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 | ||
1da177e4 LT |
88 | /* When fs/namei.c:getname() is called, we store the pointer in name and |
89 | * we don't let putname() free it (instead we free all of the saved | |
90 | * pointers at syscall exit time). | |
91 | * | |
92 | * Further, in fs/namei.c:path_lookup() we store the inode and device. */ | |
93 | struct audit_names { | |
94 | const char *name; | |
9c937dcc AG |
95 | int name_len; /* number of name's characters to log */ |
96 | unsigned name_put; /* call __putname() for this name */ | |
1da177e4 LT |
97 | unsigned long ino; |
98 | dev_t dev; | |
99 | umode_t mode; | |
100 | uid_t uid; | |
101 | gid_t gid; | |
102 | dev_t rdev; | |
1b50eed9 | 103 | u32 osid; |
1da177e4 LT |
104 | }; |
105 | ||
106 | struct audit_aux_data { | |
107 | struct audit_aux_data *next; | |
108 | int type; | |
109 | }; | |
110 | ||
111 | #define AUDIT_AUX_IPCPERM 0 | |
112 | ||
20ca73bc GW |
113 | struct audit_aux_data_mq_open { |
114 | struct audit_aux_data d; | |
115 | int oflag; | |
116 | mode_t mode; | |
117 | struct mq_attr attr; | |
118 | }; | |
119 | ||
120 | struct audit_aux_data_mq_sendrecv { | |
121 | struct audit_aux_data d; | |
122 | mqd_t mqdes; | |
123 | size_t msg_len; | |
124 | unsigned int msg_prio; | |
125 | struct timespec abs_timeout; | |
126 | }; | |
127 | ||
128 | struct audit_aux_data_mq_notify { | |
129 | struct audit_aux_data d; | |
130 | mqd_t mqdes; | |
131 | struct sigevent notification; | |
132 | }; | |
133 | ||
134 | struct audit_aux_data_mq_getsetattr { | |
135 | struct audit_aux_data d; | |
136 | mqd_t mqdes; | |
137 | struct mq_attr mqstat; | |
138 | }; | |
139 | ||
1da177e4 LT |
140 | struct audit_aux_data_ipcctl { |
141 | struct audit_aux_data d; | |
142 | struct ipc_perm p; | |
143 | unsigned long qbytes; | |
144 | uid_t uid; | |
145 | gid_t gid; | |
146 | mode_t mode; | |
9c7aa6aa | 147 | u32 osid; |
1da177e4 LT |
148 | }; |
149 | ||
473ae30b AV |
150 | struct audit_aux_data_execve { |
151 | struct audit_aux_data d; | |
152 | int argc; | |
153 | int envc; | |
154 | char mem[0]; | |
155 | }; | |
156 | ||
3ec3b2fb DW |
157 | struct audit_aux_data_socketcall { |
158 | struct audit_aux_data d; | |
159 | int nargs; | |
160 | unsigned long args[0]; | |
161 | }; | |
162 | ||
163 | struct audit_aux_data_sockaddr { | |
164 | struct audit_aux_data d; | |
165 | int len; | |
166 | char a[0]; | |
167 | }; | |
168 | ||
01116105 SS |
169 | struct audit_aux_data_path { |
170 | struct audit_aux_data d; | |
171 | struct dentry *dentry; | |
172 | struct vfsmount *mnt; | |
173 | }; | |
1da177e4 LT |
174 | |
175 | /* The per-task audit context. */ | |
176 | struct audit_context { | |
177 | int in_syscall; /* 1 if task is in a syscall */ | |
178 | enum audit_state state; | |
179 | unsigned int serial; /* serial number for record */ | |
180 | struct timespec ctime; /* time of syscall entry */ | |
181 | uid_t loginuid; /* login uid (identity) */ | |
182 | int major; /* syscall number */ | |
183 | unsigned long argv[4]; /* syscall arguments */ | |
184 | int return_valid; /* return code is valid */ | |
2fd6f58b | 185 | long return_code;/* syscall return code */ |
1da177e4 LT |
186 | int auditable; /* 1 if record should be written */ |
187 | int name_count; | |
188 | struct audit_names names[AUDIT_NAMES]; | |
5adc8a6a | 189 | char * filterkey; /* key for rule that triggered record */ |
8f37d47c DW |
190 | struct dentry * pwd; |
191 | struct vfsmount * pwdmnt; | |
1da177e4 LT |
192 | struct audit_context *previous; /* For nested syscalls */ |
193 | struct audit_aux_data *aux; | |
194 | ||
195 | /* Save things to print about task_struct */ | |
f46038ff | 196 | pid_t pid, ppid; |
1da177e4 LT |
197 | uid_t uid, euid, suid, fsuid; |
198 | gid_t gid, egid, sgid, fsgid; | |
199 | unsigned long personality; | |
2fd6f58b | 200 | int arch; |
1da177e4 LT |
201 | |
202 | #if AUDIT_DEBUG | |
203 | int put_count; | |
204 | int ino_count; | |
205 | #endif | |
206 | }; | |
207 | ||
f368c07d | 208 | /* Determine if any context name data matches a rule's watch data */ |
1da177e4 LT |
209 | /* Compare a task_struct with an audit_rule. Return 1 on match, 0 |
210 | * otherwise. */ | |
211 | static int audit_filter_rules(struct task_struct *tsk, | |
93315ed6 | 212 | struct audit_krule *rule, |
1da177e4 | 213 | struct audit_context *ctx, |
f368c07d | 214 | struct audit_names *name, |
1da177e4 LT |
215 | enum audit_state *state) |
216 | { | |
2ad312d2 | 217 | int i, j, need_sid = 1; |
3dc7e315 DG |
218 | u32 sid; |
219 | ||
1da177e4 | 220 | for (i = 0; i < rule->field_count; i++) { |
93315ed6 | 221 | struct audit_field *f = &rule->fields[i]; |
1da177e4 LT |
222 | int result = 0; |
223 | ||
93315ed6 | 224 | switch (f->type) { |
1da177e4 | 225 | case AUDIT_PID: |
93315ed6 | 226 | result = audit_comparator(tsk->pid, f->op, f->val); |
1da177e4 | 227 | break; |
3c66251e AV |
228 | case AUDIT_PPID: |
229 | if (ctx) | |
230 | result = audit_comparator(ctx->ppid, f->op, f->val); | |
231 | break; | |
1da177e4 | 232 | case AUDIT_UID: |
93315ed6 | 233 | result = audit_comparator(tsk->uid, f->op, f->val); |
1da177e4 LT |
234 | break; |
235 | case AUDIT_EUID: | |
93315ed6 | 236 | result = audit_comparator(tsk->euid, f->op, f->val); |
1da177e4 LT |
237 | break; |
238 | case AUDIT_SUID: | |
93315ed6 | 239 | result = audit_comparator(tsk->suid, f->op, f->val); |
1da177e4 LT |
240 | break; |
241 | case AUDIT_FSUID: | |
93315ed6 | 242 | result = audit_comparator(tsk->fsuid, f->op, f->val); |
1da177e4 LT |
243 | break; |
244 | case AUDIT_GID: | |
93315ed6 | 245 | result = audit_comparator(tsk->gid, f->op, f->val); |
1da177e4 LT |
246 | break; |
247 | case AUDIT_EGID: | |
93315ed6 | 248 | result = audit_comparator(tsk->egid, f->op, f->val); |
1da177e4 LT |
249 | break; |
250 | case AUDIT_SGID: | |
93315ed6 | 251 | result = audit_comparator(tsk->sgid, f->op, f->val); |
1da177e4 LT |
252 | break; |
253 | case AUDIT_FSGID: | |
93315ed6 | 254 | result = audit_comparator(tsk->fsgid, f->op, f->val); |
1da177e4 LT |
255 | break; |
256 | case AUDIT_PERS: | |
93315ed6 | 257 | result = audit_comparator(tsk->personality, f->op, f->val); |
1da177e4 | 258 | break; |
2fd6f58b | 259 | case AUDIT_ARCH: |
b63862f4 | 260 | if (ctx) |
93315ed6 | 261 | result = audit_comparator(ctx->arch, f->op, f->val); |
2fd6f58b | 262 | break; |
1da177e4 LT |
263 | |
264 | case AUDIT_EXIT: | |
265 | if (ctx && ctx->return_valid) | |
93315ed6 | 266 | result = audit_comparator(ctx->return_code, f->op, f->val); |
1da177e4 LT |
267 | break; |
268 | case AUDIT_SUCCESS: | |
b01f2cc1 | 269 | if (ctx && ctx->return_valid) { |
93315ed6 AG |
270 | if (f->val) |
271 | result = audit_comparator(ctx->return_valid, f->op, AUDITSC_SUCCESS); | |
b01f2cc1 | 272 | else |
93315ed6 | 273 | result = audit_comparator(ctx->return_valid, f->op, AUDITSC_FAILURE); |
b01f2cc1 | 274 | } |
1da177e4 LT |
275 | break; |
276 | case AUDIT_DEVMAJOR: | |
f368c07d AG |
277 | if (name) |
278 | result = audit_comparator(MAJOR(name->dev), | |
279 | f->op, f->val); | |
280 | else if (ctx) { | |
1da177e4 | 281 | for (j = 0; j < ctx->name_count; j++) { |
93315ed6 | 282 | if (audit_comparator(MAJOR(ctx->names[j].dev), f->op, f->val)) { |
1da177e4 LT |
283 | ++result; |
284 | break; | |
285 | } | |
286 | } | |
287 | } | |
288 | break; | |
289 | case AUDIT_DEVMINOR: | |
f368c07d AG |
290 | if (name) |
291 | result = audit_comparator(MINOR(name->dev), | |
292 | f->op, f->val); | |
293 | else if (ctx) { | |
1da177e4 | 294 | for (j = 0; j < ctx->name_count; j++) { |
