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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> |
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 LT |
72 | |
73 | /* No syscall auditing will take place unless audit_enabled != 0. */ | |
74 | extern int audit_enabled; | |
75 | ||
76 | /* AUDIT_NAMES is the number of slots we reserve in the audit_context | |
77 | * for saving names from getname(). */ | |
78 | #define AUDIT_NAMES 20 | |
79 | ||
80 | /* AUDIT_NAMES_RESERVED is the number of slots we reserve in the | |
81 | * audit_context from being used for nameless inodes from | |
82 | * path_lookup. */ | |
83 | #define AUDIT_NAMES_RESERVED 7 | |
84 | ||
9c937dcc AG |
85 | /* Indicates that audit should log the full pathname. */ |
86 | #define AUDIT_NAME_FULL -1 | |
87 | ||
1da177e4 LT |
88 | /* When fs/namei.c:getname() is called, we store the pointer in name and |
89 | * we don't let putname() free it (instead we free all of the saved | |
90 | * pointers at syscall exit time). | |
91 | * | |
92 | * Further, in fs/namei.c:path_lookup() we store the inode and device. */ | |
93 | struct audit_names { | |
94 | const char *name; | |
9c937dcc AG |
95 | int name_len; /* number of name's characters to log */ |
96 | unsigned name_put; /* call __putname() for this name */ | |
1da177e4 LT |
97 | unsigned long ino; |
98 | dev_t dev; | |
99 | umode_t mode; | |
100 | uid_t uid; | |
101 | gid_t gid; | |
102 | dev_t rdev; | |
1b50eed9 | 103 | u32 osid; |
1da177e4 LT |
104 | }; |
105 | ||
106 | struct audit_aux_data { | |
107 | struct audit_aux_data *next; | |
108 | int type; | |
109 | }; | |
110 | ||
111 | #define AUDIT_AUX_IPCPERM 0 | |
112 | ||
20ca73bc GW |
113 | struct audit_aux_data_mq_open { |
114 | struct audit_aux_data d; | |
115 | int oflag; | |
116 | mode_t mode; | |
117 | struct mq_attr attr; | |
118 | }; | |
119 | ||
120 | struct audit_aux_data_mq_sendrecv { | |
121 | struct audit_aux_data d; | |
122 | mqd_t mqdes; | |
123 | size_t msg_len; | |
124 | unsigned int msg_prio; | |
125 | struct timespec abs_timeout; | |
126 | }; | |
127 | ||
128 | struct audit_aux_data_mq_notify { | |
129 | struct audit_aux_data d; | |
130 | mqd_t mqdes; | |
131 | struct sigevent notification; | |
132 | }; | |
133 | ||
134 | struct audit_aux_data_mq_getsetattr { | |
135 | struct audit_aux_data d; | |
136 | mqd_t mqdes; | |
137 | struct mq_attr mqstat; | |
138 | }; | |
139 | ||
1da177e4 LT |
140 | struct audit_aux_data_ipcctl { |
141 | struct audit_aux_data d; | |
142 | struct ipc_perm p; | |
143 | unsigned long qbytes; | |
144 | uid_t uid; | |
145 | gid_t gid; | |
146 | mode_t mode; | |
9c7aa6aa | 147 | u32 osid; |
1da177e4 LT |
148 | }; |
149 | ||
473ae30b AV |
150 | struct audit_aux_data_execve { |
151 | struct audit_aux_data d; | |
152 | int argc; | |
153 | int envc; | |
154 | char mem[0]; | |
155 | }; | |
156 | ||
3ec3b2fb DW |
157 | struct audit_aux_data_socketcall { |
158 | struct audit_aux_data d; | |
159 | int nargs; | |
160 | unsigned long args[0]; | |
161 | }; | |
162 | ||
163 | struct audit_aux_data_sockaddr { | |
164 | struct audit_aux_data d; | |
165 | int len; | |
166 | char a[0]; | |
167 | }; | |
168 | ||
01116105 SS |
169 | struct audit_aux_data_path { |
170 | struct audit_aux_data d; | |
171 | struct dentry *dentry; | |
172 | struct vfsmount *mnt; | |
173 | }; | |
1da177e4 LT |
174 | |
175 | /* The per-task audit context. */ | |
176 | struct audit_context { | |
177 | int in_syscall; /* 1 if task is in a syscall */ | |
178 | enum audit_state state; | |
179 | unsigned int serial; /* serial number for record */ | |
180 | struct timespec ctime; /* time of syscall entry */ | |
181 | uid_t loginuid; /* login uid (identity) */ | |
182 | int major; /* syscall number */ | |
183 | unsigned long argv[4]; /* syscall arguments */ | |
184 | int return_valid; /* return code is valid */ | |
2fd6f58b | 185 | long return_code;/* syscall return code */ |
1da177e4 LT |
186 | int auditable; /* 1 if record should be written */ |
187 | int name_count; | |
188 | struct audit_names names[AUDIT_NAMES]; | |
8f37d47c DW |
189 | struct dentry * pwd; |
190 | struct vfsmount * pwdmnt; | |
1da177e4 LT |
191 | struct audit_context *previous; /* For nested syscalls */ |
192 | struct audit_aux_data *aux; | |
193 | ||
194 | /* Save things to print about task_struct */ | |
f46038ff | 195 | pid_t pid, ppid; |
1da177e4 LT |
196 | uid_t uid, euid, suid, fsuid; |
197 | gid_t gid, egid, sgid, fsgid; | |
198 | unsigned long personality; | |
2fd6f58b | 199 | int arch; |
1da177e4 LT |
200 | |
201 | #if AUDIT_DEBUG | |
202 | int put_count; | |
203 | int ino_count; | |
204 | #endif | |
205 | }; | |
206 | ||
f368c07d | 207 | /* Determine if any context name data matches a rule's watch data */ |
1da177e4 LT |
208 | /* Compare a task_struct with an audit_rule. Return 1 on match, 0 |
209 | * otherwise. */ | |
210 | static int audit_filter_rules(struct task_struct *tsk, | |
93315ed6 | 211 | struct audit_krule *rule, |
1da177e4 | 212 | struct audit_context *ctx, |
f368c07d | 213 | struct audit_names *name, |
1da177e4 LT |
214 | enum audit_state *state) |
215 | { | |
2ad312d2 | 216 | int i, j, need_sid = 1; |
3dc7e315 DG |
217 | u32 sid; |
218 | ||
1da177e4 | 219 | for (i = 0; i < rule->field_count; i++) { |
93315ed6 | 220 | struct audit_field *f = &rule->fields[i]; |
1da177e4 LT |
221 | int result = 0; |
222 | ||
93315ed6 | 223 | switch (f->type) { |
1da177e4 | 224 | case AUDIT_PID: |
93315ed6 | 225 | result = audit_comparator(tsk->pid, f->op, f->val); |
1da177e4 | 226 | break; |
3c66251e AV |
227 | case AUDIT_PPID: |
228 | if (ctx) | |
229 | result = audit_comparator(ctx->ppid, f->op, f->val); | |
230 | break; | |
1da177e4 | 231 | case AUDIT_UID: |
93315ed6 | 232 | result = audit_comparator(tsk->uid, f->op, f->val); |
1da177e4 LT |
233 | break; |
234 | case AUDIT_EUID: | |
93315ed6 | 235 | result = audit_comparator(tsk->euid, f->op, f->val); |
1da177e4 LT |
236 | break; |
237 | case AUDIT_SUID: | |
93315ed6 | 238 | result = audit_comparator(tsk->suid, f->op, f->val); |
1da177e4 LT |
239 | break; |
240 | case AUDIT_FSUID: | |
93315ed6 | 241 | result = audit_comparator(tsk->fsuid, f->op, f->val); |
1da177e4 LT |
242 | break; |
243 | case AUDIT_GID: | |
93315ed6 | 244 | result = audit_comparator(tsk->gid, f->op, f->val); |
1da177e4 LT |
245 | break; |
246 | case AUDIT_EGID: | |
93315ed6 | 247 | result = audit_comparator(tsk->egid, f->op, f->val); |
1da177e4 LT |
248 | break; |
249 | case AUDIT_SGID: | |
93315ed6 | 250 | result = audit_comparator(tsk->sgid, f->op, f->val); |
1da177e4 LT |
251 | break; |
252 | case AUDIT_FSGID: | |
93315ed6 | 253 | result = audit_comparator(tsk->fsgid, f->op, f->val); |
1da177e4 LT |
254 | break; |
255 | case AUDIT_PERS: | |
93315ed6 | 256 | result = audit_comparator(tsk->personality, f->op, f->val); |
1da177e4 | 257 | break; |
2fd6f58b | 258 | case AUDIT_ARCH: |
b63862f4 | 259 | if (ctx) |
93315ed6 | 260 | result = audit_comparator(ctx->arch, f->op, f->val); |
2fd6f58b | 261 | break; |
1da177e4 LT |
262 | |
263 | case AUDIT_EXIT: | |
264 | if (ctx && ctx->return_valid) | |
93315ed6 | 265 | result = audit_comparator(ctx->return_code, f->op, f->val); |
1da177e4 LT |
266 | break; |
267 | case AUDIT_SUCCESS: | |
b01f2cc1 | 268 | if (ctx && ctx->return_valid) { |
93315ed6 AG |
269 | if (f->val) |
270 | result = audit_comparator(ctx->return_valid, f->op, AUDITSC_SUCCESS); | |
b01f2cc1 | 271 | else |
93315ed6 | 272 | result = audit_comparator(ctx->return_valid, f->op, AUDITSC_FAILURE); |
b01f2cc1 | 273 | } |
1da177e4 LT |
274 | break; |
275 | case AUDIT_DEVMAJOR: | |
