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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 | 73 | |
1da177e4 LT |
74 | /* AUDIT_NAMES is the number of slots we reserve in the audit_context |
75 | * for saving names from getname(). */ | |
76 | #define AUDIT_NAMES 20 | |
77 | ||
9c937dcc AG |
78 | /* Indicates that audit should log the full pathname. */ |
79 | #define AUDIT_NAME_FULL -1 | |
80 | ||
471a5c7c AV |
81 | /* number of audit rules */ |
82 | int audit_n_rules; | |
83 | ||
e54dc243 AG |
84 | /* determines whether we collect data for signals sent */ |
85 | int audit_signals; | |
86 | ||
1da177e4 LT |
87 | /* When fs/namei.c:getname() is called, we store the pointer in name and |
88 | * we don't let putname() free it (instead we free all of the saved | |
89 | * pointers at syscall exit time). | |
90 | * | |
91 | * Further, in fs/namei.c:path_lookup() we store the inode and device. */ | |
92 | struct audit_names { | |
93 | const char *name; | |
9c937dcc AG |
94 | int name_len; /* number of name's characters to log */ |
95 | unsigned name_put; /* call __putname() for this name */ | |
1da177e4 LT |
96 | unsigned long ino; |
97 | dev_t dev; | |
98 | umode_t mode; | |
99 | uid_t uid; | |
100 | gid_t gid; | |
101 | dev_t rdev; | |
1b50eed9 | 102 | u32 osid; |
1da177e4 LT |
103 | }; |
104 | ||
105 | struct audit_aux_data { | |
106 | struct audit_aux_data *next; | |
107 | int type; | |
108 | }; | |
109 | ||
110 | #define AUDIT_AUX_IPCPERM 0 | |
111 | ||
e54dc243 AG |
112 | /* Number of target pids per aux struct. */ |
113 | #define AUDIT_AUX_PIDS 16 | |
114 | ||
20ca73bc GW |
115 | struct audit_aux_data_mq_open { |
116 | struct audit_aux_data d; | |
117 | int oflag; | |
118 | mode_t mode; | |
119 | struct mq_attr attr; | |
120 | }; | |
121 | ||
122 | struct audit_aux_data_mq_sendrecv { | |
123 | struct audit_aux_data d; | |
124 | mqd_t mqdes; | |
125 | size_t msg_len; | |
126 | unsigned int msg_prio; | |
127 | struct timespec abs_timeout; | |
128 | }; | |
129 | ||
130 | struct audit_aux_data_mq_notify { | |
131 | struct audit_aux_data d; | |
132 | mqd_t mqdes; | |
133 | struct sigevent notification; | |
134 | }; | |
135 | ||
136 | struct audit_aux_data_mq_getsetattr { | |
137 | struct audit_aux_data d; | |
138 | mqd_t mqdes; | |
139 | struct mq_attr mqstat; | |
140 | }; | |
141 | ||
1da177e4 LT |
142 | struct audit_aux_data_ipcctl { |
143 | struct audit_aux_data d; | |
144 | struct ipc_perm p; | |
145 | unsigned long qbytes; | |
146 | uid_t uid; | |
147 | gid_t gid; | |
148 | mode_t mode; | |
9c7aa6aa | 149 | u32 osid; |
1da177e4 LT |
150 | }; |
151 | ||
473ae30b AV |
152 | struct audit_aux_data_execve { |
153 | struct audit_aux_data d; | |
154 | int argc; | |
155 | int envc; | |
bdf4c48a | 156 | struct mm_struct *mm; |
473ae30b AV |
157 | }; |
158 | ||
3ec3b2fb DW |
159 | struct audit_aux_data_socketcall { |
160 | struct audit_aux_data d; | |
161 | int nargs; | |
162 | unsigned long args[0]; | |
163 | }; | |
164 | ||
165 | struct audit_aux_data_sockaddr { | |
166 | struct audit_aux_data d; | |
167 | int len; | |
168 | char a[0]; | |
169 | }; | |
170 | ||
db349509 AV |
171 | struct audit_aux_data_fd_pair { |
172 | struct audit_aux_data d; | |
173 | int fd[2]; | |
174 | }; | |
175 | ||
e54dc243 AG |
176 | struct audit_aux_data_pids { |
177 | struct audit_aux_data d; | |
178 | pid_t target_pid[AUDIT_AUX_PIDS]; | |
179 | u32 target_sid[AUDIT_AUX_PIDS]; | |
180 | int pid_count; | |
181 | }; | |
182 | ||
1da177e4 LT |
183 | /* The per-task audit context. */ |
184 | struct audit_context { | |
d51374ad | 185 | int dummy; /* must be the first element */ |
1da177e4 LT |
186 | int in_syscall; /* 1 if task is in a syscall */ |
187 | enum audit_state state; | |
188 | unsigned int serial; /* serial number for record */ | |
189 | struct timespec ctime; /* time of syscall entry */ | |
190 | uid_t loginuid; /* login uid (identity) */ | |
191 | int major; /* syscall number */ | |
192 | unsigned long argv[4]; /* syscall arguments */ | |
193 | int return_valid; /* return code is valid */ | |
2fd6f58b | 194 | long return_code;/* syscall return code */ |
1da177e4 LT |
195 | int auditable; /* 1 if record should be written */ |
196 | int name_count; | |
197 | struct audit_names names[AUDIT_NAMES]; | |
5adc8a6a | 198 | char * filterkey; /* key for rule that triggered record */ |
8f37d47c DW |
199 | struct dentry * pwd; |
200 | struct vfsmount * pwdmnt; | |
1da177e4 LT |
201 | struct audit_context *previous; /* For nested syscalls */ |
202 | struct audit_aux_data *aux; | |
e54dc243 | 203 | struct audit_aux_data *aux_pids; |
1da177e4 LT |
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 | 211 | |
a5cb013d AV |
212 | pid_t target_pid; |
213 | u32 target_sid; | |
214 | ||
1da177e4 LT |
215 | #if AUDIT_DEBUG |
216 | int put_count; | |
217 | int ino_count; | |
218 | #endif | |
219 | }; | |
220 | ||
55669bfa AV |
221 | #define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE]) |
222 | static inline int open_arg(int flags, int mask) | |
223 | { | |
224 | int n = ACC_MODE(flags); | |
225 | if (flags & (O_TRUNC | O_CREAT)) | |
226 | n |= AUDIT_PERM_WRITE; | |
227 | return n & mask; | |
228 | } | |
229 | ||
230 | static int audit_match_perm(struct audit_context *ctx, int mask) | |
231 | { | |
232 | unsigned n = ctx->major; | |
233 | switch (audit_classify_syscall(ctx->arch, n)) { | |
234 | case 0: /* native */ | |
235 | if ((mask & AUDIT_PERM_WRITE) && | |
236 | audit_match_class(AUDIT_CLASS_WRITE, n)) | |
237 | return 1; | |
238 | if ((mask & AUDIT_PERM_READ) && | |
239 | audit_match_class(AUDIT_CLASS_READ, n)) | |
240 | return 1; | |
241 | if ((mask & AUDIT_PERM_ATTR) && | |
242 | audit_match_class(AUDIT_CLASS_CHATTR, n)) | |
243 | return 1; | |
244 | return 0; | |
245 | case 1: /* 32bit on biarch */ | |
246 | if ((mask & AUDIT_PERM_WRITE) && | |
247 | audit_match_class(AUDIT_CLASS_WRITE_32, n)) | |
248 | return 1; | |
249 | if ((mask & AUDIT_PERM_READ) && | |
250 | audit_match_class(AUDIT_CLASS_READ_32, n)) | |
251 | return 1; | |
252 | if ((mask & AUDIT_PERM_ATTR) && | |
253 | audit_match_class(AUDIT_CLASS_CHATTR_32, n)) | |
254 | return 1; | |
255 | return 0; | |
256 | case 2: /* open */ | |
257 | return mask & ACC_MODE(ctx->argv[1]); | |
258 | case 3: /* openat */ | |
259 | return mask & ACC_MODE(ctx->argv[2]); | |
260 | case 4: /* socketcall */ | |
261 | return ((mask & AUDIT_PERM_WRITE) && ctx->argv[0] == SYS_BIND); | |
262 | case 5: /* execve */ | |
263 | return mask & AUDIT_PERM_EXEC; | |
264 | default: | |
265 | return 0; | |
266 | } | |
267 | } | |
268 | ||
f368c07d | 269 | /* Determine if any context name data matches a rule's watch data */ |
1da177e4 LT |
270 | /* Compare a task_struct with an audit_rule. Return 1 on match, 0 |
271 | * otherwise. */ | |
272 | static int audit_filter_rules(struct task_struct *tsk, | |
93315ed6 | 273 | struct audit_krule *rule, |
1da177e4 | 274 | struct audit_context *ctx, |
f368c07d | 275 | struct audit_names *name, |
1da177e4 LT |
276 | enum audit_state *state) |
277 | { | |
2ad312d2 | 278 | int i, j, need_sid = 1; |
3dc7e315 DG |
279 | u32 sid; |
280 | ||
1da177e4 | 281 | for (i = 0; i < rule->field_count; i++) { |
93315ed6 | 282 | struct audit_field *f = &rule->fields[i]; |
1da177e4 LT |
283 | int result = 0; |
284 | ||
93315ed6 | 285 | switch (f->type) { |
1da177e4 | 286 | case AUDIT_PID: |
93315ed6 | 287 | result = audit_comparator(tsk->pid, f->op, f->val); |
1da177e4 | 288 | break; |
3c66251e | 289 | case AUDIT_PPID: |
419c58f1 AV |
290 | if (ctx) { |
291 | if (!ctx->ppid) | |
292 | ctx->ppid = sys_getppid(); | |
3c66251e | 293 | result = audit_comparator(ctx->ppid, f->op, f->val); |
419c58f1 | 294 | } |
3c66251e | 295 | break; |
1da177e4 | 296 | case AUDIT_UID: |
93315ed6 | 297 | result = audit_comparator(tsk->uid, f->op, f->val); |
1da177e4 LT |
298 | break; |
299 | case AUDIT_EUID: | |
93315ed6 | 300 | result = audit_comparator(tsk->euid, f->op, f->val); |
1da177e4 LT |
301 | break; |
302 | case AUDIT_SUID: | |
93315ed6 | 303 | result = audit_comparator(tsk->suid, f->op, f->val); |
1da177e4 LT |
304 | break; |
305 | case AUDIT_FSUID: | |
93315ed6 | 306 | result = audit_comparator(tsk->fsuid, f->op, f->val); |
1da177e4 LT |
307 | break; |
308 | case AUDIT_GID: | |
93315ed6 | 309 | result = audit_comparator(tsk->gid, f->op, f->val); |
1da177e4 LT |
310 | break; |
311 | case AUDIT_EGID: | |
93315ed6 | 312 | result = audit_comparator(tsk->egid, f->op, f->val); |
1da177e4 LT |
313 | break; |
314 | case AUDIT_SGID: | |
93315ed6 | 315 | result = audit_comparator(tsk->sgid, f->op, f->val); |
1da177e4 LT |
316 | break; |
317 | case AUDIT_FSGID: | |
93315ed6 | 318 | result = audit_comparator(tsk->fsgid, f->op, f->val); |
1da177e4 LT |
319 | break; |
320 | case AUDIT_PERS: | |
93315ed6 | 321 | result = audit_comparator(tsk->personality, f->op, f->val); |
1da177e4 | 322 | break; |
2fd6f58b | 323 | case AUDIT_ARCH: |
b63862f4 | 324 | if (ctx) |
93315ed6 | 325 | result = audit_comparator(ctx->arch, f->op, f->val); |
2fd6f58b | 326 | break; |
1da177e4 LT |
