Commit | Line | Data |
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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. | |
73241ccc | 5 | * Copyright 2005 Hewlett-Packard Development Company, L.P. |
20ca73bc | 6 | * Copyright (C) 2005, 2006 IBM Corporation |
1da177e4 LT |
7 | * All Rights Reserved. |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
22 | * | |
23 | * Written by Rickard E. (Rik) Faith <faith@redhat.com> | |
24 | * | |
25 | * Many of the ideas implemented here are from Stephen C. Tweedie, | |
26 | * especially the idea of avoiding a copy by using getname. | |
27 | * | |
28 | * The method for actual interception of syscall entry and exit (not in | |
29 | * this file -- see entry.S) is based on a GPL'd patch written by | |
30 | * okir@suse.de and Copyright 2003 SuSE Linux AG. | |
31 | * | |
20ca73bc GW |
32 | * POSIX message queue support added by George Wilson <ltcgcw@us.ibm.com>, |
33 | * 2006. | |
34 | * | |
b63862f4 DK |
35 | * The support of additional filter rules compares (>, <, >=, <=) was |
36 | * added by Dustin Kirkland <dustin.kirkland@us.ibm.com>, 2005. | |
37 | * | |
73241ccc AG |
38 | * Modified by Amy Griffis <amy.griffis@hp.com> to collect additional |
39 | * filesystem information. | |
8c8570fb DK |
40 | * |
41 | * Subject and object context labeling support added by <danjones@us.ibm.com> | |
42 | * and <dustin.kirkland@us.ibm.com> for LSPP certification compliance. | |
1da177e4 LT |
43 | */ |
44 | ||
45 | #include <linux/init.h> | |
1da177e4 | 46 | #include <asm/types.h> |
715b49ef | 47 | #include <asm/atomic.h> |
73241ccc AG |
48 | #include <asm/types.h> |
49 | #include <linux/fs.h> | |
50 | #include <linux/namei.h> | |
1da177e4 LT |
51 | #include <linux/mm.h> |
52 | #include <linux/module.h> | |
01116105 | 53 | #include <linux/mount.h> |
3ec3b2fb | 54 | #include <linux/socket.h> |
20ca73bc | 55 | #include <linux/mqueue.h> |
1da177e4 LT |
56 | #include <linux/audit.h> |
57 | #include <linux/personality.h> | |
58 | #include <linux/time.h> | |
5bb289b5 | 59 | #include <linux/netlink.h> |
f5561964 | 60 | #include <linux/compiler.h> |
1da177e4 | 61 | #include <asm/unistd.h> |
8c8570fb | 62 | #include <linux/security.h> |
fe7752ba | 63 | #include <linux/list.h> |
a6c043a8 | 64 | #include <linux/tty.h> |
3dc7e315 | 65 | #include <linux/selinux.h> |
473ae30b | 66 | #include <linux/binfmts.h> |
f46038ff | 67 | #include <linux/syscalls.h> |
1da177e4 | 68 | |
fe7752ba | 69 | #include "audit.h" |
1da177e4 | 70 | |
fe7752ba | 71 | extern struct list_head audit_filter_list[]; |
1da177e4 LT |
72 | |
73 | /* No syscall auditing will take place unless audit_enabled != 0. */ | |
74 | extern int audit_enabled; | |
75 | ||
76 | /* AUDIT_NAMES is the number of slots we reserve in the audit_context | |
77 | * for saving names from getname(). */ | |
78 | #define AUDIT_NAMES 20 | |
79 | ||
80 | /* AUDIT_NAMES_RESERVED is the number of slots we reserve in the | |
81 | * audit_context from being used for nameless inodes from | |
82 | * path_lookup. */ | |
83 | #define AUDIT_NAMES_RESERVED 7 | |
84 | ||
9c937dcc AG |
85 | /* Indicates that audit should log the full pathname. */ |
86 | #define AUDIT_NAME_FULL -1 | |
87 | ||
471a5c7c AV |
88 | /* number of audit rules */ |
89 | int audit_n_rules; | |
90 | ||
1da177e4 LT |
91 | /* When fs/namei.c:getname() is called, we store the pointer in name and |
92 | * we don't let putname() free it (instead we free all of the saved | |
93 | * pointers at syscall exit time). | |
94 | * | |
95 | * Further, in fs/namei.c:path_lookup() we store the inode and device. */ | |
96 | struct audit_names { | |
97 | const char *name; | |
9c937dcc AG |
98 | int name_len; /* number of name's characters to log */ |
99 | unsigned name_put; /* call __putname() for this name */ | |
1da177e4 LT |
100 | unsigned long ino; |
101 | dev_t dev; | |
102 | umode_t mode; | |
103 | uid_t uid; | |
104 | gid_t gid; | |
105 | dev_t rdev; | |
1b50eed9 | 106 | u32 osid; |
1da177e4 LT |
107 | }; |
108 | ||
109 | struct audit_aux_data { | |
110 | struct audit_aux_data *next; | |
111 | int type; | |
112 | }; | |
113 | ||
114 | #define AUDIT_AUX_IPCPERM 0 | |
115 | ||
20ca73bc GW |
116 | struct audit_aux_data_mq_open { |
117 | struct audit_aux_data d; | |
118 | int oflag; | |
119 | mode_t mode; | |
120 | struct mq_attr attr; | |
121 | }; | |
122 | ||
123 | struct audit_aux_data_mq_sendrecv { | |
124 | struct audit_aux_data d; | |
125 | mqd_t mqdes; | |
126 | size_t msg_len; | |
127 | unsigned int msg_prio; | |
128 | struct timespec abs_timeout; | |
129 | }; | |
130 | ||
131 | struct audit_aux_data_mq_notify { | |
132 | struct audit_aux_data d; | |
133 | mqd_t mqdes; | |
134 | struct sigevent notification; | |
135 | }; | |
136 | ||
137 | struct audit_aux_data_mq_getsetattr { | |
138 | struct audit_aux_data d; | |
139 | mqd_t mqdes; | |
140 | struct mq_attr mqstat; | |
141 | }; | |
142 | ||
1da177e4 LT |
143 | struct audit_aux_data_ipcctl { |
144 | struct audit_aux_data d; | |
145 | struct ipc_perm p; | |
146 | unsigned long qbytes; | |
147 | uid_t uid; | |
148 | gid_t gid; | |
149 | mode_t mode; | |
9c7aa6aa | 150 | u32 osid; |
1da177e4 LT |
151 | }; |
152 | ||
473ae30b AV |
153 | struct audit_aux_data_execve { |
154 | struct audit_aux_data d; | |
155 | int argc; | |
156 | int envc; | |
157 | char mem[0]; | |
158 | }; | |
159 | ||
3ec3b2fb DW |
160 | struct audit_aux_data_socketcall { |
161 | struct audit_aux_data d; | |
162 | int nargs; | |
163 | unsigned long args[0]; | |
164 | }; | |
165 | ||
166 | struct audit_aux_data_sockaddr { | |
167 | struct audit_aux_data d; | |
168 | int len; | |
169 | char a[0]; | |
170 | }; | |
171 | ||
01116105 SS |
172 | struct audit_aux_data_path { |
173 | struct audit_aux_data d; | |
174 | struct dentry *dentry; | |
175 | struct vfsmount *mnt; | |
176 | }; | |
1da177e4 LT |
177 | |
178 | /* The per-task audit context. */ | |
179 | struct audit_context { | |
180 | int in_syscall; /* 1 if task is in a syscall */ | |
181 | enum audit_state state; | |
182 | unsigned int serial; /* serial number for record */ | |
183 | struct timespec ctime; /* time of syscall entry */ | |
184 | uid_t loginuid; /* login uid (identity) */ | |
185 | int major; /* syscall number */ | |
186 | unsigned long argv[4]; /* syscall arguments */ | |
187 | int return_valid; /* return code is valid */ | |
2fd6f58b | 188 | long return_code;/* syscall return code */ |
1da177e4 LT |
189 | int auditable; /* 1 if record should be written */ |
190 | int name_count; | |
191 | struct audit_names names[AUDIT_NAMES]; | |
5adc8a6a | 192 | char * filterkey; /* key for rule that triggered record */ |
8f37d47c DW |
193 | struct dentry * pwd; |
194 | struct vfsmount * pwdmnt; | |
1da177e4 LT |
195 | struct audit_context *previous; /* For nested syscalls */ |
196 | struct audit_aux_data *aux; | |
197 | ||
198 | /* Save things to print about task_struct */ | |
f46038ff | 199 | pid_t pid, ppid; |
1da177e4 LT |
200 | uid_t uid, euid, suid, fsuid; |
201 | gid_t gid, egid, sgid, fsgid; | |
202 | unsigned long personality; | |
2fd6f58b | 203 | int arch; |
1da177e4 LT |
204 | |
205 | #if AUDIT_DEBUG | |
206 | int put_count; | |
207 | int ino_count; | |
208 | #endif | |
209 | }; | |
210 | ||
f368c07d | 211 | /* Determine if any context name data matches a rule's watch data */ |
1da177e4 LT |
212 | /* Compare a task_struct with an audit_rule. Return 1 on match, 0 |
213 | * otherwise. */ | |
214 | static int audit_filter_rules(struct task_struct *tsk, | |
93315ed6 | 215 | struct audit_krule *rule, |
1da177e4 | 216 | struct audit_context *ctx, |
f368c07d | 217 | struct audit_names *name, |
1da177e4 LT |
218 | enum audit_state *state) |
219 | { | |
2ad312d2 | 220 | int i, j, need_sid = 1; |
3dc7e315 DG |
221 | u32 sid; |
222 | ||
1da177e4 | 223 | for (i = 0; i < rule->field_count; i++) { |
93315ed6 | 224 | struct audit_field *f = &rule->fields[i]; |
1da177e4 LT |
225 | int result = 0; |
226 | ||
93315ed6 | 227 | switch (f->type) { |
1da177e4 | 228 | case AUDIT_PID: |
93315ed6 | 229 | result = audit_comparator(tsk->pid, f->op, f->val); |
1da177e4 | 230 | break; |
3c66251e AV |
231 | case AUDIT_PPID: |
232 | if (ctx) | |
233 | result = audit_comparator(ctx->ppid, f->op, f->val); | |
234 | break; | |