f368c07d AG |
276 | if (name) |
277 | result = audit_comparator(MAJOR(name->dev), | |
278 | f->op, f->val); | |
279 | else if (ctx) { | |
1da177e4 | 280 | for (j = 0; j < ctx->name_count; j++) { |
93315ed6 | 281 | if (audit_comparator(MAJOR(ctx->names[j].dev), f->op, f->val)) { |
1da177e4 LT |
282 | ++result; |
283 | break; | |
284 | } | |
285 | } | |
286 | } | |
287 | break; | |
288 | case AUDIT_DEVMINOR: | |
f368c07d AG |
289 | if (name) |
290 | result = audit_comparator(MINOR(name->dev), | |
291 | f->op, f->val); | |
292 | else if (ctx) { | |
1da177e4 | 293 | for (j = 0; j < ctx->name_count; j++) { |
93315ed6 | 294 | if (audit_comparator(MINOR(ctx->names[j].dev), f->op, f->val)) { |
1da177e4 LT |
295 | ++result; |
296 | break; | |
297 | } | |
298 | } | |
299 | } | |
300 | break; | |
301 | case AUDIT_INODE: | |
f368c07d | 302 | if (name) |
9c937dcc | 303 | result = (name->ino == f->val); |
f368c07d | 304 | else if (ctx) { |
1da177e4 | 305 | for (j = 0; j < ctx->name_count; j++) { |
9c937dcc | 306 | if (audit_comparator(ctx->names[j].ino, f->op, f->val)) { |
1da177e4 LT |
307 | ++result; |
308 | break; | |
309 | } | |
310 | } | |
311 | } | |
312 | break; | |
f368c07d AG |
313 | case AUDIT_WATCH: |
314 | if (name && rule->watch->ino != (unsigned long)-1) | |
315 | result = (name->dev == rule->watch->dev && | |
9c937dcc | 316 | name->ino == rule->watch->ino); |
f368c07d | 317 | break; |
1da177e4 LT |
318 | case AUDIT_LOGINUID: |
319 | result = 0; | |
320 | if (ctx) | |
93315ed6 | 321 | result = audit_comparator(ctx->loginuid, f->op, f->val); |
1da177e4 | 322 | break; |
3dc7e315 DG |
323 | case AUDIT_SE_USER: |
324 | case AUDIT_SE_ROLE: | |
325 | case AUDIT_SE_TYPE: | |
326 | case AUDIT_SE_SEN: | |
327 | case AUDIT_SE_CLR: | |
328 | /* NOTE: this may return negative values indicating | |
329 | a temporary error. We simply treat this as a | |
330 | match for now to avoid losing information that | |
331 | may be wanted. An error message will also be | |
332 | logged upon error */ | |
2ad312d2 SG |
333 | if (f->se_rule) { |
334 | if (need_sid) { | |
335 | selinux_task_ctxid(tsk, &sid); | |
336 | need_sid = 0; | |
337 | } | |
3dc7e315 DG |
338 | result = selinux_audit_rule_match(sid, f->type, |
339 | f->op, | |
340 | f->se_rule, | |
341 | ctx); | |
2ad312d2 | 342 | } |
3dc7e315 | 343 | break; |
1da177e4 LT |
344 | case AUDIT_ARG0: |
345 | case AUDIT_ARG1: | |
346 | case AUDIT_ARG2: | |
347 | case AUDIT_ARG3: | |
348 | if (ctx) | |
93315ed6 | 349 | result = audit_comparator(ctx->argv[f->type-AUDIT_ARG0], f->op, f->val); |
1da177e4 LT |
350 | break; |
351 | } | |
352 | ||
1da177e4 LT |
353 | if (!result) |
354 | return 0; | |
355 | } | |
356 | switch (rule->action) { | |
357 | case AUDIT_NEVER: *state = AUDIT_DISABLED; break; | |
1da177e4 LT |
358 | case AUDIT_ALWAYS: *state = AUDIT_RECORD_CONTEXT; break; |
359 | } | |
360 | return 1; | |
361 | } | |
362 | ||
363 | /* At process creation time, we can determine if system-call auditing is | |
364 | * completely disabled for this task. Since we only have the task | |
365 | * structure at this point, we can only check uid and gid. | |
366 | */ | |
367 | static enum audit_state audit_filter_task(struct task_struct *tsk) | |
368 | { | |
369 | struct audit_entry *e; | |
370 | enum audit_state state; | |
371 | ||
372 | rcu_read_lock(); | |
0f45aa18 | 373 | list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_TASK], list) { |
f368c07d | 374 | if (audit_filter_rules(tsk, &e->rule, NULL, NULL, &state)) { |
1da177e4 LT |
375 | rcu_read_unlock(); |
376 | return state; | |
377 | } | |
378 | } | |
379 | rcu_read_unlock(); | |
380 | return AUDIT_BUILD_CONTEXT; | |
381 | } | |
382 | ||
383 | /* At syscall entry and exit time, this filter is called if the | |
384 | * audit_state is not low enough that auditing cannot take place, but is | |
23f32d18 | 385 | * also not high enough that we already know we have to write an audit |
b0dd25a8 | 386 | * record (i.e., the state is AUDIT_SETUP_CONTEXT or AUDIT_BUILD_CONTEXT). |
1da177e4 LT |
387 | */ |
388 | static enum audit_state audit_filter_syscall(struct task_struct *tsk, | |
389 | struct audit_context *ctx, | |
390 | struct list_head *list) | |
391 | { | |
392 | struct audit_entry *e; | |
c3896495 | 393 | enum audit_state state; |
1da177e4 | 394 | |
351bb722 | 395 | if (audit_pid && tsk->tgid == audit_pid) |
f7056d64 DW |
396 | return AUDIT_DISABLED; |
397 | ||
1da177e4 | 398 | rcu_read_lock(); |
c3896495 | 399 | if (!list_empty(list)) { |
b63862f4 DK |
400 | int word = AUDIT_WORD(ctx->major); |
401 | int bit = AUDIT_BIT(ctx->major); | |
402 | ||
403 | list_for_each_entry_rcu(e, list, list) { | |
f368c07d AG |
404 | if ((e->rule.mask[word] & bit) == bit && |
405 | audit_filter_rules(tsk, &e->rule, ctx, NULL, | |
406 | &state)) { | |
407 | rcu_read_unlock(); | |
408 | return state; | |
409 | } | |
410 | } | |
411 | } | |
412 | rcu_read_unlock(); | |
413 | return AUDIT_BUILD_CONTEXT; | |
414 | } | |
415 | ||
416 | /* At syscall exit time, this filter is called if any audit_names[] have been | |
417 | * collected during syscall processing. We only check rules in sublists at hash | |
418 | * buckets applicable to the inode numbers in audit_names[]. | |
419 | * Regarding audit_state, same rules apply as for audit_filter_syscall(). | |
420 | */ | |
421 | enum audit_state audit_filter_inodes(struct task_struct *tsk, | |
422 | struct audit_context *ctx) | |
423 | { | |
424 | int i; | |
425 | struct audit_entry *e; | |
426 | enum audit_state state; | |
427 | ||
428 | if (audit_pid && tsk->tgid == audit_pid) | |
429 | return AUDIT_DISABLED; | |
430 | ||
431 | rcu_read_lock(); | |
432 | for (i = 0; i < ctx->name_count; i++) { | |
433 | int word = AUDIT_WORD(ctx->major); | |
434 | int bit = AUDIT_BIT(ctx->major); | |
435 | struct audit_names *n = &ctx->names[i]; | |
436 | int h = audit_hash_ino((u32)n->ino); | |
437 | struct list_head *list = &audit_inode_hash[h]; | |
438 | ||
439 | if (list_empty(list)) | |
440 | continue; | |
441 | ||
442 | list_for_each_entry_rcu(e, list, list) { | |
443 | if ((e->rule.mask[word] & bit) == bit && | |
444 | audit_filter_rules(tsk, &e->rule, ctx, n, &state)) { | |
b63862f4 DK |
445 | rcu_read_unlock(); |
446 | return state; | |
447 | } | |
0f45aa18 DW |
448 | } |
449 | } | |
450 | rcu_read_unlock(); | |
1da177e4 | 451 | return AUDIT_BUILD_CONTEXT; |
0f45aa18 DW |
452 | } |
453 | ||
f368c07d AG |
454 | void audit_set_auditable(struct audit_context *ctx) |
455 | { | |
456 | ctx->auditable = 1; | |
457 | } | |
458 | ||
1da177e4 LT |
459 | static inline struct audit_context *audit_get_context(struct task_struct *tsk, |
460 | int return_valid, | |
461 | int return_code) | |
462 | { | |
463 | struct audit_context *context = tsk->audit_context; | |
464 | ||
465 | if (likely(!context)) | |
466 | return NULL; | |
467 | context->return_valid = return_valid; | |
468 | context->return_code = return_code; | |
469 | ||
21af6c4f | 470 | if (context->in_syscall && !context->auditable) { |
1da177e4 | 471 | enum audit_state state; |
f368c07d | 472 | |
0f45aa18 | 473 | state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_EXIT]); |
f368c07d AG |
474 | if (state == AUDIT_RECORD_CONTEXT) { |
475 | context->auditable = 1; | |
476 | goto get_context; | |
477 | } | |
478 | ||
479 | state = audit_filter_inodes(tsk, context); | |
1da177e4 LT |
480 | if (state == AUDIT_RECORD_CONTEXT) |
481 | context->auditable = 1; | |
f368c07d | 482 | |
1da177e4 LT |
483 | } |
484 | ||
f368c07d | 485 | get_context: |
1da177e4 | 486 | context->pid = tsk->pid; |
