(*entry), GFP_KERNEL))) | |
343 | return -ENOMEM; | |
344 | if (audit_copy_rule(&entry->rule, data)) { | |
345 | kfree(entry); | |
346 | return -EINVAL; | |
347 | } | |
0f45aa18 DW |
348 | listnr = entry->rule.flags & ~AUDIT_FILTER_PREPEND; |
349 | audit_add_rule(entry, &audit_filter_list[listnr]); | |
9ad9ad38 | 350 | audit_log(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE, |
bccf6ae0 | 351 | "auid=%u added an audit rule\n", loginuid); |
1da177e4 LT |
352 | break; |
353 | case AUDIT_DEL: | |
0f45aa18 DW |
354 | listnr =((struct audit_rule *)data)->flags & ~AUDIT_FILTER_PREPEND; |
355 | if (listnr >= AUDIT_NR_FILTERS) | |
356 | return -EINVAL; | |
357 | ||
358 | err = audit_del_rule(data, &audit_filter_list[listnr]); | |
359 | if (!err) | |
9ad9ad38 | 360 | audit_log(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE, |
0f45aa18 | 361 | "auid=%u removed an audit rule\n", loginuid); |
1da177e4 LT |
362 | break; |
363 | default: | |
364 | return -EINVAL; | |
365 | } | |
366 | ||
367 | return err; | |
368 | } | |
1da177e4 LT |
369 | |
370 | /* Compare a task_struct with an audit_rule. Return 1 on match, 0 | |
371 | * otherwise. */ | |
372 | static int audit_filter_rules(struct task_struct *tsk, | |
373 | struct audit_rule *rule, | |
374 | struct audit_context *ctx, | |
375 | enum audit_state *state) | |
376 | { | |
377 | int i, j; | |
378 | ||
379 | for (i = 0; i < rule->field_count; i++) { | |
380 | u32 field = rule->fields[i] & ~AUDIT_NEGATE; | |
381 | u32 value = rule->values[i]; | |
382 | int result = 0; | |
383 | ||
384 | switch (field) { | |
385 | case AUDIT_PID: | |
386 | result = (tsk->pid == value); | |
387 | break; | |
388 | case AUDIT_UID: | |
389 | result = (tsk->uid == value); | |
390 | break; | |
391 | case AUDIT_EUID: | |
392 | result = (tsk->euid == value); | |
393 | break; | |
394 | case AUDIT_SUID: | |
395 | result = (tsk->suid == value); | |
396 | break; | |
397 | case AUDIT_FSUID: | |
398 | result = (tsk->fsuid == value); | |
399 | break; | |
400 | case AUDIT_GID: | |
401 | result = (tsk->gid == value); | |
402 | break; | |
403 | case AUDIT_EGID: | |
404 | result = (tsk->egid == value); | |
405 | break; | |
406 | case AUDIT_SGID: | |
407 | result = (tsk->sgid == value); | |
408 | break; | |
409 | case AUDIT_FSGID: | |
410 | result = (tsk->fsgid == value); | |
411 | break; | |
412 | case AUDIT_PERS: | |
413 | result = (tsk->personality == value); | |
414 | break; | |
2fd6f58b | 415 | case AUDIT_ARCH: |
416 | if (ctx) | |
417 | result = (ctx->arch == value); | |
418 | break; | |
1da177e4 LT |
419 | |
420 | case AUDIT_EXIT: | |
421 | if (ctx && ctx->return_valid) | |
422 | result = (ctx->return_code == value); | |
423 | break; | |
424 | case AUDIT_SUCCESS: | |
425 | if (ctx && ctx->return_valid) | |
2fd6f58b | 426 | result = (ctx->return_valid == AUDITSC_SUCCESS); |
1da177e4 LT |
427 | break; |
428 | case AUDIT_DEVMAJOR: | |
429 | if (ctx) { | |
430 | for (j = 0; j < ctx->name_count; j++) { | |
431 | if (MAJOR(ctx->names[j].dev)==value) { | |
432 | ++result; | |
433 | break; | |
434 | } | |
435 | } | |
436 | } | |
437 | break; | |
438 | case AUDIT_DEVMINOR: | |
439 | if (ctx) { | |
440 | for (j = 0; j < ctx->name_count; j++) { | |
441 | if (MINOR(ctx->names[j].dev)==value) { | |
442 | ++result; | |
443 | break; | |
444 | } | |
445 | } | |
446 | } | |
447 | break; | |
448 | case AUDIT_INODE: | |
449 | if (ctx) { | |
450 | for (j = 0; j < ctx->name_count; j++) { | |
451 | if (ctx->names[j].ino == value) { | |
452 | ++result; | |
453 | break; | |
454 | } | |
455 | } | |
456 | } | |
457 | break; | |
458 | case AUDIT_LOGINUID: | |
459 | result = 0; | |
460 | if (ctx) | |
461 | result = (ctx->loginuid == value); | |
462 | break; | |
463 | case AUDIT_ARG0: | |
464 | case AUDIT_ARG1: | |
465 | case AUDIT_ARG2: | |
466 | case AUDIT_ARG3: | |
467 | if (ctx) | |
468 | result = (ctx->argv[field-AUDIT_ARG0]==value); | |
469 | break; | |
470 | } | |
471 | ||
472 | if (rule->fields[i] & AUDIT_NEGATE) | |
473 | result = !result; | |
474 | if (!result) | |
475 | return 0; | |
476 | } | |
477 | switch (rule->action) { | |
