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1/* auditsc.c -- System-call auditing support
2 * Handles all system-call specific auditing features.
3 *
4 * Copyright 2003-2004 Red Hat Inc., Durham, North Carolina.
5 * Copyright 2005 Hewlett-Packard Development Company, L.P.
6 * Copyright (C) 2005, 2006 IBM Corporation
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 *
32 * POSIX message queue support added by George Wilson <ltcgcw@us.ibm.com>,
33 * 2006.
34 *
35 * The support of additional filter rules compares (>, <, >=, <=) was
36 * added by Dustin Kirkland <dustin.kirkland@us.ibm.com>, 2005.
37 *
38 * Modified by Amy Griffis <amy.griffis@hp.com> to collect additional
39 * filesystem information.
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.
43 */
44
45#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
46
47#include <linux/init.h>
48#include <asm/types.h>
49#include <linux/atomic.h>
50#include <linux/fs.h>
51#include <linux/namei.h>
52#include <linux/mm.h>
53#include <linux/export.h>
54#include <linux/slab.h>
55#include <linux/mount.h>
56#include <linux/socket.h>
57#include <linux/mqueue.h>
58#include <linux/audit.h>
59#include <linux/personality.h>
60#include <linux/time.h>
61#include <linux/netlink.h>
62#include <linux/compiler.h>
63#include <asm/unistd.h>
64#include <linux/security.h>
65#include <linux/list.h>
66#include <linux/binfmts.h>
67#include <linux/highmem.h>
68#include <linux/syscalls.h>
69#include <asm/syscall.h>
70#include <linux/capability.h>
71#include <linux/fs_struct.h>
72#include <linux/compat.h>
73#include <linux/ctype.h>
74#include <linux/string.h>
75#include <linux/uaccess.h>
76#include <linux/fsnotify_backend.h>
77#include <uapi/linux/limits.h>
78
79#include "audit.h"
80
81/* flags stating the success for a syscall */
82#define AUDITSC_INVALID 0
83#define AUDITSC_SUCCESS 1
84#define AUDITSC_FAILURE 2
85
86/* no execve audit message should be longer than this (userspace limits),
87 * see the note near the top of audit_log_execve_info() about this value */
88#define MAX_EXECVE_AUDIT_LEN 7500
89
90/* max length to print of cmdline/proctitle value during audit */
91#define MAX_PROCTITLE_AUDIT_LEN 128
92
93/* number of audit rules */
94int audit_n_rules;
95
96/* determines whether we collect data for signals sent */
97int audit_signals;
98
99struct audit_aux_data {
100 struct audit_aux_data *next;
101 int type;
102};
103
104#define AUDIT_AUX_IPCPERM 0
105
106/* Number of target pids per aux struct. */
107#define AUDIT_AUX_PIDS 16
108
109struct audit_aux_data_pids {
110 struct audit_aux_data d;
111 pid_t target_pid[AUDIT_AUX_PIDS];
112 kuid_t target_auid[AUDIT_AUX_PIDS];
113 kuid_t target_uid[AUDIT_AUX_PIDS];
114 unsigned int target_sessionid[AUDIT_AUX_PIDS];
115 u32 target_sid[AUDIT_AUX_PIDS];
116 char target_comm[AUDIT_AUX_PIDS][TASK_COMM_LEN];
117 int pid_count;
118};
119
120struct audit_aux_data_bprm_fcaps {
121 struct audit_aux_data d;
122 struct audit_cap_data fcap;
123 unsigned int fcap_ver;
124 struct audit_cap_data old_pcap;
125 struct audit_cap_data new_pcap;
126};
127
128struct audit_tree_refs {
129 struct audit_tree_refs *next;
130 struct audit_chunk *c[31];
131};
132
133static int audit_match_perm(struct audit_context *ctx, int mask)
134{
135 unsigned n;
136 if (unlikely(!ctx))
137 return 0;
138 n = ctx->major;
139
140 switch (audit_classify_syscall(ctx->arch, n)) {
141 case 0: /* native */
142 if ((mask & AUDIT_PERM_WRITE) &&
143 audit_match_class(AUDIT_CLASS_WRITE, n))
144 return 1;
145 if ((mask & AUDIT_PERM_READ) &&
146 audit_match_class(AUDIT_CLASS_READ, n))
147 return 1;
148 if ((mask & AUDIT_PERM_ATTR) &&
149 audit_match_class(AUDIT_CLASS_CHATTR, n))
150 return 1;
151 return 0;
152 case 1: /* 32bit on biarch */
153 if ((mask & AUDIT_PERM_WRITE) &&
154 audit_match_class(AUDIT_CLASS_WRITE_32, n))
155 return 1;
156 if ((mask & AUDIT_PERM_READ) &&
157 audit_match_class(AUDIT_CLASS_READ_32, n))
158 return 1;
159 if ((mask & AUDIT_PERM_ATTR) &&
160 audit_match_class(AUDIT_CLASS_CHATTR_32, n))
161 return 1;
162 return 0;
163 case 2: /* open */
164 return mask & ACC_MODE(ctx->argv[1]);
165 case 3: /* openat */
166 return mask & ACC_MODE(ctx->argv[2]);
167 case 4: /* socketcall */
168 return ((mask & AUDIT_PERM_WRITE) && ctx->argv[0] == SYS_BIND);
169 case 5: /* execve */
170 return mask & AUDIT_PERM_EXEC;
171 default:
172 return 0;
173 }
174}
175
176static int audit_match_filetype(struct audit_context *ctx, int val)
177{
178 struct audit_names *n;
179 umode_t mode = (umode_t)val;
180
181 if (unlikely(!ctx))
182 return 0;
183
184 list_for_each_entry(n, &ctx->names_list, list) {
185 if ((n->ino != AUDIT_INO_UNSET) &&
186 ((n->mode & S_IFMT) == mode))
187 return 1;
188 }
189
190 return 0;
191}
192
193/*
194 * We keep a linked list of fixed-sized (31 pointer) arrays of audit_chunk *;
195 * ->first_trees points to its beginning, ->trees - to the current end of data.
196 * ->tree_count is the number of free entries in array pointed to by ->trees.
197 * Original condition is (NULL, NULL, 0); as soon as it grows we never revert to NULL,
198 * "empty" becomes (p, p, 31) afterwards. We don't shrink the list (and seriously,
199 * it's going to remain 1-element for almost any setup) until we free context itself.
200 * References in it _are_ dropped - at the same time we free/drop aux stuff.
201 */
202
203static void audit_set_auditable(struct audit_context *ctx)
204{
205 if (!ctx->prio) {
206 ctx->prio = 1;
207 ctx->current_state = AUDIT_RECORD_CONTEXT;
208 }
209}
210
211static int put_tree_ref(struct audit_context *ctx, struct audit_chunk *chunk)
212{
213 struct audit_tree_refs *p = ctx->trees;
214 int left = ctx->tree_count;
215 if (likely(left)) {
216 p->c[--left] = chunk;
217 ctx->tree_count = left;
218 return 1;
219 }
220 if (!p)
221 return 0;
222 p = p->next;
223 if (p) {
224 p->c[30] = chunk;
225 ctx->trees = p;
226 ctx->tree_count = 30;
227 return 1;
228 }
229 return 0;
230}
231
232static int grow_tree_refs(struct audit_context *ctx)
233{
234 struct audit_tree_refs *p = ctx->trees;
235 ctx->trees = kzalloc(sizeof(struct audit_tree_refs), GFP_KERNEL);
236 if (!ctx->trees) {
237 ctx->trees = p;
238 return 0;
239 }
240 if (p)
241 p->next = ctx->trees;
242 else
243 ctx->first_trees = ctx->trees;
244 ctx->tree_count = 31;
245 return 1;
246}
247
248static void unroll_tree_refs(struct audit_context *ctx,
249 struct audit_tree_refs *p, int count)
250{
251 struct audit_tree_refs *q;
252 int n;
253 if (!p) {
254 /* we started with empty chain */
255 p = ctx->first_trees;
256 count = 31;
257 /* if the very first allocation has failed, nothing to do */
258 if (!p)
259 return;
260 }
261 n = count;
262 for (q = p; q != ctx->trees; q = q->next, n = 31) {
263 while (n--) {
264 audit_put_chunk(q->c[n]);
265 q->c[n] = NULL;
266 }
267 }
268 while (n-- > ctx->tree_count) {
269 audit_put_chunk(q->c[n]);
270 q->c[n] = NULL;
271 }
272 ctx->trees = p;
273 ctx->tree_count = count;
274}
275
276static void free_tree_refs(struct audit_context *ctx)
277{
278 struct audit_tree_refs *p, *q;
279 for (p = ctx->first_trees; p; p = q) {
280 q = p->next;
281 kfree(p);
282 }
283}
284
285static int match_tree_refs(struct audit_context *ctx, struct audit_tree *tree)
286{
287 struct audit_tree_refs *p;
288 int n;
289 if (!tree)
290 return 0;
291 /* full ones */
292 for (p = ctx->first_trees; p != ctx->trees; p = p->next) {
293 for (n = 0; n < 31; n++)
294 if (audit_tree_match(p->c[n], tree))
295 return 1;
296 }
297 /* partial */
298 if (p) {
299 for (n = ctx->tree_count; n < 31; n++)
300 if (audit_tree_match(p->c[n], tree))
301 return 1;
302 }
303 return 0;
304}
305
306static int audit_compare_uid(kuid_t uid,
307 struct audit_names *name,
308 struct audit_field *f,
309 struct audit_context *ctx)
310{
311 struct audit_names *n;
312 int rc;
313
314 if (name) {
315 rc = audit_uid_comparator(uid, f->op, name->uid);
316 if (rc)
317 return rc;
318 }
319
320 if (ctx) {
321 list_for_each_entry(n, &ctx->names_list, list) {
322 rc = audit_uid_comparator(uid, f->op, n->uid);
323 if (rc)
324 return rc;
325 }
326 }
327 return 0;
328}
329
330static int audit_compare_gid(kgid_t gid,
331 struct audit_names *name,
332 struct audit_field *f,
333 struct audit_context *ctx)
334{
335 struct audit_names *n;
336 int rc;
337
338 if (name) {
339 rc = audit_gid_comparator(gid, f->op, name->gid);
340 if (rc)
341 return rc;
342 }
343
344 if (ctx) {
345 list_for_each_entry(n, &ctx->names_list, list) {
346 rc = audit_gid_comparator(gid, f->op, n->gid);
347 if (rc)
348 return rc;
349 }
350 }
351 return 0;
352}
353
354static int audit_field_compare(struct task_struct *tsk,
355 const struct cred *cred,
356 struct audit_field *f,
357 struct audit_context *ctx,
358 struct audit_names *name)
359{
360 switch (f->val) {
361 /* process to file object comparisons */
362 case AUDIT_COMPARE_UID_TO_OBJ_UID:
363 return audit_compare_uid(cred->uid, name, f, ctx);
364 case AUDIT_COMPARE_GID_TO_OBJ_GID:
365 return audit_compare_gid(cred->gid, name, f, ctx);
366 case AUDIT_COMPARE_EUID_TO_OBJ_UID:
367 return audit_compare_uid(cred->euid, name, f, ctx);
368 case AUDIT_COMPARE_EGID_TO_OBJ_GID:
369 return audit_compare_gid(cred->egid, name, f, ctx);
370 case AUDIT_COMPARE_AUID_TO_OBJ_UID:
371 return audit_compare_uid(audit_get_loginuid(tsk), name, f, ctx);
372 case AUDIT_COMPARE_SUID_TO_OBJ_UID:
373 return audit_compare_uid(cred->suid, name, f, ctx);
374 case AUDIT_COMPARE_SGID_TO_OBJ_GID:
375 return audit_compare_gid(cred->sgid, name, f, ctx);
376 case AUDIT_COMPARE_FSUID_TO_OBJ_UID:
377 return audit_compare_uid(cred->fsuid, name, f, ctx);
378 case AUDIT_COMPARE_FSGID_TO_OBJ_GID:
379 return audit_compare_gid(cred->fsgid, name, f, ctx);
380 /* uid comparisons */
381 case AUDIT_COMPARE_UID_TO_AUID:
382 return audit_uid_comparator(cred->uid, f->op,
383 audit_get_loginuid(tsk));
384 case AUDIT_COMPARE_UID_TO_EUID:
385 return audit_uid_comparator(cred->uid, f->op, cred->euid);
386 case AUDIT_COMPARE_UID_TO_SUID:
387 return audit_uid_comparator(cred->uid, f->op, cred->suid);
388 case AUDIT_COMPARE_UID_TO_FSUID:
389 return audit_uid_comparator(cred->uid, f->op, cred->fsuid);
390 /* auid comparisons */
391 case AUDIT_COMPARE_AUID_TO_EUID:
392 return audit_uid_comparator(audit_get_loginuid(tsk), f->op,
393 cred->euid);
394 case AUDIT_COMPARE_AUID_TO_SUID:
395 return audit_uid_comparator(audit_get_loginuid(tsk), f->op,
396 cred->suid);
397 case AUDIT_COMPARE_AUID_TO_FSUID:
398 return audit_uid_comparator(audit_get_loginuid(tsk), f->op,
399 cred->fsuid);
400 /* euid comparisons */
401 case AUDIT_COMPARE_EUID_TO_SUID:
402 return audit_uid_comparator(cred->euid, f->op, cred->suid);
403 case AUDIT_COMPARE_EUID_TO_FSUID:
404 return audit_uid_comparator(cred->euid, f->op, cred->fsuid);
405 /* suid comparisons */
406 case AUDIT_COMPARE_SUID_TO_FSUID:
407 return audit_uid_comparator(cred->suid, f->op, cred->fsuid);
408 /* gid comparisons */
409 case AUDIT_COMPARE_GID_TO_EGID:
410 return audit_gid_comparator(cred->gid, f->op, cred->egid);
411 case AUDIT_COMPARE_GID_TO_SGID:
412 return audit_gid_comparator(cred->gid, f->op, cred->sgid);
413 case AUDIT_COMPARE_GID_TO_FSGID:
414 return audit_gid_comparator(cred->gid, f->op, cred->fsgid);
415 /* egid comparisons */
416 case AUDIT_COMPARE_EGID_TO_SGID:
417 return audit_gid_comparator(cred->egid, f->op, cred->sgid);
418 case AUDIT_COMPARE_EGID_TO_FSGID:
419 return audit_gid_comparator(cred->egid, f->op, cred->fsgid);
420 /* sgid comparison */
421 case AUDIT_COMPARE_SGID_TO_FSGID:
422 return audit_gid_comparator(cred->sgid, f->op, cred->fsgid);
423 default:
424 WARN(1, "Missing AUDIT_COMPARE define. Report as a bug\n");
425 return 0;
426 }
427 return 0;
428}
429
430/* Determine if any context name data matches a rule's watch data */
431/* Compare a task_struct with an audit_rule. Return 1 on match, 0
432 * otherwise.