f46038ff | 487 | context->ppid = sys_getppid(); /* sic. tsk == current in all cases */ |
1da177e4 LT |
488 | context->uid = tsk->uid; |
489 | context->gid = tsk->gid; | |
490 | context->euid = tsk->euid; | |
491 | context->suid = tsk->suid; | |
492 | context->fsuid = tsk->fsuid; | |
493 | context->egid = tsk->egid; | |
494 | context->sgid = tsk->sgid; | |
495 | context->fsgid = tsk->fsgid; | |
496 | context->personality = tsk->personality; | |
497 | tsk->audit_context = NULL; | |
498 | return context; | |
499 | } | |
500 | ||
501 | static inline void audit_free_names(struct audit_context *context) | |
502 | { | |
503 | int i; | |
504 | ||
505 | #if AUDIT_DEBUG == 2 | |
506 | if (context->auditable | |
507 | ||context->put_count + context->ino_count != context->name_count) { | |
73241ccc | 508 | printk(KERN_ERR "%s:%d(:%d): major=%d in_syscall=%d" |
1da177e4 LT |
509 | " name_count=%d put_count=%d" |
510 | " ino_count=%d [NOT freeing]\n", | |
73241ccc | 511 | __FILE__, __LINE__, |
1da177e4 LT |
512 | context->serial, context->major, context->in_syscall, |
513 | context->name_count, context->put_count, | |
514 | context->ino_count); | |
8c8570fb | 515 | for (i = 0; i < context->name_count; i++) { |
1da177e4 LT |
516 | printk(KERN_ERR "names[%d] = %p = %s\n", i, |
517 | context->names[i].name, | |
73241ccc | 518 | context->names[i].name ?: "(null)"); |
8c8570fb | 519 | } |
1da177e4 LT |
520 | dump_stack(); |
521 | return; | |
522 | } | |
523 | #endif | |
524 | #if AUDIT_DEBUG | |
525 | context->put_count = 0; | |
526 | context->ino_count = 0; | |
527 | #endif | |
528 | ||
8c8570fb | 529 | for (i = 0; i < context->name_count; i++) { |
9c937dcc | 530 | if (context->names[i].name && context->names[i].name_put) |
1da177e4 | 531 | __putname(context->names[i].name); |
8c8570fb | 532 | } |
1da177e4 | 533 | context->name_count = 0; |
8f37d47c DW |
534 | if (context->pwd) |
535 | dput(context->pwd); | |
536 | if (context->pwdmnt) | |
537 | mntput(context->pwdmnt); | |
538 | context->pwd = NULL; | |
539 | context->pwdmnt = NULL; | |
1da177e4 LT |
540 | } |
541 | ||
542 | static inline void audit_free_aux(struct audit_context *context) | |
543 | { | |
544 | struct audit_aux_data *aux; | |
545 | ||
546 | while ((aux = context->aux)) { | |
01116105 SS |
547 | if (aux->type == AUDIT_AVC_PATH) { |
548 | struct audit_aux_data_path *axi = (void *)aux; | |
549 | dput(axi->dentry); | |
550 | mntput(axi->mnt); | |
551 | } | |
8c8570fb | 552 | |
1da177e4 LT |
553 | context->aux = aux->next; |
554 | kfree(aux); | |
555 | } | |
556 | } | |
557 | ||
558 | static inline void audit_zero_context(struct audit_context *context, | |
559 | enum audit_state state) | |
560 | { | |
561 | uid_t loginuid = context->loginuid; | |
562 | ||
563 | memset(context, 0, sizeof(*context)); | |
564 | context->state = state; | |
565 | context->loginuid = loginuid; | |
566 | } | |
567 | ||
568 | static inline struct audit_context *audit_alloc_context(enum audit_state state) | |
569 | { | |
570 | struct audit_context *context; | |
571 | ||
572 | if (!(context = kmalloc(sizeof(*context), GFP_KERNEL))) | |
573 | return NULL; | |
574 | audit_zero_context(context, state); | |
575 | return context; | |
576 | } | |
577 | ||
b0dd25a8 RD |
578 | /** |
579 | * audit_alloc - allocate an audit context block for a task | |
580 | * @tsk: task | |
581 | * | |
582 | * Filter on the task information and allocate a per-task audit context | |
1da177e4 LT |
583 | * if necessary. Doing so turns on system call auditing for the |
584 | * specified task. This is called from copy_process, so no lock is | |
b0dd25a8 RD |
585 | * needed. |
586 | */ | |
1da177e4 LT |
587 | int audit_alloc(struct task_struct *tsk) |
588 | { | |
589 | struct audit_context *context; | |
590 | enum audit_state state; | |
591 | ||
592 | if (likely(!audit_enabled)) | |
593 | return 0; /* Return if not auditing. */ | |
594 | ||
595 | state = audit_filter_task(tsk); | |
596 | if (likely(state == AUDIT_DISABLED)) | |
597 | return 0; | |
598 | ||
599 | if (!(context = audit_alloc_context(state))) { | |
600 | audit_log_lost("out of memory in audit_alloc"); | |
601 | return -ENOMEM; | |
602 | } | |
603 | ||
604 | /* Preserve login uid */ | |
605 | context->loginuid = -1; | |
606 | if (current->audit_context) | |
607 | context->loginuid = current->audit_context->loginuid; | |
608 | ||
609 | tsk->audit_context = context; | |
610 | set_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT); | |
611 | return 0; | |
612 | } | |
613 | ||
614 | static inline void audit_free_context(struct audit_context *context) | |
615 | { | |
616 | struct audit_context *previous; | |
617 | int count = 0; | |
618 | ||
619 | do { | |
620 | previous = context->previous; | |
621 | if (previous || (count && count < 10)) { | |
622 | ++count; | |
623 | printk(KERN_ERR "audit(:%d): major=%d name_count=%d:" | |
624 | " freeing multiple contexts (%d)\n", | |
625 | context->serial, context->major, | |
626 | context->name_count, count); | |
627 | } | |
628 | audit_free_names(context); | |
629 | audit_free_aux(context); | |
630 | kfree(context); | |
631 | context = previous; | |
632 | } while (context); | |
633 | if (count >= 10) | |
634 | printk(KERN_ERR "audit: freed %d contexts\n", count); | |
635 | } | |
636 | ||
e495149b | 637 | static void audit_log_task_context(struct audit_buffer *ab) |
8c8570fb DK |
638 | { |
639 | char *ctx = NULL; | |
640 | ssize_t len = 0; | |
641 | ||
642 | len = security_getprocattr(current, "current", NULL, 0); | |
643 | if (len < 0) { | |
644 | if (len != -EINVAL) | |
645 | goto error_path; | |
646 | return; | |
647 | } | |
648 | ||
e495149b | 649 | ctx = kmalloc(len, GFP_KERNEL); |
7306a0b9 | 650 | if (!ctx) |
8c8570fb | 651 | goto error_path; |
8c8570fb DK |
652 | |
653 | len = security_getprocattr(current, "current", ctx, len); | |
654 | if (len < 0 ) | |
655 | goto error_path; | |
656 | ||
657 | audit_log_format(ab, " subj=%s", ctx); | |
7306a0b9 | 658 | return; |
8c8570fb DK |
659 | |
660 | error_path: | |
661 | if (ctx) | |
662 | kfree(ctx); | |
7306a0b9 | 663 | audit_panic("error in audit_log_task_context"); |
8c8570fb DK |
664 | return; |
665 | } | |
666 | ||
e495149b | 667 | static void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk) |
219f0817 | 668 | { |
45d9bb0e AV |
669 | char name[sizeof(tsk->comm)]; |
670 | struct mm_struct *mm = tsk->mm; | |
219f0817 SS |
671 | struct vm_area_struct *vma; |
672 | ||
e495149b AV |
673 | /* tsk == current */ |
674 | ||
45d9bb0e | 675 | get_task_comm(name, tsk); |
99e45eea DW |
676 | audit_log_format(ab, " comm="); |
677 | audit_log_untrustedstring(ab, name); | |
219f0817 | 678 | |
e495149b AV |
679 | if (mm) { |
680 | down_read(&mm->mmap_sem); | |
681 | vma = mm->mmap; | |
682 | while (vma) { | |
683 | if ((vma->vm_flags & VM_EXECUTABLE) && | |
684 | vma->vm_file) { | |
685 | audit_log_d_path(ab, "exe=", | |
686 | vma->vm_file->f_dentry, | |
687 | vma->vm_file->f_vfsmnt); | |
688 | break; | |
689 | } | |
690 | vma = vma->vm_next; | |
219f0817 | 691 | } |
e495149b | 692 | up_read(&mm->mmap_sem); |
219f0817 | 693 | } |
e495149b | 694 | audit_log_task_context(ab); |
219f0817 SS |
695 | } |
696 | ||
e495149b | 697 | static void audit_log_exit(struct audit_context *context, struct task_struct *tsk) |
1da177e4 | 698 | { |
9c7aa6aa | 699 | int i, call_panic = 0; |
1da177e4 | 700 | struct audit_buffer *ab; |
7551ced3 | 701 | struct audit_aux_data *aux; |
a6c043a8 | 702 | const char *tty; |
1da177e4 | 703 | |
e495149b AV |
704 | /* tsk == current */ |
705 | ||
