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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 <linux/fs.h> |
49 | #include <linux/namei.h> | |
1da177e4 LT |
50 | #include <linux/mm.h> |
51 | #include <linux/module.h> | |
01116105 | 52 | #include <linux/mount.h> |
3ec3b2fb | 53 | #include <linux/socket.h> |
20ca73bc | 54 | #include <linux/mqueue.h> |
1da177e4 LT |
55 | #include <linux/audit.h> |
56 | #include <linux/personality.h> | |
57 | #include <linux/time.h> | |
5bb289b5 | 58 | #include <linux/netlink.h> |
f5561964 | 59 | #include <linux/compiler.h> |
1da177e4 | 60 | #include <asm/unistd.h> |
8c8570fb | 61 | #include <linux/security.h> |
fe7752ba | 62 | #include <linux/list.h> |
a6c043a8 | 63 | #include <linux/tty.h> |
3dc7e315 | 64 | #include <linux/selinux.h> |
473ae30b | 65 | #include <linux/binfmts.h> |
a1f8e7f7 | 66 | #include <linux/highmem.h> |
f46038ff | 67 | #include <linux/syscalls.h> |
1da177e4 | 68 | |
fe7752ba | 69 | #include "audit.h" |
1da177e4 | 70 | |
fe7752ba | 71 | extern struct list_head audit_filter_list[]; |
1da177e4 | 72 | |
1da177e4 LT |
73 | /* AUDIT_NAMES is the number of slots we reserve in the audit_context |
74 | * for saving names from getname(). */ | |
75 | #define AUDIT_NAMES 20 | |
76 | ||
9c937dcc AG |
77 | /* Indicates that audit should log the full pathname. */ |
78 | #define AUDIT_NAME_FULL -1 | |
79 | ||
471a5c7c AV |
80 | /* number of audit rules */ |
81 | int audit_n_rules; | |
82 | ||
e54dc243 AG |
83 | /* determines whether we collect data for signals sent */ |
84 | int audit_signals; | |
85 | ||
1da177e4 LT |
86 | /* When fs/namei.c:getname() is called, we store the pointer in name and |
87 | * we don't let putname() free it (instead we free all of the saved | |
88 | * pointers at syscall exit time). | |
89 | * | |
90 | * Further, in fs/namei.c:path_lookup() we store the inode and device. */ | |
91 | struct audit_names { | |
92 | const char *name; | |
9c937dcc AG |
93 | int name_len; /* number of name's characters to log */ |
94 | unsigned name_put; /* call __putname() for this name */ | |
1da177e4 LT |
95 | unsigned long ino; |
96 | dev_t dev; | |
97 | umode_t mode; | |
98 | uid_t uid; | |
99 | gid_t gid; | |
100 | dev_t rdev; | |
1b50eed9 | 101 | u32 osid; |
1da177e4 LT |
102 | }; |
103 | ||
104 | struct audit_aux_data { | |
105 | struct audit_aux_data *next; | |
106 | int type; | |
107 | }; | |
108 | ||
109 | #define AUDIT_AUX_IPCPERM 0 | |
110 | ||
e54dc243 AG |
111 | /* Number of target pids per aux struct. */ |
112 | #define AUDIT_AUX_PIDS 16 | |
113 | ||
20ca73bc GW |
114 | struct audit_aux_data_mq_open { |
115 | struct audit_aux_data d; | |
116 | int oflag; | |
117 | mode_t mode; | |
118 | struct mq_attr attr; | |
119 | }; | |
120 | ||
121 | struct audit_aux_data_mq_sendrecv { | |
122 | struct audit_aux_data d; | |
123 | mqd_t mqdes; | |
124 | size_t msg_len; | |
125 | unsigned int msg_prio; | |
126 | struct timespec abs_timeout; | |
127 | }; | |
128 | ||
129 | struct audit_aux_data_mq_notify { | |
130 | struct audit_aux_data d; | |
131 | mqd_t mqdes; | |
132 | struct sigevent notification; | |
133 | }; | |
134 | ||
135 | struct audit_aux_data_mq_getsetattr { | |
136 | struct audit_aux_data d; | |
137 | mqd_t mqdes; | |
138 | struct mq_attr mqstat; | |
139 | }; | |
140 | ||
1da177e4 LT |
141 | struct audit_aux_data_ipcctl { |
142 | struct audit_aux_data d; | |
143 | struct ipc_perm p; | |
144 | unsigned long qbytes; | |
145 | uid_t uid; | |
146 | gid_t gid; | |
147 | mode_t mode; | |
9c7aa6aa | 148 | u32 osid; |
1da177e4 LT |
149 | }; |
150 | ||
473ae30b AV |
151 | struct audit_aux_data_execve { |
152 | struct audit_aux_data d; | |
153 | int argc; | |
154 | int envc; | |
bdf4c48a | 155 | struct mm_struct *mm; |
473ae30b AV |
156 | }; |
157 | ||
3ec3b2fb DW |
158 | struct audit_aux_data_socketcall { |
159 | struct audit_aux_data d; | |
160 | int nargs; | |
161 | unsigned long args[0]; | |
162 | }; | |
163 | ||
164 | struct audit_aux_data_sockaddr { | |
165 | struct audit_aux_data d; | |
166 | int len; | |
167 | char a[0]; | |
168 | }; | |
169 | ||
db349509 AV |
170 | struct audit_aux_data_fd_pair { |
171 | struct audit_aux_data d; | |
172 | int fd[2]; | |
173 | }; | |
174 | ||
e54dc243 AG |
175 | struct audit_aux_data_pids { |
176 | struct audit_aux_data d; | |
177 | pid_t target_pid[AUDIT_AUX_PIDS]; | |
178 | u32 target_sid[AUDIT_AUX_PIDS]; | |
179 | int pid_count; | |
180 | }; | |
181 | ||
1da177e4 LT |
182 | /* The per-task audit context. */ |
183 | struct audit_context { | |
d51374ad | 184 | int dummy; /* must be the first element */ |
1da177e4 LT |
185 | int in_syscall; /* 1 if task is in a syscall */ |
186 | enum audit_state state; | |
187 | unsigned int serial; /* serial number for record */ | |
188 | struct timespec ctime; /* time of syscall entry */ | |
189 | uid_t loginuid; /* login uid (identity) */ | |
190 | int major; /* syscall number */ | |
191 | unsigned long argv[4]; /* syscall arguments */ | |
192 | int return_valid; /* return code is valid */ | |
2fd6f58b | 193 | long return_code;/* syscall return code */ |
1da177e4 LT |
194 | int auditable; /* 1 if record should be written */ |
195 | int name_count; | |
196 | struct audit_names names[AUDIT_NAMES]; | |
5adc8a6a | 197 | char * filterkey; /* key for rule that triggered record */ |
8f37d47c DW |
198 | struct dentry * pwd; |
199 | struct vfsmount * pwdmnt; | |
1da177e4 LT |
200 | struct audit_context *previous; /* For nested syscalls */ |
201 | struct audit_aux_data *aux; | |
e54dc243 | 202 | struct audit_aux_data *aux_pids; |
1da177e4 LT |
203 | |
204 | /* Save things to print about task_struct */ | |
f46038ff | 205 | pid_t pid, ppid; |
1da177e4 LT |
206 | uid_t uid, euid, suid, fsuid; |
207 | gid_t gid, egid, sgid, fsgid; | |
208 | unsigned long personality; | |
2fd6f58b | 209 | int arch; |
1da177e4 | 210 | |
a5cb013d AV |
211 | pid_t target_pid; |
212 | u32 target_sid; | |
213 | ||
1da177e4 LT |
214 | #if AUDIT_DEBUG |
215 | int put_count; | |
216 | int ino_count; | |
217 | #endif | |
218 | }; | |
219 | ||
55669bfa AV |
220 | #define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE]) |
221 | static inline int open_arg(int flags, int mask) | |
222 | { | |
223 | int n = ACC_MODE(flags); | |
224 | if (flags & (O_TRUNC | O_CREAT)) | |
225 | n |= AUDIT_PERM_WRITE; | |
