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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 | ||
db349509 AV |
173 | struct audit_aux_data_fd_pair { |
174 | struct audit_aux_data d; | |
175 | int fd[2]; | |
176 | }; | |
177 | ||
01116105 SS |
178 | struct audit_aux_data_path { |
179 | struct audit_aux_data d; | |
180 | struct dentry *dentry; | |
181 | struct vfsmount *mnt; | |
182 | }; | |
1da177e4 LT |
183 | |
184 | /* The per-task audit context. */ | |
185 | struct audit_context { | |
d51374ad | 186 | int dummy; /* must be the first element */ |
1da177e4 LT |
187 | int in_syscall; /* 1 if task is in a syscall */ |
188 | enum audit_state state; | |
189 | unsigned int serial; /* serial number for record */ | |
190 | struct timespec ctime; /* time of syscall entry */ | |
191 | uid_t loginuid; /* login uid (identity) */ | |
192 | int major; /* syscall number */ | |
193 | unsigned long argv[4]; /* syscall arguments */ | |
194 | int return_valid; /* return code is valid */ | |
2fd6f58b | 195 | long return_code;/* syscall return code */ |
1da177e4 LT |
196 | int auditable; /* 1 if record should be written */ |
197 | int name_count; | |
198 | struct audit_names names[AUDIT_NAMES]; | |
5adc8a6a | 199 | char * filterkey; /* key for rule that triggered record */ |
8f37d47c DW |
200 | struct dentry * pwd; |
201 | struct vfsmount * pwdmnt; | |
1da177e4 LT |
202 | struct audit_context *previous; /* For nested syscalls */ |
203 | struct audit_aux_data *aux; | |
204 | ||
205 | /* Save things to print about task_struct */ | |
f46038ff | 206 | pid_t pid, ppid; |
1da177e4 LT |
207 | uid_t uid, euid, suid, fsuid; |
208 | gid_t gid, egid, sgid, fsgid; | |
209 | unsigned long personality; | |
2fd6f58b | 210 | int arch; |
1da177e4 LT |
211 | |
212 | #if AUDIT_DEBUG | |
213 | int put_count; | |
214 | int ino_count; | |
215 | #endif | |
216 | }; | |
217 | ||
55669bfa AV |
218 | #define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE]) |
219 | static inline int open_arg(int flags, int mask) | |
220 | { | |
221 | int n = ACC_MODE(flags); | |
222 | if (flags & (O_TRUNC | O_CREAT)) | |
223 | n |= AUDIT_PERM_WRITE; | |
224 | return n & mask; | |
225 | } | |
226 | ||
227 | static int audit_match_perm(struct audit_context *ctx, int mask) | |
228 | { | |
229 | unsigned n = ctx->major; | |
230 | switch (audit_classify_syscall(ctx->arch, n)) { | |
231 | case 0: /* native */ | |
232 | if ((mask & AUDIT_PERM_WRITE) && | |
233 | audit_match_class(AUDIT_CLASS_WRITE, n)) | |
234 | return 1; | |
235 | if ((mask & AUDIT_PERM_READ) && | |
236 | audit_match_class(AUDIT_CLASS_READ, n)) | |
237 | return 1; | |
238 | if ((mask & AUDIT_PERM_ATTR) && | |
239 | audit_match_class(AUDIT_CLASS_CHATTR, n)) | |
240 | return 1; | |
241 | return 0; | |
242 | case 1: /* 32bit on biarch */ | |
243 | if ((mask & AUDIT_PERM_WRITE) && | |
244 | audit_match_class(AUDIT_CLASS_WRITE_32, n)) | |
245 | return 1; | |
246 | if ((mask & AUDIT_PERM_READ) && | |
247 | audit_match_class(AUDIT_CLASS_READ_32, n)) | |
248 | return 1; | |
249 | if ((mask & AUDIT_PERM_ATTR) && | |
250 | audit_match_class(AUDIT_CLASS_CHATTR_32, n)) | |
251 | return 1; | |
252 | return 0; | |
253 | case 2: /* open */ | |
254 | return mask & ACC_MODE(ctx->argv[1]); | |
255 | case 3: /* openat */ | |
256 | return mask & ACC_MODE(ctx->argv[2]); | |
257 | case 4: /* socketcall */ | |
258 | return ((mask & AUDIT_PERM_WRITE) && ctx->argv[0] == SYS_BIND); | |
259 | case 5: /* execve */ | |
260 | return mask & AUDIT_PERM_EXEC; | |
261 | default: | |
262 | return 0; | |
263 | } | |
264 | } | |
265 | ||
f368c07d | 266 | /* Determine if any context name data matches a rule's watch data */ |
1da177e4 LT |
267 | /* Compare a task_struct with an audit_rule. Return 1 on match, 0 |
268 | * otherwise. */ | |
269 | static int audit_filter_rules(struct task_struct *tsk, | |
93315ed6 | 270 | struct audit_krule *rule, |
1da177e4 | 271 | struct audit_context *ctx, |
f368c07d | 272 | struct audit_names *name, |
1da177e4 LT |
273 | enum audit_state *state) |
274 | { | |
2ad312d2 | 275 | int i, j, need_sid = 1; |
3dc7e315 DG |
276 | u32 sid; |
277 | ||
1da177e4 | 278 | for (i = 0; i < rule->field_count; i++) { |
93315ed6 | 279 | struct audit_field *f = &rule->fields[i]; |
1da177e4 LT |
280 | int result = 0; |
281 | ||
93315ed6 | 282 | switch (f->type) { |
1da177e4 | 283 | case AUDIT_PID: |
93315ed6 | 284 | result = audit_comparator(tsk->pid, f->op, f->val); |
1da177e4 | 285 | break; |
3c66251e | 286 | case AUDIT_PPID: |
419c58f1 AV |
287 | if (ctx) { |
288 | if (!ctx->ppid) | |
289 | ctx->ppid = sys_getppid(); | |
3c66251e | 290 | result = audit_comparator(ctx->ppid, f->op, f->val); |
419c58f1 | 291 | } |
3c66251e | 292 | break; |
1da177e4 | 293 | case AUDIT_UID: |
93315ed6 | 294 | result = audit_comparator(tsk->uid, f->op, f->val); |
1da177e4 LT |
295 | break; |
296 | case AUDIT_EUID: | |
93315ed6 | 297 | result = audit_comparator(tsk->euid, f->op, f->val); |
1da177e4 LT |
298 | break; |
299 | case AUDIT_SUID: | |
93315ed6 | 300 | result = audit_comparator(tsk->suid, f->op, f->val); |
1da177e4 LT |
301 | break; |
302 | case AUDIT_FSUID: | |
93315ed6 | 303 | result = audit_comparator(tsk->fsuid, f->op, f->val); |
1da177e4 LT |
304 | break; |
305 | case AUDIT_GID: | |
93315ed6 | 306 | result = audit_comparator(tsk->gid, f->op, f->val); |
1da177e4 LT |
307 | break; |
308 | case AUDIT_EGID: | |
93315ed6 | 309 | result = audit_comparator(tsk->egid, f->op, f->val); |
1da177e4 LT |
310 | break; |
311 | case AUDIT_SGID: | |
93315ed6 | 312 | result = audit_comparator(tsk->sgid, f->op, f->val); |
1da177e4 LT |
313 | break; |
314 | case AUDIT_FSGID: | |
93315ed6 | 315 | result = audit_comparator(tsk->fsgid, f->op, f->val); |
1da177e4 LT |
316 | break; |
317 | case AUDIT_PERS: | |
93315ed6 | 318 | result = audit_comparator(tsk->personality, f->op, f->val); |
1da177e4 | 319 | break; |
2fd6f58b | 320 | case AUDIT_ARCH: |
b63862f4 | 321 | if (ctx) |
93315ed6 | 322 | result = audit_comparator(ctx->arch, f->op, f->val); |
2fd6f58b | 323 | break; |
1da177e4 LT |
324 | |
325 | case AUDIT_EXIT: | |
326 | if (ctx && ctx->return_valid) | |
93315ed6 | 327 | result = audit_comparator(ctx->return_code, f->op, f->val); |
1da177e4 LT |
328 | break; |
329 | case AUDIT_SUCCESS: | |
b01f2cc1 | 330 | if (ctx && ctx->return_valid) { |
93315ed6 AG |
331 | if (f->val) |
332 | result = audit_comparator(ctx->return_valid, f->op, AUDITSC_SUCCESS); | |
b01f2cc1 | 333 | else |
93315ed6 | 334 | result = audit_comparator(ctx->return_valid, f->op, AUDITSC_FAILURE); |
b01f2cc1 | 335 | } |
1da177e4 LT |
336 | break; |
337 | case AUDIT_DEVMAJOR: | |
f368c07d AG |
338 | if (name) |
339 | result = audit_comparator(MAJOR(name->dev), | |
340 | f->op, f->val); | |
341 | else if (ctx) { | |
1da177e4 | 342 | for (j = 0; j < ctx->name_count; j++) { |
93315ed6 | 343 | if (audit_comparator(MAJOR(ctx->names[j].dev), f->op, f->val)) { |
1da177e4 LT |
344 | ++result; |
345 | break; | |
346 | } | |
347 | } | |
348 | } | |
349 | break; | |
350 | case AUDIT_DEVMINOR: | |
f368c07d AG |
351 | if (name) |
352 | result = audit_comparator(MINOR(name->dev), | |
353 | f->op, f->val); | |
354 | else if (ctx) { | |
1da177e4 | 355 | for (j = 0; j < ctx->name_count; j++) { |
93315ed6 | 356 | if (audit_comparator(MINOR(ctx->names[j].dev), f->op, f->val)) { |
1da177e4 LT |
357 | ++result; |
358 | break; | |
359 | } | |
360 | } | |
361 | } | |
362 | break; | |
363 | case AUDIT_INODE: | |
f368c07d | 364 | if (name) |
9c937dcc | 365 | result = (name->ino == f->val); |
f368c07d | 366 | else if (ctx) { |
1da177e4 | 367 | for (j = 0; j < ctx->name_count; j++) { |
9c937dcc | 368 | if (audit_comparator(ctx->names[j].ino, f->op, f->val)) { |
1da177e4 LT |
369 | ++result; |
370 | break; | |
371 | } | |
372 | } | |
373 | } | |
374 | break; | |
f368c07d AG |
375 | case AUDIT_WATCH: |
376 | if (name && rule->watch->ino != (unsigned long)-1) | |
377 | result = (name->dev == rule->watch->dev && | |
9c937dcc | 378 | name->ino == rule->watch->ino); |
f368c07d | 379 | break; |
1da177e4 LT |
380 | case AUDIT_LOGINUID: |
381 | result = 0; | |
382 | if (ctx) | |