478 | case AUDIT_NEVER: *state = AUDIT_DISABLED; break; | |
479 | case AUDIT_POSSIBLE: *state = AUDIT_BUILD_CONTEXT; break; | |
480 | case AUDIT_ALWAYS: *state = AUDIT_RECORD_CONTEXT; break; | |
481 | } | |
482 | return 1; | |
483 | } | |
484 | ||
485 | /* At process creation time, we can determine if system-call auditing is | |
486 | * completely disabled for this task. Since we only have the task | |
487 | * structure at this point, we can only check uid and gid. | |
488 | */ | |
489 | static enum audit_state audit_filter_task(struct task_struct *tsk) | |
490 | { | |
491 | struct audit_entry *e; | |
492 | enum audit_state state; | |
493 | ||
494 | rcu_read_lock(); | |
0f45aa18 | 495 | list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_TASK], list) { |
1da177e4 LT |
496 | if (audit_filter_rules(tsk, &e->rule, NULL, &state)) { |
497 | rcu_read_unlock(); | |
498 | return state; | |
499 | } | |
500 | } | |
501 | rcu_read_unlock(); | |
502 | return AUDIT_BUILD_CONTEXT; | |
503 | } | |
504 | ||
505 | /* At syscall entry and exit time, this filter is called if the | |
506 | * audit_state is not low enough that auditing cannot take place, but is | |
23f32d18 | 507 | * also not high enough that we already know we have to write an audit |
1da177e4 LT |
508 | * record (i.e., the state is AUDIT_SETUP_CONTEXT or AUDIT_BUILD_CONTEXT). |
509 | */ | |
510 | static enum audit_state audit_filter_syscall(struct task_struct *tsk, | |
511 | struct audit_context *ctx, | |
512 | struct list_head *list) | |
513 | { | |
514 | struct audit_entry *e; | |
515 | enum audit_state state; | |
516 | int word = AUDIT_WORD(ctx->major); | |
517 | int bit = AUDIT_BIT(ctx->major); | |
518 | ||
582edda5 | 519 | if (audit_pid && tsk->tgid == audit_tgid) |
f7056d64 DW |
520 | return AUDIT_DISABLED; |
521 | ||
1da177e4 LT |
522 | rcu_read_lock(); |
523 | list_for_each_entry_rcu(e, list, list) { | |
524 | if ((e->rule.mask[word] & bit) == bit | |
525 | && audit_filter_rules(tsk, &e->rule, ctx, &state)) { | |
526 | rcu_read_unlock(); | |
527 | return state; | |
528 | } | |
529 | } | |
530 | rcu_read_unlock(); | |
531 | return AUDIT_BUILD_CONTEXT; | |
532 | } | |
533 | ||
5bb289b5 DW |
534 | static int audit_filter_user_rules(struct netlink_skb_parms *cb, |
535 | struct audit_rule *rule, | |
536 | enum audit_state *state) | |
537 | { | |
538 | int i; | |
539 | ||
540 | for (i = 0; i < rule->field_count; i++) { | |
541 | u32 field = rule->fields[i] & ~AUDIT_NEGATE; | |
542 | u32 value = rule->values[i]; | |
543 | int result = 0; | |
544 | ||
545 | switch (field) { | |
546 | case AUDIT_PID: | |
547 | result = (cb->creds.pid == value); | |
548 | break; | |
549 | case AUDIT_UID: | |
550 | result = (cb->creds.uid == value); | |
551 | break; | |
552 | case AUDIT_GID: | |
553 | result = (cb->creds.gid == value); | |
554 | break; | |
555 | case AUDIT_LOGINUID: | |
556 | result = (cb->loginuid == value); | |
557 | break; | |
558 | } | |
559 | ||
560 | if (rule->fields[i] & AUDIT_NEGATE) | |
561 | result = !result; | |
562 | if (!result) | |
563 | return 0; | |
564 | } | |
565 | switch (rule->action) { | |
566 | case AUDIT_NEVER: *state = AUDIT_DISABLED; break; | |
567 | case AUDIT_POSSIBLE: *state = AUDIT_BUILD_CONTEXT; break; | |
568 | case AUDIT_ALWAYS: *state = AUDIT_RECORD_CONTEXT; break; | |
569 | } | |
570 | return 1; | |
571 | } | |
572 | ||
573 | int audit_filter_user(struct netlink_skb_parms *cb, int type) | |
0f45aa18 DW |
574 | { |
575 | struct audit_entry *e; | |
576 | enum audit_state state; | |
4a4cd633 | 577 | int ret = 1; |
0f45aa18 DW |
578 | |
579 | rcu_read_lock(); | |
580 | list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_USER], list) { | |
5bb289b5 | 581 | if (audit_filter_user_rules(cb, &e->rule, &state)) { |
4a4cd633 DW |
582 | if (state == AUDIT_DISABLED) |
583 | ret = 0; | |
584 | break; | |
0f45aa18 DW |
585 | } |
586 | } | |
587 | rcu_read_unlock(); | |
4a4cd633 | 588 | |
993e2d41 | 589 | return ret; /* Audit by default */ |
0f45aa18 DW |
590 | } |
591 | ||
1da177e4 LT |
592 | /* This should be called with task_lock() held. */ |
