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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> |
a1f8e7f7 | 67 | #include <linux/highmem.h> |
f46038ff | 68 | #include <linux/syscalls.h> |
1da177e4 | 69 | |
fe7752ba | 70 | #include "audit.h" |
1da177e4 | 71 | |
fe7752ba | 72 | extern struct list_head audit_filter_list[]; |
1da177e4 LT |
73 | |
74 | /* No syscall auditing will take place unless audit_enabled != 0. */ | |
75 | extern int audit_enabled; | |
76 | ||
77 | /* AUDIT_NAMES is the number of slots we reserve in the audit_context | |
78 | * for saving names from getname(). */ | |
79 | #define AUDIT_NAMES 20 | |
80 | ||
81 | /* AUDIT_NAMES_RESERVED is the number of slots we reserve in the | |
82 | * audit_context from being used for nameless inodes from | |
83 | * path_lookup. */ | |
84 | #define AUDIT_NAMES_RESERVED 7 | |
85 | ||
9c937dcc AG |
86 | /* Indicates that audit should log the full pathname. */ |
87 | #define AUDIT_NAME_FULL -1 | |
88 | ||
471a5c7c AV |
89 | /* number of audit rules */ |
90 | int audit_n_rules; | |
91 | ||
1da177e4 LT |
92 | /* When fs/namei.c:getname() is called, we store the pointer in name and |
93 | * we don't let putname() free it (instead we free all of the saved | |
94 | * pointers at syscall exit time). | |
95 | * | |
96 | * Further, in fs/namei.c:path_lookup() we store the inode and device. */ | |
97 | struct audit_names { | |
98 | const char *name; | |
9c937dcc AG |
99 | int name_len; /* number of name's characters to log */ |
100 | unsigned name_put; /* call __putname() for this name */ | |
1da177e4 LT |
101 | unsigned long ino; |
102 | dev_t dev; | |
103 | umode_t mode; | |
104 | uid_t uid; | |
105 | gid_t gid; | |
106 | dev_t rdev; | |
1b50eed9 | 107 | u32 osid; |
1da177e4 LT |
108 | }; |
109 | ||
110 | struct audit_aux_data { | |
111 | struct audit_aux_data *next; | |
112 | int type; | |
113 | }; | |
114 | ||
115 | #define AUDIT_AUX_IPCPERM 0 | |
116 | ||
20ca73bc GW |
117 | struct audit_aux_data_mq_open { |
118 | struct audit_aux_data d; | |
119 | int oflag; | |
120 | mode_t mode; | |
121 | struct mq_attr attr; | |
122 | }; | |
123 | ||
124 | struct audit_aux_data_mq_sendrecv { | |
125 | struct audit_aux_data d; | |
126 | mqd_t mqdes; | |
127 | size_t msg_len; | |
128 | unsigned int msg_prio; | |
129 | struct timespec abs_timeout; | |
130 | }; | |
131 | ||
132 | struct audit_aux_data_mq_notify { | |
133 | struct audit_aux_data d; | |
134 | mqd_t mqdes; | |
135 | struct sigevent notification; | |
136 | }; | |
137 | ||
138 | struct audit_aux_data_mq_getsetattr { | |
139 | struct audit_aux_data d; | |
140 | mqd_t mqdes; | |
141 | struct mq_attr mqstat; | |
142 | }; | |
143 | ||
1da177e4 LT |
144 | struct audit_aux_data_ipcctl { |
145 | struct audit_aux_data d; | |
146 | struct ipc_perm p; | |
147 | unsigned long qbytes; | |
148 | uid_t uid; | |
149 | gid_t gid; | |
150 | mode_t mode; | |
9c7aa6aa | 151 | u32 osid; |
1da177e4 LT |
152 | }; |
153 | ||
473ae30b AV |
154 | struct audit_aux_data_execve { |
155 | struct audit_aux_data d; | |
156 | int argc; | |
157 | int envc; | |
158 | char mem[0]; | |
159 | }; | |
160 | ||
3ec3b2fb DW |
161 | struct audit_aux_data_socketcall { |
162 | struct audit_aux_data d; | |
163 | int nargs; | |
164 | unsigned long args[0]; | |
165 | }; | |
166 | ||
167 | struct audit_aux_data_sockaddr { | |
168 | struct audit_aux_data d; | |
169 | int len; | |
170 | char a[0]; | |
171 | }; | |
172 | ||
01116105 SS |
173 | struct audit_aux_data_path { |
174 | struct audit_aux_data d; | |
175 | struct dentry *dentry; | |
176 | struct vfsmount *mnt; | |
177 | }; | |
1da177e4 LT |
178 | |
179 | /* The per-task audit context. */ | |
180 | struct audit_context { | |
d51374ad | 181 | int dummy; /* must be the first element */ |
1da177e4 LT |
182 | int in_syscall; /* 1 if task is in a syscall */ |
183 | enum audit_state state; | |
184 | unsigned int serial; /* serial number for record */ | |
185 | struct timespec ctime; /* time of syscall entry */ | |
186 | uid_t loginuid; /* login uid (identity) */ | |
187 | int major; /* syscall number */ | |
188 | unsigned long argv[4]; /* syscall arguments */ | |
189 | int return_valid; /* return code is valid */ | |
2fd6f58b | 190 | long return_code;/* syscall return code */ |
1da177e4 LT |
191 | int auditable; /* 1 if record should be written */ |
192 | int name_count; | |
193 | struct audit_names names[AUDIT_NAMES]; | |
5adc8a6a | 194 | char * filterkey; /* key for rule that triggered record */ |
8f37d47c DW |
195 | struct dentry * pwd; |
196 | struct vfsmount * pwdmnt; | |
1da177e4 LT |
197 | struct audit_context *previous; /* For nested syscalls */ |
198 | struct audit_aux_data *aux; | |
199 | ||
200 | /* Save things to print about task_struct */ | |
f46038ff | 201 | pid_t pid, ppid; |
1da177e4 LT |
202 | uid_t uid, euid, suid, fsuid; |
203 | gid_t gid, egid, sgid, fsgid; | |
204 | unsigned long personality; | |
2fd6f58b | 205 | int arch; |
1da177e4 LT |
206 | |
207 | #if AUDIT_DEBUG | |
208 | int put_count; | |
209 | int ino_count; | |
210 | #endif | |
211 | }; | |
212 | ||
55669bfa AV |
213 | #define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE]) |
214 | static inline int open_arg(int flags, int mask) | |
215 | { | |
216 | int n = ACC_MODE(flags); | |
217 | if (flags & (O_TRUNC | O_CREAT)) | |
218 | n |= AUDIT_PERM_WRITE; | |
219 | return n & mask; | |
220 | } | |
221 | ||
222 | static int audit_match_perm(struct audit_context *ctx, int mask) | |
223 | { | |
224 | unsigned n = ctx->major; | |
225 | switch (audit_classify_syscall(ctx->arch, n)) { | |
226 | case 0: /* native */ | |
227 | if ((mask & AUDIT_PERM_WRITE) && | |
228 | audit_match_class(AUDIT_CLASS_WRITE, n)) | |
229 | return 1; | |
230 | if ((mask & AUDIT_PERM_READ) && | |
231 | audit_match_class(AUDIT_CLASS_READ, n)) | |
232 | return 1; | |
233 | if ((mask & AUDIT_PERM_ATTR) && | |
234 | audit_match_class(AUDIT_CLASS_CHATTR, n)) | |
235 | return 1; | |
236 | return 0; | |
237 | case 1: /* 32bit on biarch */ | |
238 | if ((mask & AUDIT_PERM_WRITE) && | |
239 | audit_match_class(AUDIT_CLASS_WRITE_32, n)) | |
240 | return 1; | |
241 | if ((mask & AUDIT_PERM_READ) && | |
242 | audit_match_class(AUDIT_CLASS_READ_32, n)) | |
243 | return 1; | |
244 | if ((mask & AUDIT_PERM_ATTR) && | |
245 | audit_match_class(AUDIT_CLASS_CHATTR_32, n)) | |
246 | return 1; | |
247 | return 0; | |
248 | case 2: /* open */ | |
249 | return mask & ACC_MODE(ctx->argv[1]); | |
250 | case 3: /* openat */ | |
251 | return mask & ACC_MODE(ctx->argv[2]); | |
252 | case 4: /* socketcall */ | |
253 | return ((mask & AUDIT_PERM_WRITE) && ctx->argv[0] == SYS_BIND); | |
254 | case 5: /* execve */ | |
255 | return mask & AUDIT_PERM_EXEC; | |
256 | default: | |
257 | return 0; | |
258 | } | |
259 | } | |
260 | ||
f368c07d | 261 | /* Determine if any context name data matches a rule's watch data */ |
1da177e4 LT |
262 | /* Compare a task_struct with an audit_rule. Return 1 on match, 0 |
263 | * otherwise. */ | |
264 | static int audit_filter_rules(struct task_struct *tsk, | |
93315ed6 | 265 | struct audit_krule *rule, |
1da177e4 | 266 | struct audit_context *ctx, |
f368c07d | 267 | struct audit_names *name, |
1da177e4 LT |
268 | enum audit_state *state) |
269 | { | |
2ad312d2 | 270 | int i, j, need_sid = 1; |
3dc7e315 DG |
271 | u32 sid; |
272 | ||
1da177e4 | 273 | for (i = 0; i < rule->field_count; i++) { |
93315ed6 | 274 | struct audit_field *f = &rule->fields[i]; |
1da177e4 LT |
275 | int result = 0; |
276 | ||
93315ed6 | 277 | switch (f->type) { |
1da177e4 | 278 | case AUDIT_PID: |
93315ed6 | 279 | result = audit_comparator(tsk->pid, f->op, f->val); |
1da177e4 | 280 | break; |
3c66251e | 281 | case AUDIT_PPID: |
419c58f1 AV |
282 | if (ctx) { |
283 | if (!ctx->ppid) | |
284 | ctx->ppid = sys_getppid(); | |
3c66251e | 285 | result = audit_comparator(ctx->ppid, f->op, f->val); |
419c58f1 | 286 | } |
3c66251e | 287 | break; |
1da177e4 | 288 | case AUDIT_UID: |
93315ed6 | 289 | result = audit_comparator(tsk->uid, f->op, f->val); |
1da177e4 LT |
290 | break; |
291 | case AUDIT_EUID: | |
93315ed6 | 292 | result = audit_comparator(tsk->euid, f->op, f->val); |
1da177e4 LT |
293 | break; |
294 | case AUDIT_SUID: | |
93315ed6 | 295 | result = audit_comparator(tsk->suid, f->op, f->val); |
1da177e4 LT |
296 | break; |
297 | case AUDIT_FSUID: | |