93315ed6 | 383 | result = audit_comparator(ctx->loginuid, f->op, f->val); |
1da177e4 | 384 | break; |
3a6b9f85 DG |
385 | case AUDIT_SUBJ_USER: |
386 | case AUDIT_SUBJ_ROLE: | |
387 | case AUDIT_SUBJ_TYPE: | |
388 | case AUDIT_SUBJ_SEN: | |
389 | case AUDIT_SUBJ_CLR: | |
3dc7e315 DG |
390 | /* NOTE: this may return negative values indicating |
391 | a temporary error. We simply treat this as a | |
392 | match for now to avoid losing information that | |
393 | may be wanted. An error message will also be | |
394 | logged upon error */ | |
2ad312d2 SG |
395 | if (f->se_rule) { |
396 | if (need_sid) { | |
62bac018 | 397 | selinux_get_task_sid(tsk, &sid); |
2ad312d2 SG |
398 | need_sid = 0; |
399 | } | |
3dc7e315 DG |
400 | result = selinux_audit_rule_match(sid, f->type, |
401 | f->op, | |
402 | f->se_rule, | |
403 | ctx); | |
2ad312d2 | 404 | } |
3dc7e315 | 405 | break; |
6e5a2d1d DG |
406 | case AUDIT_OBJ_USER: |
407 | case AUDIT_OBJ_ROLE: | |
408 | case AUDIT_OBJ_TYPE: | |
409 | case AUDIT_OBJ_LEV_LOW: | |
410 | case AUDIT_OBJ_LEV_HIGH: | |
411 | /* The above note for AUDIT_SUBJ_USER...AUDIT_SUBJ_CLR | |
412 | also applies here */ | |
413 | if (f->se_rule) { | |
414 | /* Find files that match */ | |
415 | if (name) { | |
416 | result = selinux_audit_rule_match( | |
417 | name->osid, f->type, f->op, | |
418 | f->se_rule, ctx); | |
419 | } else if (ctx) { | |
420 | for (j = 0; j < ctx->name_count; j++) { | |
421 | if (selinux_audit_rule_match( | |
422 | ctx->names[j].osid, | |
423 | f->type, f->op, | |
424 | f->se_rule, ctx)) { | |
425 | ++result; | |
426 | break; | |
427 | } | |
428 | } | |
429 | } | |
430 | /* Find ipc objects that match */ | |
431 | if (ctx) { | |
432 | struct audit_aux_data *aux; | |
433 | for (aux = ctx->aux; aux; | |
434 | aux = aux->next) { | |
435 | if (aux->type == AUDIT_IPC) { | |
436 | struct audit_aux_data_ipcctl *axi = (void *)aux; | |
437 | if (selinux_audit_rule_match(axi->osid, f->type, f->op, f->se_rule, ctx)) { | |
438 | ++result; | |
439 | break; | |
440 | } | |
441 | } | |
442 | } | |
443 | } | |
444 | } | |
445 | break; | |
1da177e4 LT |
446 | case AUDIT_ARG0: |
447 | case AUDIT_ARG1: | |
448 | case AUDIT_ARG2: | |
449 | case AUDIT_ARG3: | |
450 | if (ctx) | |
93315ed6 | 451 | result = audit_comparator(ctx->argv[f->type-AUDIT_ARG0], f->op, f->val); |
1da177e4 | 452 | break; |
5adc8a6a AG |
453 | case AUDIT_FILTERKEY: |
454 | /* ignore this field for filtering */ | |
455 | result = 1; | |
456 | break; | |
55669bfa AV |
457 | case AUDIT_PERM: |
458 | result = audit_match_perm(ctx, f->val); | |
459 | break; | |
1da177e4 LT |
460 | } |
461 | ||
1da177e4 LT |
462 | if (!result) |
463 | return 0; | |
464 | } | |
5adc8a6a AG |
465 | if (rule->filterkey) |
466 | ctx->filterkey = kstrdup(rule->filterkey, GFP_ATOMIC); | |
1da177e4 LT |
467 | switch (rule->action) { |
468 | case AUDIT_NEVER: *state = AUDIT_DISABLED; break; | |
1da177e4 LT |
469 | case AUDIT_ALWAYS: *state = AUDIT_RECORD_CONTEXT; break; |
470 | } | |
471 | return 1; | |
472 | } | |
473 | ||
474 | /* At process creation time, we can determine if system-call auditing is | |
475 | * completely disabled for this task. Since we only have the task | |
476 | * structure at this point, we can only check uid and gid. | |
477 | */ | |
478 | static enum audit_state audit_filter_task(struct task_struct *tsk) | |
479 | { | |
480 | struct audit_entry *e; | |
481 | enum audit_state state; | |
482 | ||
483 | rcu_read_lock(); | |
0f45aa18 | 484 | list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_TASK], list) { |
f368c07d | 485 | if (audit_filter_rules(tsk, &e->rule, NULL, NULL, &state)) { |
1da177e4 LT |
486 | rcu_read_unlock(); |
487 | return state; | |
488 | } | |
489 | } | |
490 | rcu_read_unlock(); | |
491 | return AUDIT_BUILD_CONTEXT; | |
492 | } | |
493 | ||
494 | /* At syscall entry and exit time, this filter is called if the | |
495 | * audit_state is not low enough that auditing cannot take place, but is | |
23f32d18 | 496 | * also not high enough that we already know we have to write an audit |
b0dd25a8 | 497 | * record (i.e., the state is AUDIT_SETUP_CONTEXT or AUDIT_BUILD_CONTEXT). |
1da177e4 LT |
498 | */ |
499 | static enum audit_state audit_filter_syscall(struct task_struct *tsk, | |
500 | struct audit_context *ctx, | |
501 | struct list_head *list) | |
502 | { | |
503 | struct audit_entry *e; | |
c3896495 | 504 | enum audit_state state; |
1da177e4 | 505 | |
351bb722 | 506 | if (audit_pid && tsk->tgid == audit_pid) |
f7056d64 DW |
507 | return AUDIT_DISABLED; |
508 | ||
1da177e4 | 509 | rcu_read_lock(); |
c3896495 | 510 | if (!list_empty(list)) { |
b63862f4 DK |
511 | int word = AUDIT_WORD(ctx->major); |
512 | int bit = AUDIT_BIT(ctx->major); | |
513 | ||
514 | list_for_each_entry_rcu(e, list, list) { | |
f368c07d AG |
515 | if ((e->rule.mask[word] & bit) == bit && |
516 | audit_filter_rules(tsk, &e->rule, ctx, NULL, | |
517 | &state)) { | |
518 | rcu_read_unlock(); | |
519 | return state; | |
520 | } | |
521 | } | |
522 | } | |
523 | rcu_read_unlock(); | |
524 | return AUDIT_BUILD_CONTEXT; | |
525 | } | |
526 | ||
527 | /* At syscall exit time, this filter is called if any audit_names[] have been | |
528 | * collected during syscall processing. We only check rules in sublists at hash | |
529 | * buckets applicable to the inode numbers in audit_names[]. | |
530 | * Regarding audit_state, same rules apply as for audit_filter_syscall(). | |
531 | */ | |
532 | enum audit_state audit_filter_inodes(struct task_struct *tsk, | |
533 | struct audit_context *ctx) | |
534 | { | |
535 | int i; | |
536 | struct audit_entry *e; | |
537 | enum audit_state state; | |
538 | ||
539 | if (audit_pid && tsk->tgid == audit_pid) | |
540 | return AUDIT_DISABLED; | |
541 | ||
542 | rcu_read_lock(); | |
543 | for (i = 0; i < ctx->name_count; i++) { | |
544 | int word = AUDIT_WORD(ctx->major); | |
545 | int bit = AUDIT_BIT(ctx->major); | |
546 | struct audit_names *n = &ctx->names[i]; | |
547 | int h = audit_hash_ino((u32)n->ino); | |
548 | struct list_head *list = &audit_inode_hash[h]; | |
549 | ||
550 | if (list_empty(list)) | |
551 | continue; | |
552 | ||
553 | list_for_each_entry_rcu(e, list, list) { | |
554 | if ((e->rule.mask[word] & bit) == bit && | |
555 | audit_filter_rules(tsk, &e->rule, ctx, n, &state)) { | |
b63862f4 DK |
556 | rcu_read_unlock(); |
557 | return state; | |
558 | } | |
0f45aa18 DW |
559 | } |
560 | } | |
561 | rcu_read_unlock(); | |
1da177e4 | 562 | return AUDIT_BUILD_CONTEXT; |
0f45aa18 DW |
563 | } |
564 | ||
f368c07d AG |
565 | void audit_set_auditable(struct audit_context *ctx) |
566 | { | |
567 | ctx->auditable = 1; | |
568 | } | |
569 | ||
1da177e4 LT |
570 | static inline struct audit_context *audit_get_context(struct task_struct *tsk, |
571 | int return_valid, | |
572 | int return_code) | |
573 | { | |
574 | struct audit_context *context = tsk->audit_context; | |
575 | ||
576 | if (likely(!context)) | |
577 | return NULL; | |
578 | context->return_valid = return_valid; | |
579 | context->return_code = return_code; | |
580 | ||
d51374ad | 581 | if (context->in_syscall && !context->dummy && !context->auditable) { |
1da177e4 | 582 | enum audit_state state; |
f368c07d | 583 | |
0f45aa18 | 584 | state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_EXIT]); |
f368c07d AG |
585 | if (state == AUDIT_RECORD_CONTEXT) { |
586 | context->auditable = 1; | |
587 | goto get_context; | |
588 | } | |
589 | ||
590 | state = audit_filter_inodes(tsk, context); | |
1da177e4 LT |
591 | if (state == AUDIT_RECORD_CONTEXT) |
592 | context->auditable = 1; | |
f368c07d | 593 | |
1da177e4 LT |
594 | } |
595 | ||
f368c07d | 596 | get_context: |
3f2792ff | 597 | |
1da177e4 LT |
598 | tsk->audit_context = NULL; |
599 | return context; | |
600 | } | |
601 | ||
602 | static inline void audit_free_names(struct audit_context *context) | |
603 | { | |
604 | int i; | |
605 | ||
606 | #if AUDIT_DEBUG == 2 | |
607 | if (context->auditable | |
608 | ||context->put_count + context->ino_count != context->name_count) { | |
73241ccc | 609 | printk(KERN_ERR "%s:%d(:%d): major=%d in_syscall=%d" |
