Commit | Line | Data |
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85c8721f | 1 | /* auditsc.c -- System-call auditing support |
1da177e4 LT |
2 | * Handles all system-call specific auditing features. |
3 | * | |
4 | * Copyright 2003-2004 Red Hat Inc., Durham, North Carolina. | |
73241ccc | 5 | * Copyright 2005 Hewlett-Packard Development Company, L.P. |
20ca73bc | 6 | * Copyright (C) 2005, 2006 IBM Corporation |
1da177e4 LT |
7 | * All Rights Reserved. |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
22 | * | |
23 | * Written by Rickard E. (Rik) Faith <faith@redhat.com> | |
24 | * | |
25 | * Many of the ideas implemented here are from Stephen C. Tweedie, | |
26 | * especially the idea of avoiding a copy by using getname. | |
27 | * | |
28 | * The method for actual interception of syscall entry and exit (not in | |
29 | * this file -- see entry.S) is based on a GPL'd patch written by | |
30 | * okir@suse.de and Copyright 2003 SuSE Linux AG. | |
31 | * | |
20ca73bc GW |
32 | * POSIX message queue support added by George Wilson <ltcgcw@us.ibm.com>, |
33 | * 2006. | |
34 | * | |
b63862f4 DK |
35 | * The support of additional filter rules compares (>, <, >=, <=) was |
36 | * added by Dustin Kirkland <dustin.kirkland@us.ibm.com>, 2005. | |
37 | * | |
73241ccc AG |
38 | * Modified by Amy Griffis <amy.griffis@hp.com> to collect additional |
39 | * filesystem information. | |
8c8570fb DK |
40 | * |
41 | * Subject and object context labeling support added by <danjones@us.ibm.com> | |
42 | * and <dustin.kirkland@us.ibm.com> for LSPP certification compliance. | |
1da177e4 LT |
43 | */ |
44 | ||
45 | #include <linux/init.h> | |
1da177e4 | 46 | #include <asm/types.h> |
715b49ef | 47 | #include <asm/atomic.h> |
73241ccc AG |
48 | #include <asm/types.h> |
49 | #include <linux/fs.h> | |
50 | #include <linux/namei.h> | |
1da177e4 LT |
51 | #include <linux/mm.h> |
52 | #include <linux/module.h> | |
01116105 | 53 | #include <linux/mount.h> |
3ec3b2fb | 54 | #include <linux/socket.h> |
20ca73bc | 55 | #include <linux/mqueue.h> |
1da177e4 LT |
56 | #include <linux/audit.h> |
57 | #include <linux/personality.h> | |
58 | #include <linux/time.h> | |
5bb289b5 | 59 | #include <linux/netlink.h> |
f5561964 | 60 | #include <linux/compiler.h> |
1da177e4 | 61 | #include <asm/unistd.h> |
8c8570fb | 62 | #include <linux/security.h> |
fe7752ba | 63 | #include <linux/list.h> |
a6c043a8 | 64 | #include <linux/tty.h> |
3dc7e315 | 65 | #include <linux/selinux.h> |
473ae30b | 66 | #include <linux/binfmts.h> |
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; | |
156 | char mem[0]; | |
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 | ||
01116105 SS |
176 | struct audit_aux_data_path { |
177 | struct audit_aux_data d; | |
178 | struct dentry *dentry; | |
179 | struct vfsmount *mnt; | |
180 | }; | |
1da177e4 | 181 | |
e54dc243 AG |
182 | struct audit_aux_data_pids { |
183 | struct audit_aux_data d; | |
184 | pid_t target_pid[AUDIT_AUX_PIDS]; | |
185 | u32 target_sid[AUDIT_AUX_PIDS]; | |
186 | int pid_count; | |
187 | }; | |
188 | ||
1da177e4 LT |
189 | /* The per-task audit context. */ |
190 | struct audit_context { | |
d51374ad | 191 | int dummy; /* must be the first element */ |
1da177e4 LT |
192 | int in_syscall; /* 1 if task is in a syscall */ |
193 | enum audit_state state; | |
194 | unsigned int serial; /* serial number for record */ | |
195 | struct timespec ctime; /* time of syscall entry */ | |
196 | uid_t loginuid; /* login uid (identity) */ | |
197 | int major; /* syscall number */ | |
198 | unsigned long argv[4]; /* syscall arguments */ | |
199 | int return_valid; /* return code is valid */ | |
2fd6f58b | 200 | long return_code;/* syscall return code */ |
1da177e4 LT |
201 | int auditable; /* 1 if record should be written */ |
202 | int name_count; | |
203 | struct audit_names names[AUDIT_NAMES]; | |
5adc8a6a | 204 | char * filterkey; /* key for rule that triggered record */ |
8f37d47c DW |
205 | struct dentry * pwd; |
206 | struct vfsmount * pwdmnt; | |
1da177e4 LT |
207 | struct audit_context *previous; /* For nested syscalls */ |
208 | struct audit_aux_data *aux; | |
e54dc243 | 209 | struct audit_aux_data *aux_pids; |
1da177e4 LT |
210 | |
211 | /* Save things to print about task_struct */ | |
f46038ff | 212 | pid_t pid, ppid; |
1da177e4 LT |
213 | uid_t uid, euid, suid, fsuid; |
214 | gid_t gid, egid, sgid, fsgid; | |
215 | unsigned long personality; | |
2fd6f58b | 216 | int arch; |
1da177e4 | 217 | |
a5cb013d AV |
218 | pid_t target_pid; |
219 | u32 target_sid; | |
220 | ||
1da177e4 LT |
221 | #if AUDIT_DEBUG |
222 | int put_count; | |
223 | int ino_count; | |
224 | #endif | |
225 | }; | |
226 | ||
55669bfa AV |
227 | #define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE]) |
228 | static inline int open_arg(int flags, int mask) | |
229 | { | |
230 | int n = ACC_MODE(flags); | |
231 | if (flags & (O_TRUNC | O_CREAT)) | |
232 | n |= AUDIT_PERM_WRITE; | |
233 | return n & mask; | |
234 | } | |
235 | ||
236 | static int audit_match_perm(struct audit_context *ctx, int mask) | |
237 | { | |
238 | unsigned n = ctx->major; | |
239 | switch (audit_classify_syscall(ctx->arch, n)) { | |
240 | case 0: /* native */ | |
241 | if ((mask & AUDIT_PERM_WRITE) && | |
242 | audit_match_class(AUDIT_CLASS_WRITE, n)) | |
243 | return 1; | |
244 | if ((mask & AUDIT_PERM_READ) && | |
245 | audit_match_class(AUDIT_CLASS_READ, n)) | |
246 | return 1; | |
247 | if ((mask & AUDIT_PERM_ATTR) && | |
248 | audit_match_class(AUDIT_CLASS_CHATTR, n)) | |
249 | return 1; | |
250 | return 0; | |
251 | case 1: /* 32bit on biarch */ | |
252 | if ((mask & AUDIT_PERM_WRITE) && | |
253 | audit_match_class(AUDIT_CLASS_WRITE_32, n)) | |
254 | return 1; | |
255 | if ((mask & AUDIT_PERM_READ) && | |
256 | audit_match_class(AUDIT_CLASS_READ_32, n)) | |
257 | return 1; | |
258 | if ((mask & AUDIT_PERM_ATTR) && | |
259 | audit_match_class(AUDIT_CLASS_CHATTR_32, n)) | |
260 | return 1; | |
261 | return 0; | |
262 | case 2: /* open */ | |
263 | return mask & ACC_MODE(ctx->argv[1]); | |
264 | case 3: /* openat */ | |
265 | return mask & ACC_MODE(ctx->argv[2]); | |
266 | case 4: /* socketcall */ | |
267 | return ((mask & AUDIT_PERM_WRITE) && ctx->argv[0] == SYS_BIND); | |
268 | case 5: /* execve */ | |
269 | return mask & AUDIT_PERM_EXEC; | |
270 | default: | |
271 | return 0; | |
272 | } | |
273 | } | |
274 | ||
f368c07d | 275 | /* Determine if any context name data matches a rule's watch data */ |
1da177e4 LT |
276 | /* Compare a task_struct with an audit_rule. Return 1 on match, 0 |
277 | * otherwise. */ | |
278 | static int audit_filter_rules(struct task_struct *tsk, | |
93315ed6 | 279 | struct audit_krule *rule, |
1da177e4 | 280 | struct audit_context *ctx, |
f368c07d | 281 | struct audit_names *name, |
1da177e4 LT |
282 | enum audit_state *state) |
283 | { | |
2ad312d2 | 284 | int i, j, need_sid = 1; |
3dc7e315 DG |
285 | u32 sid; |
286 | ||
1da177e4 | 287 | for (i = 0; i < rule->field_count; i++) { |
93315ed6 | 288 | struct audit_field *f = &rule->fields[i]; |
1da177e4 LT |
289 | int result = 0; |
290 | ||
93315ed6 | 291 | switch (f->type) { |
1da177e4 | 292 | case AUDIT_PID: |
93315ed6 | 293 | result = audit_comparator(tsk->pid, f->op, f->val); |
1da177e4 | 294 | break; |
3c66251e | 295 | case AUDIT_PPID: |
419c58f1 AV |
296 | if (ctx) { |
297 | if (!ctx->ppid) | |
298 | ctx->ppid = sys_getppid(); | |
3c66251e | 299 | result = audit_comparator(ctx->ppid, f->op, f->val); |
419c58f1 | 300 | } |
3c66251e | 301 | break; |
1da177e4 | 302 | case AUDIT_UID: |
93315ed6 | 303 | result = audit_comparator(tsk->uid, f->op, f->val); |
1da177e4 LT |
304 | break; |
305 | case AUDIT_EUID: | |
93315ed6 | 306 | result = audit_comparator(tsk->euid, f->op, f->val); |
1da177e4 LT |
307 | break; |
308 | case AUDIT_SUID: | |
93315ed6 | 309 | result = audit_comparator(tsk->suid, f->op, f->val); |
1da177e4 LT |
310 | break; |
311 | case AUDIT_FSUID: | |
93315ed6 | 312 | result = audit_comparator(tsk->fsuid, f->op, f->val); |
1da177e4 LT |
313 | break; |
314 | case AUDIT_GID: | |
93315ed6 | 315 | result = audit_comparator(tsk->gid, f->op, f->val); |
1da177e4 LT |
316 | break; |
317 | case AUDIT_EGID: | |
93315ed6 | 318 | result = audit_comparator(tsk->egid, f->op, f->val); |
1da177e4 LT |
319 | break; |
320 | case AUDIT_SGID: | |
93315ed6 | 321 | result = audit_comparator(tsk->sgid, f->op, f->val); |
1da177e4 LT |
322 | break; |
323 | case AUDIT_FSGID: | |
93315ed6 | 324 | result = audit_comparator(tsk->fsgid, f->op, f->val); |
1da177e4 LT |
325 | break; |
326 | case AUDIT_PERS: | |
93315ed6 | 327 | result = audit_comparator(tsk->personality, f->op, f->val); |
1da177e4 | 328 | break; |
2fd6f58b | 329 | case AUDIT_ARCH: |
b63862f4 | 330 | if (ctx) |
93315ed6 | 331 | result = audit_comparator(ctx->arch, f->op, f->val); |
2fd6f58b | 332 | break; |
1da177e4 LT |
333 | |
334 | case AUDIT_EXIT: | |
335 | if (ctx && ctx->return_valid) | |
93315ed6 | 336 | result = audit_comparator(ctx->return_code, f->op, f->val); |