93315ed6 | 298 | result = audit_comparator(tsk->fsuid, f->op, f->val); |
1da177e4 LT |
299 | break; |
300 | case AUDIT_GID: | |
93315ed6 | 301 | result = audit_comparator(tsk->gid, f->op, f->val); |
1da177e4 LT |
302 | break; |
303 | case AUDIT_EGID: | |
93315ed6 | 304 | result = audit_comparator(tsk->egid, f->op, f->val); |
1da177e4 LT |
305 | break; |
306 | case AUDIT_SGID: | |
93315ed6 | 307 | result = audit_comparator(tsk->sgid, f->op, f->val); |
1da177e4 LT |
308 | break; |
309 | case AUDIT_FSGID: | |
93315ed6 | 310 | result = audit_comparator(tsk->fsgid, f->op, f->val); |
1da177e4 LT |
311 | break; |
312 | case AUDIT_PERS: | |
93315ed6 | 313 | result = audit_comparator(tsk->personality, f->op, f->val); |
1da177e4 | 314 | break; |
2fd6f58b | 315 | case AUDIT_ARCH: |
b63862f4 | 316 | if (ctx) |
93315ed6 | 317 | result = audit_comparator(ctx->arch, f->op, f->val); |
2fd6f58b | 318 | break; |
1da177e4 LT |
319 | |
320 | case AUDIT_EXIT: | |
321 | if (ctx && ctx->return_valid) | |
93315ed6 | 322 | result = audit_comparator(ctx->return_code, f->op, f->val); |
1da177e4 LT |
323 | break; |
324 | case AUDIT_SUCCESS: | |
b01f2cc1 | 325 | if (ctx && ctx->return_valid) { |
93315ed6 AG |
326 | if (f->val) |
327 | result = audit_comparator(ctx->return_valid, f->op, AUDITSC_SUCCESS); | |
b01f2cc1 | 328 | else |
93315ed6 | 329 | result = audit_comparator(ctx->return_valid, f->op, AUDITSC_FAILURE); |
b01f2cc1 | 330 | } |
1da177e4 LT |
331 | break; |
332 | case AUDIT_DEVMAJOR: | |
f368c07d AG |
333 | if (name) |
334 | result = audit_comparator(MAJOR(name->dev), | |
335 | f->op, f->val); | |
336 | else if (ctx) { | |
1da177e4 | 337 | for (j = 0; j < ctx->name_count; j++) { |
93315ed6 | 338 | if (audit_comparator(MAJOR(ctx->names[j].dev), f->op, f->val)) { |
1da177e4 LT |
339 | ++result; |
340 | break; | |
341 | } | |
342 | } | |
343 | } | |
344 | break; | |
345 | case AUDIT_DEVMINOR: | |
f368c07d AG |
346 | if (name) |
347 | result = audit_comparator(MINOR(name->dev), | |
348 | f->op, f->val); | |
349 | else if (ctx) { | |
1da177e4 | 350 | for (j = 0; j < ctx->name_count; j++) { |
93315ed6 | 351 | if (audit_comparator(MINOR(ctx->names[j].dev), f->op, f->val)) { |
1da177e4 LT |
352 | ++result; |
353 | break; | |
354 | } | |
355 | } | |
356 | } | |
357 | break; | |
358 | case AUDIT_INODE: | |
f368c07d | 359 | if (name) |
9c937dcc | 360 | result = (name->ino == f->val); |
f368c07d | 361 | else if (ctx) { |
1da177e4 | 362 | for (j = 0; j < ctx->name_count; j++) { |
9c937dcc | 363 | if (audit_comparator(ctx->names[j].ino, f->op, f->val)) { |
1da177e4 LT |
364 | ++result; |
365 | break; | |
366 | } | |
367 | } | |
368 | } | |
369 | break; | |
f368c07d AG |
370 | case AUDIT_WATCH: |
371 | if (name && rule->watch->ino != (unsigned long)-1) | |
372 | result = (name->dev == rule->watch->dev && | |
9c937dcc | 373 | name->ino == rule->watch->ino); |
f368c07d | 374 | break; |
1da177e4 LT |
375 | case AUDIT_LOGINUID: |
376 | result = 0; | |
377 | if (ctx) | |
93315ed6 | 378 | result = audit_comparator(ctx->loginuid, f->op, f->val); |
1da177e4 | 379 | break; |
3a6b9f85 DG |
380 | case AUDIT_SUBJ_USER: |
381 | case AUDIT_SUBJ_ROLE: | |
382 | case AUDIT_SUBJ_TYPE: | |
383 | case AUDIT_SUBJ_SEN: | |
384 | case AUDIT_SUBJ_CLR: | |
3dc7e315 DG |
385 | /* NOTE: this may return negative values indicating |
386 | a temporary error. We simply treat this as a | |
387 | match for now to avoid losing information that | |
388 | may be wanted. An error message will also be | |
389 | logged upon error */ | |
2ad312d2 SG |
390 | if (f->se_rule) { |
391 | if (need_sid) { | |
62bac018 | 392 | selinux_get_task_sid(tsk, &sid); |
2ad312d2 SG |
393 | need_sid = 0; |
394 | } | |
3dc7e315 DG |
395 | result = selinux_audit_rule_match(sid, f->type, |
396 | f->op, | |
397 | f->se_rule, | |
398 | ctx); | |
2ad312d2 | 399 | } |
3dc7e315 | 400 | break; |
6e5a2d1d DG |
401 | case AUDIT_OBJ_USER: |
402 | case AUDIT_OBJ_ROLE: | |
403 | case AUDIT_OBJ_TYPE: | |
404 | case AUDIT_OBJ_LEV_LOW: | |
405 | case AUDIT_OBJ_LEV_HIGH: | |
406 | /* The above note for AUDIT_SUBJ_USER...AUDIT_SUBJ_CLR | |
407 | also applies here */ | |
408 | if (f->se_rule) { | |
409 | /* Find files that match */ | |
410 | if (name) { | |
411 | result = selinux_audit_rule_match( | |
412 | name->osid, f->type, f->op, | |
413 | f->se_rule, ctx); | |
414 | } else if (ctx) { | |
415 | for (j = 0; j < ctx->name_count; j++) { | |
416 | if (selinux_audit_rule_match( | |
417 | ctx->names[j].osid, | |
418 | f->type, f->op, | |
419 | f->se_rule, ctx)) { | |
420 | ++result; | |
421 | break; | |
422 | } | |
423 | } | |
424 | } | |
425 | /* Find ipc objects that match */ | |
426 | if (ctx) { | |
427 | struct audit_aux_data *aux; | |
428 | for (aux = ctx->aux; aux; | |
429 | aux = aux->next) { | |
430 | if (aux->type == AUDIT_IPC) { | |
431 | struct audit_aux_data_ipcctl *axi = (void *)aux; | |
432 | if (selinux_audit_rule_match(axi->osid, f->type, f->op, f->se_rule, ctx)) { | |
433 | ++result; | |
434 | break; | |
435 | } | |
436 | } | |
437 | } | |
438 | } | |
439 | } | |
440 | break; | |
1da177e4 LT |
441 | case AUDIT_ARG0: |
442 | case AUDIT_ARG1: | |
443 | case AUDIT_ARG2: | |
444 | case AUDIT_ARG3: | |
445 | if (ctx) | |
93315ed6 | 446 | result = audit_comparator(ctx->argv[f->type-AUDIT_ARG0], f->op, f->val); |
1da177e4 | 447 | break; |
5adc8a6a AG |
448 | case AUDIT_FILTERKEY: |
449 | /* ignore this field for filtering */ | |
450 | result = 1; | |
451 | break; | |
55669bfa AV |
452 | case AUDIT_PERM: |
453 | result = audit_match_perm(ctx, f->val); | |
454 | break; | |
1da177e4 LT |
455 | } |
456 | ||
1da177e4 LT |
457 | if (!result) |
458 | return 0; | |
459 | } | |
5adc8a6a AG |
460 | if (rule->filterkey) |
461 | ctx->filterkey = kstrdup(rule->filterkey, GFP_ATOMIC); | |
1da177e4 LT |
462 | switch (rule->action) { |
463 | case AUDIT_NEVER: *state = AUDIT_DISABLED; break; | |
1da177e4 LT |
464 | case AUDIT_ALWAYS: *state = AUDIT_RECORD_CONTEXT; break; |
465 | } | |
466 | return 1; | |
467 | } | |
468 | ||
469 | /* At process creation time, we can determine if system-call auditing is | |
470 | * completely disabled for this task. Since we only have the task | |
471 | * structure at this point, we can only check uid and gid. | |
472 | */ | |
473 | static enum audit_state audit_filter_task(struct task_struct *tsk) | |
474 | { | |
475 | struct audit_entry *e; | |
476 | enum audit_state state; | |
477 | ||
478 | rcu_read_lock(); | |
0f45aa18 | 479 | list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_TASK], list) { |
f368c07d | 480 | if (audit_filter_rules(tsk, &e->rule, NULL, NULL, &state)) { |
1da177e4 LT |
481 | rcu_read_unlock(); |
482 | return state; | |
483 | } | |
484 | } | |
485 | rcu_read_unlock(); | |
486 | return AUDIT_BUILD_CONTEXT; | |
487 | } | |
488 | ||
489 | /* At syscall entry and exit time, this filter is called if the | |
490 | * audit_state is not low enough that auditing cannot take place, but is | |
23f32d18 | 491 | * also not high enough that we already know we have to write an audit |
b0dd25a8 | 492 | * record (i.e., the state is AUDIT_SETUP_CONTEXT or AUDIT_BUILD_CONTEXT). |
1da177e4 LT |
493 | */ |
494 | static enum audit_state audit_filter_syscall(struct task_struct *tsk, | |
495 | struct audit_context *ctx, | |
496 | struct list_head *list) | |
497 | { | |
498 | struct audit_entry *e; | |
c3896495 | 499 | enum audit_state state; |
1da177e4 | 500 | |
351bb722 | 501 | if (audit_pid && tsk->tgid == audit_pid) |
f7056d64 DW |
502 | return AUDIT_DISABLED; |
503 | ||
1da177e4 | 504 | rcu_read_lock(); |
c3896495 | 505 | if (!list_empty(list)) { |
b63862f4 DK |
506 | int word = AUDIT_WORD(ctx->major); |
507 | int bit = AUDIT_BIT(ctx->major); | |
508 | ||
509 | list_for_each_entry_rcu(e, list, list) { | |
f368c07d AG |
510 | if ((e->rule.mask[word] & bit) == bit && |
511 | audit_filter_rules(tsk, &e->rule, ctx, NULL, | |
512 | &state)) { | |
513 | rcu_read_unlock(); | |
514 | return state; | |
515 | } | |
516 | } | |
517 | } | |
518 | rcu_read_unlock(); | |
519 | return AUDIT_BUILD_CONTEXT; | |
520 | } | |
521 | ||
522 | /* At syscall exit time, this filter is called if any audit_names[] have been | |
523 | * collected during syscall processing. We only check rules in sublists at hash | |
524 | * buckets applicable to the inode numbers in audit_names[]. | |