1da177e4 LT |
610 | " name_count=%d put_count=%d" |
611 | " ino_count=%d [NOT freeing]\n", | |
73241ccc | 612 | __FILE__, __LINE__, |
1da177e4 LT |
613 | context->serial, context->major, context->in_syscall, |
614 | context->name_count, context->put_count, | |
615 | context->ino_count); | |
8c8570fb | 616 | for (i = 0; i < context->name_count; i++) { |
1da177e4 LT |
617 | printk(KERN_ERR "names[%d] = %p = %s\n", i, |
618 | context->names[i].name, | |
73241ccc | 619 | context->names[i].name ?: "(null)"); |
8c8570fb | 620 | } |
1da177e4 LT |
621 | dump_stack(); |
622 | return; | |
623 | } | |
624 | #endif | |
625 | #if AUDIT_DEBUG | |
626 | context->put_count = 0; | |
627 | context->ino_count = 0; | |
628 | #endif | |
629 | ||
8c8570fb | 630 | for (i = 0; i < context->name_count; i++) { |
9c937dcc | 631 | if (context->names[i].name && context->names[i].name_put) |
1da177e4 | 632 | __putname(context->names[i].name); |
8c8570fb | 633 | } |
1da177e4 | 634 | context->name_count = 0; |
8f37d47c DW |
635 | if (context->pwd) |
636 | dput(context->pwd); | |
637 | if (context->pwdmnt) | |
638 | mntput(context->pwdmnt); | |
639 | context->pwd = NULL; | |
640 | context->pwdmnt = NULL; | |
1da177e4 LT |
641 | } |
642 | ||
643 | static inline void audit_free_aux(struct audit_context *context) | |
644 | { | |
645 | struct audit_aux_data *aux; | |
646 | ||
647 | while ((aux = context->aux)) { | |
01116105 SS |
648 | if (aux->type == AUDIT_AVC_PATH) { |
649 | struct audit_aux_data_path *axi = (void *)aux; | |
650 | dput(axi->dentry); | |
651 | mntput(axi->mnt); | |
652 | } | |
8c8570fb | 653 | |
1da177e4 LT |
654 | context->aux = aux->next; |
655 | kfree(aux); | |
656 | } | |
657 | } | |
658 | ||
659 | static inline void audit_zero_context(struct audit_context *context, | |
660 | enum audit_state state) | |
661 | { | |
662 | uid_t loginuid = context->loginuid; | |
663 | ||
664 | memset(context, 0, sizeof(*context)); | |
665 | context->state = state; | |
666 | context->loginuid = loginuid; | |
667 | } | |
668 | ||
669 | static inline struct audit_context *audit_alloc_context(enum audit_state state) | |
670 | { | |
671 | struct audit_context *context; | |
672 | ||
673 | if (!(context = kmalloc(sizeof(*context), GFP_KERNEL))) | |
674 | return NULL; | |
675 | audit_zero_context(context, state); | |
676 | return context; | |
677 | } | |
678 | ||
b0dd25a8 RD |
679 | /** |
680 | * audit_alloc - allocate an audit context block for a task | |
681 | * @tsk: task | |
682 | * | |
683 | * Filter on the task information and allocate a per-task audit context | |
1da177e4 LT |
684 | * if necessary. Doing so turns on system call auditing for the |
685 | * specified task. This is called from copy_process, so no lock is | |
b0dd25a8 RD |
686 | * needed. |
687 | */ | |
1da177e4 LT |
688 | int audit_alloc(struct task_struct *tsk) |
689 | { | |
690 | struct audit_context *context; | |
691 | enum audit_state state; | |
692 | ||
693 | if (likely(!audit_enabled)) | |
694 | return 0; /* Return if not auditing. */ | |
695 | ||
696 | state = audit_filter_task(tsk); | |
697 | if (likely(state == AUDIT_DISABLED)) | |
698 | return 0; | |
699 | ||
700 | if (!(context = audit_alloc_context(state))) { | |
701 | audit_log_lost("out of memory in audit_alloc"); | |
702 | return -ENOMEM; | |
703 | } | |
704 | ||
705 | /* Preserve login uid */ | |
706 | context->loginuid = -1; | |
707 | if (current->audit_context) | |
708 | context->loginuid = current->audit_context->loginuid; | |
709 | ||
710 | tsk->audit_context = context; | |
711 | set_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT); | |
712 | return 0; | |
713 | } | |
714 | ||
715 | static inline void audit_free_context(struct audit_context *context) | |
716 | { | |
717 | struct audit_context *previous; | |
718 | int count = 0; | |
719 | ||
720 | do { | |
721 | previous = context->previous; | |
722 | if (previous || (count && count < 10)) { | |
723 | ++count; | |
724 | printk(KERN_ERR "audit(:%d): major=%d name_count=%d:" | |
725 | " freeing multiple contexts (%d)\n", | |
726 | context->serial, context->major, | |
727 | context->name_count, count); | |
728 | } | |
729 | audit_free_names(context); | |
730 | audit_free_aux(context); | |
5adc8a6a | 731 | kfree(context->filterkey); |
1da177e4 LT |
732 | kfree(context); |
733 | context = previous; | |
734 | } while (context); | |
735 | if (count >= 10) | |
736 | printk(KERN_ERR "audit: freed %d contexts\n", count); | |
737 | } | |
738 | ||
161a09e7 | 739 | void audit_log_task_context(struct audit_buffer *ab) |
8c8570fb DK |
740 | { |
741 | char *ctx = NULL; | |
c4823bce AV |
742 | unsigned len; |
743 | int error; | |
744 | u32 sid; | |
745 | ||
746 | selinux_get_task_sid(current, &sid); | |
747 | if (!sid) | |
748 | return; | |
8c8570fb | 749 | |
c4823bce AV |
750 | error = selinux_sid_to_string(sid, &ctx, &len); |
751 | if (error) { | |
752 | if (error != -EINVAL) | |
8c8570fb DK |
753 | goto error_path; |
754 | return; | |
755 | } | |
756 | ||
8c8570fb | 757 | audit_log_format(ab, " subj=%s", ctx); |
c4823bce | 758 | kfree(ctx); |
7306a0b9 | 759 | return; |
8c8570fb DK |
760 | |
761 | error_path: | |
7306a0b9 | 762 | audit_panic("error in audit_log_task_context"); |
8c8570fb DK |
763 | return; |
764 | } | |
765 | ||
161a09e7 JL |
766 | EXPORT_SYMBOL(audit_log_task_context); |
767 | ||
e495149b | 768 | static void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk) |
219f0817 | 769 | { |
45d9bb0e AV |
770 | char name[sizeof(tsk->comm)]; |
771 | struct mm_struct *mm = tsk->mm; | |
219f0817 SS |
772 | struct vm_area_struct *vma; |
773 | ||
e495149b AV |
774 | /* tsk == current */ |
775 | ||
45d9bb0e | 776 | get_task_comm(name, tsk); |
99e45eea DW |
777 | audit_log_format(ab, " comm="); |
778 | audit_log_untrustedstring(ab, name); | |
219f0817 | 779 | |
e495149b AV |
780 | if (mm) { |
781 | down_read(&mm->mmap_sem); | |
782 | vma = mm->mmap; | |
783 | while (vma) { | |
784 | if ((vma->vm_flags & VM_EXECUTABLE) && | |
785 | vma->vm_file) { | |
786 | audit_log_d_path(ab, "exe=", | |
a7a005fd JS |
787 | vma->vm_file->f_path.dentry, |
788 | vma->vm_file->f_path.mnt); | |
e495149b AV |
789 | break; |
790 | } | |
791 | vma = vma->vm_next; | |
219f0817 | 792 | } |
e495149b | 793 | up_read(&mm->mmap_sem); |
219f0817 | 794 | } |
e495149b | 795 | audit_log_task_context(ab); |
219f0817 SS |
796 | } |
797 | ||
e495149b | 798 | static void audit_log_exit(struct audit_context *context, struct task_struct *tsk) |
1da177e4 | 799 | { |
9c7aa6aa | 800 | int i, call_panic = 0; |
1da177e4 | 801 | struct audit_buffer *ab; |
7551ced3 | 802 | struct audit_aux_data *aux; |
a6c043a8 | 803 | const char *tty; |
1da177e4 | 804 | |
e495149b | 805 | /* tsk == current */ |
3f2792ff | 806 | context->pid = tsk->pid; |
419c58f1 AV |
807 | if (!context->ppid) |
808 | context->ppid = sys_getppid(); | |
3f2792ff AV |
809 | context->uid = tsk->uid; |
810 | context->gid = tsk->gid; | |
811 | context->euid = tsk->euid; | |
812 | context->suid = tsk->suid; | |
813 | context->fsuid = tsk->fsuid; | |
814 | context->egid = tsk->egid; | |
815 | context->sgid = tsk->sgid; | |
816 | context->fsgid = tsk->fsgid; | |
817 | context->personality = tsk->personality; | |
e495149b AV |
818 | |
819 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_SYSCALL); | |
1da177e4 LT |
820 | if (!ab) |
821 | return; /* audit_panic has been called */ | |
bccf6ae0 DW |
822 | audit_log_format(ab, "arch=%x syscall=%d", |
823 | context->arch, context->major); | |
1da177e4 LT |
824 | if (context->personality != PER_LINUX) |
825 | audit_log_format(ab, " per=%lx", context->personality); | |
826 | if (context->return_valid) | |
2fd6f58b DW |
827 | audit_log_format(ab, " success=%s exit=%ld", |
828 | (context->return_valid==AUDITSC_SUCCESS)?"yes":"no", | |
829 | context->return_code); | |
eb84a20e AC |
830 | |
831 | mutex_lock(&tty_mutex); | |
24ec839c | 832 | read_lock(&tasklist_lock); |
45d9bb0e AV |
833 | if (tsk->signal && tsk->signal->tty && tsk->signal->tty->name) |
834 | tty = tsk->signal->tty->name; | |
a6c043a8 SG |
835 | else |
836 | tty = "(none)"; | |
24ec839c | 837 | read_unlock(&tasklist_lock); |