226 | return n & mask; | |
227 | } | |
228 | ||
229 | static int audit_match_perm(struct audit_context *ctx, int mask) | |
230 | { | |
231 | unsigned n = ctx->major; | |
232 | switch (audit_classify_syscall(ctx->arch, n)) { | |
233 | case 0: /* native */ | |
234 | if ((mask & AUDIT_PERM_WRITE) && | |
235 | audit_match_class(AUDIT_CLASS_WRITE, n)) | |
236 | return 1; | |
237 | if ((mask & AUDIT_PERM_READ) && | |
238 | audit_match_class(AUDIT_CLASS_READ, n)) | |
239 | return 1; | |
240 | if ((mask & AUDIT_PERM_ATTR) && | |
241 | audit_match_class(AUDIT_CLASS_CHATTR, n)) | |
242 | return 1; | |
243 | return 0; | |
244 | case 1: /* 32bit on biarch */ | |
245 | if ((mask & AUDIT_PERM_WRITE) && | |
246 | audit_match_class(AUDIT_CLASS_WRITE_32, n)) | |
247 | return 1; | |
248 | if ((mask & AUDIT_PERM_READ) && | |
249 | audit_match_class(AUDIT_CLASS_READ_32, n)) | |
250 | return 1; | |
251 | if ((mask & AUDIT_PERM_ATTR) && | |
252 | audit_match_class(AUDIT_CLASS_CHATTR_32, n)) | |
253 | return 1; | |
254 | return 0; | |
255 | case 2: /* open */ | |
256 | return mask & ACC_MODE(ctx->argv[1]); | |
257 | case 3: /* openat */ | |
258 | return mask & ACC_MODE(ctx->argv[2]); | |
259 | case 4: /* socketcall */ | |
260 | return ((mask & AUDIT_PERM_WRITE) && ctx->argv[0] == SYS_BIND); | |
261 | case 5: /* execve */ | |
262 | return mask & AUDIT_PERM_EXEC; | |
263 | default: | |
264 | return 0; | |
265 | } | |
266 | } | |
267 | ||
f368c07d | 268 | /* Determine if any context name data matches a rule's watch data */ |
1da177e4 LT |
269 | /* Compare a task_struct with an audit_rule. Return 1 on match, 0 |
270 | * otherwise. */ | |
271 | static int audit_filter_rules(struct task_struct *tsk, | |
93315ed6 | 272 | struct audit_krule *rule, |
1da177e4 | 273 | struct audit_context *ctx, |
f368c07d | 274 | struct audit_names *name, |
1da177e4 LT |
275 | enum audit_state *state) |
276 | { | |
2ad312d2 | 277 | int i, j, need_sid = 1; |
3dc7e315 DG |
278 | u32 sid; |
279 | ||
1da177e4 | 280 | for (i = 0; i < rule->field_count; i++) { |
93315ed6 | 281 | struct audit_field *f = &rule->fields[i]; |
1da177e4 LT |
282 | int result = 0; |
283 | ||
93315ed6 | 284 | switch (f->type) { |
1da177e4 | 285 | case AUDIT_PID: |
93315ed6 | 286 | result = audit_comparator(tsk->pid, f->op, f->val); |
1da177e4 | 287 | break; |
3c66251e | 288 | case AUDIT_PPID: |
419c58f1 AV |
289 | if (ctx) { |
290 | if (!ctx->ppid) | |
291 | ctx->ppid = sys_getppid(); | |
3c66251e | 292 | result = audit_comparator(ctx->ppid, f->op, f->val); |
419c58f1 | 293 | } |
3c66251e | 294 | break; |
1da177e4 | 295 | case AUDIT_UID: |
93315ed6 | 296 | result = audit_comparator(tsk->uid, f->op, f->val); |
1da177e4 LT |
297 | break; |
298 | case AUDIT_EUID: | |
93315ed6 | 299 | result = audit_comparator(tsk->euid, f->op, f->val); |
1da177e4 LT |
300 | break; |
301 | case AUDIT_SUID: | |
93315ed6 | 302 | result = audit_comparator(tsk->suid, f->op, f->val); |
1da177e4 LT |
303 | break; |
304 | case AUDIT_FSUID: | |
93315ed6 | 305 | result = audit_comparator(tsk->fsuid, f->op, f->val); |
1da177e4 LT |
306 | break; |
307 | case AUDIT_GID: | |
93315ed6 | 308 | result = audit_comparator(tsk->gid, f->op, f->val); |
1da177e4 LT |
309 | break; |
310 | case AUDIT_EGID: | |
93315ed6 | 311 | result = audit_comparator(tsk->egid, f->op, f->val); |
1da177e4 LT |
312 | break; |
313 | case AUDIT_SGID: | |
93315ed6 | 314 | result = audit_comparator(tsk->sgid, f->op, f->val); |
1da177e4 LT |
315 | break; |
316 | case AUDIT_FSGID: | |
93315ed6 | 317 | result = audit_comparator(tsk->fsgid, f->op, f->val); |
1da177e4 LT |
318 | break; |
319 | case AUDIT_PERS: | |
93315ed6 | 320 | result = audit_comparator(tsk->personality, f->op, f->val); |
1da177e4 | 321 | break; |
2fd6f58b | 322 | case AUDIT_ARCH: |
b63862f4 | 323 | if (ctx) |
93315ed6 | 324 | result = audit_comparator(ctx->arch, f->op, f->val); |
2fd6f58b | 325 | break; |
1da177e4 LT |
326 | |
327 | case AUDIT_EXIT: | |
328 | if (ctx && ctx->return_valid) | |
93315ed6 | 329 | result = audit_comparator(ctx->return_code, f->op, f->val); |
1da177e4 LT |
330 | break; |
331 | case AUDIT_SUCCESS: | |
b01f2cc1 | 332 | if (ctx && ctx->return_valid) { |
93315ed6 AG |
333 | if (f->val) |
334 | result = audit_comparator(ctx->return_valid, f->op, AUDITSC_SUCCESS); | |
b01f2cc1 | 335 | else |
93315ed6 | 336 | result = audit_comparator(ctx->return_valid, f->op, AUDITSC_FAILURE); |
b01f2cc1 | 337 | } |
1da177e4 LT |
338 | break; |
339 | case AUDIT_DEVMAJOR: | |
f368c07d AG |
340 | if (name) |
341 | result = audit_comparator(MAJOR(name->dev), | |
342 | f->op, f->val); | |
343 | else if (ctx) { | |
1da177e4 | 344 | for (j = 0; j < ctx->name_count; j++) { |
93315ed6 | 345 | if (audit_comparator(MAJOR(ctx->names[j].dev), f->op, f->val)) { |
1da177e4 LT |
346 | ++result; |
347 | break; | |
348 | } | |
349 | } | |
350 | } | |
351 | break; | |
352 | case AUDIT_DEVMINOR: | |
f368c07d AG |
353 | if (name) |
354 | result = audit_comparator(MINOR(name->dev), | |
355 | f->op, f->val); | |
356 | else if (ctx) { | |
1da177e4 | 357 | for (j = 0; j < ctx->name_count; j++) { |
93315ed6 | 358 | if (audit_comparator(MINOR(ctx->names[j].dev), f->op, f->val)) { |
1da177e4 LT |
359 | ++result; |
360 | break; | |
361 | } | |
362 | } | |
363 | } | |
364 | break; | |
365 | case AUDIT_INODE: | |
f368c07d | 366 | if (name) |
9c937dcc | 367 | result = (name->ino == f->val); |
f368c07d | 368 | else if (ctx) { |
1da177e4 | 369 | for (j = 0; j < ctx->name_count; j++) { |
9c937dcc | 370 | if (audit_comparator(ctx->names[j].ino, f->op, f->val)) { |
1da177e4 LT |
371 | ++result; |
372 | break; | |
373 | } | |
374 | } | |
375 | } | |
376 | break; | |
f368c07d AG |
377 | case AUDIT_WATCH: |
378 | if (name && rule->watch->ino != (unsigned long)-1) | |
379 | result = (name->dev == rule->watch->dev && | |
9c937dcc | 380 | name->ino == rule->watch->ino); |
f368c07d | 381 | break; |
1da177e4 LT |
382 | case AUDIT_LOGINUID: |
383 | result = 0; | |
384 | if (ctx) | |
93315ed6 | 385 | result = audit_comparator(ctx->loginuid, f->op, f->val); |
1da177e4 | 386 | break; |
3a6b9f85 DG |
387 | case AUDIT_SUBJ_USER: |
388 | case AUDIT_SUBJ_ROLE: | |
389 | case AUDIT_SUBJ_TYPE: | |
390 | case AUDIT_SUBJ_SEN: | |
391 | case AUDIT_SUBJ_CLR: | |
3dc7e315 DG |
392 | /* NOTE: this may return negative values indicating |