1da177e4 LT |
337 | break; |
338 | case AUDIT_SUCCESS: | |
b01f2cc1 | 339 | if (ctx && ctx->return_valid) { |
93315ed6 AG |
340 | if (f->val) |
341 | result = audit_comparator(ctx->return_valid, f->op, AUDITSC_SUCCESS); | |
b01f2cc1 | 342 | else |
93315ed6 | 343 | result = audit_comparator(ctx->return_valid, f->op, AUDITSC_FAILURE); |
b01f2cc1 | 344 | } |
1da177e4 LT |
345 | break; |
346 | case AUDIT_DEVMAJOR: | |
f368c07d AG |
347 | if (name) |
348 | result = audit_comparator(MAJOR(name->dev), | |
349 | f->op, f->val); | |
350 | else if (ctx) { | |
1da177e4 | 351 | for (j = 0; j < ctx->name_count; j++) { |
93315ed6 | 352 | if (audit_comparator(MAJOR(ctx->names[j].dev), f->op, f->val)) { |
1da177e4 LT |
353 | ++result; |
354 | break; | |
355 | } | |
356 | } | |
357 | } | |
358 | break; | |
359 | case AUDIT_DEVMINOR: | |
f368c07d AG |
360 | if (name) |
361 | result = audit_comparator(MINOR(name->dev), | |
362 | f->op, f->val); | |
363 | else if (ctx) { | |
1da177e4 | 364 | for (j = 0; j < ctx->name_count; j++) { |
93315ed6 | 365 | if (audit_comparator(MINOR(ctx->names[j].dev), f->op, f->val)) { |
1da177e4 LT |
366 | ++result; |
367 | break; | |
368 | } | |
369 | } | |
370 | } | |
371 | break; | |
372 | case AUDIT_INODE: | |
f368c07d | 373 | if (name) |
9c937dcc | 374 | result = (name->ino == f->val); |
f368c07d | 375 | else if (ctx) { |
1da177e4 | 376 | for (j = 0; j < ctx->name_count; j++) { |
9c937dcc | 377 | if (audit_comparator(ctx->names[j].ino, f->op, f->val)) { |
1da177e4 LT |
378 | ++result; |
379 | break; | |
380 | } | |
381 | } | |
382 | } | |
383 | break; | |
f368c07d AG |
384 | case AUDIT_WATCH: |
385 | if (name && rule->watch->ino != (unsigned long)-1) | |
386 | result = (name->dev == rule->watch->dev && | |
9c937dcc | 387 | name->ino == rule->watch->ino); |
f368c07d | 388 | break; |
1da177e4 LT |
389 | case AUDIT_LOGINUID: |
390 | result = 0; | |
391 | if (ctx) | |
93315ed6 | 392 | result = audit_comparator(ctx->loginuid, f->op, f->val); |
1da177e4 | 393 | break; |
3a6b9f85 DG |
394 | case AUDIT_SUBJ_USER: |
395 | case AUDIT_SUBJ_ROLE: | |
396 | case AUDIT_SUBJ_TYPE: | |
397 | case AUDIT_SUBJ_SEN: | |
398 | case AUDIT_SUBJ_CLR: | |
3dc7e315 DG |
399 | /* NOTE: this may return negative values indicating |
400 | a temporary error. We simply treat this as a | |
401 | match for now to avoid losing information that | |
402 | may be wanted. An error message will also be | |
403 | logged upon error */ | |
2ad312d2 SG |
404 | if (f->se_rule) { |
405 | if (need_sid) { | |
62bac018 | 406 | selinux_get_task_sid(tsk, &sid); |
2ad312d2 SG |
407 | need_sid = 0; |
408 | } | |
3dc7e315 DG |
409 | result = selinux_audit_rule_match(sid, f->type, |
410 | f->op, | |
411 | f->se_rule, | |
412 | ctx); | |
2ad312d2 | 413 | } |
3dc7e315 | 414 | break; |
6e5a2d1d DG |
415 | case AUDIT_OBJ_USER: |
416 | case AUDIT_OBJ_ROLE: | |
417 | case AUDIT_OBJ_TYPE: | |
418 | case AUDIT_OBJ_LEV_LOW: | |
419 | case AUDIT_OBJ_LEV_HIGH: | |
420 | /* The above note for AUDIT_SUBJ_USER...AUDIT_SUBJ_CLR | |
421 | also applies here */ | |
422 | if (f->se_rule) { | |
423 | /* Find files that match */ | |
424 | if (name) { | |
425 | result = selinux_audit_rule_match( | |
426 | name->osid, f->type, f->op, | |
427 | f->se_rule, ctx); | |
428 | } else if (ctx) { | |
429 | for (j = 0; j < ctx->name_count; j++) { | |
430 | if (selinux_audit_rule_match( | |
431 | ctx->names[j].osid, | |
432 | f->type, f->op, | |
433 | f->se_rule, ctx)) { | |
434 | ++result; | |
435 | break; | |
436 | } | |
437 | } | |
438 | } | |
439 | /* Find ipc objects that match */ | |
440 | if (ctx) { | |
441 | struct audit_aux_data *aux; | |
442 | for (aux = ctx->aux; aux; | |
443 | aux = aux->next) { | |
444 | if (aux->type == AUDIT_IPC) { | |
445 | struct audit_aux_data_ipcctl *axi = (void *)aux; | |
446 | if (selinux_audit_rule_match(axi->osid, f->type, f->op, f->se_rule, ctx)) { | |
447 | ++result; | |
448 | break; | |
449 | } | |
450 | } | |
451 | } | |
452 | } | |
453 | } | |
454 | break; | |
1da177e4 LT |
455 | case AUDIT_ARG0: |
456 | case AUDIT_ARG1: | |
457 | case AUDIT_ARG2: | |
458 | case AUDIT_ARG3: | |
459 | if (ctx) | |
93315ed6 | 460 | result = audit_comparator(ctx->argv[f->type-AUDIT_ARG0], f->op, f->val); |
1da177e4 | 461 | break; |
5adc8a6a AG |
462 | case AUDIT_FILTERKEY: |
463 | /* ignore this field for filtering */ | |
464 | result = 1; | |
465 | break; | |
55669bfa AV |
466 | case AUDIT_PERM: |
467 | result = audit_match_perm(ctx, f->val); | |
468 | break; | |
1da177e4 LT |
469 | } |
470 | ||
1da177e4 LT |
471 | if (!result) |
472 | return 0; | |
473 | } | |
5adc8a6a AG |
474 | if (rule->filterkey) |
475 | ctx->filterkey = kstrdup(rule->filterkey, GFP_ATOMIC); | |
1da177e4 LT |
476 | switch (rule->action) { |
477 | case AUDIT_NEVER: *state = AUDIT_DISABLED; break; | |
1da177e4 LT |
478 | case AUDIT_ALWAYS: *state = AUDIT_RECORD_CONTEXT; break; |
479 | } | |
480 | return 1; | |
481 | } | |
482 | ||
483 | /* At process creation time, we can determine if system-call auditing is | |
484 | * completely disabled for this task. Since we only have the task | |
485 | * structure at this point, we can only check uid and gid. | |
486 | */ | |
487 | static enum audit_state audit_filter_task(struct task_struct *tsk) | |
488 | { | |
489 | struct audit_entry *e; | |
490 | enum audit_state state; | |
491 | ||
492 | rcu_read_lock(); | |
0f45aa18 | 493 | list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_TASK], list) { |
f368c07d | 494 | if (audit_filter_rules(tsk, &e->rule, NULL, NULL, &state)) { |
1da177e4 LT |
495 | rcu_read_unlock(); |
496 | return state; | |
497 | } | |
498 | } | |
499 | rcu_read_unlock(); | |
500 | return AUDIT_BUILD_CONTEXT; | |
501 | } | |
502 | ||
503 | /* At syscall entry and exit time, this filter is called if the | |
504 | * audit_state is not low enough that auditing cannot take place, but is | |
23f32d18 | 505 | * also not high enough that we already know we have to write an audit |
b0dd25a8 | 506 | * record (i.e., the state is AUDIT_SETUP_CONTEXT or AUDIT_BUILD_CONTEXT). |
1da177e4 LT |
507 | */ |
508 | static enum audit_state audit_filter_syscall(struct task_struct *tsk, | |
509 | struct audit_context *ctx, | |
510 | struct list_head *list) | |
511 | { | |
512 | struct audit_entry *e; | |
c3896495 | 513 | enum audit_state state; |
1da177e4 | 514 | |
351bb722 | 515 | if (audit_pid && tsk->tgid == audit_pid) |
f7056d64 DW |
516 | return AUDIT_DISABLED; |
517 | ||
1da177e4 | 518 | rcu_read_lock(); |
c3896495 | 519 | if (!list_empty(list)) { |
b63862f4 DK |
520 | int word = AUDIT_WORD(ctx->major); |
521 | int bit = AUDIT_BIT(ctx->major); | |
522 | ||
523 | list_for_each_entry_rcu(e, list, list) { | |
f368c07d AG |
524 | if ((e->rule.mask[word] & bit) == bit && |
525 | audit_filter_rules(tsk, &e->rule, ctx, NULL, | |
526 | &state)) { | |
527 | rcu_read_unlock(); | |
528 | return state; | |
529 | } | |
530 | } | |
531 | } | |
532 | rcu_read_unlock(); | |
533 | return AUDIT_BUILD_CONTEXT; | |
534 | } | |
535 | ||
536 | /* At syscall exit time, this filter is called if any audit_names[] have been | |
537 | * collected during syscall processing. We only check rules in sublists at hash | |
538 | * buckets applicable to the inode numbers in audit_names[]. | |
539 | * Regarding audit_state, same rules apply as for audit_filter_syscall(). | |
540 | */ | |
541 | enum audit_state audit_filter_inodes(struct task_struct *tsk, | |
542 | struct audit_context *ctx) | |
543 | { | |
544 | int i; | |
545 | struct audit_entry *e; | |
546 | enum audit_state state; | |
547 | ||
548 | if (audit_pid && tsk->tgid == audit_pid) | |
549 | return AUDIT_DISABLED; | |
550 | ||
551 | rcu_read_lock(); | |
552 | for (i = 0; i < ctx->name_count; i++) { | |
553 | int word = AUDIT_WORD(ctx->major); | |
554 | int bit = AUDIT_BIT(ctx->major); | |
555 | struct audit_names *n = &ctx->names[i]; | |
556 | int h = audit_hash_ino((u32)n->ino); | |
557 | struct list_head *list = &audit_inode_hash[h]; | |
558 | ||
559 | if (list_empty(list)) | |
560 | continue; | |
561 | ||
562 | list_for_each_entry_rcu(e, list, list) { | |
563 | if ((e->rule.mask[word] & bit) == bit && | |
564 | audit_filter_rules(tsk, &e->rule, ctx, n, &state)) { | |
b63862f4 DK |
565 | rcu_read_unlock(); |
566 | return state; | |
567 | } | |
0f45aa18 DW |
568 | } |
569 | } | |
570 | rcu_read_unlock(); | |
1da177e4 | 571 | return AUDIT_BUILD_CONTEXT; |
0f45aa18 DW |
572 | } |
573 | ||
f368c07d AG |
574 | void audit_set_auditable(struct audit_context *ctx) |
575 | { | |
576 | ctx->auditable = 1; | |
577 | } | |
578 | ||
1da177e4 LT |
579 | static inline struct audit_context *audit_get_context(struct task_struct *tsk, |
580 | int return_valid, | |
581 | int return_code) | |
582 | { | |
583 | struct audit_context *context = tsk->audit_context; | |
584 | ||
585 | if (likely(!context)) | |
586 | return NULL; | |
587 | context->return_valid = return_valid; | |
588 | context->return_code = return_code; | |
589 | ||