525 | * Regarding audit_state, same rules apply as for audit_filter_syscall(). | |
526 | */ | |
527 | enum audit_state audit_filter_inodes(struct task_struct *tsk, | |
528 | struct audit_context *ctx) | |
529 | { | |
530 | int i; | |
531 | struct audit_entry *e; | |
532 | enum audit_state state; | |
533 | ||
534 | if (audit_pid && tsk->tgid == audit_pid) | |
535 | return AUDIT_DISABLED; | |
536 | ||
537 | rcu_read_lock(); | |
538 | for (i = 0; i < ctx->name_count; i++) { | |
539 | int word = AUDIT_WORD(ctx->major); | |
540 | int bit = AUDIT_BIT(ctx->major); | |
541 | struct audit_names *n = &ctx->names[i]; | |
542 | int h = audit_hash_ino((u32)n->ino); | |
543 | struct list_head *list = &audit_inode_hash[h]; | |
544 | ||
545 | if (list_empty(list)) | |
546 | continue; | |
547 | ||
548 | list_for_each_entry_rcu(e, list, list) { | |
549 | if ((e->rule.mask[word] & bit) == bit && | |
550 | audit_filter_rules(tsk, &e->rule, ctx, n, &state)) { | |
b63862f4 DK |
551 | rcu_read_unlock(); |
552 | return state; | |
553 | } | |
0f45aa18 DW |
554 | } |
555 | } | |
556 | rcu_read_unlock(); | |
1da177e4 | 557 | return AUDIT_BUILD_CONTEXT; |
0f45aa18 DW |
558 | } |
559 | ||
f368c07d AG |
560 | void audit_set_auditable(struct audit_context *ctx) |
561 | { | |
562 | ctx->auditable = 1; | |
563 | } | |
564 | ||
1da177e4 LT |
565 | static inline struct audit_context *audit_get_context(struct task_struct *tsk, |
566 | int return_valid, | |
567 | int return_code) | |
568 | { | |
569 | struct audit_context *context = tsk->audit_context; | |
570 | ||
571 | if (likely(!context)) | |
572 | return NULL; | |
573 | context->return_valid = return_valid; | |
574 | context->return_code = return_code; | |
575 | ||
d51374ad | 576 | if (context->in_syscall && !context->dummy && !context->auditable) { |
1da177e4 | 577 | enum audit_state state; |
f368c07d | 578 | |
0f45aa18 | 579 | state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_EXIT]); |
f368c07d AG |
580 | if (state == AUDIT_RECORD_CONTEXT) { |
581 | context->auditable = 1; | |
582 | goto get_context; | |
583 | } | |
584 | ||
585 | state = audit_filter_inodes(tsk, context); | |
1da177e4 LT |
586 | if (state == AUDIT_RECORD_CONTEXT) |
587 | context->auditable = 1; | |
f368c07d | 588 | |
1da177e4 LT |
589 | } |
590 | ||
f368c07d | 591 | get_context: |
3f2792ff | 592 | |
1da177e4 LT |
593 | tsk->audit_context = NULL; |
594 | return context; | |
595 | } | |
596 | ||
597 | static inline void audit_free_names(struct audit_context *context) | |
598 | { | |
599 | int i; | |
600 | ||
601 | #if AUDIT_DEBUG == 2 | |
602 | if (context->auditable | |
603 | ||context->put_count + context->ino_count != context->name_count) { | |
73241ccc | 604 | printk(KERN_ERR "%s:%d(:%d): major=%d in_syscall=%d" |
1da177e4 LT |
605 | " name_count=%d put_count=%d" |
606 | " ino_count=%d [NOT freeing]\n", | |
73241ccc | 607 | __FILE__, __LINE__, |
1da177e4 LT |
608 | context->serial, context->major, context->in_syscall, |
609 | context->name_count, context->put_count, | |
610 | context->ino_count); | |
8c8570fb | 611 | for (i = 0; i < context->name_count; i++) { |
1da177e4 LT |
612 | printk(KERN_ERR "names[%d] = %p = %s\n", i, |
613 | context->names[i].name, | |
73241ccc | 614 | context->names[i].name ?: "(null)"); |
8c8570fb | 615 | } |
1da177e4 LT |
616 | dump_stack(); |
617 | return; | |
618 | } | |
619 | #endif | |
620 | #if AUDIT_DEBUG | |
621 | context->put_count = 0; | |
622 | context->ino_count = 0; | |
623 | #endif | |
624 | ||
8c8570fb | 625 | for (i = 0; i < context->name_count; i++) { |
9c937dcc | 626 | if (context->names[i].name && context->names[i].name_put) |
1da177e4 | 627 | __putname(context->names[i].name); |
8c8570fb | 628 | } |
1da177e4 | 629 | context->name_count = 0; |
8f37d47c DW |
630 | if (context->pwd) |
631 | dput(context->pwd); | |
632 | if (context->pwdmnt) | |
633 | mntput(context->pwdmnt); | |
634 | context->pwd = NULL; | |
635 | context->pwdmnt = NULL; | |
1da177e4 LT |
636 | } |
637 | ||
638 | static inline void audit_free_aux(struct audit_context *context) | |
639 | { | |
640 | struct audit_aux_data *aux; | |
641 | ||
642 | while ((aux = context->aux)) { | |
01116105 SS |
643 | if (aux->type == AUDIT_AVC_PATH) { |
644 | struct audit_aux_data_path *axi = (void *)aux; | |
645 | dput(axi->dentry); | |
646 | mntput(axi->mnt); | |
647 | } | |
8c8570fb | 648 | |
1da177e4 LT |
649 | context->aux = aux->next; |
650 | kfree(aux); | |
651 | } | |
652 | } | |
653 | ||
654 | static inline void audit_zero_context(struct audit_context *context, | |
655 | enum audit_state state) | |
656 | { | |
657 | uid_t loginuid = context->loginuid; | |
658 | ||
659 | memset(context, 0, sizeof(*context)); | |
660 | context->state = state; | |
661 | context->loginuid = loginuid; | |
662 | } | |
663 | ||
664 | static inline struct audit_context *audit_alloc_context(enum audit_state state) | |
665 | { | |
666 | struct audit_context *context; | |
667 | ||
668 | if (!(context = kmalloc(sizeof(*context), GFP_KERNEL))) | |
669 | return NULL; | |
670 | audit_zero_context(context, state); | |
671 | return context; | |
672 | } | |
673 | ||
b0dd25a8 RD |
674 | /** |
675 | * audit_alloc - allocate an audit context block for a task | |
676 | * @tsk: task | |
677 | * | |
678 | * Filter on the task information and allocate a per-task audit context | |
1da177e4 LT |
679 | * if necessary. Doing so turns on system call auditing for the |
680 | * specified task. This is called from copy_process, so no lock is | |
b0dd25a8 RD |
681 | * needed. |
682 | */ | |
1da177e4 LT |
683 | int audit_alloc(struct task_struct *tsk) |
684 | { | |
685 | struct audit_context *context; | |
686 | enum audit_state state; | |
687 | ||
688 | if (likely(!audit_enabled)) | |
689 | return 0; /* Return if not auditing. */ | |
690 | ||
691 | state = audit_filter_task(tsk); | |
692 | if (likely(state == AUDIT_DISABLED)) | |
693 | return 0; | |
694 | ||
695 | if (!(context = audit_alloc_context(state))) { | |
696 | audit_log_lost("out of memory in audit_alloc"); | |
697 | return -ENOMEM; | |
698 | } | |
699 | ||
700 | /* Preserve login uid */ | |
701 | context->loginuid = -1; | |
702 | if (current->audit_context) | |
703 | context->loginuid = current->audit_context->loginuid; | |
704 | ||
705 | tsk->audit_context = context; | |
706 | set_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT); | |
707 | return 0; | |
708 | } | |
709 | ||
710 | static inline void audit_free_context(struct audit_context *context) | |
711 | { | |
712 | struct audit_context *previous; | |
713 | int count = 0; | |
714 | ||
715 | do { | |
716 | previous = context->previous; | |
717 | if (previous || (count && count < 10)) { | |
718 | ++count; | |
719 | printk(KERN_ERR "audit(:%d): major=%d name_count=%d:" | |
720 | " freeing multiple contexts (%d)\n", | |
721 | context->serial, context->major, | |
722 | context->name_count, count); | |
723 | } | |
724 | audit_free_names(context); | |
725 | audit_free_aux(context); | |
5adc8a6a | 726 | kfree(context->filterkey); |
1da177e4 LT |
727 | kfree(context); |
728 | context = previous; | |
729 | } while (context); | |
730 | if (count >= 10) | |
731 | printk(KERN_ERR "audit: freed %d contexts\n", count); | |
732 | } | |
733 | ||
161a09e7 | 734 | void audit_log_task_context(struct audit_buffer *ab) |
8c8570fb DK |
735 | { |
736 | char *ctx = NULL; | |
737 | ssize_t len = 0; | |
738 | ||
739 | len = security_getprocattr(current, "current", NULL, 0); | |
740 | if (len < 0) { | |
741 | if (len != -EINVAL) | |
742 | goto error_path; | |
743 | return; | |
744 | } | |
745 | ||
e495149b | 746 | ctx = kmalloc(len, GFP_KERNEL); |
7306a0b9 | 747 | if (!ctx) |
8c8570fb | 748 | goto error_path; |
8c8570fb DK |
749 | |
750 | len = security_getprocattr(current, "current", ctx, len); | |
751 | if (len < 0 ) | |
752 | goto error_path; | |
753 | ||
754 | audit_log_format(ab, " subj=%s", ctx); | |
7306a0b9 | 755 | return; |
8c8570fb DK |
756 | |
757 | error_path: | |
9a66a53f | 758 | kfree(ctx); |
7306a0b9 | 759 | audit_panic("error in audit_log_task_context"); |
8c8570fb DK |
760 | return; |
761 | } | |
762 | ||
161a09e7 JL |
763 | EXPORT_SYMBOL(audit_log_task_context); |
764 | ||
e495149b | 765 | static void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk) |
219f0817 | 766 | { |