1da177e4 | 235 | case AUDIT_UID: |
93315ed6 | 236 | result = audit_comparator(tsk->uid, f->op, f->val); |
1da177e4 LT |
237 | break; |
238 | case AUDIT_EUID: | |
93315ed6 | 239 | result = audit_comparator(tsk->euid, f->op, f->val); |
1da177e4 LT |
240 | break; |
241 | case AUDIT_SUID: | |
93315ed6 | 242 | result = audit_comparator(tsk->suid, f->op, f->val); |
1da177e4 LT |
243 | break; |
244 | case AUDIT_FSUID: | |
93315ed6 | 245 | result = audit_comparator(tsk->fsuid, f->op, f->val); |
1da177e4 LT |
246 | break; |
247 | case AUDIT_GID: | |
93315ed6 | 248 | result = audit_comparator(tsk->gid, f->op, f->val); |
1da177e4 LT |
249 | break; |
250 | case AUDIT_EGID: | |
93315ed6 | 251 | result = audit_comparator(tsk->egid, f->op, f->val); |
1da177e4 LT |
252 | break; |
253 | case AUDIT_SGID: | |
93315ed6 | 254 | result = audit_comparator(tsk->sgid, f->op, f->val); |
1da177e4 LT |
255 | break; |
256 | case AUDIT_FSGID: | |
93315ed6 | 257 | result = audit_comparator(tsk->fsgid, f->op, f->val); |
1da177e4 LT |
258 | break; |
259 | case AUDIT_PERS: | |
93315ed6 | 260 | result = audit_comparator(tsk->personality, f->op, f->val); |
1da177e4 | 261 | break; |
2fd6f58b | 262 | case AUDIT_ARCH: |
b63862f4 | 263 | if (ctx) |
93315ed6 | 264 | result = audit_comparator(ctx->arch, f->op, f->val); |
2fd6f58b | 265 | break; |
1da177e4 LT |
266 | |
267 | case AUDIT_EXIT: | |
268 | if (ctx && ctx->return_valid) | |
93315ed6 | 269 | result = audit_comparator(ctx->return_code, f->op, f->val); |
1da177e4 LT |
270 | break; |
271 | case AUDIT_SUCCESS: | |
b01f2cc1 | 272 | if (ctx && ctx->return_valid) { |
93315ed6 AG |
273 | if (f->val) |
274 | result = audit_comparator(ctx->return_valid, f->op, AUDITSC_SUCCESS); | |
b01f2cc1 | 275 | else |
93315ed6 | 276 | result = audit_comparator(ctx->return_valid, f->op, AUDITSC_FAILURE); |
b01f2cc1 | 277 | } |
1da177e4 LT |
278 | break; |
279 | case AUDIT_DEVMAJOR: | |
f368c07d AG |
280 | if (name) |
281 | result = audit_comparator(MAJOR(name->dev), | |
282 | f->op, f->val); | |
283 | else if (ctx) { | |
1da177e4 | 284 | for (j = 0; j < ctx->name_count; j++) { |
93315ed6 | 285 | if (audit_comparator(MAJOR(ctx->names[j].dev), f->op, f->val)) { |
1da177e4 LT |
286 | ++result; |
287 | break; | |
288 | } | |
289 | } | |
290 | } | |
291 | break; | |
292 | case AUDIT_DEVMINOR: | |
f368c07d AG |
293 | if (name) |
294 | result = audit_comparator(MINOR(name->dev), | |
295 | f->op, f->val); | |
296 | else if (ctx) { | |
1da177e4 | 297 | for (j = 0; j < ctx->name_count; j++) { |
93315ed6 | 298 | if (audit_comparator(MINOR(ctx->names[j].dev), f->op, f->val)) { |
1da177e4 LT |
299 | ++result; |
300 | break; | |
301 | } | |
302 | } | |
303 | } | |
304 | break; | |
305 | case AUDIT_INODE: | |
f368c07d | 306 | if (name) |
9c937dcc | 307 | result = (name->ino == f->val); |
f368c07d | 308 | else if (ctx) { |
1da177e4 | 309 | for (j = 0; j < ctx->name_count; j++) { |
9c937dcc | 310 | if (audit_comparator(ctx->names[j].ino, f->op, f->val)) { |
1da177e4 LT |
311 | ++result; |
312 | break; | |
313 | } | |
314 | } | |
315 | } | |
316 | break; | |
f368c07d AG |
317 | case AUDIT_WATCH: |
318 | if (name && rule->watch->ino != (unsigned long)-1) | |
319 | result = (name->dev == rule->watch->dev && | |
9c937dcc | 320 | name->ino == rule->watch->ino); |
f368c07d | 321 | break; |
1da177e4 LT |
322 | case AUDIT_LOGINUID: |
323 | result = 0; | |
324 | if (ctx) | |
93315ed6 | 325 | result = audit_comparator(ctx->loginuid, f->op, f->val); |
1da177e4 | 326 | break; |
3a6b9f85 DG |
327 | case AUDIT_SUBJ_USER: |
328 | case AUDIT_SUBJ_ROLE: | |
329 | case AUDIT_SUBJ_TYPE: | |
330 | case AUDIT_SUBJ_SEN: | |
331 | case AUDIT_SUBJ_CLR: | |
3dc7e315 DG |
332 | /* NOTE: this may return negative values indicating |
333 | a temporary error. We simply treat this as a | |
334 | match for now to avoid losing information that | |
335 | may be wanted. An error message will also be | |
336 | logged upon error */ | |
2ad312d2 SG |
337 | if (f->se_rule) { |
338 | if (need_sid) { | |
339 | selinux_task_ctxid(tsk, &sid); | |
340 | need_sid = 0; | |
341 | } | |
3dc7e315 DG |
342 | result = selinux_audit_rule_match(sid, f->type, |
343 | f->op, | |
344 | f->se_rule, | |
345 | ctx); | |
2ad312d2 | 346 | } |
3dc7e315 | 347 | break; |
6e5a2d1d DG |
348 | case AUDIT_OBJ_USER: |
349 | case AUDIT_OBJ_ROLE: | |
350 | case AUDIT_OBJ_TYPE: | |
351 | case AUDIT_OBJ_LEV_LOW: | |
352 | case AUDIT_OBJ_LEV_HIGH: | |
353 | /* The above note for AUDIT_SUBJ_USER...AUDIT_SUBJ_CLR | |
354 | also applies here */ | |
355 | if (f->se_rule) { | |
356 | /* Find files that match */ | |
357 | if (name) { | |
358 | result = selinux_audit_rule_match( | |
359 | name->osid, f->type, f->op, | |
360 | f->se_rule, ctx); | |
361 | } else if (ctx) { | |
362 | for (j = 0; j < ctx->name_count; j++) { | |
363 | if (selinux_audit_rule_match( | |
364 | ctx->names[j].osid, | |
365 | f->type, f->op, | |
366 | f->se_rule, ctx)) { | |
367 | ++result; | |
368 | break; | |
369 | } | |
370 | } | |
371 | } | |
372 | /* Find ipc objects that match */ | |
373 | if (ctx) { | |
374 | struct audit_aux_data *aux; | |
375 | for (aux = ctx->aux; aux; | |
376 | aux = aux->next) { | |
377 | if (aux->type == AUDIT_IPC) { | |
378 | struct audit_aux_data_ipcctl *axi = (void *)aux; | |
379 | if (selinux_audit_rule_match(axi->osid, f->type, f->op, f->se_rule, ctx)) { | |
380 | ++result; | |
381 | break; | |
382 | } | |
383 | } | |
384 | } | |
385 | } | |
386 | } | |
387 | break; | |
1da177e4 LT |
388 | case AUDIT_ARG0: |
389 | case AUDIT_ARG1: | |
390 | case AUDIT_ARG2: | |
391 | case AUDIT_ARG3: | |
392 | if (ctx) | |
93315ed6 | 393 | result = audit_comparator(ctx->argv[f->type-AUDIT_ARG0], f->op, f->val); |
1da177e4 | 394 | break; |
5adc8a6a AG |
395 | case AUDIT_FILTERKEY: |
396 | /* ignore this field for filtering */ | |
397 | result = 1; | |
398 | break; | |
1da177e4 LT |
399 | } |
400 | ||
1da177e4 LT |
401 | if (!result) |
402 | return 0; | |
403 | } | |
5adc8a6a AG |
404 | if (rule->filterkey) |
405 | ctx->filterkey = kstrdup(rule->filterkey, GFP_ATOMIC); | |
1da177e4 LT |
406 | switch (rule->action) { |
407 | case AUDIT_NEVER: *state = AUDIT_DISABLED; break; | |
1da177e4 LT |
408 | case AUDIT_ALWAYS: *state = AUDIT_RECORD_CONTEXT; break; |
409 | } | |
410 | return 1; | |
411 | } | |
412 | ||
413 | /* At process creation time, we can determine if system-call auditing is | |
414 | * completely disabled for this task. Since we only have the task | |
415 | * structure at this point, we can only check uid and gid. | |
416 | */ | |
417 | static enum audit_state audit_filter_task(struct task_struct *tsk) | |
418 | { | |
419 | struct audit_entry *e; | |
420 | enum audit_state state; | |
421 | ||
422 | rcu_read_lock(); | |
0f45aa18 | 423 | list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_TASK], list) { |
f368c07d | 424 | if (audit_filter_rules(tsk, &e->rule, NULL, NULL, &state)) { |
1da177e4 LT |
425 | rcu_read_unlock(); |
426 | return state; | |
427 | } | |
428 | } | |
429 | rcu_read_unlock(); | |
430 | return AUDIT_BUILD_CONTEXT; | |
431 | } | |
432 | ||
433 | /* At syscall entry and exit time, this filter is called if the | |
434 | * audit_state is not low enough that auditing cannot take place, but is | |
23f32d18 | 435 | * also not high enough that we already know we have to write an audit |
b0dd25a8 | 436 | * record (i.e., the state is AUDIT_SETUP_CONTEXT or AUDIT_BUILD_CONTEXT). |
1da177e4 LT |
437 | */ |
438 | static enum audit_state audit_filter_syscall(struct task_struct *tsk, | |
439 | struct audit_context *ctx, | |
440 | struct list_head *list) | |
441 | { | |
442 | struct audit_entry *e; | |
c3896495 | 443 | enum audit_state state; |
1da177e4 | 444 | |
351bb722 | 445 | if (audit_pid && tsk->tgid == audit_pid) |
f7056d64 DW |
446 | return AUDIT_DISABLED; |
447 | ||
1da177e4 | 448 | rcu_read_lock(); |
c3896495 | 449 | if (!list_empty(list)) { |
b63862f4 DK |
450 | int word = AUDIT_WORD(ctx->major); |
451 | int bit = AUDIT_BIT(ctx->major); | |
452 | ||
453 | list_for_each_entry_rcu(e, list, list) { | |
f368c07d AG |
454 | if ((e->rule.mask[word] & bit) == bit && |
455 | audit_filter_rules(tsk, &e->rule, ctx, NULL, | |
456 | &state)) { | |
457 | rcu_read_unlock(); | |
458 | return state; | |