433 *
434 * If task_creation is true, this is an explicit indication that we are
435 * filtering a task rule at task creation time. This and tsk == current are
436 * the only situations where tsk->cred may be accessed without an rcu read lock.
437 */
438static int audit_filter_rules(struct task_struct *tsk,
439 struct audit_krule *rule,
440 struct audit_context *ctx,
441 struct audit_names *name,
442 enum audit_state *state,
443 bool task_creation)
444{
445 const struct cred *cred;
446 int i, need_sid = 1;
447 u32 sid;
448 unsigned int sessionid;
449
450 cred = rcu_dereference_check(tsk->cred, tsk == current || task_creation);
451
452 for (i = 0; i < rule->field_count; i++) {
453 struct audit_field *f = &rule->fields[i];
454 struct audit_names *n;
455 int result = 0;
456 pid_t pid;
457
458 switch (f->type) {
459 case AUDIT_PID:
460 pid = task_tgid_nr(tsk);
461 result = audit_comparator(pid, f->op, f->val);
462 break;
463 case AUDIT_PPID:
464 if (ctx) {
465 if (!ctx->ppid)
466 ctx->ppid = task_ppid_nr(tsk);
467 result = audit_comparator(ctx->ppid, f->op, f->val);
468 }
469 break;
470 case AUDIT_EXE:
471 result = audit_exe_compare(tsk, rule->exe);
472 if (f->op == Audit_not_equal)
473 result = !result;
474 break;
475 case AUDIT_UID:
476 result = audit_uid_comparator(cred->uid, f->op, f->uid);
477 break;
478 case AUDIT_EUID:
479 result = audit_uid_comparator(cred->euid, f->op, f->uid);
480 break;
481 case AUDIT_SUID:
482 result = audit_uid_comparator(cred->suid, f->op, f->uid);
483 break;
484 case AUDIT_FSUID:
485 result = audit_uid_comparator(cred->fsuid, f->op, f->uid);
486 break;
487 case AUDIT_GID:
488 result = audit_gid_comparator(cred->gid, f->op, f->gid);
489 if (f->op == Audit_equal) {
490 if (!result)
491 result = groups_search(cred->group_info, f->gid);
492 } else if (f->op == Audit_not_equal) {
493 if (result)
494 result = !groups_search(cred->group_info, f->gid);
495 }
496 break;
497 case AUDIT_EGID:
498 result = audit_gid_comparator(cred->egid, f->op, f->gid);
499 if (f->op == Audit_equal) {
500 if (!result)
501 result = groups_search(cred->group_info, f->gid);
502 } else if (f->op == Audit_not_equal) {
503 if (result)
504 result = !groups_search(cred->group_info, f->gid);
505 }
506 break;
507 case AUDIT_SGID:
508 result = audit_gid_comparator(cred->sgid, f->op, f->gid);
509 break;
510 case AUDIT_FSGID:
511 result = audit_gid_comparator(cred->fsgid, f->op, f->gid);
512 break;
513 case AUDIT_SESSIONID:
514 sessionid = audit_get_sessionid(tsk);
515 result = audit_comparator(sessionid, f->op, f->val);
516 break;
517 case AUDIT_PERS:
518 result = audit_comparator(tsk->personality, f->op, f->val);
519 break;
520 case AUDIT_ARCH:
521 if (ctx)
522 result = audit_comparator(ctx->arch, f->op, f->val);
523 break;
524
525 case AUDIT_EXIT:
526 if (ctx && ctx->return_valid)
527 result = audit_comparator(ctx->return_code, f->op, f->val);
528 break;
529 case AUDIT_SUCCESS:
530 if (ctx && ctx->return_valid) {
531 if (f->val)
532 result = audit_comparator(ctx->return_valid, f->op, AUDITSC_SUCCESS);
533 else
534 result = audit_comparator(ctx->return_valid, f->op, AUDITSC_FAILURE);
535 }
536 break;
537 case AUDIT_DEVMAJOR:
538 if (name) {
539 if (audit_comparator(MAJOR(name->dev), f->op, f->val) ||
540 audit_comparator(MAJOR(name->rdev), f->op, f->val))
541 ++result;
542 } else if (ctx) {
543 list_for_each_entry(n, &ctx->names_list, list) {
544 if (audit_comparator(MAJOR(n->dev), f->op, f->val) ||
545 audit_comparator(MAJOR(n->rdev), f->op, f->val)) {
546 ++result;
547 break;
548 }
549 }
550 }
551 break;
552 case AUDIT_DEVMINOR:
553 if (name) {
554 if (audit_comparator(MINOR(name->dev), f->op, f->val) ||
555 audit_comparator(MINOR(name->rdev), f->op, f->val))
556 ++result;
557 } else if (ctx) {
558 list_for_each_entry(n, &ctx->names_list, list) {
559 if (audit_comparator(MINOR(n->dev), f->op, f->val) ||
560 audit_comparator(MINOR(n->rdev), f->op, f->val)) {
561 ++result;
562 break;
563 }
564 }
565 }
566 break;
567 case AUDIT_INODE:
568 if (name)
569 result = audit_comparator(name->ino, f->op, f->val);
570 else if (ctx) {
571 list_for_each_entry(n, &ctx->names_list, list) {
572 if (audit_comparator(n->ino, f->op, f->val)) {
573 ++result;
574 break;
575 }
576 }
577 }
578 break;
579 case AUDIT_OBJ_UID:
580 if (name) {
581 result = audit_uid_comparator(name->uid, f->op, f->uid);
582 } else if (ctx) {
583 list_for_each_entry(n, &ctx->names_list, list) {
584 if (audit_uid_comparator(n->uid, f->op, f->uid)) {
585 ++result;
586 break;
587 }
588 }
589 }
590 break;
591 case AUDIT_OBJ_GID:
592 if (name) {
593 result = audit_gid_comparator(name->gid, f->op, f->gid);
594 } else if (ctx) {
595 list_for_each_entry(n, &ctx->names_list, list) {
596 if (audit_gid_comparator(n->gid, f->op, f->gid)) {
597 ++result;
598 break;
599 }
600 }
601 }
602 break;
603 case AUDIT_WATCH:
604 if (name) {
605 result = audit_watch_compare(rule->watch,
606 name->ino,
607 name->dev);
608 if (f->op == Audit_not_equal)
609 result = !result;
610 }
611 break;
612 case AUDIT_DIR:
613 if (ctx) {
614 result = match_tree_refs(ctx, rule->tree);
615 if (f->op == Audit_not_equal)
616 result = !result;
617 }
618 break;
619 case AUDIT_LOGINUID:
620 result = audit_uid_comparator(audit_get_loginuid(tsk),
621 f->op, f->uid);
622 break;
623 case AUDIT_LOGINUID_SET:
624 result = audit_comparator(audit_loginuid_set(tsk), f->op, f->val);
625 break;
626 case AUDIT_SADDR_FAM:
627 if (ctx->sockaddr)
628 result = audit_comparator(ctx->sockaddr->ss_family,
629 f->op, f->val);
630 break;
631 case AUDIT_SUBJ_USER:
632 case AUDIT_SUBJ_ROLE:
633 case AUDIT_SUBJ_TYPE:
634 case AUDIT_SUBJ_SEN:
635 case AUDIT_SUBJ_CLR:
636 /* NOTE: this may return negative values indicating
637 a temporary error. We simply treat this as a
638 match for now to avoid losing information that
639 may be wanted. An error message will also be
640 logged upon error */
641 if (f->lsm_rule) {
642 if (need_sid) {
643 security_task_getsecid(tsk, &sid);
644 need_sid = 0;
645 }
646 result = security_audit_rule_match(sid, f->type,
647 f->op,
648 f->lsm_rule);
649 }
650 break;
651 case AUDIT_OBJ_USER:
652 case AUDIT_OBJ_ROLE:
653 case AUDIT_OBJ_TYPE:
654 case AUDIT_OBJ_LEV_LOW:
655 case AUDIT_OBJ_LEV_HIGH:
656 /* The above note for AUDIT_SUBJ_USER...AUDIT_SUBJ_CLR
657 also applies here */
658 if (f->lsm_rule) {
659 /* Find files that match */
660 if (name) {
661 result = security_audit_rule_match(
662 name->osid,
663 f->type,
664 f->op,
665 f->lsm_rule);
666 } else if (ctx) {
667 list_for_each_entry(n, &ctx->names_list, list) {
668 if (security_audit_rule_match(
669 n->osid,
670 f->type,
671 f->op,
672 f->lsm_rule)) {
673 ++result;
674 break;
675 }
676 }
677 }
678 /* Find ipc objects that match */
679 if (!ctx || ctx->type != AUDIT_IPC)
680 break;
681 if (security_audit_rule_match(ctx->ipc.osid,
682 f->type, f->op,
683 f->lsm_rule))
684 ++result;
685 }
686 break;
687 case AUDIT_ARG0:
688 case AUDIT_ARG1:
689 case AUDIT_ARG2:
690 case AUDIT_ARG3:
691 if (ctx)
692 result = audit_comparator(ctx->argv[f->type-AUDIT_ARG0], f->op, f->val);
693 break;
694 case AUDIT_FILTERKEY:
695 /* ignore this field for filtering */
696 result = 1;
697 break;
698 case AUDIT_PERM:
699 result = audit_match_perm(ctx, f->val);
700 if (f->op == Audit_not_equal)
701 result = !result;
702 break;
703 case AUDIT_FILETYPE:
704 result = audit_match_filetype(ctx, f->val);
705 if (f->op == Audit_not_equal)
706 result = !result;
707 break;
708 case AUDIT_FIELD_COMPARE:
709 result = audit_field_compare(tsk, cred, f, ctx, name);
710 break;
711 }
712 if (!result)
713 return 0;
714 }
715
716 if (ctx) {
717 if (rule->prio <= ctx->prio)
718 return 0;
719 if (rule->filterkey) {
720 kfree(ctx->filterkey);
721 ctx->filterkey = kstrdup(rule->filterkey, GFP_ATOMIC);
722 }
723 ctx->prio = rule->prio;
724 }
725 switch (rule->action) {
726 case AUDIT_NEVER:
727 *state = AUDIT_DISABLED;
728 break;
729 case AUDIT_ALWAYS:
730 *state = AUDIT_RECORD_CONTEXT;
731 break;
732 }
733 return 1;
734}
735
736/* At process creation time, we can determine if system-call auditing is
737 * completely disabled for this task. Since we only have the task
738 * structure at this point, we can only check uid and gid.
