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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. |
b63862f4 | 6 | * Copyright (C) 2005 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 | * | |
b63862f4 DK |
32 | * The support of additional filter rules compares (>, <, >=, <=) was |
33 | * added by Dustin Kirkland <dustin.kirkland@us.ibm.com>, 2005. | |
34 | * | |
73241ccc AG |
35 | * Modified by Amy Griffis <amy.griffis@hp.com> to collect additional |
36 | * filesystem information. | |
8c8570fb DK |
37 | * |
38 | * Subject and object context labeling support added by <danjones@us.ibm.com> | |
39 | * and <dustin.kirkland@us.ibm.com> for LSPP certification compliance. | |
1da177e4 LT |
40 | */ |
41 | ||
42 | #include <linux/init.h> | |
1da177e4 | 43 | #include <asm/types.h> |
715b49ef | 44 | #include <asm/atomic.h> |
73241ccc AG |
45 | #include <asm/types.h> |
46 | #include <linux/fs.h> | |
47 | #include <linux/namei.h> | |
1da177e4 LT |
48 | #include <linux/mm.h> |
49 | #include <linux/module.h> | |
01116105 | 50 | #include <linux/mount.h> |
3ec3b2fb | 51 | #include <linux/socket.h> |
1da177e4 LT |
52 | #include <linux/audit.h> |
53 | #include <linux/personality.h> | |
54 | #include <linux/time.h> | |
5bb289b5 | 55 | #include <linux/netlink.h> |
f5561964 | 56 | #include <linux/compiler.h> |
1da177e4 | 57 | #include <asm/unistd.h> |
8c8570fb | 58 | #include <linux/security.h> |
fe7752ba | 59 | #include <linux/list.h> |
a6c043a8 | 60 | #include <linux/tty.h> |
3dc7e315 | 61 | #include <linux/selinux.h> |
1da177e4 | 62 | |
fe7752ba | 63 | #include "audit.h" |
1da177e4 | 64 | |
fe7752ba | 65 | extern struct list_head audit_filter_list[]; |
1da177e4 LT |
66 | |
67 | /* No syscall auditing will take place unless audit_enabled != 0. */ | |
68 | extern int audit_enabled; | |
69 | ||
70 | /* AUDIT_NAMES is the number of slots we reserve in the audit_context | |
71 | * for saving names from getname(). */ | |
72 | #define AUDIT_NAMES 20 | |
73 | ||
74 | /* AUDIT_NAMES_RESERVED is the number of slots we reserve in the | |
75 | * audit_context from being used for nameless inodes from | |
76 | * path_lookup. */ | |
77 | #define AUDIT_NAMES_RESERVED 7 | |
78 | ||
1da177e4 LT |
79 | /* When fs/namei.c:getname() is called, we store the pointer in name and |
80 | * we don't let putname() free it (instead we free all of the saved | |
81 | * pointers at syscall exit time). | |
82 | * | |
83 | * Further, in fs/namei.c:path_lookup() we store the inode and device. */ | |
84 | struct audit_names { | |
85 | const char *name; | |
86 | unsigned long ino; | |
73241ccc | 87 | unsigned long pino; |
1da177e4 LT |
88 | dev_t dev; |
89 | umode_t mode; | |
90 | uid_t uid; | |
91 | gid_t gid; | |
92 | dev_t rdev; | |
1b50eed9 | 93 | u32 osid; |
1da177e4 LT |
94 | }; |
95 | ||
96 | struct audit_aux_data { | |
97 | struct audit_aux_data *next; | |
98 | int type; | |
99 | }; | |
100 | ||
101 | #define AUDIT_AUX_IPCPERM 0 | |
102 | ||
103 | struct audit_aux_data_ipcctl { | |
104 | struct audit_aux_data d; | |
105 | struct ipc_perm p; | |
106 | unsigned long qbytes; | |
107 | uid_t uid; | |
108 | gid_t gid; | |
109 | mode_t mode; | |
9c7aa6aa | 110 | u32 osid; |
1da177e4 LT |
111 | }; |
112 | ||
3ec3b2fb DW |
113 | struct audit_aux_data_socketcall { |
114 | struct audit_aux_data d; | |
115 | int nargs; | |
116 | unsigned long args[0]; | |
117 | }; | |
118 | ||
119 | struct audit_aux_data_sockaddr { | |
120 | struct audit_aux_data d; | |
121 | int len; | |
122 | char a[0]; | |
123 | }; | |
124 | ||
01116105 SS |
125 | struct audit_aux_data_path { |
126 | struct audit_aux_data d; | |
127 | struct dentry *dentry; | |
128 | struct vfsmount *mnt; | |
129 | }; | |
1da177e4 LT |
130 | |
131 | /* The per-task audit context. */ | |
132 | struct audit_context { | |
133 | int in_syscall; /* 1 if task is in a syscall */ | |
134 | enum audit_state state; | |
135 | unsigned int serial; /* serial number for record */ | |
136 | struct timespec ctime; /* time of syscall entry */ | |
137 | uid_t loginuid; /* login uid (identity) */ | |
138 | int major; /* syscall number */ | |
139 | unsigned long argv[4]; /* syscall arguments */ | |
140 | int return_valid; /* return code is valid */ | |
2fd6f58b | 141 | long return_code;/* syscall return code */ |
1da177e4 LT |
142 | int auditable; /* 1 if record should be written */ |
143 | int name_count; | |
144 | struct audit_names names[AUDIT_NAMES]; | |
8f37d47c DW |
145 | struct dentry * pwd; |
146 | struct vfsmount * pwdmnt; | |
1da177e4 LT |
147 | struct audit_context *previous; /* For nested syscalls */ |
148 | struct audit_aux_data *aux; | |
149 | ||
150 | /* Save things to print about task_struct */ | |
151 | pid_t pid; | |
152 | uid_t uid, euid, suid, fsuid; | |
153 | gid_t gid, egid, sgid, fsgid; | |
154 | unsigned long personality; | |
2fd6f58b | 155 | int arch; |
1da177e4 LT |
156 | |
157 | #if AUDIT_DEBUG | |
158 | int put_count; | |
159 | int ino_count; | |
160 | #endif | |
161 | }; | |
162 | ||
1da177e4 LT |
163 | |
164 | /* Compare a task_struct with an audit_rule. Return 1 on match, 0 | |
165 | * otherwise. */ | |
166 | static int audit_filter_rules(struct task_struct *tsk, | |
93315ed6 | 167 | struct audit_krule *rule, |
1da177e4 LT |
168 | struct audit_context *ctx, |
169 | enum audit_state *state) | |
170 | { | |
2ad312d2 | 171 | int i, j, need_sid = 1; |
3dc7e315 DG |
172 | u32 sid; |
173 | ||
1da177e4 | 174 | for (i = 0; i < rule->field_count; i++) { |
93315ed6 | 175 | struct audit_field *f = &rule->fields[i]; |
1da177e4 LT |
176 | int result = 0; |
177 | ||
93315ed6 | 178 | switch (f->type) { |
1da177e4 | 179 | case AUDIT_PID: |
93315ed6 | 180 | result = audit_comparator(tsk->pid, f->op, f->val); |
1da177e4 LT |
181 | break; |
182 | case AUDIT_UID: | |
93315ed6 | 183 | result = audit_comparator(tsk->uid, f->op, f->val); |
1da177e4 LT |
184 | break; |
185 | case AUDIT_EUID: | |
93315ed6 | 186 | result = audit_comparator(tsk->euid, f->op, f->val); |
1da177e4 LT |
187 | break; |
188 | case AUDIT_SUID: | |
93315ed6 | 189 | result = audit_comparator(tsk->suid, f->op, f->val); |