327 | |
328 | case AUDIT_EXIT: | |
329 | if (ctx && ctx->return_valid) | |
93315ed6 | 330 | result = audit_comparator(ctx->return_code, f->op, f->val); |
1da177e4 LT |
331 | break; |
332 | case AUDIT_SUCCESS: | |
b01f2cc1 | 333 | if (ctx && ctx->return_valid) { |
93315ed6 AG |
334 | if (f->val) |
335 | result = audit_comparator(ctx->return_valid, f->op, AUDITSC_SUCCESS); | |
b01f2cc1 | 336 | else |
93315ed6 | 337 | result = audit_comparator(ctx->return_valid, f->op, AUDITSC_FAILURE); |
b01f2cc1 | 338 | } |
1da177e4 LT |
339 | break; |
340 | case AUDIT_DEVMAJOR: | |
f368c07d AG |
341 | if (name) |
342 | result = audit_comparator(MAJOR(name->dev), | |
343 | f->op, f->val); | |
344 | else if (ctx) { | |
1da177e4 | 345 | for (j = 0; j < ctx->name_count; j++) { |
93315ed6 | 346 | if (audit_comparator(MAJOR(ctx->names[j].dev), f->op, f->val)) { |
1da177e4 LT |
347 | ++result; |
348 | break; | |
349 | } | |
350 | } | |
351 | } | |
352 | break; | |
353 | case AUDIT_DEVMINOR: | |
f368c07d AG |
354 | if (name) |
355 | result = audit_comparator(MINOR(name->dev), | |
356 | f->op, f->val); | |
357 | else if (ctx) { | |
1da177e4 | 358 | for (j = 0; j < ctx->name_count; j++) { |
93315ed6 | 359 | if (audit_comparator(MINOR(ctx->names[j].dev), f->op, f->val)) { |
1da177e4 LT |
360 | ++result; |
361 | break; | |
362 | } | |
363 | } | |
364 | } | |
365 | break; | |
366 | case AUDIT_INODE: | |
f368c07d | 367 | if (name) |
9c937dcc | 368 | result = (name->ino == f->val); |
f368c07d | 369 | else if (ctx) { |
1da177e4 | 370 | for (j = 0; j < ctx->name_count; j++) { |
9c937dcc | 371 | if (audit_comparator(ctx->names[j].ino, f->op, f->val)) { |
1da177e4 LT |
372 | ++result; |
373 | break; | |
374 | } | |
375 | } | |
376 | } | |
377 | break; | |
f368c07d AG |
378 | case AUDIT_WATCH: |
379 | if (name && rule->watch->ino != (unsigned long)-1) | |
380 | result = (name->dev == rule->watch->dev && | |
9c937dcc | 381 | name->ino == rule->watch->ino); |
f368c07d | 382 | break; |
1da177e4 LT |
383 | case AUDIT_LOGINUID: |
384 | result = 0; | |
385 | if (ctx) | |
93315ed6 | 386 | result = audit_comparator(ctx->loginuid, f->op, f->val); |
1da177e4 | 387 | break; |
3a6b9f85 DG |
388 | case AUDIT_SUBJ_USER: |
389 | case AUDIT_SUBJ_ROLE: | |
390 | case AUDIT_SUBJ_TYPE: | |
391 | case AUDIT_SUBJ_SEN: | |
392 | case AUDIT_SUBJ_CLR: | |
3dc7e315 DG |
393 | /* NOTE: this may return negative values indicating |
394 | a temporary error. We simply treat this as a | |
395 | match for now to avoid losing information that | |
396 | may be wanted. An error message will also be | |
397 | logged upon error */ | |
2ad312d2 SG |
398 | if (f->se_rule) { |
399 | if (need_sid) { | |
62bac018 | 400 | selinux_get_task_sid(tsk, &sid); |
2ad312d2 SG |
401 | need_sid = 0; |
402 | } | |
3dc7e315 DG |
403 | result = selinux_audit_rule_match(sid, f->type, |
404 | f->op, | |
405 | f->se_rule, | |
406 | ctx); | |
2ad312d2 | 407 | } |
3dc7e315 | 408 | break; |
6e5a2d1d DG |
409 | case AUDIT_OBJ_USER: |
410 | case AUDIT_OBJ_ROLE: | |
411 | case AUDIT_OBJ_TYPE: | |
412 | case AUDIT_OBJ_LEV_LOW: | |
413 | case AUDIT_OBJ_LEV_HIGH: | |
414 | /* The above note for AUDIT_SUBJ_USER...AUDIT_SUBJ_CLR | |
415 | also applies here */ | |
416 | if (f->se_rule) { | |
417 | /* Find files that match */ | |
418 | if (name) { | |
419 | result = selinux_audit_rule_match( | |
420 | name->osid, f->type, f->op, | |
421 | f->se_rule, ctx); | |
422 | } else if (ctx) { | |
423 | for (j = 0; j < ctx->name_count; j++) { | |
424 | if (selinux_audit_rule_match( | |
425 | ctx->names[j].osid, | |
426 | f->type, f->op, | |
427 | f->se_rule, ctx)) { | |
428 | ++result; | |
429 | break; | |
430 | } | |
431 | } | |
432 | } | |
433 | /* Find ipc objects that match */ | |
434 | if (ctx) { | |
435 | struct audit_aux_data *aux; | |
436 | for (aux = ctx->aux; aux; | |
437 | aux = aux->next) { | |
438 | if (aux->type == AUDIT_IPC) { | |
439 | struct audit_aux_data_ipcctl *axi = (void *)aux; | |
440 | if (selinux_audit_rule_match(axi->osid, f->type, f->op, f->se_rule, ctx)) { | |
441 | ++result; | |
442 | break; | |
443 | } | |
444 | } | |
445 | } | |
446 | } | |
447 | } | |
448 | break; | |
1da177e4 LT |
449 | case AUDIT_ARG0: |
450 | case AUDIT_ARG1: | |
451 | case AUDIT_ARG2: | |
452 | case AUDIT_ARG3: | |
453 | if (ctx) | |
93315ed6 | 454 | result = audit_comparator(ctx->argv[f->type-AUDIT_ARG0], f->op, f->val); |
1da177e4 | 455 | break; |
5adc8a6a AG |
456 | case AUDIT_FILTERKEY: |
457 | /* ignore this field for filtering */ | |
458 | result = 1; | |
459 | break; | |
55669bfa AV |
460 | case AUDIT_PERM: |
461 | result = audit_match_perm(ctx, f->val); | |
462 | break; | |
1da177e4 LT |
463 | } |
464 | ||
1da177e4 LT |
465 | if (!result) |
466 | return 0; | |
467 | } | |
5adc8a6a AG |
468 | if (rule->filterkey) |
469 | ctx->filterkey = kstrdup(rule->filterkey, GFP_ATOMIC); | |
1da177e4 LT |
470 | switch (rule->action) { |
471 | case AUDIT_NEVER: *state = AUDIT_DISABLED; break; | |
1da177e4 LT |
472 | case AUDIT_ALWAYS: *state = AUDIT_RECORD_CONTEXT; break; |
473 | } | |
474 | return 1; | |
475 | } | |
476 | ||
477 | /* At process creation time, we can determine if system-call auditing is | |
478 | * completely disabled for this task. Since we only have the task | |
479 | * structure at this point, we can only check uid and gid. | |
480 | */ | |
481 | static enum audit_state audit_filter_task(struct task_struct *tsk) | |
482 | { | |
483 | struct audit_entry *e; | |
484 | enum audit_state state; | |
485 | ||
486 | rcu_read_lock(); | |
0f45aa18 | 487 | list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_TASK], list) { |
f368c07d | 488 | if (audit_filter_rules(tsk, &e->rule, NULL, NULL, &state)) { |
1da177e4 LT |
489 | rcu_read_unlock(); |
490 | return state; | |
491 | } | |
492 | } | |
493 | rcu_read_unlock(); | |
494 | return AUDIT_BUILD_CONTEXT; | |
495 | } | |
496 | ||
497 | /* At syscall entry and exit time, this filter is called if the | |
498 | * audit_state is not low enough that auditing cannot take place, but is | |
23f32d18 | 499 | * also not high enough that we already know we have to write an audit |
b0dd25a8 | 500 | * record (i.e., the state is AUDIT_SETUP_CONTEXT or AUDIT_BUILD_CONTEXT). |
1da177e4 LT |
501 | */ |
502 | static enum audit_state audit_filter_syscall(struct task_struct *tsk, | |
503 | struct audit_context *ctx, | |
504 | struct list_head *list) | |
505 | { | |
506 | struct audit_entry *e; | |
c3896495 | 507 | enum audit_state state; |
1da177e4 | 508 | |
351bb722 | 509 | if (audit_pid && tsk->tgid == audit_pid) |
f7056d64 DW |
510 | return AUDIT_DISABLED; |
511 | ||
1da177e4 | 512 | rcu_read_lock(); |
c3896495 | 513 | if (!list_empty(list)) { |
b63862f4 DK |
514 | int word = AUDIT_WORD(ctx->major); |
515 | int bit = AUDIT_BIT(ctx->major); | |
516 | ||
517 | list_for_each_entry_rcu(e, list, list) { | |
f368c07d AG |
518 | if ((e->rule.mask[word] & bit) == bit && |
519 | audit_filter_rules(tsk, &e->rule, ctx, NULL, | |
520 | &state)) { | |
521 | rcu_read_unlock(); | |
522 | return state; | |
523 | } | |
524 | } | |
525 | } | |
526 | rcu_read_unlock(); | |
527 | return AUDIT_BUILD_CONTEXT; | |
528 | } | |
529 | ||
530 | /* At syscall exit time, this filter is called if any audit_names[] have been | |
531 | * collected during syscall processing. We only check rules in sublists at hash | |
532 | * buckets applicable to the inode numbers in audit_names[]. | |
533 | * Regarding audit_state, same rules apply as for audit_filter_syscall(). | |
534 | */ | |
535 | enum audit_state audit_filter_inodes(struct task_struct *tsk, | |
536 | struct audit_context *ctx) | |
537 | { | |
538 | int i; | |
539 | struct audit_entry *e; | |
540 | enum audit_state state; | |
541 | ||
542 | if (audit_pid && tsk->tgid == audit_pid) | |
543 | return AUDIT_DISABLED; | |
544 | ||
545 | rcu_read_lock(); | |
546 | for (i = 0; i < ctx->name_count; i++) { | |
547 | int word = AUDIT_WORD(ctx->major); | |
548 | int bit = AUDIT_BIT(ctx->major); | |
549 | struct audit_names *n = &ctx->names[i]; | |
550 | int h = audit_hash_ino((u32)n->ino); | |
551 | struct list_head *list = &audit_inode_hash[h]; | |
552 | ||
553 | if (list_empty(list)) | |
554 | continue; | |
555 | ||
556 | list_for_each_entry_rcu(e, list, list) { | |
557 | if ((e->rule.mask[word] & bit) == bit && | |
558 | audit_filter_rules(tsk, &e->rule, ctx, n, &state)) { | |
b63862f4 DK |
559 | rcu_read_unlock(); |
560 | return state; | |
561 | } | |
0f45aa18 DW |
562 | } |
563 | } | |
564 | rcu_read_unlock(); | |
1da177e4 | 565 | return AUDIT_BUILD_CONTEXT; |
0f45aa18 DW |
566 | } |
567 | ||
f368c07d AG |
568 | void audit_set_auditable(struct audit_context *ctx) |
569 | { | |
570 | ctx->auditable = 1; | |
571 | } | |
572 | ||
1da177e4 LT |
573 | static inline struct audit_context *audit_get_context(struct task_struct *tsk, |
574 | int return_valid, | |
575 | int return_code) | |
576 | { | |
577 | struct audit_context *context = tsk->audit_context; | |
578 | ||
579 | if (likely(!context)) | |
580 | return NULL; | |
581 | context->return_valid = return_valid; | |