593 | static inline struct audit_context *audit_get_context(struct task_struct *tsk, | |
594 | int return_valid, | |
595 | int return_code) | |
596 | { | |
597 | struct audit_context *context = tsk->audit_context; | |
598 | ||
599 | if (likely(!context)) | |
600 | return NULL; | |
601 | context->return_valid = return_valid; | |
602 | context->return_code = return_code; | |
603 | ||
21af6c4f | 604 | if (context->in_syscall && !context->auditable) { |
1da177e4 | 605 | enum audit_state state; |
0f45aa18 | 606 | state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_EXIT]); |
1da177e4 LT |
607 | if (state == AUDIT_RECORD_CONTEXT) |
608 | context->auditable = 1; | |
609 | } | |
610 | ||
611 | context->pid = tsk->pid; | |
612 | context->uid = tsk->uid; | |
613 | context->gid = tsk->gid; | |
614 | context->euid = tsk->euid; | |
615 | context->suid = tsk->suid; | |
616 | context->fsuid = tsk->fsuid; | |
617 | context->egid = tsk->egid; | |
618 | context->sgid = tsk->sgid; | |
619 | context->fsgid = tsk->fsgid; | |
620 | context->personality = tsk->personality; | |
621 | tsk->audit_context = NULL; | |
622 | return context; | |
623 | } | |
624 | ||
625 | static inline void audit_free_names(struct audit_context *context) | |
626 | { | |
627 | int i; | |
628 | ||
629 | #if AUDIT_DEBUG == 2 | |
630 | if (context->auditable | |
631 | ||context->put_count + context->ino_count != context->name_count) { | |
632 | printk(KERN_ERR "audit.c:%d(:%d): major=%d in_syscall=%d" | |
633 | " name_count=%d put_count=%d" | |
634 | " ino_count=%d [NOT freeing]\n", | |
635 | __LINE__, | |
636 | context->serial, context->major, context->in_syscall, | |
637 | context->name_count, context->put_count, | |
638 | context->ino_count); | |
639 | for (i = 0; i < context->name_count; i++) | |
640 | printk(KERN_ERR "names[%d] = %p = %s\n", i, | |
641 | context->names[i].name, | |
642 | context->names[i].name); | |
643 | dump_stack(); | |
644 | return; | |
645 | } | |
646 | #endif | |
647 | #if AUDIT_DEBUG | |
648 | context->put_count = 0; | |
649 | context->ino_count = 0; | |
650 | #endif | |
651 | ||
652 | for (i = 0; i < context->name_count; i++) | |
653 | if (context->names[i].name) | |
654 | __putname(context->names[i].name); | |
655 | context->name_count = 0; | |
8f37d47c DW |
656 | if (context->pwd) |
657 | dput(context->pwd); | |
658 | if (context->pwdmnt) | |
659 | mntput(context->pwdmnt); | |
660 | context->pwd = NULL; | |
661 | context->pwdmnt = NULL; | |
1da177e4 LT |
662 | } |
663 | ||
664 | static inline void audit_free_aux(struct audit_context *context) | |
665 | { | |
666 | struct audit_aux_data *aux; | |
667 | ||
668 | while ((aux = context->aux)) { | |
01116105 SS |
669 | if (aux->type == AUDIT_AVC_PATH) { |
670 | struct audit_aux_data_path *axi = (void *)aux; | |
671 | dput(axi->dentry); | |
672 | mntput(axi->mnt); | |
673 | } | |
1da177e4 LT |
674 | context->aux = aux->next; |
675 | kfree(aux); | |
676 | } | |
677 | } | |
678 | ||
679 | static inline void audit_zero_context(struct audit_context *context, | |
680 | enum audit_state state) | |
681 | { | |
682 | uid_t loginuid = context->loginuid; | |
683 | ||
684 | memset(context, 0, sizeof(*context)); | |
685 | context->state = state; | |
686 | context->loginuid = loginuid; | |
687 | } | |
688 | ||
689 | static inline struct audit_context *audit_alloc_context(enum audit_state state) | |
690 | { | |
691 | struct audit_context *context; | |
692 | ||
693 | if (!(context = kmalloc(sizeof(*context), GFP_KERNEL))) | |
694 | return NULL; | |
695 | audit_zero_context(context, state); | |
696 | return context; | |
697 | } | |
698 | ||
699 | /* Filter on the task information and allocate a per-task audit context | |
700 | * if necessary. Doing so turns on system call auditing for the | |
701 | * specified task. This is called from copy_process, so no lock is | |
702 | * needed. */ | |
703 | int audit_alloc(struct task_struct *tsk) | |
704 | { | |
705 | struct audit_context *context; | |
706 | enum audit_state state; | |
707 | ||
708 | if (likely(!audit_enabled)) | |
709 | return 0; /* Return if not auditing. */ | |
710 | ||
711 | state = audit_filter_task(tsk); | |