1da177e4 LT |
190 | break; |
191 | case AUDIT_FSUID: | |
93315ed6 | 192 | result = audit_comparator(tsk->fsuid, f->op, f->val); |
1da177e4 LT |
193 | break; |
194 | case AUDIT_GID: | |
93315ed6 | 195 | result = audit_comparator(tsk->gid, f->op, f->val); |
1da177e4 LT |
196 | break; |
197 | case AUDIT_EGID: | |
93315ed6 | 198 | result = audit_comparator(tsk->egid, f->op, f->val); |
1da177e4 LT |
199 | break; |
200 | case AUDIT_SGID: | |
93315ed6 | 201 | result = audit_comparator(tsk->sgid, f->op, f->val); |
1da177e4 LT |
202 | break; |
203 | case AUDIT_FSGID: | |
93315ed6 | 204 | result = audit_comparator(tsk->fsgid, f->op, f->val); |
1da177e4 LT |
205 | break; |
206 | case AUDIT_PERS: | |
93315ed6 | 207 | result = audit_comparator(tsk->personality, f->op, f->val); |
1da177e4 | 208 | break; |
2fd6f58b | 209 | case AUDIT_ARCH: |
b63862f4 | 210 | if (ctx) |
93315ed6 | 211 | result = audit_comparator(ctx->arch, f->op, f->val); |
2fd6f58b | 212 | break; |
1da177e4 LT |
213 | |
214 | case AUDIT_EXIT: | |
215 | if (ctx && ctx->return_valid) | |
93315ed6 | 216 | result = audit_comparator(ctx->return_code, f->op, f->val); |
1da177e4 LT |
217 | break; |
218 | case AUDIT_SUCCESS: | |
b01f2cc1 | 219 | if (ctx && ctx->return_valid) { |
93315ed6 AG |
220 | if (f->val) |
221 | result = audit_comparator(ctx->return_valid, f->op, AUDITSC_SUCCESS); | |
b01f2cc1 | 222 | else |
93315ed6 | 223 | result = audit_comparator(ctx->return_valid, f->op, AUDITSC_FAILURE); |
b01f2cc1 | 224 | } |
1da177e4 LT |
225 | break; |
226 | case AUDIT_DEVMAJOR: | |
227 | if (ctx) { | |
228 | for (j = 0; j < ctx->name_count; j++) { | |
93315ed6 | 229 | if (audit_comparator(MAJOR(ctx->names[j].dev), f->op, f->val)) { |
1da177e4 LT |
230 | ++result; |
231 | break; | |
232 | } | |
233 | } | |
234 | } | |
235 | break; | |
236 | case AUDIT_DEVMINOR: | |
237 | if (ctx) { | |
238 | for (j = 0; j < ctx->name_count; j++) { | |
93315ed6 | 239 | if (audit_comparator(MINOR(ctx->names[j].dev), f->op, f->val)) { |
1da177e4 LT |
240 | ++result; |
241 | break; | |
242 | } | |
243 | } | |
244 | } | |
245 | break; | |
246 | case AUDIT_INODE: | |
247 | if (ctx) { | |
248 | for (j = 0; j < ctx->name_count; j++) { | |
93315ed6 AG |
249 | if (audit_comparator(ctx->names[j].ino, f->op, f->val) || |
250 | audit_comparator(ctx->names[j].pino, f->op, f->val)) { | |
1da177e4 LT |
251 | ++result; |
252 | break; | |
253 | } | |
254 | } | |
255 | } | |
256 | break; | |
257 | case AUDIT_LOGINUID: | |
258 | result = 0; | |
259 | if (ctx) | |
93315ed6 | 260 | result = audit_comparator(ctx->loginuid, f->op, f->val); |
1da177e4 | 261 | break; |
3dc7e315 DG |
262 | case AUDIT_SE_USER: |
263 | case AUDIT_SE_ROLE: | |
264 | case AUDIT_SE_TYPE: | |
265 | case AUDIT_SE_SEN: | |
266 | case AUDIT_SE_CLR: | |
267 | /* NOTE: this may return negative values indicating | |
268 | a temporary error. We simply treat this as a | |
269 | match for now to avoid losing information that | |
270 | may be wanted. An error message will also be | |
271 | logged upon error */ | |
2ad312d2 SG |
272 | if (f->se_rule) { |
273 | if (need_sid) { | |
274 | selinux_task_ctxid(tsk, &sid); | |
275 | need_sid = 0; | |
276 | } | |
3dc7e315 DG |
277 | result = selinux_audit_rule_match(sid, f->type, |
278 | f->op, | |
279 | f->se_rule, | |
280 | ctx); | |
2ad312d2 | 281 | } |
3dc7e315 | 282 | break; |
1da177e4 LT |
283 | case AUDIT_ARG0: |
284 | case AUDIT_ARG1: | |
285 | case AUDIT_ARG2: | |
286 | case AUDIT_ARG3: | |
287 | if (ctx) | |
93315ed6 | 288 | result = audit_comparator(ctx->argv[f->type-AUDIT_ARG0], f->op, f->val); |
1da177e4 LT |
289 | break; |
290 | } | |
291 | ||
1da177e4 LT |
292 | if (!result) |
293 | return 0; | |
294 | } | |
295 | switch (rule->action) { | |
296 | case AUDIT_NEVER: *state = AUDIT_DISABLED; break; | |
297 | case AUDIT_POSSIBLE: *state = AUDIT_BUILD_CONTEXT; break; | |
298 | case AUDIT_ALWAYS: *state = AUDIT_RECORD_CONTEXT; break; | |
299 | } | |
300 | return 1; | |
301 | } | |
302 | ||
303 | /* At process creation time, we can determine if system-call auditing is | |
304 | * completely disabled for this task. Since we only have the task | |
305 | * structure at this point, we can only check uid and gid. | |
306 | */ | |
307 | static enum audit_state audit_filter_task(struct task_struct *tsk) | |
308 | { | |
309 | struct audit_entry *e; | |
310 | enum audit_state state; | |
311 | ||
312 | rcu_read_lock(); | |
0f45aa18 | 313 | list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_TASK], list) { |
1da177e4 LT |
314 | if (audit_filter_rules(tsk, &e->rule, NULL, &state)) { |
315 | rcu_read_unlock(); | |
316 | return state; | |
317 | } | |
318 | } | |
319 | rcu_read_unlock(); | |
320 | return AUDIT_BUILD_CONTEXT; | |
321 | } | |
322 | ||
323 | /* At syscall entry and exit time, this filter is called if the | |
324 | * audit_state is not low enough that auditing cannot take place, but is | |
23f32d18 | 325 | * also not high enough that we already know we have to write an audit |
b0dd25a8 | 326 | * record (i.e., the state is AUDIT_SETUP_CONTEXT or AUDIT_BUILD_CONTEXT). |
1da177e4 LT |
327 | */ |
328 | static enum audit_state audit_filter_syscall(struct task_struct *tsk, | |
329 | struct audit_context *ctx, | |
330 | struct list_head *list) | |
331 | { | |
332 | struct audit_entry *e; | |
c3896495 | 333 | enum audit_state state; |
1da177e4 | 334 | |
351bb722 | 335 | if (audit_pid && tsk->tgid == audit_pid) |
f7056d64 DW |
336 | return AUDIT_DISABLED; |
337 | ||
1da177e4 | 338 | rcu_read_lock(); |
c3896495 | 339 | if (!list_empty(list)) { |
b63862f4 DK |
340 | int word = AUDIT_WORD(ctx->major); |
341 | int bit = AUDIT_BIT(ctx->major); | |
342 | ||
343 | list_for_each_entry_rcu(e, list, list) { | |
344 | if ((e->rule.mask[word] & bit) == bit | |
345 | && audit_filter_rules(tsk, &e->rule, ctx, &state)) { | |
346 | rcu_read_unlock(); | |
347 | return state; | |
348 | } | |
0f45aa18 DW |
349 | } |
350 | } | |
351 | rcu_read_unlock(); | |
1da177e4 | 352 | return AUDIT_BUILD_CONTEXT; |
0f45aa18 DW |
353 | } |
354 | ||
1da177e4 LT |