582 | context->return_code = return_code; | |
583 | ||
d51374ad | 584 | if (context->in_syscall && !context->dummy && !context->auditable) { |
1da177e4 | 585 | enum audit_state state; |
f368c07d | 586 | |
0f45aa18 | 587 | state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_EXIT]); |
f368c07d AG |
588 | if (state == AUDIT_RECORD_CONTEXT) { |
589 | context->auditable = 1; | |
590 | goto get_context; | |
591 | } | |
592 | ||
593 | state = audit_filter_inodes(tsk, context); | |
1da177e4 LT |
594 | if (state == AUDIT_RECORD_CONTEXT) |
595 | context->auditable = 1; | |
f368c07d | 596 | |
1da177e4 LT |
597 | } |
598 | ||
f368c07d | 599 | get_context: |
3f2792ff | 600 | |
1da177e4 LT |
601 | tsk->audit_context = NULL; |
602 | return context; | |
603 | } | |
604 | ||
605 | static inline void audit_free_names(struct audit_context *context) | |
606 | { | |
607 | int i; | |
608 | ||
609 | #if AUDIT_DEBUG == 2 | |
610 | if (context->auditable | |
611 | ||context->put_count + context->ino_count != context->name_count) { | |
73241ccc | 612 | printk(KERN_ERR "%s:%d(:%d): major=%d in_syscall=%d" |
1da177e4 LT |
613 | " name_count=%d put_count=%d" |
614 | " ino_count=%d [NOT freeing]\n", | |
73241ccc | 615 | __FILE__, __LINE__, |
1da177e4 LT |
616 | context->serial, context->major, context->in_syscall, |
617 | context->name_count, context->put_count, | |
618 | context->ino_count); | |
8c8570fb | 619 | for (i = 0; i < context->name_count; i++) { |
1da177e4 LT |
620 | printk(KERN_ERR "names[%d] = %p = %s\n", i, |
621 | context->names[i].name, | |
73241ccc | 622 | context->names[i].name ?: "(null)"); |
8c8570fb | 623 | } |
1da177e4 LT |
624 | dump_stack(); |
625 | return; | |
626 | } | |
627 | #endif | |
628 | #if AUDIT_DEBUG | |
629 | context->put_count = 0; | |
630 | context->ino_count = 0; | |
631 | #endif | |
632 | ||
8c8570fb | 633 | for (i = 0; i < context->name_count; i++) { |
9c937dcc | 634 | if (context->names[i].name && context->names[i].name_put) |
1da177e4 | 635 | __putname(context->names[i].name); |
8c8570fb | 636 | } |
1da177e4 | 637 | context->name_count = 0; |
8f37d47c DW |
638 | if (context->pwd) |
639 | dput(context->pwd); | |
640 | if (context->pwdmnt) | |
641 | mntput(context->pwdmnt); | |
642 | context->pwd = NULL; | |
643 | context->pwdmnt = NULL; | |
1da177e4 LT |
644 | } |
645 | ||
646 | static inline void audit_free_aux(struct audit_context *context) | |
647 | { | |
648 | struct audit_aux_data *aux; | |
649 | ||
650 | while ((aux = context->aux)) { | |
651 | context->aux = aux->next; | |
652 | kfree(aux); | |
653 | } | |
e54dc243 AG |
654 | while ((aux = context->aux_pids)) { |
655 | context->aux_pids = aux->next; | |
656 | kfree(aux); | |
657 | } | |
1da177e4 LT |
658 | } |
659 | ||
660 | static inline void audit_zero_context(struct audit_context *context, | |
661 | enum audit_state state) | |
662 | { | |
663 | uid_t loginuid = context->loginuid; | |
664 | ||
665 | memset(context, 0, sizeof(*context)); | |
666 | context->state = state; | |
667 | context->loginuid = loginuid; | |
668 | } | |
669 | ||
670 | static inline struct audit_context *audit_alloc_context(enum audit_state state) | |
671 | { | |
672 | struct audit_context *context; | |
673 | ||
674 | if (!(context = kmalloc(sizeof(*context), GFP_KERNEL))) | |
675 | return NULL; | |
676 | audit_zero_context(context, state); | |
677 | return context; | |
678 | } | |
679 | ||
b0dd25a8 RD |
680 | /** |
681 | * audit_alloc - allocate an audit context block for a task | |
682 | * @tsk: task | |
683 | * | |
684 | * Filter on the task information and allocate a per-task audit context | |
1da177e4 LT |
685 | * if necessary. Doing so turns on system call auditing for the |
686 | * specified task. This is called from copy_process, so no lock is | |
b0dd25a8 RD |
687 | * needed. |
688 | */ | |
1da177e4 LT |
689 | int audit_alloc(struct task_struct *tsk) |
690 | { | |
691 | struct audit_context *context; | |
692 | enum audit_state state; | |
693 | ||
694 | if (likely(!audit_enabled)) | |
695 | return 0; /* Return if not auditing. */ | |
696 | ||
697 | state = audit_filter_task(tsk); | |
698 | if (likely(state == AUDIT_DISABLED)) | |
699 | return 0; | |
700 | ||
701 | if (!(context = audit_alloc_context(state))) { | |
702 | audit_log_lost("out of memory in audit_alloc"); | |
703 | return -ENOMEM; | |
704 | } | |
705 | ||
706 | /* Preserve login uid */ | |
707 | context->loginuid = -1; | |
708 | if (current->audit_context) | |
709 | context->loginuid = current->audit_context->loginuid; | |
710 | ||
711 | tsk->audit_context = context; | |
712 | set_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT); | |
713 | return 0; | |
714 | } | |
715 | ||
716 | static inline void audit_free_context(struct audit_context *context) | |
717 | { | |
718 | struct audit_context *previous; | |
719 | int count = 0; | |
720 | ||
721 | do { | |
722 | previous = context->previous; | |
723 | if (previous || (count && count < 10)) { | |
724 | ++count; | |
725 | printk(KERN_ERR "audit(:%d): major=%d name_count=%d:" | |
726 | " freeing multiple contexts (%d)\n", | |
727 | context->serial, context->major, | |
728 | context->name_count, count); | |
729 | } | |
730 | audit_free_names(context); | |
731 | audit_free_aux(context); | |
5adc8a6a | 732 | kfree(context->filterkey); |
1da177e4 LT |
733 | kfree(context); |
734 | context = previous; | |
735 | } while (context); | |
736 | if (count >= 10) | |
737 | printk(KERN_ERR "audit: freed %d contexts\n", count); | |
738 | } | |
739 | ||
161a09e7 | 740 | void audit_log_task_context(struct audit_buffer *ab) |
8c8570fb DK |
741 | { |
742 | char *ctx = NULL; | |
c4823bce AV |
743 | unsigned len; |
744 | int error; | |
745 | u32 sid; | |
746 | ||
747 | selinux_get_task_sid(current, &sid); | |
748 | if (!sid) | |
749 | return; | |
8c8570fb | 750 | |
c4823bce AV |
751 | error = selinux_sid_to_string(sid, &ctx, &len); |
752 | if (error) { | |
753 | if (error != -EINVAL) | |
8c8570fb DK |
754 | goto error_path; |
755 | return; | |
756 | } | |
757 | ||
8c8570fb | 758 | audit_log_format(ab, " subj=%s", ctx); |
c4823bce | 759 | kfree(ctx); |
7306a0b9 | 760 | return; |
8c8570fb DK |
761 | |
762 | error_path: | |
7306a0b9 | 763 | audit_panic("error in audit_log_task_context"); |
8c8570fb DK |
764 | return; |
765 | } | |
766 | ||
161a09e7 JL |
767 | EXPORT_SYMBOL(audit_log_task_context); |
768 | ||
e495149b | 769 | static void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk) |
219f0817 | 770 | { |
45d9bb0e AV |
771 | char name[sizeof(tsk->comm)]; |
772 | struct mm_struct *mm = tsk->mm; | |
219f0817 SS |
773 | struct vm_area_struct *vma; |
774 | ||
e495149b AV |
775 | /* tsk == current */ |
776 | ||
45d9bb0e | 777 | get_task_comm(name, tsk); |
99e45eea DW |
778 | audit_log_format(ab, " comm="); |
779 | audit_log_untrustedstring(ab, name); | |
219f0817 | 780 | |
e495149b AV |
781 | if (mm) { |
782 | down_read(&mm->mmap_sem); | |
783 | vma = mm->mmap; | |
784 | while (vma) { | |
785 | if ((vma->vm_flags & VM_EXECUTABLE) && | |
786 | vma->vm_file) { | |
787 | audit_log_d_path(ab, "exe=", | |
a7a005fd JS |
788 | vma->vm_file->f_path.dentry, |
789 | vma->vm_file->f_path.mnt); | |
e495149b AV |
790 | break; |
791 | } | |
792 | vma = vma->vm_next; | |
219f0817 | 793 | } |
e495149b | 794 | up_read(&mm->mmap_sem); |
219f0817 | 795 | } |
e495149b | 796 | audit_log_task_context(ab); |
219f0817 SS |
797 | } |
798 | ||
e54dc243 AG |
799 | static int audit_log_pid_context(struct audit_context *context, pid_t pid, |
800 | u32 sid) | |
801 | { | |
802 | struct audit_buffer *ab; | |
803 | char *s = NULL; | |
804 | u32 len; | |
805 | int rc = 0; | |
806 | ||
807 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID); | |
808 | if (!ab) | |
809 | return 1; | |
810 | ||
811 | if (selinux_sid_to_string(sid, &s, &len)) { | |
812 | audit_log_format(ab, "opid=%d obj=(none)", pid); | |
813 | rc = 1; | |
814 | } else | |
815 | audit_log_format(ab, "opid=%d obj=%s", pid, s); | |
816 | audit_log_end(ab); | |
817 | kfree(s); | |
818 | ||
819 | return rc; | |
820 | } | |
821 | ||
bdf4c48a PZ |
822 | static void audit_log_execve_info(struct audit_buffer *ab, |
823 | struct audit_aux_data_execve *axi) | |
824 | { | |
825 | int i; | |
826 | long len, ret; | |
040b3a2d | 827 | const char __user *p; |
bdf4c48a PZ |
828 | char *buf; |
829 | ||
830 | if (axi->mm != current->mm) | |
831 | return; /* execve failed, no additional info */ | |
832 | ||
040b3a2d PZ |
833 | p = (const char __user *)axi->mm->arg_start; |
834 | ||
bdf4c48a | 835 | for (i = 0; i < axi->argc; i++, p += len) { |
b6a2fea3 | 836 | len = strnlen_user(p, MAX_ARG_STRLEN); |
bdf4c48a PZ |
837 | /* |
838 | * We just created this mm, if we can't find the strings | |
839 | * we just copied into it something is _very_ wrong. Similar | |
840 | * for strings that are too long, we should not have created | |
841 | * any. | |
842 | */ | |
843 | if (!len || len > MAX_ARG_STRLEN) { | |
844 | WARN_ON(1); | |
845 | send_sig(SIGKILL, current, 0); | |
846 | } | |
847 | ||
848 | buf = kmalloc(len, GFP_KERNEL); | |