739 */
740static enum audit_state audit_filter_task(struct task_struct *tsk, char **key)
741{
742 struct audit_entry *e;
743 enum audit_state state;
744
745 rcu_read_lock();
746 list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_TASK], list) {
747 if (audit_filter_rules(tsk, &e->rule, NULL, NULL,
748 &state, true)) {
749 if (state == AUDIT_RECORD_CONTEXT)
750 *key = kstrdup(e->rule.filterkey, GFP_ATOMIC);
751 rcu_read_unlock();
752 return state;
753 }
754 }
755 rcu_read_unlock();
756 return AUDIT_BUILD_CONTEXT;
757}
758
759static int audit_in_mask(const struct audit_krule *rule, unsigned long val)
760{
761 int word, bit;
762
763 if (val > 0xffffffff)
764 return false;
765
766 word = AUDIT_WORD(val);
767 if (word >= AUDIT_BITMASK_SIZE)
768 return false;
769
770 bit = AUDIT_BIT(val);
771
772 return rule->mask[word] & bit;
773}
774
775/* At syscall entry and exit time, this filter is called if the
776 * audit_state is not low enough that auditing cannot take place, but is
777 * also not high enough that we already know we have to write an audit
778 * record (i.e., the state is AUDIT_SETUP_CONTEXT or AUDIT_BUILD_CONTEXT).
779 */
780static enum audit_state audit_filter_syscall(struct task_struct *tsk,
781 struct audit_context *ctx,
782 struct list_head *list)
783{
784 struct audit_entry *e;
785 enum audit_state state;
786
787 if (auditd_test_task(tsk))
788 return AUDIT_DISABLED;
789
790 rcu_read_lock();
791 list_for_each_entry_rcu(e, list, list) {
792 if (audit_in_mask(&e->rule, ctx->major) &&
793 audit_filter_rules(tsk, &e->rule, ctx, NULL,
794 &state, false)) {
795 rcu_read_unlock();
796 ctx->current_state = state;
797 return state;
798 }
799 }
800 rcu_read_unlock();
801 return AUDIT_BUILD_CONTEXT;
802}
803
804/*
805 * Given an audit_name check the inode hash table to see if they match.
806 * Called holding the rcu read lock to protect the use of audit_inode_hash
807 */
808static int audit_filter_inode_name(struct task_struct *tsk,
809 struct audit_names *n,
810 struct audit_context *ctx) {
811 int h = audit_hash_ino((u32)n->ino);
812 struct list_head *list = &audit_inode_hash[h];
813 struct audit_entry *e;
814 enum audit_state state;
815
816 list_for_each_entry_rcu(e, list, list) {
817 if (audit_in_mask(&e->rule, ctx->major) &&
818 audit_filter_rules(tsk, &e->rule, ctx, n, &state, false)) {
819 ctx->current_state = state;
820 return 1;
821 }
822 }
823 return 0;
824}
825
826/* At syscall exit time, this filter is called if any audit_names have been
827 * collected during syscall processing. We only check rules in sublists at hash
828 * buckets applicable to the inode numbers in audit_names.
829 * Regarding audit_state, same rules apply as for audit_filter_syscall().
830 */
831void audit_filter_inodes(struct task_struct *tsk, struct audit_context *ctx)
832{
833 struct audit_names *n;
834
835 if (auditd_test_task(tsk))
836 return;
837
838 rcu_read_lock();
839
840 list_for_each_entry(n, &ctx->names_list, list) {
841 if (audit_filter_inode_name(tsk, n, ctx))
842 break;
843 }
844 rcu_read_unlock();
845}
846
847static inline void audit_proctitle_free(struct audit_context *context)
848{
849 kfree(context->proctitle.value);
850 context->proctitle.value = NULL;
851 context->proctitle.len = 0;
852}
853
854static inline void audit_free_module(struct audit_context *context)
855{
856 if (context->type == AUDIT_KERN_MODULE) {
857 kfree(context->module.name);
858 context->module.name = NULL;
859 }
860}
861static inline void audit_free_names(struct audit_context *context)
862{
863 struct audit_names *n, *next;
864
865 list_for_each_entry_safe(n, next, &context->names_list, list) {
866 list_del(&n->list);
867 if (n->name)
868 putname(n->name);
869 if (n->should_free)
870 kfree(n);
871 }
872 context->name_count = 0;
873 path_put(&context->pwd);
874 context->pwd.dentry = NULL;
875 context->pwd.mnt = NULL;
876}
877
878static inline void audit_free_aux(struct audit_context *context)
879{
880 struct audit_aux_data *aux;
881
882 while ((aux = context->aux)) {
883 context->aux = aux->next;
884 kfree(aux);
885 }
886 while ((aux = context->aux_pids)) {
887 context->aux_pids = aux->next;
888 kfree(aux);
889 }
890}
891
892static inline struct audit_context *audit_alloc_context(enum audit_state state)
893{
894 struct audit_context *context;
895
896 context = kzalloc(sizeof(*context), GFP_KERNEL);
897 if (!context)
898 return NULL;
899 context->state = state;
900 context->prio = state == AUDIT_RECORD_CONTEXT ? ~0ULL : 0;
901 INIT_LIST_HEAD(&context->killed_trees);
902 INIT_LIST_HEAD(&context->names_list);
903 return context;
904}
905
906/**
907 * audit_alloc - allocate an audit context block for a task
908 * @tsk: task
909 *
910 * Filter on the task information and allocate a per-task audit context
911 * if necessary. Doing so turns on system call auditing for the
912 * specified task. This is called from copy_process, so no lock is
913 * needed.
914 */
915int audit_alloc(struct task_struct *tsk)
916{
917 struct audit_context *context;
918 enum audit_state state;
919 char *key = NULL;
920
921 if (likely(!audit_ever_enabled))
922 return 0; /* Return if not auditing. */
923
924 state = audit_filter_task(tsk, &key);
925 if (state == AUDIT_DISABLED) {
926 clear_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT);
927 return 0;
928 }
929
930 if (!(context = audit_alloc_context(state))) {
931 kfree(key);
932 audit_log_lost("out of memory in audit_alloc");
933 return -ENOMEM;
934 }
935 context->filterkey = key;
936
937 audit_set_context(tsk, context);
938 set_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT);
939 return 0;
940}
941
942static inline void audit_free_context(struct audit_context *context)
943{
944 audit_free_module(context);
945 audit_free_names(context);
946 unroll_tree_refs(context, NULL, 0);
947 free_tree_refs(context);
948 audit_free_aux(context);
949 kfree(context->filterkey);
950 kfree(context->sockaddr);
951 audit_proctitle_free(context);
952 kfree(context);
953}
954
955static int audit_log_pid_context(struct audit_context *context, pid_t pid,
956 kuid_t auid, kuid_t uid, unsigned int sessionid,
957 u32 sid, char *comm)
958{
959 struct audit_buffer *ab;
960 char *ctx = NULL;
961 u32 len;
962 int rc = 0;
963
964 ab = audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID);
965 if (!ab)
966 return rc;
967
968 audit_log_format(ab, "opid=%d oauid=%d ouid=%d oses=%d", pid,
969 from_kuid(&init_user_ns, auid),
970 from_kuid(&init_user_ns, uid), sessionid);
971 if (sid) {
972 if (security_secid_to_secctx(sid, &ctx, &len)) {
973 audit_log_format(ab, " obj=(none)");
974 rc = 1;
975 } else {
976 audit_log_format(ab, " obj=%s", ctx);
977 security_release_secctx(ctx, len);
978 }
979 }
980 audit_log_format(ab, " ocomm=");
981 audit_log_untrustedstring(ab, comm);
982 audit_log_end(ab);
983
984 return rc;
985}
986
987static void audit_log_execve_info(struct audit_context *context,
988 struct audit_buffer **ab)
989{
990 long len_max;
991 long len_rem;
992 long len_full;
993 long len_buf;
994 long len_abuf = 0;
995 long len_tmp;
996 bool require_data;
997 bool encode;
998 unsigned int iter;
999 unsigned int arg;
1000 char *buf_head;
1001 char *buf;
1002 const char __user *p = (const char __user *)current->mm->arg_start;
1003
1004 /* NOTE: this buffer needs to be large enough to hold all the non-arg
1005 * data we put in the audit record for this argument (see the
1006 * code below) ... at this point in time 96 is plenty */
1007 char abuf[96];
1008
1009 /* NOTE: we set MAX_EXECVE_AUDIT_LEN to a rather arbitrary limit, the
1010 * current value of 7500 is not as important as the fact that it
1011 * is less than 8k, a setting of 7500 gives us plenty of wiggle
1012 * room if we go over a little bit in the logging below */
1013 WARN_ON_ONCE(MAX_EXECVE_AUDIT_LEN > 7500);
1014 len_max = MAX_EXECVE_AUDIT_LEN;
1015
1016 /* scratch buffer to hold the userspace args */
1017 buf_head = kmalloc(MAX_EXECVE_AUDIT_LEN + 1, GFP_KERNEL);
1018 if (!buf_head) {
1019 audit_panic("out of memory for argv string");
1020 return;
1021 }
1022 buf = buf_head;
1023
1024 audit_log_format(*ab, "argc=%d", context->execve.argc);
1025
1026 len_rem = len_max;
1027 len_buf = 0;
1028 len_full = 0;
1029 require_data = true;
1030 encode = false;
1031 iter = 0;
1032 arg = 0;
1033 do {
1034 /* NOTE: we don't ever want to trust this value for anything
1035 * serious, but the audit record format insists we
1036 * provide an argument length for really long arguments,
1037 * e.g. > MAX_EXECVE_AUDIT_LEN, so we have no choice but
1038 * to use strncpy_from_user() to obtain this value for
1039 * recording in the log, although we don't use it
1040 * anywhere here to avoid a double-fetch problem */
1041 if (len_full == 0)
1042 len_full = strnlen_user(p, MAX_ARG_STRLEN) - 1;
1043
1044 /* read more data from userspace */
1045 if (require_data) {
1046 /* can we make more room in the buffer? */
1047 if (buf != buf_head) {
1048 memmove(buf_head, buf, len_buf);
1049 buf = buf_head;
1050 }
1051
1052 /* fetch as much as we can of the argument */
1053 len_tmp = strncpy_from_user(&buf_head[len_buf], p,
1054 len_max - len_buf);
1055 if (len_tmp == -EFAULT) {
1056 /* unable to copy from userspace */
1057 send_sig(SIGKILL, current, 0);
1058 goto out;
1059 } else if (len_tmp == (len_max - len_buf)) {
1060 /* buffer is not large enough */
1061 require_data = true;
1062 /* NOTE: if we are going to span multiple
1063 * buffers force the encoding so we stand
1064 * a chance at a sane len_full value and
1065 * consistent record encoding */
1066 encode = true;
1067 len_full = len_full * 2;
1068 p += len_tmp;
1069 } else {
1070 require_data = false;
1071 if (!encode)
1072 encode = audit_string_contains_control(
1073 buf, len_tmp);
1074 /* try to use a trusted value for len_full */
1075 if (len_full < len_max)
1076 len_full = (encode ?