355 | static inline struct audit_context *audit_get_context(struct task_struct *tsk, |
356 | int return_valid, | |
357 | int return_code) | |
358 | { | |
359 | struct audit_context *context = tsk->audit_context; | |
360 | ||
361 | if (likely(!context)) | |
362 | return NULL; | |
363 | context->return_valid = return_valid; | |
364 | context->return_code = return_code; | |
365 | ||
21af6c4f | 366 | if (context->in_syscall && !context->auditable) { |
1da177e4 | 367 | enum audit_state state; |
0f45aa18 | 368 | state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_EXIT]); |
1da177e4 LT |
369 | if (state == AUDIT_RECORD_CONTEXT) |
370 | context->auditable = 1; | |
371 | } | |
372 | ||
373 | context->pid = tsk->pid; | |
374 | context->uid = tsk->uid; | |
375 | context->gid = tsk->gid; | |
376 | context->euid = tsk->euid; | |
377 | context->suid = tsk->suid; | |
378 | context->fsuid = tsk->fsuid; | |
379 | context->egid = tsk->egid; | |
380 | context->sgid = tsk->sgid; | |
381 | context->fsgid = tsk->fsgid; | |
382 | context->personality = tsk->personality; | |
383 | tsk->audit_context = NULL; | |
384 | return context; | |
385 | } | |
386 | ||
387 | static inline void audit_free_names(struct audit_context *context) | |
388 | { | |
389 | int i; | |
390 | ||
391 | #if AUDIT_DEBUG == 2 | |
392 | if (context->auditable | |
393 | ||context->put_count + context->ino_count != context->name_count) { | |
73241ccc | 394 | printk(KERN_ERR "%s:%d(:%d): major=%d in_syscall=%d" |
1da177e4 LT |
395 | " name_count=%d put_count=%d" |
396 | " ino_count=%d [NOT freeing]\n", | |
73241ccc | 397 | __FILE__, __LINE__, |
1da177e4 LT |
398 | context->serial, context->major, context->in_syscall, |
399 | context->name_count, context->put_count, | |
400 | context->ino_count); | |
8c8570fb | 401 | for (i = 0; i < context->name_count; i++) { |
1da177e4 LT |
402 | printk(KERN_ERR "names[%d] = %p = %s\n", i, |
403 | context->names[i].name, | |
73241ccc | 404 | context->names[i].name ?: "(null)"); |
8c8570fb | 405 | } |
1da177e4 LT |
406 | dump_stack(); |
407 | return; | |
408 | } | |
409 | #endif | |
410 | #if AUDIT_DEBUG | |
411 | context->put_count = 0; | |
412 | context->ino_count = 0; | |
413 | #endif | |
414 | ||
8c8570fb | 415 | for (i = 0; i < context->name_count; i++) { |
1da177e4 LT |
416 | if (context->names[i].name) |
417 | __putname(context->names[i].name); | |
8c8570fb | 418 | } |
1da177e4 | 419 | context->name_count = 0; |
8f37d47c DW |
420 | if (context->pwd) |
421 | dput(context->pwd); | |
422 | if (context->pwdmnt) | |
423 | mntput(context->pwdmnt); | |
424 | context->pwd = NULL; | |
425 | context->pwdmnt = NULL; | |
1da177e4 LT |
426 | } |
427 | ||
428 | static inline void audit_free_aux(struct audit_context *context) | |
429 | { | |
430 | struct audit_aux_data *aux; | |
431 | ||
432 | while ((aux = context->aux)) { | |
01116105 SS |
433 | if (aux->type == AUDIT_AVC_PATH) { |
434 | struct audit_aux_data_path *axi = (void *)aux; | |
435 | dput(axi->dentry); | |
436 | mntput(axi->mnt); | |
437 | } | |
8c8570fb | 438 | |
1da177e4 LT |
439 | context->aux = aux->next; |
440 | kfree(aux); | |
441 | } | |
442 | } | |
443 | ||
444 | static inline void audit_zero_context(struct audit_context *context, | |
445 | enum audit_state state) | |
446 | { | |
447 | uid_t loginuid = context->loginuid; | |
448 | ||
449 | memset(context, 0, sizeof(*context)); | |
450 | context->state = state; | |
451 | context->loginuid = loginuid; | |
452 | } | |
453 | ||
454 | static inline struct audit_context *audit_alloc_context(enum audit_state state) | |
455 | { | |
456 | struct audit_context *context; | |
457 | ||
458 | if (!(context = kmalloc(sizeof(*context), GFP_KERNEL))) | |
459 | return NULL; | |
460 | audit_zero_context(context, state); | |
461 | return context; | |
462 | } | |
463 | ||
b0dd25a8 RD |
464 | /** |
465 | * audit_alloc - allocate an audit context block for a task | |
466 | * @tsk: task | |
467 | * | |
468 | * Filter on the task information and allocate a per-task audit context | |
1da177e4 LT |
469 | * if necessary. Doing so turns on system call auditing for the |
470 | * specified task. This is called from copy_process, so no lock is | |
b0dd25a8 RD |
471 | * needed. |
472 | */ | |
1da177e4 LT |
473 | int audit_alloc(struct task_struct *tsk) |
474 | { | |
475 | struct audit_context *context; | |
476 | enum audit_state state; | |
477 | ||
478 | if (likely(!audit_enabled)) | |
479 | return 0; /* Return if not auditing. */ | |
480 | ||
481 | state = audit_filter_task(tsk); | |
482 | if (likely(state == AUDIT_DISABLED)) | |
483 | return 0; | |
484 | ||
485 | if (!(context = audit_alloc_context(state))) { | |
486 | audit_log_lost("out of memory in audit_alloc"); | |
487 | return -ENOMEM; | |
488 | } | |
489 | ||
490 | /* Preserve login uid */ | |
491 | context->loginuid = -1; | |
492 | if (current->audit_context) | |
493 | context->loginuid = current->audit_context->loginuid; | |
494 | ||
495 | tsk->audit_context = context; | |
496 | set_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT); | |
497 | return 0; | |
498 | } | |
499 | ||
500 | static inline void audit_free_context(struct audit_context *context) | |
501 | { | |
502 | struct audit_context *previous; | |
503 | int count = 0; | |
504 | ||
505 | do { | |
506 | previous = context->previous; | |
507 | if (previous || (count && count < 10)) { | |
508 | ++count; | |
509 | printk(KERN_ERR "audit(:%d): major=%d name_count=%d:" | |
510 | " freeing multiple contexts (%d)\n", | |
511 | context->serial, context->major, | |
512 | context->name_count, count); | |
513 | } | |
514 | audit_free_names(context); | |
515 | audit_free_aux(context); | |
516 | kfree(context); | |
517 | context = previous; | |
518 | } while (context); | |
519 | if (count >= 10) | |
520 | printk(KERN_ERR "audit: freed %d contexts\n", count); | |
521 | } | |
522 | ||
e495149b | 523 | static void audit_log_task_context(struct audit_buffer *ab) |
8c8570fb DK |
524 | { |
525 | char *ctx = NULL; | |
526 | ssize_t len = 0; | |
527 | ||
528 | len = security_getprocattr(current, "current", NULL, 0); | |
529 | if (len < 0) { | |