849 | if (!buf) { | |
850 | audit_panic("out of memory for argv string\n"); | |
851 | break; | |
852 | } | |
853 | ||
854 | ret = copy_from_user(buf, p, len); | |
855 | /* | |
856 | * There is no reason for this copy to be short. We just | |
857 | * copied them here, and the mm hasn't been exposed to user- | |
858 | * space yet. | |
859 | */ | |
040b3a2d | 860 | if (ret) { |
bdf4c48a PZ |
861 | WARN_ON(1); |
862 | send_sig(SIGKILL, current, 0); | |
863 | } | |
864 | ||
865 | audit_log_format(ab, "a%d=", i); | |
866 | audit_log_untrustedstring(ab, buf); | |
867 | audit_log_format(ab, "\n"); | |
868 | ||
869 | kfree(buf); | |
870 | } | |
871 | } | |
872 | ||
e495149b | 873 | static void audit_log_exit(struct audit_context *context, struct task_struct *tsk) |
1da177e4 | 874 | { |
9c7aa6aa | 875 | int i, call_panic = 0; |
1da177e4 | 876 | struct audit_buffer *ab; |
7551ced3 | 877 | struct audit_aux_data *aux; |
a6c043a8 | 878 | const char *tty; |
1da177e4 | 879 | |
e495149b | 880 | /* tsk == current */ |
3f2792ff | 881 | context->pid = tsk->pid; |
419c58f1 AV |
882 | if (!context->ppid) |
883 | context->ppid = sys_getppid(); | |
3f2792ff AV |
884 | context->uid = tsk->uid; |
885 | context->gid = tsk->gid; | |
886 | context->euid = tsk->euid; | |
887 | context->suid = tsk->suid; | |
888 | context->fsuid = tsk->fsuid; | |
889 | context->egid = tsk->egid; | |
890 | context->sgid = tsk->sgid; | |
891 | context->fsgid = tsk->fsgid; | |
892 | context->personality = tsk->personality; | |
e495149b AV |
893 | |
894 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_SYSCALL); | |
1da177e4 LT |
895 | if (!ab) |
896 | return; /* audit_panic has been called */ | |
bccf6ae0 DW |
897 | audit_log_format(ab, "arch=%x syscall=%d", |
898 | context->arch, context->major); | |
1da177e4 LT |
899 | if (context->personality != PER_LINUX) |
900 | audit_log_format(ab, " per=%lx", context->personality); | |
901 | if (context->return_valid) | |
2fd6f58b DW |
902 | audit_log_format(ab, " success=%s exit=%ld", |
903 | (context->return_valid==AUDITSC_SUCCESS)?"yes":"no", | |
904 | context->return_code); | |
eb84a20e AC |
905 | |
906 | mutex_lock(&tty_mutex); | |
24ec839c | 907 | read_lock(&tasklist_lock); |
45d9bb0e AV |
908 | if (tsk->signal && tsk->signal->tty && tsk->signal->tty->name) |
909 | tty = tsk->signal->tty->name; | |
a6c043a8 SG |
910 | else |
911 | tty = "(none)"; | |
24ec839c | 912 | read_unlock(&tasklist_lock); |
1da177e4 LT |
913 | audit_log_format(ab, |
914 | " a0=%lx a1=%lx a2=%lx a3=%lx items=%d" | |
f46038ff | 915 | " ppid=%d pid=%d auid=%u uid=%u gid=%u" |
326e9c8b | 916 | " euid=%u suid=%u fsuid=%u" |
a6c043a8 | 917 | " egid=%u sgid=%u fsgid=%u tty=%s", |
1da177e4 LT |
918 | context->argv[0], |
919 | context->argv[1], | |
920 | context->argv[2], | |
921 | context->argv[3], | |
922 | context->name_count, | |
f46038ff | 923 | context->ppid, |
1da177e4 LT |
924 | context->pid, |
925 | context->loginuid, | |
926 | context->uid, | |
927 | context->gid, | |
928 | context->euid, context->suid, context->fsuid, | |
a6c043a8 | 929 | context->egid, context->sgid, context->fsgid, tty); |
eb84a20e AC |
930 | |
931 | mutex_unlock(&tty_mutex); | |
932 | ||
e495149b | 933 | audit_log_task_info(ab, tsk); |
5adc8a6a AG |
934 | if (context->filterkey) { |
935 | audit_log_format(ab, " key="); | |
936 | audit_log_untrustedstring(ab, context->filterkey); | |
937 | } else | |
938 | audit_log_format(ab, " key=(null)"); | |
1da177e4 | 939 | audit_log_end(ab); |
1da177e4 | 940 | |
7551ced3 | 941 | for (aux = context->aux; aux; aux = aux->next) { |
c0404993 | 942 | |
e495149b | 943 | ab = audit_log_start(context, GFP_KERNEL, aux->type); |
1da177e4 LT |
944 | if (!ab) |
945 | continue; /* audit_panic has been called */ | |
946 | ||
1da177e4 | 947 | switch (aux->type) { |
20ca73bc GW |
948 | case AUDIT_MQ_OPEN: { |
949 | struct audit_aux_data_mq_open *axi = (void *)aux; | |
950 | audit_log_format(ab, | |
951 | "oflag=0x%x mode=%#o mq_flags=0x%lx mq_maxmsg=%ld " | |
952 | "mq_msgsize=%ld mq_curmsgs=%ld", | |
953 | axi->oflag, axi->mode, axi->attr.mq_flags, | |
954 | axi->attr.mq_maxmsg, axi->attr.mq_msgsize, | |
955 | axi->attr.mq_curmsgs); | |
956 | break; } | |
957 | ||
958 | case AUDIT_MQ_SENDRECV: { | |
959 | struct audit_aux_data_mq_sendrecv *axi = (void *)aux; | |
960 | audit_log_format(ab, | |
961 | "mqdes=%d msg_len=%zd msg_prio=%u " | |
962 | "abs_timeout_sec=%ld abs_timeout_nsec=%ld", | |
963 | axi->mqdes, axi->msg_len, axi->msg_prio, | |
964 | axi->abs_timeout.tv_sec, axi->abs_timeout.tv_nsec); | |
965 | break; } | |
966 | ||
967 | case AUDIT_MQ_NOTIFY: { | |
968 | struct audit_aux_data_mq_notify *axi = (void *)aux; | |
969 | audit_log_format(ab, | |
970 | "mqdes=%d sigev_signo=%d", | |
971 | axi->mqdes, | |
972 | axi->notification.sigev_signo); | |
973 | break; } | |
974 | ||
975 | case AUDIT_MQ_GETSETATTR: { | |
976 | struct audit_aux_data_mq_getsetattr *axi = (void *)aux; | |
977 | audit_log_format(ab, | |
978 | "mqdes=%d mq_flags=0x%lx mq_maxmsg=%ld mq_msgsize=%ld " | |
979 | "mq_curmsgs=%ld ", | |
980 | axi->mqdes, | |
981 | axi->mqstat.mq_flags, axi->mqstat.mq_maxmsg, | |
982 | axi->mqstat.mq_msgsize, axi->mqstat.mq_curmsgs); | |
983 | break; } | |
984 | ||
c0404993 | 985 | case AUDIT_IPC: { |
1da177e4 LT |
986 | struct audit_aux_data_ipcctl *axi = (void *)aux; |
987 | audit_log_format(ab, | |
5b9a4262 | 988 | "ouid=%u ogid=%u mode=%#o", |
ac03221a | 989 | axi->uid, axi->gid, axi->mode); |
9c7aa6aa SG |
990 | if (axi->osid != 0) { |
991 | char *ctx = NULL; | |
992 | u32 len; | |
1a70cd40 | 993 | if (selinux_sid_to_string( |
9c7aa6aa | 994 | axi->osid, &ctx, &len)) { |
ce29b682 | 995 | audit_log_format(ab, " osid=%u", |
9c7aa6aa SG |
996 | axi->osid); |
997 | call_panic = 1; | |
998 | } else | |
999 | audit_log_format(ab, " obj=%s", ctx); | |
1000 | kfree(ctx); | |
1001 | } | |
3ec3b2fb DW |
1002 | break; } |
1003 | ||
073115d6 SG |
1004 | case AUDIT_IPC_SET_PERM: { |
1005 | struct audit_aux_data_ipcctl *axi = (void *)aux; | |
1006 | audit_log_format(ab, | |
5b9a4262 | 1007 | "qbytes=%lx ouid=%u ogid=%u mode=%#o", |
073115d6 | 1008 | axi->qbytes, axi->uid, axi->gid, axi->mode); |
073115d6 | 1009 | break; } |
ac03221a | 1010 | |
473ae30b AV |
1011 | case AUDIT_EXECVE: { |
1012 | struct audit_aux_data_execve *axi = (void *)aux; | |
bdf4c48a | 1013 | audit_log_execve_info(ab, axi); |
473ae30b | 1014 | break; } |
073115d6 | 1015 | |
3ec3b2fb DW |
1016 | case AUDIT_SOCKETCALL: { |
1017 | int i; | |
1018 | struct audit_aux_data_socketcall *axs = (void *)aux; | |
1019 | audit_log_format(ab, "nargs=%d", axs->nargs); | |
1020 | for (i=0; i<axs->nargs; i++) | |
1021 | audit_log_format(ab, " a%d=%lx", i, axs->args[i]); | |
1022 | break; } | |
1023 | ||
1024 | case AUDIT_SOCKADDR: { | |
1025 | struct audit_aux_data_sockaddr *axs = (void *)aux; | |
1026 | ||
1027 | audit_log_format(ab, "saddr="); | |
1028 | audit_log_hex(ab, axs->a, axs->len); | |
1029 | break; } | |
01116105 | 1030 | |
db349509 AV |
1031 | case AUDIT_FD_PAIR: { |
1032 | struct audit_aux_data_fd_pair *axs = (void *)aux; | |
1033 | audit_log_format(ab, "fd0=%d fd1=%d", axs->fd[0], axs->fd[1]); | |
1034 | break; } | |
1035 | ||
1da177e4 LT |
1036 | } |
1037 | audit_log_end(ab); | |
1da177e4 LT |
1038 | } |
1039 | ||
e54dc243 AG |
1040 | for (aux = context->aux_pids; aux; aux = aux->next) { |
1041 | struct audit_aux_data_pids *axs = (void *)aux; | |
1042 | int i; | |
1043 | ||
1044 | for (i = 0; i < axs->pid_count; i++) | |
1045 | if (audit_log_pid_context(context, axs->target_pid[i], | |
1046 | axs->target_sid[i])) | |
1047 | call_panic = 1; | |
a5cb013d AV |
1048 | } |
1049 | ||
e54dc243 AG |
1050 | if (context->target_pid && |
1051 | audit_log_pid_context(context, context->target_pid, | |
1052 | context->target_sid)) | |
1053 | call_panic = 1; | |
1054 | ||
8f37d47c | 1055 | if (context->pwd && context->pwdmnt) { |
e495149b | 1056 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD); |
8f37d47c DW |
1057 | if (ab) { |
1058 | audit_log_d_path(ab, "cwd=", context->pwd, context->pwdmnt); | |
1059 | audit_log_end(ab); | |
1060 | } | |
1061 | } | |
1da177e4 | 1062 | for (i = 0; i < context->name_count; i++) { |
9c937dcc | 1063 | struct audit_names *n = &context->names[i]; |
73241ccc | 1064 | |
e495149b | 1065 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_PATH); |
1da177e4 LT |
1066 | if (!ab) |
1067 | continue; /* audit_panic has been called */ | |
8f37d47c | 1068 | |
1da177e4 | 1069 | audit_log_format(ab, "item=%d", i); |
73241ccc | 1070 | |
9c937dcc AG |
1071 | if (n->name) { |
1072 | switch(n->name_len) { | |
1073 | case AUDIT_NAME_FULL: | |
1074 | /* log the full path */ | |
1075 | audit_log_format(ab, " name="); | |
1076 | audit_log_untrustedstring(ab, n->name); | |
1077 | break; | |
1078 | case 0: | |
1079 | /* name was specified as a relative path and the | |
1080 | * directory component is the cwd */ | |
1081 | audit_log_d_path(ab, " name=", context->pwd, | |
1082 | context->pwdmnt); | |
1083 | break; | |
1084 | default: | |