93315ed6 | 295 | if (audit_comparator(MINOR(ctx->names[j].dev), f->op, f->val)) { |
1da177e4 LT |
296 | ++result; |
297 | break; | |
298 | } | |
299 | } | |
300 | } | |
301 | break; | |
302 | case AUDIT_INODE: | |
f368c07d | 303 | if (name) |
9c937dcc | 304 | result = (name->ino == f->val); |
f368c07d | 305 | else if (ctx) { |
1da177e4 | 306 | for (j = 0; j < ctx->name_count; j++) { |
9c937dcc | 307 | if (audit_comparator(ctx->names[j].ino, f->op, f->val)) { |
1da177e4 LT |
308 | ++result; |
309 | break; | |
310 | } | |
311 | } | |
312 | } | |
313 | break; | |
f368c07d AG |
314 | case AUDIT_WATCH: |
315 | if (name && rule->watch->ino != (unsigned long)-1) | |
316 | result = (name->dev == rule->watch->dev && | |
9c937dcc | 317 | name->ino == rule->watch->ino); |
f368c07d | 318 | break; |
1da177e4 LT |
319 | case AUDIT_LOGINUID: |
320 | result = 0; | |
321 | if (ctx) | |
93315ed6 | 322 | result = audit_comparator(ctx->loginuid, f->op, f->val); |
1da177e4 | 323 | break; |
3a6b9f85 DG |
324 | case AUDIT_SUBJ_USER: |
325 | case AUDIT_SUBJ_ROLE: | |
326 | case AUDIT_SUBJ_TYPE: | |
327 | case AUDIT_SUBJ_SEN: | |
328 | case AUDIT_SUBJ_CLR: | |
3dc7e315 DG |
329 | /* NOTE: this may return negative values indicating |
330 | a temporary error. We simply treat this as a | |
331 | match for now to avoid losing information that | |
332 | may be wanted. An error message will also be | |
333 | logged upon error */ | |
2ad312d2 SG |
334 | if (f->se_rule) { |
335 | if (need_sid) { | |
336 | selinux_task_ctxid(tsk, &sid); | |
337 | need_sid = 0; | |
338 | } | |
3dc7e315 DG |
339 | result = selinux_audit_rule_match(sid, f->type, |
340 | f->op, | |
341 | f->se_rule, | |
342 | ctx); | |
2ad312d2 | 343 | } |
3dc7e315 | 344 | break; |
1da177e4 LT |
345 | case AUDIT_ARG0: |
346 | case AUDIT_ARG1: | |
347 | case AUDIT_ARG2: | |
348 | case AUDIT_ARG3: | |
349 | if (ctx) | |
93315ed6 | 350 | result = audit_comparator(ctx->argv[f->type-AUDIT_ARG0], f->op, f->val); |
1da177e4 | 351 | break; |
5adc8a6a AG |
352 | case AUDIT_FILTERKEY: |
353 | /* ignore this field for filtering */ | |
354 | result = 1; | |
355 | break; | |
1da177e4 LT |
356 | } |
357 | ||
1da177e4 LT |
358 | if (!result) |
359 | return 0; | |
360 | } | |
5adc8a6a AG |
361 | if (rule->filterkey) |
362 | ctx->filterkey = kstrdup(rule->filterkey, GFP_ATOMIC); | |
1da177e4 LT |
363 | switch (rule->action) { |
364 | case AUDIT_NEVER: *state = AUDIT_DISABLED; break; | |
1da177e4 LT |
365 | case AUDIT_ALWAYS: *state = AUDIT_RECORD_CONTEXT; break; |
366 | } | |
367 | return 1; | |
368 | } | |
369 | ||
370 | /* At process creation time, we can determine if system-call auditing is | |
371 | * completely disabled for this task. Since we only have the task | |
372 | * structure at this point, we can only check uid and gid. | |
373 | */ | |
374 | static enum audit_state audit_filter_task(struct task_struct *tsk) | |
375 | { | |
376 | struct audit_entry *e; | |
377 | enum audit_state state; | |
378 | ||
379 | rcu_read_lock(); | |
0f45aa18 | 380 | list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_TASK], list) { |
f368c07d | 381 | if (audit_filter_rules(tsk, &e->rule, NULL, NULL, &state)) { |
1da177e4 LT |
382 | rcu_read_unlock(); |
383 | return state; | |
384 | } | |
385 | } | |
386 | rcu_read_unlock(); | |
387 | return AUDIT_BUILD_CONTEXT; | |
388 | } | |
389 | ||
390 | /* At syscall entry and exit time, this filter is called if the | |
391 | * audit_state is not low enough that auditing cannot take place, but is | |
23f32d18 | 392 | * also not high enough that we already know we have to write an audit |
b0dd25a8 | 393 | * record (i.e., the state is AUDIT_SETUP_CONTEXT or AUDIT_BUILD_CONTEXT). |
1da177e4 LT |
394 | */ |
395 | static enum audit_state audit_filter_syscall(struct task_struct *tsk, | |
396 | struct audit_context *ctx, | |
397 | struct list_head *list) | |
398 | { | |
399 | struct audit_entry *e; | |
c3896495 | 400 | enum audit_state state; |
1da177e4 | 401 | |
351bb722 | 402 | if (audit_pid && tsk->tgid == audit_pid) |
f7056d64 DW |
403 | return AUDIT_DISABLED; |
404 | ||
1da177e4 | 405 | rcu_read_lock(); |
c3896495 | 406 | if (!list_empty(list)) { |
b63862f4 DK |
407 | int word = AUDIT_WORD(ctx->major); |
408 | int bit = AUDIT_BIT(ctx->major); | |
409 | ||
410 | list_for_each_entry_rcu(e, list, list) { | |
f368c07d AG |
411 | if ((e->rule.mask[word] & bit) == bit && |
412 | audit_filter_rules(tsk, &e->rule, ctx, NULL, | |
413 | &state)) { | |
414 | rcu_read_unlock(); | |
415 | return state; | |
416 | } | |
417 | } | |
418 | } | |
419 | rcu_read_unlock(); | |
420 | return AUDIT_BUILD_CONTEXT; | |
421 | } | |
422 | ||
423 | /* At syscall exit time, this filter is called if any audit_names[] have been | |
424 | * collected during syscall processing. We only check rules in sublists at hash | |
425 | * buckets applicable to the inode numbers in audit_names[]. | |
426 | * Regarding audit_state, same rules apply as for audit_filter_syscall(). | |
427 | */ | |
428 | enum audit_state audit_filter_inodes(struct task_struct *tsk, | |
429 | struct audit_context *ctx) | |
430 | { | |
431 | int i; | |
432 | struct audit_entry *e; | |
433 | enum audit_state state; | |
434 | ||
435 | if (audit_pid && tsk->tgid == audit_pid) | |
436 | return AUDIT_DISABLED; | |
437 | ||
438 | rcu_read_lock(); | |
439 | for (i = 0; i < ctx->name_count; i++) { | |
440 | int word = AUDIT_WORD(ctx->major); | |
441 | int bit = AUDIT_BIT(ctx->major); | |
442 | struct audit_names *n = &ctx->names[i]; | |
443 | int h = audit_hash_ino((u32)n->ino); | |
444 | struct list_head *list = &audit_inode_hash[h]; | |
445 | ||
446 | if (list_empty(list)) | |
447 | continue; | |
448 | ||
449 | list_for_each_entry_rcu(e, list, list) { | |
450 | if ((e->rule.mask[word] & bit) == bit && | |
451 | audit_filter_rules(tsk, &e->rule, ctx, n, &state)) { | |
b63862f4 DK |
452 | rcu_read_unlock(); |
453 | return state; | |
454 | } | |
0f45aa18 DW |
455 | } |
456 | } | |
457 | rcu_read_unlock(); | |
1da177e4 | 458 | return AUDIT_BUILD_CONTEXT; |
0f45aa18 DW |
459 | } |
460 | ||
f368c07d AG |
461 | void audit_set_auditable(struct audit_context *ctx) |
462 | { | |
463 | ctx->auditable = 1; | |
464 | } | |
465 | ||
1da177e4 LT |
466 | static inline struct audit_context *audit_get_context(struct task_struct *tsk, |
467 | int return_valid, | |
468 | int return_code) | |
469 | { | |
470 | struct audit_context *context = tsk->audit_context; | |
471 | ||
472 | if (likely(!context)) | |
473 | return NULL; | |
474 | context->return_valid = return_valid; | |
475 | context->return_code = return_code; | |
476 | ||
21af6c4f | 477 | if (context->in_syscall && !context->auditable) { |
1da177e4 | 478 | enum audit_state state; |
f368c07d | 479 | |
0f45aa18 | 480 | state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_EXIT]); |
f368c07d AG |
481 | if (state == AUDIT_RECORD_CONTEXT) { |
482 | context->auditable = 1; | |
483 | goto get_context; | |
484 | } | |
485 | ||
486 | state = audit_filter_inodes(tsk, context); | |
1da177e4 LT |
487 | if (state == AUDIT_RECORD_CONTEXT) |
488 | context->auditable = 1; | |
f368c07d | 489 | |
1da177e4 LT |
490 | } |
491 | ||
f368c07d | 492 | get_context: |
1da177e4 | 493 | context->pid = tsk->pid; |
f46038ff | 494 | context->ppid = sys_getppid(); /* sic. tsk == current in all cases */ |
1da177e4 LT |
495 | context->uid = tsk->uid; |
496 | context->gid = tsk->gid; | |
497 | context->euid = tsk->euid; | |
498 | context->suid = tsk->suid; | |
499 | context->fsuid = tsk->fsuid; | |
500 | context->egid = tsk->egid; | |
501 | context->sgid = tsk->sgid; | |