1077 len_tmp * 2 : len_tmp);
1078 p += len_tmp + 1;
1079 }
1080 len_buf += len_tmp;
1081 buf_head[len_buf] = '\0';
1082
1083 /* length of the buffer in the audit record? */
1084 len_abuf = (encode ? len_buf * 2 : len_buf + 2);
1085 }
1086
1087 /* write as much as we can to the audit log */
1088 if (len_buf >= 0) {
1089 /* NOTE: some magic numbers here - basically if we
1090 * can't fit a reasonable amount of data into the
1091 * existing audit buffer, flush it and start with
1092 * a new buffer */
1093 if ((sizeof(abuf) + 8) > len_rem) {
1094 len_rem = len_max;
1095 audit_log_end(*ab);
1096 *ab = audit_log_start(context,
1097 GFP_KERNEL, AUDIT_EXECVE);
1098 if (!*ab)
1099 goto out;
1100 }
1101
1102 /* create the non-arg portion of the arg record */
1103 len_tmp = 0;
1104 if (require_data || (iter > 0) ||
1105 ((len_abuf + sizeof(abuf)) > len_rem)) {
1106 if (iter == 0) {
1107 len_tmp += snprintf(&abuf[len_tmp],
1108 sizeof(abuf) - len_tmp,
1109 " a%d_len=%lu",
1110 arg, len_full);
1111 }
1112 len_tmp += snprintf(&abuf[len_tmp],
1113 sizeof(abuf) - len_tmp,
1114 " a%d[%d]=", arg, iter++);
1115 } else
1116 len_tmp += snprintf(&abuf[len_tmp],
1117 sizeof(abuf) - len_tmp,
1118 " a%d=", arg);
1119 WARN_ON(len_tmp >= sizeof(abuf));
1120 abuf[sizeof(abuf) - 1] = '\0';
1121
1122 /* log the arg in the audit record */
1123 audit_log_format(*ab, "%s", abuf);
1124 len_rem -= len_tmp;
1125 len_tmp = len_buf;
1126 if (encode) {
1127 if (len_abuf > len_rem)
1128 len_tmp = len_rem / 2; /* encoding */
1129 audit_log_n_hex(*ab, buf, len_tmp);
1130 len_rem -= len_tmp * 2;
1131 len_abuf -= len_tmp * 2;
1132 } else {
1133 if (len_abuf > len_rem)
1134 len_tmp = len_rem - 2; /* quotes */
1135 audit_log_n_string(*ab, buf, len_tmp);
1136 len_rem -= len_tmp + 2;
1137 /* don't subtract the "2" because we still need
1138 * to add quotes to the remaining string */
1139 len_abuf -= len_tmp;
1140 }
1141 len_buf -= len_tmp;
1142 buf += len_tmp;
1143 }
1144
1145 /* ready to move to the next argument? */
1146 if ((len_buf == 0) && !require_data) {
1147 arg++;
1148 iter = 0;
1149 len_full = 0;
1150 require_data = true;
1151 encode = false;
1152 }
1153 } while (arg < context->execve.argc);
1154
1155 /* NOTE: the caller handles the final audit_log_end() call */
1156
1157out:
1158 kfree(buf_head);
1159}
1160
1161static void audit_log_cap(struct audit_buffer *ab, char *prefix,
1162 kernel_cap_t *cap)
1163{
1164 int i;
1165
1166 if (cap_isclear(*cap)) {
1167 audit_log_format(ab, " %s=0", prefix);
1168 return;
1169 }
1170 audit_log_format(ab, " %s=", prefix);
1171 CAP_FOR_EACH_U32(i)
1172 audit_log_format(ab, "%08x", cap->cap[CAP_LAST_U32 - i]);
1173}
1174
1175static void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name)
1176{
1177 if (name->fcap_ver == -1) {
1178 audit_log_format(ab, " cap_fe=? cap_fver=? cap_fp=? cap_fi=?");
1179 return;
1180 }
1181 audit_log_cap(ab, "cap_fp", &name->fcap.permitted);
1182 audit_log_cap(ab, "cap_fi", &name->fcap.inheritable);
1183 audit_log_format(ab, " cap_fe=%d cap_fver=%x cap_frootid=%d",
1184 name->fcap.fE, name->fcap_ver,
1185 from_kuid(&init_user_ns, name->fcap.rootid));
1186}
1187
1188static void show_special(struct audit_context *context, int *call_panic)
1189{
1190 struct audit_buffer *ab;
1191 int i;
1192
1193 ab = audit_log_start(context, GFP_KERNEL, context->type);
1194 if (!ab)
1195 return;
1196
1197 switch (context->type) {
1198 case AUDIT_SOCKETCALL: {
1199 int nargs = context->socketcall.nargs;
1200 audit_log_format(ab, "nargs=%d", nargs);
1201 for (i = 0; i < nargs; i++)
1202 audit_log_format(ab, " a%d=%lx", i,
1203 context->socketcall.args[i]);
1204 break; }
1205 case AUDIT_IPC: {
1206 u32 osid = context->ipc.osid;
1207
1208 audit_log_format(ab, "ouid=%u ogid=%u mode=%#ho",
1209 from_kuid(&init_user_ns, context->ipc.uid),
1210 from_kgid(&init_user_ns, context->ipc.gid),
1211 context->ipc.mode);
1212 if (osid) {
1213 char *ctx = NULL;
1214 u32 len;
1215 if (security_secid_to_secctx(osid, &ctx, &len)) {
1216 audit_log_format(ab, " osid=%u", osid);
1217 *call_panic = 1;
1218 } else {
1219 audit_log_format(ab, " obj=%s", ctx);
1220 security_release_secctx(ctx, len);
1221 }
1222 }
1223 if (context->ipc.has_perm) {
1224 audit_log_end(ab);
1225 ab = audit_log_start(context, GFP_KERNEL,
1226 AUDIT_IPC_SET_PERM);
1227 if (unlikely(!ab))
1228 return;
1229 audit_log_format(ab,
1230 "qbytes=%lx ouid=%u ogid=%u mode=%#ho",
1231 context->ipc.qbytes,
1232 context->ipc.perm_uid,
1233 context->ipc.perm_gid,
1234 context->ipc.perm_mode);
1235 }
1236 break; }
1237 case AUDIT_MQ_OPEN:
1238 audit_log_format(ab,
1239 "oflag=0x%x mode=%#ho mq_flags=0x%lx mq_maxmsg=%ld "
1240 "mq_msgsize=%ld mq_curmsgs=%ld",
1241 context->mq_open.oflag, context->mq_open.mode,
1242 context->mq_open.attr.mq_flags,
1243 context->mq_open.attr.mq_maxmsg,
1244 context->mq_open.attr.mq_msgsize,
1245 context->mq_open.attr.mq_curmsgs);
1246 break;
1247 case AUDIT_MQ_SENDRECV:
1248 audit_log_format(ab,
1249 "mqdes=%d msg_len=%zd msg_prio=%u "
1250 "abs_timeout_sec=%lld abs_timeout_nsec=%ld",
1251 context->mq_sendrecv.mqdes,
1252 context->mq_sendrecv.msg_len,
1253 context->mq_sendrecv.msg_prio,
1254 (long long) context->mq_sendrecv.abs_timeout.tv_sec,
1255 context->mq_sendrecv.abs_timeout.tv_nsec);
1256 break;
1257 case AUDIT_MQ_NOTIFY:
1258 audit_log_format(ab, "mqdes=%d sigev_signo=%d",
1259 context->mq_notify.mqdes,
1260 context->mq_notify.sigev_signo);
1261 break;
1262 case AUDIT_MQ_GETSETATTR: {
1263 struct mq_attr *attr = &context->mq_getsetattr.mqstat;
1264 audit_log_format(ab,
1265 "mqdes=%d mq_flags=0x%lx mq_maxmsg=%ld mq_msgsize=%ld "
1266 "mq_curmsgs=%ld ",
1267 context->mq_getsetattr.mqdes,
1268 attr->mq_flags, attr->mq_maxmsg,
1269 attr->mq_msgsize, attr->mq_curmsgs);
1270 break; }
1271 case AUDIT_CAPSET:
1272 audit_log_format(ab, "pid=%d", context->capset.pid);
1273 audit_log_cap(ab, "cap_pi", &context->capset.cap.inheritable);
1274 audit_log_cap(ab, "cap_pp", &context->capset.cap.permitted);
1275 audit_log_cap(ab, "cap_pe", &context->capset.cap.effective);
1276 audit_log_cap(ab, "cap_pa", &context->capset.cap.ambient);
1277 break;
1278 case AUDIT_MMAP:
1279 audit_log_format(ab, "fd=%d flags=0x%x", context->mmap.fd,
1280 context->mmap.flags);
1281 break;
1282 case AUDIT_EXECVE:
1283 audit_log_execve_info(context, &ab);
1284 break;
1285 case AUDIT_KERN_MODULE:
1286 audit_log_format(ab, "name=");
1287 if (context->module.name) {
1288 audit_log_untrustedstring(ab, context->module.name);
1289 } else
1290 audit_log_format(ab, "(null)");
1291
1292 break;
1293 }
1294 audit_log_end(ab);
1295}
1296
1297static inline int audit_proctitle_rtrim(char *proctitle, int len)
1298{
1299 char *end = proctitle + len - 1;
1300 while (end > proctitle && !isprint(*end))
1301 end--;
1302
1303 /* catch the case where proctitle is only 1 non-print character */
1304 len = end - proctitle + 1;
1305 len -= isprint(proctitle[len-1]) == 0;
1306 return len;
1307}
1308
1309/*
1310 * audit_log_name - produce AUDIT_PATH record from struct audit_names
1311 * @context: audit_context for the task
1312 * @n: audit_names structure with reportable details
1313 * @path: optional path to report instead of audit_names->name
1314 * @record_num: record number to report when handling a list of names
1315 * @call_panic: optional pointer to int that will be updated if secid fails
1316 */
1317static void audit_log_name(struct audit_context *context, struct audit_names *n,
1318 const struct path *path, int record_num, int *call_panic)
1319{
1320 struct audit_buffer *ab;
1321
1322 ab = audit_log_start(context, GFP_KERNEL, AUDIT_PATH);
1323 if (!ab)
1324 return;
1325
1326 audit_log_format(ab, "item=%d", record_num);
1327
1328 if (path)
1329 audit_log_d_path(ab, " name=", path);
1330 else if (n->name) {
1331 switch (n->name_len) {
1332 case AUDIT_NAME_FULL:
1333 /* log the full path */
1334 audit_log_format(ab, " name=");
1335 audit_log_untrustedstring(ab, n->name->name);
1336 break;
1337 case 0:
1338 /* name was specified as a relative path and the
1339 * directory component is the cwd
1340 */
1341 audit_log_d_path(ab, " name=", &context->pwd);
1342 break;
1343 default:
1344 /* log the name's directory component */
1345 audit_log_format(ab, " name=");
1346 audit_log_n_untrustedstring(ab, n->name->name,
1347 n->name_len);
1348 }
1349 } else
1350 audit_log_format(ab, " name=(null)");