530 | if (len != -EINVAL) | |
531 | goto error_path; | |
532 | return; | |
533 | } | |
534 | ||
e495149b | 535 | ctx = kmalloc(len, GFP_KERNEL); |
7306a0b9 | 536 | if (!ctx) |
8c8570fb | 537 | goto error_path; |
8c8570fb DK |
538 | |
539 | len = security_getprocattr(current, "current", ctx, len); | |
540 | if (len < 0 ) | |
541 | goto error_path; | |
542 | ||
543 | audit_log_format(ab, " subj=%s", ctx); | |
7306a0b9 | 544 | return; |
8c8570fb DK |
545 | |
546 | error_path: | |
547 | if (ctx) | |
548 | kfree(ctx); | |
7306a0b9 | 549 | audit_panic("error in audit_log_task_context"); |
8c8570fb DK |
550 | return; |
551 | } | |
552 | ||
e495149b | 553 | static void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk) |
219f0817 | 554 | { |
45d9bb0e AV |
555 | char name[sizeof(tsk->comm)]; |
556 | struct mm_struct *mm = tsk->mm; | |
219f0817 SS |
557 | struct vm_area_struct *vma; |
558 | ||
e495149b AV |
559 | /* tsk == current */ |
560 | ||
45d9bb0e | 561 | get_task_comm(name, tsk); |
99e45eea DW |
562 | audit_log_format(ab, " comm="); |
563 | audit_log_untrustedstring(ab, name); | |
219f0817 | 564 | |
e495149b AV |
565 | if (mm) { |
566 | down_read(&mm->mmap_sem); | |
567 | vma = mm->mmap; | |
568 | while (vma) { | |
569 | if ((vma->vm_flags & VM_EXECUTABLE) && | |
570 | vma->vm_file) { | |
571 | audit_log_d_path(ab, "exe=", | |
572 | vma->vm_file->f_dentry, | |
573 | vma->vm_file->f_vfsmnt); | |
574 | break; | |
575 | } | |
576 | vma = vma->vm_next; | |
219f0817 | 577 | } |
e495149b | 578 | up_read(&mm->mmap_sem); |
219f0817 | 579 | } |
e495149b | 580 | audit_log_task_context(ab); |
219f0817 SS |
581 | } |
582 | ||
e495149b | 583 | static void audit_log_exit(struct audit_context *context, struct task_struct *tsk) |
1da177e4 | 584 | { |
9c7aa6aa | 585 | int i, call_panic = 0; |
1da177e4 | 586 | struct audit_buffer *ab; |
7551ced3 | 587 | struct audit_aux_data *aux; |
a6c043a8 | 588 | const char *tty; |
1da177e4 | 589 | |
e495149b AV |
590 | /* tsk == current */ |
591 | ||
592 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_SYSCALL); | |
1da177e4 LT |
593 | if (!ab) |
594 | return; /* audit_panic has been called */ | |
bccf6ae0 DW |
595 | audit_log_format(ab, "arch=%x syscall=%d", |
596 | context->arch, context->major); | |
1da177e4 LT |
597 | if (context->personality != PER_LINUX) |
598 | audit_log_format(ab, " per=%lx", context->personality); | |
599 | if (context->return_valid) | |
2fd6f58b DW |
600 | audit_log_format(ab, " success=%s exit=%ld", |
601 | (context->return_valid==AUDITSC_SUCCESS)?"yes":"no", | |
602 | context->return_code); | |
45d9bb0e AV |
603 | if (tsk->signal && tsk->signal->tty && tsk->signal->tty->name) |
604 | tty = tsk->signal->tty->name; | |
a6c043a8 SG |
605 | else |
606 | tty = "(none)"; | |
1da177e4 LT |
607 | audit_log_format(ab, |
608 | " a0=%lx a1=%lx a2=%lx a3=%lx items=%d" | |
326e9c8b SG |
609 | " pid=%d auid=%u uid=%u gid=%u" |
610 | " euid=%u suid=%u fsuid=%u" | |
a6c043a8 | 611 | " egid=%u sgid=%u fsgid=%u tty=%s", |
1da177e4 LT |
612 | context->argv[0], |
613 | context->argv[1], | |
614 | context->argv[2], | |
615 | context->argv[3], | |
616 | context->name_count, | |
617 | context->pid, | |
618 | context->loginuid, | |
619 | context->uid, | |
620 | context->gid, | |
621 | context->euid, context->suid, context->fsuid, | |
a6c043a8 | 622 | context->egid, context->sgid, context->fsgid, tty); |
e495149b | 623 | audit_log_task_info(ab, tsk); |
1da177e4 | 624 | audit_log_end(ab); |
1da177e4 | 625 | |
7551ced3 | 626 | for (aux = context->aux; aux; aux = aux->next) { |
c0404993 | 627 | |
e495149b | 628 | ab = audit_log_start(context, GFP_KERNEL, aux->type); |
1da177e4 LT |
629 | if (!ab) |
630 | continue; /* audit_panic has been called */ | |
631 | ||
1da177e4 | 632 | switch (aux->type) { |
c0404993 | 633 | case AUDIT_IPC: { |
1da177e4 LT |
634 | struct audit_aux_data_ipcctl *axi = (void *)aux; |
635 | audit_log_format(ab, | |
9c7aa6aa SG |
636 | " qbytes=%lx iuid=%u igid=%u mode=%x", |
637 | axi->qbytes, axi->uid, axi->gid, axi->mode); | |
638 | if (axi->osid != 0) { | |
639 | char *ctx = NULL; | |
640 | u32 len; | |
641 | if (selinux_ctxid_to_string( | |
642 | axi->osid, &ctx, &len)) { | |
ce29b682 | 643 | audit_log_format(ab, " osid=%u", |
9c7aa6aa SG |
644 | axi->osid); |
645 | call_panic = 1; | |
646 | } else | |
647 | audit_log_format(ab, " obj=%s", ctx); | |
648 | kfree(ctx); | |
649 | } | |
3ec3b2fb DW |
650 | break; } |
651 | ||
073115d6 SG |
652 | case AUDIT_IPC_SET_PERM: { |
653 | struct audit_aux_data_ipcctl *axi = (void *)aux; | |
654 | audit_log_format(ab, | |
655 | " new qbytes=%lx new iuid=%u new igid=%u new mode=%x", | |
656 | axi->qbytes, axi->uid, axi->gid, axi->mode); | |
657 | if (axi->osid != 0) { | |
658 | char *ctx = NULL; | |
659 | u32 len; | |
660 | if (selinux_ctxid_to_string( | |
661 | axi->osid, &ctx, &len)) { | |
662 | audit_log_format(ab, " osid=%u", | |
663 | axi->osid); | |
664 | call_panic = 1; | |
665 | } else | |
666 | audit_log_format(ab, " obj=%s", ctx); | |
667 | kfree(ctx); | |
668 | } | |
669 | break; } | |
670 | ||
3ec3b2fb DW |
671 | case AUDIT_SOCKETCALL: { |
672 | int i; | |
673 | struct audit_aux_data_socketcall *axs = (void *)aux; | |
674 | audit_log_format(ab, "nargs=%d", axs->nargs); | |
675 | for (i=0; i<axs->nargs; i++) | |
676 | audit_log_format(ab, " a%d=%lx", i, axs->args[i]); | |
677 | break; } | |
678 | ||
679 | case AUDIT_SOCKADDR: { | |
680 | struct audit_aux_data_sockaddr *axs = (void *)aux; | |
681 | ||
682 | audit_log_format(ab, "saddr="); | |
683 | audit_log_hex(ab, axs->a, axs->len); | |
684 | break; } | |
01116105 SS |
685 | |
686 | case AUDIT_AVC_PATH: { | |
687 | struct audit_aux_data_path *axi = (void *)aux; | |
688 | audit_log_d_path(ab, "path=", axi->dentry, axi->mnt); | |
01116105 SS |
689 | break; } |
690 | ||
1da177e4 LT |
691 | } |
692 | audit_log_end(ab); | |
1da177e4 LT |
693 | } |
694 | ||
8f37d47c | 695 | if (context->pwd && context->pwdmnt) { |
e495149b | 696 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD); |
8f37d47c DW |
697 | if (ab) { |