1085 | /* log the name's directory component */ | |
1086 | audit_log_format(ab, " name="); | |
1087 | audit_log_n_untrustedstring(ab, n->name_len, | |
1088 | n->name); | |
1089 | } | |
1090 | } else | |
1091 | audit_log_format(ab, " name=(null)"); | |
1092 | ||
1093 | if (n->ino != (unsigned long)-1) { | |
1094 | audit_log_format(ab, " inode=%lu" | |
1095 | " dev=%02x:%02x mode=%#o" | |
1096 | " ouid=%u ogid=%u rdev=%02x:%02x", | |
1097 | n->ino, | |
1098 | MAJOR(n->dev), | |
1099 | MINOR(n->dev), | |
1100 | n->mode, | |
1101 | n->uid, | |
1102 | n->gid, | |
1103 | MAJOR(n->rdev), | |
1104 | MINOR(n->rdev)); | |
1105 | } | |
1106 | if (n->osid != 0) { | |
1b50eed9 SG |
1107 | char *ctx = NULL; |
1108 | u32 len; | |
1a70cd40 | 1109 | if (selinux_sid_to_string( |
9c937dcc AG |
1110 | n->osid, &ctx, &len)) { |
1111 | audit_log_format(ab, " osid=%u", n->osid); | |
9c7aa6aa | 1112 | call_panic = 2; |
1b50eed9 SG |
1113 | } else |
1114 | audit_log_format(ab, " obj=%s", ctx); | |
1115 | kfree(ctx); | |
8c8570fb DK |
1116 | } |
1117 | ||
1da177e4 LT |
1118 | audit_log_end(ab); |
1119 | } | |
9c7aa6aa SG |
1120 | if (call_panic) |
1121 | audit_panic("error converting sid to string"); | |
1da177e4 LT |
1122 | } |
1123 | ||
b0dd25a8 RD |
1124 | /** |
1125 | * audit_free - free a per-task audit context | |
1126 | * @tsk: task whose audit context block to free | |
1127 | * | |
fa84cb93 | 1128 | * Called from copy_process and do_exit |
b0dd25a8 | 1129 | */ |
1da177e4 LT |
1130 | void audit_free(struct task_struct *tsk) |
1131 | { | |
1132 | struct audit_context *context; | |
1133 | ||
1da177e4 | 1134 | context = audit_get_context(tsk, 0, 0); |
1da177e4 LT |
1135 | if (likely(!context)) |
1136 | return; | |
1137 | ||
1138 | /* Check for system calls that do not go through the exit | |
f5561964 DW |
1139 | * function (e.g., exit_group), then free context block. |
1140 | * We use GFP_ATOMIC here because we might be doing this | |
1141 | * in the context of the idle thread */ | |
e495149b | 1142 | /* that can happen only if we are called from do_exit() */ |
f7056d64 | 1143 | if (context->in_syscall && context->auditable) |
e495149b | 1144 | audit_log_exit(context, tsk); |
1da177e4 LT |
1145 | |
1146 | audit_free_context(context); | |
1147 | } | |
1148 | ||
b0dd25a8 RD |
1149 | /** |
1150 | * audit_syscall_entry - fill in an audit record at syscall entry | |
1151 | * @tsk: task being audited | |
1152 | * @arch: architecture type | |
1153 | * @major: major syscall type (function) | |
1154 | * @a1: additional syscall register 1 | |
1155 | * @a2: additional syscall register 2 | |
1156 | * @a3: additional syscall register 3 | |
1157 | * @a4: additional syscall register 4 | |
1158 | * | |
1159 | * Fill in audit context at syscall entry. This only happens if the | |
1da177e4 LT |
1160 | * audit context was created when the task was created and the state or |
1161 | * filters demand the audit context be built. If the state from the | |
1162 | * per-task filter or from the per-syscall filter is AUDIT_RECORD_CONTEXT, | |
1163 | * then the record will be written at syscall exit time (otherwise, it | |
1164 | * will only be written if another part of the kernel requests that it | |
b0dd25a8 RD |
1165 | * be written). |
1166 | */ | |
5411be59 | 1167 | void audit_syscall_entry(int arch, int major, |
1da177e4 LT |
1168 | unsigned long a1, unsigned long a2, |
1169 | unsigned long a3, unsigned long a4) | |
1170 | { | |
5411be59 | 1171 | struct task_struct *tsk = current; |
1da177e4 LT |
1172 | struct audit_context *context = tsk->audit_context; |
1173 | enum audit_state state; | |
1174 | ||
1175 | BUG_ON(!context); | |
1176 | ||
b0dd25a8 RD |
1177 | /* |
1178 | * This happens only on certain architectures that make system | |
1da177e4 LT |
1179 | * calls in kernel_thread via the entry.S interface, instead of |
1180 | * with direct calls. (If you are porting to a new | |
1181 | * architecture, hitting this condition can indicate that you | |
1182 | * got the _exit/_leave calls backward in entry.S.) | |
1183 | * | |
1184 | * i386 no | |
1185 | * x86_64 no | |
2ef9481e | 1186 | * ppc64 yes (see arch/powerpc/platforms/iseries/misc.S) |
1da177e4 LT |
1187 | * |
1188 | * This also happens with vm86 emulation in a non-nested manner | |
1189 | * (entries without exits), so this case must be caught. | |
1190 | */ | |
1191 | if (context->in_syscall) { | |
1192 | struct audit_context *newctx; | |
1193 | ||
1da177e4 LT |
1194 | #if AUDIT_DEBUG |
1195 | printk(KERN_ERR | |
1196 | "audit(:%d) pid=%d in syscall=%d;" | |
1197 | " entering syscall=%d\n", | |
1198 | context->serial, tsk->pid, context->major, major); | |
1199 | #endif | |
1200 | newctx = audit_alloc_context(context->state); | |
1201 | if (newctx) { | |
1202 | newctx->previous = context; | |
1203 | context = newctx; | |
1204 | tsk->audit_context = newctx; | |
1205 | } else { | |
1206 | /* If we can't alloc a new context, the best we | |
1207 | * can do is to leak memory (any pending putname | |
1208 | * will be lost). The only other alternative is | |
1209 | * to abandon auditing. */ | |
1210 | audit_zero_context(context, context->state); | |
1211 | } | |
1212 | } | |
1213 | BUG_ON(context->in_syscall || context->name_count); | |
1214 | ||
1215 | if (!audit_enabled) | |
1216 | return; | |
1217 | ||
2fd6f58b | 1218 | context->arch = arch; |
1da177e4 LT |
1219 | context->major = major; |
1220 | context->argv[0] = a1; | |
1221 | context->argv[1] = a2; | |
1222 | context->argv[2] = a3; | |
1223 | context->argv[3] = a4; | |
1224 | ||
1225 | state = context->state; | |
d51374ad AV |
1226 | context->dummy = !audit_n_rules; |
1227 | if (!context->dummy && (state == AUDIT_SETUP_CONTEXT || state == AUDIT_BUILD_CONTEXT)) | |
0f45aa18 | 1228 | state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_ENTRY]); |
1da177e4 LT |
1229 | if (likely(state == AUDIT_DISABLED)) |
1230 | return; | |
1231 | ||
ce625a80 | 1232 | context->serial = 0; |
1da177e4 LT |
1233 | context->ctime = CURRENT_TIME; |
1234 | context->in_syscall = 1; | |
1235 | context->auditable = !!(state == AUDIT_RECORD_CONTEXT); | |
419c58f1 | 1236 | context->ppid = 0; |
1da177e4 LT |
1237 | } |
1238 | ||
b0dd25a8 RD |
1239 | /** |
1240 | * audit_syscall_exit - deallocate audit context after a system call | |
1241 | * @tsk: task being audited | |
1242 | * @valid: success/failure flag | |
1243 | * @return_code: syscall return value | |
1244 | * | |
1245 | * Tear down after system call. If the audit context has been marked as | |
1da177e4 LT |
1246 | * auditable (either because of the AUDIT_RECORD_CONTEXT state from |
1247 | * filtering, or because some other part of the kernel write an audit | |
1248 | * message), then write out the syscall information. In call cases, | |
b0dd25a8 RD |
1249 | * free the names stored from getname(). |
1250 | */ | |
5411be59 | 1251 | void audit_syscall_exit(int valid, long return_code) |
1da177e4 | 1252 | { |
5411be59 | 1253 | struct task_struct *tsk = current; |
1da177e4 LT |
1254 | struct audit_context *context; |
1255 | ||
2fd6f58b | 1256 | context = audit_get_context(tsk, valid, return_code); |
1da177e4 | 1257 | |
1da177e4 | 1258 | if (likely(!context)) |
97e94c45 | 1259 | return; |
1da177e4 | 1260 | |
f7056d64 | 1261 | if (context->in_syscall && context->auditable) |
e495149b | 1262 | audit_log_exit(context, tsk); |
1da177e4 LT |
1263 | |
1264 | context->in_syscall = 0; | |
1265 | context->auditable = 0; | |
2fd6f58b | 1266 | |
1da177e4 LT |
1267 | if (context->previous) { |
1268 | struct audit_context *new_context = context->previous; | |
1269 | context->previous = NULL; | |
1270 | audit_free_context(context); | |
1271 | tsk->audit_context = new_context; | |
1272 | } else { | |
1273 | audit_free_names(context); | |
1274 | audit_free_aux(context); | |
e54dc243 AG |
1275 | context->aux = NULL; |
1276 | context->aux_pids = NULL; | |
a5cb013d | 1277 | context->target_pid = 0; |
e54dc243 | 1278 | context->target_sid = 0; |
5adc8a6a AG |
1279 | kfree(context->filterkey); |
1280 | context->filterkey = NULL; | |
1da177e4 LT |
1281 | tsk->audit_context = context; |
1282 | } | |
1da177e4 LT |
1283 | } |
1284 | ||
b0dd25a8 RD |
1285 | /** |
1286 | * audit_getname - add a name to the list | |
1287 | * @name: name to add | |
1288 | * | |
1289 | * Add a name to the list of audit names for this context. | |
1290 | * Called from fs/namei.c:getname(). | |
1291 | */ | |
d8945bb5 | 1292 | void __audit_getname(const char *name) |
1da177e4 LT |
1293 | { |
1294 | struct audit_context *context = current->audit_context; | |
1295 | ||
d8945bb5 | 1296 | if (IS_ERR(name) || !name) |
1da177e4 LT |
1297 | return; |
1298 | ||
1299 | if (!context->in_syscall) { | |
1300 | #if AUDIT_DEBUG == 2 | |
1301 | printk(KERN_ERR "%s:%d(:%d): ignoring getname(%p)\n", | |
1302 | __FILE__, __LINE__, context->serial, name); | |
1303 | dump_stack(); | |
1304 | #endif | |
1305 | return; | |
1306 | } | |
1307 | BUG_ON(context->name_count >= AUDIT_NAMES); | |
1308 | context->names[context->name_count].name = name; | |
9c937dcc AG |