45d9bb0e AV |
767 | char name[sizeof(tsk->comm)]; |
768 | struct mm_struct *mm = tsk->mm; | |
219f0817 SS |
769 | struct vm_area_struct *vma; |
770 | ||
e495149b AV |
771 | /* tsk == current */ |
772 | ||
45d9bb0e | 773 | get_task_comm(name, tsk); |
99e45eea DW |
774 | audit_log_format(ab, " comm="); |
775 | audit_log_untrustedstring(ab, name); | |
219f0817 | 776 | |
e495149b AV |
777 | if (mm) { |
778 | down_read(&mm->mmap_sem); | |
779 | vma = mm->mmap; | |
780 | while (vma) { | |
781 | if ((vma->vm_flags & VM_EXECUTABLE) && | |
782 | vma->vm_file) { | |
783 | audit_log_d_path(ab, "exe=", | |
a7a005fd JS |
784 | vma->vm_file->f_path.dentry, |
785 | vma->vm_file->f_path.mnt); | |
e495149b AV |
786 | break; |
787 | } | |
788 | vma = vma->vm_next; | |
219f0817 | 789 | } |
e495149b | 790 | up_read(&mm->mmap_sem); |
219f0817 | 791 | } |
e495149b | 792 | audit_log_task_context(ab); |
219f0817 SS |
793 | } |
794 | ||
e495149b | 795 | static void audit_log_exit(struct audit_context *context, struct task_struct *tsk) |
1da177e4 | 796 | { |
9c7aa6aa | 797 | int i, call_panic = 0; |
1da177e4 | 798 | struct audit_buffer *ab; |
7551ced3 | 799 | struct audit_aux_data *aux; |
a6c043a8 | 800 | const char *tty; |
1da177e4 | 801 | |
e495149b | 802 | /* tsk == current */ |
3f2792ff | 803 | context->pid = tsk->pid; |
419c58f1 AV |
804 | if (!context->ppid) |
805 | context->ppid = sys_getppid(); | |
3f2792ff AV |
806 | context->uid = tsk->uid; |
807 | context->gid = tsk->gid; | |
808 | context->euid = tsk->euid; | |
809 | context->suid = tsk->suid; | |
810 | context->fsuid = tsk->fsuid; | |
811 | context->egid = tsk->egid; | |
812 | context->sgid = tsk->sgid; | |
813 | context->fsgid = tsk->fsgid; | |
814 | context->personality = tsk->personality; | |
e495149b AV |
815 | |
816 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_SYSCALL); | |
1da177e4 LT |
817 | if (!ab) |
818 | return; /* audit_panic has been called */ | |
bccf6ae0 DW |
819 | audit_log_format(ab, "arch=%x syscall=%d", |
820 | context->arch, context->major); | |
1da177e4 LT |
821 | if (context->personality != PER_LINUX) |
822 | audit_log_format(ab, " per=%lx", context->personality); | |
823 | if (context->return_valid) | |
2fd6f58b DW |
824 | audit_log_format(ab, " success=%s exit=%ld", |
825 | (context->return_valid==AUDITSC_SUCCESS)?"yes":"no", | |
826 | context->return_code); | |
eb84a20e AC |
827 | |
828 | mutex_lock(&tty_mutex); | |
24ec839c | 829 | read_lock(&tasklist_lock); |
45d9bb0e AV |
830 | if (tsk->signal && tsk->signal->tty && tsk->signal->tty->name) |
831 | tty = tsk->signal->tty->name; | |
a6c043a8 SG |
832 | else |
833 | tty = "(none)"; | |
24ec839c | 834 | read_unlock(&tasklist_lock); |
1da177e4 LT |
835 | audit_log_format(ab, |
836 | " a0=%lx a1=%lx a2=%lx a3=%lx items=%d" | |
f46038ff | 837 | " ppid=%d pid=%d auid=%u uid=%u gid=%u" |
326e9c8b | 838 | " euid=%u suid=%u fsuid=%u" |
a6c043a8 | 839 | " egid=%u sgid=%u fsgid=%u tty=%s", |
1da177e4 LT |
840 | context->argv[0], |
841 | context->argv[1], | |
842 | context->argv[2], | |
843 | context->argv[3], | |
844 | context->name_count, | |
f46038ff | 845 | context->ppid, |
1da177e4 LT |
846 | context->pid, |
847 | context->loginuid, | |
848 | context->uid, | |
849 | context->gid, | |
850 | context->euid, context->suid, context->fsuid, | |
a6c043a8 | 851 | context->egid, context->sgid, context->fsgid, tty); |
eb84a20e AC |
852 | |
853 | mutex_unlock(&tty_mutex); | |
854 | ||
e495149b | 855 | audit_log_task_info(ab, tsk); |
5adc8a6a AG |
856 | if (context->filterkey) { |
857 | audit_log_format(ab, " key="); | |
858 | audit_log_untrustedstring(ab, context->filterkey); | |
859 | } else | |
860 | audit_log_format(ab, " key=(null)"); | |
1da177e4 | 861 | audit_log_end(ab); |
1da177e4 | 862 | |
7551ced3 | 863 | for (aux = context->aux; aux; aux = aux->next) { |
c0404993 | 864 | |
e495149b | 865 | ab = audit_log_start(context, GFP_KERNEL, aux->type); |
1da177e4 LT |
866 | if (!ab) |
867 | continue; /* audit_panic has been called */ | |
868 | ||
1da177e4 | 869 | switch (aux->type) { |
20ca73bc GW |
870 | case AUDIT_MQ_OPEN: { |
871 | struct audit_aux_data_mq_open *axi = (void *)aux; | |
872 | audit_log_format(ab, | |
873 | "oflag=0x%x mode=%#o mq_flags=0x%lx mq_maxmsg=%ld " | |
874 | "mq_msgsize=%ld mq_curmsgs=%ld", | |
875 | axi->oflag, axi->mode, axi->attr.mq_flags, | |
876 | axi->attr.mq_maxmsg, axi->attr.mq_msgsize, | |
877 | axi->attr.mq_curmsgs); | |
878 | break; } | |
879 | ||
880 | case AUDIT_MQ_SENDRECV: { | |
881 | struct audit_aux_data_mq_sendrecv *axi = (void *)aux; | |
882 | audit_log_format(ab, | |
883 | "mqdes=%d msg_len=%zd msg_prio=%u " | |
884 | "abs_timeout_sec=%ld abs_timeout_nsec=%ld", | |
885 | axi->mqdes, axi->msg_len, axi->msg_prio, | |
886 | axi->abs_timeout.tv_sec, axi->abs_timeout.tv_nsec); | |
887 | break; } | |
888 | ||
889 | case AUDIT_MQ_NOTIFY: { | |
890 | struct audit_aux_data_mq_notify *axi = (void *)aux; | |
891 | audit_log_format(ab, | |
892 | "mqdes=%d sigev_signo=%d", | |
893 | axi->mqdes, | |
894 | axi->notification.sigev_signo); | |
895 | break; } | |
896 | ||
897 | case AUDIT_MQ_GETSETATTR: { | |
898 | struct audit_aux_data_mq_getsetattr *axi = (void *)aux; | |
899 | audit_log_format(ab, | |
900 | "mqdes=%d mq_flags=0x%lx mq_maxmsg=%ld mq_msgsize=%ld " | |
901 | "mq_curmsgs=%ld ", | |
902 | axi->mqdes, | |
903 | axi->mqstat.mq_flags, axi->mqstat.mq_maxmsg, | |
904 | axi->mqstat.mq_msgsize, axi->mqstat.mq_curmsgs); | |
905 | break; } | |
906 | ||
c0404993 | 907 | case AUDIT_IPC: { |
1da177e4 LT |
908 | struct audit_aux_data_ipcctl *axi = (void *)aux; |
909 | audit_log_format(ab, | |
ac03221a LK |
910 | "ouid=%u ogid=%u mode=%x", |
911 | axi->uid, axi->gid, axi->mode); | |
9c7aa6aa SG |
912 | if (axi->osid != 0) { |
913 | char *ctx = NULL; | |
914 | u32 len; | |
1a70cd40 | 915 | if (selinux_sid_to_string( |
9c7aa6aa | 916 | axi->osid, &ctx, &len)) { |
ce29b682 | 917 | audit_log_format(ab, " osid=%u", |
9c7aa6aa SG |
918 | axi->osid); |
919 | call_panic = 1; | |
920 | } else | |
921 | audit_log_format(ab, " obj=%s", ctx); | |
922 | kfree(ctx); | |
923 | } | |
3ec3b2fb DW |
924 | break; } |
925 | ||
073115d6 SG |
926 | case AUDIT_IPC_SET_PERM: { |
927 | struct audit_aux_data_ipcctl *axi = (void *)aux; | |
928 | audit_log_format(ab, | |
ac03221a | 929 | "qbytes=%lx ouid=%u ogid=%u mode=%x", |
073115d6 | 930 | axi->qbytes, axi->uid, axi->gid, axi->mode); |
073115d6 | 931 | break; } |
ac03221a | 932 | |
473ae30b AV |
933 | case AUDIT_EXECVE: { |
934 | struct audit_aux_data_execve *axi = (void *)aux; | |
935 | int i; | |
936 | const char *p; | |
937 | for (i = 0, p = axi->mem; i < axi->argc; i++) { | |
938 | audit_log_format(ab, "a%d=", i); | |
939 | p = audit_log_untrustedstring(ab, p); | |
940 | audit_log_format(ab, "\n"); | |
941 | } | |
942 | break; } | |
073115d6 | 943 | |
3ec3b2fb DW |
944 | case AUDIT_SOCKETCALL: { |
945 | int i; | |
946 | struct audit_aux_data_socketcall *axs = (void *)aux; | |
947 | audit_log_format(ab, "nargs=%d", axs->nargs); | |
948 | for (i=0; i<axs->nargs; i++) | |
949 | audit_log_format(ab, " a%d=%lx", i, axs->args[i]); | |
950 | break; } | |
951 | ||
952 | case AUDIT_SOCKADDR: { | |
953 | struct audit_aux_data_sockaddr *axs = (void *)aux; | |
954 | ||
955 | audit_log_format(ab, "saddr="); | |
956 | audit_log_hex(ab, axs->a, axs->len); | |
957 | break; } | |
01116105 SS |
958 | |
959 | case AUDIT_AVC_PATH: { | |
960 | struct audit_aux_data_path *axi = (void *)aux; | |
961 | audit_log_d_path(ab, "path=", axi->dentry, axi->mnt); | |
01116105 SS |
962 | break; } |
963 | ||
1da177e4 LT |
964 | } |
965 | audit_log_end(ab); | |
1da177e4 LT |
966 | } |
967 | ||
8f37d47c | 968 | if (context->pwd && context->pwdmnt) { |
e495149b | 969 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD); |
8f37d47c DW |
970 | if (ab) { |
971 | audit_log_d_path(ab, "cwd=", context->pwd, context->pwdmnt); | |
972 | audit_log_end(ab); | |
973 | } | |
974 | } | |
1da177e4 | 975 | for (i = 0; i < context->name_count; i++) { |
9c937dcc | 976 | struct audit_names *n = &context->names[i]; |
73241ccc | 977 | |
e495149b | 978 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_PATH); |
1da177e4 LT |
979 | if (!ab) |
980 | continue; /* audit_panic has been called */ | |
8f37d47c | 981 | |
1da177e4 | 982 | audit_log_format(ab, "item=%d", i); |