712 | if (likely(state == AUDIT_DISABLED)) | |
713 | return 0; | |
714 | ||
715 | if (!(context = audit_alloc_context(state))) { | |
716 | audit_log_lost("out of memory in audit_alloc"); | |
717 | return -ENOMEM; | |
718 | } | |
719 | ||
720 | /* Preserve login uid */ | |
721 | context->loginuid = -1; | |
722 | if (current->audit_context) | |
723 | context->loginuid = current->audit_context->loginuid; | |
724 | ||
725 | tsk->audit_context = context; | |
726 | set_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT); | |
727 | return 0; | |
728 | } | |
729 | ||
730 | static inline void audit_free_context(struct audit_context *context) | |
731 | { | |
732 | struct audit_context *previous; | |
733 | int count = 0; | |
734 | ||
735 | do { | |
736 | previous = context->previous; | |
737 | if (previous || (count && count < 10)) { | |
738 | ++count; | |
739 | printk(KERN_ERR "audit(:%d): major=%d name_count=%d:" | |
740 | " freeing multiple contexts (%d)\n", | |
741 | context->serial, context->major, | |
742 | context->name_count, count); | |
743 | } | |
744 | audit_free_names(context); | |
745 | audit_free_aux(context); | |
746 | kfree(context); | |
747 | context = previous; | |
748 | } while (context); | |
749 | if (count >= 10) | |
750 | printk(KERN_ERR "audit: freed %d contexts\n", count); | |
751 | } | |
752 | ||
219f0817 SS |
753 | static void audit_log_task_info(struct audit_buffer *ab) |
754 | { | |
755 | char name[sizeof(current->comm)]; | |
756 | struct mm_struct *mm = current->mm; | |
757 | struct vm_area_struct *vma; | |
758 | ||
759 | get_task_comm(name, current); | |
99e45eea DW |
760 | audit_log_format(ab, " comm="); |
761 | audit_log_untrustedstring(ab, name); | |
219f0817 SS |
762 | |
763 | if (!mm) | |
764 | return; | |
765 | ||
766 | down_read(&mm->mmap_sem); | |
767 | vma = mm->mmap; | |
768 | while (vma) { | |
769 | if ((vma->vm_flags & VM_EXECUTABLE) && | |
770 | vma->vm_file) { | |
771 | audit_log_d_path(ab, "exe=", | |
772 | vma->vm_file->f_dentry, | |
773 | vma->vm_file->f_vfsmnt); | |
774 | break; | |
775 | } | |
776 | vma = vma->vm_next; | |
777 | } | |
778 | up_read(&mm->mmap_sem); | |
779 | } | |
780 | ||
1da177e4 LT |
781 | static void audit_log_exit(struct audit_context *context) |
782 | { | |
783 | int i; | |
784 | struct audit_buffer *ab; | |
7551ced3 | 785 | struct audit_aux_data *aux; |
1da177e4 | 786 | |
9ad9ad38 | 787 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_SYSCALL); |
1da177e4 LT |
788 | if (!ab) |
789 | return; /* audit_panic has been called */ | |
bccf6ae0 DW |
790 | audit_log_format(ab, "arch=%x syscall=%d", |
791 | context->arch, context->major); | |
1da177e4 LT |
792 | if (context->personality != PER_LINUX) |
793 | audit_log_format(ab, " per=%lx", context->personality); | |
794 | if (context->return_valid) | |
2fd6f58b | 795 | audit_log_format(ab, " success=%s exit=%ld", |
796 | (context->return_valid==AUDITSC_SUCCESS)?"yes":"no", | |
797 | context->return_code); | |
1da177e4 LT |
798 | audit_log_format(ab, |
799 | " a0=%lx a1=%lx a2=%lx a3=%lx items=%d" | |
326e9c8b SG |
800 | " pid=%d auid=%u uid=%u gid=%u" |
801 | " euid=%u suid=%u fsuid=%u" | |
802 | " egid=%u sgid=%u fsgid=%u", | |
1da177e4 LT |
803 | context->argv[0], |
804 | context->argv[1], | |
805 | context->argv[2], | |
806 | context->argv[3], | |
807 | context->name_count, | |
808 | context->pid, | |
809 | context->loginuid, | |
810 | context->uid, | |
811 | context->gid, | |
812 | context->euid, context->suid, context->fsuid, | |
813 | context->egid, context->sgid, context->fsgid); | |
219f0817 | 814 | audit_log_task_info(ab); |
1da177e4 | 815 | audit_log_end(ab); |
1da177e4 | 816 | |
7551ced3 | 817 | for (aux = context->aux; aux; aux = aux->next) { |
c0404993 | 818 | |
9ad9ad38 | 819 | ab = audit_log_start(context, GFP_KERNEL, aux->type); |
1da177e4 LT |
820 | if (!ab) |
821 | continue; /* audit_panic has been called */ | |
822 | ||
1da177e4 | 823 | switch (aux->type) { |
c0404993 | 824 | case AUDIT_IPC: { |
1da177e4 LT |
825 | struct audit_aux_data_ipcctl *axi = (void *)aux; |
826 | audit_log_format(ab, | |