706 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_SYSCALL); | |
1da177e4 LT |
707 | if (!ab) |
708 | return; /* audit_panic has been called */ | |
bccf6ae0 DW |
709 | audit_log_format(ab, "arch=%x syscall=%d", |
710 | context->arch, context->major); | |
1da177e4 LT |
711 | if (context->personality != PER_LINUX) |
712 | audit_log_format(ab, " per=%lx", context->personality); | |
713 | if (context->return_valid) | |
2fd6f58b DW |
714 | audit_log_format(ab, " success=%s exit=%ld", |
715 | (context->return_valid==AUDITSC_SUCCESS)?"yes":"no", | |
716 | context->return_code); | |
45d9bb0e AV |
717 | if (tsk->signal && tsk->signal->tty && tsk->signal->tty->name) |
718 | tty = tsk->signal->tty->name; | |
a6c043a8 SG |
719 | else |
720 | tty = "(none)"; | |
1da177e4 LT |
721 | audit_log_format(ab, |
722 | " a0=%lx a1=%lx a2=%lx a3=%lx items=%d" | |
f46038ff | 723 | " ppid=%d pid=%d auid=%u uid=%u gid=%u" |
326e9c8b | 724 | " euid=%u suid=%u fsuid=%u" |
a6c043a8 | 725 | " egid=%u sgid=%u fsgid=%u tty=%s", |
1da177e4 LT |
726 | context->argv[0], |
727 | context->argv[1], | |
728 | context->argv[2], | |
729 | context->argv[3], | |
730 | context->name_count, | |
f46038ff | 731 | context->ppid, |
1da177e4 LT |
732 | context->pid, |
733 | context->loginuid, | |
734 | context->uid, | |
735 | context->gid, | |
736 | context->euid, context->suid, context->fsuid, | |
a6c043a8 | 737 | context->egid, context->sgid, context->fsgid, tty); |
e495149b | 738 | audit_log_task_info(ab, tsk); |
1da177e4 | 739 | audit_log_end(ab); |
1da177e4 | 740 | |
7551ced3 | 741 | for (aux = context->aux; aux; aux = aux->next) { |
c0404993 | 742 | |
e495149b | 743 | ab = audit_log_start(context, GFP_KERNEL, aux->type); |
1da177e4 LT |
744 | if (!ab) |
745 | continue; /* audit_panic has been called */ | |
746 | ||
1da177e4 | 747 | switch (aux->type) { |
20ca73bc GW |
748 | case AUDIT_MQ_OPEN: { |
749 | struct audit_aux_data_mq_open *axi = (void *)aux; | |
750 | audit_log_format(ab, | |
751 | "oflag=0x%x mode=%#o mq_flags=0x%lx mq_maxmsg=%ld " | |
752 | "mq_msgsize=%ld mq_curmsgs=%ld", | |
753 | axi->oflag, axi->mode, axi->attr.mq_flags, | |
754 | axi->attr.mq_maxmsg, axi->attr.mq_msgsize, | |
755 | axi->attr.mq_curmsgs); | |
756 | break; } | |
757 | ||
758 | case AUDIT_MQ_SENDRECV: { | |
759 | struct audit_aux_data_mq_sendrecv *axi = (void *)aux; | |
760 | audit_log_format(ab, | |
761 | "mqdes=%d msg_len=%zd msg_prio=%u " | |
762 | "abs_timeout_sec=%ld abs_timeout_nsec=%ld", | |
763 | axi->mqdes, axi->msg_len, axi->msg_prio, | |
764 | axi->abs_timeout.tv_sec, axi->abs_timeout.tv_nsec); | |
765 | break; } | |
766 | ||
767 | case AUDIT_MQ_NOTIFY: { | |
768 | struct audit_aux_data_mq_notify *axi = (void *)aux; | |
769 | audit_log_format(ab, | |
770 | "mqdes=%d sigev_signo=%d", | |
771 | axi->mqdes, | |
772 | axi->notification.sigev_signo); | |
773 | break; } | |
774 | ||
775 | case AUDIT_MQ_GETSETATTR: { | |
776 | struct audit_aux_data_mq_getsetattr *axi = (void *)aux; | |
777 | audit_log_format(ab, | |
778 | "mqdes=%d mq_flags=0x%lx mq_maxmsg=%ld mq_msgsize=%ld " | |
779 | "mq_curmsgs=%ld ", | |
780 | axi->mqdes, | |
781 | axi->mqstat.mq_flags, axi->mqstat.mq_maxmsg, | |
782 | axi->mqstat.mq_msgsize, axi->mqstat.mq_curmsgs); | |
783 | break; } | |
784 | ||
c0404993 | 785 | case AUDIT_IPC: { |
1da177e4 LT |
786 | struct audit_aux_data_ipcctl *axi = (void *)aux; |
787 | audit_log_format(ab, | |
ac03221a LK |
788 | "ouid=%u ogid=%u mode=%x", |
789 | axi->uid, axi->gid, axi->mode); | |
9c7aa6aa SG |
790 | if (axi->osid != 0) { |
791 | char *ctx = NULL; | |
792 | u32 len; | |
793 | if (selinux_ctxid_to_string( | |
794 | axi->osid, &ctx, &len)) { | |
ce29b682 | 795 | audit_log_format(ab, " osid=%u", |
9c7aa6aa SG |
796 | axi->osid); |
797 | call_panic = 1; | |
798 | } else | |
799 | audit_log_format(ab, " obj=%s", ctx); | |
800 | kfree(ctx); | |
801 | } | |
3ec3b2fb DW |
802 | break; } |
803 | ||
073115d6 SG |
804 | case AUDIT_IPC_SET_PERM: { |
805 | struct audit_aux_data_ipcctl *axi = (void *)aux; | |
806 | audit_log_format(ab, | |
ac03221a | 807 | "qbytes=%lx ouid=%u ogid=%u mode=%x", |
073115d6 | 808 | axi->qbytes, axi->uid, axi->gid, axi->mode); |
073115d6 | 809 | break; } |
ac03221a | 810 | |
473ae30b AV |
811 | case AUDIT_EXECVE: { |
812 | struct audit_aux_data_execve *axi = (void *)aux; | |
813 | int i; | |
814 | const char *p; | |
815 | for (i = 0, p = axi->mem; i < axi->argc; i++) { | |
816 | audit_log_format(ab, "a%d=", i); | |
817 | p = audit_log_untrustedstring(ab, p); | |
818 | audit_log_format(ab, "\n"); | |
819 | } | |
820 | break; } | |
073115d6 | 821 | |
3ec3b2fb DW |
822 | case AUDIT_SOCKETCALL: { |
823 | int i; | |
824 | struct audit_aux_data_socketcall *axs = (void *)aux; | |
825 | audit_log_format(ab, "nargs=%d", axs->nargs); | |
826 | for (i=0; i<axs->nargs; i++) | |
827 | audit_log_format(ab, " a%d=%lx", i, axs->args[i]); | |
828 | break; } | |
829 | ||
830 | case AUDIT_SOCKADDR: { | |
831 | struct audit_aux_data_sockaddr *axs = (void *)aux; | |
832 | ||
833 | audit_log_format(ab, "saddr="); | |
834 | audit_log_hex(ab, axs->a, axs->len); | |
835 | break; } | |
01116105 SS |
836 | |
837 | case AUDIT_AVC_PATH: { | |
838 | struct audit_aux_data_path *axi = (void *)aux; | |
839 | audit_log_d_path(ab, "path=", axi->dentry, axi->mnt); | |
01116105 SS |
840 | break; } |
841 | ||
1da177e4 LT |
842 | } |
843 | audit_log_end(ab); | |
1da177e4 LT |
844 | } |
845 | ||
8f37d47c | 846 | if (context->pwd && context->pwdmnt) { |
e495149b | 847 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD); |
8f37d47c DW |
848 | if (ab) { |
849 | audit_log_d_path(ab, "cwd=", context->pwd, context->pwdmnt); | |
850 | audit_log_end(ab); | |
851 | } | |
852 | } | |
1da177e4 | 853 | for (i = 0; i < context->name_count; i++) { |
9c937dcc | 854 | struct audit_names *n = &context->names[i]; |
73241ccc | 855 | |
e495149b | 856 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_PATH); |
1da177e4 LT |
857 | if (!ab) |
858 | continue; /* audit_panic has been called */ | |
8f37d47c | 859 | |
1da177e4 | 860 | audit_log_format(ab, "item=%d", i); |
73241ccc | 861 | |
9c937dcc AG |
862 | if (n->name) { |
863 | switch(n->name_len) { | |
864 | case AUDIT_NAME_FULL: | |
865 | /* log the full path */ | |
866 | audit_log_format(ab, " name="); | |
867 | audit_log_untrustedstring(ab, n->name); | |
868 | break; | |
869 | case 0: | |
870 | /* name was specified as a relative path and the | |
871 | * directory component is the cwd */ | |
872 | audit_log_d_path(ab, " name=", context->pwd, | |
873 | context->pwdmnt); | |
874 | break; | |
875 | default: | |
876 | /* log the name's directory component */ | |
877 | audit_log_format(ab, " name="); | |
878 | audit_log_n_untrustedstring(ab, n->name_len, | |
879 | n->name); | |
880 | } | |
881 | } else | |
882 | audit_log_format(ab, " name=(null)"); | |
883 | ||
884 | if (n->ino != (unsigned long)-1) { | |
885 | audit_log_format(ab, " inode=%lu" | |
886 | " dev=%02x:%02x mode=%#o" | |
887 | " ouid=%u ogid=%u rdev=%02x:%02x", | |
888 | n->ino, | |
889 | MAJOR(n->dev), | |
890 | MINOR(n->dev), | |
891 | n->mode, | |
892 | n->uid, | |
893 | n->gid, | |
894 | MAJOR(n->rdev), | |
895 | MINOR(n->rdev)); | |
896 | } | |
897 | if (n->osid != 0) { | |
1b50eed9 SG |
898 | char *ctx = NULL; |
899 | u32 len; | |
900 | if (selinux_ctxid_to_string( | |
9c937dcc AG |
901 | n->osid, &ctx, &len)) { |
902 | audit_log_format(ab, " osid=%u", n->osid); | |
9c7aa6aa | 903 | call_panic = 2; |
1b50eed9 SG |
904 | } else |
905 | audit_log_format(ab, " obj=%s", ctx); | |
906 | kfree(ctx); | |
8c8570fb DK |
907 | } |