d51374ad | 590 | if (context->in_syscall && !context->dummy && !context->auditable) { |
1da177e4 | 591 | enum audit_state state; |
f368c07d | 592 | |
0f45aa18 | 593 | state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_EXIT]); |
f368c07d AG |
594 | if (state == AUDIT_RECORD_CONTEXT) { |
595 | context->auditable = 1; | |
596 | goto get_context; | |
597 | } | |
598 | ||
599 | state = audit_filter_inodes(tsk, context); | |
1da177e4 LT |
600 | if (state == AUDIT_RECORD_CONTEXT) |
601 | context->auditable = 1; | |
f368c07d | 602 | |
1da177e4 LT |
603 | } |
604 | ||
f368c07d | 605 | get_context: |
3f2792ff | 606 | |
1da177e4 LT |
607 | tsk->audit_context = NULL; |
608 | return context; | |
609 | } | |
610 | ||
611 | static inline void audit_free_names(struct audit_context *context) | |
612 | { | |
613 | int i; | |
614 | ||
615 | #if AUDIT_DEBUG == 2 | |
616 | if (context->auditable | |
617 | ||context->put_count + context->ino_count != context->name_count) { | |
73241ccc | 618 | printk(KERN_ERR "%s:%d(:%d): major=%d in_syscall=%d" |
1da177e4 LT |
619 | " name_count=%d put_count=%d" |
620 | " ino_count=%d [NOT freeing]\n", | |
73241ccc | 621 | __FILE__, __LINE__, |
1da177e4 LT |
622 | context->serial, context->major, context->in_syscall, |
623 | context->name_count, context->put_count, | |
624 | context->ino_count); | |
8c8570fb | 625 | for (i = 0; i < context->name_count; i++) { |
1da177e4 LT |
626 | printk(KERN_ERR "names[%d] = %p = %s\n", i, |
627 | context->names[i].name, | |
73241ccc | 628 | context->names[i].name ?: "(null)"); |
8c8570fb | 629 | } |
1da177e4 LT |
630 | dump_stack(); |
631 | return; | |
632 | } | |
633 | #endif | |
634 | #if AUDIT_DEBUG | |
635 | context->put_count = 0; | |
636 | context->ino_count = 0; | |
637 | #endif | |
638 | ||
8c8570fb | 639 | for (i = 0; i < context->name_count; i++) { |
9c937dcc | 640 | if (context->names[i].name && context->names[i].name_put) |
1da177e4 | 641 | __putname(context->names[i].name); |
8c8570fb | 642 | } |
1da177e4 | 643 | context->name_count = 0; |
8f37d47c DW |
644 | if (context->pwd) |
645 | dput(context->pwd); | |
646 | if (context->pwdmnt) | |
647 | mntput(context->pwdmnt); | |
648 | context->pwd = NULL; | |
649 | context->pwdmnt = NULL; | |
1da177e4 LT |
650 | } |
651 | ||
652 | static inline void audit_free_aux(struct audit_context *context) | |
653 | { | |
654 | struct audit_aux_data *aux; | |
655 | ||
656 | while ((aux = context->aux)) { | |
01116105 SS |
657 | if (aux->type == AUDIT_AVC_PATH) { |
658 | struct audit_aux_data_path *axi = (void *)aux; | |
659 | dput(axi->dentry); | |
660 | mntput(axi->mnt); | |
661 | } | |
8c8570fb | 662 | |
1da177e4 LT |
663 | context->aux = aux->next; |
664 | kfree(aux); | |
665 | } | |
e54dc243 AG |
666 | while ((aux = context->aux_pids)) { |
667 | context->aux_pids = aux->next; | |
668 | kfree(aux); | |
669 | } | |
1da177e4 LT |
670 | } |
671 | ||
672 | static inline void audit_zero_context(struct audit_context *context, | |
673 | enum audit_state state) | |
674 | { | |
675 | uid_t loginuid = context->loginuid; | |
676 | ||
677 | memset(context, 0, sizeof(*context)); | |
678 | context->state = state; | |
679 | context->loginuid = loginuid; | |
680 | } | |
681 | ||
682 | static inline struct audit_context *audit_alloc_context(enum audit_state state) | |
683 | { | |
684 | struct audit_context *context; | |
685 | ||
686 | if (!(context = kmalloc(sizeof(*context), GFP_KERNEL))) | |
687 | return NULL; | |
688 | audit_zero_context(context, state); | |
689 | return context; | |
690 | } | |
691 | ||
b0dd25a8 RD |
692 | /** |
693 | * audit_alloc - allocate an audit context block for a task | |
694 | * @tsk: task | |
695 | * | |
696 | * Filter on the task information and allocate a per-task audit context | |
1da177e4 LT |
697 | * if necessary. Doing so turns on system call auditing for the |
698 | * specified task. This is called from copy_process, so no lock is | |
b0dd25a8 RD |
699 | * needed. |
700 | */ | |
1da177e4 LT |
701 | int audit_alloc(struct task_struct *tsk) |
702 | { | |
703 | struct audit_context *context; | |
704 | enum audit_state state; | |
705 | ||
706 | if (likely(!audit_enabled)) | |
707 | return 0; /* Return if not auditing. */ | |
708 | ||
709 | state = audit_filter_task(tsk); | |
710 | if (likely(state == AUDIT_DISABLED)) | |
711 | return 0; | |
712 | ||
713 | if (!(context = audit_alloc_context(state))) { | |
714 | audit_log_lost("out of memory in audit_alloc"); | |
715 | return -ENOMEM; | |
716 | } | |
717 | ||
718 | /* Preserve login uid */ | |
719 | context->loginuid = -1; | |
720 | if (current->audit_context) | |
721 | context->loginuid = current->audit_context->loginuid; | |
722 | ||
723 | tsk->audit_context = context; | |
724 | set_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT); | |
725 | return 0; | |
726 | } | |
727 | ||
728 | static inline void audit_free_context(struct audit_context *context) | |
729 | { | |
730 | struct audit_context *previous; | |
731 | int count = 0; | |
732 | ||
733 | do { | |
734 | previous = context->previous; | |
735 | if (previous || (count && count < 10)) { | |
736 | ++count; | |
737 | printk(KERN_ERR "audit(:%d): major=%d name_count=%d:" | |
738 | " freeing multiple contexts (%d)\n", | |
739 | context->serial, context->major, | |
740 | context->name_count, count); | |
741 | } | |
742 | audit_free_names(context); | |
743 | audit_free_aux(context); | |
5adc8a6a | 744 | kfree(context->filterkey); |
1da177e4 LT |
745 | kfree(context); |
746 | context = previous; | |
747 | } while (context); | |
748 | if (count >= 10) | |
749 | printk(KERN_ERR "audit: freed %d contexts\n", count); | |
750 | } | |
751 | ||
161a09e7 | 752 | void audit_log_task_context(struct audit_buffer *ab) |
8c8570fb DK |
753 | { |
754 | char *ctx = NULL; | |
c4823bce AV |
755 | unsigned len; |
756 | int error; | |
757 | u32 sid; | |
758 | ||
759 | selinux_get_task_sid(current, &sid); | |
760 | if (!sid) | |
761 | return; | |
8c8570fb | 762 | |
c4823bce AV |
763 | error = selinux_sid_to_string(sid, &ctx, &len); |
764 | if (error) { | |
765 | if (error != -EINVAL) | |
8c8570fb DK |
766 | goto error_path; |
767 | return; | |
768 | } | |
769 | ||
8c8570fb | 770 | audit_log_format(ab, " subj=%s", ctx); |
c4823bce | 771 | kfree(ctx); |
7306a0b9 | 772 | return; |
8c8570fb DK |
773 | |
774 | error_path: | |
7306a0b9 | 775 | audit_panic("error in audit_log_task_context"); |
8c8570fb DK |
776 | return; |
777 | } | |
778 | ||
161a09e7 JL |
779 | EXPORT_SYMBOL(audit_log_task_context); |
780 | ||
e495149b | 781 | static void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk) |
219f0817 | 782 | { |
45d9bb0e AV |
783 | char name[sizeof(tsk->comm)]; |
784 | struct mm_struct *mm = tsk->mm; | |
219f0817 SS |
785 | struct vm_area_struct *vma; |
786 | ||
e495149b AV |
787 | /* tsk == current */ |
788 | ||
45d9bb0e | 789 | get_task_comm(name, tsk); |
99e45eea DW |
790 | audit_log_format(ab, " comm="); |
791 | audit_log_untrustedstring(ab, name); | |
219f0817 | 792 | |
e495149b AV |
793 | if (mm) { |
794 | down_read(&mm->mmap_sem); | |
795 | vma = mm->mmap; | |
796 | while (vma) { | |
797 | if ((vma->vm_flags & VM_EXECUTABLE) && | |
798 | vma->vm_file) { | |
799 | audit_log_d_path(ab, "exe=", | |
a7a005fd JS |
800 | vma->vm_file->f_path.dentry, |
801 | vma->vm_file->f_path.mnt); | |
e495149b AV |
802 | break; |
803 | } | |
804 | vma = vma->vm_next; | |
219f0817 | 805 | } |
e495149b | 806 | up_read(&mm->mmap_sem); |
219f0817 | 807 | } |
e495149b | 808 | audit_log_task_context(ab); |
219f0817 SS |
809 | } |
810 | ||
e54dc243 AG |
811 | static int audit_log_pid_context(struct audit_context *context, pid_t pid, |
812 | u32 sid) | |
813 | { | |
814 | struct audit_buffer *ab; | |
815 | char *s = NULL; | |
816 | u32 len; | |
817 | int rc = 0; | |
818 | ||
819 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID); | |
820 | if (!ab) | |
821 | return 1; | |
822 | ||
823 | if (selinux_sid_to_string(sid, &s, &len)) { | |
824 | audit_log_format(ab, "opid=%d obj=(none)", pid); | |
825 | rc = 1; | |
826 | } else | |
827 | audit_log_format(ab, "opid=%d obj=%s", pid, s); | |
828 | audit_log_end(ab); | |
829 | kfree(s); | |
830 | ||
831 | return rc; | |
832 | } | |
833 | ||
e495149b | 834 | static void audit_log_exit(struct audit_context *context, struct task_struct *tsk) |
1da177e4 | 835 | { |
9c7aa6aa | 836 | int i, call_panic = 0; |
1da177e4 | 837 | struct audit_buffer *ab; |
7551ced3 | 838 | struct audit_aux_data *aux; |
a6c043a8 | 839 | const char *tty; |
1da177e4 | 840 | |
e495149b | 841 | /* tsk == current */ |
3f2792ff | 842 | context->pid = tsk->pid; |
419c58f1 AV |
843 | if (!context->ppid) |
844 | context->ppid = sys_getppid(); | |
3f2792ff AV |
845 | context->uid = tsk->uid; |
846 | context->gid = tsk->gid; | |
847 | context->euid = tsk->euid; | |
848 | context->suid = tsk->suid; | |
849 | context->fsuid = tsk->fsuid; | |
850 | context->egid = tsk->egid; | |
851 | context->sgid = tsk->sgid; | |
852 | context->fsgid = tsk->fsgid; | |
853 | context->personality = tsk->personality; | |