1351
1352 if (n->ino != AUDIT_INO_UNSET)
1353 audit_log_format(ab, " inode=%lu dev=%02x:%02x mode=%#ho ouid=%u ogid=%u rdev=%02x:%02x",
1354 n->ino,
1355 MAJOR(n->dev),
1356 MINOR(n->dev),
1357 n->mode,
1358 from_kuid(&init_user_ns, n->uid),
1359 from_kgid(&init_user_ns, n->gid),
1360 MAJOR(n->rdev),
1361 MINOR(n->rdev));
1362 if (n->osid != 0) {
1363 char *ctx = NULL;
1364 u32 len;
1365
1366 if (security_secid_to_secctx(
1367 n->osid, &ctx, &len)) {
1368 audit_log_format(ab, " osid=%u", n->osid);
1369 if (call_panic)
1370 *call_panic = 2;
1371 } else {
1372 audit_log_format(ab, " obj=%s", ctx);
1373 security_release_secctx(ctx, len);
1374 }
1375 }
1376
1377 /* log the audit_names record type */
1378 switch (n->type) {
1379 case AUDIT_TYPE_NORMAL:
1380 audit_log_format(ab, " nametype=NORMAL");
1381 break;
1382 case AUDIT_TYPE_PARENT:
1383 audit_log_format(ab, " nametype=PARENT");
1384 break;
1385 case AUDIT_TYPE_CHILD_DELETE:
1386 audit_log_format(ab, " nametype=DELETE");
1387 break;
1388 case AUDIT_TYPE_CHILD_CREATE:
1389 audit_log_format(ab, " nametype=CREATE");
1390 break;
1391 default:
1392 audit_log_format(ab, " nametype=UNKNOWN");
1393 break;
1394 }
1395
1396 audit_log_fcaps(ab, n);
1397 audit_log_end(ab);
1398}
1399
1400static void audit_log_proctitle(void)
1401{
1402 int res;
1403 char *buf;
1404 char *msg = "(null)";
1405 int len = strlen(msg);
1406 struct audit_context *context = audit_context();
1407 struct audit_buffer *ab;
1408
1409 if (!context || context->dummy)
1410 return;
1411
1412 ab = audit_log_start(context, GFP_KERNEL, AUDIT_PROCTITLE);
1413 if (!ab)
1414 return; /* audit_panic or being filtered */
1415
1416 audit_log_format(ab, "proctitle=");
1417
1418 /* Not cached */
1419 if (!context->proctitle.value) {
1420 buf = kmalloc(MAX_PROCTITLE_AUDIT_LEN, GFP_KERNEL);
1421 if (!buf)
1422 goto out;
1423 /* Historically called this from procfs naming */
1424 res = get_cmdline(current, buf, MAX_PROCTITLE_AUDIT_LEN);
1425 if (res == 0) {
1426 kfree(buf);
1427 goto out;
1428 }
1429 res = audit_proctitle_rtrim(buf, res);
1430 if (res == 0) {
1431 kfree(buf);
1432 goto out;
1433 }
1434 context->proctitle.value = buf;
1435 context->proctitle.len = res;
1436 }
1437 msg = context->proctitle.value;
1438 len = context->proctitle.len;
1439out:
1440 audit_log_n_untrustedstring(ab, msg, len);
1441 audit_log_end(ab);
1442}
1443
1444static void audit_log_exit(void)
1445{
1446 int i, call_panic = 0;
1447 struct audit_context *context = audit_context();
1448 struct audit_buffer *ab;
1449 struct audit_aux_data *aux;
1450 struct audit_names *n;
1451
1452 context->personality = current->personality;
1453
1454 ab = audit_log_start(context, GFP_KERNEL, AUDIT_SYSCALL);
1455 if (!ab)
1456 return; /* audit_panic has been called */
1457 audit_log_format(ab, "arch=%x syscall=%d",
1458 context->arch, context->major);
1459 if (context->personality != PER_LINUX)
1460 audit_log_format(ab, " per=%lx", context->personality);
1461 if (context->return_valid)
1462 audit_log_format(ab, " success=%s exit=%ld",
1463 (context->return_valid==AUDITSC_SUCCESS)?"yes":"no",
1464 context->return_code);
1465
1466 audit_log_format(ab,
1467 " a0=%lx a1=%lx a2=%lx a3=%lx items=%d",
1468 context->argv[0],
1469 context->argv[1],
1470 context->argv[2],
1471 context->argv[3],
1472 context->name_count);
1473
1474 audit_log_task_info(ab);
1475 audit_log_key(ab, context->filterkey);
1476 audit_log_end(ab);
1477
1478 for (aux = context->aux; aux; aux = aux->next) {
1479
1480 ab = audit_log_start(context, GFP_KERNEL, aux->type);
1481 if (!ab)
1482 continue; /* audit_panic has been called */
1483
1484 switch (aux->type) {
1485
1486 case AUDIT_BPRM_FCAPS: {
1487 struct audit_aux_data_bprm_fcaps *axs = (void *)aux;
1488 audit_log_format(ab, "fver=%x", axs->fcap_ver);
1489 audit_log_cap(ab, "fp", &axs->fcap.permitted);
1490 audit_log_cap(ab, "fi", &axs->fcap.inheritable);
1491 audit_log_format(ab, " fe=%d", axs->fcap.fE);
1492 audit_log_cap(ab, "old_pp", &axs->old_pcap.permitted);
1493 audit_log_cap(ab, "old_pi", &axs->old_pcap.inheritable);
1494 audit_log_cap(ab, "old_pe", &axs->old_pcap.effective);
1495 audit_log_cap(ab, "old_pa", &axs->old_pcap.ambient);
1496 audit_log_cap(ab, "pp", &axs->new_pcap.permitted);
1497 audit_log_cap(ab, "pi", &axs->new_pcap.inheritable);
1498 audit_log_cap(ab, "pe", &axs->new_pcap.effective);
1499 audit_log_cap(ab, "pa", &axs->new_pcap.ambient);
1500 audit_log_format(ab, " frootid=%d",
1501 from_kuid(&init_user_ns,
1502 axs->fcap.rootid));
1503 break; }
1504
1505 }
1506 audit_log_end(ab);
1507 }
1508
1509 if (context->type)
1510 show_special(context, &call_panic);
1511
1512 if (context->fds[0] >= 0) {
1513 ab = audit_log_start(context, GFP_KERNEL, AUDIT_FD_PAIR);
1514 if (ab) {
1515 audit_log_format(ab, "fd0=%d fd1=%d",
1516 context->fds[0], context->fds[1]);
1517 audit_log_end(ab);
1518 }
1519 }
1520
1521 if (context->sockaddr_len) {
1522 ab = audit_log_start(context, GFP_KERNEL, AUDIT_SOCKADDR);
1523 if (ab) {
1524 audit_log_format(ab, "saddr=");
1525 audit_log_n_hex(ab, (void *)context->sockaddr,
1526 context->sockaddr_len);
1527 audit_log_end(ab);
1528 }
1529 }
1530
1531 for (aux = context->aux_pids; aux; aux = aux->next) {
1532 struct audit_aux_data_pids *axs = (void *)aux;
1533
1534 for (i = 0; i < axs->pid_count; i++)
1535 if (audit_log_pid_context(context, axs->target_pid[i],
1536 axs->target_auid[i],
1537 axs->target_uid[i],
1538 axs->target_sessionid[i],
1539 axs->target_sid[i],
1540 axs->target_comm[i]))
1541 call_panic = 1;
1542 }
1543
1544 if (context->target_pid &&
1545 audit_log_pid_context(context, context->target_pid,
1546 context->target_auid, context->target_uid,
1547 context->target_sessionid,
1548 context->target_sid, context->target_comm))
1549 call_panic = 1;
1550
1551 if (context->pwd.dentry && context->pwd.mnt) {
1552 ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD);
1553 if (ab) {
1554 audit_log_d_path(ab, "cwd=", &context->pwd);
1555 audit_log_end(ab);
1556 }
1557 }
1558
1559 i = 0;
1560 list_for_each_entry(n, &context->names_list, list) {
1561 if (n->hidden)
1562 continue;
1563 audit_log_name(context, n, NULL, i++, &call_panic);
1564 }
1565
1566 audit_log_proctitle();
1567
1568 /* Send end of event record to help user space know we are finished */
1569 ab = audit_log_start(context, GFP_KERNEL, AUDIT_EOE);
1570 if (ab)
1571 audit_log_end(ab);
1572 if (call_panic)
1573 audit_panic("error converting sid to string");
1574}
1575
1576/**
1577 * __audit_free - free a per-task audit context
1578 * @tsk: task whose audit context block to free
1579 *
1580 * Called from copy_process and do_exit
1581 */
1582void __audit_free(struct task_struct *tsk)
1583{
1584 struct audit_context *context = tsk->audit_context;
1585
1586 if (!context)
1587 return;
1588
1589 if (!list_empty(&context->killed_trees))
1590 audit_kill_trees(context);
1591
1592 /* We are called either by do_exit() or the fork() error handling code;
1593 * in the former case tsk == current and in the latter tsk is a
1594 * random task_struct that doesn't doesn't have any meaningful data we
1595 * need to log via audit_log_exit().
1596 */
1597 if (tsk == current && !context->dummy && context->in_syscall) {
1598 context->return_valid = 0;
1599 context->return_code = 0;
1600
1601 audit_filter_syscall(tsk, context,
1602 &audit_filter_list[AUDIT_FILTER_EXIT]);
1603 audit_filter_inodes(tsk, context);
1604 if (context->current_state == AUDIT_RECORD_CONTEXT)
1605 audit_log_exit();
1606 }
1607
1608 audit_set_context(tsk, NULL);
1609 audit_free_context(context);
1610}
1611
1612/**
1613 * __audit_syscall_entry - fill in an audit record at syscall entry
1614 * @major: major syscall type (function)
1615 * @a1: additional syscall register 1
1616 * @a2: additional syscall register 2
1617 * @a3: additional syscall register 3
1618 * @a4: additional syscall register 4
1619 *
1620 * Fill in audit context at syscall entry. This only happens if the
1621 * audit context was created when the task was created and the state or
1622 * filters demand the audit context be built. If the state from the
1623 * per-task filter or from the per-syscall filter is AUDIT_RECORD_CONTEXT,
1624 * then the record will be written at syscall exit time (otherwise, it
1625 * will only be written if another part of the kernel requests that it
1626 * be written).