502 | context->fsgid = tsk->fsgid; | |
503 | context->personality = tsk->personality; | |
504 | tsk->audit_context = NULL; | |
505 | return context; | |
506 | } | |
507 | ||
508 | static inline void audit_free_names(struct audit_context *context) | |
509 | { | |
510 | int i; | |
511 | ||
512 | #if AUDIT_DEBUG == 2 | |
513 | if (context->auditable | |
514 | ||context->put_count + context->ino_count != context->name_count) { | |
73241ccc | 515 | printk(KERN_ERR "%s:%d(:%d): major=%d in_syscall=%d" |
1da177e4 LT |
516 | " name_count=%d put_count=%d" |
517 | " ino_count=%d [NOT freeing]\n", | |
73241ccc | 518 | __FILE__, __LINE__, |
1da177e4 LT |
519 | context->serial, context->major, context->in_syscall, |
520 | context->name_count, context->put_count, | |
521 | context->ino_count); | |
8c8570fb | 522 | for (i = 0; i < context->name_count; i++) { |
1da177e4 LT |
523 | printk(KERN_ERR "names[%d] = %p = %s\n", i, |
524 | context->names[i].name, | |
73241ccc | 525 | context->names[i].name ?: "(null)"); |
8c8570fb | 526 | } |
1da177e4 LT |
527 | dump_stack(); |
528 | return; | |
529 | } | |
530 | #endif | |
531 | #if AUDIT_DEBUG | |
532 | context->put_count = 0; | |
533 | context->ino_count = 0; | |
534 | #endif | |
535 | ||
8c8570fb | 536 | for (i = 0; i < context->name_count; i++) { |
9c937dcc | 537 | if (context->names[i].name && context->names[i].name_put) |
1da177e4 | 538 | __putname(context->names[i].name); |
8c8570fb | 539 | } |
1da177e4 | 540 | context->name_count = 0; |
8f37d47c DW |
541 | if (context->pwd) |
542 | dput(context->pwd); | |
543 | if (context->pwdmnt) | |
544 | mntput(context->pwdmnt); | |
545 | context->pwd = NULL; | |
546 | context->pwdmnt = NULL; | |
1da177e4 LT |
547 | } |
548 | ||
549 | static inline void audit_free_aux(struct audit_context *context) | |
550 | { | |
551 | struct audit_aux_data *aux; | |
552 | ||
553 | while ((aux = context->aux)) { | |
01116105 SS |
554 | if (aux->type == AUDIT_AVC_PATH) { |
555 | struct audit_aux_data_path *axi = (void *)aux; | |
556 | dput(axi->dentry); | |
557 | mntput(axi->mnt); | |
558 | } | |
8c8570fb | 559 | |
1da177e4 LT |
560 | context->aux = aux->next; |
561 | kfree(aux); | |
562 | } | |
563 | } | |
564 | ||
565 | static inline void audit_zero_context(struct audit_context *context, | |
566 | enum audit_state state) | |
567 | { | |
568 | uid_t loginuid = context->loginuid; | |
569 | ||
570 | memset(context, 0, sizeof(*context)); | |
571 | context->state = state; | |
572 | context->loginuid = loginuid; | |
573 | } | |
574 | ||
575 | static inline struct audit_context *audit_alloc_context(enum audit_state state) | |
576 | { | |
577 | struct audit_context *context; | |
578 | ||
579 | if (!(context = kmalloc(sizeof(*context), GFP_KERNEL))) | |
580 | return NULL; | |
581 | audit_zero_context(context, state); | |
582 | return context; | |
583 | } | |
584 | ||
b0dd25a8 RD |
585 | /** |
586 | * audit_alloc - allocate an audit context block for a task | |
587 | * @tsk: task | |
588 | * | |
589 | * Filter on the task information and allocate a per-task audit context | |
1da177e4 LT |
590 | * if necessary. Doing so turns on system call auditing for the |
591 | * specified task. This is called from copy_process, so no lock is | |
b0dd25a8 RD |
592 | * needed. |
593 | */ | |
1da177e4 LT |
594 | int audit_alloc(struct task_struct *tsk) |
595 | { | |
596 | struct audit_context *context; | |
597 | enum audit_state state; | |
598 | ||
599 | if (likely(!audit_enabled)) | |
600 | return 0; /* Return if not auditing. */ | |
601 | ||
602 | state = audit_filter_task(tsk); | |
603 | if (likely(state == AUDIT_DISABLED)) | |
604 | return 0; | |
605 | ||
606 | if (!(context = audit_alloc_context(state))) { | |
607 | audit_log_lost("out of memory in audit_alloc"); | |
608 | return -ENOMEM; | |
609 | } | |
610 | ||
611 | /* Preserve login uid */ | |
612 | context->loginuid = -1; | |
613 | if (current->audit_context) | |
614 | context->loginuid = current->audit_context->loginuid; | |
615 | ||
616 | tsk->audit_context = context; | |
617 | set_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT); | |
618 | return 0; | |
619 | } | |
620 | ||
621 | static inline void audit_free_context(struct audit_context *context) | |
622 | { | |
623 | struct audit_context *previous; | |
624 | int count = 0; | |
625 | ||
626 | do { | |
627 | previous = context->previous; | |
628 | if (previous || (count && count < 10)) { | |
629 | ++count; | |
630 | printk(KERN_ERR "audit(:%d): major=%d name_count=%d:" | |
631 | " freeing multiple contexts (%d)\n", | |
632 | context->serial, context->major, | |
633 | context->name_count, count); | |
634 | } | |
635 | audit_free_names(context); | |
636 | audit_free_aux(context); | |
5adc8a6a | 637 | kfree(context->filterkey); |
1da177e4 LT |
638 | kfree(context); |
639 | context = previous; | |
640 | } while (context); | |
641 | if (count >= 10) | |
642 | printk(KERN_ERR "audit: freed %d contexts\n", count); | |
643 | } | |
644 | ||
e495149b | 645 | static void audit_log_task_context(struct audit_buffer *ab) |
8c8570fb DK |
646 | { |
647 | char *ctx = NULL; | |
648 | ssize_t len = 0; | |
649 | ||
650 | len = security_getprocattr(current, "current", NULL, 0); | |
651 | if (len < 0) { | |
652 | if (len != -EINVAL) | |
653 | goto error_path; | |
654 | return; | |
655 | } | |
656 | ||
e495149b | 657 | ctx = kmalloc(len, GFP_KERNEL); |
7306a0b9 | 658 | if (!ctx) |
8c8570fb | 659 | goto error_path; |
8c8570fb DK |
660 | |
661 | len = security_getprocattr(current, "current", ctx, len); | |
662 | if (len < 0 ) | |
663 | goto error_path; | |
664 | ||
665 | audit_log_format(ab, " subj=%s", ctx); | |
7306a0b9 | 666 | return; |
8c8570fb DK |
667 | |
668 | error_path: | |
9a66a53f | 669 | kfree(ctx); |
7306a0b9 | 670 | audit_panic("error in audit_log_task_context"); |
8c8570fb DK |
671 | return; |
672 | } | |
673 | ||
e495149b | 674 | static void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk) |
219f0817 | 675 | { |
45d9bb0e AV |
676 | char name[sizeof(tsk->comm)]; |
677 | struct mm_struct *mm = tsk->mm; | |
219f0817 SS |
678 | struct vm_area_struct *vma; |
679 | ||
e495149b AV |
680 | /* tsk == current */ |
681 | ||
45d9bb0e | 682 | get_task_comm(name, tsk); |
99e45eea DW |
683 | audit_log_format(ab, " comm="); |
684 | audit_log_untrustedstring(ab, name); | |
219f0817 | 685 | |
e495149b AV |
686 | if (mm) { |
687 | down_read(&mm->mmap_sem); | |
688 | vma = mm->mmap; | |
689 | while (vma) { | |
690 | if ((vma->vm_flags & VM_EXECUTABLE) && | |
691 | vma->vm_file) { | |
692 | audit_log_d_path(ab, "exe=", | |
693 | vma->vm_file->f_dentry, | |
694 | vma->vm_file->f_vfsmnt); | |
695 | break; | |
696 | } | |
697 | vma = vma->vm_next; | |
219f0817 | 698 | } |
e495149b | 699 | up_read(&mm->mmap_sem); |
219f0817 | 700 | } |
e495149b | 701 | audit_log_task_context(ab); |
219f0817 SS |
702 | } |
703 | ||
e495149b | 704 | static void audit_log_exit(struct audit_context *context, struct task_struct *tsk) |
1da177e4 | 705 | { |
9c7aa6aa | 706 | int i, call_panic = 0; |
1da177e4 | 707 | struct audit_buffer *ab; |
7551ced3 | 708 | struct audit_aux_data *aux; |
a6c043a8 | 709 | const char *tty; |
1da177e4 | 710 | |
e495149b AV |
711 | /* tsk == current */ |
712 | ||
713 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_SYSCALL); | |
1da177e4 LT |
714 | if (!ab) |
715 | return; /* audit_panic has been called */ | |
bccf6ae0 DW |
716 | audit_log_format(ab, "arch=%x syscall=%d", |
717 | context->arch, context->major); | |
1da177e4 LT |
718 | if (context->personality != PER_LINUX) |