1da177e4 LT |
838 | audit_log_format(ab, |
839 | " a0=%lx a1=%lx a2=%lx a3=%lx items=%d" | |
f46038ff | 840 | " ppid=%d pid=%d auid=%u uid=%u gid=%u" |
326e9c8b | 841 | " euid=%u suid=%u fsuid=%u" |
a6c043a8 | 842 | " egid=%u sgid=%u fsgid=%u tty=%s", |
1da177e4 LT |
843 | context->argv[0], |
844 | context->argv[1], | |
845 | context->argv[2], | |
846 | context->argv[3], | |
847 | context->name_count, | |
f46038ff | 848 | context->ppid, |
1da177e4 LT |
849 | context->pid, |
850 | context->loginuid, | |
851 | context->uid, | |
852 | context->gid, | |
853 | context->euid, context->suid, context->fsuid, | |
a6c043a8 | 854 | context->egid, context->sgid, context->fsgid, tty); |
eb84a20e AC |
855 | |
856 | mutex_unlock(&tty_mutex); | |
857 | ||
e495149b | 858 | audit_log_task_info(ab, tsk); |
5adc8a6a AG |
859 | if (context->filterkey) { |
860 | audit_log_format(ab, " key="); | |
861 | audit_log_untrustedstring(ab, context->filterkey); | |
862 | } else | |
863 | audit_log_format(ab, " key=(null)"); | |
1da177e4 | 864 | audit_log_end(ab); |
1da177e4 | 865 | |
7551ced3 | 866 | for (aux = context->aux; aux; aux = aux->next) { |
c0404993 | 867 | |
e495149b | 868 | ab = audit_log_start(context, GFP_KERNEL, aux->type); |
1da177e4 LT |
869 | if (!ab) |
870 | continue; /* audit_panic has been called */ | |
871 | ||
1da177e4 | 872 | switch (aux->type) { |
20ca73bc GW |
873 | case AUDIT_MQ_OPEN: { |
874 | struct audit_aux_data_mq_open *axi = (void *)aux; | |
875 | audit_log_format(ab, | |
876 | "oflag=0x%x mode=%#o mq_flags=0x%lx mq_maxmsg=%ld " | |
877 | "mq_msgsize=%ld mq_curmsgs=%ld", | |
878 | axi->oflag, axi->mode, axi->attr.mq_flags, | |
879 | axi->attr.mq_maxmsg, axi->attr.mq_msgsize, | |
880 | axi->attr.mq_curmsgs); | |
881 | break; } | |
882 | ||
883 | case AUDIT_MQ_SENDRECV: { | |
884 | struct audit_aux_data_mq_sendrecv *axi = (void *)aux; | |
885 | audit_log_format(ab, | |
886 | "mqdes=%d msg_len=%zd msg_prio=%u " | |
887 | "abs_timeout_sec=%ld abs_timeout_nsec=%ld", | |
888 | axi->mqdes, axi->msg_len, axi->msg_prio, | |
889 | axi->abs_timeout.tv_sec, axi->abs_timeout.tv_nsec); | |
890 | break; } | |
891 | ||
892 | case AUDIT_MQ_NOTIFY: { | |
893 | struct audit_aux_data_mq_notify *axi = (void *)aux; | |
894 | audit_log_format(ab, | |
895 | "mqdes=%d sigev_signo=%d", | |
896 | axi->mqdes, | |
897 | axi->notification.sigev_signo); | |
898 | break; } | |
899 | ||
900 | case AUDIT_MQ_GETSETATTR: { | |
901 | struct audit_aux_data_mq_getsetattr *axi = (void *)aux; | |
902 | audit_log_format(ab, | |
903 | "mqdes=%d mq_flags=0x%lx mq_maxmsg=%ld mq_msgsize=%ld " | |
904 | "mq_curmsgs=%ld ", | |
905 | axi->mqdes, | |
906 | axi->mqstat.mq_flags, axi->mqstat.mq_maxmsg, | |
907 | axi->mqstat.mq_msgsize, axi->mqstat.mq_curmsgs); | |
908 | break; } | |
909 | ||
c0404993 | 910 | case AUDIT_IPC: { |
1da177e4 LT |
911 | struct audit_aux_data_ipcctl *axi = (void *)aux; |
912 | audit_log_format(ab, | |
ac03221a LK |
913 | "ouid=%u ogid=%u mode=%x", |
914 | axi->uid, axi->gid, axi->mode); | |
9c7aa6aa SG |
915 | if (axi->osid != 0) { |
916 | char *ctx = NULL; | |
917 | u32 len; | |
1a70cd40 | 918 | if (selinux_sid_to_string( |
9c7aa6aa | 919 | axi->osid, &ctx, &len)) { |
ce29b682 | 920 | audit_log_format(ab, " osid=%u", |
9c7aa6aa SG |
921 | axi->osid); |
922 | call_panic = 1; | |
923 | } else | |
924 | audit_log_format(ab, " obj=%s", ctx); | |
925 | kfree(ctx); | |
926 | } | |
3ec3b2fb DW |
927 | break; } |
928 | ||
073115d6 SG |
929 | case AUDIT_IPC_SET_PERM: { |
930 | struct audit_aux_data_ipcctl *axi = (void *)aux; | |
931 | audit_log_format(ab, | |
ac03221a | 932 | "qbytes=%lx ouid=%u ogid=%u mode=%x", |
073115d6 | 933 | axi->qbytes, axi->uid, axi->gid, axi->mode); |
073115d6 | 934 | break; } |
ac03221a | 935 | |
473ae30b AV |
936 | case AUDIT_EXECVE: { |
937 | struct audit_aux_data_execve *axi = (void *)aux; | |
938 | int i; | |
939 | const char *p; | |
940 | for (i = 0, p = axi->mem; i < axi->argc; i++) { | |
941 | audit_log_format(ab, "a%d=", i); | |
942 | p = audit_log_untrustedstring(ab, p); | |
943 | audit_log_format(ab, "\n"); | |
944 | } | |
945 | break; } | |
073115d6 | 946 | |
3ec3b2fb DW |
947 | case AUDIT_SOCKETCALL: { |
948 | int i; | |
949 | struct audit_aux_data_socketcall *axs = (void *)aux; | |
950 | audit_log_format(ab, "nargs=%d", axs->nargs); | |
951 | for (i=0; i<axs->nargs; i++) | |
952 | audit_log_format(ab, " a%d=%lx", i, axs->args[i]); | |
953 | break; } | |
954 | ||
955 | case AUDIT_SOCKADDR: { | |
956 | struct audit_aux_data_sockaddr *axs = (void *)aux; | |
957 | ||
958 | audit_log_format(ab, "saddr="); | |
959 | audit_log_hex(ab, axs->a, axs->len); | |
960 | break; } | |
01116105 SS |
961 | |
962 | case AUDIT_AVC_PATH: { | |
963 | struct audit_aux_data_path *axi = (void *)aux; | |
964 | audit_log_d_path(ab, "path=", axi->dentry, axi->mnt); | |
01116105 SS |
965 | break; } |
966 | ||
db349509 AV |
967 | case AUDIT_FD_PAIR: { |
968 | struct audit_aux_data_fd_pair *axs = (void *)aux; | |
969 | audit_log_format(ab, "fd0=%d fd1=%d", axs->fd[0], axs->fd[1]); | |
970 | break; } | |
971 | ||
1da177e4 LT |
972 | } |
973 | audit_log_end(ab); | |
1da177e4 LT |
974 | } |
975 | ||
8f37d47c | 976 | if (context->pwd && context->pwdmnt) { |
e495149b | 977 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD); |
8f37d47c DW |
978 | if (ab) { |
979 | audit_log_d_path(ab, "cwd=", context->pwd, context->pwdmnt); | |
980 | audit_log_end(ab); | |
981 | } | |
982 | } | |
1da177e4 | 983 | for (i = 0; i < context->name_count; i++) { |
9c937dcc | 984 | struct audit_names *n = &context->names[i]; |
73241ccc | 985 | |
e495149b | 986 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_PATH); |
1da177e4 LT |
987 | if (!ab) |
988 | continue; /* audit_panic has been called */ | |
8f37d47c | 989 | |
1da177e4 | 990 | audit_log_format(ab, "item=%d", i); |
73241ccc | 991 | |
9c937dcc AG |
992 | if (n->name) { |
993 | switch(n->name_len) { | |
994 | case AUDIT_NAME_FULL: | |
995 | /* log the full path */ | |
996 | audit_log_format(ab, " name="); | |
997 | audit_log_untrustedstring(ab, n->name); | |
998 | break; | |
999 | case 0: | |
1000 | /* name was specified as a relative path and the | |
1001 | * directory component is the cwd */ | |
1002 | audit_log_d_path(ab, " name=", context->pwd, | |
1003 | context->pwdmnt); | |
1004 | break; | |
1005 | default: | |
1006 | /* log the name's directory component */ | |
1007 | audit_log_format(ab, " name="); | |
1008 | audit_log_n_untrustedstring(ab, n->name_len, | |
1009 | n->name); | |
1010 | } | |
1011 | } else | |
1012 | audit_log_format(ab, " name=(null)"); | |
1013 | ||
1014 | if (n->ino != (unsigned long)-1) { | |
1015 | audit_log_format(ab, " inode=%lu" | |
1016 | " dev=%02x:%02x mode=%#o" | |
1017 | " ouid=%u ogid=%u rdev=%02x:%02x", | |
1018 | n->ino, | |
1019 | MAJOR(n->dev), | |
1020 | MINOR(n->dev), | |
1021 | n->mode, | |
1022 | n->uid, | |
1023 | n->gid, | |
1024 | MAJOR(n->rdev), | |
1025 | MINOR(n->rdev)); | |
1026 | } | |
1027 | if (n->osid != 0) { | |
1b50eed9 SG |
1028 | char *ctx = NULL; |
1029 | u32 len; | |
1a70cd40 | 1030 | if (selinux_sid_to_string( |
9c937dcc AG |
1031 | n->osid, &ctx, &len)) { |
1032 | audit_log_format(ab, " osid=%u", n->osid); | |
9c7aa6aa | 1033 | call_panic = 2; |
1b50eed9 SG |
1034 | } else |
1035 | audit_log_format(ab, " obj=%s", ctx); | |
1036 | kfree(ctx); | |
8c8570fb DK |
1037 | } |
1038 | ||
1da177e4 LT |
1039 | audit_log_end(ab); |
1040 | } | |
9c7aa6aa SG |
1041 | if (call_panic) |
1042 | audit_panic("error converting sid to string"); | |
1da177e4 LT |
1043 | } |
1044 | ||
b0dd25a8 RD |
1045 | /** |
1046 | * audit_free - free a per-task audit context | |
1047 | * @tsk: task whose audit context block to free | |
1048 | * | |
fa84cb93 | 1049 | * Called from copy_process and do_exit |
b0dd25a8 | 1050 | */ |
1da177e4 LT |
1051 | void audit_free(struct task_struct *tsk) |
1052 | { | |
1053 | struct audit_context *context; | |
1054 | ||
1da177e4 | 1055 | context = audit_get_context(tsk, 0, 0); |
1da177e4 LT |
1056 | if (likely(!context)) |
1057 | return; | |
1058 | ||