393 | a temporary error. We simply treat this as a | |
394 | match for now to avoid losing information that | |
395 | may be wanted. An error message will also be | |
396 | logged upon error */ | |
2ad312d2 SG |
397 | if (f->se_rule) { |
398 | if (need_sid) { | |
62bac018 | 399 | selinux_get_task_sid(tsk, &sid); |
2ad312d2 SG |
400 | need_sid = 0; |
401 | } | |
3dc7e315 DG |
402 | result = selinux_audit_rule_match(sid, f->type, |
403 | f->op, | |
404 | f->se_rule, | |
405 | ctx); | |
2ad312d2 | 406 | } |
3dc7e315 | 407 | break; |
6e5a2d1d DG |
408 | case AUDIT_OBJ_USER: |
409 | case AUDIT_OBJ_ROLE: | |
410 | case AUDIT_OBJ_TYPE: | |
411 | case AUDIT_OBJ_LEV_LOW: | |
412 | case AUDIT_OBJ_LEV_HIGH: | |
413 | /* The above note for AUDIT_SUBJ_USER...AUDIT_SUBJ_CLR | |
414 | also applies here */ | |
415 | if (f->se_rule) { | |
416 | /* Find files that match */ | |
417 | if (name) { | |
418 | result = selinux_audit_rule_match( | |
419 | name->osid, f->type, f->op, | |
420 | f->se_rule, ctx); | |
421 | } else if (ctx) { | |
422 | for (j = 0; j < ctx->name_count; j++) { | |
423 | if (selinux_audit_rule_match( | |
424 | ctx->names[j].osid, | |
425 | f->type, f->op, | |
426 | f->se_rule, ctx)) { | |
427 | ++result; | |
428 | break; | |
429 | } | |
430 | } | |
431 | } | |
432 | /* Find ipc objects that match */ | |
433 | if (ctx) { | |
434 | struct audit_aux_data *aux; | |
435 | for (aux = ctx->aux; aux; | |
436 | aux = aux->next) { | |
437 | if (aux->type == AUDIT_IPC) { | |
438 | struct audit_aux_data_ipcctl *axi = (void *)aux; | |
439 | if (selinux_audit_rule_match(axi->osid, f->type, f->op, f->se_rule, ctx)) { | |
440 | ++result; | |
441 | break; | |
442 | } | |
443 | } | |
444 | } | |
445 | } | |
446 | } | |
447 | break; | |
1da177e4 LT |
448 | case AUDIT_ARG0: |
449 | case AUDIT_ARG1: | |
450 | case AUDIT_ARG2: | |
451 | case AUDIT_ARG3: | |
452 | if (ctx) | |
93315ed6 | 453 | result = audit_comparator(ctx->argv[f->type-AUDIT_ARG0], f->op, f->val); |
1da177e4 | 454 | break; |
5adc8a6a AG |
455 | case AUDIT_FILTERKEY: |
456 | /* ignore this field for filtering */ | |
457 | result = 1; | |
458 | break; | |
55669bfa AV |
459 | case AUDIT_PERM: |
460 | result = audit_match_perm(ctx, f->val); | |
461 | break; | |
1da177e4 LT |
462 | } |
463 | ||
1da177e4 LT |
464 | if (!result) |
465 | return 0; | |
466 | } | |
5adc8a6a AG |
467 | if (rule->filterkey) |
468 | ctx->filterkey = kstrdup(rule->filterkey, GFP_ATOMIC); | |
1da177e4 LT |
469 | switch (rule->action) { |
470 | case AUDIT_NEVER: *state = AUDIT_DISABLED; break; | |
1da177e4 LT |
471 | case AUDIT_ALWAYS: *state = AUDIT_RECORD_CONTEXT; break; |
472 | } | |
473 | return 1; | |
474 | } | |
475 | ||
476 | /* At process creation time, we can determine if system-call auditing is | |
477 | * completely disabled for this task. Since we only have the task | |
478 | * structure at this point, we can only check uid and gid. | |
479 | */ | |
480 | static enum audit_state audit_filter_task(struct task_struct *tsk) | |
481 | { | |
482 | struct audit_entry *e; | |
483 | enum audit_state state; | |
484 | ||
485 | rcu_read_lock(); | |
0f45aa18 | 486 | list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_TASK], list) { |
f368c07d | 487 | if (audit_filter_rules(tsk, &e->rule, NULL, NULL, &state)) { |
1da177e4 LT |
488 | rcu_read_unlock(); |
489 | return state; | |
490 | } | |
491 | } | |
492 | rcu_read_unlock(); | |
493 | return AUDIT_BUILD_CONTEXT; | |
494 | } | |
495 | ||
496 | /* At syscall entry and exit time, this filter is called if the | |
497 | * audit_state is not low enough that auditing cannot take place, but is | |
23f32d18 | 498 | * also not high enough that we already know we have to write an audit |
b0dd25a8 | 499 | * record (i.e., the state is AUDIT_SETUP_CONTEXT or AUDIT_BUILD_CONTEXT). |
1da177e4 LT |
500 | */ |
501 | static enum audit_state audit_filter_syscall(struct task_struct *tsk, | |
502 | struct audit_context *ctx, | |
503 | struct list_head *list) | |
504 | { | |
505 | struct audit_entry *e; | |
c3896495 | 506 | enum audit_state state; |
1da177e4 | 507 | |
351bb722 | 508 | if (audit_pid && tsk->tgid == audit_pid) |
f7056d64 DW |
509 | return AUDIT_DISABLED; |
510 | ||
1da177e4 | 511 | rcu_read_lock(); |
c3896495 | 512 | if (!list_empty(list)) { |
b63862f4 DK |
513 | int word = AUDIT_WORD(ctx->major); |
514 | int bit = AUDIT_BIT(ctx->major); | |
515 | ||
516 | list_for_each_entry_rcu(e, list, list) { | |
f368c07d AG |
517 | if ((e->rule.mask[word] & bit) == bit && |
518 | audit_filter_rules(tsk, &e->rule, ctx, NULL, | |
519 | &state)) { | |
520 | rcu_read_unlock(); | |
521 | return state; | |
522 | } | |
523 | } | |
524 | } | |
525 | rcu_read_unlock(); | |
526 | return AUDIT_BUILD_CONTEXT; | |
527 | } | |
528 | ||
529 | /* At syscall exit time, this filter is called if any audit_names[] have been | |
530 | * collected during syscall processing. We only check rules in sublists at hash | |
531 | * buckets applicable to the inode numbers in audit_names[]. | |
532 | * Regarding audit_state, same rules apply as for audit_filter_syscall(). | |
533 | */ | |
534 | enum audit_state audit_filter_inodes(struct task_struct *tsk, | |
535 | struct audit_context *ctx) | |
536 | { | |
537 | int i; | |
538 | struct audit_entry *e; | |
539 | enum audit_state state; | |
540 | ||
541 | if (audit_pid && tsk->tgid == audit_pid) | |
542 | return AUDIT_DISABLED; | |
543 | ||
544 | rcu_read_lock(); | |
545 | for (i = 0; i < ctx->name_count; i++) { | |
546 | int word = AUDIT_WORD(ctx->major); | |
547 | int bit = AUDIT_BIT(ctx->major); | |
548 | struct audit_names *n = &ctx->names[i]; | |
549 | int h = audit_hash_ino((u32)n->ino); | |
550 | struct list_head *list = &audit_inode_hash[h]; | |
551 | ||
552 | if (list_empty(list)) | |
553 | continue; | |
554 | ||
555 | list_for_each_entry_rcu(e, list, list) { | |
556 | if ((e->rule.mask[word] & bit) == bit && | |
557 | audit_filter_rules(tsk, &e->rule, ctx, n, &state)) { | |
b63862f4 DK |
558 | rcu_read_unlock(); |
559 | return state; | |
560 | } | |
0f45aa18 DW |
561 | } |
562 | } | |
563 | rcu_read_unlock(); | |
1da177e4 | 564 | return AUDIT_BUILD_CONTEXT; |
0f45aa18 DW |
565 | } |
566 | ||
f368c07d AG |
567 | void audit_set_auditable(struct audit_context *ctx) |
568 | { | |
569 | ctx->auditable = 1; | |