698 | audit_log_d_path(ab, "cwd=", context->pwd, context->pwdmnt); | |
699 | audit_log_end(ab); | |
700 | } | |
701 | } | |
1da177e4 | 702 | for (i = 0; i < context->name_count; i++) { |
73241ccc AG |
703 | unsigned long ino = context->names[i].ino; |
704 | unsigned long pino = context->names[i].pino; | |
705 | ||
e495149b | 706 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_PATH); |
1da177e4 LT |
707 | if (!ab) |
708 | continue; /* audit_panic has been called */ | |
8f37d47c | 709 | |
1da177e4 | 710 | audit_log_format(ab, "item=%d", i); |
73241ccc AG |
711 | |
712 | audit_log_format(ab, " name="); | |
713 | if (context->names[i].name) | |
83c7d091 | 714 | audit_log_untrustedstring(ab, context->names[i].name); |
73241ccc AG |
715 | else |
716 | audit_log_format(ab, "(null)"); | |
717 | ||
718 | if (pino != (unsigned long)-1) | |
719 | audit_log_format(ab, " parent=%lu", pino); | |
720 | if (ino != (unsigned long)-1) | |
721 | audit_log_format(ab, " inode=%lu", ino); | |
722 | if ((pino != (unsigned long)-1) || (ino != (unsigned long)-1)) | |
723 | audit_log_format(ab, " dev=%02x:%02x mode=%#o" | |
724 | " ouid=%u ogid=%u rdev=%02x:%02x", | |
725 | MAJOR(context->names[i].dev), | |
726 | MINOR(context->names[i].dev), | |
727 | context->names[i].mode, | |
728 | context->names[i].uid, | |
729 | context->names[i].gid, | |
730 | MAJOR(context->names[i].rdev), | |
1da177e4 | 731 | MINOR(context->names[i].rdev)); |
1b50eed9 SG |
732 | if (context->names[i].osid != 0) { |
733 | char *ctx = NULL; | |
734 | u32 len; | |
735 | if (selinux_ctxid_to_string( | |
736 | context->names[i].osid, &ctx, &len)) { | |
ce29b682 | 737 | audit_log_format(ab, " osid=%u", |
1b50eed9 | 738 | context->names[i].osid); |
9c7aa6aa | 739 | call_panic = 2; |
1b50eed9 SG |
740 | } else |
741 | audit_log_format(ab, " obj=%s", ctx); | |
742 | kfree(ctx); | |
8c8570fb DK |
743 | } |
744 | ||
1da177e4 LT |
745 | audit_log_end(ab); |
746 | } | |
9c7aa6aa SG |
747 | if (call_panic) |
748 | audit_panic("error converting sid to string"); | |
1da177e4 LT |
749 | } |
750 | ||
b0dd25a8 RD |
751 | /** |
752 | * audit_free - free a per-task audit context | |
753 | * @tsk: task whose audit context block to free | |
754 | * | |
fa84cb93 | 755 | * Called from copy_process and do_exit |
b0dd25a8 | 756 | */ |
1da177e4 LT |
757 | void audit_free(struct task_struct *tsk) |
758 | { | |
759 | struct audit_context *context; | |
760 | ||
1da177e4 | 761 | context = audit_get_context(tsk, 0, 0); |
1da177e4 LT |
762 | if (likely(!context)) |
763 | return; | |
764 | ||
765 | /* Check for system calls that do not go through the exit | |
f5561964 DW |
766 | * function (e.g., exit_group), then free context block. |
767 | * We use GFP_ATOMIC here because we might be doing this | |
768 | * in the context of the idle thread */ | |
e495149b | 769 | /* that can happen only if we are called from do_exit() */ |
f7056d64 | 770 | if (context->in_syscall && context->auditable) |
e495149b | 771 | audit_log_exit(context, tsk); |
1da177e4 LT |
772 | |
773 | audit_free_context(context); | |
774 | } | |
775 | ||
b0dd25a8 RD |
776 | /** |
777 | * audit_syscall_entry - fill in an audit record at syscall entry | |
778 | * @tsk: task being audited | |
779 | * @arch: architecture type | |
780 | * @major: major syscall type (function) | |
781 | * @a1: additional syscall register 1 | |
782 | * @a2: additional syscall register 2 | |
783 | * @a3: additional syscall register 3 | |
784 | * @a4: additional syscall register 4 | |
785 | * | |
786 | * Fill in audit context at syscall entry. This only happens if the | |
1da177e4 LT |
787 | * audit context was created when the task was created and the state or |
788 | * filters demand the audit context be built. If the state from the | |
789 | * per-task filter or from the per-syscall filter is AUDIT_RECORD_CONTEXT, | |
790 | * then the record will be written at syscall exit time (otherwise, it | |
791 | * will only be written if another part of the kernel requests that it | |
b0dd25a8 RD |
792 | * be written). |
793 | */ | |
5411be59 | 794 | void audit_syscall_entry(int arch, int major, |
1da177e4 LT |
795 | unsigned long a1, unsigned long a2, |
796 | unsigned long a3, unsigned long a4) | |
797 | { | |
5411be59 | 798 | struct task_struct *tsk = current; |
1da177e4 LT |
799 | struct audit_context *context = tsk->audit_context; |
800 | enum audit_state state; | |
801 | ||
802 | BUG_ON(!context); | |
803 | ||
b0dd25a8 RD |
804 | /* |
805 | * This happens only on certain architectures that make system | |
1da177e4 LT |
806 | * calls in kernel_thread via the entry.S interface, instead of |
807 | * with direct calls. (If you are porting to a new | |
808 | * architecture, hitting this condition can indicate that you | |
809 | * got the _exit/_leave calls backward in entry.S.) | |
810 | * | |
811 | * i386 no | |
812 | * x86_64 no | |
2ef9481e | 813 | * ppc64 yes (see arch/powerpc/platforms/iseries/misc.S) |
1da177e4 LT |
814 | * |
815 | * This also happens with vm86 emulation in a non-nested manner | |
816 | * (entries without exits), so this case must be caught. | |
817 | */ | |
818 | if (context->in_syscall) { | |
819 | struct audit_context *newctx; | |
820 | ||
1da177e4 LT |
821 | #if AUDIT_DEBUG |
822 | printk(KERN_ERR | |
823 | "audit(:%d) pid=%d in syscall=%d;" | |
824 | " entering syscall=%d\n", | |
825 | context->serial, tsk->pid, context->major, major); | |
826 | #endif | |
827 | newctx = audit_alloc_context(context->state); | |
828 | if (newctx) { | |
829 | newctx->previous = context; | |
830 | context = newctx; | |
831 | tsk->audit_context = newctx; | |
832 | } else { | |
833 | /* If we can't alloc a new context, the best we | |
834 | * can do is to leak memory (any pending putname | |
835 | * will be lost). The only other alternative is | |
836 | * to abandon auditing. */ | |
837 | audit_zero_context(context, context->state); | |
838 | } | |
839 | } | |
840 | BUG_ON(context->in_syscall || context->name_count); | |
841 | ||
842 | if (!audit_enabled) | |
843 | return; | |
844 | ||
2fd6f58b | 845 | context->arch = arch; |