1059 | /* Check for system calls that do not go through the exit | |
f5561964 DW |
1060 | * function (e.g., exit_group), then free context block. |
1061 | * We use GFP_ATOMIC here because we might be doing this | |
1062 | * in the context of the idle thread */ | |
e495149b | 1063 | /* that can happen only if we are called from do_exit() */ |
f7056d64 | 1064 | if (context->in_syscall && context->auditable) |
e495149b | 1065 | audit_log_exit(context, tsk); |
1da177e4 LT |
1066 | |
1067 | audit_free_context(context); | |
1068 | } | |
1069 | ||
b0dd25a8 RD |
1070 | /** |
1071 | * audit_syscall_entry - fill in an audit record at syscall entry | |
1072 | * @tsk: task being audited | |
1073 | * @arch: architecture type | |
1074 | * @major: major syscall type (function) | |
1075 | * @a1: additional syscall register 1 | |
1076 | * @a2: additional syscall register 2 | |
1077 | * @a3: additional syscall register 3 | |
1078 | * @a4: additional syscall register 4 | |
1079 | * | |
1080 | * Fill in audit context at syscall entry. This only happens if the | |
1da177e4 LT |
1081 | * audit context was created when the task was created and the state or |
1082 | * filters demand the audit context be built. If the state from the | |
1083 | * per-task filter or from the per-syscall filter is AUDIT_RECORD_CONTEXT, | |
1084 | * then the record will be written at syscall exit time (otherwise, it | |
1085 | * will only be written if another part of the kernel requests that it | |
b0dd25a8 RD |
1086 | * be written). |
1087 | */ | |
5411be59 | 1088 | void audit_syscall_entry(int arch, int major, |
1da177e4 LT |
1089 | unsigned long a1, unsigned long a2, |
1090 | unsigned long a3, unsigned long a4) | |
1091 | { | |
5411be59 | 1092 | struct task_struct *tsk = current; |
1da177e4 LT |
1093 | struct audit_context *context = tsk->audit_context; |
1094 | enum audit_state state; | |
1095 | ||
1096 | BUG_ON(!context); | |
1097 | ||
b0dd25a8 RD |
1098 | /* |
1099 | * This happens only on certain architectures that make system | |
1da177e4 LT |
1100 | * calls in kernel_thread via the entry.S interface, instead of |
1101 | * with direct calls. (If you are porting to a new | |
1102 | * architecture, hitting this condition can indicate that you | |
1103 | * got the _exit/_leave calls backward in entry.S.) | |
1104 | * | |
1105 | * i386 no | |
1106 | * x86_64 no | |
2ef9481e | 1107 | * ppc64 yes (see arch/powerpc/platforms/iseries/misc.S) |
1da177e4 LT |
1108 | * |
1109 | * This also happens with vm86 emulation in a non-nested manner | |
1110 | * (entries without exits), so this case must be caught. | |
1111 | */ | |
1112 | if (context->in_syscall) { | |
1113 | struct audit_context *newctx; | |
1114 | ||
1da177e4 LT |
1115 | #if AUDIT_DEBUG |
1116 | printk(KERN_ERR | |
1117 | "audit(:%d) pid=%d in syscall=%d;" | |
1118 | " entering syscall=%d\n", | |
1119 | context->serial, tsk->pid, context->major, major); | |
1120 | #endif | |
1121 | newctx = audit_alloc_context(context->state); | |
1122 | if (newctx) { | |
1123 | newctx->previous = context; | |
1124 | context = newctx; | |
1125 | tsk->audit_context = newctx; | |
1126 | } else { | |
1127 | /* If we can't alloc a new context, the best we | |
1128 | * can do is to leak memory (any pending putname | |
1129 | * will be lost). The only other alternative is | |
1130 | * to abandon auditing. */ | |
1131 | audit_zero_context(context, context->state); | |
1132 | } | |
1133 | } | |
1134 | BUG_ON(context->in_syscall || context->name_count); | |
1135 | ||
1136 | if (!audit_enabled) | |
1137 | return; | |
1138 | ||
2fd6f58b | 1139 | context->arch = arch; |
1da177e4 LT |
1140 | context->major = major; |
1141 | context->argv[0] = a1; | |
1142 | context->argv[1] = a2; | |
1143 | context->argv[2] = a3; | |
1144 | context->argv[3] = a4; | |
1145 | ||
1146 | state = context->state; | |
d51374ad AV |
1147 | context->dummy = !audit_n_rules; |
1148 | if (!context->dummy && (state == AUDIT_SETUP_CONTEXT || state == AUDIT_BUILD_CONTEXT)) | |
0f45aa18 | 1149 | state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_ENTRY]); |
1da177e4 LT |
1150 | if (likely(state == AUDIT_DISABLED)) |
1151 | return; | |
1152 | ||
ce625a80 | 1153 | context->serial = 0; |
1da177e4 LT |
1154 | context->ctime = CURRENT_TIME; |
1155 | context->in_syscall = 1; | |
1156 | context->auditable = !!(state == AUDIT_RECORD_CONTEXT); | |
419c58f1 | 1157 | context->ppid = 0; |
1da177e4 LT |
1158 | } |
1159 | ||
b0dd25a8 RD |
1160 | /** |
1161 | * audit_syscall_exit - deallocate audit context after a system call | |
1162 | * @tsk: task being audited | |
1163 | * @valid: success/failure flag | |
1164 | * @return_code: syscall return value | |
1165 | * | |
1166 | * Tear down after system call. If the audit context has been marked as | |
1da177e4 LT |
1167 | * auditable (either because of the AUDIT_RECORD_CONTEXT state from |
1168 | * filtering, or because some other part of the kernel write an audit | |
1169 | * message), then write out the syscall information. In call cases, | |
b0dd25a8 RD |
1170 | * free the names stored from getname(). |
1171 | */ | |
5411be59 | 1172 | void audit_syscall_exit(int valid, long return_code) |
1da177e4 | 1173 | { |
5411be59 | 1174 | struct task_struct *tsk = current; |
1da177e4 LT |
1175 | struct audit_context *context; |
1176 | ||
2fd6f58b | 1177 | context = audit_get_context(tsk, valid, return_code); |
1da177e4 | 1178 | |
1da177e4 | 1179 | if (likely(!context)) |
97e94c45 | 1180 | return; |
1da177e4 | 1181 | |
f7056d64 | 1182 | if (context->in_syscall && context->auditable) |
e495149b | 1183 | audit_log_exit(context, tsk); |
1da177e4 LT |
1184 | |
1185 | context->in_syscall = 0; | |
1186 | context->auditable = 0; | |
2fd6f58b | 1187 | |
1da177e4 LT |
1188 | if (context->previous) { |
1189 | struct audit_context *new_context = context->previous; | |
1190 | context->previous = NULL; | |
1191 | audit_free_context(context); | |
1192 | tsk->audit_context = new_context; | |
1193 | } else { | |
1194 | audit_free_names(context); | |
1195 | audit_free_aux(context); | |
5adc8a6a AG |
1196 | kfree(context->filterkey); |
1197 | context->filterkey = NULL; | |
1da177e4 LT |
1198 | tsk->audit_context = context; |
1199 | } | |
1da177e4 LT |
1200 | } |
1201 | ||
b0dd25a8 RD |
1202 | /** |
1203 | * audit_getname - add a name to the list | |
1204 | * @name: name to add | |
1205 | * | |
1206 | * Add a name to the list of audit names for this context. | |
1207 | * Called from fs/namei.c:getname(). | |
1208 | */ | |
d8945bb5 | 1209 | void __audit_getname(const char *name) |
1da177e4 LT |
1210 | { |
1211 | struct audit_context *context = current->audit_context; | |
1212 | ||
d8945bb5 | 1213 | if (IS_ERR(name) || !name) |
1da177e4 LT |
1214 | return; |
1215 | ||
1216 | if (!context->in_syscall) { | |
1217 | #if AUDIT_DEBUG == 2 | |
1218 | printk(KERN_ERR "%s:%d(:%d): ignoring getname(%p)\n", | |
1219 | __FILE__, __LINE__, context->serial, name); | |
1220 | dump_stack(); | |
1221 | #endif | |
1222 | return; | |
1223 | } | |
1224 | BUG_ON(context->name_count >= AUDIT_NAMES); | |
1225 | context->names[context->name_count].name = name; | |
9c937dcc AG |
1226 | context->names[context->name_count].name_len = AUDIT_NAME_FULL; |
1227 | context->names[context->name_count].name_put = 1; | |
1da177e4 LT |
1228 | context->names[context->name_count].ino = (unsigned long)-1; |
1229 | ++context->name_count; | |
8f37d47c DW |
1230 | if (!context->pwd) { |
1231 | read_lock(¤t->fs->lock); | |
1232 | context->pwd = dget(current->fs->pwd); | |
1233 | context->pwdmnt = mntget(current->fs->pwdmnt); | |
1234 | read_unlock(¤t->fs->lock); | |
1235 | } | |
1236 | ||
1da177e4 LT |
1237 | } |
1238 | ||
b0dd25a8 RD |
1239 | /* audit_putname - intercept a putname request |
1240 | * @name: name to intercept and delay for putname | |
1241 | * | |
1242 | * If we have stored the name from getname in the audit context, | |
1243 | * then we delay the putname until syscall exit. | |
1244 | * Called from include/linux/fs.h:putname(). | |
1245 | */ | |
1da177e4 LT |
1246 | void audit_putname(const char *name) |
1247 | { | |