326e9c8b | 827 | " qbytes=%lx iuid=%u igid=%u mode=%x", |
1da177e4 | 828 | axi->qbytes, axi->uid, axi->gid, axi->mode); |
3ec3b2fb DW |
829 | break; } |
830 | ||
831 | case AUDIT_SOCKETCALL: { | |
832 | int i; | |
833 | struct audit_aux_data_socketcall *axs = (void *)aux; | |
834 | audit_log_format(ab, "nargs=%d", axs->nargs); | |
835 | for (i=0; i<axs->nargs; i++) | |
836 | audit_log_format(ab, " a%d=%lx", i, axs->args[i]); | |
837 | break; } | |
838 | ||
839 | case AUDIT_SOCKADDR: { | |
840 | struct audit_aux_data_sockaddr *axs = (void *)aux; | |
841 | ||
842 | audit_log_format(ab, "saddr="); | |
843 | audit_log_hex(ab, axs->a, axs->len); | |
844 | break; } | |
01116105 SS |
845 | |
846 | case AUDIT_AVC_PATH: { | |
847 | struct audit_aux_data_path *axi = (void *)aux; | |
848 | audit_log_d_path(ab, "path=", axi->dentry, axi->mnt); | |
01116105 SS |
849 | break; } |
850 | ||
1da177e4 LT |
851 | } |
852 | audit_log_end(ab); | |
1da177e4 LT |
853 | } |
854 | ||
8f37d47c | 855 | if (context->pwd && context->pwdmnt) { |
9ad9ad38 | 856 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD); |
8f37d47c DW |
857 | if (ab) { |
858 | audit_log_d_path(ab, "cwd=", context->pwd, context->pwdmnt); | |
859 | audit_log_end(ab); | |
860 | } | |
861 | } | |
1da177e4 | 862 | for (i = 0; i < context->name_count; i++) { |
9ad9ad38 | 863 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_PATH); |
1da177e4 LT |
864 | if (!ab) |
865 | continue; /* audit_panic has been called */ | |
8f37d47c | 866 | |
1da177e4 | 867 | audit_log_format(ab, "item=%d", i); |
83c7d091 | 868 | if (context->names[i].name) { |
869 | audit_log_format(ab, " name="); | |
870 | audit_log_untrustedstring(ab, context->names[i].name); | |
871 | } | |
ae7b961b DW |
872 | audit_log_format(ab, " flags=%x\n", context->names[i].flags); |
873 | ||
1da177e4 LT |
874 | if (context->names[i].ino != (unsigned long)-1) |
875 | audit_log_format(ab, " inode=%lu dev=%02x:%02x mode=%#o" | |
326e9c8b | 876 | " ouid=%u ogid=%u rdev=%02x:%02x", |
1da177e4 LT |
877 | context->names[i].ino, |
878 | MAJOR(context->names[i].dev), | |
879 | MINOR(context->names[i].dev), | |
880 | context->names[i].mode, | |
881 | context->names[i].uid, | |
882 | context->names[i].gid, | |
883 | MAJOR(context->names[i].rdev), | |
884 | MINOR(context->names[i].rdev)); | |
885 | audit_log_end(ab); | |
886 | } | |
887 | } | |
888 | ||
889 | /* Free a per-task audit context. Called from copy_process and | |
890 | * __put_task_struct. */ | |
891 | void audit_free(struct task_struct *tsk) | |
892 | { | |
893 | struct audit_context *context; | |
894 | ||
895 | task_lock(tsk); | |
896 | context = audit_get_context(tsk, 0, 0); | |
897 | task_unlock(tsk); | |
898 | ||
899 | if (likely(!context)) | |
900 | return; | |
901 | ||
902 | /* Check for system calls that do not go through the exit | |
903 | * function (e.g., exit_group), then free context block. */ | |
f7056d64 | 904 | if (context->in_syscall && context->auditable) |
1da177e4 LT |
905 | audit_log_exit(context); |
906 | ||
907 | audit_free_context(context); | |
908 | } | |
909 | ||
1da177e4 LT |
910 | /* Fill in audit context at syscall entry. This only happens if the |
911 | * audit context was created when the task was created and the state or | |
912 | * filters demand the audit context be built. If the state from the | |
913 | * per-task filter or from the per-syscall filter is AUDIT_RECORD_CONTEXT, | |
914 | * then the record will be written at syscall exit time (otherwise, it | |
915 | * will only be written if another part of the kernel requests that it | |
916 | * be written). */ | |
2fd6f58b | 917 | void audit_syscall_entry(struct task_struct *tsk, int arch, int major, |
1da177e4 LT |
918 | unsigned long a1, unsigned long a2, |
919 | unsigned long a3, unsigned long a4) | |
920 | { | |
921 | struct audit_context *context = tsk->audit_context; | |
922 | enum audit_state state; | |
923 | ||
924 | BUG_ON(!context); | |
925 | ||
926 | /* This happens only on certain architectures that make system | |
927 | * calls in kernel_thread via the entry.S interface, instead of | |