570 | } | |
571 | ||
1da177e4 LT |
572 | static inline struct audit_context *audit_get_context(struct task_struct *tsk, |
573 | int return_valid, | |
574 | int return_code) | |
575 | { | |
576 | struct audit_context *context = tsk->audit_context; | |
577 | ||
578 | if (likely(!context)) | |
579 | return NULL; | |
580 | context->return_valid = return_valid; | |
581 | context->return_code = return_code; | |
582 | ||
d51374ad | 583 | if (context->in_syscall && !context->dummy && !context->auditable) { |
1da177e4 | 584 | enum audit_state state; |
f368c07d | 585 | |
0f45aa18 | 586 | state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_EXIT]); |
f368c07d AG |
587 | if (state == AUDIT_RECORD_CONTEXT) { |
588 | context->auditable = 1; | |
589 | goto get_context; | |
590 | } | |
591 | ||
592 | state = audit_filter_inodes(tsk, context); | |
1da177e4 LT |
593 | if (state == AUDIT_RECORD_CONTEXT) |
594 | context->auditable = 1; | |
f368c07d | 595 | |
1da177e4 LT |
596 | } |
597 | ||
f368c07d | 598 | get_context: |
3f2792ff | 599 | |
1da177e4 LT |
600 | tsk->audit_context = NULL; |
601 | return context; | |
602 | } | |
603 | ||
604 | static inline void audit_free_names(struct audit_context *context) | |
605 | { | |
606 | int i; | |
607 | ||
608 | #if AUDIT_DEBUG == 2 | |
609 | if (context->auditable | |
610 | ||context->put_count + context->ino_count != context->name_count) { | |
73241ccc | 611 | printk(KERN_ERR "%s:%d(:%d): major=%d in_syscall=%d" |
1da177e4 LT |
612 | " name_count=%d put_count=%d" |
613 | " ino_count=%d [NOT freeing]\n", | |
73241ccc | 614 | __FILE__, __LINE__, |
1da177e4 LT |
615 | context->serial, context->major, context->in_syscall, |
616 | context->name_count, context->put_count, | |
617 | context->ino_count); | |
8c8570fb | 618 | for (i = 0; i < context->name_count; i++) { |
1da177e4 LT |
619 | printk(KERN_ERR "names[%d] = %p = %s\n", i, |
620 | context->names[i].name, | |
73241ccc | 621 | context->names[i].name ?: "(null)"); |
8c8570fb | 622 | } |
1da177e4 LT |
623 | dump_stack(); |
624 | return; | |
625 | } | |
626 | #endif | |
627 | #if AUDIT_DEBUG | |
628 | context->put_count = 0; | |
629 | context->ino_count = 0; | |
630 | #endif | |
631 | ||
8c8570fb | 632 | for (i = 0; i < context->name_count; i++) { |
9c937dcc | 633 | if (context->names[i].name && context->names[i].name_put) |
1da177e4 | 634 | __putname(context->names[i].name); |
8c8570fb | 635 | } |
1da177e4 | 636 | context->name_count = 0; |
8f37d47c DW |
637 | if (context->pwd) |
638 | dput(context->pwd); | |
639 | if (context->pwdmnt) | |
640 | mntput(context->pwdmnt); | |
641 | context->pwd = NULL; | |
642 | context->pwdmnt = NULL; | |
1da177e4 LT |
643 | } |
644 | ||
645 | static inline void audit_free_aux(struct audit_context *context) | |
646 | { | |
647 | struct audit_aux_data *aux; | |
648 | ||
649 | while ((aux = context->aux)) { | |
650 | context->aux = aux->next; | |
651 | kfree(aux); | |
652 | } | |
e54dc243 AG |
653 | while ((aux = context->aux_pids)) { |
654 | context->aux_pids = aux->next; | |
655 | kfree(aux); | |
656 | } | |
1da177e4 LT |
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 | ||
e54dc243 AG |
798 | static int audit_log_pid_context(struct audit_context *context, pid_t pid, |
799 | u32 sid) | |
800 | { | |
801 | struct audit_buffer *ab; | |
802 | char *s = NULL; | |
803 | u32 len; | |
804 | int rc = 0; | |
805 | ||
806 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID); | |
807 | if (!ab) | |
808 | return 1; | |
809 | ||
810 | if (selinux_sid_to_string(sid, &s, &len)) { | |
811 | audit_log_format(ab, "opid=%d obj=(none)", pid); | |
812 | rc = 1; | |
813 | } else | |
814 | audit_log_format(ab, "opid=%d obj=%s", pid, s); | |
815 | audit_log_end(ab); | |
816 | kfree(s); | |
817 | ||
818 | return rc; | |
819 | } | |
820 | ||
bdf4c48a PZ |
821 | static void audit_log_execve_info(struct audit_buffer *ab, |
822 | struct audit_aux_data_execve *axi) | |
823 | { | |
824 | int i; | |
825 | long len, ret; | |
040b3a2d | 826 | const char __user *p; |
bdf4c48a PZ |
827 | char *buf; |
828 | ||
829 | if (axi->mm != current->mm) | |
830 | return; /* execve failed, no additional info */ | |
831 | ||
040b3a2d PZ |
832 | p = (const char __user *)axi->mm->arg_start; |
833 | ||
bdf4c48a | 834 | for (i = 0; i < axi->argc; i++, p += len) { |
b6a2fea3 | 835 | len = strnlen_user(p, MAX_ARG_STRLEN); |
bdf4c48a PZ |
836 | /* |
837 | * We just created this mm, if we can't find the strings | |
838 | * we just copied into it something is _very_ wrong. Similar | |
839 | * for strings that are too long, we should not have created | |
840 | * any. | |
841 | */ | |
842 | if (!len || len > MAX_ARG_STRLEN) { | |
843 | WARN_ON(1); | |
844 | send_sig(SIGKILL, current, 0); | |
845 | } | |
846 | ||
847 | buf = kmalloc(len, GFP_KERNEL); | |
848 | if (!buf) { | |
849 | audit_panic("out of memory for argv string\n"); | |
850 | break; | |
851 | } | |
852 | ||
853 | ret = copy_from_user(buf, p, len); | |
854 | /* | |
855 | * There is no reason for this copy to be short. We just | |
856 | * copied them here, and the mm hasn't been exposed to user- | |
857 | * space yet. | |
858 | */ | |
040b3a2d | 859 | if (ret) { |
bdf4c48a PZ |
860 | WARN_ON(1); |
861 | send_sig(SIGKILL, current, 0); | |
862 | } | |
863 | ||
864 | audit_log_format(ab, "a%d=", i); | |
865 | audit_log_untrustedstring(ab, buf); | |
866 | audit_log_format(ab, "\n"); | |
867 | ||
868 | kfree(buf); | |
869 | } | |
870 | } | |
871 | ||
e495149b | 872 | static void audit_log_exit(struct audit_context *context, struct task_struct *tsk) |
1da177e4 | 873 | { |
9c7aa6aa | 874 | int i, call_panic = 0; |
1da177e4 | 875 | struct audit_buffer *ab; |
7551ced3 | 876 | struct audit_aux_data *aux; |
a6c043a8 | 877 | const char *tty; |
1da177e4 | 878 | |
e495149b | 879 | /* tsk == current */ |
3f2792ff | 880 | context->pid = tsk->pid; |
419c58f1 AV |
881 | if (!context->ppid) |
882 | context->ppid = sys_getppid(); | |
3f2792ff AV |
883 | context->uid = tsk->uid; |
884 | context->gid = tsk->gid; | |
885 | context->euid = tsk->euid; | |
886 | context->suid = tsk->suid; | |
887 | context->fsuid = tsk->fsuid; | |
888 | context->egid = tsk->egid; | |
889 | context->sgid = tsk->sgid; | |
890 | context->fsgid = tsk->fsgid; | |
891 | context->personality = tsk->personality; | |