459 | } | |
460 | } | |
461 | } | |
462 | rcu_read_unlock(); | |
463 | return AUDIT_BUILD_CONTEXT; | |
464 | } | |
465 | ||
466 | /* At syscall exit time, this filter is called if any audit_names[] have been | |
467 | * collected during syscall processing. We only check rules in sublists at hash | |
468 | * buckets applicable to the inode numbers in audit_names[]. | |
469 | * Regarding audit_state, same rules apply as for audit_filter_syscall(). | |
470 | */ | |
471 | enum audit_state audit_filter_inodes(struct task_struct *tsk, | |
472 | struct audit_context *ctx) | |
473 | { | |
474 | int i; | |
475 | struct audit_entry *e; | |
476 | enum audit_state state; | |
477 | ||
478 | if (audit_pid && tsk->tgid == audit_pid) | |
479 | return AUDIT_DISABLED; | |
480 | ||
481 | rcu_read_lock(); | |
482 | for (i = 0; i < ctx->name_count; i++) { | |
483 | int word = AUDIT_WORD(ctx->major); | |
484 | int bit = AUDIT_BIT(ctx->major); | |
485 | struct audit_names *n = &ctx->names[i]; | |
486 | int h = audit_hash_ino((u32)n->ino); | |
487 | struct list_head *list = &audit_inode_hash[h]; | |
488 | ||
489 | if (list_empty(list)) | |
490 | continue; | |
491 | ||
492 | list_for_each_entry_rcu(e, list, list) { | |
493 | if ((e->rule.mask[word] & bit) == bit && | |
494 | audit_filter_rules(tsk, &e->rule, ctx, n, &state)) { | |
b63862f4 DK |
495 | rcu_read_unlock(); |
496 | return state; | |
497 | } | |
0f45aa18 DW |
498 | } |
499 | } | |
500 | rcu_read_unlock(); | |
1da177e4 | 501 | return AUDIT_BUILD_CONTEXT; |
0f45aa18 DW |
502 | } |
503 | ||
f368c07d AG |
504 | void audit_set_auditable(struct audit_context *ctx) |
505 | { | |
506 | ctx->auditable = 1; | |
507 | } | |
508 | ||
1da177e4 LT |
509 | static inline struct audit_context *audit_get_context(struct task_struct *tsk, |
510 | int return_valid, | |
511 | int return_code) | |
512 | { | |
513 | struct audit_context *context = tsk->audit_context; | |
514 | ||
515 | if (likely(!context)) | |
516 | return NULL; | |
517 | context->return_valid = return_valid; | |
518 | context->return_code = return_code; | |
519 | ||
21af6c4f | 520 | if (context->in_syscall && !context->auditable) { |
1da177e4 | 521 | enum audit_state state; |
f368c07d | 522 | |
0f45aa18 | 523 | state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_EXIT]); |
f368c07d AG |
524 | if (state == AUDIT_RECORD_CONTEXT) { |
525 | context->auditable = 1; | |
526 | goto get_context; | |
527 | } | |
528 | ||
529 | state = audit_filter_inodes(tsk, context); | |
1da177e4 LT |
530 | if (state == AUDIT_RECORD_CONTEXT) |
531 | context->auditable = 1; | |
f368c07d | 532 | |
1da177e4 LT |
533 | } |
534 | ||
f368c07d | 535 | get_context: |
1da177e4 | 536 | context->pid = tsk->pid; |
f46038ff | 537 | context->ppid = sys_getppid(); /* sic. tsk == current in all cases */ |
1da177e4 LT |
538 | context->uid = tsk->uid; |
539 | context->gid = tsk->gid; | |
540 | context->euid = tsk->euid; | |
541 | context->suid = tsk->suid; | |
542 | context->fsuid = tsk->fsuid; | |
543 | context->egid = tsk->egid; | |
544 | context->sgid = tsk->sgid; | |
545 | context->fsgid = tsk->fsgid; | |
546 | context->personality = tsk->personality; | |
547 | tsk->audit_context = NULL; | |
548 | return context; | |
549 | } | |
550 | ||
551 | static inline void audit_free_names(struct audit_context *context) | |
552 | { | |
553 | int i; | |
554 | ||
555 | #if AUDIT_DEBUG == 2 | |
556 | if (context->auditable | |
557 | ||context->put_count + context->ino_count != context->name_count) { | |
73241ccc | 558 | printk(KERN_ERR "%s:%d(:%d): major=%d in_syscall=%d" |
1da177e4 LT |
559 | " name_count=%d put_count=%d" |
560 | " ino_count=%d [NOT freeing]\n", | |
73241ccc | 561 | __FILE__, __LINE__, |
1da177e4 LT |
562 | context->serial, context->major, context->in_syscall, |
563 | context->name_count, context->put_count, | |
564 | context->ino_count); | |
8c8570fb | 565 | for (i = 0; i < context->name_count; i++) { |
1da177e4 LT |
566 | printk(KERN_ERR "names[%d] = %p = %s\n", i, |
567 | context->names[i].name, | |
73241ccc | 568 | context->names[i].name ?: "(null)"); |
8c8570fb | 569 | } |
1da177e4 LT |
570 | dump_stack(); |
571 | return; | |
572 | } | |
573 | #endif | |
574 | #if AUDIT_DEBUG | |
575 | context->put_count = 0; | |
576 | context->ino_count = 0; | |
577 | #endif | |
578 | ||
8c8570fb | 579 | for (i = 0; i < context->name_count; i++) { |
9c937dcc | 580 | if (context->names[i].name && context->names[i].name_put) |
1da177e4 | 581 | __putname(context->names[i].name); |
8c8570fb | 582 | } |
1da177e4 | 583 | context->name_count = 0; |
8f37d47c DW |
584 | if (context->pwd) |
585 | dput(context->pwd); | |
586 | if (context->pwdmnt) | |
587 | mntput(context->pwdmnt); | |
588 | context->pwd = NULL; | |
589 | context->pwdmnt = NULL; | |
1da177e4 LT |
590 | } |
591 | ||
592 | static inline void audit_free_aux(struct audit_context *context) | |
593 | { | |
594 | struct audit_aux_data *aux; | |
595 | ||
596 | while ((aux = context->aux)) { | |
01116105 SS |
597 | if (aux->type == AUDIT_AVC_PATH) { |
598 | struct audit_aux_data_path *axi = (void *)aux; | |
599 | dput(axi->dentry); | |
600 | mntput(axi->mnt); | |
601 | } | |
8c8570fb | 602 | |
1da177e4 LT |
603 | context->aux = aux->next; |
604 | kfree(aux); | |
605 | } | |
606 | } | |
607 | ||
608 | static inline void audit_zero_context(struct audit_context *context, | |
609 | enum audit_state state) | |
610 | { | |
611 | uid_t loginuid = context->loginuid; | |
612 | ||
613 | memset(context, 0, sizeof(*context)); | |
614 | context->state = state; | |
615 | context->loginuid = loginuid; | |
616 | } | |
617 | ||
618 | static inline struct audit_context *audit_alloc_context(enum audit_state state) | |
619 | { | |
620 | struct audit_context *context; | |
621 | ||
622 | if (!(context = kmalloc(sizeof(*context), GFP_KERNEL))) | |
623 | return NULL; | |
624 | audit_zero_context(context, state); | |
625 | return context; | |
626 | } | |
627 | ||
b0dd25a8 RD |
628 | /** |
629 | * audit_alloc - allocate an audit context block for a task | |
630 | * @tsk: task | |
631 | * | |
632 | * Filter on the task information and allocate a per-task audit context | |
1da177e4 LT |
633 | * if necessary. Doing so turns on system call auditing for the |
634 | * specified task. This is called from copy_process, so no lock is | |
b0dd25a8 RD |
635 | * needed. |
636 | */ | |
1da177e4 LT |
637 | int audit_alloc(struct task_struct *tsk) |
638 | { | |
639 | struct audit_context *context; | |
640 | enum audit_state state; | |
641 | ||
642 | if (likely(!audit_enabled)) | |
643 | return 0; /* Return if not auditing. */ | |
644 | ||
645 | state = audit_filter_task(tsk); | |
646 | if (likely(state == AUDIT_DISABLED)) | |
647 | return 0; | |
648 | ||
649 | if (!(context = audit_alloc_context(state))) { | |
650 | audit_log_lost("out of memory in audit_alloc"); | |
651 | return -ENOMEM; | |
652 | } | |
653 | ||
654 | /* Preserve login uid */ | |
655 | context->loginuid = -1; | |
656 | if (current->audit_context) | |
657 | context->loginuid = current->audit_context->loginuid; | |
658 | ||
659 | tsk->audit_context = context; | |
660 | set_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT); | |
661 | return 0; | |
662 | } | |
663 | ||
664 | static inline void audit_free_context(struct audit_context *context) | |
665 | { | |
666 | struct audit_context *previous; | |
667 | int count = 0; | |
668 | ||
669 | do { | |
670 | previous = context->previous; | |
671 | if (previous || (count && count < 10)) { | |
672 | ++count; | |
673 | printk(KERN_ERR "audit(:%d): major=%d name_count=%d:" | |
674 | " freeing multiple contexts (%d)\n", | |
675 | context->serial, context->major, | |
676 | context->name_count, count); | |
677 | } | |
678 | audit_free_names(context); | |
679 | audit_free_aux(context); | |
5adc8a6a | 680 | kfree(context->filterkey); |
1da177e4 LT |
681 | kfree(context); |
682 | context = previous; | |
683 | } while (context); | |
684 | if (count >= 10) | |
685 | printk(KERN_ERR "audit: freed %d contexts\n", count); | |
686 | } | |
687 | ||
e495149b | 688 | static void audit_log_task_context(struct audit_buffer *ab) |
8c8570fb DK |
689 | { |
690 | char *ctx = NULL; | |
691 | ssize_t len = 0; | |
692 | ||