928 | * with direct calls. (If you are porting to a new | |
929 | * architecture, hitting this condition can indicate that you | |
930 | * got the _exit/_leave calls backward in entry.S.) | |
931 | * | |
932 | * i386 no | |
933 | * x86_64 no | |
934 | * ppc64 yes (see arch/ppc64/kernel/misc.S) | |
935 | * | |
936 | * This also happens with vm86 emulation in a non-nested manner | |
937 | * (entries without exits), so this case must be caught. | |
938 | */ | |
939 | if (context->in_syscall) { | |
940 | struct audit_context *newctx; | |
941 | ||
942 | #if defined(__NR_vm86) && defined(__NR_vm86old) | |
943 | /* vm86 mode should only be entered once */ | |
944 | if (major == __NR_vm86 || major == __NR_vm86old) | |
945 | return; | |
946 | #endif | |
947 | #if AUDIT_DEBUG | |
948 | printk(KERN_ERR | |
949 | "audit(:%d) pid=%d in syscall=%d;" | |
950 | " entering syscall=%d\n", | |
951 | context->serial, tsk->pid, context->major, major); | |
952 | #endif | |
953 | newctx = audit_alloc_context(context->state); | |
954 | if (newctx) { | |
955 | newctx->previous = context; | |
956 | context = newctx; | |
957 | tsk->audit_context = newctx; | |
958 | } else { | |
959 | /* If we can't alloc a new context, the best we | |
960 | * can do is to leak memory (any pending putname | |
961 | * will be lost). The only other alternative is | |
962 | * to abandon auditing. */ | |
963 | audit_zero_context(context, context->state); | |
964 | } | |
965 | } | |
966 | BUG_ON(context->in_syscall || context->name_count); | |
967 | ||
968 | if (!audit_enabled) | |
969 | return; | |
970 | ||
2fd6f58b | 971 | context->arch = arch; |
1da177e4 LT |
972 | context->major = major; |
973 | context->argv[0] = a1; | |
974 | context->argv[1] = a2; | |
975 | context->argv[2] = a3; | |
976 | context->argv[3] = a4; | |
977 | ||
978 | state = context->state; | |
979 | if (state == AUDIT_SETUP_CONTEXT || state == AUDIT_BUILD_CONTEXT) | |
0f45aa18 | 980 | state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_ENTRY]); |
1da177e4 LT |
981 | if (likely(state == AUDIT_DISABLED)) |
982 | return; | |
983 | ||
984 | context->serial = audit_serial(); | |
985 | context->ctime = CURRENT_TIME; | |
986 | context->in_syscall = 1; | |
987 | context->auditable = !!(state == AUDIT_RECORD_CONTEXT); | |
988 | } | |
989 | ||
990 | /* Tear down after system call. If the audit context has been marked as | |
991 | * auditable (either because of the AUDIT_RECORD_CONTEXT state from | |
992 | * filtering, or because some other part of the kernel write an audit | |
993 | * message), then write out the syscall information. In call cases, | |
994 | * free the names stored from getname(). */ | |
2fd6f58b | 995 | void audit_syscall_exit(struct task_struct *tsk, int valid, long return_code) |
1da177e4 LT |
996 | { |
997 | struct audit_context *context; | |
998 | ||
999 | get_task_struct(tsk); | |
1000 | task_lock(tsk); | |
2fd6f58b | 1001 | context = audit_get_context(tsk, valid, return_code); |
1da177e4 LT |
1002 | task_unlock(tsk); |
1003 | ||
1004 | /* Not having a context here is ok, since the parent may have | |
1005 | * called __put_task_struct. */ | |
1006 | if (likely(!context)) | |
1007 | return; | |
1008 | ||
f7056d64 | 1009 | if (context->in_syscall && context->auditable) |
1da177e4 LT |
1010 | audit_log_exit(context); |
1011 | ||
1012 | context->in_syscall = 0; | |
1013 | context->auditable = 0; | |
2fd6f58b | 1014 | |
1da177e4 LT |
1015 | if (context->previous) { |
1016 | struct audit_context *new_context = context->previous; | |
1017 | context->previous = NULL; | |
1018 | audit_free_context(context); | |
1019 | tsk->audit_context = new_context; | |
1020 | } else { | |
1021 | audit_free_names(context); | |
1022 | audit_free_aux(context); | |
1023 | audit_zero_context(context, context->state); | |
1024 | tsk->audit_context = context; | |
1025 | } | |
1026 | put_task_struct(tsk); | |
1027 | } | |
1028 | ||
1029 | /* Add a name to the list. Called from fs/namei.c:getname(). */ | |
1030 | void audit_getname(const char *name) | |
1031 | { | |
1032 | struct audit_context *context = current->audit_context; | |
1033 | ||