e495149b AV |
892 | |
893 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_SYSCALL); | |
1da177e4 LT |
894 | if (!ab) |
895 | return; /* audit_panic has been called */ | |
bccf6ae0 DW |
896 | audit_log_format(ab, "arch=%x syscall=%d", |
897 | context->arch, context->major); | |
1da177e4 LT |
898 | if (context->personality != PER_LINUX) |
899 | audit_log_format(ab, " per=%lx", context->personality); | |
900 | if (context->return_valid) | |
2fd6f58b DW |
901 | audit_log_format(ab, " success=%s exit=%ld", |
902 | (context->return_valid==AUDITSC_SUCCESS)?"yes":"no", | |
903 | context->return_code); | |
eb84a20e AC |
904 | |
905 | mutex_lock(&tty_mutex); | |
24ec839c | 906 | read_lock(&tasklist_lock); |
45d9bb0e AV |
907 | if (tsk->signal && tsk->signal->tty && tsk->signal->tty->name) |
908 | tty = tsk->signal->tty->name; | |
a6c043a8 SG |
909 | else |
910 | tty = "(none)"; | |
24ec839c | 911 | read_unlock(&tasklist_lock); |
1da177e4 LT |
912 | audit_log_format(ab, |
913 | " a0=%lx a1=%lx a2=%lx a3=%lx items=%d" | |
f46038ff | 914 | " ppid=%d pid=%d auid=%u uid=%u gid=%u" |
326e9c8b | 915 | " euid=%u suid=%u fsuid=%u" |
a6c043a8 | 916 | " egid=%u sgid=%u fsgid=%u tty=%s", |
1da177e4 LT |
917 | context->argv[0], |
918 | context->argv[1], | |
919 | context->argv[2], | |
920 | context->argv[3], | |
921 | context->name_count, | |
f46038ff | 922 | context->ppid, |
1da177e4 LT |
923 | context->pid, |
924 | context->loginuid, | |
925 | context->uid, | |
926 | context->gid, | |
927 | context->euid, context->suid, context->fsuid, | |
a6c043a8 | 928 | context->egid, context->sgid, context->fsgid, tty); |
eb84a20e AC |
929 | |
930 | mutex_unlock(&tty_mutex); | |
931 | ||
e495149b | 932 | audit_log_task_info(ab, tsk); |
5adc8a6a AG |
933 | if (context->filterkey) { |
934 | audit_log_format(ab, " key="); | |
935 | audit_log_untrustedstring(ab, context->filterkey); | |
936 | } else | |
937 | audit_log_format(ab, " key=(null)"); | |
1da177e4 | 938 | audit_log_end(ab); |
1da177e4 | 939 | |
7551ced3 | 940 | for (aux = context->aux; aux; aux = aux->next) { |
c0404993 | 941 | |
e495149b | 942 | ab = audit_log_start(context, GFP_KERNEL, aux->type); |
1da177e4 LT |
943 | if (!ab) |
944 | continue; /* audit_panic has been called */ | |
945 | ||
1da177e4 | 946 | switch (aux->type) { |
20ca73bc GW |
947 | case AUDIT_MQ_OPEN: { |
948 | struct audit_aux_data_mq_open *axi = (void *)aux; | |
949 | audit_log_format(ab, | |
950 | "oflag=0x%x mode=%#o mq_flags=0x%lx mq_maxmsg=%ld " | |
951 | "mq_msgsize=%ld mq_curmsgs=%ld", | |
952 | axi->oflag, axi->mode, axi->attr.mq_flags, | |
953 | axi->attr.mq_maxmsg, axi->attr.mq_msgsize, | |
954 | axi->attr.mq_curmsgs); | |
955 | break; } | |
956 | ||
957 | case AUDIT_MQ_SENDRECV: { | |
958 | struct audit_aux_data_mq_sendrecv *axi = (void *)aux; | |
959 | audit_log_format(ab, | |
960 | "mqdes=%d msg_len=%zd msg_prio=%u " | |
961 | "abs_timeout_sec=%ld abs_timeout_nsec=%ld", | |
962 | axi->mqdes, axi->msg_len, axi->msg_prio, | |
963 | axi->abs_timeout.tv_sec, axi->abs_timeout.tv_nsec); | |
964 | break; } | |
965 | ||
966 | case AUDIT_MQ_NOTIFY: { | |
967 | struct audit_aux_data_mq_notify *axi = (void *)aux; | |
968 | audit_log_format(ab, | |
969 | "mqdes=%d sigev_signo=%d", | |
970 | axi->mqdes, | |
971 | axi->notification.sigev_signo); | |
972 | break; } | |
973 | ||
974 | case AUDIT_MQ_GETSETATTR: { | |
975 | struct audit_aux_data_mq_getsetattr *axi = (void *)aux; | |
976 | audit_log_format(ab, | |
977 | "mqdes=%d mq_flags=0x%lx mq_maxmsg=%ld mq_msgsize=%ld " | |
978 | "mq_curmsgs=%ld ", | |
979 | axi->mqdes, | |
980 | axi->mqstat.mq_flags, axi->mqstat.mq_maxmsg, | |
981 | axi->mqstat.mq_msgsize, axi->mqstat.mq_curmsgs); | |
982 | break; } | |
983 | ||
c0404993 | 984 | case AUDIT_IPC: { |
1da177e4 LT |
985 | struct audit_aux_data_ipcctl *axi = (void *)aux; |
986 | audit_log_format(ab, | |
5b9a4262 | 987 | "ouid=%u ogid=%u mode=%#o", |
ac03221a | 988 | axi->uid, axi->gid, axi->mode); |
9c7aa6aa SG |
989 | if (axi->osid != 0) { |
990 | char *ctx = NULL; | |
991 | u32 len; | |
1a70cd40 | 992 | if (selinux_sid_to_string( |
9c7aa6aa | 993 | axi->osid, &ctx, &len)) { |
ce29b682 | 994 | audit_log_format(ab, " osid=%u", |
9c7aa6aa SG |
995 | axi->osid); |
996 | call_panic = 1; | |
997 | } else | |
998 | audit_log_format(ab, " obj=%s", ctx); | |
999 | kfree(ctx); | |
1000 | } | |
3ec3b2fb DW |
1001 | break; } |
1002 | ||
073115d6 SG |
1003 | case AUDIT_IPC_SET_PERM: { |
1004 | struct audit_aux_data_ipcctl *axi = (void *)aux; | |
1005 | audit_log_format(ab, | |
5b9a4262 | 1006 | "qbytes=%lx ouid=%u ogid=%u mode=%#o", |
073115d6 | 1007 | axi->qbytes, axi->uid, axi->gid, axi->mode); |
073115d6 | 1008 | break; } |
ac03221a | 1009 | |
473ae30b AV |
1010 | case AUDIT_EXECVE: { |
1011 | struct audit_aux_data_execve *axi = (void *)aux; | |
bdf4c48a | 1012 | audit_log_execve_info(ab, axi); |
473ae30b | 1013 | break; } |
073115d6 | 1014 | |
3ec3b2fb DW |
1015 | case AUDIT_SOCKETCALL: { |
1016 | int i; | |
1017 | struct audit_aux_data_socketcall *axs = (void *)aux; | |
1018 | audit_log_format(ab, "nargs=%d", axs->nargs); | |
1019 | for (i=0; i<axs->nargs; i++) | |
1020 | audit_log_format(ab, " a%d=%lx", i, axs->args[i]); | |
1021 | break; } | |
1022 | ||
1023 | case AUDIT_SOCKADDR: { | |
1024 | struct audit_aux_data_sockaddr *axs = (void *)aux; | |
1025 | ||
1026 | audit_log_format(ab, "saddr="); | |
1027 | audit_log_hex(ab, axs->a, axs->len); | |
1028 | break; } | |
01116105 | 1029 | |
db349509 AV |
1030 | case AUDIT_FD_PAIR: { |
1031 | struct audit_aux_data_fd_pair *axs = (void *)aux; | |
1032 | audit_log_format(ab, "fd0=%d fd1=%d", axs->fd[0], axs->fd[1]); | |
1033 | break; } | |
1034 | ||
1da177e4 LT |
1035 | } |
1036 | audit_log_end(ab); | |
1da177e4 LT |
1037 | } |
1038 | ||
e54dc243 AG |
1039 | for (aux = context->aux_pids; aux; aux = aux->next) { |
1040 | struct audit_aux_data_pids *axs = (void *)aux; | |
1041 | int i; | |
1042 | ||
1043 | for (i = 0; i < axs->pid_count; i++) | |
1044 | if (audit_log_pid_context(context, axs->target_pid[i], | |
1045 | axs->target_sid[i])) | |
1046 | call_panic = 1; | |
a5cb013d AV |
1047 | } |
1048 | ||
e54dc243 AG |
1049 | if (context->target_pid && |
1050 | audit_log_pid_context(context, context->target_pid, | |
1051 | context->target_sid)) | |
1052 | call_panic = 1; | |