693 | len = security_getprocattr(current, "current", NULL, 0); | |
694 | if (len < 0) { | |
695 | if (len != -EINVAL) | |
696 | goto error_path; | |
697 | return; | |
698 | } | |
699 | ||
e495149b | 700 | ctx = kmalloc(len, GFP_KERNEL); |
7306a0b9 | 701 | if (!ctx) |
8c8570fb | 702 | goto error_path; |
8c8570fb DK |
703 | |
704 | len = security_getprocattr(current, "current", ctx, len); | |
705 | if (len < 0 ) | |
706 | goto error_path; | |
707 | ||
708 | audit_log_format(ab, " subj=%s", ctx); | |
7306a0b9 | 709 | return; |
8c8570fb DK |
710 | |
711 | error_path: | |
9a66a53f | 712 | kfree(ctx); |
7306a0b9 | 713 | audit_panic("error in audit_log_task_context"); |
8c8570fb DK |
714 | return; |
715 | } | |
716 | ||
e495149b | 717 | static void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk) |
219f0817 | 718 | { |
45d9bb0e AV |
719 | char name[sizeof(tsk->comm)]; |
720 | struct mm_struct *mm = tsk->mm; | |
219f0817 SS |
721 | struct vm_area_struct *vma; |
722 | ||
e495149b AV |
723 | /* tsk == current */ |
724 | ||
45d9bb0e | 725 | get_task_comm(name, tsk); |
99e45eea DW |
726 | audit_log_format(ab, " comm="); |
727 | audit_log_untrustedstring(ab, name); | |
219f0817 | 728 | |
e495149b AV |
729 | if (mm) { |
730 | down_read(&mm->mmap_sem); | |
731 | vma = mm->mmap; | |
732 | while (vma) { | |
733 | if ((vma->vm_flags & VM_EXECUTABLE) && | |
734 | vma->vm_file) { | |
735 | audit_log_d_path(ab, "exe=", | |
736 | vma->vm_file->f_dentry, | |
737 | vma->vm_file->f_vfsmnt); | |
738 | break; | |
739 | } | |
740 | vma = vma->vm_next; | |
219f0817 | 741 | } |
e495149b | 742 | up_read(&mm->mmap_sem); |
219f0817 | 743 | } |
e495149b | 744 | audit_log_task_context(ab); |
219f0817 SS |
745 | } |
746 | ||
e495149b | 747 | static void audit_log_exit(struct audit_context *context, struct task_struct *tsk) |
1da177e4 | 748 | { |
9c7aa6aa | 749 | int i, call_panic = 0; |
1da177e4 | 750 | struct audit_buffer *ab; |
7551ced3 | 751 | struct audit_aux_data *aux; |
a6c043a8 | 752 | const char *tty; |
1da177e4 | 753 | |
e495149b AV |
754 | /* tsk == current */ |
755 | ||
756 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_SYSCALL); | |
1da177e4 LT |
757 | if (!ab) |
758 | return; /* audit_panic has been called */ | |
bccf6ae0 DW |
759 | audit_log_format(ab, "arch=%x syscall=%d", |
760 | context->arch, context->major); | |
1da177e4 LT |
761 | if (context->personality != PER_LINUX) |
762 | audit_log_format(ab, " per=%lx", context->personality); | |
763 | if (context->return_valid) | |
2fd6f58b | 764 | audit_log_format(ab, " success=%s exit=%ld", |
765 | (context->return_valid==AUDITSC_SUCCESS)?"yes":"no", | |
766 | context->return_code); | |
45d9bb0e AV |
767 | if (tsk->signal && tsk->signal->tty && tsk->signal->tty->name) |
768 | tty = tsk->signal->tty->name; | |
a6c043a8 SG |
769 | else |
770 | tty = "(none)"; | |
1da177e4 LT |
771 | audit_log_format(ab, |
772 | " a0=%lx a1=%lx a2=%lx a3=%lx items=%d" | |
f46038ff | 773 | " ppid=%d pid=%d auid=%u uid=%u gid=%u" |
326e9c8b | 774 | " euid=%u suid=%u fsuid=%u" |
a6c043a8 | 775 | " egid=%u sgid=%u fsgid=%u tty=%s", |
1da177e4 LT |
776 | context->argv[0], |
777 | context->argv[1], | |
778 | context->argv[2], | |
779 | context->argv[3], | |
780 | context->name_count, | |
f46038ff | 781 | context->ppid, |
1da177e4 LT |
782 | context->pid, |
783 | context->loginuid, | |
784 | context->uid, | |
785 | context->gid, | |
786 | context->euid, context->suid, context->fsuid, | |
a6c043a8 | 787 | context->egid, context->sgid, context->fsgid, tty); |
e495149b | 788 | audit_log_task_info(ab, tsk); |
5adc8a6a AG |
789 | if (context->filterkey) { |
790 | audit_log_format(ab, " key="); | |
791 | audit_log_untrustedstring(ab, context->filterkey); | |
792 | } else | |
793 | audit_log_format(ab, " key=(null)"); | |
1da177e4 | 794 | audit_log_end(ab); |
1da177e4 | 795 | |
7551ced3 | 796 | for (aux = context->aux; aux; aux = aux->next) { |
c0404993 | 797 | |
e495149b | 798 | ab = audit_log_start(context, GFP_KERNEL, aux->type); |
1da177e4 LT |
799 | if (!ab) |
800 | continue; /* audit_panic has been called */ | |
801 | ||
1da177e4 | 802 | switch (aux->type) { |
20ca73bc GW |
803 | case AUDIT_MQ_OPEN: { |
804 | struct audit_aux_data_mq_open *axi = (void *)aux; | |
805 | audit_log_format(ab, | |
806 | "oflag=0x%x mode=%#o mq_flags=0x%lx mq_maxmsg=%ld " | |
807 | "mq_msgsize=%ld mq_curmsgs=%ld", | |
808 | axi->oflag, axi->mode, axi->attr.mq_flags, | |
809 | axi->attr.mq_maxmsg, axi->attr.mq_msgsize, | |
810 | axi->attr.mq_curmsgs); | |
811 | break; } | |
812 | ||
813 | case AUDIT_MQ_SENDRECV: { | |
814 | struct audit_aux_data_mq_sendrecv *axi = (void *)aux; | |
815 | audit_log_format(ab, | |
816 | "mqdes=%d msg_len=%zd msg_prio=%u " | |
817 | "abs_timeout_sec=%ld abs_timeout_nsec=%ld", | |
818 | axi->mqdes, axi->msg_len, axi->msg_prio, | |
819 | axi->abs_timeout.tv_sec, axi->abs_timeout.tv_nsec); | |
820 | break; } | |
821 | ||
822 | case AUDIT_MQ_NOTIFY: { | |
823 | struct audit_aux_data_mq_notify *axi = (void *)aux; | |
824 | audit_log_format(ab, | |
825 | "mqdes=%d sigev_signo=%d", | |
826 | axi->mqdes, | |
827 | axi->notification.sigev_signo); | |
828 | break; } | |
829 | ||
830 | case AUDIT_MQ_GETSETATTR: { | |
831 | struct audit_aux_data_mq_getsetattr *axi = (void *)aux; | |
832 | audit_log_format(ab, | |
833 | "mqdes=%d mq_flags=0x%lx mq_maxmsg=%ld mq_msgsize=%ld " | |
834 | "mq_curmsgs=%ld ", | |
835 | axi->mqdes, | |
836 | axi->mqstat.mq_flags, axi->mqstat.mq_maxmsg, | |
837 | axi->mqstat.mq_msgsize, axi->mqstat.mq_curmsgs); | |
838 | break; } | |
839 | ||
c0404993 | 840 | case AUDIT_IPC: { |
1da177e4 LT |
841 | struct audit_aux_data_ipcctl *axi = (void *)aux; |
842 | audit_log_format(ab, | |
ac03221a LK |
843 | "ouid=%u ogid=%u mode=%x", |
844 | axi->uid, axi->gid, axi->mode); | |
9c7aa6aa SG |
845 | if (axi->osid != 0) { |
846 | char *ctx = NULL; | |
847 | u32 len; | |
848 | if (selinux_ctxid_to_string( | |
849 | axi->osid, &ctx, &len)) { | |
ce29b682 | 850 | audit_log_format(ab, " osid=%u", |
9c7aa6aa SG |
851 | axi->osid); |
852 | call_panic = 1; | |
853 | } else | |
854 | audit_log_format(ab, " obj=%s", ctx); | |
855 | kfree(ctx); | |
856 | } | |
3ec3b2fb DW |
857 | break; } |
858 | ||
073115d6 SG |
859 | case AUDIT_IPC_SET_PERM: { |
860 | struct audit_aux_data_ipcctl *axi = (void *)aux; | |
861 | audit_log_format(ab, | |
ac03221a | 862 | "qbytes=%lx ouid=%u ogid=%u mode=%x", |
073115d6 | 863 | axi->qbytes, axi->uid, axi->gid, axi->mode); |
073115d6 | 864 | break; } |
ac03221a | 865 | |
473ae30b AV |
866 | case AUDIT_EXECVE: { |
867 | struct audit_aux_data_execve *axi = (void *)aux; | |
868 | int i; | |
869 | const char *p; | |
870 | for (i = 0, p = axi->mem; i < axi->argc; i++) { | |
871 | audit_log_format(ab, "a%d=", i); | |
872 | p = audit_log_untrustedstring(ab, p); | |
873 | audit_log_format(ab, "\n"); | |
874 | } | |
875 | break; } | |
073115d6 | 876 | |
3ec3b2fb DW |
877 | case AUDIT_SOCKETCALL: { |
878 | int i; | |
879 | struct audit_aux_data_socketcall *axs = (void *)aux; | |
880 | audit_log_format(ab, "nargs=%d", axs->nargs); | |
881 | for (i=0; i<axs->nargs; i++) | |
882 | audit_log_format(ab, " a%d=%lx", i, axs->args[i]); | |
883 | break; } | |
884 | ||
885 | case AUDIT_SOCKADDR: { | |
886 | struct audit_aux_data_sockaddr *axs = (void *)aux; | |
887 | ||
888 | audit_log_format(ab, "saddr="); | |
889 | audit_log_hex(ab, axs->a, axs->len); | |
890 | break; } | |
01116105 SS |
891 | |
892 | case AUDIT_AVC_PATH: { | |
893 | struct audit_aux_data_path *axi = (void *)aux; | |
894 | audit_log_d_path(ab, "path=", axi->dentry, axi->mnt); | |
01116105 SS |
895 | break; } |
896 | ||
1da177e4 LT |
897 | } |
898 | audit_log_end(ab); | |
1da177e4 LT |
899 | } |
900 | ||
8f37d47c | 901 | if (context->pwd && context->pwdmnt) { |
e495149b | 902 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD); |
8f37d47c DW |
903 | if (ab) { |
904 | audit_log_d_path(ab, "cwd=", context->pwd, context->pwdmnt); | |
905 | audit_log_end(ab); | |
906 | } | |
907 | } | |
1da177e4 | 908 | for (i = 0; i < context->name_count; i++) { |
9c937dcc | 909 | struct audit_names *n = &context->names[i]; |
73241ccc | 910 | |
e495149b | 911 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_PATH); |
1da177e4 LT |
912 | if (!ab) |