1309 | context->names[context->name_count].name_len = AUDIT_NAME_FULL; |
1310 | context->names[context->name_count].name_put = 1; | |
1da177e4 | 1311 | context->names[context->name_count].ino = (unsigned long)-1; |
e41e8bde | 1312 | context->names[context->name_count].osid = 0; |
1da177e4 | 1313 | ++context->name_count; |
8f37d47c DW |
1314 | if (!context->pwd) { |
1315 | read_lock(¤t->fs->lock); | |
1316 | context->pwd = dget(current->fs->pwd); | |
1317 | context->pwdmnt = mntget(current->fs->pwdmnt); | |
1318 | read_unlock(¤t->fs->lock); | |
1319 | } | |
1320 | ||
1da177e4 LT |
1321 | } |
1322 | ||
b0dd25a8 RD |
1323 | /* audit_putname - intercept a putname request |
1324 | * @name: name to intercept and delay for putname | |
1325 | * | |
1326 | * If we have stored the name from getname in the audit context, | |
1327 | * then we delay the putname until syscall exit. | |
1328 | * Called from include/linux/fs.h:putname(). | |
1329 | */ | |
1da177e4 LT |
1330 | void audit_putname(const char *name) |
1331 | { | |
1332 | struct audit_context *context = current->audit_context; | |
1333 | ||
1334 | BUG_ON(!context); | |
1335 | if (!context->in_syscall) { | |
1336 | #if AUDIT_DEBUG == 2 | |
1337 | printk(KERN_ERR "%s:%d(:%d): __putname(%p)\n", | |
1338 | __FILE__, __LINE__, context->serial, name); | |
1339 | if (context->name_count) { | |
1340 | int i; | |
1341 | for (i = 0; i < context->name_count; i++) | |
1342 | printk(KERN_ERR "name[%d] = %p = %s\n", i, | |
1343 | context->names[i].name, | |
73241ccc | 1344 | context->names[i].name ?: "(null)"); |
1da177e4 LT |
1345 | } |
1346 | #endif | |
1347 | __putname(name); | |
1348 | } | |
1349 | #if AUDIT_DEBUG | |
1350 | else { | |
1351 | ++context->put_count; | |
1352 | if (context->put_count > context->name_count) { | |
1353 | printk(KERN_ERR "%s:%d(:%d): major=%d" | |
1354 | " in_syscall=%d putname(%p) name_count=%d" | |
1355 | " put_count=%d\n", | |
1356 | __FILE__, __LINE__, | |
1357 | context->serial, context->major, | |
1358 | context->in_syscall, name, context->name_count, | |
1359 | context->put_count); | |
1360 | dump_stack(); | |
1361 | } | |
1362 | } | |
1363 | #endif | |
1364 | } | |
1365 | ||
5712e88f AG |
1366 | static int audit_inc_name_count(struct audit_context *context, |
1367 | const struct inode *inode) | |
1368 | { | |
1369 | if (context->name_count >= AUDIT_NAMES) { | |
1370 | if (inode) | |
1371 | printk(KERN_DEBUG "name_count maxed, losing inode data: " | |
1372 | "dev=%02x:%02x, inode=%lu", | |
1373 | MAJOR(inode->i_sb->s_dev), | |
1374 | MINOR(inode->i_sb->s_dev), | |
1375 | inode->i_ino); | |
1376 | ||
1377 | else | |
1378 | printk(KERN_DEBUG "name_count maxed, losing inode data"); | |
1379 | return 1; | |
1380 | } | |
1381 | context->name_count++; | |
1382 | #if AUDIT_DEBUG | |
1383 | context->ino_count++; | |
1384 | #endif | |
1385 | return 0; | |
1386 | } | |
1387 | ||
3e2efce0 AG |
1388 | /* Copy inode data into an audit_names. */ |
1389 | static void audit_copy_inode(struct audit_names *name, const struct inode *inode) | |
8c8570fb | 1390 | { |
3e2efce0 AG |
1391 | name->ino = inode->i_ino; |
1392 | name->dev = inode->i_sb->s_dev; | |
1393 | name->mode = inode->i_mode; | |
1394 | name->uid = inode->i_uid; | |
1395 | name->gid = inode->i_gid; | |
1396 | name->rdev = inode->i_rdev; | |
1397 | selinux_get_inode_sid(inode, &name->osid); | |
8c8570fb DK |
1398 | } |
1399 | ||
b0dd25a8 RD |
1400 | /** |
1401 | * audit_inode - store the inode and device from a lookup | |
1402 | * @name: name being audited | |
1403 | * @inode: inode being audited | |
b0dd25a8 RD |
1404 | * |
1405 | * Called from fs/namei.c:path_lookup(). | |
1406 | */ | |
9c937dcc | 1407 | void __audit_inode(const char *name, const struct inode *inode) |
1da177e4 LT |
1408 | { |
1409 | int idx; | |
1410 | struct audit_context *context = current->audit_context; | |
1411 | ||
1412 | if (!context->in_syscall) | |
1413 | return; | |
1414 | if (context->name_count | |
1415 | && context->names[context->name_count-1].name | |
1416 | && context->names[context->name_count-1].name == name) | |
1417 | idx = context->name_count - 1; | |
1418 | else if (context->name_count > 1 | |
1419 | && context->names[context->name_count-2].name | |
1420 | && context->names[context->name_count-2].name == name) | |
1421 | idx = context->name_count - 2; | |
1422 | else { | |
1423 | /* FIXME: how much do we care about inodes that have no | |
1424 | * associated name? */ | |
5712e88f | 1425 | if (audit_inc_name_count(context, inode)) |
1da177e4 | 1426 | return; |
5712e88f | 1427 | idx = context->name_count - 1; |
1da177e4 | 1428 | context->names[idx].name = NULL; |
1da177e4 | 1429 | } |
3e2efce0 | 1430 | audit_copy_inode(&context->names[idx], inode); |
73241ccc AG |
1431 | } |
1432 | ||
1433 | /** | |
1434 | * audit_inode_child - collect inode info for created/removed objects | |
1435 | * @dname: inode's dentry name | |
1436 | * @inode: inode being audited | |
73d3ec5a | 1437 | * @parent: inode of dentry parent |
73241ccc AG |
1438 | * |
1439 | * For syscalls that create or remove filesystem objects, audit_inode | |
1440 | * can only collect information for the filesystem object's parent. | |
1441 | * This call updates the audit context with the child's information. | |
1442 | * Syscalls that create a new filesystem object must be hooked after | |
1443 | * the object is created. Syscalls that remove a filesystem object | |
1444 | * must be hooked prior, in order to capture the target inode during | |
1445 | * unsuccessful attempts. | |
1446 | */ | |
1447 | void __audit_inode_child(const char *dname, const struct inode *inode, | |
73d3ec5a | 1448 | const struct inode *parent) |
73241ccc AG |
1449 | { |
1450 | int idx; | |
1451 | struct audit_context *context = current->audit_context; | |
5712e88f | 1452 | const char *found_parent = NULL, *found_child = NULL; |
9c937dcc | 1453 | int dirlen = 0; |
73241ccc AG |
1454 | |
1455 | if (!context->in_syscall) | |
1456 | return; | |
1457 | ||
1458 | /* determine matching parent */ | |
f368c07d | 1459 | if (!dname) |
5712e88f | 1460 | goto add_names; |
73241ccc | 1461 | |
5712e88f AG |
1462 | /* parent is more likely, look for it first */ |
1463 | for (idx = 0; idx < context->name_count; idx++) { | |
1464 | struct audit_names *n = &context->names[idx]; | |
f368c07d | 1465 | |
5712e88f AG |
1466 | if (!n->name) |
1467 | continue; | |
1468 | ||
1469 | if (n->ino == parent->i_ino && | |
1470 | !audit_compare_dname_path(dname, n->name, &dirlen)) { | |
1471 | n->name_len = dirlen; /* update parent data in place */ | |
1472 | found_parent = n->name; | |
1473 | goto add_names; | |
f368c07d | 1474 | } |
5712e88f | 1475 | } |
73241ccc | 1476 | |
5712e88f AG |
1477 | /* no matching parent, look for matching child */ |
1478 | for (idx = 0; idx < context->name_count; idx++) { | |
1479 | struct audit_names *n = &context->names[idx]; | |
1480 | ||
1481 | if (!n->name) | |
1482 | continue; | |
1483 | ||
1484 | /* strcmp() is the more likely scenario */ | |
1485 | if (!strcmp(dname, n->name) || | |
1486 | !audit_compare_dname_path(dname, n->name, &dirlen)) { | |
1487 | if (inode) | |
1488 | audit_copy_inode(n, inode); | |
1489 | else | |
1490 | n->ino = (unsigned long)-1; | |
1491 | found_child = n->name; | |
1492 | goto add_names; | |
1493 | } | |
ac9910ce | 1494 | } |
5712e88f AG |
1495 | |
1496 | add_names: | |
1497 | if (!found_parent) { | |
1498 | if (audit_inc_name_count(context, parent)) | |
ac9910ce | 1499 | return; |
5712e88f AG |
1500 | idx = context->name_count - 1; |
1501 | context->names[idx].name = NULL; | |
73d3ec5a AG |
1502 | audit_copy_inode(&context->names[idx], parent); |
1503 | } | |
5712e88f AG |
1504 | |
1505 | if (!found_child) { | |
1506 | if (audit_inc_name_count(context, inode)) | |
1507 | return; | |
1508 | idx = context->name_count - 1; | |
1509 | ||
1510 | /* Re-use the name belonging to the slot for a matching parent | |
1511 | * directory. All names for this context are relinquished in | |
1512 | * audit_free_names() */ | |
1513 | if (found_parent) { | |
1514 | context->names[idx].name = found_parent; | |
1515 | context->names[idx].name_len = AUDIT_NAME_FULL; | |
1516 | /* don't call __putname() */ | |
1517 | context->names[idx].name_put = 0; | |
1518 | } else { | |
1519 | context->names[idx].name = NULL; | |
1520 | } | |
1521 | ||
1522 | if (inode) | |
1523 | audit_copy_inode(&context->names[idx], inode); | |
1524 | else | |
1525 | context->names[idx].ino = (unsigned long)-1; | |
1526 | } | |
3e2efce0 AG |
1527 | } |
1528 | ||
b0dd25a8 RD |
1529 | /** |
1530 | * auditsc_get_stamp - get local copies of audit_context values | |
1531 | * @ctx: audit_context for the task | |
1532 | * @t: timespec to store time recorded in the audit_context | |
1533 | * @serial: serial value that is recorded in the audit_context | |
1534 | * | |
1535 | * Also sets the context as auditable. | |
1536 | */ | |
bfb4496e DW |
1537 | void auditsc_get_stamp(struct audit_context *ctx, |
1538 | struct timespec *t, unsigned int *serial) | |
1da177e4 | 1539 | { |