1053 | ||
8f37d47c | 1054 | if (context->pwd && context->pwdmnt) { |
e495149b | 1055 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD); |
8f37d47c DW |
1056 | if (ab) { |
1057 | audit_log_d_path(ab, "cwd=", context->pwd, context->pwdmnt); | |
1058 | audit_log_end(ab); | |
1059 | } | |
1060 | } | |
1da177e4 | 1061 | for (i = 0; i < context->name_count; i++) { |
9c937dcc | 1062 | struct audit_names *n = &context->names[i]; |
73241ccc | 1063 | |
e495149b | 1064 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_PATH); |
1da177e4 LT |
1065 | if (!ab) |
1066 | continue; /* audit_panic has been called */ | |
8f37d47c | 1067 | |
1da177e4 | 1068 | audit_log_format(ab, "item=%d", i); |
73241ccc | 1069 | |
9c937dcc AG |
1070 | if (n->name) { |
1071 | switch(n->name_len) { | |
1072 | case AUDIT_NAME_FULL: | |
1073 | /* log the full path */ | |
1074 | audit_log_format(ab, " name="); | |
1075 | audit_log_untrustedstring(ab, n->name); | |
1076 | break; | |
1077 | case 0: | |
1078 | /* name was specified as a relative path and the | |
1079 | * directory component is the cwd */ | |
1080 | audit_log_d_path(ab, " name=", context->pwd, | |
1081 | context->pwdmnt); | |
1082 | break; | |
1083 | default: | |
1084 | /* log the name's directory component */ | |
1085 | audit_log_format(ab, " name="); | |
1086 | audit_log_n_untrustedstring(ab, n->name_len, | |
1087 | n->name); | |
1088 | } | |
1089 | } else | |
1090 | audit_log_format(ab, " name=(null)"); | |
1091 | ||
1092 | if (n->ino != (unsigned long)-1) { | |
1093 | audit_log_format(ab, " inode=%lu" | |
1094 | " dev=%02x:%02x mode=%#o" | |
1095 | " ouid=%u ogid=%u rdev=%02x:%02x", | |
1096 | n->ino, | |
1097 | MAJOR(n->dev), | |
1098 | MINOR(n->dev), | |
1099 | n->mode, | |
1100 | n->uid, | |
1101 | n->gid, | |
1102 | MAJOR(n->rdev), | |
1103 | MINOR(n->rdev)); | |
1104 | } | |
1105 | if (n->osid != 0) { | |
1b50eed9 SG |
1106 | char *ctx = NULL; |
1107 | u32 len; | |
1a70cd40 | 1108 | if (selinux_sid_to_string( |
9c937dcc AG |
1109 | n->osid, &ctx, &len)) { |
1110 | audit_log_format(ab, " osid=%u", n->osid); | |
9c7aa6aa | 1111 | call_panic = 2; |
1b50eed9 SG |
1112 | } else |
1113 | audit_log_format(ab, " obj=%s", ctx); | |
1114 | kfree(ctx); | |
8c8570fb DK |
1115 | } |
1116 | ||
1da177e4 LT |
1117 | audit_log_end(ab); |
1118 | } | |
9c7aa6aa SG |
1119 | if (call_panic) |
1120 | audit_panic("error converting sid to string"); | |
1da177e4 LT |
1121 | } |
1122 | ||
b0dd25a8 RD |
1123 | /** |
1124 | * audit_free - free a per-task audit context | |
1125 | * @tsk: task whose audit context block to free | |
1126 | * | |
fa84cb93 | 1127 | * Called from copy_process and do_exit |
b0dd25a8 | 1128 | */ |
1da177e4 LT |
1129 | void audit_free(struct task_struct *tsk) |
1130 | { | |
1131 | struct audit_context *context; | |
1132 | ||
1da177e4 | 1133 | context = audit_get_context(tsk, 0, 0); |
1da177e4 LT |
1134 | if (likely(!context)) |
1135 | return; | |
1136 | ||
1137 | /* Check for system calls that do not go through the exit | |
f5561964 DW |
1138 | * function (e.g., exit_group), then free context block. |
1139 | * We use GFP_ATOMIC here because we might be doing this | |
1140 | * in the context of the idle thread */ | |
e495149b | 1141 | /* that can happen only if we are called from do_exit() */ |
f7056d64 | 1142 | if (context->in_syscall && context->auditable) |
e495149b | 1143 | audit_log_exit(context, tsk); |
1da177e4 LT |
1144 | |
1145 | audit_free_context(context); | |
1146 | } | |
1147 | ||
b0dd25a8 RD |
1148 | /** |
1149 | * audit_syscall_entry - fill in an audit record at syscall entry | |
1150 | * @tsk: task being audited | |
1151 | * @arch: architecture type | |
1152 | * @major: major syscall type (function) | |
1153 | * @a1: additional syscall register 1 | |
1154 | * @a2: additional syscall register 2 | |
1155 | * @a3: additional syscall register 3 | |
1156 | * @a4: additional syscall register 4 | |
1157 | * | |
1158 | * Fill in audit context at syscall entry. This only happens if the | |
1da177e4 LT |
1159 | * audit context was created when the task was created and the state or |
1160 | * filters demand the audit context be built. If the state from the | |
1161 | * per-task filter or from the per-syscall filter is AUDIT_RECORD_CONTEXT, | |
1162 | * then the record will be written at syscall exit time (otherwise, it | |
1163 | * will only be written if another part of the kernel requests that it | |
b0dd25a8 RD |
1164 | * be written). |
1165 | */ | |
5411be59 | 1166 | void audit_syscall_entry(int arch, int major, |
1da177e4 LT |
1167 | unsigned long a1, unsigned long a2, |
1168 | unsigned long a3, unsigned long a4) | |
1169 | { | |
5411be59 | 1170 | struct task_struct *tsk = current; |
1da177e4 LT |
1171 | struct audit_context *context = tsk->audit_context; |
1172 | enum audit_state state; | |
1173 | ||
1174 | BUG_ON(!context); | |
1175 | ||
b0dd25a8 RD |
1176 | /* |
1177 | * This happens only on certain architectures that make system | |
1da177e4 LT |
1178 | * calls in kernel_thread via the entry.S interface, instead of |
1179 | * with direct calls. (If you are porting to a new | |
1180 | * architecture, hitting this condition can indicate that you | |
1181 | * got the _exit/_leave calls backward in entry.S.) | |
1182 | * | |
1183 | * i386 no | |
1184 | * x86_64 no | |
2ef9481e | 1185 | * ppc64 yes (see arch/powerpc/platforms/iseries/misc.S) |
1da177e4 LT |
1186 | * |
1187 | * This also happens with vm86 emulation in a non-nested manner | |
1188 | * (entries without exits), so this case must be caught. | |
1189 | */ | |
1190 | if (context->in_syscall) { | |
1191 | struct audit_context *newctx; | |
1192 | ||
1da177e4 LT |
1193 | #if AUDIT_DEBUG |
1194 | printk(KERN_ERR | |
1195 | "audit(:%d) pid=%d in syscall=%d;" | |
1196 | " entering syscall=%d\n", | |
1197 | context->serial, tsk->pid, context->major, major); | |
1198 | #endif | |
1199 | newctx = audit_alloc_context(context->state); | |
1200 | if (newctx) { | |
1201 | newctx->previous = context; | |
1202 | context = newctx; | |
1203 | tsk->audit_context = newctx; | |
1204 | } else { | |
1205 | /* If we can't alloc a new context, the best we | |
1206 | * can do is to leak memory (any pending putname | |
1207 | * will be lost). The only other alternative is | |
1208 | * to abandon auditing. */ | |