1248 | struct audit_context *context = current->audit_context; | |
1249 | ||
1250 | BUG_ON(!context); | |
1251 | if (!context->in_syscall) { | |
1252 | #if AUDIT_DEBUG == 2 | |
1253 | printk(KERN_ERR "%s:%d(:%d): __putname(%p)\n", | |
1254 | __FILE__, __LINE__, context->serial, name); | |
1255 | if (context->name_count) { | |
1256 | int i; | |
1257 | for (i = 0; i < context->name_count; i++) | |
1258 | printk(KERN_ERR "name[%d] = %p = %s\n", i, | |
1259 | context->names[i].name, | |
73241ccc | 1260 | context->names[i].name ?: "(null)"); |
1da177e4 LT |
1261 | } |
1262 | #endif | |
1263 | __putname(name); | |
1264 | } | |
1265 | #if AUDIT_DEBUG | |
1266 | else { | |
1267 | ++context->put_count; | |
1268 | if (context->put_count > context->name_count) { | |
1269 | printk(KERN_ERR "%s:%d(:%d): major=%d" | |
1270 | " in_syscall=%d putname(%p) name_count=%d" | |
1271 | " put_count=%d\n", | |
1272 | __FILE__, __LINE__, | |
1273 | context->serial, context->major, | |
1274 | context->in_syscall, name, context->name_count, | |
1275 | context->put_count); | |
1276 | dump_stack(); | |
1277 | } | |
1278 | } | |
1279 | #endif | |
1280 | } | |
1281 | ||
3e2efce0 AG |
1282 | /* Copy inode data into an audit_names. */ |
1283 | static void audit_copy_inode(struct audit_names *name, const struct inode *inode) | |
8c8570fb | 1284 | { |
3e2efce0 AG |
1285 | name->ino = inode->i_ino; |
1286 | name->dev = inode->i_sb->s_dev; | |
1287 | name->mode = inode->i_mode; | |
1288 | name->uid = inode->i_uid; | |
1289 | name->gid = inode->i_gid; | |
1290 | name->rdev = inode->i_rdev; | |
1291 | selinux_get_inode_sid(inode, &name->osid); | |
8c8570fb DK |
1292 | } |
1293 | ||
b0dd25a8 RD |
1294 | /** |
1295 | * audit_inode - store the inode and device from a lookup | |
1296 | * @name: name being audited | |
1297 | * @inode: inode being audited | |
b0dd25a8 RD |
1298 | * |
1299 | * Called from fs/namei.c:path_lookup(). | |
1300 | */ | |
9c937dcc | 1301 | void __audit_inode(const char *name, const struct inode *inode) |
1da177e4 LT |
1302 | { |
1303 | int idx; | |
1304 | struct audit_context *context = current->audit_context; | |
1305 | ||
1306 | if (!context->in_syscall) | |
1307 | return; | |
1308 | if (context->name_count | |
1309 | && context->names[context->name_count-1].name | |
1310 | && context->names[context->name_count-1].name == name) | |
1311 | idx = context->name_count - 1; | |
1312 | else if (context->name_count > 1 | |
1313 | && context->names[context->name_count-2].name | |
1314 | && context->names[context->name_count-2].name == name) | |
1315 | idx = context->name_count - 2; | |
1316 | else { | |
1317 | /* FIXME: how much do we care about inodes that have no | |
1318 | * associated name? */ | |
1319 | if (context->name_count >= AUDIT_NAMES - AUDIT_NAMES_RESERVED) | |
1320 | return; | |
1321 | idx = context->name_count++; | |
1322 | context->names[idx].name = NULL; | |
1323 | #if AUDIT_DEBUG | |
1324 | ++context->ino_count; | |
1325 | #endif | |
1326 | } | |
3e2efce0 | 1327 | audit_copy_inode(&context->names[idx], inode); |
73241ccc AG |
1328 | } |
1329 | ||
1330 | /** | |
1331 | * audit_inode_child - collect inode info for created/removed objects | |
1332 | * @dname: inode's dentry name | |
1333 | * @inode: inode being audited | |
73d3ec5a | 1334 | * @parent: inode of dentry parent |
73241ccc AG |
1335 | * |
1336 | * For syscalls that create or remove filesystem objects, audit_inode | |
1337 | * can only collect information for the filesystem object's parent. | |
1338 | * This call updates the audit context with the child's information. | |
1339 | * Syscalls that create a new filesystem object must be hooked after | |
1340 | * the object is created. Syscalls that remove a filesystem object | |
1341 | * must be hooked prior, in order to capture the target inode during | |
1342 | * unsuccessful attempts. | |
1343 | */ | |
1344 | void __audit_inode_child(const char *dname, const struct inode *inode, | |
73d3ec5a | 1345 | const struct inode *parent) |
73241ccc AG |
1346 | { |
1347 | int idx; | |
1348 | struct audit_context *context = current->audit_context; | |
9c937dcc AG |
1349 | const char *found_name = NULL; |
1350 | int dirlen = 0; | |
73241ccc AG |
1351 | |
1352 | if (!context->in_syscall) | |
1353 | return; | |
1354 | ||
1355 | /* determine matching parent */ | |
f368c07d | 1356 | if (!dname) |
9c937dcc | 1357 | goto update_context; |
f368c07d | 1358 | for (idx = 0; idx < context->name_count; idx++) |
73d3ec5a | 1359 | if (context->names[idx].ino == parent->i_ino) { |
f368c07d | 1360 | const char *name = context->names[idx].name; |
73241ccc | 1361 | |
f368c07d AG |
1362 | if (!name) |
1363 | continue; | |
1364 | ||
9c937dcc AG |
1365 | if (audit_compare_dname_path(dname, name, &dirlen) == 0) { |
1366 | context->names[idx].name_len = dirlen; | |
1367 | found_name = name; | |
1368 | break; | |
1369 | } | |
f368c07d | 1370 | } |
73241ccc | 1371 | |
9c937dcc | 1372 | update_context: |
ac9910ce SG |
1373 | idx = context->name_count; |
1374 | if (context->name_count == AUDIT_NAMES) { | |
1375 | printk(KERN_DEBUG "name_count maxed and losing %s\n", | |
1376 | found_name ?: "(null)"); | |
1377 | return; | |
1378 | } | |
1379 | context->name_count++; | |
73241ccc AG |
1380 | #if AUDIT_DEBUG |
1381 | context->ino_count++; | |
1382 | #endif | |
9c937dcc AG |
1383 | /* Re-use the name belonging to the slot for a matching parent directory. |
1384 | * All names for this context are relinquished in audit_free_names() */ | |
1385 | context->names[idx].name = found_name; | |
1386 | context->names[idx].name_len = AUDIT_NAME_FULL; | |
1387 | context->names[idx].name_put = 0; /* don't call __putname() */ | |
73241ccc | 1388 | |
3e2efce0 AG |
1389 | if (!inode) |
1390 | context->names[idx].ino = (unsigned long)-1; | |
1391 | else | |
1392 | audit_copy_inode(&context->names[idx], inode); | |
73d3ec5a AG |
1393 | |
1394 | /* A parent was not found in audit_names, so copy the inode data for the | |
1395 | * provided parent. */ | |
1396 | if (!found_name) { | |
ac9910ce SG |
1397 | idx = context->name_count; |
1398 | if (context->name_count == AUDIT_NAMES) { | |
1399 | printk(KERN_DEBUG | |
1400 | "name_count maxed and losing parent inode data: dev=%02x:%02x, inode=%lu", | |
1401 | MAJOR(parent->i_sb->s_dev), | |
1402 | MINOR(parent->i_sb->s_dev), | |
1403 | parent->i_ino); | |
1404 | return; | |
1405 | } | |
1406 | context->name_count++; | |
73d3ec5a AG |
1407 | #if AUDIT_DEBUG |
1408 | context->ino_count++; | |
1409 | #endif | |
1410 | audit_copy_inode(&context->names[idx], parent); | |
1411 | } | |
3e2efce0 AG |
1412 | } |
1413 | ||
1414 | /** | |
1415 | * audit_inode_update - update inode info for last collected name | |
1416 | * @inode: inode being audited | |
1417 | * | |
1418 | * When open() is called on an existing object with the O_CREAT flag, the inode | |
1419 | * data audit initially collects is incorrect. This additional hook ensures | |
1420 | * audit has the inode data for the actual object to be opened. | |
1421 | */ | |
1422 | void __audit_inode_update(const struct inode *inode) | |
1423 | { | |
1424 | struct audit_context *context = current->audit_context; | |
1425 | int idx; | |
1426 | ||
1427 | if (!context->in_syscall || !inode) | |
1428 | return; | |
1429 | ||
1430 | if (context->name_count == 0) { | |
1431 | context->name_count++; | |
1432 | #if AUDIT_DEBUG | |
1433 | context->ino_count++; | |
1434 | #endif | |
1435 | } | |
1436 | idx = context->name_count - 1; | |
1437 | ||
1438 | audit_copy_inode(&context->names[idx], inode); | |
1da177e4 LT |
1439 | } |
1440 | ||
b0dd25a8 RD |
1441 | /** |
1442 | * auditsc_get_stamp - get local copies of audit_context values | |
1443 | * @ctx: audit_context for the task | |
1444 | * @t: timespec to store time recorded in the audit_context | |
1445 | * @serial: serial value that is recorded in the audit_context | |
1446 | * | |
1447 | * Also sets the context as auditable. | |
1448 | */ | |
bfb4496e DW |
1449 | void auditsc_get_stamp(struct audit_context *ctx, |
1450 | struct timespec *t, unsigned int *serial) | |
1da177e4 | 1451 | { |
ce625a80 DW |
1452 | if (!ctx->serial) |