1034 | if (!context || IS_ERR(name) || !name) | |
1035 | return; | |
1036 | ||
1037 | if (!context->in_syscall) { | |
1038 | #if AUDIT_DEBUG == 2 | |
1039 | printk(KERN_ERR "%s:%d(:%d): ignoring getname(%p)\n", | |
1040 | __FILE__, __LINE__, context->serial, name); | |
1041 | dump_stack(); | |
1042 | #endif | |
1043 | return; | |
1044 | } | |
1045 | BUG_ON(context->name_count >= AUDIT_NAMES); | |
1046 | context->names[context->name_count].name = name; | |
1047 | context->names[context->name_count].ino = (unsigned long)-1; | |
1048 | ++context->name_count; | |
8f37d47c DW |
1049 | if (!context->pwd) { |
1050 | read_lock(¤t->fs->lock); | |
1051 | context->pwd = dget(current->fs->pwd); | |
1052 | context->pwdmnt = mntget(current->fs->pwdmnt); | |
1053 | read_unlock(¤t->fs->lock); | |
1054 | } | |
1055 | ||
1da177e4 LT |
1056 | } |
1057 | ||
1058 | /* Intercept a putname request. Called from | |
1059 | * include/linux/fs.h:putname(). If we have stored the name from | |
1060 | * getname in the audit context, then we delay the putname until syscall | |
1061 | * exit. */ | |
1062 | void audit_putname(const char *name) | |
1063 | { | |
1064 | struct audit_context *context = current->audit_context; | |
1065 | ||
1066 | BUG_ON(!context); | |
1067 | if (!context->in_syscall) { | |
1068 | #if AUDIT_DEBUG == 2 | |
1069 | printk(KERN_ERR "%s:%d(:%d): __putname(%p)\n", | |
1070 | __FILE__, __LINE__, context->serial, name); | |
1071 | if (context->name_count) { | |
1072 | int i; | |
1073 | for (i = 0; i < context->name_count; i++) | |
1074 | printk(KERN_ERR "name[%d] = %p = %s\n", i, | |
1075 | context->names[i].name, | |
1076 | context->names[i].name); | |
1077 | } | |
1078 | #endif | |
1079 | __putname(name); | |
1080 | } | |
1081 | #if AUDIT_DEBUG | |
1082 | else { | |
1083 | ++context->put_count; | |
1084 | if (context->put_count > context->name_count) { | |
1085 | printk(KERN_ERR "%s:%d(:%d): major=%d" | |
1086 | " in_syscall=%d putname(%p) name_count=%d" | |
1087 | " put_count=%d\n", | |
1088 | __FILE__, __LINE__, | |
1089 | context->serial, context->major, | |
1090 | context->in_syscall, name, context->name_count, | |
1091 | context->put_count); | |
1092 | dump_stack(); | |
1093 | } | |
1094 | } | |
1095 | #endif | |
1096 | } | |
1097 | ||
1098 | /* Store the inode and device from a lookup. Called from | |
1099 | * fs/namei.c:path_lookup(). */ | |
ae7b961b | 1100 | void audit_inode(const char *name, const struct inode *inode, unsigned flags) |
1da177e4 LT |
1101 | { |
1102 | int idx; | |
1103 | struct audit_context *context = current->audit_context; | |
1104 | ||
1105 | if (!context->in_syscall) | |
1106 | return; | |
1107 | if (context->name_count | |
1108 | && context->names[context->name_count-1].name | |
1109 | && context->names[context->name_count-1].name == name) | |
1110 | idx = context->name_count - 1; | |
1111 | else if (context->name_count > 1 | |
1112 | && context->names[context->name_count-2].name | |
1113 | && context->names[context->name_count-2].name == name) | |
1114 | idx = context->name_count - 2; | |
1115 | else { | |
1116 | /* FIXME: how much do we care about inodes that have no | |
1117 | * associated name? */ | |
1118 | if (context->name_count >= AUDIT_NAMES - AUDIT_NAMES_RESERVED) | |
1119 | return; | |
1120 | idx = context->name_count++; | |
1121 | context->names[idx].name = NULL; | |
1122 | #if AUDIT_DEBUG | |
1123 | ++context->ino_count; | |
1124 | #endif | |
1125 | } | |
ae7b961b DW |
1126 | context->names[idx].flags = flags; |
1127 | context->names[idx].ino = inode->i_ino; | |
1128 | context->names[idx].dev = inode->i_sb->s_dev; | |
1129 | context->names[idx].mode = inode->i_mode; | |
1130 | context->names[idx].uid = inode->i_uid; | |
1131 | context->names[idx].gid = inode->i_gid; | |
1132 | context->names[idx].rdev = inode->i_rdev; | |
1da177e4 LT |
1133 | } |
1134 | ||
bfb4496e DW |
1135 | void auditsc_get_stamp(struct audit_context *ctx, |
1136 | struct timespec *t, unsigned int *serial) | |
1da177e4 | 1137 | { |
bfb4496e DW |
1138 | t->tv_sec = ctx->ctime.tv_sec; |
1139 | t->tv_nsec = ctx->ctime.tv_nsec; | |
1140 | *serial = ctx->serial; | |