e495149b AV |
854 | |
855 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_SYSCALL); | |
1da177e4 LT |
856 | if (!ab) |
857 | return; /* audit_panic has been called */ | |
bccf6ae0 DW |
858 | audit_log_format(ab, "arch=%x syscall=%d", |
859 | context->arch, context->major); | |
1da177e4 LT |
860 | if (context->personality != PER_LINUX) |
861 | audit_log_format(ab, " per=%lx", context->personality); | |
862 | if (context->return_valid) | |
2fd6f58b | 863 | audit_log_format(ab, " success=%s exit=%ld", |
864 | (context->return_valid==AUDITSC_SUCCESS)?"yes":"no", | |
865 | context->return_code); | |
eb84a20e AC |
866 | |
867 | mutex_lock(&tty_mutex); | |
24ec839c | 868 | read_lock(&tasklist_lock); |
45d9bb0e AV |
869 | if (tsk->signal && tsk->signal->tty && tsk->signal->tty->name) |
870 | tty = tsk->signal->tty->name; | |
a6c043a8 SG |
871 | else |
872 | tty = "(none)"; | |
24ec839c | 873 | read_unlock(&tasklist_lock); |
1da177e4 LT |
874 | audit_log_format(ab, |
875 | " a0=%lx a1=%lx a2=%lx a3=%lx items=%d" | |
f46038ff | 876 | " ppid=%d pid=%d auid=%u uid=%u gid=%u" |
326e9c8b | 877 | " euid=%u suid=%u fsuid=%u" |
a6c043a8 | 878 | " egid=%u sgid=%u fsgid=%u tty=%s", |
1da177e4 LT |
879 | context->argv[0], |
880 | context->argv[1], | |
881 | context->argv[2], | |
882 | context->argv[3], | |
883 | context->name_count, | |
f46038ff | 884 | context->ppid, |
1da177e4 LT |
885 | context->pid, |
886 | context->loginuid, | |
887 | context->uid, | |
888 | context->gid, | |
889 | context->euid, context->suid, context->fsuid, | |
a6c043a8 | 890 | context->egid, context->sgid, context->fsgid, tty); |
eb84a20e AC |
891 | |
892 | mutex_unlock(&tty_mutex); | |
893 | ||
e495149b | 894 | audit_log_task_info(ab, tsk); |
5adc8a6a AG |
895 | if (context->filterkey) { |
896 | audit_log_format(ab, " key="); | |
897 | audit_log_untrustedstring(ab, context->filterkey); | |
898 | } else | |
899 | audit_log_format(ab, " key=(null)"); | |
1da177e4 | 900 | audit_log_end(ab); |
1da177e4 | 901 | |
7551ced3 | 902 | for (aux = context->aux; aux; aux = aux->next) { |
c0404993 | 903 | |
e495149b | 904 | ab = audit_log_start(context, GFP_KERNEL, aux->type); |
1da177e4 LT |
905 | if (!ab) |
906 | continue; /* audit_panic has been called */ | |
907 | ||
1da177e4 | 908 | switch (aux->type) { |
20ca73bc GW |
909 | case AUDIT_MQ_OPEN: { |
910 | struct audit_aux_data_mq_open *axi = (void *)aux; | |
911 | audit_log_format(ab, | |
912 | "oflag=0x%x mode=%#o mq_flags=0x%lx mq_maxmsg=%ld " | |
913 | "mq_msgsize=%ld mq_curmsgs=%ld", | |
914 | axi->oflag, axi->mode, axi->attr.mq_flags, | |
915 | axi->attr.mq_maxmsg, axi->attr.mq_msgsize, | |
916 | axi->attr.mq_curmsgs); | |
917 | break; } | |
918 | ||
919 | case AUDIT_MQ_SENDRECV: { | |
920 | struct audit_aux_data_mq_sendrecv *axi = (void *)aux; | |
921 | audit_log_format(ab, | |
922 | "mqdes=%d msg_len=%zd msg_prio=%u " | |
923 | "abs_timeout_sec=%ld abs_timeout_nsec=%ld", | |
924 | axi->mqdes, axi->msg_len, axi->msg_prio, | |
925 | axi->abs_timeout.tv_sec, axi->abs_timeout.tv_nsec); | |
926 | break; } | |
927 | ||
928 | case AUDIT_MQ_NOTIFY: { | |
929 | struct audit_aux_data_mq_notify *axi = (void *)aux; | |
930 | audit_log_format(ab, | |
931 | "mqdes=%d sigev_signo=%d", | |
932 | axi->mqdes, | |
933 | axi->notification.sigev_signo); | |
934 | break; } | |
935 | ||
936 | case AUDIT_MQ_GETSETATTR: { | |
937 | struct audit_aux_data_mq_getsetattr *axi = (void *)aux; | |
938 | audit_log_format(ab, | |
939 | "mqdes=%d mq_flags=0x%lx mq_maxmsg=%ld mq_msgsize=%ld " | |
940 | "mq_curmsgs=%ld ", | |
941 | axi->mqdes, | |
942 | axi->mqstat.mq_flags, axi->mqstat.mq_maxmsg, | |
943 | axi->mqstat.mq_msgsize, axi->mqstat.mq_curmsgs); | |
944 | break; } | |
945 | ||
c0404993 | 946 | case AUDIT_IPC: { |
1da177e4 LT |
947 | struct audit_aux_data_ipcctl *axi = (void *)aux; |
948 | audit_log_format(ab, | |
ac03221a LK |
949 | "ouid=%u ogid=%u mode=%x", |
950 | axi->uid, axi->gid, axi->mode); | |
9c7aa6aa SG |
951 | if (axi->osid != 0) { |
952 | char *ctx = NULL; | |
953 | u32 len; | |
1a70cd40 | 954 | if (selinux_sid_to_string( |
9c7aa6aa | 955 | axi->osid, &ctx, &len)) { |
ce29b682 | 956 | audit_log_format(ab, " osid=%u", |
9c7aa6aa SG |
957 | axi->osid); |
958 | call_panic = 1; | |
959 | } else | |
960 | audit_log_format(ab, " obj=%s", ctx); | |
961 | kfree(ctx); | |
962 | } | |
3ec3b2fb DW |
963 | break; } |
964 | ||
073115d6 SG |
965 | case AUDIT_IPC_SET_PERM: { |
966 | struct audit_aux_data_ipcctl *axi = (void *)aux; | |
967 | audit_log_format(ab, | |
ac03221a | 968 | "qbytes=%lx ouid=%u ogid=%u mode=%x", |
073115d6 | 969 | axi->qbytes, axi->uid, axi->gid, axi->mode); |
073115d6 | 970 | break; } |
ac03221a | 971 | |
473ae30b AV |
972 | case AUDIT_EXECVE: { |
973 | struct audit_aux_data_execve *axi = (void *)aux; | |
974 | int i; | |
975 | const char *p; | |
976 | for (i = 0, p = axi->mem; i < axi->argc; i++) { | |
977 | audit_log_format(ab, "a%d=", i); | |
978 | p = audit_log_untrustedstring(ab, p); | |
979 | audit_log_format(ab, "\n"); | |
980 | } | |
981 | break; } | |
073115d6 | 982 | |
3ec3b2fb DW |
983 | case AUDIT_SOCKETCALL: { |
984 | int i; | |
985 | struct audit_aux_data_socketcall *axs = (void *)aux; | |
986 | audit_log_format(ab, "nargs=%d", axs->nargs); | |
987 | for (i=0; i<axs->nargs; i++) | |
988 | audit_log_format(ab, " a%d=%lx", i, axs->args[i]); | |
989 | break; } | |
990 | ||
991 | case AUDIT_SOCKADDR: { | |
992 | struct audit_aux_data_sockaddr *axs = (void *)aux; | |
993 | ||
994 | audit_log_format(ab, "saddr="); | |
995 | audit_log_hex(ab, axs->a, axs->len); | |
996 | break; } | |
01116105 SS |
997 | |
998 | case AUDIT_AVC_PATH: { | |
999 | struct audit_aux_data_path *axi = (void *)aux; | |
1000 | audit_log_d_path(ab, "path=", axi->dentry, axi->mnt); | |
01116105 SS |
1001 | break; } |
1002 | ||
db349509 AV |
1003 | case AUDIT_FD_PAIR: { |
1004 | struct audit_aux_data_fd_pair *axs = (void *)aux; | |
1005 | audit_log_format(ab, "fd0=%d fd1=%d", axs->fd[0], axs->fd[1]); | |
1006 | break; } | |
1007 | ||
1da177e4 LT |
1008 | } |
1009 | audit_log_end(ab); | |
1da177e4 LT |
1010 | } |
1011 | ||
e54dc243 AG |
1012 | for (aux = context->aux_pids; aux; aux = aux->next) { |
1013 | struct audit_aux_data_pids *axs = (void *)aux; | |
1014 | int i; | |
1015 | ||
1016 | for (i = 0; i < axs->pid_count; i++) | |
1017 | if (audit_log_pid_context(context, axs->target_pid[i], | |
1018 | axs->target_sid[i])) | |
1019 | call_panic = 1; | |
a5cb013d AV |
1020 | } |
1021 | ||
e54dc243 AG |
1022 | if (context->target_pid && |
1023 | audit_log_pid_context(context, context->target_pid, | |
1024 | context->target_sid)) | |
1025 | call_panic = 1; | |
1026 | ||
8f37d47c | 1027 | if (context->pwd && context->pwdmnt) { |
e495149b | 1028 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD); |
8f37d47c DW |
1029 | if (ab) { |
1030 | audit_log_d_path(ab, "cwd=", context->pwd, context->pwdmnt); | |
1031 | audit_log_end(ab); | |
1032 | } | |
1033 | } | |
1da177e4 | 1034 | for (i = 0; i < context->name_count; i++) { |
9c937dcc | 1035 | struct audit_names *n = &context->names[i]; |
73241ccc | 1036 | |
e495149b | 1037 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_PATH); |
1da177e4 LT |
1038 | if (!ab) |
1039 | continue; /* audit_panic has been called */ | |
8f37d47c | 1040 | |
1da177e4 | 1041 | audit_log_format(ab, "item=%d", i); |
73241ccc | 1042 | |
9c937dcc AG |
1043 | if (n->name) { |
1044 | switch(n->name_len) { | |
1045 | case AUDIT_NAME_FULL: | |
1046 | /* log the full path */ | |
1047 | audit_log_format(ab, " name="); | |
1048 | audit_log_untrustedstring(ab, n->name); | |
1049 | break; | |
1050 | case 0: | |
1051 | /* name was specified as a relative path and the | |
1052 | * directory component is the cwd */ | |
1053 | audit_log_d_path(ab, " name=", context->pwd, | |
1054 | context->pwdmnt); | |
1055 | break; | |
1056 | default: | |
1057 | /* log the name's directory component */ | |
1058 | audit_log_format(ab, " name="); | |
1059 | audit_log_n_untrustedstring(ab, n->name_len, | |
1060 | n->name); | |
1061 | } | |
1062 | } else | |
1063 | audit_log_format(ab, " name=(null)"); | |
1064 | ||
1065 | if (n->ino != (unsigned long)-1) { | |
1066 | audit_log_format(ab, " inode=%lu" | |
1067 | " dev=%02x:%02x mode=%#o" | |
1068 | " ouid=%u ogid=%u rdev=%02x:%02x", | |
1069 | n->ino, | |
1070 | MAJOR(n->dev), | |
1071 | MINOR(n->dev), | |
1072 | n->mode, | |
1073 | n->uid, | |
1074 | n->gid, | |
1075 | MAJOR(n->rdev), | |
1076 | MINOR(n->rdev)); | |
1077 | } | |
1078 | if (n->osid != 0) { | |
1b50eed9 SG |
1079 | char *ctx = NULL; |
1080 | u32 len; | |
1a70cd40 | 1081 | if (selinux_sid_to_string( |
9c937dcc AG |
1082 | n->osid, &ctx, &len)) { |
1083 | audit_log_format(ab, " osid=%u", n->osid); | |
9c7aa6aa | 1084 | call_panic = 2; |
1b50eed9 SG |
1085 | } else |
1086 | audit_log_format(ab, " obj=%s", ctx); | |
1087 | kfree(ctx); | |
8c8570fb DK |
1088 | } |
1089 | ||
1da177e4 LT |
1090 | audit_log_end(ab); |
1091 | } | |
9c7aa6aa SG |
1092 | if (call_panic) |