1da177e4 LT |
846 | context->major = major; |
847 | context->argv[0] = a1; | |
848 | context->argv[1] = a2; | |
849 | context->argv[2] = a3; | |
850 | context->argv[3] = a4; | |
851 | ||
852 | state = context->state; | |
853 | if (state == AUDIT_SETUP_CONTEXT || state == AUDIT_BUILD_CONTEXT) | |
0f45aa18 | 854 | state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_ENTRY]); |
1da177e4 LT |
855 | if (likely(state == AUDIT_DISABLED)) |
856 | return; | |
857 | ||
ce625a80 | 858 | context->serial = 0; |
1da177e4 LT |
859 | context->ctime = CURRENT_TIME; |
860 | context->in_syscall = 1; | |
861 | context->auditable = !!(state == AUDIT_RECORD_CONTEXT); | |
862 | } | |
863 | ||
b0dd25a8 RD |
864 | /** |
865 | * audit_syscall_exit - deallocate audit context after a system call | |
866 | * @tsk: task being audited | |
867 | * @valid: success/failure flag | |
868 | * @return_code: syscall return value | |
869 | * | |
870 | * Tear down after system call. If the audit context has been marked as | |
1da177e4 LT |
871 | * auditable (either because of the AUDIT_RECORD_CONTEXT state from |
872 | * filtering, or because some other part of the kernel write an audit | |
873 | * message), then write out the syscall information. In call cases, | |
b0dd25a8 RD |
874 | * free the names stored from getname(). |
875 | */ | |
5411be59 | 876 | void audit_syscall_exit(int valid, long return_code) |
1da177e4 | 877 | { |
5411be59 | 878 | struct task_struct *tsk = current; |
1da177e4 LT |
879 | struct audit_context *context; |
880 | ||
2fd6f58b | 881 | context = audit_get_context(tsk, valid, return_code); |
1da177e4 | 882 | |
1da177e4 | 883 | if (likely(!context)) |
97e94c45 | 884 | return; |
1da177e4 | 885 | |
f7056d64 | 886 | if (context->in_syscall && context->auditable) |
e495149b | 887 | audit_log_exit(context, tsk); |
1da177e4 LT |
888 | |
889 | context->in_syscall = 0; | |
890 | context->auditable = 0; | |
2fd6f58b | 891 | |
1da177e4 LT |
892 | if (context->previous) { |
893 | struct audit_context *new_context = context->previous; | |
894 | context->previous = NULL; | |
895 | audit_free_context(context); | |
896 | tsk->audit_context = new_context; | |
897 | } else { | |
898 | audit_free_names(context); | |
899 | audit_free_aux(context); | |
1da177e4 LT |
900 | tsk->audit_context = context; |
901 | } | |
1da177e4 LT |
902 | } |
903 | ||
b0dd25a8 RD |
904 | /** |
905 | * audit_getname - add a name to the list | |
906 | * @name: name to add | |
907 | * | |
908 | * Add a name to the list of audit names for this context. | |
909 | * Called from fs/namei.c:getname(). | |
910 | */ | |
1da177e4 LT |
911 | void audit_getname(const char *name) |
912 | { | |
913 | struct audit_context *context = current->audit_context; | |
914 | ||
915 | if (!context || IS_ERR(name) || !name) | |
916 | return; | |
917 | ||
918 | if (!context->in_syscall) { | |
919 | #if AUDIT_DEBUG == 2 | |
920 | printk(KERN_ERR "%s:%d(:%d): ignoring getname(%p)\n", | |
921 | __FILE__, __LINE__, context->serial, name); | |
922 | dump_stack(); | |
923 | #endif | |
924 | return; | |
925 | } | |
926 | BUG_ON(context->name_count >= AUDIT_NAMES); | |
927 | context->names[context->name_count].name = name; | |
928 | context->names[context->name_count].ino = (unsigned long)-1; | |
929 | ++context->name_count; | |
8f37d47c DW |
930 | if (!context->pwd) { |
931 | read_lock(¤t->fs->lock); | |
932 | context->pwd = dget(current->fs->pwd); | |
933 | context->pwdmnt = mntget(current->fs->pwdmnt); | |
934 | read_unlock(¤t->fs->lock); | |
935 | } | |
936 | ||
1da177e4 LT |
937 | } |
938 | ||
b0dd25a8 RD |
939 | /* audit_putname - intercept a putname request |
940 | * @name: name to intercept and delay for putname | |
941 | * | |
942 | * If we have stored the name from getname in the audit context, | |
943 | * then we delay the putname until syscall exit. | |
944 | * Called from include/linux/fs.h:putname(). | |
945 | */ | |
1da177e4 LT |
946 | void audit_putname(const char *name) |
947 | { | |
948 | struct audit_context *context = current->audit_context; | |
949 | ||
950 | BUG_ON(!context); | |
951 | if (!context->in_syscall) { | |
952 | #if AUDIT_DEBUG == 2 | |
953 | printk(KERN_ERR "%s:%d(:%d): __putname(%p)\n", | |
954 | __FILE__, __LINE__, context->serial, name); | |
955 | if (context->name_count) { | |
956 | int i; | |
957 | for (i = 0; i < context->name_count; i++) | |
958 | printk(KERN_ERR "name[%d] = %p = %s\n", i, | |
959 | context->names[i].name, | |
73241ccc | 960 | context->names[i].name ?: "(null)"); |
1da177e4 LT |
961 | } |
962 | #endif | |
963 | __putname(name); | |
964 | } | |
965 | #if AUDIT_DEBUG | |
966 | else { | |
967 | ++context->put_count; | |
968 | if (context->put_count > context->name_count) { | |
969 | printk(KERN_ERR "%s:%d(:%d): major=%d" | |
970 | " in_syscall=%d putname(%p) name_count=%d" | |
971 | " put_count=%d\n", | |
972 | __FILE__, __LINE__, | |
973 | context->serial, context->major, | |
974 | context->in_syscall, name, context->name_count, | |
975 | context->put_count); | |
976 | dump_stack(); | |
977 | } | |
978 | } | |
979 | #endif | |
980 | } | |
981 | ||
9c7aa6aa | 982 | static void audit_inode_context(int idx, const struct inode *inode) |
8c8570fb DK |
983 | { |
984 | struct audit_context *context = current->audit_context; | |
8c8570fb | 985 | |
1b50eed9 | 986 | selinux_get_inode_sid(inode, &context->names[idx].osid); |
8c8570fb DK |
987 | } |
988 | ||
989 | ||
b0dd25a8 RD |
990 | /** |
991 | * audit_inode - store the inode and device from a lookup | |
992 | * @name: name being audited | |
993 | * @inode: inode being audited | |
994 | * @flags: lookup flags (as used in path_lookup()) | |
995 | * | |
996 | * Called from fs/namei.c:path_lookup(). | |
997 | */ | |
73241ccc | 998 | void __audit_inode(const char *name, const struct inode *inode, unsigned flags) |
1da177e4 LT |
999 | { |
1000 | int idx; | |
1001 | struct audit_context *context = current->audit_context; | |
1002 | ||
1003 | if (!context->in_syscall) | |
1004 | return; | |
1005 | if (context->name_count | |
1006 | && context->names[context->name_count-1].name | |