1627 */
1628void __audit_syscall_entry(int major, unsigned long a1, unsigned long a2,
1629 unsigned long a3, unsigned long a4)
1630{
1631 struct audit_context *context = audit_context();
1632 enum audit_state state;
1633
1634 if (!audit_enabled || !context)
1635 return;
1636
1637 BUG_ON(context->in_syscall || context->name_count);
1638
1639 state = context->state;
1640 if (state == AUDIT_DISABLED)
1641 return;
1642
1643 context->dummy = !audit_n_rules;
1644 if (!context->dummy && state == AUDIT_BUILD_CONTEXT) {
1645 context->prio = 0;
1646 if (auditd_test_task(current))
1647 return;
1648 }
1649
1650 context->arch = syscall_get_arch(current);
1651 context->major = major;
1652 context->argv[0] = a1;
1653 context->argv[1] = a2;
1654 context->argv[2] = a3;
1655 context->argv[3] = a4;
1656 context->serial = 0;
1657 context->in_syscall = 1;
1658 context->current_state = state;
1659 context->ppid = 0;
1660 ktime_get_coarse_real_ts64(&context->ctime);
1661}
1662
1663/**
1664 * __audit_syscall_exit - deallocate audit context after a system call
1665 * @success: success value of the syscall
1666 * @return_code: return value of the syscall
1667 *
1668 * Tear down after system call. If the audit context has been marked as
1669 * auditable (either because of the AUDIT_RECORD_CONTEXT state from
1670 * filtering, or because some other part of the kernel wrote an audit
1671 * message), then write out the syscall information. In call cases,
1672 * free the names stored from getname().
1673 */
1674void __audit_syscall_exit(int success, long return_code)
1675{
1676 struct audit_context *context;
1677
1678 context = audit_context();
1679 if (!context)
1680 return;
1681
1682 if (!list_empty(&context->killed_trees))
1683 audit_kill_trees(context);
1684
1685 if (!context->dummy && context->in_syscall) {
1686 if (success)
1687 context->return_valid = AUDITSC_SUCCESS;
1688 else
1689 context->return_valid = AUDITSC_FAILURE;
1690
1691 /*
1692 * we need to fix up the return code in the audit logs if the
1693 * actual return codes are later going to be fixed up by the
1694 * arch specific signal handlers
1695 *
1696 * This is actually a test for:
1697 * (rc == ERESTARTSYS ) || (rc == ERESTARTNOINTR) ||
1698 * (rc == ERESTARTNOHAND) || (rc == ERESTART_RESTARTBLOCK)
1699 *
1700 * but is faster than a bunch of ||
1701 */
1702 if (unlikely(return_code <= -ERESTARTSYS) &&
1703 (return_code >= -ERESTART_RESTARTBLOCK) &&
1704 (return_code != -ENOIOCTLCMD))
1705 context->return_code = -EINTR;
1706 else
1707 context->return_code = return_code;
1708
1709 audit_filter_syscall(current, context,
1710 &audit_filter_list[AUDIT_FILTER_EXIT]);
1711 audit_filter_inodes(current, context);
1712 if (context->current_state == AUDIT_RECORD_CONTEXT)
1713 audit_log_exit();
1714 }
1715
1716 context->in_syscall = 0;
1717 context->prio = context->state == AUDIT_RECORD_CONTEXT ? ~0ULL : 0;
1718
1719 audit_free_module(context);
1720 audit_free_names(context);
1721 unroll_tree_refs(context, NULL, 0);
1722 audit_free_aux(context);
1723 context->aux = NULL;
1724 context->aux_pids = NULL;
1725 context->target_pid = 0;
1726 context->target_sid = 0;
1727 context->sockaddr_len = 0;
1728 context->type = 0;
1729 context->fds[0] = -1;
1730 if (context->state != AUDIT_RECORD_CONTEXT) {
1731 kfree(context->filterkey);
1732 context->filterkey = NULL;
1733 }
1734}
1735
1736static inline void handle_one(const struct inode *inode)
1737{
1738 struct audit_context *context;
1739 struct audit_tree_refs *p;
1740 struct audit_chunk *chunk;
1741 int count;
1742 if (likely(!inode->i_fsnotify_marks))
1743 return;
1744 context = audit_context();
1745 p = context->trees;
1746 count = context->tree_count;
1747 rcu_read_lock();
1748 chunk = audit_tree_lookup(inode);
1749 rcu_read_unlock();
1750 if (!chunk)
1751 return;
1752 if (likely(put_tree_ref(context, chunk)))
1753 return;
1754 if (unlikely(!grow_tree_refs(context))) {
1755 pr_warn("out of memory, audit has lost a tree reference\n");
1756 audit_set_auditable(context);
1757 audit_put_chunk(chunk);
1758 unroll_tree_refs(context, p, count);
1759 return;
1760 }
1761 put_tree_ref(context, chunk);
1762}
1763
1764static void handle_path(const struct dentry *dentry)
1765{
1766 struct audit_context *context;
1767 struct audit_tree_refs *p;
1768 const struct dentry *d, *parent;
1769 struct audit_chunk *drop;
1770 unsigned long seq;
1771 int count;
1772
1773 context = audit_context();
1774 p = context->trees;
1775 count = context->tree_count;
1776retry:
1777 drop = NULL;
1778 d = dentry;
1779 rcu_read_lock();
1780 seq = read_seqbegin(&rename_lock);
1781 for(;;) {
1782 struct inode *inode = d_backing_inode(d);
1783 if (inode && unlikely(inode->i_fsnotify_marks)) {
1784 struct audit_chunk *chunk;
1785 chunk = audit_tree_lookup(inode);
1786 if (chunk) {
1787 if (unlikely(!put_tree_ref(context, chunk))) {
1788 drop = chunk;
1789 break;
1790 }
1791 }
1792 }
1793 parent = d->d_parent;
1794 if (parent == d)
1795 break;
1796 d = parent;
1797 }
1798 if (unlikely(read_seqretry(&rename_lock, seq) || drop)) { /* in this order */
1799 rcu_read_unlock();
1800 if (!drop) {
1801 /* just a race with rename */
1802 unroll_tree_refs(context, p, count);
1803 goto retry;
1804 }
1805 audit_put_chunk(drop);
1806 if (grow_tree_refs(context)) {
1807 /* OK, got more space */
1808 unroll_tree_refs(context, p, count);
1809 goto retry;
1810 }
1811 /* too bad */
1812 pr_warn("out of memory, audit has lost a tree reference\n");
1813 unroll_tree_refs(context, p, count);
1814 audit_set_auditable(context);
1815 return;
1816 }
1817 rcu_read_unlock();
1818}
1819
1820static struct audit_names *audit_alloc_name(struct audit_context *context,
1821 unsigned char type)
1822{
1823 struct audit_names *aname;
1824
1825 if (context->name_count < AUDIT_NAMES) {
1826 aname = &context->preallocated_names[context->name_count];
1827 memset(aname, 0, sizeof(*aname));
1828 } else {
1829 aname = kzalloc(sizeof(*aname), GFP_NOFS);
1830 if (!aname)
1831 return NULL;
1832 aname->should_free = true;
1833 }
1834
1835 aname->ino = AUDIT_INO_UNSET;
1836 aname->type = type;
1837 list_add_tail(&aname->list, &context->names_list);
1838
1839 context->name_count++;
1840 return aname;
1841}
1842
1843/**
1844 * __audit_reusename - fill out filename with info from existing entry
1845 * @uptr: userland ptr to pathname
1846 *
1847 * Search the audit_names list for the current audit context. If there is an
1848 * existing entry with a matching "uptr" then return the filename
1849 * associated with that audit_name. If not, return NULL.
1850 */
1851struct filename *
1852__audit_reusename(const __user char *uptr)
1853{
1854 struct audit_context *context = audit_context();
1855 struct audit_names *n;
1856
1857 list_for_each_entry(n, &context->names_list, list) {
1858 if (!n->name)
1859 continue;
1860 if (n->name->uptr == uptr) {
1861 n->name->refcnt++;
1862 return n->name;
1863 }
1864 }
1865 return NULL;
1866}
1867
1868/**
1869 * __audit_getname - add a name to the list
1870 * @name: name to add
1871 *
1872 * Add a name to the list of audit names for this context.
1873 * Called from fs/namei.c:getname().
1874 */
1875void __audit_getname(struct filename *name)
1876{
1877 struct audit_context *context = audit_context();
1878 struct audit_names *n;
1879
1880 if (!context->in_syscall)
1881 return;
1882
1883 n = audit_alloc_name(context, AUDIT_TYPE_UNKNOWN);
1884 if (!n)
1885 return;
1886
1887 n->name = name;
1888 n->name_len = AUDIT_NAME_FULL;
1889 name->aname = n;
1890 name->refcnt++;
1891
1892 if (!context->pwd.dentry)
1893 get_fs_pwd(current->fs, &context->pwd);
1894}
1895
1896static inline int audit_copy_fcaps(struct audit_names *name,
1897 const struct dentry *dentry)
1898{
1899 struct cpu_vfs_cap_data caps;
1900 int rc;
1901
1902 if (!dentry)
1903 return 0;
1904
1905 rc = get_vfs_caps_from_disk(dentry, &caps);
1906 if (rc)
1907 return rc;
1908
1909 name->fcap.permitted = caps.permitted;
1910 name->fcap.inheritable = caps.inheritable;
1911 name->fcap.fE = !!(caps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE);
1912 name->fcap.rootid = caps.rootid;
1913 name->fcap_ver = (caps.magic_etc & VFS_CAP_REVISION_MASK) >>
1914 VFS_CAP_REVISION_SHIFT;
1915
1916 return 0;
1917}
1918
1919/* Copy inode data into an audit_names. */
1920static void audit_copy_inode(struct audit_names *name,
1921 const struct dentry *dentry,
1922 struct inode *inode, unsigned int flags)
1923{
1924 name->ino = inode->i_ino;
1925 name->dev = inode->i_sb->s_dev;
1926 name->mode = inode->i_mode;
1927 name->uid = inode->i_uid;
1928 name->gid = inode->i_gid;
1929 name->rdev = inode->i_rdev;
1930 security_inode_getsecid(inode, &name->osid);
1931 if (flags & AUDIT_INODE_NOEVAL) {
1932 name->fcap_ver = -1;
1933 return;
1934 }
1935 audit_copy_fcaps(name, dentry);
1936}
1937
1938/**
1939 * __audit_inode - store the inode and device from a lookup
1940 * @name: name being audited
1941 * @dentry: dentry being audited
1942 * @flags: attributes for this particular entry
1943 */
1944void __audit_inode(struct filename *name, const struct dentry *dentry,
1945 unsigned int flags)
1946{
1947 struct audit_context *context = audit_context();
1948 struct inode *inode = d_backing_inode(dentry);
1949 struct audit_names *n;
1950 bool parent = flags & AUDIT_INODE_PARENT;
1951 struct audit_entry *e;
1952 struct list_head *list = &audit_filter_list[AUDIT_FILTER_FS];
1953 int i;
1954
1955 if (!context->in_syscall)
1956 return;
1957
1958 rcu_read_lock();
1959 list_for_each_entry_rcu(e, list, list) {
1960 for (i = 0; i < e->rule.field_count; i++) {
1961 struct audit_field *f = &e->rule.fields[i];
1962
1963 if (f->type == AUDIT_FSTYPE
1964 && audit_comparator(inode->i_sb->s_magic,
1965 f->op, f->val)
1966 && e->rule.action == AUDIT_NEVER) {
1967 rcu_read_unlock();
1968 return;
1969 }
1970 }
1971 }
1972 rcu_read_unlock();
1973
1974 if (!name)
1975 goto out_alloc;
1976
1977 /*
1978 * If we have a pointer to an audit_names entry already, then we can
1979 * just use it directly if the type is correct.