913 | continue; /* audit_panic has been called */ | |
8f37d47c | 914 | |
1da177e4 | 915 | audit_log_format(ab, "item=%d", i); |
73241ccc | 916 | |
9c937dcc AG |
917 | if (n->name) { |
918 | switch(n->name_len) { | |
919 | case AUDIT_NAME_FULL: | |
920 | /* log the full path */ | |
921 | audit_log_format(ab, " name="); | |
922 | audit_log_untrustedstring(ab, n->name); | |
923 | break; | |
924 | case 0: | |
925 | /* name was specified as a relative path and the | |
926 | * directory component is the cwd */ | |
927 | audit_log_d_path(ab, " name=", context->pwd, | |
928 | context->pwdmnt); | |
929 | break; | |
930 | default: | |
931 | /* log the name's directory component */ | |
932 | audit_log_format(ab, " name="); | |
933 | audit_log_n_untrustedstring(ab, n->name_len, | |
934 | n->name); | |
935 | } | |
936 | } else | |
937 | audit_log_format(ab, " name=(null)"); | |
938 | ||
939 | if (n->ino != (unsigned long)-1) { | |
940 | audit_log_format(ab, " inode=%lu" | |
941 | " dev=%02x:%02x mode=%#o" | |
942 | " ouid=%u ogid=%u rdev=%02x:%02x", | |
943 | n->ino, | |
944 | MAJOR(n->dev), | |
945 | MINOR(n->dev), | |
946 | n->mode, | |
947 | n->uid, | |
948 | n->gid, | |
949 | MAJOR(n->rdev), | |
950 | MINOR(n->rdev)); | |
951 | } | |
952 | if (n->osid != 0) { | |
1b50eed9 SG |
953 | char *ctx = NULL; |
954 | u32 len; | |
955 | if (selinux_ctxid_to_string( | |
9c937dcc AG |
956 | n->osid, &ctx, &len)) { |
957 | audit_log_format(ab, " osid=%u", n->osid); | |
9c7aa6aa | 958 | call_panic = 2; |
1b50eed9 SG |
959 | } else |
960 | audit_log_format(ab, " obj=%s", ctx); | |
961 | kfree(ctx); | |
8c8570fb DK |
962 | } |
963 | ||
1da177e4 LT |
964 | audit_log_end(ab); |
965 | } | |
9c7aa6aa SG |
966 | if (call_panic) |
967 | audit_panic("error converting sid to string"); | |
1da177e4 LT |
968 | } |
969 | ||
b0dd25a8 RD |
970 | /** |
971 | * audit_free - free a per-task audit context | |
972 | * @tsk: task whose audit context block to free | |
973 | * | |
fa84cb93 | 974 | * Called from copy_process and do_exit |
b0dd25a8 | 975 | */ |
1da177e4 LT |
976 | void audit_free(struct task_struct *tsk) |
977 | { | |
978 | struct audit_context *context; | |
979 | ||
1da177e4 | 980 | context = audit_get_context(tsk, 0, 0); |
1da177e4 LT |
981 | if (likely(!context)) |
982 | return; | |
983 | ||
984 | /* Check for system calls that do not go through the exit | |
f5561964 DW |
985 | * function (e.g., exit_group), then free context block. |
986 | * We use GFP_ATOMIC here because we might be doing this | |
987 | * in the context of the idle thread */ | |
e495149b | 988 | /* that can happen only if we are called from do_exit() */ |
f7056d64 | 989 | if (context->in_syscall && context->auditable) |
e495149b | 990 | audit_log_exit(context, tsk); |
1da177e4 LT |
991 | |
992 | audit_free_context(context); | |
993 | } | |
994 | ||
b0dd25a8 RD |
995 | /** |
996 | * audit_syscall_entry - fill in an audit record at syscall entry | |
997 | * @tsk: task being audited | |
998 | * @arch: architecture type | |
999 | * @major: major syscall type (function) | |
1000 | * @a1: additional syscall register 1 | |
1001 | * @a2: additional syscall register 2 | |
1002 | * @a3: additional syscall register 3 | |
1003 | * @a4: additional syscall register 4 | |
1004 | * | |
1005 | * Fill in audit context at syscall entry. This only happens if the | |
1da177e4 LT |
1006 | * audit context was created when the task was created and the state or |
1007 | * filters demand the audit context be built. If the state from the | |
1008 | * per-task filter or from the per-syscall filter is AUDIT_RECORD_CONTEXT, | |
1009 | * then the record will be written at syscall exit time (otherwise, it | |
1010 | * will only be written if another part of the kernel requests that it | |
b0dd25a8 RD |
1011 | * be written). |
1012 | */ | |
5411be59 | 1013 | void audit_syscall_entry(int arch, int major, |
1da177e4 LT |
1014 | unsigned long a1, unsigned long a2, |
1015 | unsigned long a3, unsigned long a4) | |
1016 | { | |
5411be59 | 1017 | struct task_struct *tsk = current; |
1da177e4 LT |
1018 | struct audit_context *context = tsk->audit_context; |
1019 | enum audit_state state; | |
1020 | ||
1021 | BUG_ON(!context); | |
1022 | ||
b0dd25a8 RD |
1023 | /* |
1024 | * This happens only on certain architectures that make system | |
1da177e4 LT |
1025 | * calls in kernel_thread via the entry.S interface, instead of |
1026 | * with direct calls. (If you are porting to a new | |
1027 | * architecture, hitting this condition can indicate that you | |
1028 | * got the _exit/_leave calls backward in entry.S.) | |
1029 | * | |
1030 | * i386 no | |
1031 | * x86_64 no | |
2ef9481e | 1032 | * ppc64 yes (see arch/powerpc/platforms/iseries/misc.S) |
1da177e4 LT |
1033 | * |
1034 | * This also happens with vm86 emulation in a non-nested manner | |
1035 | * (entries without exits), so this case must be caught. | |
1036 | */ | |
1037 | if (context->in_syscall) { | |
1038 | struct audit_context *newctx; | |
1039 | ||
1da177e4 LT |
1040 | #if AUDIT_DEBUG |
1041 | printk(KERN_ERR | |
1042 | "audit(:%d) pid=%d in syscall=%d;" | |
1043 | " entering syscall=%d\n", | |
1044 | context->serial, tsk->pid, context->major, major); | |
1045 | #endif | |
1046 | newctx = audit_alloc_context(context->state); | |
1047 | if (newctx) { | |
1048 | newctx->previous = context; | |
1049 | context = newctx; | |
1050 | tsk->audit_context = newctx; | |
1051 | } else { | |
1052 | /* If we can't alloc a new context, the best we | |
1053 | * can do is to leak memory (any pending putname | |
1054 | * will be lost). The only other alternative is | |
1055 | * to abandon auditing. */ | |
1056 | audit_zero_context(context, context->state); | |
1057 | } | |
1058 | } | |
1059 | BUG_ON(context->in_syscall || context->name_count); | |
1060 | ||
1061 | if (!audit_enabled) | |
1062 | return; | |
1063 | ||
2fd6f58b | 1064 | context->arch = arch; |
1da177e4 LT |
1065 | context->major = major; |
1066 | context->argv[0] = a1; | |
1067 | context->argv[1] = a2; | |
1068 | context->argv[2] = a3; | |
1069 | context->argv[3] = a4; | |
1070 | ||
1071 | state = context->state; | |
1072 | if (state == AUDIT_SETUP_CONTEXT || state == AUDIT_BUILD_CONTEXT) | |
0f45aa18 | 1073 | state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_ENTRY]); |
1da177e4 LT |
1074 | if (likely(state == AUDIT_DISABLED)) |
1075 | return; | |
1076 | ||
ce625a80 | 1077 | context->serial = 0; |
1da177e4 LT |
1078 | context->ctime = CURRENT_TIME; |
1079 | context->in_syscall = 1; | |
1080 | context->auditable = !!(state == AUDIT_RECORD_CONTEXT); | |
1081 | } | |
1082 | ||
b0dd25a8 RD |
1083 | /** |
1084 | * audit_syscall_exit - deallocate audit context after a system call | |
1085 | * @tsk: task being audited | |
1086 | * @valid: success/failure flag | |
1087 | * @return_code: syscall return value | |
1088 | * | |
1089 | * Tear down after system call. If the audit context has been marked as | |
1da177e4 LT |
1090 | * auditable (either because of the AUDIT_RECORD_CONTEXT state from |
1091 | * filtering, or because some other part of the kernel write an audit | |
1092 | * message), then write out the syscall information. In call cases, | |
b0dd25a8 RD |
1093 | * free the names stored from getname(). |
1094 | */ | |
5411be59 | 1095 | void audit_syscall_exit(int valid, long return_code) |
1da177e4 | 1096 | { |
5411be59 | 1097 | struct task_struct *tsk = current; |
1da177e4 LT |
1098 | struct audit_context *context; |
1099 | ||
2fd6f58b | 1100 | context = audit_get_context(tsk, valid, return_code); |
1da177e4 | 1101 | |
1da177e4 | 1102 | if (likely(!context)) |
97e94c45 | 1103 | return; |
1da177e4 | 1104 | |
f7056d64 | 1105 | if (context->in_syscall && context->auditable) |
e495149b | 1106 | audit_log_exit(context, tsk); |
1da177e4 LT |
1107 | |
1108 | context->in_syscall = 0; | |
1109 | context->auditable = 0; | |
2fd6f58b | 1110 | |
1da177e4 LT |
1111 | if (context->previous) { |
1112 | struct audit_context *new_context = context->previous; | |
1113 | context->previous = NULL; | |
1114 | audit_free_context(context); | |
1115 | tsk->audit_context = new_context; | |
1116 | } else { | |
1117 | audit_free_names(context); | |
1118 | audit_free_aux(context); | |
5adc8a6a AG |