73241ccc | 983 | |
9c937dcc AG |
984 | if (n->name) { |
985 | switch(n->name_len) { | |
986 | case AUDIT_NAME_FULL: | |
987 | /* log the full path */ | |
988 | audit_log_format(ab, " name="); | |
989 | audit_log_untrustedstring(ab, n->name); | |
990 | break; | |
991 | case 0: | |
992 | /* name was specified as a relative path and the | |
993 | * directory component is the cwd */ | |
994 | audit_log_d_path(ab, " name=", context->pwd, | |
995 | context->pwdmnt); | |
996 | break; | |
997 | default: | |
998 | /* log the name's directory component */ | |
999 | audit_log_format(ab, " name="); | |
1000 | audit_log_n_untrustedstring(ab, n->name_len, | |
1001 | n->name); | |
1002 | } | |
1003 | } else | |
1004 | audit_log_format(ab, " name=(null)"); | |
1005 | ||
1006 | if (n->ino != (unsigned long)-1) { | |
1007 | audit_log_format(ab, " inode=%lu" | |
1008 | " dev=%02x:%02x mode=%#o" | |
1009 | " ouid=%u ogid=%u rdev=%02x:%02x", | |
1010 | n->ino, | |
1011 | MAJOR(n->dev), | |
1012 | MINOR(n->dev), | |
1013 | n->mode, | |
1014 | n->uid, | |
1015 | n->gid, | |
1016 | MAJOR(n->rdev), | |
1017 | MINOR(n->rdev)); | |
1018 | } | |
1019 | if (n->osid != 0) { | |
1b50eed9 SG |
1020 | char *ctx = NULL; |
1021 | u32 len; | |
1a70cd40 | 1022 | if (selinux_sid_to_string( |
9c937dcc AG |
1023 | n->osid, &ctx, &len)) { |
1024 | audit_log_format(ab, " osid=%u", n->osid); | |
9c7aa6aa | 1025 | call_panic = 2; |
1b50eed9 SG |
1026 | } else |
1027 | audit_log_format(ab, " obj=%s", ctx); | |
1028 | kfree(ctx); | |
8c8570fb DK |
1029 | } |
1030 | ||
1da177e4 LT |
1031 | audit_log_end(ab); |
1032 | } | |
9c7aa6aa SG |
1033 | if (call_panic) |
1034 | audit_panic("error converting sid to string"); | |
1da177e4 LT |
1035 | } |
1036 | ||
b0dd25a8 RD |
1037 | /** |
1038 | * audit_free - free a per-task audit context | |
1039 | * @tsk: task whose audit context block to free | |
1040 | * | |
fa84cb93 | 1041 | * Called from copy_process and do_exit |
b0dd25a8 | 1042 | */ |
1da177e4 LT |
1043 | void audit_free(struct task_struct *tsk) |
1044 | { | |
1045 | struct audit_context *context; | |
1046 | ||
1da177e4 | 1047 | context = audit_get_context(tsk, 0, 0); |
1da177e4 LT |
1048 | if (likely(!context)) |
1049 | return; | |
1050 | ||
1051 | /* Check for system calls that do not go through the exit | |
f5561964 DW |
1052 | * function (e.g., exit_group), then free context block. |
1053 | * We use GFP_ATOMIC here because we might be doing this | |
1054 | * in the context of the idle thread */ | |
e495149b | 1055 | /* that can happen only if we are called from do_exit() */ |
f7056d64 | 1056 | if (context->in_syscall && context->auditable) |
e495149b | 1057 | audit_log_exit(context, tsk); |
1da177e4 LT |
1058 | |
1059 | audit_free_context(context); | |
1060 | } | |
1061 | ||
b0dd25a8 RD |
1062 | /** |
1063 | * audit_syscall_entry - fill in an audit record at syscall entry | |
1064 | * @tsk: task being audited | |
1065 | * @arch: architecture type | |
1066 | * @major: major syscall type (function) | |
1067 | * @a1: additional syscall register 1 | |
1068 | * @a2: additional syscall register 2 | |
1069 | * @a3: additional syscall register 3 | |
1070 | * @a4: additional syscall register 4 | |
1071 | * | |
1072 | * Fill in audit context at syscall entry. This only happens if the | |
1da177e4 LT |
1073 | * audit context was created when the task was created and the state or |
1074 | * filters demand the audit context be built. If the state from the | |
1075 | * per-task filter or from the per-syscall filter is AUDIT_RECORD_CONTEXT, | |
1076 | * then the record will be written at syscall exit time (otherwise, it | |
1077 | * will only be written if another part of the kernel requests that it | |
b0dd25a8 RD |
1078 | * be written). |
1079 | */ | |
5411be59 | 1080 | void audit_syscall_entry(int arch, int major, |
1da177e4 LT |
1081 | unsigned long a1, unsigned long a2, |
1082 | unsigned long a3, unsigned long a4) | |
1083 | { | |
5411be59 | 1084 | struct task_struct *tsk = current; |
1da177e4 LT |
1085 | struct audit_context *context = tsk->audit_context; |
1086 | enum audit_state state; | |
1087 | ||
1088 | BUG_ON(!context); | |
1089 | ||
b0dd25a8 RD |
1090 | /* |
1091 | * This happens only on certain architectures that make system | |
1da177e4 LT |
1092 | * calls in kernel_thread via the entry.S interface, instead of |
1093 | * with direct calls. (If you are porting to a new | |
1094 | * architecture, hitting this condition can indicate that you | |
1095 | * got the _exit/_leave calls backward in entry.S.) | |
1096 | * | |
1097 | * i386 no | |
1098 | * x86_64 no | |
2ef9481e | 1099 | * ppc64 yes (see arch/powerpc/platforms/iseries/misc.S) |
1da177e4 LT |
1100 | * |
1101 | * This also happens with vm86 emulation in a non-nested manner | |
1102 | * (entries without exits), so this case must be caught. | |
1103 | */ | |
1104 | if (context->in_syscall) { | |
1105 | struct audit_context *newctx; | |
1106 | ||
1da177e4 LT |
1107 | #if AUDIT_DEBUG |
1108 | printk(KERN_ERR | |
1109 | "audit(:%d) pid=%d in syscall=%d;" | |
1110 | " entering syscall=%d\n", | |
1111 | context->serial, tsk->pid, context->major, major); | |
1112 | #endif | |
1113 | newctx = audit_alloc_context(context->state); | |
1114 | if (newctx) { | |
1115 | newctx->previous = context; | |
1116 | context = newctx; | |
1117 | tsk->audit_context = newctx; | |
1118 | } else { | |
1119 | /* If we can't alloc a new context, the best we | |
1120 | * can do is to leak memory (any pending putname | |
1121 | * will be lost). The only other alternative is | |
1122 | * to abandon auditing. */ | |
1123 | audit_zero_context(context, context->state); | |
1124 | } | |
1125 | } | |
1126 | BUG_ON(context->in_syscall || context->name_count); | |
1127 | ||
1128 | if (!audit_enabled) | |
1129 | return; | |
1130 | ||
2fd6f58b | 1131 | context->arch = arch; |
1da177e4 LT |
1132 | context->major = major; |
1133 | context->argv[0] = a1; | |
1134 | context->argv[1] = a2; | |
1135 | context->argv[2] = a3; | |
1136 | context->argv[3] = a4; | |
1137 | ||
1138 | state = context->state; | |
d51374ad AV |
1139 | context->dummy = !audit_n_rules; |
1140 | if (!context->dummy && (state == AUDIT_SETUP_CONTEXT || state == AUDIT_BUILD_CONTEXT)) | |
0f45aa18 | 1141 | state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_ENTRY]); |
1da177e4 LT |
1142 | if (likely(state == AUDIT_DISABLED)) |
1143 | return; | |
1144 | ||
ce625a80 | 1145 | context->serial = 0; |
1da177e4 LT |
1146 | context->ctime = CURRENT_TIME; |
1147 | context->in_syscall = 1; | |
1148 | context->auditable = !!(state == AUDIT_RECORD_CONTEXT); | |
419c58f1 | 1149 | context->ppid = 0; |
1da177e4 LT |
1150 | } |
1151 | ||
b0dd25a8 RD |
1152 | /** |
1153 | * audit_syscall_exit - deallocate audit context after a system call | |
1154 | * @tsk: task being audited | |
1155 | * @valid: success/failure flag | |
1156 | * @return_code: syscall return value | |
1157 | * | |
1158 | * Tear down after system call. If the audit context has been marked as | |
1da177e4 LT |
1159 | * auditable (either because of the AUDIT_RECORD_CONTEXT state from |
1160 | * filtering, or because some other part of the kernel write an audit | |
1161 | * message), then write out the syscall information. In call cases, | |
b0dd25a8 RD |
1162 | * free the names stored from getname(). |
1163 | */ | |
5411be59 | 1164 | void audit_syscall_exit(int valid, long return_code) |
1da177e4 | 1165 | { |
5411be59 | 1166 | struct task_struct *tsk = current; |
1da177e4 LT |
1167 | struct audit_context *context; |
1168 | ||
2fd6f58b | 1169 | context = audit_get_context(tsk, valid, return_code); |
1da177e4 | 1170 | |
1da177e4 | 1171 | if (likely(!context)) |
97e94c45 | 1172 | return; |
1da177e4 | 1173 | |
f7056d64 | 1174 | if (context->in_syscall && context->auditable) |
e495149b | 1175 | audit_log_exit(context, tsk); |
1da177e4 LT |
1176 | |
1177 | context->in_syscall = 0; | |
1178 | context->auditable = 0; | |
2fd6f58b | 1179 | |
1da177e4 LT |
1180 | if (context->previous) { |
1181 | struct audit_context *new_context = context->previous; | |
1182 | context->previous = NULL; | |
1183 | audit_free_context(context); | |
1184 | tsk->audit_context = new_context; | |
1185 | } else { | |
1186 | audit_free_names(context); | |
1187 | audit_free_aux(context); | |