719 | audit_log_format(ab, " per=%lx", context->personality); | |
720 | if (context->return_valid) | |
2fd6f58b | 721 | audit_log_format(ab, " success=%s exit=%ld", |
722 | (context->return_valid==AUDITSC_SUCCESS)?"yes":"no", | |
723 | context->return_code); | |
45d9bb0e AV |
724 | if (tsk->signal && tsk->signal->tty && tsk->signal->tty->name) |
725 | tty = tsk->signal->tty->name; | |
a6c043a8 SG |
726 | else |
727 | tty = "(none)"; | |
1da177e4 LT |
728 | audit_log_format(ab, |
729 | " a0=%lx a1=%lx a2=%lx a3=%lx items=%d" | |
f46038ff | 730 | " ppid=%d pid=%d auid=%u uid=%u gid=%u" |
326e9c8b | 731 | " euid=%u suid=%u fsuid=%u" |
a6c043a8 | 732 | " egid=%u sgid=%u fsgid=%u tty=%s", |
1da177e4 LT |
733 | context->argv[0], |
734 | context->argv[1], | |
735 | context->argv[2], | |
736 | context->argv[3], | |
737 | context->name_count, | |
f46038ff | 738 | context->ppid, |
1da177e4 LT |
739 | context->pid, |
740 | context->loginuid, | |
741 | context->uid, | |
742 | context->gid, | |
743 | context->euid, context->suid, context->fsuid, | |
a6c043a8 | 744 | context->egid, context->sgid, context->fsgid, tty); |
e495149b | 745 | audit_log_task_info(ab, tsk); |
5adc8a6a AG |
746 | if (context->filterkey) { |
747 | audit_log_format(ab, " key="); | |
748 | audit_log_untrustedstring(ab, context->filterkey); | |
749 | } else | |
750 | audit_log_format(ab, " key=(null)"); | |
1da177e4 | 751 | audit_log_end(ab); |
1da177e4 | 752 | |
7551ced3 | 753 | for (aux = context->aux; aux; aux = aux->next) { |
c0404993 | 754 | |
e495149b | 755 | ab = audit_log_start(context, GFP_KERNEL, aux->type); |
1da177e4 LT |
756 | if (!ab) |
757 | continue; /* audit_panic has been called */ | |
758 | ||
1da177e4 | 759 | switch (aux->type) { |
20ca73bc GW |
760 | case AUDIT_MQ_OPEN: { |
761 | struct audit_aux_data_mq_open *axi = (void *)aux; | |
762 | audit_log_format(ab, | |
763 | "oflag=0x%x mode=%#o mq_flags=0x%lx mq_maxmsg=%ld " | |
764 | "mq_msgsize=%ld mq_curmsgs=%ld", | |
765 | axi->oflag, axi->mode, axi->attr.mq_flags, | |
766 | axi->attr.mq_maxmsg, axi->attr.mq_msgsize, | |
767 | axi->attr.mq_curmsgs); | |
768 | break; } | |
769 | ||
770 | case AUDIT_MQ_SENDRECV: { | |
771 | struct audit_aux_data_mq_sendrecv *axi = (void *)aux; | |
772 | audit_log_format(ab, | |
773 | "mqdes=%d msg_len=%zd msg_prio=%u " | |
774 | "abs_timeout_sec=%ld abs_timeout_nsec=%ld", | |
775 | axi->mqdes, axi->msg_len, axi->msg_prio, | |
776 | axi->abs_timeout.tv_sec, axi->abs_timeout.tv_nsec); | |
777 | break; } | |
778 | ||
779 | case AUDIT_MQ_NOTIFY: { | |
780 | struct audit_aux_data_mq_notify *axi = (void *)aux; | |
781 | audit_log_format(ab, | |
782 | "mqdes=%d sigev_signo=%d", | |
783 | axi->mqdes, | |
784 | axi->notification.sigev_signo); | |
785 | break; } | |
786 | ||
787 | case AUDIT_MQ_GETSETATTR: { | |
788 | struct audit_aux_data_mq_getsetattr *axi = (void *)aux; | |
789 | audit_log_format(ab, | |
790 | "mqdes=%d mq_flags=0x%lx mq_maxmsg=%ld mq_msgsize=%ld " | |
791 | "mq_curmsgs=%ld ", | |
792 | axi->mqdes, | |
793 | axi->mqstat.mq_flags, axi->mqstat.mq_maxmsg, | |
794 | axi->mqstat.mq_msgsize, axi->mqstat.mq_curmsgs); | |
795 | break; } | |
796 | ||
c0404993 | 797 | case AUDIT_IPC: { |
1da177e4 LT |
798 | struct audit_aux_data_ipcctl *axi = (void *)aux; |
799 | audit_log_format(ab, | |
ac03221a LK |
800 | "ouid=%u ogid=%u mode=%x", |
801 | axi->uid, axi->gid, axi->mode); | |
9c7aa6aa SG |
802 | if (axi->osid != 0) { |
803 | char *ctx = NULL; | |
804 | u32 len; | |
805 | if (selinux_ctxid_to_string( | |
806 | axi->osid, &ctx, &len)) { | |
ce29b682 | 807 | audit_log_format(ab, " osid=%u", |
9c7aa6aa SG |
808 | axi->osid); |
809 | call_panic = 1; | |
810 | } else | |
811 | audit_log_format(ab, " obj=%s", ctx); | |
812 | kfree(ctx); | |
813 | } | |
3ec3b2fb DW |
814 | break; } |
815 | ||
073115d6 SG |
816 | case AUDIT_IPC_SET_PERM: { |
817 | struct audit_aux_data_ipcctl *axi = (void *)aux; | |
818 | audit_log_format(ab, | |
ac03221a | 819 | "qbytes=%lx ouid=%u ogid=%u mode=%x", |
073115d6 | 820 | axi->qbytes, axi->uid, axi->gid, axi->mode); |
073115d6 | 821 | break; } |
ac03221a | 822 | |
473ae30b AV |
823 | case AUDIT_EXECVE: { |
824 | struct audit_aux_data_execve *axi = (void *)aux; | |
825 | int i; | |
826 | const char *p; | |
827 | for (i = 0, p = axi->mem; i < axi->argc; i++) { | |
828 | audit_log_format(ab, "a%d=", i); | |
829 | p = audit_log_untrustedstring(ab, p); | |
830 | audit_log_format(ab, "\n"); | |
831 | } | |
832 | break; } | |
073115d6 | 833 | |
3ec3b2fb DW |
834 | case AUDIT_SOCKETCALL: { |
835 | int i; | |
836 | struct audit_aux_data_socketcall *axs = (void *)aux; | |
837 | audit_log_format(ab, "nargs=%d", axs->nargs); | |
838 | for (i=0; i<axs->nargs; i++) | |
839 | audit_log_format(ab, " a%d=%lx", i, axs->args[i]); | |
840 | break; } | |
841 | ||
842 | case AUDIT_SOCKADDR: { | |
843 | struct audit_aux_data_sockaddr *axs = (void *)aux; | |
844 | ||
845 | audit_log_format(ab, "saddr="); | |
846 | audit_log_hex(ab, axs->a, axs->len); | |
847 | break; } | |
01116105 SS |
848 | |
849 | case AUDIT_AVC_PATH: { | |
850 | struct audit_aux_data_path *axi = (void *)aux; | |
851 | audit_log_d_path(ab, "path=", axi->dentry, axi->mnt); | |
01116105 SS |
852 | break; } |
853 | ||
1da177e4 LT |
854 | } |
855 | audit_log_end(ab); | |
1da177e4 LT |
856 | } |
857 | ||
8f37d47c | 858 | if (context->pwd && context->pwdmnt) { |
e495149b | 859 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD); |
8f37d47c DW |
860 | if (ab) { |
861 | audit_log_d_path(ab, "cwd=", context->pwd, context->pwdmnt); | |
862 | audit_log_end(ab); | |
863 | } | |
864 | } | |
1da177e4 | 865 | for (i = 0; i < context->name_count; i++) { |
9c937dcc | 866 | struct audit_names *n = &context->names[i]; |
73241ccc | 867 | |
e495149b | 868 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_PATH); |
1da177e4 LT |
869 | if (!ab) |
870 | continue; /* audit_panic has been called */ | |
8f37d47c | 871 | |
1da177e4 | 872 | audit_log_format(ab, "item=%d", i); |
73241ccc | 873 | |
9c937dcc AG |
874 | if (n->name) { |
875 | switch(n->name_len) { | |
876 | case AUDIT_NAME_FULL: | |
877 | /* log the full path */ | |
878 | audit_log_format(ab, " name="); | |
879 | audit_log_untrustedstring(ab, n->name); | |
880 | break; | |
881 | case 0: | |
882 | /* name was specified as a relative path and the | |
883 | * directory component is the cwd */ | |
884 | audit_log_d_path(ab, " name=", context->pwd, | |
885 | context->pwdmnt); | |
886 | break; | |
887 | default: | |
888 | /* log the name's directory component */ | |
889 | audit_log_format(ab, " name="); | |
890 | audit_log_n_untrustedstring(ab, n->name_len, | |
891 | n->name); | |
892 | } | |
893 | } else | |
894 | audit_log_format(ab, " name=(null)"); | |
895 | ||
896 | if (n->ino != (unsigned long)-1) { | |
897 | audit_log_format(ab, " inode=%lu" | |
898 | " dev=%02x:%02x mode=%#o" | |
899 | " ouid=%u ogid=%u rdev=%02x:%02x", | |
900 | n->ino, | |
901 | MAJOR(n->dev), | |
902 | MINOR(n->dev), | |
903 | n->mode, | |
904 | n->uid, | |
905 | n->gid, | |
906 | MAJOR(n->rdev), | |
907 | MINOR(n->rdev)); | |
908 | } | |
909 | if (n->osid != 0) { | |
1b50eed9 SG |
910 | char *ctx = NULL; |
911 | u32 len; | |
912 | if (selinux_ctxid_to_string( | |
9c937dcc AG |
913 | n->osid, &ctx, &len)) { |
914 | audit_log_format(ab, " osid=%u", n->osid); | |
9c7aa6aa | 915 | call_panic = 2; |
1b50eed9 SG |
916 | } else |
917 | audit_log_format(ab, " obj=%s", ctx); | |
918 | kfree(ctx); | |
8c8570fb DK |
919 | } |
920 | ||
1da177e4 LT |
921 | audit_log_end(ab); |
922 | } | |
9c7aa6aa SG |
923 | if (call_panic) |