1119 | kfree(context->filterkey); |
1120 | context->filterkey = NULL; | |
1da177e4 LT |
1121 | tsk->audit_context = context; |
1122 | } | |
1da177e4 LT |
1123 | } |
1124 | ||
b0dd25a8 RD |
1125 | /** |
1126 | * audit_getname - add a name to the list | |
1127 | * @name: name to add | |
1128 | * | |
1129 | * Add a name to the list of audit names for this context. | |
1130 | * Called from fs/namei.c:getname(). | |
1131 | */ | |
d8945bb5 | 1132 | void __audit_getname(const char *name) |
1da177e4 LT |
1133 | { |
1134 | struct audit_context *context = current->audit_context; | |
1135 | ||
d8945bb5 | 1136 | if (IS_ERR(name) || !name) |
1da177e4 LT |
1137 | return; |
1138 | ||
1139 | if (!context->in_syscall) { | |
1140 | #if AUDIT_DEBUG == 2 | |
1141 | printk(KERN_ERR "%s:%d(:%d): ignoring getname(%p)\n", | |
1142 | __FILE__, __LINE__, context->serial, name); | |
1143 | dump_stack(); | |
1144 | #endif | |
1145 | return; | |
1146 | } | |
1147 | BUG_ON(context->name_count >= AUDIT_NAMES); | |
1148 | context->names[context->name_count].name = name; | |
9c937dcc AG |
1149 | context->names[context->name_count].name_len = AUDIT_NAME_FULL; |
1150 | context->names[context->name_count].name_put = 1; | |
1da177e4 LT |
1151 | context->names[context->name_count].ino = (unsigned long)-1; |
1152 | ++context->name_count; | |
8f37d47c DW |
1153 | if (!context->pwd) { |
1154 | read_lock(¤t->fs->lock); | |
1155 | context->pwd = dget(current->fs->pwd); | |
1156 | context->pwdmnt = mntget(current->fs->pwdmnt); | |
1157 | read_unlock(¤t->fs->lock); | |
1158 | } | |
1159 | ||
1da177e4 LT |
1160 | } |
1161 | ||
b0dd25a8 RD |
1162 | /* audit_putname - intercept a putname request |
1163 | * @name: name to intercept and delay for putname | |
1164 | * | |
1165 | * If we have stored the name from getname in the audit context, | |
1166 | * then we delay the putname until syscall exit. | |
1167 | * Called from include/linux/fs.h:putname(). | |
1168 | */ | |
1da177e4 LT |
1169 | void audit_putname(const char *name) |
1170 | { | |
1171 | struct audit_context *context = current->audit_context; | |
1172 | ||
1173 | BUG_ON(!context); | |
1174 | if (!context->in_syscall) { | |
1175 | #if AUDIT_DEBUG == 2 | |
1176 | printk(KERN_ERR "%s:%d(:%d): __putname(%p)\n", | |
1177 | __FILE__, __LINE__, context->serial, name); | |
1178 | if (context->name_count) { | |
1179 | int i; | |
1180 | for (i = 0; i < context->name_count; i++) | |
1181 | printk(KERN_ERR "name[%d] = %p = %s\n", i, | |
1182 | context->names[i].name, | |
73241ccc | 1183 | context->names[i].name ?: "(null)"); |
1da177e4 LT |
1184 | } |
1185 | #endif | |
1186 | __putname(name); | |
1187 | } | |
1188 | #if AUDIT_DEBUG | |
1189 | else { | |
1190 | ++context->put_count; | |
1191 | if (context->put_count > context->name_count) { | |
1192 | printk(KERN_ERR "%s:%d(:%d): major=%d" | |
1193 | " in_syscall=%d putname(%p) name_count=%d" | |
1194 | " put_count=%d\n", | |
1195 | __FILE__, __LINE__, | |
1196 | context->serial, context->major, | |
1197 | context->in_syscall, name, context->name_count, | |
1198 | context->put_count); | |
1199 | dump_stack(); | |
1200 | } | |
1201 | } | |
1202 | #endif | |
1203 | } | |
1204 | ||
3e2efce0 AG |
1205 | /* Copy inode data into an audit_names. */ |
1206 | static void audit_copy_inode(struct audit_names *name, const struct inode *inode) | |
8c8570fb | 1207 | { |
3e2efce0 AG |
1208 | name->ino = inode->i_ino; |
1209 | name->dev = inode->i_sb->s_dev; | |
1210 | name->mode = inode->i_mode; | |
1211 | name->uid = inode->i_uid; | |
1212 | name->gid = inode->i_gid; | |
1213 | name->rdev = inode->i_rdev; | |
1214 | selinux_get_inode_sid(inode, &name->osid); | |
8c8570fb DK |
1215 | } |
1216 | ||
b0dd25a8 RD |
1217 | /** |
1218 | * audit_inode - store the inode and device from a lookup | |
1219 | * @name: name being audited | |
1220 | * @inode: inode being audited | |
b0dd25a8 RD |
1221 | * |
1222 | * Called from fs/namei.c:path_lookup(). | |
1223 | */ | |
9c937dcc | 1224 | void __audit_inode(const char *name, const struct inode *inode) |
1da177e4 LT |
1225 | { |
1226 | int idx; | |
1227 | struct audit_context *context = current->audit_context; | |
1228 | ||
1229 | if (!context->in_syscall) | |
1230 | return; | |
1231 | if (context->name_count | |
1232 | && context->names[context->name_count-1].name | |
1233 | && context->names[context->name_count-1].name == name) | |
1234 | idx = context->name_count - 1; | |
1235 | else if (context->name_count > 1 | |
1236 | && context->names[context->name_count-2].name | |
1237 | && context->names[context->name_count-2].name == name) | |
1238 | idx = context->name_count - 2; | |
1239 | else { | |
1240 | /* FIXME: how much do we care about inodes that have no | |
1241 | * associated name? */ | |
1242 | if (context->name_count >= AUDIT_NAMES - AUDIT_NAMES_RESERVED) | |
1243 | return; | |
1244 | idx = context->name_count++; | |
1245 | context->names[idx].name = NULL; | |
1246 | #if AUDIT_DEBUG | |
1247 | ++context->ino_count; | |
1248 | #endif | |
1249 | } | |
3e2efce0 | 1250 | audit_copy_inode(&context->names[idx], inode); |
73241ccc AG |
1251 | } |
1252 | ||
1253 | /** | |
1254 | * audit_inode_child - collect inode info for created/removed objects | |
1255 | * @dname: inode's dentry name | |
1256 | * @inode: inode being audited | |
73d3ec5a | 1257 | * @parent: inode of dentry parent |
73241ccc AG |
1258 | * |
1259 | * For syscalls that create or remove filesystem objects, audit_inode | |
1260 | * can only collect information for the filesystem object's parent. | |
1261 | * This call updates the audit context with the child's information. | |
1262 | * Syscalls that create a new filesystem object must be hooked after | |
1263 | * the object is created. Syscalls that remove a filesystem object | |
1264 | * must be hooked prior, in order to capture the target inode during | |
1265 | * unsuccessful attempts. | |
1266 | */ | |
1267 | void __audit_inode_child(const char *dname, const struct inode *inode, | |
73d3ec5a | 1268 | const struct inode *parent) |
73241ccc AG |
1269 | { |
1270 | int idx; | |
1271 | struct audit_context *context = current->audit_context; | |
9c937dcc AG |
1272 | const char *found_name = NULL; |
1273 | int dirlen = 0; | |
73241ccc AG |
1274 | |
1275 | if (!context->in_syscall) | |
1276 | return; | |
1277 | ||
1278 | /* determine matching parent */ | |
f368c07d | 1279 | if (!dname) |
9c937dcc | 1280 | goto update_context; |
f368c07d | 1281 | for (idx = 0; idx < context->name_count; idx++) |
73d3ec5a | 1282 | if (context->names[idx].ino == parent->i_ino) { |
f368c07d | 1283 | const char *name = context->names[idx].name; |
73241ccc | 1284 | |
f368c07d AG |
1285 | if (!name) |
1286 | continue; | |
1287 | ||
9c937dcc AG |
1288 | if (audit_compare_dname_path(dname, name, &dirlen) == 0) { |
1289 | context->names[idx].name_len = dirlen; | |
1290 | found_name = name; | |
1291 | break; | |
1292 | } | |
f368c07d | 1293 | } |
73241ccc | 1294 | |
9c937dcc | 1295 | update_context: |
73241ccc | 1296 | idx = context->name_count++; |
73241ccc AG |
1297 | #if AUDIT_DEBUG |
1298 | context->ino_count++; | |
1299 | #endif | |
9c937dcc AG |
1300 | /* Re-use the name belonging to the slot for a matching parent directory. |
1301 | * All names for this context are relinquished in audit_free_names() */ | |
1302 | context->names[idx].name = found_name; | |
1303 | context->names[idx].name_len = AUDIT_NAME_FULL; | |
1304 | context->names[idx].name_put = 0; /* don't call __putname() */ | |
73241ccc | 1305 | |
3e2efce0 AG |
1306 | if (!inode) |
1307 | context->names[idx].ino = (unsigned long)-1; | |
1308 | else | |
1309 | audit_copy_inode(&context->names[idx], inode); | |
73d3ec5a AG |
1310 | |
1311 | /* A parent was not found in audit_names, so copy the inode data for the | |
1312 | * provided parent. */ | |
1313 | if (!found_name) { | |
1314 | idx = context->name_count++; | |
1315 | #if AUDIT_DEBUG | |
1316 | context->ino_count++; | |
1317 | #endif | |
1318 | audit_copy_inode(&context->names[idx], parent); | |
1319 | } | |
3e2efce0 AG |
1320 | } |
1321 | ||
1322 | /** | |
1323 | * audit_inode_update - update inode info for last collected name | |
1324 | * @inode: inode being audited | |
1325 | * | |
1326 | * When open() is called on an existing object with the O_CREAT flag, the inode | |