1980 */
1981 n = name->aname;
1982 if (n) {
1983 if (parent) {
1984 if (n->type == AUDIT_TYPE_PARENT ||
1985 n->type == AUDIT_TYPE_UNKNOWN)
1986 goto out;
1987 } else {
1988 if (n->type != AUDIT_TYPE_PARENT)
1989 goto out;
1990 }
1991 }
1992
1993 list_for_each_entry_reverse(n, &context->names_list, list) {
1994 if (n->ino) {
1995 /* valid inode number, use that for the comparison */
1996 if (n->ino != inode->i_ino ||
1997 n->dev != inode->i_sb->s_dev)
1998 continue;
1999 } else if (n->name) {
2000 /* inode number has not been set, check the name */
2001 if (strcmp(n->name->name, name->name))
2002 continue;
2003 } else
2004 /* no inode and no name (?!) ... this is odd ... */
2005 continue;
2006
2007 /* match the correct record type */
2008 if (parent) {
2009 if (n->type == AUDIT_TYPE_PARENT ||
2010 n->type == AUDIT_TYPE_UNKNOWN)
2011 goto out;
2012 } else {
2013 if (n->type != AUDIT_TYPE_PARENT)
2014 goto out;
2015 }
2016 }
2017
2018out_alloc:
2019 /* unable to find an entry with both a matching name and type */
2020 n = audit_alloc_name(context, AUDIT_TYPE_UNKNOWN);
2021 if (!n)
2022 return;
2023 if (name) {
2024 n->name = name;
2025 name->refcnt++;
2026 }
2027
2028out:
2029 if (parent) {
2030 n->name_len = n->name ? parent_len(n->name->name) : AUDIT_NAME_FULL;
2031 n->type = AUDIT_TYPE_PARENT;
2032 if (flags & AUDIT_INODE_HIDDEN)
2033 n->hidden = true;
2034 } else {
2035 n->name_len = AUDIT_NAME_FULL;
2036 n->type = AUDIT_TYPE_NORMAL;
2037 }
2038 handle_path(dentry);
2039 audit_copy_inode(n, dentry, inode, flags & AUDIT_INODE_NOEVAL);
2040}
2041
2042void __audit_file(const struct file *file)
2043{
2044 __audit_inode(NULL, file->f_path.dentry, 0);
2045}
2046
2047/**
2048 * __audit_inode_child - collect inode info for created/removed objects
2049 * @parent: inode of dentry parent
2050 * @dentry: dentry being audited
2051 * @type: AUDIT_TYPE_* value that we're looking for
2052 *
2053 * For syscalls that create or remove filesystem objects, audit_inode
2054 * can only collect information for the filesystem object's parent.
2055 * This call updates the audit context with the child's information.
2056 * Syscalls that create a new filesystem object must be hooked after
2057 * the object is created. Syscalls that remove a filesystem object
2058 * must be hooked prior, in order to capture the target inode during
2059 * unsuccessful attempts.
2060 */
2061void __audit_inode_child(struct inode *parent,
2062 const struct dentry *dentry,
2063 const unsigned char type)
2064{
2065 struct audit_context *context = audit_context();
2066 struct inode *inode = d_backing_inode(dentry);
2067 const struct qstr *dname = &dentry->d_name;
2068 struct audit_names *n, *found_parent = NULL, *found_child = NULL;
2069 struct audit_entry *e;
2070 struct list_head *list = &audit_filter_list[AUDIT_FILTER_FS];
2071 int i;
2072
2073 if (!context->in_syscall)
2074 return;
2075
2076 rcu_read_lock();
2077 list_for_each_entry_rcu(e, list, list) {
2078 for (i = 0; i < e->rule.field_count; i++) {
2079 struct audit_field *f = &e->rule.fields[i];
2080
2081 if (f->type == AUDIT_FSTYPE
2082 && audit_comparator(parent->i_sb->s_magic,
2083 f->op, f->val)
2084 && e->rule.action == AUDIT_NEVER) {
2085 rcu_read_unlock();
2086 return;
2087 }
2088 }
2089 }
2090 rcu_read_unlock();
2091
2092 if (inode)
2093 handle_one(inode);
2094
2095 /* look for a parent entry first */
2096 list_for_each_entry(n, &context->names_list, list) {
2097 if (!n->name ||
2098 (n->type != AUDIT_TYPE_PARENT &&
2099 n->type != AUDIT_TYPE_UNKNOWN))
2100 continue;
2101
2102 if (n->ino == parent->i_ino && n->dev == parent->i_sb->s_dev &&
2103 !audit_compare_dname_path(dname,
2104 n->name->name, n->name_len)) {
2105 if (n->type == AUDIT_TYPE_UNKNOWN)
2106 n->type = AUDIT_TYPE_PARENT;
2107 found_parent = n;
2108 break;
2109 }
2110 }
2111
2112 /* is there a matching child entry? */
2113 list_for_each_entry(n, &context->names_list, list) {
2114 /* can only match entries that have a name */
2115 if (!n->name ||
2116 (n->type != type && n->type != AUDIT_TYPE_UNKNOWN))
2117 continue;
2118
2119 if (!strcmp(dname->name, n->name->name) ||
2120 !audit_compare_dname_path(dname, n->name->name,
2121 found_parent ?
2122 found_parent->name_len :
2123 AUDIT_NAME_FULL)) {
2124 if (n->type == AUDIT_TYPE_UNKNOWN)
2125 n->type = type;
2126 found_child = n;
2127 break;
2128 }
2129 }
2130
2131 if (!found_parent) {
2132 /* create a new, "anonymous" parent record */
2133 n = audit_alloc_name(context, AUDIT_TYPE_PARENT);
2134 if (!n)
2135 return;
2136 audit_copy_inode(n, NULL, parent, 0);
2137 }
2138
2139 if (!found_child) {
2140 found_child = audit_alloc_name(context, type);
2141 if (!found_child)
2142 return;
2143
2144 /* Re-use the name belonging to the slot for a matching parent
2145 * directory. All names for this context are relinquished in
2146 * audit_free_names() */
2147 if (found_parent) {
2148 found_child->name = found_parent->name;
2149 found_child->name_len = AUDIT_NAME_FULL;
2150 found_child->name->refcnt++;
2151 }
2152 }
2153
2154 if (inode)
2155 audit_copy_inode(found_child, dentry, inode, 0);
2156 else
2157 found_child->ino = AUDIT_INO_UNSET;
2158}
2159EXPORT_SYMBOL_GPL(__audit_inode_child);
2160
2161/**
2162 * auditsc_get_stamp - get local copies of audit_context values
2163 * @ctx: audit_context for the task
2164 * @t: timespec64 to store time recorded in the audit_context
2165 * @serial: serial value that is recorded in the audit_context
2166 *
2167 * Also sets the context as auditable.
2168 */
2169int auditsc_get_stamp(struct audit_context *ctx,
2170 struct timespec64 *t, unsigned int *serial)
2171{
2172 if (!ctx->in_syscall)
2173 return 0;
2174 if (!ctx->serial)
2175 ctx->serial = audit_serial();
2176 t->tv_sec = ctx->ctime.tv_sec;
2177 t->tv_nsec = ctx->ctime.tv_nsec;
2178 *serial = ctx->serial;
2179 if (!ctx->prio) {
2180 ctx->prio = 1;
2181 ctx->current_state = AUDIT_RECORD_CONTEXT;
2182 }
2183 return 1;
2184}
2185
2186/**
2187 * __audit_mq_open - record audit data for a POSIX MQ open
2188 * @oflag: open flag
2189 * @mode: mode bits
2190 * @attr: queue attributes
2191 *
2192 */
2193void __audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr)
2194{
2195 struct audit_context *context = audit_context();
2196
2197 if (attr)
2198 memcpy(&context->mq_open.attr, attr, sizeof(struct mq_attr));
2199 else
2200 memset(&context->mq_open.attr, 0, sizeof(struct mq_attr));
2201
2202 context->mq_open.oflag = oflag;
2203 context->mq_open.mode = mode;
2204
2205 context->type = AUDIT_MQ_OPEN;
2206}
2207
2208/**
2209 * __audit_mq_sendrecv - record audit data for a POSIX MQ timed send/receive
2210 * @mqdes: MQ descriptor
2211 * @msg_len: Message length
2212 * @msg_prio: Message priority
2213 * @abs_timeout: Message timeout in absolute time
2214 *
2215 */
2216void __audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio,
2217 const struct timespec64 *abs_timeout)
2218{
2219 struct audit_context *context = audit_context();
2220 struct timespec64 *p = &context->mq_sendrecv.abs_timeout;
2221
2222 if (abs_timeout)
2223 memcpy(p, abs_timeout, sizeof(*p));
2224 else
2225 memset(p, 0, sizeof(*p));
2226
2227 context->mq_sendrecv.mqdes = mqdes;
2228 context->mq_sendrecv.msg_len = msg_len;
2229 context->mq_sendrecv.msg_prio = msg_prio;
2230
2231 context->type = AUDIT_MQ_SENDRECV;
2232}
2233
2234/**
2235 * __audit_mq_notify - record audit data for a POSIX MQ notify
2236 * @mqdes: MQ descriptor
2237 * @notification: Notification event
2238 *
2239 */
2240
2241void __audit_mq_notify(mqd_t mqdes, const struct sigevent *notification)
2242{
2243 struct audit_context *context = audit_context();
2244
2245 if (notification)
2246 context->mq_notify.sigev_signo = notification->sigev_signo;
2247 else
2248 context->mq_notify.sigev_signo = 0;
2249
2250 context->mq_notify.mqdes = mqdes;
2251 context->type = AUDIT_MQ_NOTIFY;
2252}
2253
2254/**
2255 * __audit_mq_getsetattr - record audit data for a POSIX MQ get/set attribute
2256 * @mqdes: MQ descriptor
2257 * @mqstat: MQ flags
2258 *
2259 */
2260void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
2261{
2262 struct audit_context *context = audit_context();
2263 context->mq_getsetattr.mqdes = mqdes;
2264 context->mq_getsetattr.mqstat = *mqstat;
2265 context->type = AUDIT_MQ_GETSETATTR;
2266}
2267
2268/**
2269 * __audit_ipc_obj - record audit data for ipc object
2270 * @ipcp: ipc permissions
2271 *
2272 */
2273void __audit_ipc_obj(struct kern_ipc_perm *ipcp)
2274{
2275 struct audit_context *context = audit_context();
2276 context->ipc.uid = ipcp->uid;
2277 context->ipc.gid = ipcp->gid;
2278 context->ipc.mode = ipcp->mode;
2279 context->ipc.has_perm = 0;
2280 security_ipc_getsecid(ipcp, &context->ipc.osid);
2281 context->type = AUDIT_IPC;
2282}
2283
2284/**
2285 * __audit_ipc_set_perm - record audit data for new ipc permissions
2286 * @qbytes: msgq bytes
2287 * @uid: msgq user id
2288 * @gid: msgq group id
2289 * @mode: msgq mode (permissions)
2290 *
2291 * Called only after audit_ipc_obj().