1007 | && context->names[context->name_count-1].name == name) | |
1008 | idx = context->name_count - 1; | |
1009 | else if (context->name_count > 1 | |
1010 | && context->names[context->name_count-2].name | |
1011 | && context->names[context->name_count-2].name == name) | |
1012 | idx = context->name_count - 2; | |
1013 | else { | |
1014 | /* FIXME: how much do we care about inodes that have no | |
1015 | * associated name? */ | |
1016 | if (context->name_count >= AUDIT_NAMES - AUDIT_NAMES_RESERVED) | |
1017 | return; | |
1018 | idx = context->name_count++; | |
1019 | context->names[idx].name = NULL; | |
1020 | #if AUDIT_DEBUG | |
1021 | ++context->ino_count; | |
1022 | #endif | |
1023 | } | |
ae7b961b DW |
1024 | context->names[idx].dev = inode->i_sb->s_dev; |
1025 | context->names[idx].mode = inode->i_mode; | |
1026 | context->names[idx].uid = inode->i_uid; | |
1027 | context->names[idx].gid = inode->i_gid; | |
1028 | context->names[idx].rdev = inode->i_rdev; | |
8c8570fb | 1029 | audit_inode_context(idx, inode); |
73241ccc AG |
1030 | if ((flags & LOOKUP_PARENT) && (strcmp(name, "/") != 0) && |
1031 | (strcmp(name, ".") != 0)) { | |
1032 | context->names[idx].ino = (unsigned long)-1; | |
1033 | context->names[idx].pino = inode->i_ino; | |
1034 | } else { | |
1035 | context->names[idx].ino = inode->i_ino; | |
1036 | context->names[idx].pino = (unsigned long)-1; | |
1037 | } | |
1038 | } | |
1039 | ||
1040 | /** | |
1041 | * audit_inode_child - collect inode info for created/removed objects | |
1042 | * @dname: inode's dentry name | |
1043 | * @inode: inode being audited | |
1044 | * @pino: inode number of dentry parent | |
1045 | * | |
1046 | * For syscalls that create or remove filesystem objects, audit_inode | |
1047 | * can only collect information for the filesystem object's parent. | |
1048 | * This call updates the audit context with the child's information. | |
1049 | * Syscalls that create a new filesystem object must be hooked after | |
1050 | * the object is created. Syscalls that remove a filesystem object | |
1051 | * must be hooked prior, in order to capture the target inode during | |
1052 | * unsuccessful attempts. | |
1053 | */ | |
1054 | void __audit_inode_child(const char *dname, const struct inode *inode, | |
1055 | unsigned long pino) | |
1056 | { | |
1057 | int idx; | |
1058 | struct audit_context *context = current->audit_context; | |
1059 | ||
1060 | if (!context->in_syscall) | |
1061 | return; | |
1062 | ||
1063 | /* determine matching parent */ | |
1064 | if (dname) | |
1065 | for (idx = 0; idx < context->name_count; idx++) | |
1066 | if (context->names[idx].pino == pino) { | |
1067 | const char *n; | |
1068 | const char *name = context->names[idx].name; | |
1069 | int dlen = strlen(dname); | |
1070 | int nlen = name ? strlen(name) : 0; | |
1071 | ||
1072 | if (nlen < dlen) | |
1073 | continue; | |
1074 | ||
1075 | /* disregard trailing slashes */ | |
1076 | n = name + nlen - 1; | |
1077 | while ((*n == '/') && (n > name)) | |
1078 | n--; | |
1079 | ||
1080 | /* find last path component */ | |
1081 | n = n - dlen + 1; | |
1082 | if (n < name) | |
1083 | continue; | |
1084 | else if (n > name) { | |
1085 | if (*--n != '/') | |
1086 | continue; | |
1087 | else | |
1088 | n++; | |
1089 | } | |
1090 | ||
1091 | if (strncmp(n, dname, dlen) == 0) | |
1092 | goto update_context; | |
1093 | } | |
1094 | ||
1095 | /* catch-all in case match not found */ | |
1096 | idx = context->name_count++; | |
1097 | context->names[idx].name = NULL; | |
1098 | context->names[idx].pino = pino; | |
1099 | #if AUDIT_DEBUG | |
1100 | context->ino_count++; | |
1101 | #endif | |
1102 | ||
1103 | update_context: | |
1104 | if (inode) { | |
1105 | context->names[idx].ino = inode->i_ino; | |
1106 | context->names[idx].dev = inode->i_sb->s_dev; | |
1107 | context->names[idx].mode = inode->i_mode; | |
1108 | context->names[idx].uid = inode->i_uid; | |
1109 | context->names[idx].gid = inode->i_gid; | |
1110 | context->names[idx].rdev = inode->i_rdev; | |
8c8570fb | 1111 | audit_inode_context(idx, inode); |
73241ccc | 1112 | } |
1da177e4 LT |
1113 | } |
1114 | ||
b0dd25a8 RD |
1115 | /** |
1116 | * auditsc_get_stamp - get local copies of audit_context values | |
1117 | * @ctx: audit_context for the task | |
1118 | * @t: timespec to store time recorded in the audit_context | |
1119 | * @serial: serial value that is recorded in the audit_context | |
1120 | * | |
1121 | * Also sets the context as auditable. | |
1122 | */ | |
bfb4496e DW |
1123 | void auditsc_get_stamp(struct audit_context *ctx, |
1124 | struct timespec *t, unsigned int *serial) | |
1da177e4 | 1125 | { |
ce625a80 DW |
1126 | if (!ctx->serial) |
1127 | ctx->serial = audit_serial(); | |
bfb4496e DW |
1128 | t->tv_sec = ctx->ctime.tv_sec; |
1129 | t->tv_nsec = ctx->ctime.tv_nsec; | |
1130 | *serial = ctx->serial; | |
1131 | ctx->auditable = 1; | |
1da177e4 LT |
1132 | } |
1133 | ||
b0dd25a8 RD |
1134 | /** |
1135 | * audit_set_loginuid - set a task's audit_context loginuid | |
1136 | * @task: task whose audit context is being modified | |
1137 | * @loginuid: loginuid value | |
1138 | * | |
1139 | * Returns 0. | |
1140 | * | |
1141 | * Called (set) from fs/proc/base.c::proc_loginuid_write(). | |
1142 | */ | |
456be6cd | 1143 | int audit_set_loginuid(struct task_struct *task, uid_t loginuid) |
1da177e4 | 1144 | { |
456be6cd | 1145 | if (task->audit_context) { |
c0404993 SG |
1146 | struct audit_buffer *ab; |
1147 | ||
9ad9ad38 | 1148 | ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_LOGIN); |
c0404993 SG |
1149 | if (ab) { |
1150 | audit_log_format(ab, "login pid=%d uid=%u " | |
326e9c8b | 1151 | "old auid=%u new auid=%u", |
c0404993 SG |
1152 | task->pid, task->uid, |
1153 | task->audit_context->loginuid, loginuid); | |
1154 | audit_log_end(ab); | |
1155 | } | |
456be6cd | 1156 | task->audit_context->loginuid = loginuid; |
1da177e4 LT |
1157 | } |
1158 | return 0; | |
1159 | } | |
1160 | ||
b0dd25a8 RD |
1161 | /** |
1162 | * audit_get_loginuid - get the loginuid for an audit_context | |
1163 | * @ctx: the audit_context | |