924 | audit_panic("error converting sid to string"); | |
1da177e4 LT |
925 | } |
926 | ||
b0dd25a8 RD |
927 | /** |
928 | * audit_free - free a per-task audit context | |
929 | * @tsk: task whose audit context block to free | |
930 | * | |
fa84cb93 | 931 | * Called from copy_process and do_exit |
b0dd25a8 | 932 | */ |
1da177e4 LT |
933 | void audit_free(struct task_struct *tsk) |
934 | { | |
935 | struct audit_context *context; | |
936 | ||
1da177e4 | 937 | context = audit_get_context(tsk, 0, 0); |
1da177e4 LT |
938 | if (likely(!context)) |
939 | return; | |
940 | ||
941 | /* Check for system calls that do not go through the exit | |
f5561964 DW |
942 | * function (e.g., exit_group), then free context block. |
943 | * We use GFP_ATOMIC here because we might be doing this | |
944 | * in the context of the idle thread */ | |
e495149b | 945 | /* that can happen only if we are called from do_exit() */ |
f7056d64 | 946 | if (context->in_syscall && context->auditable) |
e495149b | 947 | audit_log_exit(context, tsk); |
1da177e4 LT |
948 | |
949 | audit_free_context(context); | |
950 | } | |
951 | ||
b0dd25a8 RD |
952 | /** |
953 | * audit_syscall_entry - fill in an audit record at syscall entry | |
954 | * @tsk: task being audited | |
955 | * @arch: architecture type | |
956 | * @major: major syscall type (function) | |
957 | * @a1: additional syscall register 1 | |
958 | * @a2: additional syscall register 2 | |
959 | * @a3: additional syscall register 3 | |
960 | * @a4: additional syscall register 4 | |
961 | * | |
962 | * Fill in audit context at syscall entry. This only happens if the | |
1da177e4 LT |
963 | * audit context was created when the task was created and the state or |
964 | * filters demand the audit context be built. If the state from the | |
965 | * per-task filter or from the per-syscall filter is AUDIT_RECORD_CONTEXT, | |
966 | * then the record will be written at syscall exit time (otherwise, it | |
967 | * will only be written if another part of the kernel requests that it | |
b0dd25a8 RD |
968 | * be written). |
969 | */ | |
5411be59 | 970 | void audit_syscall_entry(int arch, int major, |
1da177e4 LT |
971 | unsigned long a1, unsigned long a2, |
972 | unsigned long a3, unsigned long a4) | |
973 | { | |
5411be59 | 974 | struct task_struct *tsk = current; |
1da177e4 LT |
975 | struct audit_context *context = tsk->audit_context; |
976 | enum audit_state state; | |
977 | ||
978 | BUG_ON(!context); | |
979 | ||
b0dd25a8 RD |
980 | /* |
981 | * This happens only on certain architectures that make system | |
1da177e4 LT |
982 | * calls in kernel_thread via the entry.S interface, instead of |
983 | * with direct calls. (If you are porting to a new | |
984 | * architecture, hitting this condition can indicate that you | |
985 | * got the _exit/_leave calls backward in entry.S.) | |
986 | * | |
987 | * i386 no | |
988 | * x86_64 no | |
2ef9481e | 989 | * ppc64 yes (see arch/powerpc/platforms/iseries/misc.S) |
1da177e4 LT |
990 | * |
991 | * This also happens with vm86 emulation in a non-nested manner | |
992 | * (entries without exits), so this case must be caught. | |
993 | */ | |
994 | if (context->in_syscall) { | |
995 | struct audit_context *newctx; | |
996 | ||
1da177e4 LT |
997 | #if AUDIT_DEBUG |
998 | printk(KERN_ERR | |
999 | "audit(:%d) pid=%d in syscall=%d;" | |
1000 | " entering syscall=%d\n", | |
1001 | context->serial, tsk->pid, context->major, major); | |
1002 | #endif | |
1003 | newctx = audit_alloc_context(context->state); | |
1004 | if (newctx) { | |
1005 | newctx->previous = context; | |
1006 | context = newctx; | |
1007 | tsk->audit_context = newctx; | |
1008 | } else { | |
1009 | /* If we can't alloc a new context, the best we | |
1010 | * can do is to leak memory (any pending putname | |
1011 | * will be lost). The only other alternative is | |
1012 | * to abandon auditing. */ | |
1013 | audit_zero_context(context, context->state); | |
1014 | } | |
1015 | } | |
1016 | BUG_ON(context->in_syscall || context->name_count); | |
1017 | ||
1018 | if (!audit_enabled) | |
1019 | return; | |
1020 | ||
2fd6f58b | 1021 | context->arch = arch; |
1da177e4 LT |
1022 | context->major = major; |
1023 | context->argv[0] = a1; | |
1024 | context->argv[1] = a2; | |
1025 | context->argv[2] = a3; | |
1026 | context->argv[3] = a4; | |
1027 | ||
1028 | state = context->state; | |
1029 | if (state == AUDIT_SETUP_CONTEXT || state == AUDIT_BUILD_CONTEXT) | |
0f45aa18 | 1030 | state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_ENTRY]); |
1da177e4 LT |
1031 | if (likely(state == AUDIT_DISABLED)) |
1032 | return; | |
1033 | ||
ce625a80 | 1034 | context->serial = 0; |
1da177e4 LT |
1035 | context->ctime = CURRENT_TIME; |
1036 | context->in_syscall = 1; | |
1037 | context->auditable = !!(state == AUDIT_RECORD_CONTEXT); | |
1038 | } | |
1039 | ||
b0dd25a8 RD |
1040 | /** |
1041 | * audit_syscall_exit - deallocate audit context after a system call | |
1042 | * @tsk: task being audited | |
1043 | * @valid: success/failure flag | |
1044 | * @return_code: syscall return value | |
1045 | * | |
1046 | * Tear down after system call. If the audit context has been marked as | |
1da177e4 LT |
1047 | * auditable (either because of the AUDIT_RECORD_CONTEXT state from |
1048 | * filtering, or because some other part of the kernel write an audit | |
1049 | * message), then write out the syscall information. In call cases, | |
b0dd25a8 RD |
1050 | * free the names stored from getname(). |
1051 | */ | |
5411be59 | 1052 | void audit_syscall_exit(int valid, long return_code) |
1da177e4 | 1053 | { |
5411be59 | 1054 | struct task_struct *tsk = current; |
1da177e4 LT |
1055 | struct audit_context *context; |
1056 | ||
2fd6f58b | 1057 | context = audit_get_context(tsk, valid, return_code); |
1da177e4 | 1058 | |
1da177e4 | 1059 | if (likely(!context)) |
97e94c45 | 1060 | return; |
1da177e4 | 1061 | |
f7056d64 | 1062 | if (context->in_syscall && context->auditable) |
e495149b | 1063 | audit_log_exit(context, tsk); |
1da177e4 LT |
1064 | |
1065 | context->in_syscall = 0; | |
1066 | context->auditable = 0; | |
2fd6f58b | 1067 | |
1da177e4 LT |
1068 | if (context->previous) { |
1069 | struct audit_context *new_context = context->previous; | |
1070 | context->previous = NULL; | |
1071 | audit_free_context(context); | |
1072 | tsk->audit_context = new_context; | |
1073 | } else { | |
1074 | audit_free_names(context); | |
1075 | audit_free_aux(context); | |
5adc8a6a AG |
1076 | kfree(context->filterkey); |
1077 | context->filterkey = NULL; | |
1da177e4 LT |
1078 | tsk->audit_context = context; |
1079 | } | |
1da177e4 LT |
1080 | } |
1081 | ||
b0dd25a8 RD |
1082 | /** |
1083 | * audit_getname - add a name to the list | |
1084 | * @name: name to add | |
1085 | * | |
1086 | * Add a name to the list of audit names for this context. | |
1087 | * Called from fs/namei.c:getname(). | |
1088 | */ | |
d8945bb5 | 1089 | void __audit_getname(const char *name) |
1da177e4 LT |
1090 | { |
1091 | struct audit_context *context = current->audit_context; | |
1092 | ||
d8945bb5 | 1093 | if (IS_ERR(name) || !name) |
1da177e4 LT |
1094 | return; |
1095 | ||
1096 | if (!context->in_syscall) { | |
1097 | #if AUDIT_DEBUG == 2 | |
1098 | printk(KERN_ERR "%s:%d(:%d): ignoring getname(%p)\n", | |
1099 | __FILE__, __LINE__, context->serial, name); | |
1100 | dump_stack(); | |
1101 | #endif | |
1102 | return; | |
1103 | } | |
1104 | BUG_ON(context->name_count >= AUDIT_NAMES); | |
1105 | context->names[context->name_count].name = name; | |
9c937dcc AG |
1106 | context->names[context->name_count].name_len = AUDIT_NAME_FULL; |