1093 | audit_panic("error converting sid to string"); | |
1da177e4 LT |
1094 | } |
1095 | ||
b0dd25a8 RD |
1096 | /** |
1097 | * audit_free - free a per-task audit context | |
1098 | * @tsk: task whose audit context block to free | |
1099 | * | |
fa84cb93 | 1100 | * Called from copy_process and do_exit |
b0dd25a8 | 1101 | */ |
1da177e4 LT |
1102 | void audit_free(struct task_struct *tsk) |
1103 | { | |
1104 | struct audit_context *context; | |
1105 | ||
1da177e4 | 1106 | context = audit_get_context(tsk, 0, 0); |
1da177e4 LT |
1107 | if (likely(!context)) |
1108 | return; | |
1109 | ||
1110 | /* Check for system calls that do not go through the exit | |
f5561964 DW |
1111 | * function (e.g., exit_group), then free context block. |
1112 | * We use GFP_ATOMIC here because we might be doing this | |
1113 | * in the context of the idle thread */ | |
e495149b | 1114 | /* that can happen only if we are called from do_exit() */ |
f7056d64 | 1115 | if (context->in_syscall && context->auditable) |
e495149b | 1116 | audit_log_exit(context, tsk); |
1da177e4 LT |
1117 | |
1118 | audit_free_context(context); | |
1119 | } | |
1120 | ||
b0dd25a8 RD |
1121 | /** |
1122 | * audit_syscall_entry - fill in an audit record at syscall entry | |
1123 | * @tsk: task being audited | |
1124 | * @arch: architecture type | |
1125 | * @major: major syscall type (function) | |
1126 | * @a1: additional syscall register 1 | |
1127 | * @a2: additional syscall register 2 | |
1128 | * @a3: additional syscall register 3 | |
1129 | * @a4: additional syscall register 4 | |
1130 | * | |
1131 | * Fill in audit context at syscall entry. This only happens if the | |
1da177e4 LT |
1132 | * audit context was created when the task was created and the state or |
1133 | * filters demand the audit context be built. If the state from the | |
1134 | * per-task filter or from the per-syscall filter is AUDIT_RECORD_CONTEXT, | |
1135 | * then the record will be written at syscall exit time (otherwise, it | |
1136 | * will only be written if another part of the kernel requests that it | |
b0dd25a8 RD |
1137 | * be written). |
1138 | */ | |
5411be59 | 1139 | void audit_syscall_entry(int arch, int major, |
1da177e4 LT |
1140 | unsigned long a1, unsigned long a2, |
1141 | unsigned long a3, unsigned long a4) | |
1142 | { | |
5411be59 | 1143 | struct task_struct *tsk = current; |
1da177e4 LT |
1144 | struct audit_context *context = tsk->audit_context; |
1145 | enum audit_state state; | |
1146 | ||
1147 | BUG_ON(!context); | |
1148 | ||
b0dd25a8 RD |
1149 | /* |
1150 | * This happens only on certain architectures that make system | |
1da177e4 LT |
1151 | * calls in kernel_thread via the entry.S interface, instead of |
1152 | * with direct calls. (If you are porting to a new | |
1153 | * architecture, hitting this condition can indicate that you | |
1154 | * got the _exit/_leave calls backward in entry.S.) | |
1155 | * | |
1156 | * i386 no | |
1157 | * x86_64 no | |
2ef9481e | 1158 | * ppc64 yes (see arch/powerpc/platforms/iseries/misc.S) |
1da177e4 LT |
1159 | * |
1160 | * This also happens with vm86 emulation in a non-nested manner | |
1161 | * (entries without exits), so this case must be caught. | |
1162 | */ | |
1163 | if (context->in_syscall) { | |
1164 | struct audit_context *newctx; | |
1165 | ||
1da177e4 LT |
1166 | #if AUDIT_DEBUG |
1167 | printk(KERN_ERR | |
1168 | "audit(:%d) pid=%d in syscall=%d;" | |
1169 | " entering syscall=%d\n", | |
1170 | context->serial, tsk->pid, context->major, major); | |
1171 | #endif | |
1172 | newctx = audit_alloc_context(context->state); | |
1173 | if (newctx) { | |
1174 | newctx->previous = context; | |
1175 | context = newctx; | |
1176 | tsk->audit_context = newctx; | |
1177 | } else { | |
1178 | /* If we can't alloc a new context, the best we | |
1179 | * can do is to leak memory (any pending putname | |
1180 | * will be lost). The only other alternative is | |
1181 | * to abandon auditing. */ | |
1182 | audit_zero_context(context, context->state); | |
1183 | } | |
1184 | } | |
1185 | BUG_ON(context->in_syscall || context->name_count); | |
1186 | ||
1187 | if (!audit_enabled) | |
1188 | return; | |
1189 | ||
2fd6f58b | 1190 | context->arch = arch; |
1da177e4 LT |
1191 | context->major = major; |
1192 | context->argv[0] = a1; | |
1193 | context->argv[1] = a2; | |
1194 | context->argv[2] = a3; | |
1195 | context->argv[3] = a4; | |
1196 | ||
1197 | state = context->state; | |
d51374ad AV |
1198 | context->dummy = !audit_n_rules; |
1199 | if (!context->dummy && (state == AUDIT_SETUP_CONTEXT || state == AUDIT_BUILD_CONTEXT)) | |
0f45aa18 | 1200 | state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_ENTRY]); |
1da177e4 LT |
1201 | if (likely(state == AUDIT_DISABLED)) |
1202 | return; | |
1203 | ||
ce625a80 | 1204 | context->serial = 0; |
1da177e4 LT |
1205 | context->ctime = CURRENT_TIME; |
1206 | context->in_syscall = 1; | |
1207 | context->auditable = !!(state == AUDIT_RECORD_CONTEXT); | |
419c58f1 | 1208 | context->ppid = 0; |
1da177e4 LT |
1209 | } |
1210 | ||
b0dd25a8 RD |
1211 | /** |
1212 | * audit_syscall_exit - deallocate audit context after a system call | |
1213 | * @tsk: task being audited | |
1214 | * @valid: success/failure flag | |
1215 | * @return_code: syscall return value | |
1216 | * | |
1217 | * Tear down after system call. If the audit context has been marked as | |
1da177e4 LT |
1218 | * auditable (either because of the AUDIT_RECORD_CONTEXT state from |
1219 | * filtering, or because some other part of the kernel write an audit | |
1220 | * message), then write out the syscall information. In call cases, | |
b0dd25a8 RD |
1221 | * free the names stored from getname(). |
1222 | */ | |
5411be59 | 1223 | void audit_syscall_exit(int valid, long return_code) |
1da177e4 | 1224 | { |
5411be59 | 1225 | struct task_struct *tsk = current; |
1da177e4 LT |
1226 | struct audit_context *context; |
1227 | ||
2fd6f58b | 1228 | context = audit_get_context(tsk, valid, return_code); |
1da177e4 | 1229 | |
1da177e4 | 1230 | if (likely(!context)) |
97e94c45 | 1231 | return; |
1da177e4 | 1232 | |
f7056d64 | 1233 | if (context->in_syscall && context->auditable) |
e495149b | 1234 | audit_log_exit(context, tsk); |
1da177e4 LT |
1235 | |
1236 | context->in_syscall = 0; | |
1237 | context->auditable = 0; | |
2fd6f58b | 1238 | |
1da177e4 LT |
1239 | if (context->previous) { |
1240 | struct audit_context *new_context = context->previous; | |
1241 | context->previous = NULL; | |
1242 | audit_free_context(context); | |
1243 | tsk->audit_context = new_context; | |
1244 | } else { | |
1245 | audit_free_names(context); | |
1246 | audit_free_aux(context); | |
e54dc243 AG |
1247 | context->aux = NULL; |
1248 | context->aux_pids = NULL; | |
a5cb013d | 1249 | context->target_pid = 0; |
e54dc243 | 1250 | context->target_sid = 0; |
5adc8a6a AG |
1251 | kfree(context->filterkey); |
1252 | context->filterkey = NULL; | |
1da177e4 LT |
1253 | tsk->audit_context = context; |
1254 | } | |
1da177e4 LT |
1255 | } |
1256 | ||
b0dd25a8 RD |
1257 | /** |
1258 | * audit_getname - add a name to the list | |
1259 | * @name: name to add | |
1260 | * | |
1261 | * Add a name to the list of audit names for this context. | |
1262 | * Called from fs/namei.c:getname(). | |
1263 | */ | |
d8945bb5 | 1264 | void __audit_getname(const char *name) |
1da177e4 LT |
1265 | { |
1266 | struct audit_context *context = current->audit_context; | |
1267 | ||
d8945bb5 | 1268 | if (IS_ERR(name) || !name) |
1da177e4 LT |
1269 | return; |
1270 | ||
1271 | if (!context->in_syscall) { | |
1272 | #if AUDIT_DEBUG == 2 | |
1273 | printk(KERN_ERR "%s:%d(:%d): ignoring getname(%p)\n", | |
1274 | __FILE__, __LINE__, context->serial, name); | |
1275 | dump_stack(); | |
1276 | #endif | |
1277 | return; | |
1278 | } | |
1279 | BUG_ON(context->name_count >= AUDIT_NAMES); | |
1280 | context->names[context->name_count].name = name; | |
9c937dcc AG |
1281 | context->names[context->name_count].name_len = AUDIT_NAME_FULL; |
1282 | context->names[context->name_count].name_put = 1; | |
1da177e4 | 1283 | context->names[context->name_count].ino = (unsigned long)-1; |
e41e8bde | 1284 | context->names[context->name_count].osid = 0; |
1da177e4 | 1285 | ++context->name_count; |
8f37d47c DW |
1286 | if (!context->pwd) { |
1287 | read_lock(¤t->fs->lock); | |
1288 | context->pwd = dget(current->fs->pwd); | |
1289 | context->pwdmnt = mntget(current->fs->pwdmnt); | |
1290 | read_unlock(¤t->fs->lock); | |
1291 | } | |
1292 | ||
1da177e4 LT |
1293 | } |
1294 | ||
b0dd25a8 RD |
1295 | /* audit_putname - intercept a putname request |
1296 | * @name: name to intercept and delay for putname | |
1297 | * | |
1298 | * If we have stored the name from getname in the audit context, | |
1299 | * then we delay the putname until syscall exit. | |
1300 | * Called from include/linux/fs.h:putname(). | |
1301 | */ | |
1da177e4 LT |
1302 | void audit_putname(const char *name) |
1303 | { | |
1304 | struct audit_context *context = current->audit_context; | |