1164 | * | |
1165 | * Returns the context's loginuid or -1 if @ctx is NULL. | |
1166 | */ | |
1da177e4 LT |
1167 | uid_t audit_get_loginuid(struct audit_context *ctx) |
1168 | { | |
1169 | return ctx ? ctx->loginuid : -1; | |
1170 | } | |
1171 | ||
b0dd25a8 | 1172 | /** |
073115d6 SG |
1173 | * audit_ipc_obj - record audit data for ipc object |
1174 | * @ipcp: ipc permissions | |
1175 | * | |
1176 | * Returns 0 for success or NULL context or < 0 on error. | |
1177 | */ | |
1178 | int audit_ipc_obj(struct kern_ipc_perm *ipcp) | |
1179 | { | |
1180 | struct audit_aux_data_ipcctl *ax; | |
1181 | struct audit_context *context = current->audit_context; | |
1182 | ||
1183 | if (likely(!context)) | |
1184 | return 0; | |
1185 | ||
1186 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1187 | if (!ax) | |
1188 | return -ENOMEM; | |
1189 | ||
1190 | ax->uid = ipcp->uid; | |
1191 | ax->gid = ipcp->gid; | |
1192 | ax->mode = ipcp->mode; | |
1193 | selinux_get_ipc_sid(ipcp, &ax->osid); | |
1194 | ||
1195 | ax->d.type = AUDIT_IPC; | |
1196 | ax->d.next = context->aux; | |
1197 | context->aux = (void *)ax; | |
1198 | return 0; | |
1199 | } | |
1200 | ||
1201 | /** | |
1202 | * audit_ipc_set_perm - record audit data for new ipc permissions | |
b0dd25a8 RD |
1203 | * @qbytes: msgq bytes |
1204 | * @uid: msgq user id | |
1205 | * @gid: msgq group id | |
1206 | * @mode: msgq mode (permissions) | |
1207 | * | |
1208 | * Returns 0 for success or NULL context or < 0 on error. | |
1209 | */ | |
073115d6 | 1210 | int audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode, struct kern_ipc_perm *ipcp) |
1da177e4 LT |
1211 | { |
1212 | struct audit_aux_data_ipcctl *ax; | |
1213 | struct audit_context *context = current->audit_context; | |
1214 | ||
1215 | if (likely(!context)) | |
1216 | return 0; | |
1217 | ||
8c8570fb | 1218 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); |
1da177e4 LT |
1219 | if (!ax) |
1220 | return -ENOMEM; | |
1221 | ||
1222 | ax->qbytes = qbytes; | |
1223 | ax->uid = uid; | |
1224 | ax->gid = gid; | |
1225 | ax->mode = mode; | |
9c7aa6aa | 1226 | selinux_get_ipc_sid(ipcp, &ax->osid); |
1da177e4 | 1227 | |
073115d6 | 1228 | ax->d.type = AUDIT_IPC_SET_PERM; |
1da177e4 LT |
1229 | ax->d.next = context->aux; |
1230 | context->aux = (void *)ax; | |
1231 | return 0; | |
1232 | } | |
c2f0c7c3 | 1233 | |
b0dd25a8 RD |
1234 | /** |
1235 | * audit_socketcall - record audit data for sys_socketcall | |
1236 | * @nargs: number of args | |
1237 | * @args: args array | |
1238 | * | |
1239 | * Returns 0 for success or NULL context or < 0 on error. | |
1240 | */ | |
3ec3b2fb DW |
1241 | int audit_socketcall(int nargs, unsigned long *args) |
1242 | { | |
1243 | struct audit_aux_data_socketcall *ax; | |
1244 | struct audit_context *context = current->audit_context; | |
1245 | ||
1246 | if (likely(!context)) | |
1247 | return 0; | |
1248 | ||
1249 | ax = kmalloc(sizeof(*ax) + nargs * sizeof(unsigned long), GFP_KERNEL); | |
1250 | if (!ax) | |
1251 | return -ENOMEM; | |
1252 | ||
1253 | ax->nargs = nargs; | |
1254 | memcpy(ax->args, args, nargs * sizeof(unsigned long)); | |
1255 | ||
1256 | ax->d.type = AUDIT_SOCKETCALL; | |
1257 | ax->d.next = context->aux; | |
1258 | context->aux = (void *)ax; | |
1259 | return 0; | |
1260 | } | |
1261 | ||
b0dd25a8 RD |
1262 | /** |
1263 | * audit_sockaddr - record audit data for sys_bind, sys_connect, sys_sendto | |
1264 | * @len: data length in user space | |
1265 | * @a: data address in kernel space | |
1266 | * | |
1267 | * Returns 0 for success or NULL context or < 0 on error. | |
1268 | */ | |
3ec3b2fb DW |
1269 | int audit_sockaddr(int len, void *a) |
1270 | { | |
1271 | struct audit_aux_data_sockaddr *ax; | |
1272 | struct audit_context *context = current->audit_context; | |
1273 | ||
1274 | if (likely(!context)) | |
1275 | return 0; | |
1276 | ||
1277 | ax = kmalloc(sizeof(*ax) + len, GFP_KERNEL); | |
1278 | if (!ax) | |
1279 | return -ENOMEM; | |
1280 | ||
1281 | ax->len = len; | |
1282 | memcpy(ax->a, a, len); | |
1283 | ||
1284 | ax->d.type = AUDIT_SOCKADDR; | |
1285 | ax->d.next = context->aux; | |
1286 | context->aux = (void *)ax; | |
1287 | return 0; | |
1288 | } | |
1289 | ||
b0dd25a8 RD |
1290 | /** |
1291 | * audit_avc_path - record the granting or denial of permissions | |
1292 | * @dentry: dentry to record | |
1293 | * @mnt: mnt to record | |
1294 | * | |
1295 | * Returns 0 for success or NULL context or < 0 on error. | |
1296 | * | |
1297 | * Called from security/selinux/avc.c::avc_audit() | |
1298 | */ | |
01116105 SS |
1299 | int audit_avc_path(struct dentry *dentry, struct vfsmount *mnt) |
1300 | { | |
1301 | struct audit_aux_data_path *ax; | |
1302 | struct audit_context *context = current->audit_context; | |
1303 | ||
1304 | if (likely(!context)) | |
1305 | return 0; | |
1306 | ||
1307 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1308 | if (!ax) | |
1309 | return -ENOMEM; | |
1310 | ||
1311 | ax->dentry = dget(dentry); | |
1312 | ax->mnt = mntget(mnt); | |
1313 | ||
1314 | ax->d.type = AUDIT_AVC_PATH; | |
1315 | ax->d.next = context->aux; | |
1316 | context->aux = (void *)ax; | |
1317 | return 0; | |
1318 | } | |
1319 | ||
b0dd25a8 RD |
1320 | /** |
1321 | * audit_signal_info - record signal info for shutting down audit subsystem | |
1322 | * @sig: signal value | |
1323 | * @t: task being signaled | |
1324 | * | |
1325 | * If the audit subsystem is being terminated, record the task (pid) | |
1326 | * and uid that is doing that. | |
1327 | */ | |
c2f0c7c3 SG |
1328 | void audit_signal_info(int sig, struct task_struct *t) |
1329 | { | |
1330 | extern pid_t audit_sig_pid; | |
1331 | extern uid_t audit_sig_uid; | |
c2f0c7c3 | 1332 | |
582edda5 | 1333 | if (unlikely(audit_pid && t->tgid == audit_pid)) { |
c2f0c7c3 SG |
1334 | if (sig == SIGTERM || sig == SIGHUP) { |
1335 | struct audit_context *ctx = current->audit_context; | |
1336 | audit_sig_pid = current->pid; | |
1337 | if (ctx) | |
1338 | audit_sig_uid = ctx->loginuid; | |
1339 | else | |
1340 | audit_sig_uid = current->uid; | |
1341 | } | |
1342 | } | |
1343 | } |