ce625a80 DW |
1540 | if (!ctx->serial) |
1541 | ctx->serial = audit_serial(); | |
bfb4496e DW |
1542 | t->tv_sec = ctx->ctime.tv_sec; |
1543 | t->tv_nsec = ctx->ctime.tv_nsec; | |
1544 | *serial = ctx->serial; | |
1545 | ctx->auditable = 1; | |
1da177e4 LT |
1546 | } |
1547 | ||
b0dd25a8 RD |
1548 | /** |
1549 | * audit_set_loginuid - set a task's audit_context loginuid | |
1550 | * @task: task whose audit context is being modified | |
1551 | * @loginuid: loginuid value | |
1552 | * | |
1553 | * Returns 0. | |
1554 | * | |
1555 | * Called (set) from fs/proc/base.c::proc_loginuid_write(). | |
1556 | */ | |
456be6cd | 1557 | int audit_set_loginuid(struct task_struct *task, uid_t loginuid) |
1da177e4 | 1558 | { |
41757106 SG |
1559 | struct audit_context *context = task->audit_context; |
1560 | ||
1561 | if (context) { | |
1562 | /* Only log if audit is enabled */ | |
1563 | if (context->in_syscall) { | |
1564 | struct audit_buffer *ab; | |
1565 | ||
1566 | ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_LOGIN); | |
1567 | if (ab) { | |
1568 | audit_log_format(ab, "login pid=%d uid=%u " | |
1569 | "old auid=%u new auid=%u", | |
1570 | task->pid, task->uid, | |
1571 | context->loginuid, loginuid); | |
1572 | audit_log_end(ab); | |
1573 | } | |
c0404993 | 1574 | } |
41757106 | 1575 | context->loginuid = loginuid; |
1da177e4 LT |
1576 | } |
1577 | return 0; | |
1578 | } | |
1579 | ||
b0dd25a8 RD |
1580 | /** |
1581 | * audit_get_loginuid - get the loginuid for an audit_context | |
1582 | * @ctx: the audit_context | |
1583 | * | |
1584 | * Returns the context's loginuid or -1 if @ctx is NULL. | |
1585 | */ | |
1da177e4 LT |
1586 | uid_t audit_get_loginuid(struct audit_context *ctx) |
1587 | { | |
1588 | return ctx ? ctx->loginuid : -1; | |
1589 | } | |
1590 | ||
161a09e7 JL |
1591 | EXPORT_SYMBOL(audit_get_loginuid); |
1592 | ||
20ca73bc GW |
1593 | /** |
1594 | * __audit_mq_open - record audit data for a POSIX MQ open | |
1595 | * @oflag: open flag | |
1596 | * @mode: mode bits | |
1597 | * @u_attr: queue attributes | |
1598 | * | |
1599 | * Returns 0 for success or NULL context or < 0 on error. | |
1600 | */ | |
1601 | int __audit_mq_open(int oflag, mode_t mode, struct mq_attr __user *u_attr) | |
1602 | { | |
1603 | struct audit_aux_data_mq_open *ax; | |
1604 | struct audit_context *context = current->audit_context; | |
1605 | ||
1606 | if (!audit_enabled) | |
1607 | return 0; | |
1608 | ||
1609 | if (likely(!context)) | |
1610 | return 0; | |
1611 | ||
1612 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1613 | if (!ax) | |
1614 | return -ENOMEM; | |
1615 | ||
1616 | if (u_attr != NULL) { | |
1617 | if (copy_from_user(&ax->attr, u_attr, sizeof(ax->attr))) { | |
1618 | kfree(ax); | |
1619 | return -EFAULT; | |
1620 | } | |
1621 | } else | |
1622 | memset(&ax->attr, 0, sizeof(ax->attr)); | |
1623 | ||
1624 | ax->oflag = oflag; | |
1625 | ax->mode = mode; | |
1626 | ||
1627 | ax->d.type = AUDIT_MQ_OPEN; | |
1628 | ax->d.next = context->aux; | |
1629 | context->aux = (void *)ax; | |
1630 | return 0; | |
1631 | } | |
1632 | ||
1633 | /** | |
1634 | * __audit_mq_timedsend - record audit data for a POSIX MQ timed send | |
1635 | * @mqdes: MQ descriptor | |
1636 | * @msg_len: Message length | |
1637 | * @msg_prio: Message priority | |
1dbe83c3 | 1638 | * @u_abs_timeout: Message timeout in absolute time |
20ca73bc GW |
1639 | * |
1640 | * Returns 0 for success or NULL context or < 0 on error. | |
1641 | */ | |
1642 | int __audit_mq_timedsend(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, | |
1643 | const struct timespec __user *u_abs_timeout) | |
1644 | { | |
1645 | struct audit_aux_data_mq_sendrecv *ax; | |
1646 | struct audit_context *context = current->audit_context; | |
1647 | ||
1648 | if (!audit_enabled) | |
1649 | return 0; | |
1650 | ||
1651 | if (likely(!context)) | |
1652 | return 0; | |
1653 | ||
1654 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1655 | if (!ax) | |
1656 | return -ENOMEM; | |
1657 | ||
1658 | if (u_abs_timeout != NULL) { | |
1659 | if (copy_from_user(&ax->abs_timeout, u_abs_timeout, sizeof(ax->abs_timeout))) { | |
1660 | kfree(ax); | |
1661 | return -EFAULT; | |
1662 | } | |
1663 | } else | |
1664 | memset(&ax->abs_timeout, 0, sizeof(ax->abs_timeout)); | |
1665 | ||
1666 | ax->mqdes = mqdes; | |
1667 | ax->msg_len = msg_len; | |
1668 | ax->msg_prio = msg_prio; | |
1669 | ||
1670 | ax->d.type = AUDIT_MQ_SENDRECV; | |
1671 | ax->d.next = context->aux; | |
1672 | context->aux = (void *)ax; | |
1673 | return 0; | |
1674 | } | |
1675 | ||
1676 | /** | |
1677 | * __audit_mq_timedreceive - record audit data for a POSIX MQ timed receive | |
1678 | * @mqdes: MQ descriptor | |
1679 | * @msg_len: Message length | |
1dbe83c3 RD |
1680 | * @u_msg_prio: Message priority |
1681 | * @u_abs_timeout: Message timeout in absolute time | |
20ca73bc GW |
1682 | * |
1683 | * Returns 0 for success or NULL context or < 0 on error. | |
1684 | */ | |
1685 | int __audit_mq_timedreceive(mqd_t mqdes, size_t msg_len, | |
1686 | unsigned int __user *u_msg_prio, | |
1687 | const struct timespec __user *u_abs_timeout) | |
1688 | { | |
1689 | struct audit_aux_data_mq_sendrecv *ax; | |
1690 | struct audit_context *context = current->audit_context; | |
1691 | ||
1692 | if (!audit_enabled) | |
1693 | return 0; | |
1694 | ||
1695 | if (likely(!context)) | |
1696 | return 0; | |
1697 | ||
1698 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1699 | if (!ax) | |
1700 | return -ENOMEM; | |
1701 | ||
1702 | if (u_msg_prio != NULL) { | |
1703 | if (get_user(ax->msg_prio, u_msg_prio)) { | |
1704 | kfree(ax); | |
1705 | return -EFAULT; | |
1706 | } | |
1707 | } else | |
1708 | ax->msg_prio = 0; | |
1709 | ||
1710 | if (u_abs_timeout != NULL) { | |
1711 | if (copy_from_user(&ax->abs_timeout, u_abs_timeout, sizeof(ax->abs_timeout))) { | |
1712 | kfree(ax); | |
1713 | return -EFAULT; | |
1714 | } | |
1715 | } else | |
1716 | memset(&ax->abs_timeout, 0, sizeof(ax->abs_timeout)); | |
1717 | ||
1718 | ax->mqdes = mqdes; | |
1719 | ax->msg_len = msg_len; | |
1720 | ||
1721 | ax->d.type = AUDIT_MQ_SENDRECV; | |
1722 | ax->d.next = context->aux; | |
1723 | context->aux = (void *)ax; | |
1724 | return 0; | |
1725 | } | |
1726 | ||
1727 | /** | |
1728 | * __audit_mq_notify - record audit data for a POSIX MQ notify | |
1729 | * @mqdes: MQ descriptor | |
1730 | * @u_notification: Notification event | |
1731 | * | |
1732 | * Returns 0 for success or NULL context or < 0 on error. | |
1733 | */ | |
1734 | ||
1735 | int __audit_mq_notify(mqd_t mqdes, const struct sigevent __user *u_notification) | |
1736 | { | |
1737 | struct audit_aux_data_mq_notify *ax; | |
1738 | struct audit_context *context = current->audit_context; | |
1739 | ||
1740 | if (!audit_enabled) | |
1741 | return 0; | |
1742 | ||
1743 | if (likely(!context)) | |
1744 | return 0; | |
1745 | ||
1746 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1747 | if (!ax) | |
1748 | return -ENOMEM; | |
1749 | ||
1750 | if (u_notification != NULL) { | |
1751 | if (copy_from_user(&ax->notification, u_notification, sizeof(ax->notification))) { | |
1752 | kfree(ax); | |
1753 | return -EFAULT; | |
1754 | } | |
1755 | } else | |
1756 | memset(&ax->notification, 0, sizeof(ax->notification)); | |
1757 | ||
1758 | ax->mqdes = mqdes; | |
1759 | ||
1760 | ax->d.type = AUDIT_MQ_NOTIFY; | |
1761 | ax->d.next = context->aux; | |
1762 | context->aux = (void *)ax; | |
1763 | return 0; | |
1764 | } | |
1765 | ||
1766 | /** | |
1767 | * __audit_mq_getsetattr - record audit data for a POSIX MQ get/set attribute | |
1768 | * @mqdes: MQ descriptor | |
1769 | * @mqstat: MQ flags | |
1770 | * | |
1771 | * Returns 0 for success or NULL context or < 0 on error. | |
1772 | */ | |
1773 | int __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat) | |
1774 | { | |
1775 | struct audit_aux_data_mq_getsetattr *ax; | |
1776 | struct audit_context *context = current->audit_context; | |
1777 | ||
1778 | if (!audit_enabled) | |
1779 | return 0; | |
1780 | ||
1781 | if (likely(!context)) | |
1782 | return 0; | |
1783 | ||
1784 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1785 | if (!ax) | |
1786 | return -ENOMEM; | |
1787 | ||
1788 | ax->mqdes = mqdes; | |
1789 | ax->mqstat = *mqstat; | |
1790 | ||
1791 | ax->d.type = AUDIT_MQ_GETSETATTR; | |
1792 | ax->d.next = context->aux; | |
1793 | context->aux = (void *)ax; | |
1794 | return 0; | |
1795 | } | |
1796 | ||
b0dd25a8 | 1797 | /** |
073115d6 SG |
1798 | * audit_ipc_obj - record audit data for ipc object |
1799 | * @ipcp: ipc permissions | |
1800 | * | |
1801 | * Returns 0 for success or NULL context or < 0 on error. | |
1802 | */ | |
d8945bb5 | 1803 | int __audit_ipc_obj(struct kern_ipc_perm *ipcp) |
073115d6 SG |
1804 | { |
1805 | struct audit_aux_data_ipcctl *ax; | |
1806 | struct audit_context *context = current->audit_context; | |
1807 | ||
073115d6 SG |
1808 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); |
1809 | if (!ax) | |
1810 | return -ENOMEM; | |
1811 | ||
1812 | ax->uid = ipcp->uid; | |
1813 | ax->gid = ipcp->gid; | |