1209 | audit_zero_context(context, context->state); | |
1210 | } | |
1211 | } | |
1212 | BUG_ON(context->in_syscall || context->name_count); | |
1213 | ||
1214 | if (!audit_enabled) | |
1215 | return; | |
1216 | ||
2fd6f58b | 1217 | context->arch = arch; |
1da177e4 LT |
1218 | context->major = major; |
1219 | context->argv[0] = a1; | |
1220 | context->argv[1] = a2; | |
1221 | context->argv[2] = a3; | |
1222 | context->argv[3] = a4; | |
1223 | ||
1224 | state = context->state; | |
d51374ad AV |
1225 | context->dummy = !audit_n_rules; |
1226 | if (!context->dummy && (state == AUDIT_SETUP_CONTEXT || state == AUDIT_BUILD_CONTEXT)) | |
0f45aa18 | 1227 | state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_ENTRY]); |
1da177e4 LT |
1228 | if (likely(state == AUDIT_DISABLED)) |
1229 | return; | |
1230 | ||
ce625a80 | 1231 | context->serial = 0; |
1da177e4 LT |
1232 | context->ctime = CURRENT_TIME; |
1233 | context->in_syscall = 1; | |
1234 | context->auditable = !!(state == AUDIT_RECORD_CONTEXT); | |
419c58f1 | 1235 | context->ppid = 0; |
1da177e4 LT |
1236 | } |
1237 | ||
b0dd25a8 RD |
1238 | /** |
1239 | * audit_syscall_exit - deallocate audit context after a system call | |
1240 | * @tsk: task being audited | |
1241 | * @valid: success/failure flag | |
1242 | * @return_code: syscall return value | |
1243 | * | |
1244 | * Tear down after system call. If the audit context has been marked as | |
1da177e4 LT |
1245 | * auditable (either because of the AUDIT_RECORD_CONTEXT state from |
1246 | * filtering, or because some other part of the kernel write an audit | |
1247 | * message), then write out the syscall information. In call cases, | |
b0dd25a8 RD |
1248 | * free the names stored from getname(). |
1249 | */ | |
5411be59 | 1250 | void audit_syscall_exit(int valid, long return_code) |
1da177e4 | 1251 | { |
5411be59 | 1252 | struct task_struct *tsk = current; |
1da177e4 LT |
1253 | struct audit_context *context; |
1254 | ||
2fd6f58b | 1255 | context = audit_get_context(tsk, valid, return_code); |
1da177e4 | 1256 | |
1da177e4 | 1257 | if (likely(!context)) |
97e94c45 | 1258 | return; |
1da177e4 | 1259 | |
f7056d64 | 1260 | if (context->in_syscall && context->auditable) |
e495149b | 1261 | audit_log_exit(context, tsk); |
1da177e4 LT |
1262 | |
1263 | context->in_syscall = 0; | |
1264 | context->auditable = 0; | |
2fd6f58b | 1265 | |
1da177e4 LT |
1266 | if (context->previous) { |
1267 | struct audit_context *new_context = context->previous; | |
1268 | context->previous = NULL; | |
1269 | audit_free_context(context); | |
1270 | tsk->audit_context = new_context; | |
1271 | } else { | |
1272 | audit_free_names(context); | |
1273 | audit_free_aux(context); | |
e54dc243 AG |
1274 | context->aux = NULL; |
1275 | context->aux_pids = NULL; | |
a5cb013d | 1276 | context->target_pid = 0; |
e54dc243 | 1277 | context->target_sid = 0; |
5adc8a6a AG |
1278 | kfree(context->filterkey); |
1279 | context->filterkey = NULL; | |
1da177e4 LT |
1280 | tsk->audit_context = context; |
1281 | } | |
1da177e4 LT |
1282 | } |
1283 | ||
b0dd25a8 RD |
1284 | /** |
1285 | * audit_getname - add a name to the list | |
1286 | * @name: name to add | |
1287 | * | |
1288 | * Add a name to the list of audit names for this context. | |
1289 | * Called from fs/namei.c:getname(). | |
1290 | */ | |
d8945bb5 | 1291 | void __audit_getname(const char *name) |
1da177e4 LT |
1292 | { |
1293 | struct audit_context *context = current->audit_context; | |
1294 | ||
d8945bb5 | 1295 | if (IS_ERR(name) || !name) |
1da177e4 LT |
1296 | return; |
1297 | ||
1298 | if (!context->in_syscall) { | |
1299 | #if AUDIT_DEBUG == 2 | |
1300 | printk(KERN_ERR "%s:%d(:%d): ignoring getname(%p)\n", | |
1301 | __FILE__, __LINE__, context->serial, name); | |
1302 | dump_stack(); | |
1303 | #endif | |
1304 | return; | |
1305 | } | |
1306 | BUG_ON(context->name_count >= AUDIT_NAMES); | |
1307 | context->names[context->name_count].name = name; | |
9c937dcc AG |
1308 | context->names[context->name_count].name_len = AUDIT_NAME_FULL; |
1309 | context->names[context->name_count].name_put = 1; | |
1da177e4 | 1310 | context->names[context->name_count].ino = (unsigned long)-1; |
e41e8bde | 1311 | context->names[context->name_count].osid = 0; |
1da177e4 | 1312 | ++context->name_count; |
8f37d47c DW |
1313 | if (!context->pwd) { |
1314 | read_lock(¤t->fs->lock); | |
1315 | context->pwd = dget(current->fs->pwd); | |
1316 | context->pwdmnt = mntget(current->fs->pwdmnt); | |
1317 | read_unlock(¤t->fs->lock); | |
1318 | } | |
1319 | ||
1da177e4 LT |
1320 | } |
1321 | ||
b0dd25a8 RD |
1322 | /* audit_putname - intercept a putname request |
1323 | * @name: name to intercept and delay for putname | |
1324 | * | |
1325 | * If we have stored the name from getname in the audit context, | |
1326 | * then we delay the putname until syscall exit. | |
1327 | * Called from include/linux/fs.h:putname(). | |
1328 | */ | |
1da177e4 LT |
1329 | void audit_putname(const char *name) |
1330 | { | |
1331 | struct audit_context *context = current->audit_context; | |
1332 | ||
1333 | BUG_ON(!context); | |
1334 | if (!context->in_syscall) { | |
1335 | #if AUDIT_DEBUG == 2 | |
1336 | printk(KERN_ERR "%s:%d(:%d): __putname(%p)\n", | |
1337 | __FILE__, __LINE__, context->serial, name); | |
1338 | if (context->name_count) { | |
1339 | int i; | |
1340 | for (i = 0; i < context->name_count; i++) | |
1341 | printk(KERN_ERR "name[%d] = %p = %s\n", i, | |
1342 | context->names[i].name, | |
73241ccc | 1343 | context->names[i].name ?: "(null)"); |
1da177e4 LT |
1344 | } |
1345 | #endif | |
1346 | __putname(name); | |
1347 | } | |
1348 | #if AUDIT_DEBUG | |
1349 | else { | |
1350 | ++context->put_count; | |
1351 | if (context->put_count > context->name_count) { | |
1352 | printk(KERN_ERR "%s:%d(:%d): major=%d" | |
1353 | " in_syscall=%d putname(%p) name_count=%d" | |
1354 | " put_count=%d\n", | |
1355 | __FILE__, __LINE__, | |
1356 | context->serial, context->major, | |
1357 | context->in_syscall, name, context->name_count, | |
1358 | context->put_count); | |
1359 | dump_stack(); | |
1360 | } | |
1361 | } | |
1362 | #endif | |
1363 | } | |
1364 | ||
5712e88f AG |
1365 | static int audit_inc_name_count(struct audit_context *context, |
1366 | const struct inode *inode) | |
1367 | { | |
1368 | if (context->name_count >= AUDIT_NAMES) { | |