1327 | * data audit initially collects is incorrect. This additional hook ensures | |
1328 | * audit has the inode data for the actual object to be opened. | |
1329 | */ | |
1330 | void __audit_inode_update(const struct inode *inode) | |
1331 | { | |
1332 | struct audit_context *context = current->audit_context; | |
1333 | int idx; | |
1334 | ||
1335 | if (!context->in_syscall || !inode) | |
1336 | return; | |
1337 | ||
1338 | if (context->name_count == 0) { | |
1339 | context->name_count++; | |
1340 | #if AUDIT_DEBUG | |
1341 | context->ino_count++; | |
1342 | #endif | |
1343 | } | |
1344 | idx = context->name_count - 1; | |
1345 | ||
1346 | audit_copy_inode(&context->names[idx], inode); | |
1da177e4 LT |
1347 | } |
1348 | ||
b0dd25a8 RD |
1349 | /** |
1350 | * auditsc_get_stamp - get local copies of audit_context values | |
1351 | * @ctx: audit_context for the task | |
1352 | * @t: timespec to store time recorded in the audit_context | |
1353 | * @serial: serial value that is recorded in the audit_context | |
1354 | * | |
1355 | * Also sets the context as auditable. | |
1356 | */ | |
bfb4496e DW |
1357 | void auditsc_get_stamp(struct audit_context *ctx, |
1358 | struct timespec *t, unsigned int *serial) | |
1da177e4 | 1359 | { |
ce625a80 DW |
1360 | if (!ctx->serial) |
1361 | ctx->serial = audit_serial(); | |
bfb4496e DW |
1362 | t->tv_sec = ctx->ctime.tv_sec; |
1363 | t->tv_nsec = ctx->ctime.tv_nsec; | |
1364 | *serial = ctx->serial; | |
1365 | ctx->auditable = 1; | |
1da177e4 LT |
1366 | } |
1367 | ||
b0dd25a8 RD |
1368 | /** |
1369 | * audit_set_loginuid - set a task's audit_context loginuid | |
1370 | * @task: task whose audit context is being modified | |
1371 | * @loginuid: loginuid value | |
1372 | * | |
1373 | * Returns 0. | |
1374 | * | |
1375 | * Called (set) from fs/proc/base.c::proc_loginuid_write(). | |
1376 | */ | |
456be6cd | 1377 | int audit_set_loginuid(struct task_struct *task, uid_t loginuid) |
1da177e4 | 1378 | { |
41757106 SG |
1379 | struct audit_context *context = task->audit_context; |
1380 | ||
1381 | if (context) { | |
1382 | /* Only log if audit is enabled */ | |
1383 | if (context->in_syscall) { | |
1384 | struct audit_buffer *ab; | |
1385 | ||
1386 | ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_LOGIN); | |
1387 | if (ab) { | |
1388 | audit_log_format(ab, "login pid=%d uid=%u " | |
1389 | "old auid=%u new auid=%u", | |
1390 | task->pid, task->uid, | |
1391 | context->loginuid, loginuid); | |
1392 | audit_log_end(ab); | |
1393 | } | |
c0404993 | 1394 | } |
41757106 | 1395 | context->loginuid = loginuid; |
1da177e4 LT |
1396 | } |
1397 | return 0; | |
1398 | } | |
1399 | ||
b0dd25a8 RD |
1400 | /** |
1401 | * audit_get_loginuid - get the loginuid for an audit_context | |
1402 | * @ctx: the audit_context | |
1403 | * | |
1404 | * Returns the context's loginuid or -1 if @ctx is NULL. | |
1405 | */ | |
1da177e4 LT |
1406 | uid_t audit_get_loginuid(struct audit_context *ctx) |
1407 | { | |
1408 | return ctx ? ctx->loginuid : -1; | |
1409 | } | |
1410 | ||
20ca73bc GW |
1411 | /** |
1412 | * __audit_mq_open - record audit data for a POSIX MQ open | |
1413 | * @oflag: open flag | |
1414 | * @mode: mode bits | |
1415 | * @u_attr: queue attributes | |
1416 | * | |
1417 | * Returns 0 for success or NULL context or < 0 on error. | |
1418 | */ | |
1419 | int __audit_mq_open(int oflag, mode_t mode, struct mq_attr __user *u_attr) | |
1420 | { | |
1421 | struct audit_aux_data_mq_open *ax; | |
1422 | struct audit_context *context = current->audit_context; | |
1423 | ||
1424 | if (!audit_enabled) | |
1425 | return 0; | |
1426 | ||
1427 | if (likely(!context)) | |
1428 | return 0; | |
1429 | ||
1430 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1431 | if (!ax) | |
1432 | return -ENOMEM; | |
1433 | ||
1434 | if (u_attr != NULL) { | |
1435 | if (copy_from_user(&ax->attr, u_attr, sizeof(ax->attr))) { | |
1436 | kfree(ax); | |
1437 | return -EFAULT; | |
1438 | } | |
1439 | } else | |
1440 | memset(&ax->attr, 0, sizeof(ax->attr)); | |
1441 | ||
1442 | ax->oflag = oflag; | |
1443 | ax->mode = mode; | |
1444 | ||
1445 | ax->d.type = AUDIT_MQ_OPEN; | |
1446 | ax->d.next = context->aux; | |
1447 | context->aux = (void *)ax; | |
1448 | return 0; | |
1449 | } | |
1450 | ||
1451 | /** | |
1452 | * __audit_mq_timedsend - record audit data for a POSIX MQ timed send | |
1453 | * @mqdes: MQ descriptor | |
1454 | * @msg_len: Message length | |
1455 | * @msg_prio: Message priority | |
1dbe83c3 | 1456 | * @u_abs_timeout: Message timeout in absolute time |
20ca73bc GW |
1457 | * |
1458 | * Returns 0 for success or NULL context or < 0 on error. | |
1459 | */ | |
1460 | int __audit_mq_timedsend(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, | |
1461 | const struct timespec __user *u_abs_timeout) | |
1462 | { | |
1463 | struct audit_aux_data_mq_sendrecv *ax; | |
1464 | struct audit_context *context = current->audit_context; | |
1465 | ||
1466 | if (!audit_enabled) | |
1467 | return 0; | |
1468 | ||
1469 | if (likely(!context)) | |
1470 | return 0; | |
1471 | ||
1472 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1473 | if (!ax) | |
1474 | return -ENOMEM; | |
1475 | ||
1476 | if (u_abs_timeout != NULL) { | |
1477 | if (copy_from_user(&ax->abs_timeout, u_abs_timeout, sizeof(ax->abs_timeout))) { | |
1478 | kfree(ax); | |
1479 | return -EFAULT; | |
1480 | } | |
1481 | } else | |
1482 | memset(&ax->abs_timeout, 0, sizeof(ax->abs_timeout)); | |
1483 | ||
1484 | ax->mqdes = mqdes; | |
1485 | ax->msg_len = msg_len; | |
1486 | ax->msg_prio = msg_prio; | |
1487 | ||
1488 | ax->d.type = AUDIT_MQ_SENDRECV; | |
1489 | ax->d.next = context->aux; | |
1490 | context->aux = (void *)ax; | |
1491 | return 0; | |
1492 | } | |
1493 | ||
1494 | /** | |
1495 | * __audit_mq_timedreceive - record audit data for a POSIX MQ timed receive | |
1496 | * @mqdes: MQ descriptor | |
1497 | * @msg_len: Message length | |
1dbe83c3 RD |
1498 | * @u_msg_prio: Message priority |
1499 | * @u_abs_timeout: Message timeout in absolute time | |
20ca73bc GW |
1500 | * |
1501 | * Returns 0 for success or NULL context or < 0 on error. | |
1502 | */ | |
1503 | int __audit_mq_timedreceive(mqd_t mqdes, size_t msg_len, | |
1504 | unsigned int __user *u_msg_prio, | |
1505 | const struct timespec __user *u_abs_timeout) | |
1506 | { | |
1507 | struct audit_aux_data_mq_sendrecv *ax; | |
1508 | struct audit_context *context = current->audit_context; | |
1509 | ||
1510 | if (!audit_enabled) | |
1511 | return 0; | |
1512 | ||
1513 | if (likely(!context)) | |
1514 | return 0; | |
1515 | ||
1516 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1517 | if (!ax) | |
1518 | return -ENOMEM; | |
1519 | ||
1520 | if (u_msg_prio != NULL) { | |
1521 | if (get_user(ax->msg_prio, u_msg_prio)) { | |
1522 | kfree(ax); | |
1523 | return -EFAULT; | |
1524 | } | |
1525 | } else | |
1526 | ax->msg_prio = 0; | |
1527 | ||
1528 | if (u_abs_timeout != NULL) { | |
1529 | if (copy_from_user(&ax->abs_timeout, u_abs_timeout, sizeof(ax->abs_timeout))) { | |
1530 | kfree(ax); | |
1531 | return -EFAULT; | |
1532 | } | |
1533 | } else | |
1534 | memset(&ax->abs_timeout, 0, sizeof(ax->abs_timeout)); | |
1535 | ||
1536 | ax->mqdes = mqdes; | |
1537 | ax->msg_len = msg_len; | |
1538 | ||
1539 | ax->d.type = AUDIT_MQ_SENDRECV; | |
1540 | ax->d.next = context->aux; | |
1541 | context->aux = (void *)ax; | |
1542 | return 0; | |
1543 | } | |
1544 | ||
1545 | /** | |
1546 | * __audit_mq_notify - record audit data for a POSIX MQ notify | |
1547 | * @mqdes: MQ descriptor | |
1548 | * @u_notification: Notification event | |
1549 | * | |
1550 | * Returns 0 for success or NULL context or < 0 on error. | |
1551 | */ | |
1552 | ||
1553 | int __audit_mq_notify(mqd_t mqdes, const struct sigevent __user *u_notification) | |
1554 | { | |
1555 | struct audit_aux_data_mq_notify *ax; | |
1556 | struct audit_context *context = current->audit_context; | |
1557 | ||
1558 | if (!audit_enabled) | |
1559 | return 0; | |
1560 | ||
1561 | if (likely(!context)) | |
1562 | return 0; | |
1563 | ||
1564 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1565 | if (!ax) | |
1566 | return -ENOMEM; | |
1567 | ||
1568 | if (u_notification != NULL) { | |