1107 | context->names[context->name_count].name_put = 1; | |
1da177e4 LT |
1108 | context->names[context->name_count].ino = (unsigned long)-1; |
1109 | ++context->name_count; | |
8f37d47c DW |
1110 | if (!context->pwd) { |
1111 | read_lock(¤t->fs->lock); | |
1112 | context->pwd = dget(current->fs->pwd); | |
1113 | context->pwdmnt = mntget(current->fs->pwdmnt); | |
1114 | read_unlock(¤t->fs->lock); | |
1115 | } | |
1116 | ||
1da177e4 LT |
1117 | } |
1118 | ||
b0dd25a8 RD |
1119 | /* audit_putname - intercept a putname request |
1120 | * @name: name to intercept and delay for putname | |
1121 | * | |
1122 | * If we have stored the name from getname in the audit context, | |
1123 | * then we delay the putname until syscall exit. | |
1124 | * Called from include/linux/fs.h:putname(). | |
1125 | */ | |
1da177e4 LT |
1126 | void audit_putname(const char *name) |
1127 | { | |
1128 | struct audit_context *context = current->audit_context; | |
1129 | ||
1130 | BUG_ON(!context); | |
1131 | if (!context->in_syscall) { | |
1132 | #if AUDIT_DEBUG == 2 | |
1133 | printk(KERN_ERR "%s:%d(:%d): __putname(%p)\n", | |
1134 | __FILE__, __LINE__, context->serial, name); | |
1135 | if (context->name_count) { | |
1136 | int i; | |
1137 | for (i = 0; i < context->name_count; i++) | |
1138 | printk(KERN_ERR "name[%d] = %p = %s\n", i, | |
1139 | context->names[i].name, | |
73241ccc | 1140 | context->names[i].name ?: "(null)"); |
1da177e4 LT |
1141 | } |
1142 | #endif | |
1143 | __putname(name); | |
1144 | } | |
1145 | #if AUDIT_DEBUG | |
1146 | else { | |
1147 | ++context->put_count; | |
1148 | if (context->put_count > context->name_count) { | |
1149 | printk(KERN_ERR "%s:%d(:%d): major=%d" | |
1150 | " in_syscall=%d putname(%p) name_count=%d" | |
1151 | " put_count=%d\n", | |
1152 | __FILE__, __LINE__, | |
1153 | context->serial, context->major, | |
1154 | context->in_syscall, name, context->name_count, | |
1155 | context->put_count); | |
1156 | dump_stack(); | |
1157 | } | |
1158 | } | |
1159 | #endif | |
1160 | } | |
1161 | ||
9c7aa6aa | 1162 | static void audit_inode_context(int idx, const struct inode *inode) |
8c8570fb DK |
1163 | { |
1164 | struct audit_context *context = current->audit_context; | |
8c8570fb | 1165 | |
1b50eed9 | 1166 | selinux_get_inode_sid(inode, &context->names[idx].osid); |
8c8570fb DK |
1167 | } |
1168 | ||
1169 | ||
b0dd25a8 RD |
1170 | /** |
1171 | * audit_inode - store the inode and device from a lookup | |
1172 | * @name: name being audited | |
1173 | * @inode: inode being audited | |
b0dd25a8 RD |
1174 | * |
1175 | * Called from fs/namei.c:path_lookup(). | |
1176 | */ | |
9c937dcc | 1177 | void __audit_inode(const char *name, const struct inode *inode) |
1da177e4 LT |
1178 | { |
1179 | int idx; | |
1180 | struct audit_context *context = current->audit_context; | |
1181 | ||
1182 | if (!context->in_syscall) | |
1183 | return; | |
1184 | if (context->name_count | |
1185 | && context->names[context->name_count-1].name | |
1186 | && context->names[context->name_count-1].name == name) | |
1187 | idx = context->name_count - 1; | |
1188 | else if (context->name_count > 1 | |
1189 | && context->names[context->name_count-2].name | |
1190 | && context->names[context->name_count-2].name == name) | |
1191 | idx = context->name_count - 2; | |
1192 | else { | |
1193 | /* FIXME: how much do we care about inodes that have no | |
1194 | * associated name? */ | |
1195 | if (context->name_count >= AUDIT_NAMES - AUDIT_NAMES_RESERVED) | |
1196 | return; | |
1197 | idx = context->name_count++; | |
1198 | context->names[idx].name = NULL; | |
1199 | #if AUDIT_DEBUG | |
1200 | ++context->ino_count; | |
1201 | #endif | |
1202 | } | |
9c937dcc | 1203 | context->names[idx].ino = inode->i_ino; |
ae7b961b DW |
1204 | context->names[idx].dev = inode->i_sb->s_dev; |
1205 | context->names[idx].mode = inode->i_mode; | |
1206 | context->names[idx].uid = inode->i_uid; | |
1207 | context->names[idx].gid = inode->i_gid; | |
1208 | context->names[idx].rdev = inode->i_rdev; | |
8c8570fb | 1209 | audit_inode_context(idx, inode); |
73241ccc AG |
1210 | } |
1211 | ||
1212 | /** | |
1213 | * audit_inode_child - collect inode info for created/removed objects | |
1214 | * @dname: inode's dentry name | |
1215 | * @inode: inode being audited | |
1216 | * @pino: inode number of dentry parent | |
1217 | * | |
1218 | * For syscalls that create or remove filesystem objects, audit_inode | |
1219 | * can only collect information for the filesystem object's parent. | |
1220 | * This call updates the audit context with the child's information. | |
1221 | * Syscalls that create a new filesystem object must be hooked after | |
1222 | * the object is created. Syscalls that remove a filesystem object | |
1223 | * must be hooked prior, in order to capture the target inode during | |
1224 | * unsuccessful attempts. | |
1225 | */ | |
1226 | void __audit_inode_child(const char *dname, const struct inode *inode, | |
1227 | unsigned long pino) | |
1228 | { | |
1229 | int idx; | |
1230 | struct audit_context *context = current->audit_context; | |
9c937dcc AG |
1231 | const char *found_name = NULL; |
1232 | int dirlen = 0; | |
73241ccc AG |
1233 | |
1234 | if (!context->in_syscall) | |
1235 | return; | |
1236 | ||
1237 | /* determine matching parent */ | |
f368c07d | 1238 | if (!dname) |
9c937dcc | 1239 | goto update_context; |
f368c07d | 1240 | for (idx = 0; idx < context->name_count; idx++) |
9c937dcc | 1241 | if (context->names[idx].ino == pino) { |
f368c07d | 1242 | const char *name = context->names[idx].name; |
73241ccc | 1243 | |
f368c07d AG |
1244 | if (!name) |
1245 | continue; | |
1246 | ||
9c937dcc AG |
1247 | if (audit_compare_dname_path(dname, name, &dirlen) == 0) { |
1248 | context->names[idx].name_len = dirlen; | |
1249 | found_name = name; | |
1250 | break; | |
1251 | } | |
f368c07d | 1252 | } |
73241ccc | 1253 | |
9c937dcc | 1254 | update_context: |
73241ccc | 1255 | idx = context->name_count++; |
73241ccc AG |
1256 | #if AUDIT_DEBUG |
1257 | context->ino_count++; | |
1258 | #endif | |
9c937dcc AG |
1259 | /* Re-use the name belonging to the slot for a matching parent directory. |
1260 | * All names for this context are relinquished in audit_free_names() */ | |
1261 | context->names[idx].name = found_name; | |
1262 | context->names[idx].name_len = AUDIT_NAME_FULL; | |
1263 | context->names[idx].name_put = 0; /* don't call __putname() */ | |
73241ccc | 1264 | |
73241ccc AG |
1265 | if (inode) { |
1266 | context->names[idx].ino = inode->i_ino; | |
1267 | context->names[idx].dev = inode->i_sb->s_dev; | |
1268 | context->names[idx].mode = inode->i_mode; | |
1269 | context->names[idx].uid = inode->i_uid; | |
1270 | context->names[idx].gid = inode->i_gid; | |
1271 | context->names[idx].rdev = inode->i_rdev; | |
8c8570fb | 1272 | audit_inode_context(idx, inode); |
9c937dcc AG |
1273 | } else |
1274 | context->names[idx].ino = (unsigned long)-1; | |
1da177e4 LT |
1275 | } |
1276 | ||
b0dd25a8 RD |
1277 | /** |
1278 | * auditsc_get_stamp - get local copies of audit_context values | |
1279 | * @ctx: audit_context for the task | |
1280 | * @t: timespec to store time recorded in the audit_context | |
1281 | * @serial: serial value that is recorded in the audit_context | |
1282 | * | |
1283 | * Also sets the context as auditable. | |
1284 | */ | |
bfb4496e DW |
1285 | void auditsc_get_stamp(struct audit_context *ctx, |
1286 | struct timespec *t, unsigned int *serial) | |
1da177e4 | 1287 | { |
ce625a80 DW |
1288 | if (!ctx->serial) |