1369 | if (inode) | |
1370 | printk(KERN_DEBUG "name_count maxed, losing inode data: " | |
1371 | "dev=%02x:%02x, inode=%lu", | |
1372 | MAJOR(inode->i_sb->s_dev), | |
1373 | MINOR(inode->i_sb->s_dev), | |
1374 | inode->i_ino); | |
1375 | ||
1376 | else | |
1377 | printk(KERN_DEBUG "name_count maxed, losing inode data"); | |
1378 | return 1; | |
1379 | } | |
1380 | context->name_count++; | |
1381 | #if AUDIT_DEBUG | |
1382 | context->ino_count++; | |
1383 | #endif | |
1384 | return 0; | |
1385 | } | |
1386 | ||
3e2efce0 AG |
1387 | /* Copy inode data into an audit_names. */ |
1388 | static void audit_copy_inode(struct audit_names *name, const struct inode *inode) | |
8c8570fb | 1389 | { |
3e2efce0 AG |
1390 | name->ino = inode->i_ino; |
1391 | name->dev = inode->i_sb->s_dev; | |
1392 | name->mode = inode->i_mode; | |
1393 | name->uid = inode->i_uid; | |
1394 | name->gid = inode->i_gid; | |
1395 | name->rdev = inode->i_rdev; | |
1396 | selinux_get_inode_sid(inode, &name->osid); | |
8c8570fb DK |
1397 | } |
1398 | ||
b0dd25a8 RD |
1399 | /** |
1400 | * audit_inode - store the inode and device from a lookup | |
1401 | * @name: name being audited | |
1402 | * @inode: inode being audited | |
b0dd25a8 RD |
1403 | * |
1404 | * Called from fs/namei.c:path_lookup(). | |
1405 | */ | |
9c937dcc | 1406 | void __audit_inode(const char *name, const struct inode *inode) |
1da177e4 LT |
1407 | { |
1408 | int idx; | |
1409 | struct audit_context *context = current->audit_context; | |
1410 | ||
1411 | if (!context->in_syscall) | |
1412 | return; | |
1413 | if (context->name_count | |
1414 | && context->names[context->name_count-1].name | |
1415 | && context->names[context->name_count-1].name == name) | |
1416 | idx = context->name_count - 1; | |
1417 | else if (context->name_count > 1 | |
1418 | && context->names[context->name_count-2].name | |
1419 | && context->names[context->name_count-2].name == name) | |
1420 | idx = context->name_count - 2; | |
1421 | else { | |
1422 | /* FIXME: how much do we care about inodes that have no | |
1423 | * associated name? */ | |
5712e88f | 1424 | if (audit_inc_name_count(context, inode)) |
1da177e4 | 1425 | return; |
5712e88f | 1426 | idx = context->name_count - 1; |
1da177e4 | 1427 | context->names[idx].name = NULL; |
1da177e4 | 1428 | } |
3e2efce0 | 1429 | audit_copy_inode(&context->names[idx], inode); |
73241ccc AG |
1430 | } |
1431 | ||
1432 | /** | |
1433 | * audit_inode_child - collect inode info for created/removed objects | |
1434 | * @dname: inode's dentry name | |
1435 | * @inode: inode being audited | |
73d3ec5a | 1436 | * @parent: inode of dentry parent |
73241ccc AG |
1437 | * |
1438 | * For syscalls that create or remove filesystem objects, audit_inode | |
1439 | * can only collect information for the filesystem object's parent. | |
1440 | * This call updates the audit context with the child's information. | |
1441 | * Syscalls that create a new filesystem object must be hooked after | |
1442 | * the object is created. Syscalls that remove a filesystem object | |
1443 | * must be hooked prior, in order to capture the target inode during | |
1444 | * unsuccessful attempts. | |
1445 | */ | |
1446 | void __audit_inode_child(const char *dname, const struct inode *inode, | |
73d3ec5a | 1447 | const struct inode *parent) |
73241ccc AG |
1448 | { |
1449 | int idx; | |
1450 | struct audit_context *context = current->audit_context; | |
5712e88f | 1451 | const char *found_parent = NULL, *found_child = NULL; |
9c937dcc | 1452 | int dirlen = 0; |
73241ccc AG |
1453 | |
1454 | if (!context->in_syscall) | |
1455 | return; | |
1456 | ||
1457 | /* determine matching parent */ | |
f368c07d | 1458 | if (!dname) |
5712e88f | 1459 | goto add_names; |
73241ccc | 1460 | |
5712e88f AG |
1461 | /* parent is more likely, look for it first */ |
1462 | for (idx = 0; idx < context->name_count; idx++) { | |
1463 | struct audit_names *n = &context->names[idx]; | |
f368c07d | 1464 | |
5712e88f AG |
1465 | if (!n->name) |
1466 | continue; | |
1467 | ||
1468 | if (n->ino == parent->i_ino && | |
1469 | !audit_compare_dname_path(dname, n->name, &dirlen)) { | |
1470 | n->name_len = dirlen; /* update parent data in place */ | |
1471 | found_parent = n->name; | |
1472 | goto add_names; | |
f368c07d | 1473 | } |
5712e88f | 1474 | } |
73241ccc | 1475 | |
5712e88f AG |
1476 | /* no matching parent, look for matching child */ |
1477 | for (idx = 0; idx < context->name_count; idx++) { | |
1478 | struct audit_names *n = &context->names[idx]; | |
1479 | ||
1480 | if (!n->name) | |
1481 | continue; | |
1482 | ||
1483 | /* strcmp() is the more likely scenario */ | |
1484 | if (!strcmp(dname, n->name) || | |
1485 | !audit_compare_dname_path(dname, n->name, &dirlen)) { | |
1486 | if (inode) | |
1487 | audit_copy_inode(n, inode); | |
1488 | else | |
1489 | n->ino = (unsigned long)-1; | |
1490 | found_child = n->name; | |
1491 | goto add_names; | |
1492 | } | |
ac9910ce | 1493 | } |
5712e88f AG |
1494 | |
1495 | add_names: | |
1496 | if (!found_parent) { | |
1497 | if (audit_inc_name_count(context, parent)) | |
ac9910ce | 1498 | return; |
5712e88f AG |
1499 | idx = context->name_count - 1; |
1500 | context->names[idx].name = NULL; | |
73d3ec5a AG |
1501 | audit_copy_inode(&context->names[idx], parent); |
1502 | } | |
5712e88f AG |
1503 | |
1504 | if (!found_child) { | |
1505 | if (audit_inc_name_count(context, inode)) | |
1506 | return; | |
1507 | idx = context->name_count - 1; | |
1508 | ||
1509 | /* Re-use the name belonging to the slot for a matching parent | |
1510 | * directory. All names for this context are relinquished in | |
1511 | * audit_free_names() */ | |
1512 | if (found_parent) { | |
1513 | context->names[idx].name = found_parent; | |
1514 | context->names[idx].name_len = AUDIT_NAME_FULL; | |
1515 | /* don't call __putname() */ | |
1516 | context->names[idx].name_put = 0; | |
1517 | } else { | |
1518 | context->names[idx].name = NULL; | |
1519 | } | |
1520 | ||
1521 | if (inode) | |
1522 | audit_copy_inode(&context->names[idx], inode); | |
1523 | else | |
1524 | context->names[idx].ino = (unsigned long)-1; | |
1525 | } | |
3e2efce0 | 1526 | } |
50e437d5 | 1527 | EXPORT_SYMBOL_GPL(__audit_inode_child); |
3e2efce0 | 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 | } |