1305 | ||
1306 | BUG_ON(!context); | |
1307 | if (!context->in_syscall) { | |
1308 | #if AUDIT_DEBUG == 2 | |
1309 | printk(KERN_ERR "%s:%d(:%d): __putname(%p)\n", | |
1310 | __FILE__, __LINE__, context->serial, name); | |
1311 | if (context->name_count) { | |
1312 | int i; | |
1313 | for (i = 0; i < context->name_count; i++) | |
1314 | printk(KERN_ERR "name[%d] = %p = %s\n", i, | |
1315 | context->names[i].name, | |
73241ccc | 1316 | context->names[i].name ?: "(null)"); |
1da177e4 LT |
1317 | } |
1318 | #endif | |
1319 | __putname(name); | |
1320 | } | |
1321 | #if AUDIT_DEBUG | |
1322 | else { | |
1323 | ++context->put_count; | |
1324 | if (context->put_count > context->name_count) { | |
1325 | printk(KERN_ERR "%s:%d(:%d): major=%d" | |
1326 | " in_syscall=%d putname(%p) name_count=%d" | |
1327 | " put_count=%d\n", | |
1328 | __FILE__, __LINE__, | |
1329 | context->serial, context->major, | |
1330 | context->in_syscall, name, context->name_count, | |
1331 | context->put_count); | |
1332 | dump_stack(); | |
1333 | } | |
1334 | } | |
1335 | #endif | |
1336 | } | |
1337 | ||
5712e88f AG |
1338 | static int audit_inc_name_count(struct audit_context *context, |
1339 | const struct inode *inode) | |
1340 | { | |
1341 | if (context->name_count >= AUDIT_NAMES) { | |
1342 | if (inode) | |
1343 | printk(KERN_DEBUG "name_count maxed, losing inode data: " | |
1344 | "dev=%02x:%02x, inode=%lu", | |
1345 | MAJOR(inode->i_sb->s_dev), | |
1346 | MINOR(inode->i_sb->s_dev), | |
1347 | inode->i_ino); | |
1348 | ||
1349 | else | |
1350 | printk(KERN_DEBUG "name_count maxed, losing inode data"); | |
1351 | return 1; | |
1352 | } | |
1353 | context->name_count++; | |
1354 | #if AUDIT_DEBUG | |
1355 | context->ino_count++; | |
1356 | #endif | |
1357 | return 0; | |
1358 | } | |
1359 | ||
3e2efce0 AG |
1360 | /* Copy inode data into an audit_names. */ |
1361 | static void audit_copy_inode(struct audit_names *name, const struct inode *inode) | |
8c8570fb | 1362 | { |
3e2efce0 AG |
1363 | name->ino = inode->i_ino; |
1364 | name->dev = inode->i_sb->s_dev; | |
1365 | name->mode = inode->i_mode; | |
1366 | name->uid = inode->i_uid; | |
1367 | name->gid = inode->i_gid; | |
1368 | name->rdev = inode->i_rdev; | |
1369 | selinux_get_inode_sid(inode, &name->osid); | |
8c8570fb DK |
1370 | } |
1371 | ||
b0dd25a8 RD |
1372 | /** |
1373 | * audit_inode - store the inode and device from a lookup | |
1374 | * @name: name being audited | |
1375 | * @inode: inode being audited | |
b0dd25a8 RD |
1376 | * |
1377 | * Called from fs/namei.c:path_lookup(). | |
1378 | */ | |
9c937dcc | 1379 | void __audit_inode(const char *name, const struct inode *inode) |
1da177e4 LT |
1380 | { |
1381 | int idx; | |
1382 | struct audit_context *context = current->audit_context; | |
1383 | ||
1384 | if (!context->in_syscall) | |
1385 | return; | |
1386 | if (context->name_count | |
1387 | && context->names[context->name_count-1].name | |
1388 | && context->names[context->name_count-1].name == name) | |
1389 | idx = context->name_count - 1; | |
1390 | else if (context->name_count > 1 | |
1391 | && context->names[context->name_count-2].name | |
1392 | && context->names[context->name_count-2].name == name) | |
1393 | idx = context->name_count - 2; | |
1394 | else { | |
1395 | /* FIXME: how much do we care about inodes that have no | |
1396 | * associated name? */ | |
5712e88f | 1397 | if (audit_inc_name_count(context, inode)) |
1da177e4 | 1398 | return; |
5712e88f | 1399 | idx = context->name_count - 1; |
1da177e4 | 1400 | context->names[idx].name = NULL; |
1da177e4 | 1401 | } |
3e2efce0 | 1402 | audit_copy_inode(&context->names[idx], inode); |
73241ccc AG |
1403 | } |
1404 | ||
1405 | /** | |
1406 | * audit_inode_child - collect inode info for created/removed objects | |
1407 | * @dname: inode's dentry name | |
1408 | * @inode: inode being audited | |
73d3ec5a | 1409 | * @parent: inode of dentry parent |
73241ccc AG |
1410 | * |
1411 | * For syscalls that create or remove filesystem objects, audit_inode | |
1412 | * can only collect information for the filesystem object's parent. | |
1413 | * This call updates the audit context with the child's information. | |
1414 | * Syscalls that create a new filesystem object must be hooked after | |
1415 | * the object is created. Syscalls that remove a filesystem object | |
1416 | * must be hooked prior, in order to capture the target inode during | |
1417 | * unsuccessful attempts. | |
1418 | */ | |
1419 | void __audit_inode_child(const char *dname, const struct inode *inode, | |
73d3ec5a | 1420 | const struct inode *parent) |
73241ccc AG |
1421 | { |
1422 | int idx; | |
1423 | struct audit_context *context = current->audit_context; | |
5712e88f | 1424 | const char *found_parent = NULL, *found_child = NULL; |
9c937dcc | 1425 | int dirlen = 0; |
73241ccc AG |
1426 | |
1427 | if (!context->in_syscall) | |
1428 | return; | |
1429 | ||
1430 | /* determine matching parent */ | |
f368c07d | 1431 | if (!dname) |
5712e88f | 1432 | goto add_names; |
73241ccc | 1433 | |
5712e88f AG |
1434 | /* parent is more likely, look for it first */ |
1435 | for (idx = 0; idx < context->name_count; idx++) { | |
1436 | struct audit_names *n = &context->names[idx]; | |
f368c07d | 1437 | |
5712e88f AG |
1438 | if (!n->name) |
1439 | continue; | |
1440 | ||
1441 | if (n->ino == parent->i_ino && | |
1442 | !audit_compare_dname_path(dname, n->name, &dirlen)) { | |
1443 | n->name_len = dirlen; /* update parent data in place */ | |
1444 | found_parent = n->name; | |
1445 | goto add_names; | |
f368c07d | 1446 | } |
5712e88f | 1447 | } |
73241ccc | 1448 | |
5712e88f AG |
1449 | /* no matching parent, look for matching child */ |
1450 | for (idx = 0; idx < context->name_count; idx++) { | |
1451 | struct audit_names *n = &context->names[idx]; | |
1452 | ||
1453 | if (!n->name) | |
1454 | continue; | |
1455 | ||
1456 | /* strcmp() is the more likely scenario */ | |
1457 | if (!strcmp(dname, n->name) || | |
1458 | !audit_compare_dname_path(dname, n->name, &dirlen)) { | |
1459 | if (inode) | |
1460 | audit_copy_inode(n, inode); | |
1461 | else | |
1462 | n->ino = (unsigned long)-1; | |
1463 | found_child = n->name; | |
1464 | goto add_names; | |
1465 | } | |
ac9910ce | 1466 | } |
5712e88f AG |
1467 | |
1468 | add_names: | |
1469 | if (!found_parent) { | |
1470 | if (audit_inc_name_count(context, parent)) | |
ac9910ce | 1471 | return; |
5712e88f AG |
1472 | idx = context->name_count - 1; |
1473 | context->names[idx].name = NULL; | |
73d3ec5a AG |
1474 | audit_copy_inode(&context->names[idx], parent); |
1475 | } | |
5712e88f AG |
1476 | |
1477 | if (!found_child) { | |
1478 | if (audit_inc_name_count(context, inode)) | |
1479 | return; | |
1480 | idx = context->name_count - 1; | |
1481 | ||
1482 | /* Re-use the name belonging to the slot for a matching parent | |
1483 | * directory. All names for this context are relinquished in | |
1484 | * audit_free_names() */ | |
1485 | if (found_parent) { | |
1486 | context->names[idx].name = found_parent; | |
1487 | context->names[idx].name_len = AUDIT_NAME_FULL; | |
1488 | /* don't call __putname() */ | |
1489 | context->names[idx].name_put = 0; | |
1490 | } else { | |
1491 | context->names[idx].name = NULL; | |
1492 | } | |
1493 | ||
1494 | if (inode) | |
1495 | audit_copy_inode(&context->names[idx], inode); | |
1496 | else | |
1497 | context->names[idx].ino = (unsigned long)-1; | |
1498 | } | |
3e2efce0 AG |
1499 | } |
1500 | ||
b0dd25a8 RD |
1501 | /** |
1502 | * auditsc_get_stamp - get local copies of audit_context values | |
1503 | * @ctx: audit_context for the task | |
1504 | * @t: timespec to store time recorded in the audit_context | |
1505 | * @serial: serial value that is recorded in the audit_context | |
1506 | * | |
1507 | * Also sets the context as auditable. | |
1508 | */ | |
bfb4496e DW |
1509 | void auditsc_get_stamp(struct audit_context *ctx, |
1510 | struct timespec *t, unsigned int *serial) | |
1da177e4 | 1511 | { |
ce625a80 DW |
1512 | if (!ctx->serial) |
1513 | ctx->serial = audit_serial(); | |
bfb4496e DW |
1514 | t->tv_sec = ctx->ctime.tv_sec; |
1515 | t->tv_nsec = ctx->ctime.tv_nsec; | |
1516 | *serial = ctx->serial; | |
1517 | ctx->auditable = 1; | |
1da177e4 LT |
1518 | } |
1519 | ||
b0dd25a8 RD |
1520 | /** |
1521 | * audit_set_loginuid - set a task's audit_context loginuid | |
1522 | * @task: task whose audit context is being modified | |
1523 | * @loginuid: loginuid value | |
1524 | * | |
1525 | * Returns 0. | |
1526 | * | |
1527 | * Called (set) from fs/proc/base.c::proc_loginuid_write(). | |
1528 | */ | |
456be6cd | 1529 | int audit_set_loginuid(struct task_struct *task, uid_t loginuid) |
1da177e4 | 1530 | { |
41757106 SG |
1531 | struct audit_context *context = task->audit_context; |
1532 | ||
1533 | if (context) { | |
1534 | /* Only log if audit is enabled */ | |
1535 | if (context->in_syscall) { | |
1536 | struct audit_buffer *ab; | |
1537 | ||
1538 | ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_LOGIN); | |
1539 | if (ab) { | |