1453 | ctx->serial = audit_serial(); | |
bfb4496e DW |
1454 | t->tv_sec = ctx->ctime.tv_sec; |
1455 | t->tv_nsec = ctx->ctime.tv_nsec; | |
1456 | *serial = ctx->serial; | |
1457 | ctx->auditable = 1; | |
1da177e4 LT |
1458 | } |
1459 | ||
b0dd25a8 RD |
1460 | /** |
1461 | * audit_set_loginuid - set a task's audit_context loginuid | |
1462 | * @task: task whose audit context is being modified | |
1463 | * @loginuid: loginuid value | |
1464 | * | |
1465 | * Returns 0. | |
1466 | * | |
1467 | * Called (set) from fs/proc/base.c::proc_loginuid_write(). | |
1468 | */ | |
456be6cd | 1469 | int audit_set_loginuid(struct task_struct *task, uid_t loginuid) |
1da177e4 | 1470 | { |
41757106 SG |
1471 | struct audit_context *context = task->audit_context; |
1472 | ||
1473 | if (context) { | |
1474 | /* Only log if audit is enabled */ | |
1475 | if (context->in_syscall) { | |
1476 | struct audit_buffer *ab; | |
1477 | ||
1478 | ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_LOGIN); | |
1479 | if (ab) { | |
1480 | audit_log_format(ab, "login pid=%d uid=%u " | |
1481 | "old auid=%u new auid=%u", | |
1482 | task->pid, task->uid, | |
1483 | context->loginuid, loginuid); | |
1484 | audit_log_end(ab); | |
1485 | } | |
c0404993 | 1486 | } |
41757106 | 1487 | context->loginuid = loginuid; |
1da177e4 LT |
1488 | } |
1489 | return 0; | |
1490 | } | |
1491 | ||
b0dd25a8 RD |
1492 | /** |
1493 | * audit_get_loginuid - get the loginuid for an audit_context | |
1494 | * @ctx: the audit_context | |
1495 | * | |
1496 | * Returns the context's loginuid or -1 if @ctx is NULL. | |
1497 | */ | |
1da177e4 LT |
1498 | uid_t audit_get_loginuid(struct audit_context *ctx) |
1499 | { | |
1500 | return ctx ? ctx->loginuid : -1; | |
1501 | } | |
1502 | ||
161a09e7 JL |
1503 | EXPORT_SYMBOL(audit_get_loginuid); |
1504 | ||
20ca73bc GW |
1505 | /** |
1506 | * __audit_mq_open - record audit data for a POSIX MQ open | |
1507 | * @oflag: open flag | |
1508 | * @mode: mode bits | |
1509 | * @u_attr: queue attributes | |
1510 | * | |
1511 | * Returns 0 for success or NULL context or < 0 on error. | |
1512 | */ | |
1513 | int __audit_mq_open(int oflag, mode_t mode, struct mq_attr __user *u_attr) | |
1514 | { | |
1515 | struct audit_aux_data_mq_open *ax; | |
1516 | struct audit_context *context = current->audit_context; | |
1517 | ||
1518 | if (!audit_enabled) | |
1519 | return 0; | |
1520 | ||
1521 | if (likely(!context)) | |
1522 | return 0; | |
1523 | ||
1524 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1525 | if (!ax) | |
1526 | return -ENOMEM; | |
1527 | ||
1528 | if (u_attr != NULL) { | |
1529 | if (copy_from_user(&ax->attr, u_attr, sizeof(ax->attr))) { | |
1530 | kfree(ax); | |
1531 | return -EFAULT; | |
1532 | } | |
1533 | } else | |
1534 | memset(&ax->attr, 0, sizeof(ax->attr)); | |
1535 | ||
1536 | ax->oflag = oflag; | |
1537 | ax->mode = mode; | |
1538 | ||
1539 | ax->d.type = AUDIT_MQ_OPEN; | |
1540 | ax->d.next = context->aux; | |
1541 | context->aux = (void *)ax; | |
1542 | return 0; | |
1543 | } | |
1544 | ||
1545 | /** | |
1546 | * __audit_mq_timedsend - record audit data for a POSIX MQ timed send | |
1547 | * @mqdes: MQ descriptor | |
1548 | * @msg_len: Message length | |
1549 | * @msg_prio: Message priority | |
1dbe83c3 | 1550 | * @u_abs_timeout: Message timeout in absolute time |
20ca73bc GW |
1551 | * |
1552 | * Returns 0 for success or NULL context or < 0 on error. | |
1553 | */ | |
1554 | int __audit_mq_timedsend(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, | |
1555 | const struct timespec __user *u_abs_timeout) | |
1556 | { | |
1557 | struct audit_aux_data_mq_sendrecv *ax; | |
1558 | struct audit_context *context = current->audit_context; | |
1559 | ||
1560 | if (!audit_enabled) | |
1561 | return 0; | |
1562 | ||
1563 | if (likely(!context)) | |
1564 | return 0; | |
1565 | ||
1566 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1567 | if (!ax) | |
1568 | return -ENOMEM; | |
1569 | ||
1570 | if (u_abs_timeout != NULL) { | |
1571 | if (copy_from_user(&ax->abs_timeout, u_abs_timeout, sizeof(ax->abs_timeout))) { | |
1572 | kfree(ax); | |
1573 | return -EFAULT; | |
1574 | } | |
1575 | } else | |
1576 | memset(&ax->abs_timeout, 0, sizeof(ax->abs_timeout)); | |
1577 | ||
1578 | ax->mqdes = mqdes; | |
1579 | ax->msg_len = msg_len; | |
1580 | ax->msg_prio = msg_prio; | |
1581 | ||
1582 | ax->d.type = AUDIT_MQ_SENDRECV; | |
1583 | ax->d.next = context->aux; | |
1584 | context->aux = (void *)ax; | |
1585 | return 0; | |
1586 | } | |
1587 | ||
1588 | /** | |
1589 | * __audit_mq_timedreceive - record audit data for a POSIX MQ timed receive | |
1590 | * @mqdes: MQ descriptor | |
1591 | * @msg_len: Message length | |
1dbe83c3 RD |
1592 | * @u_msg_prio: Message priority |
1593 | * @u_abs_timeout: Message timeout in absolute time | |
20ca73bc GW |
1594 | * |
1595 | * Returns 0 for success or NULL context or < 0 on error. | |
1596 | */ | |
1597 | int __audit_mq_timedreceive(mqd_t mqdes, size_t msg_len, | |
1598 | unsigned int __user *u_msg_prio, | |
1599 | const struct timespec __user *u_abs_timeout) | |
1600 | { | |
1601 | struct audit_aux_data_mq_sendrecv *ax; | |
1602 | struct audit_context *context = current->audit_context; | |
1603 | ||
1604 | if (!audit_enabled) | |
1605 | return 0; | |
1606 | ||
1607 | if (likely(!context)) | |
1608 | return 0; | |
1609 | ||
1610 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1611 | if (!ax) | |
1612 | return -ENOMEM; | |
1613 | ||
1614 | if (u_msg_prio != NULL) { | |
1615 | if (get_user(ax->msg_prio, u_msg_prio)) { | |
1616 | kfree(ax); | |
1617 | return -EFAULT; | |
1618 | } | |
1619 | } else | |
1620 | ax->msg_prio = 0; | |
1621 | ||
1622 | if (u_abs_timeout != NULL) { | |
1623 | if (copy_from_user(&ax->abs_timeout, u_abs_timeout, sizeof(ax->abs_timeout))) { | |
1624 | kfree(ax); | |
1625 | return -EFAULT; | |
1626 | } | |
1627 | } else | |
1628 | memset(&ax->abs_timeout, 0, sizeof(ax->abs_timeout)); | |
1629 | ||
1630 | ax->mqdes = mqdes; | |
1631 | ax->msg_len = msg_len; | |
1632 | ||
1633 | ax->d.type = AUDIT_MQ_SENDRECV; | |
1634 | ax->d.next = context->aux; | |
1635 | context->aux = (void *)ax; | |
1636 | return 0; | |
1637 | } | |
1638 | ||
1639 | /** | |
1640 | * __audit_mq_notify - record audit data for a POSIX MQ notify | |
1641 | * @mqdes: MQ descriptor | |
1642 | * @u_notification: Notification event | |
1643 | * | |
1644 | * Returns 0 for success or NULL context or < 0 on error. | |
1645 | */ | |
1646 | ||
1647 | int __audit_mq_notify(mqd_t mqdes, const struct sigevent __user *u_notification) | |
1648 | { | |
1649 | struct audit_aux_data_mq_notify *ax; | |
1650 | struct audit_context *context = current->audit_context; | |
1651 | ||
1652 | if (!audit_enabled) | |
1653 | return 0; | |
1654 | ||
1655 | if (likely(!context)) | |
1656 | return 0; | |
1657 | ||
1658 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1659 | if (!ax) | |
1660 | return -ENOMEM; | |
1661 | ||
1662 | if (u_notification != NULL) { | |
1663 | if (copy_from_user(&ax->notification, u_notification, sizeof(ax->notification))) { | |
1664 | kfree(ax); | |
1665 | return -EFAULT; | |
1666 | } | |
1667 | } else | |
1668 | memset(&ax->notification, 0, sizeof(ax->notification)); | |
1669 | ||
1670 | ax->mqdes = mqdes; | |
1671 | ||
1672 | ax->d.type = AUDIT_MQ_NOTIFY; | |
1673 | ax->d.next = context->aux; | |
1674 | context->aux = (void *)ax; | |
1675 | return 0; | |
1676 | } | |
1677 | ||
1678 | /** | |
1679 | * __audit_mq_getsetattr - record audit data for a POSIX MQ get/set attribute | |
1680 | * @mqdes: MQ descriptor | |
1681 | * @mqstat: MQ flags | |
1682 | * | |
1683 | * Returns 0 for success or NULL context or < 0 on error. | |
1684 | */ | |
1685 | int __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat) | |
1686 | { | |
1687 | struct audit_aux_data_mq_getsetattr *ax; | |
1688 | struct audit_context *context = current->audit_context; | |
1689 | ||
1690 | if (!audit_enabled) | |
1691 | return 0; | |
1692 | ||
1693 | if (likely(!context)) | |
1694 | return 0; | |
1695 | ||
1696 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1697 | if (!ax) | |