1814 | ax->mode = ipcp->mode; | |
1815 | selinux_get_ipc_sid(ipcp, &ax->osid); | |
1816 | ||
1817 | ax->d.type = AUDIT_IPC; | |
1818 | ax->d.next = context->aux; | |
1819 | context->aux = (void *)ax; | |
1820 | return 0; | |
1821 | } | |
1822 | ||
1823 | /** | |
1824 | * audit_ipc_set_perm - record audit data for new ipc permissions | |
b0dd25a8 RD |
1825 | * @qbytes: msgq bytes |
1826 | * @uid: msgq user id | |
1827 | * @gid: msgq group id | |
1828 | * @mode: msgq mode (permissions) | |
1829 | * | |
1830 | * Returns 0 for success or NULL context or < 0 on error. | |
1831 | */ | |
d8945bb5 | 1832 | int __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode) |
1da177e4 LT |
1833 | { |
1834 | struct audit_aux_data_ipcctl *ax; | |
1835 | struct audit_context *context = current->audit_context; | |
1836 | ||
8c8570fb | 1837 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); |
1da177e4 LT |
1838 | if (!ax) |
1839 | return -ENOMEM; | |
1840 | ||
1841 | ax->qbytes = qbytes; | |
1842 | ax->uid = uid; | |
1843 | ax->gid = gid; | |
1844 | ax->mode = mode; | |
1845 | ||
073115d6 | 1846 | ax->d.type = AUDIT_IPC_SET_PERM; |
1da177e4 LT |
1847 | ax->d.next = context->aux; |
1848 | context->aux = (void *)ax; | |
1849 | return 0; | |
1850 | } | |
c2f0c7c3 | 1851 | |
bdf4c48a PZ |
1852 | int audit_argv_kb = 32; |
1853 | ||
473ae30b AV |
1854 | int audit_bprm(struct linux_binprm *bprm) |
1855 | { | |
1856 | struct audit_aux_data_execve *ax; | |
1857 | struct audit_context *context = current->audit_context; | |
473ae30b | 1858 | |
5ac3a9c2 | 1859 | if (likely(!audit_enabled || !context || context->dummy)) |
473ae30b AV |
1860 | return 0; |
1861 | ||
bdf4c48a PZ |
1862 | /* |
1863 | * Even though the stack code doesn't limit the arg+env size any more, | |
1864 | * the audit code requires that _all_ arguments be logged in a single | |
1865 | * netlink skb. Hence cap it :-( | |
1866 | */ | |
1867 | if (bprm->argv_len > (audit_argv_kb << 10)) | |
1868 | return -E2BIG; | |
1869 | ||
1870 | ax = kmalloc(sizeof(*ax), GFP_KERNEL); | |
473ae30b AV |
1871 | if (!ax) |
1872 | return -ENOMEM; | |
1873 | ||
1874 | ax->argc = bprm->argc; | |
1875 | ax->envc = bprm->envc; | |
bdf4c48a | 1876 | ax->mm = bprm->mm; |
473ae30b AV |
1877 | ax->d.type = AUDIT_EXECVE; |
1878 | ax->d.next = context->aux; | |
1879 | context->aux = (void *)ax; | |
1880 | return 0; | |
1881 | } | |
1882 | ||
1883 | ||
b0dd25a8 RD |
1884 | /** |
1885 | * audit_socketcall - record audit data for sys_socketcall | |
1886 | * @nargs: number of args | |
1887 | * @args: args array | |
1888 | * | |
1889 | * Returns 0 for success or NULL context or < 0 on error. | |
1890 | */ | |
3ec3b2fb DW |
1891 | int audit_socketcall(int nargs, unsigned long *args) |
1892 | { | |
1893 | struct audit_aux_data_socketcall *ax; | |
1894 | struct audit_context *context = current->audit_context; | |
1895 | ||
5ac3a9c2 | 1896 | if (likely(!context || context->dummy)) |
3ec3b2fb DW |
1897 | return 0; |
1898 | ||
1899 | ax = kmalloc(sizeof(*ax) + nargs * sizeof(unsigned long), GFP_KERNEL); | |
1900 | if (!ax) | |
1901 | return -ENOMEM; | |
1902 | ||
1903 | ax->nargs = nargs; | |
1904 | memcpy(ax->args, args, nargs * sizeof(unsigned long)); | |
1905 | ||
1906 | ax->d.type = AUDIT_SOCKETCALL; | |
1907 | ax->d.next = context->aux; | |
1908 | context->aux = (void *)ax; | |
1909 | return 0; | |
1910 | } | |
1911 | ||
db349509 AV |
1912 | /** |
1913 | * __audit_fd_pair - record audit data for pipe and socketpair | |
1914 | * @fd1: the first file descriptor | |
1915 | * @fd2: the second file descriptor | |
1916 | * | |
1917 | * Returns 0 for success or NULL context or < 0 on error. | |
1918 | */ | |
1919 | int __audit_fd_pair(int fd1, int fd2) | |
1920 | { | |
1921 | struct audit_context *context = current->audit_context; | |
1922 | struct audit_aux_data_fd_pair *ax; | |
1923 | ||
1924 | if (likely(!context)) { | |
1925 | return 0; | |
1926 | } | |
1927 | ||
1928 | ax = kmalloc(sizeof(*ax), GFP_KERNEL); | |
1929 | if (!ax) { | |
1930 | return -ENOMEM; | |
1931 | } | |
1932 | ||
1933 | ax->fd[0] = fd1; | |
1934 | ax->fd[1] = fd2; | |
1935 | ||
1936 | ax->d.type = AUDIT_FD_PAIR; | |
1937 | ax->d.next = context->aux; | |
1938 | context->aux = (void *)ax; | |
1939 | return 0; | |
1940 | } | |
1941 | ||
b0dd25a8 RD |
1942 | /** |
1943 | * audit_sockaddr - record audit data for sys_bind, sys_connect, sys_sendto | |
1944 | * @len: data length in user space | |
1945 | * @a: data address in kernel space | |
1946 | * | |
1947 | * Returns 0 for success or NULL context or < 0 on error. | |
1948 | */ | |
3ec3b2fb DW |
1949 | int audit_sockaddr(int len, void *a) |
1950 | { | |
1951 | struct audit_aux_data_sockaddr *ax; | |
1952 | struct audit_context *context = current->audit_context; | |
1953 | ||
5ac3a9c2 | 1954 | if (likely(!context || context->dummy)) |
3ec3b2fb DW |
1955 | return 0; |
1956 | ||
1957 | ax = kmalloc(sizeof(*ax) + len, GFP_KERNEL); | |
1958 | if (!ax) | |
1959 | return -ENOMEM; | |
1960 | ||
1961 | ax->len = len; | |
1962 | memcpy(ax->a, a, len); | |
1963 | ||
1964 | ax->d.type = AUDIT_SOCKADDR; | |
1965 | ax->d.next = context->aux; | |
1966 | context->aux = (void *)ax; | |
1967 | return 0; | |
1968 | } | |
1969 | ||
a5cb013d AV |
1970 | void __audit_ptrace(struct task_struct *t) |
1971 | { | |
1972 | struct audit_context *context = current->audit_context; | |
1973 | ||
1974 | context->target_pid = t->pid; | |
1975 | selinux_get_task_sid(t, &context->target_sid); | |
1976 | } | |
1977 | ||
b0dd25a8 RD |
1978 | /** |
1979 | * audit_signal_info - record signal info for shutting down audit subsystem | |
1980 | * @sig: signal value | |
1981 | * @t: task being signaled | |
1982 | * | |
1983 | * If the audit subsystem is being terminated, record the task (pid) | |
1984 | * and uid that is doing that. | |
1985 | */ | |
e54dc243 | 1986 | int __audit_signal_info(int sig, struct task_struct *t) |
c2f0c7c3 | 1987 | { |
e54dc243 AG |
1988 | struct audit_aux_data_pids *axp; |
1989 | struct task_struct *tsk = current; | |
1990 | struct audit_context *ctx = tsk->audit_context; | |
c2f0c7c3 SG |
1991 | extern pid_t audit_sig_pid; |
1992 | extern uid_t audit_sig_uid; | |
e1396065 AV |
1993 | extern u32 audit_sig_sid; |
1994 | ||
175fc484 AV |
1995 | if (audit_pid && t->tgid == audit_pid) { |
1996 | if (sig == SIGTERM || sig == SIGHUP || sig == SIGUSR1) { | |
1997 | audit_sig_pid = tsk->pid; | |
1998 | if (ctx) | |
1999 | audit_sig_uid = ctx->loginuid; | |
2000 | else | |
2001 | audit_sig_uid = tsk->uid; | |
2002 | selinux_get_task_sid(tsk, &audit_sig_sid); | |
2003 | } | |
2004 | if (!audit_signals || audit_dummy_context()) | |
2005 | return 0; | |
c2f0c7c3 | 2006 | } |
e54dc243 | 2007 | |
e54dc243 AG |
2008 | /* optimize the common case by putting first signal recipient directly |
2009 | * in audit_context */ | |
2010 | if (!ctx->target_pid) { | |
2011 | ctx->target_pid = t->tgid; | |
2012 | selinux_get_task_sid(t, &ctx->target_sid); | |
2013 | return 0; | |
2014 | } | |
2015 | ||
2016 | axp = (void *)ctx->aux_pids; | |
2017 | if (!axp || axp->pid_count == AUDIT_AUX_PIDS) { | |
2018 | axp = kzalloc(sizeof(*axp), GFP_ATOMIC); | |
2019 | if (!axp) | |
2020 | return -ENOMEM; | |
2021 | ||
2022 | axp->d.type = AUDIT_OBJ_PID; | |
2023 | axp->d.next = ctx->aux_pids; | |
2024 | ctx->aux_pids = (void *)axp; | |
2025 | } | |
88ae704c | 2026 | BUG_ON(axp->pid_count >= AUDIT_AUX_PIDS); |
e54dc243 AG |
2027 | |
2028 | axp->target_pid[axp->pid_count] = t->tgid; | |
2029 | selinux_get_task_sid(t, &axp->target_sid[axp->pid_count]); | |
2030 | axp->pid_count++; | |
2031 | ||
2032 | return 0; | |
c2f0c7c3 | 2033 | } |
0a4ff8c2 SG |
2034 | |
2035 | /** | |
2036 | * audit_core_dumps - record information about processes that end abnormally | |
6d9525b5 | 2037 | * @signr: signal value |
0a4ff8c2 SG |
2038 | * |
2039 | * If a process ends with a core dump, something fishy is going on and we | |
2040 | * should record the event for investigation. | |
2041 | */ | |
2042 | void audit_core_dumps(long signr) | |
2043 | { | |
2044 | struct audit_buffer *ab; | |
2045 | u32 sid; | |
2046 | ||
2047 | if (!audit_enabled) | |
2048 | return; | |
2049 | ||
2050 | if (signr == SIGQUIT) /* don't care for those */ | |
2051 | return; | |
2052 | ||
2053 | ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_ANOM_ABEND); | |
2054 | audit_log_format(ab, "auid=%u uid=%u gid=%u", | |
2055 | audit_get_loginuid(current->audit_context), | |
2056 | current->uid, current->gid); | |
2057 | selinux_get_task_sid(current, &sid); | |
2058 | if (sid) { | |
2059 | char *ctx = NULL; | |
2060 | u32 len; | |
2061 | ||
2062 | if (selinux_sid_to_string(sid, &ctx, &len)) | |
2063 | audit_log_format(ab, " ssid=%u", sid); | |
2064 | else | |
2065 | audit_log_format(ab, " subj=%s", ctx); | |
2066 | kfree(ctx); | |
2067 | } | |
2068 | audit_log_format(ab, " pid=%d comm=", current->pid); | |
2069 | audit_log_untrustedstring(ab, current->comm); | |
2070 | audit_log_format(ab, " sig=%ld", signr); | |
2071 | audit_log_end(ab); | |
2072 | } |