1540 | audit_log_format(ab, "login pid=%d uid=%u " | |
1541 | "old auid=%u new auid=%u", | |
1542 | task->pid, task->uid, | |
1543 | context->loginuid, loginuid); | |
1544 | audit_log_end(ab); | |
1545 | } | |
c0404993 | 1546 | } |
41757106 | 1547 | context->loginuid = loginuid; |
1da177e4 LT |
1548 | } |
1549 | return 0; | |
1550 | } | |
1551 | ||
b0dd25a8 RD |
1552 | /** |
1553 | * audit_get_loginuid - get the loginuid for an audit_context | |
1554 | * @ctx: the audit_context | |
1555 | * | |
1556 | * Returns the context's loginuid or -1 if @ctx is NULL. | |
1557 | */ | |
1da177e4 LT |
1558 | uid_t audit_get_loginuid(struct audit_context *ctx) |
1559 | { | |
1560 | return ctx ? ctx->loginuid : -1; | |
1561 | } | |
1562 | ||
161a09e7 JL |
1563 | EXPORT_SYMBOL(audit_get_loginuid); |
1564 | ||
20ca73bc GW |
1565 | /** |
1566 | * __audit_mq_open - record audit data for a POSIX MQ open | |
1567 | * @oflag: open flag | |
1568 | * @mode: mode bits | |
1569 | * @u_attr: queue attributes | |
1570 | * | |
1571 | * Returns 0 for success or NULL context or < 0 on error. | |
1572 | */ | |
1573 | int __audit_mq_open(int oflag, mode_t mode, struct mq_attr __user *u_attr) | |
1574 | { | |
1575 | struct audit_aux_data_mq_open *ax; | |
1576 | struct audit_context *context = current->audit_context; | |
1577 | ||
1578 | if (!audit_enabled) | |
1579 | return 0; | |
1580 | ||
1581 | if (likely(!context)) | |
1582 | return 0; | |
1583 | ||
1584 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1585 | if (!ax) | |
1586 | return -ENOMEM; | |
1587 | ||
1588 | if (u_attr != NULL) { | |
1589 | if (copy_from_user(&ax->attr, u_attr, sizeof(ax->attr))) { | |
1590 | kfree(ax); | |
1591 | return -EFAULT; | |
1592 | } | |
1593 | } else | |
1594 | memset(&ax->attr, 0, sizeof(ax->attr)); | |
1595 | ||
1596 | ax->oflag = oflag; | |
1597 | ax->mode = mode; | |
1598 | ||
1599 | ax->d.type = AUDIT_MQ_OPEN; | |
1600 | ax->d.next = context->aux; | |
1601 | context->aux = (void *)ax; | |
1602 | return 0; | |
1603 | } | |
1604 | ||
1605 | /** | |
1606 | * __audit_mq_timedsend - record audit data for a POSIX MQ timed send | |
1607 | * @mqdes: MQ descriptor | |
1608 | * @msg_len: Message length | |
1609 | * @msg_prio: Message priority | |
1dbe83c3 | 1610 | * @u_abs_timeout: Message timeout in absolute time |
20ca73bc GW |
1611 | * |
1612 | * Returns 0 for success or NULL context or < 0 on error. | |
1613 | */ | |
1614 | int __audit_mq_timedsend(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, | |
1615 | const struct timespec __user *u_abs_timeout) | |
1616 | { | |
1617 | struct audit_aux_data_mq_sendrecv *ax; | |
1618 | struct audit_context *context = current->audit_context; | |
1619 | ||
1620 | if (!audit_enabled) | |
1621 | return 0; | |
1622 | ||
1623 | if (likely(!context)) | |
1624 | return 0; | |
1625 | ||
1626 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1627 | if (!ax) | |
1628 | return -ENOMEM; | |
1629 | ||
1630 | if (u_abs_timeout != NULL) { | |
1631 | if (copy_from_user(&ax->abs_timeout, u_abs_timeout, sizeof(ax->abs_timeout))) { | |
1632 | kfree(ax); | |
1633 | return -EFAULT; | |
1634 | } | |
1635 | } else | |
1636 | memset(&ax->abs_timeout, 0, sizeof(ax->abs_timeout)); | |
1637 | ||
1638 | ax->mqdes = mqdes; | |
1639 | ax->msg_len = msg_len; | |
1640 | ax->msg_prio = msg_prio; | |
1641 | ||
1642 | ax->d.type = AUDIT_MQ_SENDRECV; | |
1643 | ax->d.next = context->aux; | |
1644 | context->aux = (void *)ax; | |
1645 | return 0; | |
1646 | } | |
1647 | ||
1648 | /** | |
1649 | * __audit_mq_timedreceive - record audit data for a POSIX MQ timed receive | |
1650 | * @mqdes: MQ descriptor | |
1651 | * @msg_len: Message length | |
1dbe83c3 RD |
1652 | * @u_msg_prio: Message priority |
1653 | * @u_abs_timeout: Message timeout in absolute time | |
20ca73bc GW |
1654 | * |
1655 | * Returns 0 for success or NULL context or < 0 on error. | |
1656 | */ | |
1657 | int __audit_mq_timedreceive(mqd_t mqdes, size_t msg_len, | |
1658 | unsigned int __user *u_msg_prio, | |
1659 | const struct timespec __user *u_abs_timeout) | |
1660 | { | |
1661 | struct audit_aux_data_mq_sendrecv *ax; | |
1662 | struct audit_context *context = current->audit_context; | |
1663 | ||
1664 | if (!audit_enabled) | |
1665 | return 0; | |
1666 | ||
1667 | if (likely(!context)) | |
1668 | return 0; | |
1669 | ||
1670 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1671 | if (!ax) | |
1672 | return -ENOMEM; | |
1673 | ||
1674 | if (u_msg_prio != NULL) { | |
1675 | if (get_user(ax->msg_prio, u_msg_prio)) { | |
1676 | kfree(ax); | |
1677 | return -EFAULT; | |
1678 | } | |
1679 | } else | |
1680 | ax->msg_prio = 0; | |
1681 | ||
1682 | if (u_abs_timeout != NULL) { | |
1683 | if (copy_from_user(&ax->abs_timeout, u_abs_timeout, sizeof(ax->abs_timeout))) { | |
1684 | kfree(ax); | |
1685 | return -EFAULT; | |
1686 | } | |
1687 | } else | |
1688 | memset(&ax->abs_timeout, 0, sizeof(ax->abs_timeout)); | |
1689 | ||
1690 | ax->mqdes = mqdes; | |
1691 | ax->msg_len = msg_len; | |
1692 | ||
1693 | ax->d.type = AUDIT_MQ_SENDRECV; | |
1694 | ax->d.next = context->aux; | |
1695 | context->aux = (void *)ax; | |
1696 | return 0; | |
1697 | } | |
1698 | ||
1699 | /** | |
1700 | * __audit_mq_notify - record audit data for a POSIX MQ notify | |
1701 | * @mqdes: MQ descriptor | |
1702 | * @u_notification: Notification event | |
1703 | * | |
1704 | * Returns 0 for success or NULL context or < 0 on error. | |
1705 | */ | |
1706 | ||
1707 | int __audit_mq_notify(mqd_t mqdes, const struct sigevent __user *u_notification) | |
1708 | { | |
1709 | struct audit_aux_data_mq_notify *ax; | |
1710 | struct audit_context *context = current->audit_context; | |
1711 | ||
1712 | if (!audit_enabled) | |
1713 | return 0; | |
1714 | ||
1715 | if (likely(!context)) | |
1716 | return 0; | |
1717 | ||
1718 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1719 | if (!ax) | |
1720 | return -ENOMEM; | |
1721 | ||
1722 | if (u_notification != NULL) { | |
1723 | if (copy_from_user(&ax->notification, u_notification, sizeof(ax->notification))) { | |
1724 | kfree(ax); | |
1725 | return -EFAULT; | |
1726 | } | |
1727 | } else | |
1728 | memset(&ax->notification, 0, sizeof(ax->notification)); | |
1729 | ||
1730 | ax->mqdes = mqdes; | |
1731 | ||
1732 | ax->d.type = AUDIT_MQ_NOTIFY; | |
1733 | ax->d.next = context->aux; | |
1734 | context->aux = (void *)ax; | |
1735 | return 0; | |
1736 | } | |
1737 | ||
1738 | /** | |
1739 | * __audit_mq_getsetattr - record audit data for a POSIX MQ get/set attribute | |
1740 | * @mqdes: MQ descriptor | |
1741 | * @mqstat: MQ flags | |
1742 | * | |
1743 | * Returns 0 for success or NULL context or < 0 on error. | |
1744 | */ | |
1745 | int __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat) | |
1746 | { | |
1747 | struct audit_aux_data_mq_getsetattr *ax; | |
1748 | struct audit_context *context = current->audit_context; | |
1749 | ||
1750 | if (!audit_enabled) | |
1751 | return 0; | |
1752 | ||
1753 | if (likely(!context)) | |
1754 | return 0; | |
1755 | ||
1756 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1757 | if (!ax) | |
1758 | return -ENOMEM; | |
1759 | ||
1760 | ax->mqdes = mqdes; | |
1761 | ax->mqstat = *mqstat; | |
1762 | ||
1763 | ax->d.type = AUDIT_MQ_GETSETATTR; | |
1764 | ax->d.next = context->aux; | |
1765 | context->aux = (void *)ax; | |
1766 | return 0; | |
1767 | } | |
1768 | ||
b0dd25a8 | 1769 | /** |
073115d6 SG |
1770 | * audit_ipc_obj - record audit data for ipc object |
1771 | * @ipcp: ipc permissions | |
1772 | * | |
1773 | * Returns 0 for success or NULL context or < 0 on error. | |
1774 | */ | |
d8945bb5 | 1775 | int __audit_ipc_obj(struct kern_ipc_perm *ipcp) |
073115d6 SG |
1776 | { |
1777 | struct audit_aux_data_ipcctl *ax; | |
1778 | struct audit_context *context = current->audit_context; | |
1779 | ||
073115d6 SG |
1780 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); |
1781 | if (!ax) | |
1782 | return -ENOMEM; | |
1783 | ||
1784 | ax->uid = ipcp->uid; | |
1785 | ax->gid = ipcp->gid; | |
1786 | ax->mode = ipcp->mode; | |
1787 | selinux_get_ipc_sid(ipcp, &ax->osid); | |
1788 | ||
1789 | ax->d.type = AUDIT_IPC; | |
1790 | ax->d.next = context->aux; | |
1791 | context->aux = (void *)ax; | |
1792 | return 0; | |
1793 | } | |
1794 | ||
1795 | /** | |
1796 | * audit_ipc_set_perm - record audit data for new ipc permissions | |
b0dd25a8 RD |
1797 | * @qbytes: msgq bytes |
1798 | * @uid: msgq user id | |
1799 | * @gid: msgq group id | |
1800 | * @mode: msgq mode (permissions) | |
1801 | * | |
1802 | * Returns 0 for success or NULL context or < 0 on error. | |
1803 | */ | |
d8945bb5 | 1804 | int __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode) |
1da177e4 LT |
1805 | { |
1806 | struct audit_aux_data_ipcctl *ax; | |
1807 | struct audit_context *context = current->audit_context; | |
1808 | ||
8c8570fb | 1809 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); |
1da177e4 LT |
1810 | if (!ax) |
1811 | return -ENOMEM; | |
1812 | ||
1813 | ax->qbytes = qbytes; | |