1289 | ctx->serial = audit_serial(); | |
bfb4496e DW |
1290 | t->tv_sec = ctx->ctime.tv_sec; |
1291 | t->tv_nsec = ctx->ctime.tv_nsec; | |
1292 | *serial = ctx->serial; | |
1293 | ctx->auditable = 1; | |
1da177e4 LT |
1294 | } |
1295 | ||
b0dd25a8 RD |
1296 | /** |
1297 | * audit_set_loginuid - set a task's audit_context loginuid | |
1298 | * @task: task whose audit context is being modified | |
1299 | * @loginuid: loginuid value | |
1300 | * | |
1301 | * Returns 0. | |
1302 | * | |
1303 | * Called (set) from fs/proc/base.c::proc_loginuid_write(). | |
1304 | */ | |
456be6cd | 1305 | int audit_set_loginuid(struct task_struct *task, uid_t loginuid) |
1da177e4 | 1306 | { |
41757106 SG |
1307 | struct audit_context *context = task->audit_context; |
1308 | ||
1309 | if (context) { | |
1310 | /* Only log if audit is enabled */ | |
1311 | if (context->in_syscall) { | |
1312 | struct audit_buffer *ab; | |
1313 | ||
1314 | ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_LOGIN); | |
1315 | if (ab) { | |
1316 | audit_log_format(ab, "login pid=%d uid=%u " | |
1317 | "old auid=%u new auid=%u", | |
1318 | task->pid, task->uid, | |
1319 | context->loginuid, loginuid); | |
1320 | audit_log_end(ab); | |
1321 | } | |
c0404993 | 1322 | } |
41757106 | 1323 | context->loginuid = loginuid; |
1da177e4 LT |
1324 | } |
1325 | return 0; | |
1326 | } | |
1327 | ||
b0dd25a8 RD |
1328 | /** |
1329 | * audit_get_loginuid - get the loginuid for an audit_context | |
1330 | * @ctx: the audit_context | |
1331 | * | |
1332 | * Returns the context's loginuid or -1 if @ctx is NULL. | |
1333 | */ | |
1da177e4 LT |
1334 | uid_t audit_get_loginuid(struct audit_context *ctx) |
1335 | { | |
1336 | return ctx ? ctx->loginuid : -1; | |
1337 | } | |
1338 | ||
20ca73bc GW |
1339 | /** |
1340 | * __audit_mq_open - record audit data for a POSIX MQ open | |
1341 | * @oflag: open flag | |
1342 | * @mode: mode bits | |
1343 | * @u_attr: queue attributes | |
1344 | * | |
1345 | * Returns 0 for success or NULL context or < 0 on error. | |
1346 | */ | |
1347 | int __audit_mq_open(int oflag, mode_t mode, struct mq_attr __user *u_attr) | |
1348 | { | |
1349 | struct audit_aux_data_mq_open *ax; | |
1350 | struct audit_context *context = current->audit_context; | |
1351 | ||
1352 | if (!audit_enabled) | |
1353 | return 0; | |
1354 | ||
1355 | if (likely(!context)) | |
1356 | return 0; | |
1357 | ||
1358 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1359 | if (!ax) | |
1360 | return -ENOMEM; | |
1361 | ||
1362 | if (u_attr != NULL) { | |
1363 | if (copy_from_user(&ax->attr, u_attr, sizeof(ax->attr))) { | |
1364 | kfree(ax); | |
1365 | return -EFAULT; | |
1366 | } | |
1367 | } else | |
1368 | memset(&ax->attr, 0, sizeof(ax->attr)); | |
1369 | ||
1370 | ax->oflag = oflag; | |
1371 | ax->mode = mode; | |
1372 | ||
1373 | ax->d.type = AUDIT_MQ_OPEN; | |
1374 | ax->d.next = context->aux; | |
1375 | context->aux = (void *)ax; | |
1376 | return 0; | |
1377 | } | |
1378 | ||
1379 | /** | |
1380 | * __audit_mq_timedsend - record audit data for a POSIX MQ timed send | |
1381 | * @mqdes: MQ descriptor | |
1382 | * @msg_len: Message length | |
1383 | * @msg_prio: Message priority | |
1dbe83c3 | 1384 | * @u_abs_timeout: Message timeout in absolute time |
20ca73bc GW |
1385 | * |
1386 | * Returns 0 for success or NULL context or < 0 on error. | |
1387 | */ | |
1388 | int __audit_mq_timedsend(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, | |
1389 | const struct timespec __user *u_abs_timeout) | |
1390 | { | |
1391 | struct audit_aux_data_mq_sendrecv *ax; | |
1392 | struct audit_context *context = current->audit_context; | |
1393 | ||
1394 | if (!audit_enabled) | |
1395 | return 0; | |
1396 | ||
1397 | if (likely(!context)) | |
1398 | return 0; | |
1399 | ||
1400 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1401 | if (!ax) | |
1402 | return -ENOMEM; | |
1403 | ||
1404 | if (u_abs_timeout != NULL) { | |
1405 | if (copy_from_user(&ax->abs_timeout, u_abs_timeout, sizeof(ax->abs_timeout))) { | |
1406 | kfree(ax); | |
1407 | return -EFAULT; | |
1408 | } | |
1409 | } else | |
1410 | memset(&ax->abs_timeout, 0, sizeof(ax->abs_timeout)); | |
1411 | ||
1412 | ax->mqdes = mqdes; | |
1413 | ax->msg_len = msg_len; | |
1414 | ax->msg_prio = msg_prio; | |
1415 | ||
1416 | ax->d.type = AUDIT_MQ_SENDRECV; | |
1417 | ax->d.next = context->aux; | |
1418 | context->aux = (void *)ax; | |
1419 | return 0; | |
1420 | } | |
1421 | ||
1422 | /** | |
1423 | * __audit_mq_timedreceive - record audit data for a POSIX MQ timed receive | |
1424 | * @mqdes: MQ descriptor | |
1425 | * @msg_len: Message length | |
1dbe83c3 RD |
1426 | * @u_msg_prio: Message priority |
1427 | * @u_abs_timeout: Message timeout in absolute time | |
20ca73bc GW |
1428 | * |
1429 | * Returns 0 for success or NULL context or < 0 on error. | |
1430 | */ | |
1431 | int __audit_mq_timedreceive(mqd_t mqdes, size_t msg_len, | |
1432 | unsigned int __user *u_msg_prio, | |
1433 | const struct timespec __user *u_abs_timeout) | |
1434 | { | |
1435 | struct audit_aux_data_mq_sendrecv *ax; | |
1436 | struct audit_context *context = current->audit_context; | |
1437 | ||
1438 | if (!audit_enabled) | |
1439 | return 0; | |
1440 | ||
1441 | if (likely(!context)) | |
1442 | return 0; | |
1443 | ||
1444 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1445 | if (!ax) | |
1446 | return -ENOMEM; | |
1447 | ||
1448 | if (u_msg_prio != NULL) { | |
1449 | if (get_user(ax->msg_prio, u_msg_prio)) { | |
1450 | kfree(ax); | |
1451 | return -EFAULT; | |
1452 | } | |
1453 | } else | |
1454 | ax->msg_prio = 0; | |
1455 | ||
1456 | if (u_abs_timeout != NULL) { | |
1457 | if (copy_from_user(&ax->abs_timeout, u_abs_timeout, sizeof(ax->abs_timeout))) { | |
1458 | kfree(ax); | |
1459 | return -EFAULT; | |
1460 | } | |
1461 | } else | |
1462 | memset(&ax->abs_timeout, 0, sizeof(ax->abs_timeout)); | |
1463 | ||
1464 | ax->mqdes = mqdes; | |
1465 | ax->msg_len = msg_len; | |
1466 | ||
1467 | ax->d.type = AUDIT_MQ_SENDRECV; | |
1468 | ax->d.next = context->aux; | |
1469 | context->aux = (void *)ax; | |
1470 | return 0; | |
1471 | } | |
1472 | ||
1473 | /** | |
1474 | * __audit_mq_notify - record audit data for a POSIX MQ notify | |
1475 | * @mqdes: MQ descriptor | |
1476 | * @u_notification: Notification event | |
1477 | * | |
1478 | * Returns 0 for success or NULL context or < 0 on error. | |
1479 | */ | |
1480 | ||
1481 | int __audit_mq_notify(mqd_t mqdes, const struct sigevent __user *u_notification) | |
1482 | { | |
1483 | struct audit_aux_data_mq_notify *ax; | |
1484 | struct audit_context *context = current->audit_context; | |
1485 | ||
1486 | if (!audit_enabled) | |
1487 | return 0; | |
1488 | ||
1489 | if (likely(!context)) | |
1490 | return 0; | |
1491 | ||
1492 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1493 | if (!ax) | |
1494 | return -ENOMEM; | |
1495 | ||
1496 | if (u_notification != NULL) { | |
1497 | if (copy_from_user(&ax->notification, u_notification, sizeof(ax->notification))) { | |
1498 | kfree(ax); | |
1499 | return -EFAULT; | |
1500 | } | |
1501 | } else | |
1502 | memset(&ax->notification, 0, sizeof(ax->notification)); | |
1503 | ||
1504 | ax->mqdes = mqdes; | |
1505 | ||
1506 | ax->d.type = AUDIT_MQ_NOTIFY; | |
1507 | ax->d.next = context->aux; | |
1508 | context->aux = (void *)ax; | |
1509 | return 0; | |
1510 | } | |
1511 | ||
1512 | /** | |
1513 | * __audit_mq_getsetattr - record audit data for a POSIX MQ get/set attribute | |
1514 | * @mqdes: MQ descriptor | |
1515 | * @mqstat: MQ flags | |
1516 | * | |
1517 | * Returns 0 for success or NULL context or < 0 on error. | |