908 | ||
1da177e4 LT |
909 | audit_log_end(ab); |
910 | } | |
9c7aa6aa SG |
911 | if (call_panic) |
912 | audit_panic("error converting sid to string"); | |
1da177e4 LT |
913 | } |
914 | ||
b0dd25a8 RD |
915 | /** |
916 | * audit_free - free a per-task audit context | |
917 | * @tsk: task whose audit context block to free | |
918 | * | |
fa84cb93 | 919 | * Called from copy_process and do_exit |
b0dd25a8 | 920 | */ |
1da177e4 LT |
921 | void audit_free(struct task_struct *tsk) |
922 | { | |
923 | struct audit_context *context; | |
924 | ||
1da177e4 | 925 | context = audit_get_context(tsk, 0, 0); |
1da177e4 LT |
926 | if (likely(!context)) |
927 | return; | |
928 | ||
929 | /* Check for system calls that do not go through the exit | |
f5561964 DW |
930 | * function (e.g., exit_group), then free context block. |
931 | * We use GFP_ATOMIC here because we might be doing this | |
932 | * in the context of the idle thread */ | |
e495149b | 933 | /* that can happen only if we are called from do_exit() */ |
f7056d64 | 934 | if (context->in_syscall && context->auditable) |
e495149b | 935 | audit_log_exit(context, tsk); |
1da177e4 LT |
936 | |
937 | audit_free_context(context); | |
938 | } | |
939 | ||
b0dd25a8 RD |
940 | /** |
941 | * audit_syscall_entry - fill in an audit record at syscall entry | |
942 | * @tsk: task being audited | |
943 | * @arch: architecture type | |
944 | * @major: major syscall type (function) | |
945 | * @a1: additional syscall register 1 | |
946 | * @a2: additional syscall register 2 | |
947 | * @a3: additional syscall register 3 | |
948 | * @a4: additional syscall register 4 | |
949 | * | |
950 | * Fill in audit context at syscall entry. This only happens if the | |
1da177e4 LT |
951 | * audit context was created when the task was created and the state or |
952 | * filters demand the audit context be built. If the state from the | |
953 | * per-task filter or from the per-syscall filter is AUDIT_RECORD_CONTEXT, | |
954 | * then the record will be written at syscall exit time (otherwise, it | |
955 | * will only be written if another part of the kernel requests that it | |
b0dd25a8 RD |
956 | * be written). |
957 | */ | |
5411be59 | 958 | void audit_syscall_entry(int arch, int major, |
1da177e4 LT |
959 | unsigned long a1, unsigned long a2, |
960 | unsigned long a3, unsigned long a4) | |
961 | { | |
5411be59 | 962 | struct task_struct *tsk = current; |
1da177e4 LT |
963 | struct audit_context *context = tsk->audit_context; |
964 | enum audit_state state; | |
965 | ||
966 | BUG_ON(!context); | |
967 | ||
b0dd25a8 RD |
968 | /* |
969 | * This happens only on certain architectures that make system | |
1da177e4 LT |
970 | * calls in kernel_thread via the entry.S interface, instead of |
971 | * with direct calls. (If you are porting to a new | |
972 | * architecture, hitting this condition can indicate that you | |
973 | * got the _exit/_leave calls backward in entry.S.) | |
974 | * | |
975 | * i386 no | |
976 | * x86_64 no | |
2ef9481e | 977 | * ppc64 yes (see arch/powerpc/platforms/iseries/misc.S) |
1da177e4 LT |
978 | * |
979 | * This also happens with vm86 emulation in a non-nested manner | |
980 | * (entries without exits), so this case must be caught. | |
981 | */ | |
982 | if (context->in_syscall) { | |
983 | struct audit_context *newctx; | |
984 | ||
1da177e4 LT |
985 | #if AUDIT_DEBUG |
986 | printk(KERN_ERR | |
987 | "audit(:%d) pid=%d in syscall=%d;" | |
988 | " entering syscall=%d\n", | |
989 | context->serial, tsk->pid, context->major, major); | |
990 | #endif | |
991 | newctx = audit_alloc_context(context->state); | |
992 | if (newctx) { | |
993 | newctx->previous = context; | |
994 | context = newctx; | |
995 | tsk->audit_context = newctx; | |
996 | } else { | |
997 | /* If we can't alloc a new context, the best we | |
998 | * can do is to leak memory (any pending putname | |
999 | * will be lost). The only other alternative is | |
1000 | * to abandon auditing. */ | |
1001 | audit_zero_context(context, context->state); | |
1002 | } | |
1003 | } | |
1004 | BUG_ON(context->in_syscall || context->name_count); | |
1005 | ||
1006 | if (!audit_enabled) | |
1007 | return; | |
1008 | ||
2fd6f58b | 1009 | context->arch = arch; |
1da177e4 LT |
1010 | context->major = major; |
1011 | context->argv[0] = a1; | |
1012 | context->argv[1] = a2; | |
1013 | context->argv[2] = a3; | |
1014 | context->argv[3] = a4; | |
1015 | ||
1016 | state = context->state; | |
1017 | if (state == AUDIT_SETUP_CONTEXT || state == AUDIT_BUILD_CONTEXT) | |
0f45aa18 | 1018 | state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_ENTRY]); |
1da177e4 LT |
1019 | if (likely(state == AUDIT_DISABLED)) |
1020 | return; | |
1021 | ||
ce625a80 | 1022 | context->serial = 0; |
1da177e4 LT |
1023 | context->ctime = CURRENT_TIME; |
1024 | context->in_syscall = 1; | |
1025 | context->auditable = !!(state == AUDIT_RECORD_CONTEXT); | |
1026 | } | |
1027 | ||
b0dd25a8 RD |
1028 | /** |
1029 | * audit_syscall_exit - deallocate audit context after a system call | |
1030 | * @tsk: task being audited | |
1031 | * @valid: success/failure flag | |
1032 | * @return_code: syscall return value | |
1033 | * | |
1034 | * Tear down after system call. If the audit context has been marked as | |
1da177e4 LT |
1035 | * auditable (either because of the AUDIT_RECORD_CONTEXT state from |
1036 | * filtering, or because some other part of the kernel write an audit | |
1037 | * message), then write out the syscall information. In call cases, | |
b0dd25a8 RD |
1038 | * free the names stored from getname(). |
1039 | */ | |
5411be59 | 1040 | void audit_syscall_exit(int valid, long return_code) |
1da177e4 | 1041 | { |
5411be59 | 1042 | struct task_struct *tsk = current; |
1da177e4 LT |
1043 | struct audit_context *context; |
1044 | ||
2fd6f58b | 1045 | context = audit_get_context(tsk, valid, return_code); |
1da177e4 | 1046 | |
1da177e4 | 1047 | if (likely(!context)) |
97e94c45 | 1048 | return; |
1da177e4 | 1049 | |
f7056d64 | 1050 | if (context->in_syscall && context->auditable) |
e495149b | 1051 | audit_log_exit(context, tsk); |
1da177e4 LT |
1052 | |
1053 | context->in_syscall = 0; | |
1054 | context->auditable = 0; | |
2fd6f58b | 1055 | |
1da177e4 LT |
1056 | if (context->previous) { |
1057 | struct audit_context *new_context = context->previous; | |
1058 | context->previous = NULL; | |
1059 | audit_free_context(context); | |
1060 | tsk->audit_context = new_context; | |
1061 | } else { | |
1062 | audit_free_names(context); | |
1063 | audit_free_aux(context); | |
1da177e4 LT |
1064 | tsk->audit_context = context; |
1065 | } | |
1da177e4 LT |
1066 | } |
1067 | ||
b0dd25a8 RD |
1068 | /** |
1069 | * audit_getname - add a name to the list | |
1070 | * @name: name to add | |
1071 | * | |
1072 | * Add a name to the list of audit names for this context. | |
1073 | * Called from fs/namei.c:getname(). | |
1074 | */ | |
d8945bb5 | 1075 | void __audit_getname(const char *name) |
1da177e4 LT |
1076 | { |
1077 | struct audit_context *context = current->audit_context; | |
1078 | ||
d8945bb5 | 1079 | if (IS_ERR(name) || !name) |
1da177e4 LT |
1080 | return; |
1081 | ||
1082 | if (!context->in_syscall) { | |
1083 | #if AUDIT_DEBUG == 2 | |
1084 | printk(KERN_ERR "%s:%d(:%d): ignoring getname(%p)\n", | |
1085 | __FILE__, __LINE__, context->serial, name); | |
1086 | dump_stack(); | |
1087 | #endif | |
1088 | return; | |
1089 | } | |
1090 | BUG_ON(context->name_count >= AUDIT_NAMES); | |
1091 | context->names[context->name_count].name = name; | |
9c937dcc AG |
1092 | context->names[context->name_count].name_len = AUDIT_NAME_FULL; |