5adc8a6a AG |
1188 | kfree(context->filterkey); |
1189 | context->filterkey = NULL; | |
1da177e4 LT |
1190 | tsk->audit_context = context; |
1191 | } | |
1da177e4 LT |
1192 | } |
1193 | ||
b0dd25a8 RD |
1194 | /** |
1195 | * audit_getname - add a name to the list | |
1196 | * @name: name to add | |
1197 | * | |
1198 | * Add a name to the list of audit names for this context. | |
1199 | * Called from fs/namei.c:getname(). | |
1200 | */ | |
d8945bb5 | 1201 | void __audit_getname(const char *name) |
1da177e4 LT |
1202 | { |
1203 | struct audit_context *context = current->audit_context; | |
1204 | ||
d8945bb5 | 1205 | if (IS_ERR(name) || !name) |
1da177e4 LT |
1206 | return; |
1207 | ||
1208 | if (!context->in_syscall) { | |
1209 | #if AUDIT_DEBUG == 2 | |
1210 | printk(KERN_ERR "%s:%d(:%d): ignoring getname(%p)\n", | |
1211 | __FILE__, __LINE__, context->serial, name); | |
1212 | dump_stack(); | |
1213 | #endif | |
1214 | return; | |
1215 | } | |
1216 | BUG_ON(context->name_count >= AUDIT_NAMES); | |
1217 | context->names[context->name_count].name = name; | |
9c937dcc AG |
1218 | context->names[context->name_count].name_len = AUDIT_NAME_FULL; |
1219 | context->names[context->name_count].name_put = 1; | |
1da177e4 LT |
1220 | context->names[context->name_count].ino = (unsigned long)-1; |
1221 | ++context->name_count; | |
8f37d47c DW |
1222 | if (!context->pwd) { |
1223 | read_lock(¤t->fs->lock); | |
1224 | context->pwd = dget(current->fs->pwd); | |
1225 | context->pwdmnt = mntget(current->fs->pwdmnt); | |
1226 | read_unlock(¤t->fs->lock); | |
1227 | } | |
1228 | ||
1da177e4 LT |
1229 | } |
1230 | ||
b0dd25a8 RD |
1231 | /* audit_putname - intercept a putname request |
1232 | * @name: name to intercept and delay for putname | |
1233 | * | |
1234 | * If we have stored the name from getname in the audit context, | |
1235 | * then we delay the putname until syscall exit. | |
1236 | * Called from include/linux/fs.h:putname(). | |
1237 | */ | |
1da177e4 LT |
1238 | void audit_putname(const char *name) |
1239 | { | |
1240 | struct audit_context *context = current->audit_context; | |
1241 | ||
1242 | BUG_ON(!context); | |
1243 | if (!context->in_syscall) { | |
1244 | #if AUDIT_DEBUG == 2 | |
1245 | printk(KERN_ERR "%s:%d(:%d): __putname(%p)\n", | |
1246 | __FILE__, __LINE__, context->serial, name); | |
1247 | if (context->name_count) { | |
1248 | int i; | |
1249 | for (i = 0; i < context->name_count; i++) | |
1250 | printk(KERN_ERR "name[%d] = %p = %s\n", i, | |
1251 | context->names[i].name, | |
73241ccc | 1252 | context->names[i].name ?: "(null)"); |
1da177e4 LT |
1253 | } |
1254 | #endif | |
1255 | __putname(name); | |
1256 | } | |
1257 | #if AUDIT_DEBUG | |
1258 | else { | |
1259 | ++context->put_count; | |
1260 | if (context->put_count > context->name_count) { | |
1261 | printk(KERN_ERR "%s:%d(:%d): major=%d" | |
1262 | " in_syscall=%d putname(%p) name_count=%d" | |
1263 | " put_count=%d\n", | |
1264 | __FILE__, __LINE__, | |
1265 | context->serial, context->major, | |
1266 | context->in_syscall, name, context->name_count, | |
1267 | context->put_count); | |
1268 | dump_stack(); | |
1269 | } | |
1270 | } | |
1271 | #endif | |
1272 | } | |
1273 | ||
3e2efce0 AG |
1274 | /* Copy inode data into an audit_names. */ |
1275 | static void audit_copy_inode(struct audit_names *name, const struct inode *inode) | |
8c8570fb | 1276 | { |
3e2efce0 AG |
1277 | name->ino = inode->i_ino; |
1278 | name->dev = inode->i_sb->s_dev; | |
1279 | name->mode = inode->i_mode; | |
1280 | name->uid = inode->i_uid; | |
1281 | name->gid = inode->i_gid; | |
1282 | name->rdev = inode->i_rdev; | |
1283 | selinux_get_inode_sid(inode, &name->osid); | |
8c8570fb DK |
1284 | } |
1285 | ||
b0dd25a8 RD |
1286 | /** |
1287 | * audit_inode - store the inode and device from a lookup | |
1288 | * @name: name being audited | |
1289 | * @inode: inode being audited | |
b0dd25a8 RD |
1290 | * |
1291 | * Called from fs/namei.c:path_lookup(). | |
1292 | */ | |
9c937dcc | 1293 | void __audit_inode(const char *name, const struct inode *inode) |
1da177e4 LT |
1294 | { |
1295 | int idx; | |
1296 | struct audit_context *context = current->audit_context; | |
1297 | ||
1298 | if (!context->in_syscall) | |
1299 | return; | |
1300 | if (context->name_count | |
1301 | && context->names[context->name_count-1].name | |
1302 | && context->names[context->name_count-1].name == name) | |
1303 | idx = context->name_count - 1; | |
1304 | else if (context->name_count > 1 | |
1305 | && context->names[context->name_count-2].name | |
1306 | && context->names[context->name_count-2].name == name) | |
1307 | idx = context->name_count - 2; | |
1308 | else { | |
1309 | /* FIXME: how much do we care about inodes that have no | |
1310 | * associated name? */ | |
1311 | if (context->name_count >= AUDIT_NAMES - AUDIT_NAMES_RESERVED) | |
1312 | return; | |
1313 | idx = context->name_count++; | |
1314 | context->names[idx].name = NULL; | |
1315 | #if AUDIT_DEBUG | |
1316 | ++context->ino_count; | |
1317 | #endif | |
1318 | } | |
3e2efce0 | 1319 | audit_copy_inode(&context->names[idx], inode); |
73241ccc AG |
1320 | } |
1321 | ||
1322 | /** | |
1323 | * audit_inode_child - collect inode info for created/removed objects | |
1324 | * @dname: inode's dentry name | |
1325 | * @inode: inode being audited | |
73d3ec5a | 1326 | * @parent: inode of dentry parent |
73241ccc AG |
1327 | * |
1328 | * For syscalls that create or remove filesystem objects, audit_inode | |
1329 | * can only collect information for the filesystem object's parent. | |
1330 | * This call updates the audit context with the child's information. | |
1331 | * Syscalls that create a new filesystem object must be hooked after | |
1332 | * the object is created. Syscalls that remove a filesystem object | |
1333 | * must be hooked prior, in order to capture the target inode during | |
1334 | * unsuccessful attempts. | |
1335 | */ | |
1336 | void __audit_inode_child(const char *dname, const struct inode *inode, | |
73d3ec5a | 1337 | const struct inode *parent) |
73241ccc AG |
1338 | { |
1339 | int idx; | |
1340 | struct audit_context *context = current->audit_context; | |
9c937dcc AG |
1341 | const char *found_name = NULL; |
1342 | int dirlen = 0; | |
73241ccc AG |
1343 | |
1344 | if (!context->in_syscall) | |
1345 | return; | |
1346 | ||
1347 | /* determine matching parent */ | |
f368c07d | 1348 | if (!dname) |
9c937dcc | 1349 | goto update_context; |
f368c07d | 1350 | for (idx = 0; idx < context->name_count; idx++) |
73d3ec5a | 1351 | if (context->names[idx].ino == parent->i_ino) { |
f368c07d | 1352 | const char *name = context->names[idx].name; |
73241ccc | 1353 | |
f368c07d AG |
1354 | if (!name) |
1355 | continue; | |
1356 | ||
9c937dcc AG |
1357 | if (audit_compare_dname_path(dname, name, &dirlen) == 0) { |
1358 | context->names[idx].name_len = dirlen; | |
1359 | found_name = name; | |
1360 | break; | |
1361 | } | |
f368c07d | 1362 | } |
73241ccc | 1363 | |
9c937dcc | 1364 | update_context: |
ac9910ce SG |
1365 | idx = context->name_count; |
1366 | if (context->name_count == AUDIT_NAMES) { | |
1367 | printk(KERN_DEBUG "name_count maxed and losing %s\n", | |
1368 | found_name ?: "(null)"); | |
1369 | return; | |
1370 | } | |
1371 | context->name_count++; | |
73241ccc AG |
1372 | #if AUDIT_DEBUG |
1373 | context->ino_count++; | |
1374 | #endif | |
9c937dcc AG |
1375 | /* Re-use the name belonging to the slot for a matching parent directory. |
1376 | * All names for this context are relinquished in audit_free_names() */ | |
1377 | context->names[idx].name = found_name; | |
1378 | context->names[idx].name_len = AUDIT_NAME_FULL; | |
1379 | context->names[idx].name_put = 0; /* don't call __putname() */ | |
73241ccc | 1380 | |
3e2efce0 AG |
1381 | if (!inode) |
1382 | context->names[idx].ino = (unsigned long)-1; | |
1383 | else | |
1384 | audit_copy_inode(&context->names[idx], inode); | |
73d3ec5a AG |
1385 | |
1386 | /* A parent was not found in audit_names, so copy the inode data for the | |
1387 | * provided parent. */ | |
1388 | if (!found_name) { | |
ac9910ce SG |
1389 | idx = context->name_count; |
1390 | if (context->name_count == AUDIT_NAMES) { | |
1391 | printk(KERN_DEBUG | |
1392 | "name_count maxed and losing parent inode data: dev=%02x:%02x, inode=%lu", | |
1393 | MAJOR(parent->i_sb->s_dev), | |