1141 | ctx->auditable = 1; | |
1da177e4 LT |
1142 | } |
1143 | ||
456be6cd | 1144 | int audit_set_loginuid(struct task_struct *task, uid_t loginuid) |
1da177e4 | 1145 | { |
456be6cd | 1146 | if (task->audit_context) { |
c0404993 SG |
1147 | struct audit_buffer *ab; |
1148 | ||
9ad9ad38 | 1149 | ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_LOGIN); |
c0404993 SG |
1150 | if (ab) { |
1151 | audit_log_format(ab, "login pid=%d uid=%u " | |
326e9c8b | 1152 | "old auid=%u new auid=%u", |
c0404993 SG |
1153 | task->pid, task->uid, |
1154 | task->audit_context->loginuid, loginuid); | |
1155 | audit_log_end(ab); | |
1156 | } | |
456be6cd | 1157 | task->audit_context->loginuid = loginuid; |
1da177e4 LT |
1158 | } |
1159 | return 0; | |
1160 | } | |
1161 | ||
1162 | uid_t audit_get_loginuid(struct audit_context *ctx) | |
1163 | { | |
1164 | return ctx ? ctx->loginuid : -1; | |
1165 | } | |
1166 | ||
1167 | int audit_ipc_perms(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode) | |
1168 | { | |
1169 | struct audit_aux_data_ipcctl *ax; | |
1170 | struct audit_context *context = current->audit_context; | |
1171 | ||
1172 | if (likely(!context)) | |
1173 | return 0; | |
1174 | ||
1175 | ax = kmalloc(sizeof(*ax), GFP_KERNEL); | |
1176 | if (!ax) | |
1177 | return -ENOMEM; | |
1178 | ||
1179 | ax->qbytes = qbytes; | |
1180 | ax->uid = uid; | |
1181 | ax->gid = gid; | |
1182 | ax->mode = mode; | |
1183 | ||
c0404993 | 1184 | ax->d.type = AUDIT_IPC; |
1da177e4 LT |
1185 | ax->d.next = context->aux; |
1186 | context->aux = (void *)ax; | |
1187 | return 0; | |
1188 | } | |
c2f0c7c3 | 1189 | |
3ec3b2fb DW |
1190 | int audit_socketcall(int nargs, unsigned long *args) |
1191 | { | |
1192 | struct audit_aux_data_socketcall *ax; | |
1193 | struct audit_context *context = current->audit_context; | |
1194 | ||
1195 | if (likely(!context)) | |
1196 | return 0; | |
1197 | ||
1198 | ax = kmalloc(sizeof(*ax) + nargs * sizeof(unsigned long), GFP_KERNEL); | |
1199 | if (!ax) | |
1200 | return -ENOMEM; | |
1201 | ||
1202 | ax->nargs = nargs; | |
1203 | memcpy(ax->args, args, nargs * sizeof(unsigned long)); | |
1204 | ||
1205 | ax->d.type = AUDIT_SOCKETCALL; | |
1206 | ax->d.next = context->aux; | |
1207 | context->aux = (void *)ax; | |
1208 | return 0; | |
1209 | } | |
1210 | ||
1211 | int audit_sockaddr(int len, void *a) | |
1212 | { | |
1213 | struct audit_aux_data_sockaddr *ax; | |
1214 | struct audit_context *context = current->audit_context; | |
1215 | ||
1216 | if (likely(!context)) | |
1217 | return 0; | |
1218 | ||
1219 | ax = kmalloc(sizeof(*ax) + len, GFP_KERNEL); | |
1220 | if (!ax) | |
1221 | return -ENOMEM; | |
1222 | ||
1223 | ax->len = len; | |
1224 | memcpy(ax->a, a, len); | |
1225 | ||
1226 | ax->d.type = AUDIT_SOCKADDR; | |
1227 | ax->d.next = context->aux; | |
1228 | context->aux = (void *)ax; | |
1229 | return 0; | |
1230 | } | |
1231 | ||
01116105 SS |
1232 | int audit_avc_path(struct dentry *dentry, struct vfsmount *mnt) |
1233 | { | |
1234 | struct audit_aux_data_path *ax; | |
1235 | struct audit_context *context = current->audit_context; | |
1236 | ||
1237 | if (likely(!context)) | |
1238 | return 0; | |
1239 | ||
1240 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1241 | if (!ax) | |
1242 | return -ENOMEM; | |
1243 | ||
1244 | ax->dentry = dget(dentry); | |
1245 | ax->mnt = mntget(mnt); | |
1246 | ||
1247 | ax->d.type = AUDIT_AVC_PATH; | |
1248 | ax->d.next = context->aux; | |
1249 | context->aux = (void *)ax; | |
1250 | return 0; | |
1251 | } | |
1252 | ||
c2f0c7c3 SG |
1253 | void audit_signal_info(int sig, struct task_struct *t) |
1254 | { | |
1255 | extern pid_t audit_sig_pid; | |
1256 | extern uid_t audit_sig_uid; | |
c2f0c7c3 | 1257 | |
582edda5 | 1258 | if (unlikely(audit_pid && t->tgid == audit_pid)) { |
c2f0c7c3 SG |
1259 | if (sig == SIGTERM || sig == SIGHUP) { |
1260 | struct audit_context *ctx = current->audit_context; | |
1261 | audit_sig_pid = current->pid; | |
1262 | if (ctx) | |
1263 | audit_sig_uid = ctx->loginuid; | |
1264 | else | |
1265 | audit_sig_uid = current->uid; | |
1266 | } | |
1267 | } | |
1268 | } | |
1269 |