1093 | context->names[context->name_count].name_put = 1; | |
1da177e4 LT |
1094 | context->names[context->name_count].ino = (unsigned long)-1; |
1095 | ++context->name_count; | |
8f37d47c DW |
1096 | if (!context->pwd) { |
1097 | read_lock(¤t->fs->lock); | |
1098 | context->pwd = dget(current->fs->pwd); | |
1099 | context->pwdmnt = mntget(current->fs->pwdmnt); | |
1100 | read_unlock(¤t->fs->lock); | |
1101 | } | |
1102 | ||
1da177e4 LT |
1103 | } |
1104 | ||
b0dd25a8 RD |
1105 | /* audit_putname - intercept a putname request |
1106 | * @name: name to intercept and delay for putname | |
1107 | * | |
1108 | * If we have stored the name from getname in the audit context, | |
1109 | * then we delay the putname until syscall exit. | |
1110 | * Called from include/linux/fs.h:putname(). | |
1111 | */ | |
1da177e4 LT |
1112 | void audit_putname(const char *name) |
1113 | { | |
1114 | struct audit_context *context = current->audit_context; | |
1115 | ||
1116 | BUG_ON(!context); | |
1117 | if (!context->in_syscall) { | |
1118 | #if AUDIT_DEBUG == 2 | |
1119 | printk(KERN_ERR "%s:%d(:%d): __putname(%p)\n", | |
1120 | __FILE__, __LINE__, context->serial, name); | |
1121 | if (context->name_count) { | |
1122 | int i; | |
1123 | for (i = 0; i < context->name_count; i++) | |
1124 | printk(KERN_ERR "name[%d] = %p = %s\n", i, | |
1125 | context->names[i].name, | |
73241ccc | 1126 | context->names[i].name ?: "(null)"); |
1da177e4 LT |
1127 | } |
1128 | #endif | |
1129 | __putname(name); | |
1130 | } | |
1131 | #if AUDIT_DEBUG | |
1132 | else { | |
1133 | ++context->put_count; | |
1134 | if (context->put_count > context->name_count) { | |
1135 | printk(KERN_ERR "%s:%d(:%d): major=%d" | |
1136 | " in_syscall=%d putname(%p) name_count=%d" | |
1137 | " put_count=%d\n", | |
1138 | __FILE__, __LINE__, | |
1139 | context->serial, context->major, | |
1140 | context->in_syscall, name, context->name_count, | |
1141 | context->put_count); | |
1142 | dump_stack(); | |
1143 | } | |
1144 | } | |
1145 | #endif | |
1146 | } | |
1147 | ||
9c7aa6aa | 1148 | static void audit_inode_context(int idx, const struct inode *inode) |
8c8570fb DK |
1149 | { |
1150 | struct audit_context *context = current->audit_context; | |
8c8570fb | 1151 | |
1b50eed9 | 1152 | selinux_get_inode_sid(inode, &context->names[idx].osid); |
8c8570fb DK |
1153 | } |
1154 | ||
1155 | ||
b0dd25a8 RD |
1156 | /** |
1157 | * audit_inode - store the inode and device from a lookup | |
1158 | * @name: name being audited | |
1159 | * @inode: inode being audited | |
b0dd25a8 RD |
1160 | * |
1161 | * Called from fs/namei.c:path_lookup(). | |
1162 | */ | |
9c937dcc | 1163 | void __audit_inode(const char *name, const struct inode *inode) |
1da177e4 LT |
1164 | { |
1165 | int idx; | |
1166 | struct audit_context *context = current->audit_context; | |
1167 | ||
1168 | if (!context->in_syscall) | |
1169 | return; | |
1170 | if (context->name_count | |
1171 | && context->names[context->name_count-1].name | |
1172 | && context->names[context->name_count-1].name == name) | |
1173 | idx = context->name_count - 1; | |
1174 | else if (context->name_count > 1 | |
1175 | && context->names[context->name_count-2].name | |
1176 | && context->names[context->name_count-2].name == name) | |
1177 | idx = context->name_count - 2; | |
1178 | else { | |
1179 | /* FIXME: how much do we care about inodes that have no | |
1180 | * associated name? */ | |
1181 | if (context->name_count >= AUDIT_NAMES - AUDIT_NAMES_RESERVED) | |
1182 | return; | |
1183 | idx = context->name_count++; | |
1184 | context->names[idx].name = NULL; | |
1185 | #if AUDIT_DEBUG | |
1186 | ++context->ino_count; | |
1187 | #endif | |
1188 | } | |
9c937dcc | 1189 | context->names[idx].ino = inode->i_ino; |
ae7b961b DW |
1190 | context->names[idx].dev = inode->i_sb->s_dev; |
1191 | context->names[idx].mode = inode->i_mode; | |
1192 | context->names[idx].uid = inode->i_uid; | |
1193 | context->names[idx].gid = inode->i_gid; | |
1194 | context->names[idx].rdev = inode->i_rdev; | |
8c8570fb | 1195 | audit_inode_context(idx, inode); |
73241ccc AG |
1196 | } |
1197 | ||
1198 | /** | |
1199 | * audit_inode_child - collect inode info for created/removed objects | |
1200 | * @dname: inode's dentry name | |
1201 | * @inode: inode being audited | |
1202 | * @pino: inode number of dentry parent | |
1203 | * | |
1204 | * For syscalls that create or remove filesystem objects, audit_inode | |
1205 | * can only collect information for the filesystem object's parent. | |
1206 | * This call updates the audit context with the child's information. | |
1207 | * Syscalls that create a new filesystem object must be hooked after | |
1208 | * the object is created. Syscalls that remove a filesystem object | |
1209 | * must be hooked prior, in order to capture the target inode during | |
1210 | * unsuccessful attempts. | |
1211 | */ | |
1212 | void __audit_inode_child(const char *dname, const struct inode *inode, | |
1213 | unsigned long pino) | |
1214 | { | |
1215 | int idx; | |
1216 | struct audit_context *context = current->audit_context; | |
9c937dcc AG |
1217 | const char *found_name = NULL; |
1218 | int dirlen = 0; | |
73241ccc AG |
1219 | |
1220 | if (!context->in_syscall) | |
1221 | return; | |
1222 | ||
1223 | /* determine matching parent */ | |
f368c07d | 1224 | if (!dname) |
9c937dcc | 1225 | goto update_context; |
f368c07d | 1226 | for (idx = 0; idx < context->name_count; idx++) |
9c937dcc | 1227 | if (context->names[idx].ino == pino) { |
f368c07d | 1228 | const char *name = context->names[idx].name; |
73241ccc | 1229 | |
f368c07d AG |
1230 | if (!name) |
1231 | continue; | |
1232 | ||
9c937dcc AG |
1233 | if (audit_compare_dname_path(dname, name, &dirlen) == 0) { |
1234 | context->names[idx].name_len = dirlen; | |
1235 | found_name = name; | |
1236 | break; | |
1237 | } | |
f368c07d | 1238 | } |
73241ccc | 1239 | |
9c937dcc | 1240 | update_context: |
73241ccc | 1241 | idx = context->name_count++; |
73241ccc AG |
1242 | #if AUDIT_DEBUG |
1243 | context->ino_count++; | |
1244 | #endif | |
9c937dcc AG |
1245 | /* Re-use the name belonging to the slot for a matching parent directory. |
1246 | * All names for this context are relinquished in audit_free_names() */ | |
1247 | context->names[idx].name = found_name; | |
1248 | context->names[idx].name_len = AUDIT_NAME_FULL; | |
1249 | context->names[idx].name_put = 0; /* don't call __putname() */ | |
73241ccc | 1250 | |
73241ccc AG |
1251 | if (inode) { |
1252 | context->names[idx].ino = inode->i_ino; | |
1253 | context->names[idx].dev = inode->i_sb->s_dev; | |
1254 | context->names[idx].mode = inode->i_mode; | |
1255 | context->names[idx].uid = inode->i_uid; | |
1256 | context->names[idx].gid = inode->i_gid; | |
1257 | context->names[idx].rdev = inode->i_rdev; | |
8c8570fb | 1258 | audit_inode_context(idx, inode); |
9c937dcc AG |
1259 | } else |
1260 | context->names[idx].ino = (unsigned long)-1; | |
1da177e4 LT |
1261 | } |
1262 | ||
b0dd25a8 RD |
1263 | /** |
1264 | * auditsc_get_stamp - get local copies of audit_context values | |
1265 | * @ctx: audit_context for the task | |
1266 | * @t: timespec to store time recorded in the audit_context | |
1267 | * @serial: serial value that is recorded in the audit_context | |
1268 | * | |
1269 | * Also sets the context as auditable. | |
1270 | */ | |
bfb4496e DW |
1271 | void auditsc_get_stamp(struct audit_context *ctx, |
1272 | struct timespec *t, unsigned int *serial) | |
1da177e4 | 1273 | { |
ce625a80 DW |
1274 | if (!ctx->serial) |
1275 | ctx->serial = audit_serial(); | |