1394 | MINOR(parent->i_sb->s_dev), | |
1395 | parent->i_ino); | |
1396 | return; | |
1397 | } | |
1398 | context->name_count++; | |
73d3ec5a AG |
1399 | #if AUDIT_DEBUG |
1400 | context->ino_count++; | |
1401 | #endif | |
1402 | audit_copy_inode(&context->names[idx], parent); | |
1403 | } | |
3e2efce0 AG |
1404 | } |
1405 | ||
1406 | /** | |
1407 | * audit_inode_update - update inode info for last collected name | |
1408 | * @inode: inode being audited | |
1409 | * | |
1410 | * When open() is called on an existing object with the O_CREAT flag, the inode | |
1411 | * data audit initially collects is incorrect. This additional hook ensures | |
1412 | * audit has the inode data for the actual object to be opened. | |
1413 | */ | |
1414 | void __audit_inode_update(const struct inode *inode) | |
1415 | { | |
1416 | struct audit_context *context = current->audit_context; | |
1417 | int idx; | |
1418 | ||
1419 | if (!context->in_syscall || !inode) | |
1420 | return; | |
1421 | ||
1422 | if (context->name_count == 0) { | |
1423 | context->name_count++; | |
1424 | #if AUDIT_DEBUG | |
1425 | context->ino_count++; | |
1426 | #endif | |
1427 | } | |
1428 | idx = context->name_count - 1; | |
1429 | ||
1430 | audit_copy_inode(&context->names[idx], inode); | |
1da177e4 LT |
1431 | } |
1432 | ||
b0dd25a8 RD |
1433 | /** |
1434 | * auditsc_get_stamp - get local copies of audit_context values | |
1435 | * @ctx: audit_context for the task | |
1436 | * @t: timespec to store time recorded in the audit_context | |
1437 | * @serial: serial value that is recorded in the audit_context | |
1438 | * | |
1439 | * Also sets the context as auditable. | |
1440 | */ | |
bfb4496e DW |
1441 | void auditsc_get_stamp(struct audit_context *ctx, |
1442 | struct timespec *t, unsigned int *serial) | |
1da177e4 | 1443 | { |
ce625a80 DW |
1444 | if (!ctx->serial) |
1445 | ctx->serial = audit_serial(); | |
bfb4496e DW |
1446 | t->tv_sec = ctx->ctime.tv_sec; |
1447 | t->tv_nsec = ctx->ctime.tv_nsec; | |
1448 | *serial = ctx->serial; | |
1449 | ctx->auditable = 1; | |
1da177e4 LT |
1450 | } |
1451 | ||
b0dd25a8 RD |
1452 | /** |
1453 | * audit_set_loginuid - set a task's audit_context loginuid | |
1454 | * @task: task whose audit context is being modified | |
1455 | * @loginuid: loginuid value | |
1456 | * | |
1457 | * Returns 0. | |
1458 | * | |
1459 | * Called (set) from fs/proc/base.c::proc_loginuid_write(). | |
1460 | */ | |
456be6cd | 1461 | int audit_set_loginuid(struct task_struct *task, uid_t loginuid) |
1da177e4 | 1462 | { |
41757106 SG |
1463 | struct audit_context *context = task->audit_context; |
1464 | ||
1465 | if (context) { | |
1466 | /* Only log if audit is enabled */ | |
1467 | if (context->in_syscall) { | |
1468 | struct audit_buffer *ab; | |
1469 | ||
1470 | ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_LOGIN); | |
1471 | if (ab) { | |
1472 | audit_log_format(ab, "login pid=%d uid=%u " | |
1473 | "old auid=%u new auid=%u", | |
1474 | task->pid, task->uid, | |
1475 | context->loginuid, loginuid); | |
1476 | audit_log_end(ab); | |
1477 | } | |
c0404993 | 1478 | } |
41757106 | 1479 | context->loginuid = loginuid; |
1da177e4 LT |
1480 | } |
1481 | return 0; | |
1482 | } | |
1483 | ||
b0dd25a8 RD |
1484 | /** |
1485 | * audit_get_loginuid - get the loginuid for an audit_context | |
1486 | * @ctx: the audit_context | |
1487 | * | |
1488 | * Returns the context's loginuid or -1 if @ctx is NULL. | |
1489 | */ | |
1da177e4 LT |
1490 | uid_t audit_get_loginuid(struct audit_context *ctx) |
1491 | { | |
1492 | return ctx ? ctx->loginuid : -1; | |
1493 | } | |
1494 | ||
161a09e7 JL |
1495 | EXPORT_SYMBOL(audit_get_loginuid); |
1496 | ||
20ca73bc GW |
1497 | /** |
1498 | * __audit_mq_open - record audit data for a POSIX MQ open | |
1499 | * @oflag: open flag | |
1500 | * @mode: mode bits | |
1501 | * @u_attr: queue attributes | |
1502 | * | |
1503 | * Returns 0 for success or NULL context or < 0 on error. | |
1504 | */ | |
1505 | int __audit_mq_open(int oflag, mode_t mode, struct mq_attr __user *u_attr) | |
1506 | { | |
1507 | struct audit_aux_data_mq_open *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_attr != NULL) { | |
1521 | if (copy_from_user(&ax->attr, u_attr, sizeof(ax->attr))) { | |
1522 | kfree(ax); | |
1523 | return -EFAULT; | |
1524 | } | |
1525 | } else | |
1526 | memset(&ax->attr, 0, sizeof(ax->attr)); | |
1527 | ||
1528 | ax->oflag = oflag; | |
1529 | ax->mode = mode; | |
1530 | ||
1531 | ax->d.type = AUDIT_MQ_OPEN; | |
1532 | ax->d.next = context->aux; | |
1533 | context->aux = (void *)ax; | |
1534 | return 0; | |
1535 | } | |
1536 | ||
1537 | /** | |
1538 | * __audit_mq_timedsend - record audit data for a POSIX MQ timed send | |
1539 | * @mqdes: MQ descriptor | |
1540 | * @msg_len: Message length | |
1541 | * @msg_prio: Message priority | |
1dbe83c3 | 1542 | * @u_abs_timeout: Message timeout in absolute time |
20ca73bc GW |
1543 | * |
1544 | * Returns 0 for success or NULL context or < 0 on error. | |
1545 | */ | |
1546 | int __audit_mq_timedsend(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, | |
1547 | const struct timespec __user *u_abs_timeout) | |
1548 | { | |
1549 | struct audit_aux_data_mq_sendrecv *ax; | |
1550 | struct audit_context *context = current->audit_context; | |
1551 | ||
1552 | if (!audit_enabled) | |
1553 | return 0; | |
1554 | ||
1555 | if (likely(!context)) | |
1556 | return 0; | |
1557 | ||
1558 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1559 | if (!ax) | |
1560 | return -ENOMEM; | |
1561 | ||
1562 | if (u_abs_timeout != NULL) { | |
1563 | if (copy_from_user(&ax->abs_timeout, u_abs_timeout, sizeof(ax->abs_timeout))) { | |
1564 | kfree(ax); | |
1565 | return -EFAULT; | |
1566 | } | |
1567 | } else | |
1568 | memset(&ax->abs_timeout, 0, sizeof(ax->abs_timeout)); | |
1569 | ||
1570 | ax->mqdes = mqdes; | |
1571 | ax->msg_len = msg_len; | |
1572 | ax->msg_prio = msg_prio; | |
1573 | ||
1574 | ax->d.type = AUDIT_MQ_SENDRECV; | |
1575 | ax->d.next = context->aux; | |
1576 | context->aux = (void *)ax; | |
1577 | return 0; | |
1578 | } | |
1579 | ||
1580 | /** | |
1581 | * __audit_mq_timedreceive - record audit data for a POSIX MQ timed receive | |
1582 | * @mqdes: MQ descriptor | |
1583 | * @msg_len: Message length | |
1dbe83c3 RD |
1584 | * @u_msg_prio: Message priority |
1585 | * @u_abs_timeout: Message timeout in absolute time | |
20ca73bc GW |
1586 | * |
1587 | * Returns 0 for success or NULL context or < 0 on error. | |
1588 | */ | |
1589 | int __audit_mq_timedreceive(mqd_t mqdes, size_t msg_len, | |
1590 | unsigned int __user *u_msg_prio, | |
1591 | const struct timespec __user *u_abs_timeout) | |
1592 | { | |
1593 | struct audit_aux_data_mq_sendrecv *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 | if (u_msg_prio != NULL) { | |
1607 | if (get_user(ax->msg_prio, u_msg_prio)) { | |
1608 | kfree(ax); | |
1609 | return -EFAULT; | |
1610 | } | |
1611 | } else | |
1612 | ax->msg_prio = 0; | |
1613 | ||
1614 | if (u_abs_timeout != NULL) { | |
1615 | if (copy_from_user(&ax->abs_timeout, u_abs_timeout, sizeof(ax->abs_timeout))) { | |
1616 | kfree(ax); | |
1617 | return -EFAULT; | |
1618 | } | |
1619 | } else | |
1620 | memset(&ax->abs_timeout, 0, sizeof(ax->abs_timeout)); | |
1621 | ||
1622 | ax->mqdes = mqdes; | |
1623 | ax->msg_len = msg_len; | |
1624 | ||
1625 | ax->d.type = AUDIT_MQ_SENDRECV; | |
1626 | ax->d.next = context->aux; | |
1627 | context->aux = (void *)ax; | |
1628 | return 0; | |
1629 | } | |
1630 | ||
1631 | /** | |
1632 | * __audit_mq_notify - record audit data for a POSIX MQ notify | |
1633 | * @mqdes: MQ descriptor | |
1634 | * @u_notification: Notification event | |
1635 | * | |
1636 | * Returns 0 for success or NULL context or < 0 on error. | |
1637 | */ | |
1638 | ||
1639 | int __audit_mq_notify(mqd_t mqdes, const struct sigevent __user *u_notification) | |
1640 | { | |
1641 | struct audit_aux_data_mq_notify *ax; | |
1642 | struct audit_context *context = current->audit_context; | |
1643 | ||
1644 | if (!audit_enabled) | |
1645 | return 0; | |
1646 | ||
1647 | if (likely(!context)) | |
1648 | return 0; | |
1649 | ||
1650 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1651 | if (!ax) | |
1652 | return -ENOMEM; | |
1653 | ||
1654 | if (u_notification != NULL) { | |