1569 | if (copy_from_user(&ax->notification, u_notification, sizeof(ax->notification))) { | |
1570 | kfree(ax); | |
1571 | return -EFAULT; | |
1572 | } | |
1573 | } else | |
1574 | memset(&ax->notification, 0, sizeof(ax->notification)); | |
1575 | ||
1576 | ax->mqdes = mqdes; | |
1577 | ||
1578 | ax->d.type = AUDIT_MQ_NOTIFY; | |
1579 | ax->d.next = context->aux; | |
1580 | context->aux = (void *)ax; | |
1581 | return 0; | |
1582 | } | |
1583 | ||
1584 | /** | |
1585 | * __audit_mq_getsetattr - record audit data for a POSIX MQ get/set attribute | |
1586 | * @mqdes: MQ descriptor | |
1587 | * @mqstat: MQ flags | |
1588 | * | |
1589 | * Returns 0 for success or NULL context or < 0 on error. | |
1590 | */ | |
1591 | int __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat) | |
1592 | { | |
1593 | struct audit_aux_data_mq_getsetattr *ax; | |
1594 | struct audit_context *context = current->audit_context; | |
1595 | ||
1596 | if (!audit_enabled) | |
1597 | return 0; | |
1598 | ||
1599 | if (likely(!context)) | |
1600 | return 0; | |
1601 | ||
1602 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1603 | if (!ax) | |
1604 | return -ENOMEM; | |
1605 | ||
1606 | ax->mqdes = mqdes; | |
1607 | ax->mqstat = *mqstat; | |
1608 | ||
1609 | ax->d.type = AUDIT_MQ_GETSETATTR; | |
1610 | ax->d.next = context->aux; | |
1611 | context->aux = (void *)ax; | |
1612 | return 0; | |
1613 | } | |
1614 | ||
b0dd25a8 | 1615 | /** |
073115d6 SG |
1616 | * audit_ipc_obj - record audit data for ipc object |
1617 | * @ipcp: ipc permissions | |
1618 | * | |
1619 | * Returns 0 for success or NULL context or < 0 on error. | |
1620 | */ | |
d8945bb5 | 1621 | int __audit_ipc_obj(struct kern_ipc_perm *ipcp) |
073115d6 SG |
1622 | { |
1623 | struct audit_aux_data_ipcctl *ax; | |
1624 | struct audit_context *context = current->audit_context; | |
1625 | ||
073115d6 SG |
1626 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); |
1627 | if (!ax) | |
1628 | return -ENOMEM; | |
1629 | ||
1630 | ax->uid = ipcp->uid; | |
1631 | ax->gid = ipcp->gid; | |
1632 | ax->mode = ipcp->mode; | |
1633 | selinux_get_ipc_sid(ipcp, &ax->osid); | |
1634 | ||
1635 | ax->d.type = AUDIT_IPC; | |
1636 | ax->d.next = context->aux; | |
1637 | context->aux = (void *)ax; | |
1638 | return 0; | |
1639 | } | |
1640 | ||
1641 | /** | |
1642 | * audit_ipc_set_perm - record audit data for new ipc permissions | |
b0dd25a8 RD |
1643 | * @qbytes: msgq bytes |
1644 | * @uid: msgq user id | |
1645 | * @gid: msgq group id | |
1646 | * @mode: msgq mode (permissions) | |
1647 | * | |
1648 | * Returns 0 for success or NULL context or < 0 on error. | |
1649 | */ | |
d8945bb5 | 1650 | int __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode) |
1da177e4 LT |
1651 | { |
1652 | struct audit_aux_data_ipcctl *ax; | |
1653 | struct audit_context *context = current->audit_context; | |
1654 | ||
8c8570fb | 1655 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); |
1da177e4 LT |
1656 | if (!ax) |
1657 | return -ENOMEM; | |
1658 | ||
1659 | ax->qbytes = qbytes; | |
1660 | ax->uid = uid; | |
1661 | ax->gid = gid; | |
1662 | ax->mode = mode; | |
1663 | ||
073115d6 | 1664 | ax->d.type = AUDIT_IPC_SET_PERM; |
1da177e4 LT |
1665 | ax->d.next = context->aux; |
1666 | context->aux = (void *)ax; | |
1667 | return 0; | |
1668 | } | |
c2f0c7c3 | 1669 | |
473ae30b AV |
1670 | int audit_bprm(struct linux_binprm *bprm) |
1671 | { | |
1672 | struct audit_aux_data_execve *ax; | |
1673 | struct audit_context *context = current->audit_context; | |
1674 | unsigned long p, next; | |
1675 | void *to; | |
1676 | ||
1677 | if (likely(!audit_enabled || !context)) | |
1678 | return 0; | |
1679 | ||
1680 | ax = kmalloc(sizeof(*ax) + PAGE_SIZE * MAX_ARG_PAGES - bprm->p, | |
1681 | GFP_KERNEL); | |
1682 | if (!ax) | |
1683 | return -ENOMEM; | |
1684 | ||
1685 | ax->argc = bprm->argc; | |
1686 | ax->envc = bprm->envc; | |
1687 | for (p = bprm->p, to = ax->mem; p < MAX_ARG_PAGES*PAGE_SIZE; p = next) { | |
1688 | struct page *page = bprm->page[p / PAGE_SIZE]; | |
1689 | void *kaddr = kmap(page); | |
1690 | next = (p + PAGE_SIZE) & ~(PAGE_SIZE - 1); | |
1691 | memcpy(to, kaddr + (p & (PAGE_SIZE - 1)), next - p); | |
1692 | to += next - p; | |
1693 | kunmap(page); | |
1694 | } | |
1695 | ||
1696 | ax->d.type = AUDIT_EXECVE; | |
1697 | ax->d.next = context->aux; | |
1698 | context->aux = (void *)ax; | |
1699 | return 0; | |
1700 | } | |
1701 | ||
1702 | ||
b0dd25a8 RD |
1703 | /** |
1704 | * audit_socketcall - record audit data for sys_socketcall | |
1705 | * @nargs: number of args | |
1706 | * @args: args array | |
1707 | * | |
1708 | * Returns 0 for success or NULL context or < 0 on error. | |
1709 | */ | |
3ec3b2fb DW |
1710 | int audit_socketcall(int nargs, unsigned long *args) |
1711 | { | |
1712 | struct audit_aux_data_socketcall *ax; | |
1713 | struct audit_context *context = current->audit_context; | |
1714 | ||
1715 | if (likely(!context)) | |
1716 | return 0; | |
1717 | ||
1718 | ax = kmalloc(sizeof(*ax) + nargs * sizeof(unsigned long), GFP_KERNEL); | |
1719 | if (!ax) | |
1720 | return -ENOMEM; | |
1721 | ||
1722 | ax->nargs = nargs; | |
1723 | memcpy(ax->args, args, nargs * sizeof(unsigned long)); | |
1724 | ||
1725 | ax->d.type = AUDIT_SOCKETCALL; | |
1726 | ax->d.next = context->aux; | |
1727 | context->aux = (void *)ax; | |
1728 | return 0; | |
1729 | } | |
1730 | ||
b0dd25a8 RD |
1731 | /** |
1732 | * audit_sockaddr - record audit data for sys_bind, sys_connect, sys_sendto | |
1733 | * @len: data length in user space | |
1734 | * @a: data address in kernel space | |
1735 | * | |
1736 | * Returns 0 for success or NULL context or < 0 on error. | |
1737 | */ | |
3ec3b2fb DW |
1738 | int audit_sockaddr(int len, void *a) |
1739 | { | |
1740 | struct audit_aux_data_sockaddr *ax; | |
1741 | struct audit_context *context = current->audit_context; | |
1742 | ||
1743 | if (likely(!context)) | |
1744 | return 0; | |
1745 | ||
1746 | ax = kmalloc(sizeof(*ax) + len, GFP_KERNEL); | |
1747 | if (!ax) | |
1748 | return -ENOMEM; | |
1749 | ||
1750 | ax->len = len; | |
1751 | memcpy(ax->a, a, len); | |
1752 | ||
1753 | ax->d.type = AUDIT_SOCKADDR; | |
1754 | ax->d.next = context->aux; | |
1755 | context->aux = (void *)ax; | |
1756 | return 0; | |
1757 | } | |
1758 | ||
b0dd25a8 RD |
1759 | /** |
1760 | * audit_avc_path - record the granting or denial of permissions | |
1761 | * @dentry: dentry to record | |
1762 | * @mnt: mnt to record | |
1763 | * | |
1764 | * Returns 0 for success or NULL context or < 0 on error. | |
1765 | * | |
1766 | * Called from security/selinux/avc.c::avc_audit() | |
1767 | */ | |
01116105 SS |
1768 | int audit_avc_path(struct dentry *dentry, struct vfsmount *mnt) |
1769 | { | |
1770 | struct audit_aux_data_path *ax; | |
1771 | struct audit_context *context = current->audit_context; | |
1772 | ||
1773 | if (likely(!context)) | |
1774 | return 0; | |
1775 | ||
1776 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1777 | if (!ax) | |
1778 | return -ENOMEM; | |
1779 | ||
1780 | ax->dentry = dget(dentry); | |
1781 | ax->mnt = mntget(mnt); | |
1782 | ||
1783 | ax->d.type = AUDIT_AVC_PATH; | |
1784 | ax->d.next = context->aux; | |
1785 | context->aux = (void *)ax; | |
1786 | return 0; | |
1787 | } | |
1788 | ||
b0dd25a8 RD |
1789 | /** |
1790 | * audit_signal_info - record signal info for shutting down audit subsystem | |
1791 | * @sig: signal value | |
1792 | * @t: task being signaled | |
1793 | * | |
1794 | * If the audit subsystem is being terminated, record the task (pid) | |
1795 | * and uid that is doing that. | |
1796 | */ | |
e1396065 | 1797 | void __audit_signal_info(int sig, struct task_struct *t) |
c2f0c7c3 SG |
1798 | { |
1799 | extern pid_t audit_sig_pid; | |
1800 | extern uid_t audit_sig_uid; | |
e1396065 AV |
1801 | extern u32 audit_sig_sid; |
1802 | ||
1803 | if (sig == SIGTERM || sig == SIGHUP || sig == SIGUSR1) { | |
1804 | struct task_struct *tsk = current; | |
1805 | struct audit_context *ctx = tsk->audit_context; | |
1806 | audit_sig_pid = tsk->pid; | |
1807 | if (ctx) | |
1808 | audit_sig_uid = ctx->loginuid; | |
1809 | else | |
1810 | audit_sig_uid = tsk->uid; | |
1811 | selinux_get_task_sid(tsk, &audit_sig_sid); | |
c2f0c7c3 SG |
1812 | } |
1813 | } |