bfb4496e DW |
1276 | t->tv_sec = ctx->ctime.tv_sec; |
1277 | t->tv_nsec = ctx->ctime.tv_nsec; | |
1278 | *serial = ctx->serial; | |
1279 | ctx->auditable = 1; | |
1da177e4 LT |
1280 | } |
1281 | ||
b0dd25a8 RD |
1282 | /** |
1283 | * audit_set_loginuid - set a task's audit_context loginuid | |
1284 | * @task: task whose audit context is being modified | |
1285 | * @loginuid: loginuid value | |
1286 | * | |
1287 | * Returns 0. | |
1288 | * | |
1289 | * Called (set) from fs/proc/base.c::proc_loginuid_write(). | |
1290 | */ | |
456be6cd | 1291 | int audit_set_loginuid(struct task_struct *task, uid_t loginuid) |
1da177e4 | 1292 | { |
41757106 SG |
1293 | struct audit_context *context = task->audit_context; |
1294 | ||
1295 | if (context) { | |
1296 | /* Only log if audit is enabled */ | |
1297 | if (context->in_syscall) { | |
1298 | struct audit_buffer *ab; | |
1299 | ||
1300 | ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_LOGIN); | |
1301 | if (ab) { | |
1302 | audit_log_format(ab, "login pid=%d uid=%u " | |
1303 | "old auid=%u new auid=%u", | |
1304 | task->pid, task->uid, | |
1305 | context->loginuid, loginuid); | |
1306 | audit_log_end(ab); | |
1307 | } | |
c0404993 | 1308 | } |
41757106 | 1309 | context->loginuid = loginuid; |
1da177e4 LT |
1310 | } |
1311 | return 0; | |
1312 | } | |
1313 | ||
b0dd25a8 RD |
1314 | /** |
1315 | * audit_get_loginuid - get the loginuid for an audit_context | |
1316 | * @ctx: the audit_context | |
1317 | * | |
1318 | * Returns the context's loginuid or -1 if @ctx is NULL. | |
1319 | */ | |
1da177e4 LT |
1320 | uid_t audit_get_loginuid(struct audit_context *ctx) |
1321 | { | |
1322 | return ctx ? ctx->loginuid : -1; | |
1323 | } | |
1324 | ||
20ca73bc GW |
1325 | /** |
1326 | * __audit_mq_open - record audit data for a POSIX MQ open | |
1327 | * @oflag: open flag | |
1328 | * @mode: mode bits | |
1329 | * @u_attr: queue attributes | |
1330 | * | |
1331 | * Returns 0 for success or NULL context or < 0 on error. | |
1332 | */ | |
1333 | int __audit_mq_open(int oflag, mode_t mode, struct mq_attr __user *u_attr) | |
1334 | { | |
1335 | struct audit_aux_data_mq_open *ax; | |
1336 | struct audit_context *context = current->audit_context; | |
1337 | ||
1338 | if (!audit_enabled) | |
1339 | return 0; | |
1340 | ||
1341 | if (likely(!context)) | |
1342 | return 0; | |
1343 | ||
1344 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1345 | if (!ax) | |
1346 | return -ENOMEM; | |
1347 | ||
1348 | if (u_attr != NULL) { | |
1349 | if (copy_from_user(&ax->attr, u_attr, sizeof(ax->attr))) { | |
1350 | kfree(ax); | |
1351 | return -EFAULT; | |
1352 | } | |
1353 | } else | |
1354 | memset(&ax->attr, 0, sizeof(ax->attr)); | |
1355 | ||
1356 | ax->oflag = oflag; | |
1357 | ax->mode = mode; | |
1358 | ||
1359 | ax->d.type = AUDIT_MQ_OPEN; | |
1360 | ax->d.next = context->aux; | |
1361 | context->aux = (void *)ax; | |
1362 | return 0; | |
1363 | } | |
1364 | ||
1365 | /** | |
1366 | * __audit_mq_timedsend - record audit data for a POSIX MQ timed send | |
1367 | * @mqdes: MQ descriptor | |
1368 | * @msg_len: Message length | |
1369 | * @msg_prio: Message priority | |
1370 | * @abs_timeout: Message timeout in absolute time | |
1371 | * | |
1372 | * Returns 0 for success or NULL context or < 0 on error. | |
1373 | */ | |
1374 | int __audit_mq_timedsend(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, | |
1375 | const struct timespec __user *u_abs_timeout) | |
1376 | { | |
1377 | struct audit_aux_data_mq_sendrecv *ax; | |
1378 | struct audit_context *context = current->audit_context; | |
1379 | ||
1380 | if (!audit_enabled) | |
1381 | return 0; | |
1382 | ||
1383 | if (likely(!context)) | |
1384 | return 0; | |
1385 | ||
1386 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1387 | if (!ax) | |
1388 | return -ENOMEM; | |
1389 | ||
1390 | if (u_abs_timeout != NULL) { | |
1391 | if (copy_from_user(&ax->abs_timeout, u_abs_timeout, sizeof(ax->abs_timeout))) { | |
1392 | kfree(ax); | |
1393 | return -EFAULT; | |
1394 | } | |
1395 | } else | |
1396 | memset(&ax->abs_timeout, 0, sizeof(ax->abs_timeout)); | |
1397 | ||
1398 | ax->mqdes = mqdes; | |
1399 | ax->msg_len = msg_len; | |
1400 | ax->msg_prio = msg_prio; | |
1401 | ||
1402 | ax->d.type = AUDIT_MQ_SENDRECV; | |
1403 | ax->d.next = context->aux; | |
1404 | context->aux = (void *)ax; | |
1405 | return 0; | |
1406 | } | |
1407 | ||
1408 | /** | |
1409 | * __audit_mq_timedreceive - record audit data for a POSIX MQ timed receive | |
1410 | * @mqdes: MQ descriptor | |
1411 | * @msg_len: Message length | |
1412 | * @msg_prio: Message priority | |
1413 | * @abs_timeout: Message timeout in absolute time | |
1414 | * | |
1415 | * Returns 0 for success or NULL context or < 0 on error. | |
1416 | */ | |
1417 | int __audit_mq_timedreceive(mqd_t mqdes, size_t msg_len, | |
1418 | unsigned int __user *u_msg_prio, | |
1419 | const struct timespec __user *u_abs_timeout) | |
1420 | { | |
1421 | struct audit_aux_data_mq_sendrecv *ax; | |
1422 | struct audit_context *context = current->audit_context; | |
1423 | ||
1424 | if (!audit_enabled) | |
1425 | return 0; | |
1426 | ||
1427 | if (likely(!context)) | |
1428 | return 0; | |
1429 | ||
1430 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1431 | if (!ax) | |
1432 | return -ENOMEM; | |
1433 | ||
1434 | if (u_msg_prio != NULL) { | |
1435 | if (get_user(ax->msg_prio, u_msg_prio)) { | |
1436 | kfree(ax); | |
1437 | return -EFAULT; | |
1438 | } | |
1439 | } else | |
1440 | ax->msg_prio = 0; | |
1441 | ||
1442 | if (u_abs_timeout != NULL) { | |
1443 | if (copy_from_user(&ax->abs_timeout, u_abs_timeout, sizeof(ax->abs_timeout))) { | |
1444 | kfree(ax); | |
1445 | return -EFAULT; | |
1446 | } | |
1447 | } else | |
1448 | memset(&ax->abs_timeout, 0, sizeof(ax->abs_timeout)); | |
1449 | ||
1450 | ax->mqdes = mqdes; | |
1451 | ax->msg_len = msg_len; | |
1452 | ||
1453 | ax->d.type = AUDIT_MQ_SENDRECV; | |
1454 | ax->d.next = context->aux; | |
1455 | context->aux = (void *)ax; | |
1456 | return 0; | |
1457 | } | |
1458 | ||
1459 | /** | |
1460 | * __audit_mq_notify - record audit data for a POSIX MQ notify | |
1461 | * @mqdes: MQ descriptor | |
1462 | * @u_notification: Notification event | |
1463 | * | |
1464 | * Returns 0 for success or NULL context or < 0 on error. | |
1465 | */ | |
1466 | ||
1467 | int __audit_mq_notify(mqd_t mqdes, const struct sigevent __user *u_notification) | |
1468 | { | |
1469 | struct audit_aux_data_mq_notify *ax; | |
1470 | struct audit_context *context = current->audit_context; | |
1471 | ||
1472 | if (!audit_enabled) | |
1473 | return 0; | |
1474 | ||
1475 | if (likely(!context)) | |
1476 | return 0; | |
1477 | ||
1478 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1479 | if (!ax) | |
1480 | return -ENOMEM; | |
1481 | ||
1482 | if (u_notification != NULL) { | |
1483 | if (copy_from_user(&ax->notification, u_notification, sizeof(ax->notification))) { | |
1484 | kfree(ax); | |
1485 | return -EFAULT; | |
1486 | } | |
1487 | } else | |
1488 | memset(&ax->notification, 0, sizeof(ax->notification)); | |
1489 | ||
1490 | ax->mqdes = mqdes; | |
1491 | ||
1492 | ax->d.type = AUDIT_MQ_NOTIFY; | |
1493 | ax->d.next = context->aux; | |
1494 | context->aux = (void *)ax; | |
1495 | return 0; | |
1496 | } | |
1497 | ||
1498 | /** | |
1499 | * __audit_mq_getsetattr - record audit data for a POSIX MQ get/set attribute | |
1500 | * @mqdes: MQ descriptor | |
1501 | * @mqstat: MQ flags | |
1502 | * | |
1503 | * Returns 0 for success or NULL context or < 0 on error. | |
1504 | */ | |