1814 | ax->uid = uid; | |
1815 | ax->gid = gid; | |
1816 | ax->mode = mode; | |
1817 | ||
073115d6 | 1818 | ax->d.type = AUDIT_IPC_SET_PERM; |
1da177e4 LT |
1819 | ax->d.next = context->aux; |
1820 | context->aux = (void *)ax; | |
1821 | return 0; | |
1822 | } | |
c2f0c7c3 | 1823 | |
473ae30b AV |
1824 | int audit_bprm(struct linux_binprm *bprm) |
1825 | { | |
1826 | struct audit_aux_data_execve *ax; | |
1827 | struct audit_context *context = current->audit_context; | |
1828 | unsigned long p, next; | |
1829 | void *to; | |
1830 | ||
5ac3a9c2 | 1831 | if (likely(!audit_enabled || !context || context->dummy)) |
473ae30b AV |
1832 | return 0; |
1833 | ||
1834 | ax = kmalloc(sizeof(*ax) + PAGE_SIZE * MAX_ARG_PAGES - bprm->p, | |
1835 | GFP_KERNEL); | |
1836 | if (!ax) | |
1837 | return -ENOMEM; | |
1838 | ||
1839 | ax->argc = bprm->argc; | |
1840 | ax->envc = bprm->envc; | |
1841 | for (p = bprm->p, to = ax->mem; p < MAX_ARG_PAGES*PAGE_SIZE; p = next) { | |
1842 | struct page *page = bprm->page[p / PAGE_SIZE]; | |
1843 | void *kaddr = kmap(page); | |
1844 | next = (p + PAGE_SIZE) & ~(PAGE_SIZE - 1); | |
1845 | memcpy(to, kaddr + (p & (PAGE_SIZE - 1)), next - p); | |
1846 | to += next - p; | |
1847 | kunmap(page); | |
1848 | } | |
1849 | ||
1850 | ax->d.type = AUDIT_EXECVE; | |
1851 | ax->d.next = context->aux; | |
1852 | context->aux = (void *)ax; | |
1853 | return 0; | |
1854 | } | |
1855 | ||
1856 | ||
b0dd25a8 RD |
1857 | /** |
1858 | * audit_socketcall - record audit data for sys_socketcall | |
1859 | * @nargs: number of args | |
1860 | * @args: args array | |
1861 | * | |
1862 | * Returns 0 for success or NULL context or < 0 on error. | |
1863 | */ | |
3ec3b2fb DW |
1864 | int audit_socketcall(int nargs, unsigned long *args) |
1865 | { | |
1866 | struct audit_aux_data_socketcall *ax; | |
1867 | struct audit_context *context = current->audit_context; | |
1868 | ||
5ac3a9c2 | 1869 | if (likely(!context || context->dummy)) |
3ec3b2fb DW |
1870 | return 0; |
1871 | ||
1872 | ax = kmalloc(sizeof(*ax) + nargs * sizeof(unsigned long), GFP_KERNEL); | |
1873 | if (!ax) | |
1874 | return -ENOMEM; | |
1875 | ||
1876 | ax->nargs = nargs; | |
1877 | memcpy(ax->args, args, nargs * sizeof(unsigned long)); | |
1878 | ||
1879 | ax->d.type = AUDIT_SOCKETCALL; | |
1880 | ax->d.next = context->aux; | |
1881 | context->aux = (void *)ax; | |
1882 | return 0; | |
1883 | } | |
1884 | ||
db349509 AV |
1885 | /** |
1886 | * __audit_fd_pair - record audit data for pipe and socketpair | |
1887 | * @fd1: the first file descriptor | |
1888 | * @fd2: the second file descriptor | |
1889 | * | |
1890 | * Returns 0 for success or NULL context or < 0 on error. | |
1891 | */ | |
1892 | int __audit_fd_pair(int fd1, int fd2) | |
1893 | { | |
1894 | struct audit_context *context = current->audit_context; | |
1895 | struct audit_aux_data_fd_pair *ax; | |
1896 | ||
1897 | if (likely(!context)) { | |
1898 | return 0; | |
1899 | } | |
1900 | ||
1901 | ax = kmalloc(sizeof(*ax), GFP_KERNEL); | |
1902 | if (!ax) { | |
1903 | return -ENOMEM; | |
1904 | } | |
1905 | ||
1906 | ax->fd[0] = fd1; | |
1907 | ax->fd[1] = fd2; | |
1908 | ||
1909 | ax->d.type = AUDIT_FD_PAIR; | |
1910 | ax->d.next = context->aux; | |
1911 | context->aux = (void *)ax; | |
1912 | return 0; | |
1913 | } | |
1914 | ||
b0dd25a8 RD |
1915 | /** |
1916 | * audit_sockaddr - record audit data for sys_bind, sys_connect, sys_sendto | |
1917 | * @len: data length in user space | |
1918 | * @a: data address in kernel space | |
1919 | * | |
1920 | * Returns 0 for success or NULL context or < 0 on error. | |
1921 | */ | |
3ec3b2fb DW |
1922 | int audit_sockaddr(int len, void *a) |
1923 | { | |
1924 | struct audit_aux_data_sockaddr *ax; | |
1925 | struct audit_context *context = current->audit_context; | |
1926 | ||
5ac3a9c2 | 1927 | if (likely(!context || context->dummy)) |
3ec3b2fb DW |
1928 | return 0; |
1929 | ||
1930 | ax = kmalloc(sizeof(*ax) + len, GFP_KERNEL); | |
1931 | if (!ax) | |
1932 | return -ENOMEM; | |
1933 | ||
1934 | ax->len = len; | |
1935 | memcpy(ax->a, a, len); | |
1936 | ||
1937 | ax->d.type = AUDIT_SOCKADDR; | |
1938 | ax->d.next = context->aux; | |
1939 | context->aux = (void *)ax; | |
1940 | return 0; | |
1941 | } | |
1942 | ||
a5cb013d AV |
1943 | void __audit_ptrace(struct task_struct *t) |
1944 | { | |
1945 | struct audit_context *context = current->audit_context; | |
1946 | ||
1947 | context->target_pid = t->pid; | |
1948 | selinux_get_task_sid(t, &context->target_sid); | |
1949 | } | |
1950 | ||
b0dd25a8 RD |
1951 | /** |
1952 | * audit_avc_path - record the granting or denial of permissions | |
1953 | * @dentry: dentry to record | |
1954 | * @mnt: mnt to record | |
1955 | * | |
1956 | * Returns 0 for success or NULL context or < 0 on error. | |
1957 | * | |
1958 | * Called from security/selinux/avc.c::avc_audit() | |
1959 | */ | |
01116105 SS |
1960 | int audit_avc_path(struct dentry *dentry, struct vfsmount *mnt) |
1961 | { | |
1962 | struct audit_aux_data_path *ax; | |
1963 | struct audit_context *context = current->audit_context; | |
1964 | ||
1965 | if (likely(!context)) | |
1966 | return 0; | |
1967 | ||
1968 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1969 | if (!ax) | |
1970 | return -ENOMEM; | |
1971 | ||
1972 | ax->dentry = dget(dentry); | |
1973 | ax->mnt = mntget(mnt); | |
1974 | ||
1975 | ax->d.type = AUDIT_AVC_PATH; | |
1976 | ax->d.next = context->aux; | |
1977 | context->aux = (void *)ax; | |
1978 | return 0; | |
1979 | } | |
1980 | ||
b0dd25a8 RD |
1981 | /** |
1982 | * audit_signal_info - record signal info for shutting down audit subsystem | |
1983 | * @sig: signal value | |
1984 | * @t: task being signaled | |
1985 | * | |
1986 | * If the audit subsystem is being terminated, record the task (pid) | |
1987 | * and uid that is doing that. | |
1988 | */ | |
e54dc243 | 1989 | int __audit_signal_info(int sig, struct task_struct *t) |
c2f0c7c3 | 1990 | { |
e54dc243 AG |
1991 | struct audit_aux_data_pids *axp; |
1992 | struct task_struct *tsk = current; | |
1993 | struct audit_context *ctx = tsk->audit_context; | |
c2f0c7c3 SG |
1994 | extern pid_t audit_sig_pid; |
1995 | extern uid_t audit_sig_uid; | |
e1396065 AV |
1996 | extern u32 audit_sig_sid; |
1997 | ||
e54dc243 AG |
1998 | if (audit_pid && t->tgid == audit_pid && |
1999 | (sig == SIGTERM || sig == SIGHUP || sig == SIGUSR1)) { | |
e1396065 AV |
2000 | audit_sig_pid = tsk->pid; |
2001 | if (ctx) | |
2002 | audit_sig_uid = ctx->loginuid; | |
2003 | else | |
2004 | audit_sig_uid = tsk->uid; | |
2005 | selinux_get_task_sid(tsk, &audit_sig_sid); | |
c2f0c7c3 | 2006 | } |
e54dc243 AG |
2007 | |
2008 | if (!audit_signals) /* audit_context checked in wrapper */ | |
2009 | return 0; | |
2010 | ||
2011 | /* optimize the common case by putting first signal recipient directly | |
2012 | * in audit_context */ | |
2013 | if (!ctx->target_pid) { | |
2014 | ctx->target_pid = t->tgid; | |
2015 | selinux_get_task_sid(t, &ctx->target_sid); | |
2016 | return 0; | |
2017 | } | |
2018 | ||
2019 | axp = (void *)ctx->aux_pids; | |
2020 | if (!axp || axp->pid_count == AUDIT_AUX_PIDS) { | |
2021 | axp = kzalloc(sizeof(*axp), GFP_ATOMIC); | |
2022 | if (!axp) | |
2023 | return -ENOMEM; | |
2024 | ||
2025 | axp->d.type = AUDIT_OBJ_PID; | |
2026 | axp->d.next = ctx->aux_pids; | |
2027 | ctx->aux_pids = (void *)axp; | |
2028 | } | |
2029 | BUG_ON(axp->pid_count > AUDIT_AUX_PIDS); | |
2030 | ||
2031 | axp->target_pid[axp->pid_count] = t->tgid; | |
2032 | selinux_get_task_sid(t, &axp->target_sid[axp->pid_count]); | |
2033 | axp->pid_count++; | |
2034 | ||
2035 | return 0; | |
c2f0c7c3 | 2036 | } |
0a4ff8c2 SG |
2037 | |
2038 | /** | |
2039 | * audit_core_dumps - record information about processes that end abnormally | |
2040 | * @sig: signal value | |
2041 | * | |
2042 | * If a process ends with a core dump, something fishy is going on and we | |
2043 | * should record the event for investigation. | |
2044 | */ | |
2045 | void audit_core_dumps(long signr) | |
2046 | { | |
2047 | struct audit_buffer *ab; | |
2048 | u32 sid; | |
2049 | ||
2050 | if (!audit_enabled) | |
2051 | return; | |
2052 | ||
2053 | if (signr == SIGQUIT) /* don't care for those */ | |
2054 | return; | |
2055 | ||
2056 | ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_ANOM_ABEND); | |
2057 | audit_log_format(ab, "auid=%u uid=%u gid=%u", | |
2058 | audit_get_loginuid(current->audit_context), | |
2059 | current->uid, current->gid); | |
2060 | selinux_get_task_sid(current, &sid); | |
2061 | if (sid) { | |
2062 | char *ctx = NULL; | |
2063 | u32 len; | |
2064 | ||
2065 | if (selinux_sid_to_string(sid, &ctx, &len)) | |
2066 | audit_log_format(ab, " ssid=%u", sid); | |
2067 | else | |
2068 | audit_log_format(ab, " subj=%s", ctx); | |
2069 | kfree(ctx); | |
2070 | } | |
2071 | audit_log_format(ab, " pid=%d comm=", current->pid); | |
2072 | audit_log_untrustedstring(ab, current->comm); | |
2073 | audit_log_format(ab, " sig=%ld", signr); | |
2074 | audit_log_end(ab); | |
2075 | } |