1698 | return -ENOMEM; | |
1699 | ||
1700 | ax->mqdes = mqdes; | |
1701 | ax->mqstat = *mqstat; | |
1702 | ||
1703 | ax->d.type = AUDIT_MQ_GETSETATTR; | |
1704 | ax->d.next = context->aux; | |
1705 | context->aux = (void *)ax; | |
1706 | return 0; | |
1707 | } | |
1708 | ||
b0dd25a8 | 1709 | /** |
073115d6 SG |
1710 | * audit_ipc_obj - record audit data for ipc object |
1711 | * @ipcp: ipc permissions | |
1712 | * | |
1713 | * Returns 0 for success or NULL context or < 0 on error. | |
1714 | */ | |
d8945bb5 | 1715 | int __audit_ipc_obj(struct kern_ipc_perm *ipcp) |
073115d6 SG |
1716 | { |
1717 | struct audit_aux_data_ipcctl *ax; | |
1718 | struct audit_context *context = current->audit_context; | |
1719 | ||
073115d6 SG |
1720 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); |
1721 | if (!ax) | |
1722 | return -ENOMEM; | |
1723 | ||
1724 | ax->uid = ipcp->uid; | |
1725 | ax->gid = ipcp->gid; | |
1726 | ax->mode = ipcp->mode; | |
1727 | selinux_get_ipc_sid(ipcp, &ax->osid); | |
1728 | ||
1729 | ax->d.type = AUDIT_IPC; | |
1730 | ax->d.next = context->aux; | |
1731 | context->aux = (void *)ax; | |
1732 | return 0; | |
1733 | } | |
1734 | ||
1735 | /** | |
1736 | * audit_ipc_set_perm - record audit data for new ipc permissions | |
b0dd25a8 RD |
1737 | * @qbytes: msgq bytes |
1738 | * @uid: msgq user id | |
1739 | * @gid: msgq group id | |
1740 | * @mode: msgq mode (permissions) | |
1741 | * | |
1742 | * Returns 0 for success or NULL context or < 0 on error. | |
1743 | */ | |
d8945bb5 | 1744 | int __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode) |
1da177e4 LT |
1745 | { |
1746 | struct audit_aux_data_ipcctl *ax; | |
1747 | struct audit_context *context = current->audit_context; | |
1748 | ||
8c8570fb | 1749 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); |
1da177e4 LT |
1750 | if (!ax) |
1751 | return -ENOMEM; | |
1752 | ||
1753 | ax->qbytes = qbytes; | |
1754 | ax->uid = uid; | |
1755 | ax->gid = gid; | |
1756 | ax->mode = mode; | |
1757 | ||
073115d6 | 1758 | ax->d.type = AUDIT_IPC_SET_PERM; |
1da177e4 LT |
1759 | ax->d.next = context->aux; |
1760 | context->aux = (void *)ax; | |
1761 | return 0; | |
1762 | } | |
c2f0c7c3 | 1763 | |
473ae30b AV |
1764 | int audit_bprm(struct linux_binprm *bprm) |
1765 | { | |
1766 | struct audit_aux_data_execve *ax; | |
1767 | struct audit_context *context = current->audit_context; | |
1768 | unsigned long p, next; | |
1769 | void *to; | |
1770 | ||
5ac3a9c2 | 1771 | if (likely(!audit_enabled || !context || context->dummy)) |
473ae30b AV |
1772 | return 0; |
1773 | ||
1774 | ax = kmalloc(sizeof(*ax) + PAGE_SIZE * MAX_ARG_PAGES - bprm->p, | |
1775 | GFP_KERNEL); | |
1776 | if (!ax) | |
1777 | return -ENOMEM; | |
1778 | ||
1779 | ax->argc = bprm->argc; | |
1780 | ax->envc = bprm->envc; | |
1781 | for (p = bprm->p, to = ax->mem; p < MAX_ARG_PAGES*PAGE_SIZE; p = next) { | |
1782 | struct page *page = bprm->page[p / PAGE_SIZE]; | |
1783 | void *kaddr = kmap(page); | |
1784 | next = (p + PAGE_SIZE) & ~(PAGE_SIZE - 1); | |
1785 | memcpy(to, kaddr + (p & (PAGE_SIZE - 1)), next - p); | |
1786 | to += next - p; | |
1787 | kunmap(page); | |
1788 | } | |
1789 | ||
1790 | ax->d.type = AUDIT_EXECVE; | |
1791 | ax->d.next = context->aux; | |
1792 | context->aux = (void *)ax; | |
1793 | return 0; | |
1794 | } | |
1795 | ||
1796 | ||
b0dd25a8 RD |
1797 | /** |
1798 | * audit_socketcall - record audit data for sys_socketcall | |
1799 | * @nargs: number of args | |
1800 | * @args: args array | |
1801 | * | |
1802 | * Returns 0 for success or NULL context or < 0 on error. | |
1803 | */ | |
3ec3b2fb DW |
1804 | int audit_socketcall(int nargs, unsigned long *args) |
1805 | { | |
1806 | struct audit_aux_data_socketcall *ax; | |
1807 | struct audit_context *context = current->audit_context; | |
1808 | ||
5ac3a9c2 | 1809 | if (likely(!context || context->dummy)) |
3ec3b2fb DW |
1810 | return 0; |
1811 | ||
1812 | ax = kmalloc(sizeof(*ax) + nargs * sizeof(unsigned long), GFP_KERNEL); | |
1813 | if (!ax) | |
1814 | return -ENOMEM; | |
1815 | ||
1816 | ax->nargs = nargs; | |
1817 | memcpy(ax->args, args, nargs * sizeof(unsigned long)); | |
1818 | ||
1819 | ax->d.type = AUDIT_SOCKETCALL; | |
1820 | ax->d.next = context->aux; | |
1821 | context->aux = (void *)ax; | |
1822 | return 0; | |
1823 | } | |
1824 | ||
db349509 AV |
1825 | /** |
1826 | * __audit_fd_pair - record audit data for pipe and socketpair | |
1827 | * @fd1: the first file descriptor | |
1828 | * @fd2: the second file descriptor | |
1829 | * | |
1830 | * Returns 0 for success or NULL context or < 0 on error. | |
1831 | */ | |
1832 | int __audit_fd_pair(int fd1, int fd2) | |
1833 | { | |
1834 | struct audit_context *context = current->audit_context; | |
1835 | struct audit_aux_data_fd_pair *ax; | |
1836 | ||
1837 | if (likely(!context)) { | |
1838 | return 0; | |
1839 | } | |
1840 | ||
1841 | ax = kmalloc(sizeof(*ax), GFP_KERNEL); | |
1842 | if (!ax) { | |
1843 | return -ENOMEM; | |
1844 | } | |
1845 | ||
1846 | ax->fd[0] = fd1; | |
1847 | ax->fd[1] = fd2; | |
1848 | ||
1849 | ax->d.type = AUDIT_FD_PAIR; | |
1850 | ax->d.next = context->aux; | |
1851 | context->aux = (void *)ax; | |
1852 | return 0; | |
1853 | } | |
1854 | ||
b0dd25a8 RD |
1855 | /** |
1856 | * audit_sockaddr - record audit data for sys_bind, sys_connect, sys_sendto | |
1857 | * @len: data length in user space | |
1858 | * @a: data address in kernel space | |
1859 | * | |
1860 | * Returns 0 for success or NULL context or < 0 on error. | |
1861 | */ | |
3ec3b2fb DW |
1862 | int audit_sockaddr(int len, void *a) |
1863 | { | |
1864 | struct audit_aux_data_sockaddr *ax; | |
1865 | struct audit_context *context = current->audit_context; | |
1866 | ||
5ac3a9c2 | 1867 | if (likely(!context || context->dummy)) |
3ec3b2fb DW |
1868 | return 0; |
1869 | ||
1870 | ax = kmalloc(sizeof(*ax) + len, GFP_KERNEL); | |
1871 | if (!ax) | |
1872 | return -ENOMEM; | |
1873 | ||
1874 | ax->len = len; | |
1875 | memcpy(ax->a, a, len); | |
1876 | ||
1877 | ax->d.type = AUDIT_SOCKADDR; | |
1878 | ax->d.next = context->aux; | |
1879 | context->aux = (void *)ax; | |
1880 | return 0; | |
1881 | } | |
1882 | ||
b0dd25a8 RD |
1883 | /** |
1884 | * audit_avc_path - record the granting or denial of permissions | |
1885 | * @dentry: dentry to record | |
1886 | * @mnt: mnt to record | |
1887 | * | |
1888 | * Returns 0 for success or NULL context or < 0 on error. | |
1889 | * | |
1890 | * Called from security/selinux/avc.c::avc_audit() | |
1891 | */ | |
01116105 SS |
1892 | int audit_avc_path(struct dentry *dentry, struct vfsmount *mnt) |
1893 | { | |
1894 | struct audit_aux_data_path *ax; | |
1895 | struct audit_context *context = current->audit_context; | |
1896 | ||
1897 | if (likely(!context)) | |
1898 | return 0; | |
1899 | ||
1900 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1901 | if (!ax) | |
1902 | return -ENOMEM; | |
1903 | ||
1904 | ax->dentry = dget(dentry); | |
1905 | ax->mnt = mntget(mnt); | |
1906 | ||
1907 | ax->d.type = AUDIT_AVC_PATH; | |
1908 | ax->d.next = context->aux; | |
1909 | context->aux = (void *)ax; | |
1910 | return 0; | |
1911 | } | |
1912 | ||
b0dd25a8 RD |
1913 | /** |
1914 | * audit_signal_info - record signal info for shutting down audit subsystem | |
1915 | * @sig: signal value | |
1916 | * @t: task being signaled | |
1917 | * | |
1918 | * If the audit subsystem is being terminated, record the task (pid) | |
1919 | * and uid that is doing that. | |
1920 | */ | |
e1396065 | 1921 | void __audit_signal_info(int sig, struct task_struct *t) |
c2f0c7c3 SG |
1922 | { |
1923 | extern pid_t audit_sig_pid; | |
1924 | extern uid_t audit_sig_uid; | |
e1396065 AV |
1925 | extern u32 audit_sig_sid; |
1926 | ||
1927 | if (sig == SIGTERM || sig == SIGHUP || sig == SIGUSR1) { | |
1928 | struct task_struct *tsk = current; | |
1929 | struct audit_context *ctx = tsk->audit_context; | |
1930 | audit_sig_pid = tsk->pid; | |
1931 | if (ctx) | |
1932 | audit_sig_uid = ctx->loginuid; | |
1933 | else | |
1934 | audit_sig_uid = tsk->uid; | |
1935 | selinux_get_task_sid(tsk, &audit_sig_sid); | |
c2f0c7c3 SG |
1936 | } |
1937 | } |