1518 | */ | |
1519 | int __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat) | |
1520 | { | |
1521 | struct audit_aux_data_mq_getsetattr *ax; | |
1522 | struct audit_context *context = current->audit_context; | |
1523 | ||
1524 | if (!audit_enabled) | |
1525 | return 0; | |
1526 | ||
1527 | if (likely(!context)) | |
1528 | return 0; | |
1529 | ||
1530 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1531 | if (!ax) | |
1532 | return -ENOMEM; | |
1533 | ||
1534 | ax->mqdes = mqdes; | |
1535 | ax->mqstat = *mqstat; | |
1536 | ||
1537 | ax->d.type = AUDIT_MQ_GETSETATTR; | |
1538 | ax->d.next = context->aux; | |
1539 | context->aux = (void *)ax; | |
1540 | return 0; | |
1541 | } | |
1542 | ||
b0dd25a8 | 1543 | /** |
073115d6 SG |
1544 | * audit_ipc_obj - record audit data for ipc object |
1545 | * @ipcp: ipc permissions | |
1546 | * | |
1547 | * Returns 0 for success or NULL context or < 0 on error. | |
1548 | */ | |
d8945bb5 | 1549 | int __audit_ipc_obj(struct kern_ipc_perm *ipcp) |
073115d6 SG |
1550 | { |
1551 | struct audit_aux_data_ipcctl *ax; | |
1552 | struct audit_context *context = current->audit_context; | |
1553 | ||
073115d6 SG |
1554 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); |
1555 | if (!ax) | |
1556 | return -ENOMEM; | |
1557 | ||
1558 | ax->uid = ipcp->uid; | |
1559 | ax->gid = ipcp->gid; | |
1560 | ax->mode = ipcp->mode; | |
1561 | selinux_get_ipc_sid(ipcp, &ax->osid); | |
1562 | ||
1563 | ax->d.type = AUDIT_IPC; | |
1564 | ax->d.next = context->aux; | |
1565 | context->aux = (void *)ax; | |
1566 | return 0; | |
1567 | } | |
1568 | ||
1569 | /** | |
1570 | * audit_ipc_set_perm - record audit data for new ipc permissions | |
b0dd25a8 RD |
1571 | * @qbytes: msgq bytes |
1572 | * @uid: msgq user id | |
1573 | * @gid: msgq group id | |
1574 | * @mode: msgq mode (permissions) | |
1575 | * | |
1576 | * Returns 0 for success or NULL context or < 0 on error. | |
1577 | */ | |
d8945bb5 | 1578 | int __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode) |
1da177e4 LT |
1579 | { |
1580 | struct audit_aux_data_ipcctl *ax; | |
1581 | struct audit_context *context = current->audit_context; | |
1582 | ||
8c8570fb | 1583 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); |
1da177e4 LT |
1584 | if (!ax) |
1585 | return -ENOMEM; | |
1586 | ||
1587 | ax->qbytes = qbytes; | |
1588 | ax->uid = uid; | |
1589 | ax->gid = gid; | |
1590 | ax->mode = mode; | |
1591 | ||
073115d6 | 1592 | ax->d.type = AUDIT_IPC_SET_PERM; |
1da177e4 LT |
1593 | ax->d.next = context->aux; |
1594 | context->aux = (void *)ax; | |
1595 | return 0; | |
1596 | } | |
c2f0c7c3 | 1597 | |
473ae30b AV |
1598 | int audit_bprm(struct linux_binprm *bprm) |
1599 | { | |
1600 | struct audit_aux_data_execve *ax; | |
1601 | struct audit_context *context = current->audit_context; | |
1602 | unsigned long p, next; | |
1603 | void *to; | |
1604 | ||
1605 | if (likely(!audit_enabled || !context)) | |
1606 | return 0; | |
1607 | ||
1608 | ax = kmalloc(sizeof(*ax) + PAGE_SIZE * MAX_ARG_PAGES - bprm->p, | |
1609 | GFP_KERNEL); | |
1610 | if (!ax) | |
1611 | return -ENOMEM; | |
1612 | ||
1613 | ax->argc = bprm->argc; | |
1614 | ax->envc = bprm->envc; | |
1615 | for (p = bprm->p, to = ax->mem; p < MAX_ARG_PAGES*PAGE_SIZE; p = next) { | |
1616 | struct page *page = bprm->page[p / PAGE_SIZE]; | |
1617 | void *kaddr = kmap(page); | |
1618 | next = (p + PAGE_SIZE) & ~(PAGE_SIZE - 1); | |
1619 | memcpy(to, kaddr + (p & (PAGE_SIZE - 1)), next - p); | |
1620 | to += next - p; | |
1621 | kunmap(page); | |
1622 | } | |
1623 | ||
1624 | ax->d.type = AUDIT_EXECVE; | |
1625 | ax->d.next = context->aux; | |
1626 | context->aux = (void *)ax; | |
1627 | return 0; | |
1628 | } | |
1629 | ||
1630 | ||
b0dd25a8 RD |
1631 | /** |
1632 | * audit_socketcall - record audit data for sys_socketcall | |
1633 | * @nargs: number of args | |
1634 | * @args: args array | |
1635 | * | |
1636 | * Returns 0 for success or NULL context or < 0 on error. | |
1637 | */ | |
3ec3b2fb DW |
1638 | int audit_socketcall(int nargs, unsigned long *args) |
1639 | { | |
1640 | struct audit_aux_data_socketcall *ax; | |
1641 | struct audit_context *context = current->audit_context; | |
1642 | ||
1643 | if (likely(!context)) | |
1644 | return 0; | |
1645 | ||
1646 | ax = kmalloc(sizeof(*ax) + nargs * sizeof(unsigned long), GFP_KERNEL); | |
1647 | if (!ax) | |
1648 | return -ENOMEM; | |
1649 | ||
1650 | ax->nargs = nargs; | |
1651 | memcpy(ax->args, args, nargs * sizeof(unsigned long)); | |
1652 | ||
1653 | ax->d.type = AUDIT_SOCKETCALL; | |
1654 | ax->d.next = context->aux; | |
1655 | context->aux = (void *)ax; | |
1656 | return 0; | |
1657 | } | |
1658 | ||
b0dd25a8 RD |
1659 | /** |
1660 | * audit_sockaddr - record audit data for sys_bind, sys_connect, sys_sendto | |
1661 | * @len: data length in user space | |
1662 | * @a: data address in kernel space | |
1663 | * | |
1664 | * Returns 0 for success or NULL context or < 0 on error. | |
1665 | */ | |
3ec3b2fb DW |
1666 | int audit_sockaddr(int len, void *a) |
1667 | { | |
1668 | struct audit_aux_data_sockaddr *ax; | |
1669 | struct audit_context *context = current->audit_context; | |
1670 | ||
1671 | if (likely(!context)) | |
1672 | return 0; | |
1673 | ||
1674 | ax = kmalloc(sizeof(*ax) + len, GFP_KERNEL); | |
1675 | if (!ax) | |
1676 | return -ENOMEM; | |
1677 | ||
1678 | ax->len = len; | |
1679 | memcpy(ax->a, a, len); | |
1680 | ||
1681 | ax->d.type = AUDIT_SOCKADDR; | |
1682 | ax->d.next = context->aux; | |
1683 | context->aux = (void *)ax; | |
1684 | return 0; | |
1685 | } | |
1686 | ||
b0dd25a8 RD |
1687 | /** |
1688 | * audit_avc_path - record the granting or denial of permissions | |
1689 | * @dentry: dentry to record | |
1690 | * @mnt: mnt to record | |
1691 | * | |
1692 | * Returns 0 for success or NULL context or < 0 on error. | |
1693 | * | |
1694 | * Called from security/selinux/avc.c::avc_audit() | |
1695 | */ | |
01116105 SS |
1696 | int audit_avc_path(struct dentry *dentry, struct vfsmount *mnt) |
1697 | { | |
1698 | struct audit_aux_data_path *ax; | |
1699 | struct audit_context *context = current->audit_context; | |
1700 | ||
1701 | if (likely(!context)) | |
1702 | return 0; | |
1703 | ||
1704 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1705 | if (!ax) | |
1706 | return -ENOMEM; | |
1707 | ||
1708 | ax->dentry = dget(dentry); | |
1709 | ax->mnt = mntget(mnt); | |
1710 | ||
1711 | ax->d.type = AUDIT_AVC_PATH; | |
1712 | ax->d.next = context->aux; | |
1713 | context->aux = (void *)ax; | |
1714 | return 0; | |
1715 | } | |
1716 | ||
b0dd25a8 RD |
1717 | /** |
1718 | * audit_signal_info - record signal info for shutting down audit subsystem | |
1719 | * @sig: signal value | |
1720 | * @t: task being signaled | |
1721 | * | |
1722 | * If the audit subsystem is being terminated, record the task (pid) | |
1723 | * and uid that is doing that. | |
1724 | */ | |
e1396065 | 1725 | void __audit_signal_info(int sig, struct task_struct *t) |
c2f0c7c3 SG |
1726 | { |
1727 | extern pid_t audit_sig_pid; | |
1728 | extern uid_t audit_sig_uid; | |
e1396065 AV |
1729 | extern u32 audit_sig_sid; |
1730 | ||
1731 | if (sig == SIGTERM || sig == SIGHUP || sig == SIGUSR1) { | |
1732 | struct task_struct *tsk = current; | |
1733 | struct audit_context *ctx = tsk->audit_context; | |
1734 | audit_sig_pid = tsk->pid; | |
1735 | if (ctx) | |
1736 | audit_sig_uid = ctx->loginuid; | |
1737 | else | |
1738 | audit_sig_uid = tsk->uid; | |
1739 | selinux_get_task_sid(tsk, &audit_sig_sid); | |
c2f0c7c3 SG |
1740 | } |
1741 | } |