1655 | if (copy_from_user(&ax->notification, u_notification, sizeof(ax->notification))) { | |
1656 | kfree(ax); | |
1657 | return -EFAULT; | |
1658 | } | |
1659 | } else | |
1660 | memset(&ax->notification, 0, sizeof(ax->notification)); | |
1661 | ||
1662 | ax->mqdes = mqdes; | |
1663 | ||
1664 | ax->d.type = AUDIT_MQ_NOTIFY; | |
1665 | ax->d.next = context->aux; | |
1666 | context->aux = (void *)ax; | |
1667 | return 0; | |
1668 | } | |
1669 | ||
1670 | /** | |
1671 | * __audit_mq_getsetattr - record audit data for a POSIX MQ get/set attribute | |
1672 | * @mqdes: MQ descriptor | |
1673 | * @mqstat: MQ flags | |
1674 | * | |
1675 | * Returns 0 for success or NULL context or < 0 on error. | |
1676 | */ | |
1677 | int __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat) | |
1678 | { | |
1679 | struct audit_aux_data_mq_getsetattr *ax; | |
1680 | struct audit_context *context = current->audit_context; | |
1681 | ||
1682 | if (!audit_enabled) | |
1683 | return 0; | |
1684 | ||
1685 | if (likely(!context)) | |
1686 | return 0; | |
1687 | ||
1688 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1689 | if (!ax) | |
1690 | return -ENOMEM; | |
1691 | ||
1692 | ax->mqdes = mqdes; | |
1693 | ax->mqstat = *mqstat; | |
1694 | ||
1695 | ax->d.type = AUDIT_MQ_GETSETATTR; | |
1696 | ax->d.next = context->aux; | |
1697 | context->aux = (void *)ax; | |
1698 | return 0; | |
1699 | } | |
1700 | ||
b0dd25a8 | 1701 | /** |
073115d6 SG |
1702 | * audit_ipc_obj - record audit data for ipc object |
1703 | * @ipcp: ipc permissions | |
1704 | * | |
1705 | * Returns 0 for success or NULL context or < 0 on error. | |
1706 | */ | |
d8945bb5 | 1707 | int __audit_ipc_obj(struct kern_ipc_perm *ipcp) |
073115d6 SG |
1708 | { |
1709 | struct audit_aux_data_ipcctl *ax; | |
1710 | struct audit_context *context = current->audit_context; | |
1711 | ||
073115d6 SG |
1712 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); |
1713 | if (!ax) | |
1714 | return -ENOMEM; | |
1715 | ||
1716 | ax->uid = ipcp->uid; | |
1717 | ax->gid = ipcp->gid; | |
1718 | ax->mode = ipcp->mode; | |
1719 | selinux_get_ipc_sid(ipcp, &ax->osid); | |
1720 | ||
1721 | ax->d.type = AUDIT_IPC; | |
1722 | ax->d.next = context->aux; | |
1723 | context->aux = (void *)ax; | |
1724 | return 0; | |
1725 | } | |
1726 | ||
1727 | /** | |
1728 | * audit_ipc_set_perm - record audit data for new ipc permissions | |
b0dd25a8 RD |
1729 | * @qbytes: msgq bytes |
1730 | * @uid: msgq user id | |
1731 | * @gid: msgq group id | |
1732 | * @mode: msgq mode (permissions) | |
1733 | * | |
1734 | * Returns 0 for success or NULL context or < 0 on error. | |
1735 | */ | |
d8945bb5 | 1736 | int __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode) |
1da177e4 LT |
1737 | { |
1738 | struct audit_aux_data_ipcctl *ax; | |
1739 | struct audit_context *context = current->audit_context; | |
1740 | ||
8c8570fb | 1741 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); |
1da177e4 LT |
1742 | if (!ax) |
1743 | return -ENOMEM; | |
1744 | ||
1745 | ax->qbytes = qbytes; | |
1746 | ax->uid = uid; | |
1747 | ax->gid = gid; | |
1748 | ax->mode = mode; | |
1749 | ||
073115d6 | 1750 | ax->d.type = AUDIT_IPC_SET_PERM; |
1da177e4 LT |
1751 | ax->d.next = context->aux; |
1752 | context->aux = (void *)ax; | |
1753 | return 0; | |
1754 | } | |
c2f0c7c3 | 1755 | |
473ae30b AV |
1756 | int audit_bprm(struct linux_binprm *bprm) |
1757 | { | |
1758 | struct audit_aux_data_execve *ax; | |
1759 | struct audit_context *context = current->audit_context; | |
1760 | unsigned long p, next; | |
1761 | void *to; | |
1762 | ||
5ac3a9c2 | 1763 | if (likely(!audit_enabled || !context || context->dummy)) |
473ae30b AV |
1764 | return 0; |
1765 | ||
1766 | ax = kmalloc(sizeof(*ax) + PAGE_SIZE * MAX_ARG_PAGES - bprm->p, | |
1767 | GFP_KERNEL); | |
1768 | if (!ax) | |
1769 | return -ENOMEM; | |
1770 | ||
1771 | ax->argc = bprm->argc; | |
1772 | ax->envc = bprm->envc; | |
1773 | for (p = bprm->p, to = ax->mem; p < MAX_ARG_PAGES*PAGE_SIZE; p = next) { | |
1774 | struct page *page = bprm->page[p / PAGE_SIZE]; | |
1775 | void *kaddr = kmap(page); | |
1776 | next = (p + PAGE_SIZE) & ~(PAGE_SIZE - 1); | |
1777 | memcpy(to, kaddr + (p & (PAGE_SIZE - 1)), next - p); | |
1778 | to += next - p; | |
1779 | kunmap(page); | |
1780 | } | |
1781 | ||
1782 | ax->d.type = AUDIT_EXECVE; | |
1783 | ax->d.next = context->aux; | |
1784 | context->aux = (void *)ax; | |
1785 | return 0; | |
1786 | } | |
1787 | ||
1788 | ||
b0dd25a8 RD |
1789 | /** |
1790 | * audit_socketcall - record audit data for sys_socketcall | |
1791 | * @nargs: number of args | |
1792 | * @args: args array | |
1793 | * | |
1794 | * Returns 0 for success or NULL context or < 0 on error. | |
1795 | */ | |
3ec3b2fb DW |
1796 | int audit_socketcall(int nargs, unsigned long *args) |
1797 | { | |
1798 | struct audit_aux_data_socketcall *ax; | |
1799 | struct audit_context *context = current->audit_context; | |
1800 | ||
5ac3a9c2 | 1801 | if (likely(!context || context->dummy)) |
3ec3b2fb DW |
1802 | return 0; |
1803 | ||
1804 | ax = kmalloc(sizeof(*ax) + nargs * sizeof(unsigned long), GFP_KERNEL); | |
1805 | if (!ax) | |
1806 | return -ENOMEM; | |
1807 | ||
1808 | ax->nargs = nargs; | |
1809 | memcpy(ax->args, args, nargs * sizeof(unsigned long)); | |
1810 | ||
1811 | ax->d.type = AUDIT_SOCKETCALL; | |
1812 | ax->d.next = context->aux; | |
1813 | context->aux = (void *)ax; | |
1814 | return 0; | |
1815 | } | |
1816 | ||
b0dd25a8 RD |
1817 | /** |
1818 | * audit_sockaddr - record audit data for sys_bind, sys_connect, sys_sendto | |
1819 | * @len: data length in user space | |
1820 | * @a: data address in kernel space | |
1821 | * | |
1822 | * Returns 0 for success or NULL context or < 0 on error. | |
1823 | */ | |
3ec3b2fb DW |
1824 | int audit_sockaddr(int len, void *a) |
1825 | { | |
1826 | struct audit_aux_data_sockaddr *ax; | |
1827 | struct audit_context *context = current->audit_context; | |
1828 | ||
5ac3a9c2 | 1829 | if (likely(!context || context->dummy)) |
3ec3b2fb DW |
1830 | return 0; |
1831 | ||
1832 | ax = kmalloc(sizeof(*ax) + len, GFP_KERNEL); | |
1833 | if (!ax) | |
1834 | return -ENOMEM; | |
1835 | ||
1836 | ax->len = len; | |
1837 | memcpy(ax->a, a, len); | |
1838 | ||
1839 | ax->d.type = AUDIT_SOCKADDR; | |
1840 | ax->d.next = context->aux; | |
1841 | context->aux = (void *)ax; | |
1842 | return 0; | |
1843 | } | |
1844 | ||
b0dd25a8 RD |
1845 | /** |
1846 | * audit_avc_path - record the granting or denial of permissions | |
1847 | * @dentry: dentry to record | |
1848 | * @mnt: mnt to record | |
1849 | * | |
1850 | * Returns 0 for success or NULL context or < 0 on error. | |
1851 | * | |
1852 | * Called from security/selinux/avc.c::avc_audit() | |
1853 | */ | |
01116105 SS |
1854 | int audit_avc_path(struct dentry *dentry, struct vfsmount *mnt) |
1855 | { | |
1856 | struct audit_aux_data_path *ax; | |
1857 | struct audit_context *context = current->audit_context; | |
1858 | ||
1859 | if (likely(!context)) | |
1860 | return 0; | |
1861 | ||
1862 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1863 | if (!ax) | |
1864 | return -ENOMEM; | |
1865 | ||
1866 | ax->dentry = dget(dentry); | |
1867 | ax->mnt = mntget(mnt); | |
1868 | ||
1869 | ax->d.type = AUDIT_AVC_PATH; | |
1870 | ax->d.next = context->aux; | |
1871 | context->aux = (void *)ax; | |
1872 | return 0; | |
1873 | } | |
1874 | ||
b0dd25a8 RD |
1875 | /** |
1876 | * audit_signal_info - record signal info for shutting down audit subsystem | |
1877 | * @sig: signal value | |
1878 | * @t: task being signaled | |
1879 | * | |
1880 | * If the audit subsystem is being terminated, record the task (pid) | |
1881 | * and uid that is doing that. | |
1882 | */ | |
e1396065 | 1883 | void __audit_signal_info(int sig, struct task_struct *t) |
c2f0c7c3 SG |
1884 | { |
1885 | extern pid_t audit_sig_pid; | |
1886 | extern uid_t audit_sig_uid; | |
e1396065 AV |
1887 | extern u32 audit_sig_sid; |
1888 | ||
1889 | if (sig == SIGTERM || sig == SIGHUP || sig == SIGUSR1) { | |
1890 | struct task_struct *tsk = current; | |
1891 | struct audit_context *ctx = tsk->audit_context; | |
1892 | audit_sig_pid = tsk->pid; | |
1893 | if (ctx) | |
1894 | audit_sig_uid = ctx->loginuid; | |
1895 | else | |
1896 | audit_sig_uid = tsk->uid; | |
1897 | selinux_get_task_sid(tsk, &audit_sig_sid); | |
c2f0c7c3 SG |
1898 | } |
1899 | } |