1505 | int __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat) | |
1506 | { | |
1507 | struct audit_aux_data_mq_getsetattr *ax; | |
1508 | struct audit_context *context = current->audit_context; | |
1509 | ||
1510 | if (!audit_enabled) | |
1511 | return 0; | |
1512 | ||
1513 | if (likely(!context)) | |
1514 | return 0; | |
1515 | ||
1516 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1517 | if (!ax) | |
1518 | return -ENOMEM; | |
1519 | ||
1520 | ax->mqdes = mqdes; | |
1521 | ax->mqstat = *mqstat; | |
1522 | ||
1523 | ax->d.type = AUDIT_MQ_GETSETATTR; | |
1524 | ax->d.next = context->aux; | |
1525 | context->aux = (void *)ax; | |
1526 | return 0; | |
1527 | } | |
1528 | ||
b0dd25a8 | 1529 | /** |
073115d6 SG |
1530 | * audit_ipc_obj - record audit data for ipc object |
1531 | * @ipcp: ipc permissions | |
1532 | * | |
1533 | * Returns 0 for success or NULL context or < 0 on error. | |
1534 | */ | |
d8945bb5 | 1535 | int __audit_ipc_obj(struct kern_ipc_perm *ipcp) |
073115d6 SG |
1536 | { |
1537 | struct audit_aux_data_ipcctl *ax; | |
1538 | struct audit_context *context = current->audit_context; | |
1539 | ||
073115d6 SG |
1540 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); |
1541 | if (!ax) | |
1542 | return -ENOMEM; | |
1543 | ||
1544 | ax->uid = ipcp->uid; | |
1545 | ax->gid = ipcp->gid; | |
1546 | ax->mode = ipcp->mode; | |
1547 | selinux_get_ipc_sid(ipcp, &ax->osid); | |
1548 | ||
1549 | ax->d.type = AUDIT_IPC; | |
1550 | ax->d.next = context->aux; | |
1551 | context->aux = (void *)ax; | |
1552 | return 0; | |
1553 | } | |
1554 | ||
1555 | /** | |
1556 | * audit_ipc_set_perm - record audit data for new ipc permissions | |
b0dd25a8 RD |
1557 | * @qbytes: msgq bytes |
1558 | * @uid: msgq user id | |
1559 | * @gid: msgq group id | |
1560 | * @mode: msgq mode (permissions) | |
862f5f01 | 1561 | * @ipcp: in-kernel IPC permissions |
b0dd25a8 RD |
1562 | * |
1563 | * Returns 0 for success or NULL context or < 0 on error. | |
1564 | */ | |
d8945bb5 | 1565 | int __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode) |
1da177e4 LT |
1566 | { |
1567 | struct audit_aux_data_ipcctl *ax; | |
1568 | struct audit_context *context = current->audit_context; | |
1569 | ||
8c8570fb | 1570 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); |
1da177e4 LT |
1571 | if (!ax) |
1572 | return -ENOMEM; | |
1573 | ||
1574 | ax->qbytes = qbytes; | |
1575 | ax->uid = uid; | |
1576 | ax->gid = gid; | |
1577 | ax->mode = mode; | |
1578 | ||
073115d6 | 1579 | ax->d.type = AUDIT_IPC_SET_PERM; |
1da177e4 LT |
1580 | ax->d.next = context->aux; |
1581 | context->aux = (void *)ax; | |
1582 | return 0; | |
1583 | } | |
c2f0c7c3 | 1584 | |
473ae30b AV |
1585 | int audit_bprm(struct linux_binprm *bprm) |
1586 | { | |
1587 | struct audit_aux_data_execve *ax; | |
1588 | struct audit_context *context = current->audit_context; | |
1589 | unsigned long p, next; | |
1590 | void *to; | |
1591 | ||
1592 | if (likely(!audit_enabled || !context)) | |
1593 | return 0; | |
1594 | ||
1595 | ax = kmalloc(sizeof(*ax) + PAGE_SIZE * MAX_ARG_PAGES - bprm->p, | |
1596 | GFP_KERNEL); | |
1597 | if (!ax) | |
1598 | return -ENOMEM; | |
1599 | ||
1600 | ax->argc = bprm->argc; | |
1601 | ax->envc = bprm->envc; | |
1602 | for (p = bprm->p, to = ax->mem; p < MAX_ARG_PAGES*PAGE_SIZE; p = next) { | |
1603 | struct page *page = bprm->page[p / PAGE_SIZE]; | |
1604 | void *kaddr = kmap(page); | |
1605 | next = (p + PAGE_SIZE) & ~(PAGE_SIZE - 1); | |
1606 | memcpy(to, kaddr + (p & (PAGE_SIZE - 1)), next - p); | |
1607 | to += next - p; | |
1608 | kunmap(page); | |
1609 | } | |
1610 | ||
1611 | ax->d.type = AUDIT_EXECVE; | |
1612 | ax->d.next = context->aux; | |
1613 | context->aux = (void *)ax; | |
1614 | return 0; | |
1615 | } | |
1616 | ||
1617 | ||
b0dd25a8 RD |
1618 | /** |
1619 | * audit_socketcall - record audit data for sys_socketcall | |
1620 | * @nargs: number of args | |
1621 | * @args: args array | |
1622 | * | |
1623 | * Returns 0 for success or NULL context or < 0 on error. | |
1624 | */ | |
3ec3b2fb DW |
1625 | int audit_socketcall(int nargs, unsigned long *args) |
1626 | { | |
1627 | struct audit_aux_data_socketcall *ax; | |
1628 | struct audit_context *context = current->audit_context; | |
1629 | ||
1630 | if (likely(!context)) | |
1631 | return 0; | |
1632 | ||
1633 | ax = kmalloc(sizeof(*ax) + nargs * sizeof(unsigned long), GFP_KERNEL); | |
1634 | if (!ax) | |
1635 | return -ENOMEM; | |
1636 | ||
1637 | ax->nargs = nargs; | |
1638 | memcpy(ax->args, args, nargs * sizeof(unsigned long)); | |
1639 | ||
1640 | ax->d.type = AUDIT_SOCKETCALL; | |
1641 | ax->d.next = context->aux; | |
1642 | context->aux = (void *)ax; | |
1643 | return 0; | |
1644 | } | |
1645 | ||
b0dd25a8 RD |
1646 | /** |
1647 | * audit_sockaddr - record audit data for sys_bind, sys_connect, sys_sendto | |
1648 | * @len: data length in user space | |
1649 | * @a: data address in kernel space | |
1650 | * | |
1651 | * Returns 0 for success or NULL context or < 0 on error. | |
1652 | */ | |
3ec3b2fb DW |
1653 | int audit_sockaddr(int len, void *a) |
1654 | { | |
1655 | struct audit_aux_data_sockaddr *ax; | |
1656 | struct audit_context *context = current->audit_context; | |
1657 | ||
1658 | if (likely(!context)) | |
1659 | return 0; | |
1660 | ||
1661 | ax = kmalloc(sizeof(*ax) + len, GFP_KERNEL); | |
1662 | if (!ax) | |
1663 | return -ENOMEM; | |
1664 | ||
1665 | ax->len = len; | |
1666 | memcpy(ax->a, a, len); | |
1667 | ||
1668 | ax->d.type = AUDIT_SOCKADDR; | |
1669 | ax->d.next = context->aux; | |
1670 | context->aux = (void *)ax; | |
1671 | return 0; | |
1672 | } | |
1673 | ||
b0dd25a8 RD |
1674 | /** |
1675 | * audit_avc_path - record the granting or denial of permissions | |
1676 | * @dentry: dentry to record | |
1677 | * @mnt: mnt to record | |
1678 | * | |
1679 | * Returns 0 for success or NULL context or < 0 on error. | |
1680 | * | |
1681 | * Called from security/selinux/avc.c::avc_audit() | |
1682 | */ | |
01116105 SS |
1683 | int audit_avc_path(struct dentry *dentry, struct vfsmount *mnt) |
1684 | { | |
1685 | struct audit_aux_data_path *ax; | |
1686 | struct audit_context *context = current->audit_context; | |
1687 | ||
1688 | if (likely(!context)) | |
1689 | return 0; | |
1690 | ||
1691 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1692 | if (!ax) | |
1693 | return -ENOMEM; | |
1694 | ||
1695 | ax->dentry = dget(dentry); | |
1696 | ax->mnt = mntget(mnt); | |
1697 | ||
1698 | ax->d.type = AUDIT_AVC_PATH; | |
1699 | ax->d.next = context->aux; | |
1700 | context->aux = (void *)ax; | |
1701 | return 0; | |
1702 | } | |
1703 | ||
b0dd25a8 RD |
1704 | /** |
1705 | * audit_signal_info - record signal info for shutting down audit subsystem | |
1706 | * @sig: signal value | |
1707 | * @t: task being signaled | |
1708 | * | |
1709 | * If the audit subsystem is being terminated, record the task (pid) | |
1710 | * and uid that is doing that. | |
1711 | */ | |
e1396065 | 1712 | void __audit_signal_info(int sig, struct task_struct *t) |
c2f0c7c3 SG |
1713 | { |
1714 | extern pid_t audit_sig_pid; | |
1715 | extern uid_t audit_sig_uid; | |
e1396065 AV |
1716 | extern u32 audit_sig_sid; |
1717 | ||
1718 | if (sig == SIGTERM || sig == SIGHUP || sig == SIGUSR1) { | |
1719 | struct task_struct *tsk = current; | |
1720 | struct audit_context *ctx = tsk->audit_context; | |
1721 | audit_sig_pid = tsk->pid; | |
1722 | if (ctx) | |
1723 | audit_sig_uid = ctx->loginuid; | |
1724 | else | |
1725 | audit_sig_uid = tsk->uid; | |
1726 | selinux_get_task_sid(tsk, &audit_sig_sid); | |
c2f0c7c3 SG |
1727 | } |
1728 | } |