2292 */
2293void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode)
2294{
2295 struct audit_context *context = audit_context();
2296
2297 context->ipc.qbytes = qbytes;
2298 context->ipc.perm_uid = uid;
2299 context->ipc.perm_gid = gid;
2300 context->ipc.perm_mode = mode;
2301 context->ipc.has_perm = 1;
2302}
2303
2304void __audit_bprm(struct linux_binprm *bprm)
2305{
2306 struct audit_context *context = audit_context();
2307
2308 context->type = AUDIT_EXECVE;
2309 context->execve.argc = bprm->argc;
2310}
2311
2312
2313/**
2314 * __audit_socketcall - record audit data for sys_socketcall
2315 * @nargs: number of args, which should not be more than AUDITSC_ARGS.
2316 * @args: args array
2317 *
2318 */
2319int __audit_socketcall(int nargs, unsigned long *args)
2320{
2321 struct audit_context *context = audit_context();
2322
2323 if (nargs <= 0 || nargs > AUDITSC_ARGS || !args)
2324 return -EINVAL;
2325 context->type = AUDIT_SOCKETCALL;
2326 context->socketcall.nargs = nargs;
2327 memcpy(context->socketcall.args, args, nargs * sizeof(unsigned long));
2328 return 0;
2329}
2330
2331/**
2332 * __audit_fd_pair - record audit data for pipe and socketpair
2333 * @fd1: the first file descriptor
2334 * @fd2: the second file descriptor
2335 *
2336 */
2337void __audit_fd_pair(int fd1, int fd2)
2338{
2339 struct audit_context *context = audit_context();
2340 context->fds[0] = fd1;
2341 context->fds[1] = fd2;
2342}
2343
2344/**
2345 * __audit_sockaddr - record audit data for sys_bind, sys_connect, sys_sendto
2346 * @len: data length in user space
2347 * @a: data address in kernel space
2348 *
2349 * Returns 0 for success or NULL context or < 0 on error.
2350 */
2351int __audit_sockaddr(int len, void *a)
2352{
2353 struct audit_context *context = audit_context();
2354
2355 if (!context->sockaddr) {
2356 void *p = kmalloc(sizeof(struct sockaddr_storage), GFP_KERNEL);
2357 if (!p)
2358 return -ENOMEM;
2359 context->sockaddr = p;
2360 }
2361
2362 context->sockaddr_len = len;
2363 memcpy(context->sockaddr, a, len);
2364 return 0;
2365}
2366
2367void __audit_ptrace(struct task_struct *t)
2368{
2369 struct audit_context *context = audit_context();
2370
2371 context->target_pid = task_tgid_nr(t);
2372 context->target_auid = audit_get_loginuid(t);
2373 context->target_uid = task_uid(t);
2374 context->target_sessionid = audit_get_sessionid(t);
2375 security_task_getsecid(t, &context->target_sid);
2376 memcpy(context->target_comm, t->comm, TASK_COMM_LEN);
2377}
2378
2379/**
2380 * audit_signal_info_syscall - record signal info for syscalls
2381 * @t: task being signaled
2382 *
2383 * If the audit subsystem is being terminated, record the task (pid)
2384 * and uid that is doing that.
2385 */
2386int audit_signal_info_syscall(struct task_struct *t)
2387{
2388 struct audit_aux_data_pids *axp;
2389 struct audit_context *ctx = audit_context();
2390 kuid_t t_uid = task_uid(t);
2391
2392 if (!audit_signals || audit_dummy_context())
2393 return 0;
2394
2395 /* optimize the common case by putting first signal recipient directly
2396 * in audit_context */
2397 if (!ctx->target_pid) {
2398 ctx->target_pid = task_tgid_nr(t);
2399 ctx->target_auid = audit_get_loginuid(t);
2400 ctx->target_uid = t_uid;
2401 ctx->target_sessionid = audit_get_sessionid(t);
2402 security_task_getsecid(t, &ctx->target_sid);
2403 memcpy(ctx->target_comm, t->comm, TASK_COMM_LEN);
2404 return 0;
2405 }
2406
2407 axp = (void *)ctx->aux_pids;
2408 if (!axp || axp->pid_count == AUDIT_AUX_PIDS) {
2409 axp = kzalloc(sizeof(*axp), GFP_ATOMIC);
2410 if (!axp)
2411 return -ENOMEM;
2412
2413 axp->d.type = AUDIT_OBJ_PID;
2414 axp->d.next = ctx->aux_pids;
2415 ctx->aux_pids = (void *)axp;
2416 }
2417 BUG_ON(axp->pid_count >= AUDIT_AUX_PIDS);
2418
2419 axp->target_pid[axp->pid_count] = task_tgid_nr(t);
2420 axp->target_auid[axp->pid_count] = audit_get_loginuid(t);
2421 axp->target_uid[axp->pid_count] = t_uid;
2422 axp->target_sessionid[axp->pid_count] = audit_get_sessionid(t);
2423 security_task_getsecid(t, &axp->target_sid[axp->pid_count]);
2424 memcpy(axp->target_comm[axp->pid_count], t->comm, TASK_COMM_LEN);
2425 axp->pid_count++;
2426
2427 return 0;
2428}
2429
2430/**
2431 * __audit_log_bprm_fcaps - store information about a loading bprm and relevant fcaps
2432 * @bprm: pointer to the bprm being processed
2433 * @new: the proposed new credentials
2434 * @old: the old credentials
2435 *
2436 * Simply check if the proc already has the caps given by the file and if not
2437 * store the priv escalation info for later auditing at the end of the syscall
2438 *
2439 * -Eric
2440 */
2441int __audit_log_bprm_fcaps(struct linux_binprm *bprm,
2442 const struct cred *new, const struct cred *old)
2443{
2444 struct audit_aux_data_bprm_fcaps *ax;
2445 struct audit_context *context = audit_context();
2446 struct cpu_vfs_cap_data vcaps;
2447
2448 ax = kmalloc(sizeof(*ax), GFP_KERNEL);
2449 if (!ax)
2450 return -ENOMEM;
2451
2452 ax->d.type = AUDIT_BPRM_FCAPS;
2453 ax->d.next = context->aux;
2454 context->aux = (void *)ax;
2455
2456 get_vfs_caps_from_disk(bprm->file->f_path.dentry, &vcaps);
2457
2458 ax->fcap.permitted = vcaps.permitted;
2459 ax->fcap.inheritable = vcaps.inheritable;
2460 ax->fcap.fE = !!(vcaps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE);
2461 ax->fcap.rootid = vcaps.rootid;
2462 ax->fcap_ver = (vcaps.magic_etc & VFS_CAP_REVISION_MASK) >> VFS_CAP_REVISION_SHIFT;
2463
2464 ax->old_pcap.permitted = old->cap_permitted;
2465 ax->old_pcap.inheritable = old->cap_inheritable;
2466 ax->old_pcap.effective = old->cap_effective;
2467 ax->old_pcap.ambient = old->cap_ambient;
2468
2469 ax->new_pcap.permitted = new->cap_permitted;
2470 ax->new_pcap.inheritable = new->cap_inheritable;
2471 ax->new_pcap.effective = new->cap_effective;
2472 ax->new_pcap.ambient = new->cap_ambient;
2473 return 0;
2474}
2475
2476/**
2477 * __audit_log_capset - store information about the arguments to the capset syscall
2478 * @new: the new credentials
2479 * @old: the old (current) credentials
2480 *
2481 * Record the arguments userspace sent to sys_capset for later printing by the
2482 * audit system if applicable
2483 */
2484void __audit_log_capset(const struct cred *new, const struct cred *old)
2485{
2486 struct audit_context *context = audit_context();
2487 context->capset.pid = task_tgid_nr(current);
2488 context->capset.cap.effective = new->cap_effective;
2489 context->capset.cap.inheritable = new->cap_effective;
2490 context->capset.cap.permitted = new->cap_permitted;
2491 context->capset.cap.ambient = new->cap_ambient;
2492 context->type = AUDIT_CAPSET;
2493}
2494
2495void __audit_mmap_fd(int fd, int flags)
2496{
2497 struct audit_context *context = audit_context();
2498 context->mmap.fd = fd;
2499 context->mmap.flags = flags;
2500 context->type = AUDIT_MMAP;
2501}
2502
2503void __audit_log_kern_module(char *name)
2504{
2505 struct audit_context *context = audit_context();
2506
2507 context->module.name = kstrdup(name, GFP_KERNEL);
2508 if (!context->module.name)
2509 audit_log_lost("out of memory in __audit_log_kern_module");
2510 context->type = AUDIT_KERN_MODULE;
2511}
2512
2513void __audit_fanotify(unsigned int response)
2514{
2515 audit_log(audit_context(), GFP_KERNEL,
2516 AUDIT_FANOTIFY, "resp=%u", response);
2517}
2518
2519void __audit_tk_injoffset(struct timespec64 offset)
2520{
2521 audit_log(audit_context(), GFP_KERNEL, AUDIT_TIME_INJOFFSET,
2522 "sec=%lli nsec=%li",
2523 (long long)offset.tv_sec, offset.tv_nsec);
2524}
2525
2526static void audit_log_ntp_val(const struct audit_ntp_data *ad,
2527 const char *op, enum audit_ntp_type type)
2528{
2529 const struct audit_ntp_val *val = &ad->vals[type];
2530
2531 if (val->newval == val->oldval)
2532 return;
2533
2534 audit_log(audit_context(), GFP_KERNEL, AUDIT_TIME_ADJNTPVAL,
2535 "op=%s old=%lli new=%lli", op, val->oldval, val->newval);
2536}
2537
2538void __audit_ntp_log(const struct audit_ntp_data *ad)
2539{
2540 audit_log_ntp_val(ad, "offset", AUDIT_NTP_OFFSET);
2541 audit_log_ntp_val(ad, "freq", AUDIT_NTP_FREQ);
2542 audit_log_ntp_val(ad, "status", AUDIT_NTP_STATUS);
2543 audit_log_ntp_val(ad, "tai", AUDIT_NTP_TAI);
2544 audit_log_ntp_val(ad, "tick", AUDIT_NTP_TICK);
2545 audit_log_ntp_val(ad, "adjust", AUDIT_NTP_ADJUST);
2546}
2547
2548static void audit_log_task(struct audit_buffer *ab)
2549{
2550 kuid_t auid, uid;
2551 kgid_t gid;
2552 unsigned int sessionid;
2553 char comm[sizeof(current->comm)];
2554
2555 auid = audit_get_loginuid(current);
2556 sessionid = audit_get_sessionid(current);
2557 current_uid_gid(&uid, &gid);
2558
2559 audit_log_format(ab, "auid=%u uid=%u gid=%u ses=%u",
2560 from_kuid(&init_user_ns, auid),
2561 from_kuid(&init_user_ns, uid),
2562 from_kgid(&init_user_ns, gid),
2563 sessionid);
2564 audit_log_task_context(ab);
2565 audit_log_format(ab, " pid=%d comm=", task_tgid_nr(current));
2566 audit_log_untrustedstring(ab, get_task_comm(comm, current));
2567 audit_log_d_path_exe(ab, current->mm);
2568}
2569
2570/**
2571 * audit_core_dumps - record information about processes that end abnormally
2572 * @signr: signal value
2573 *
2574 * If a process ends with a core dump, something fishy is going on and we
2575 * should record the event for investigation.
2576 */
2577void audit_core_dumps(long signr)
2578{
2579 struct audit_buffer *ab;
2580
2581 if (!audit_enabled)
2582 return;
2583
2584 if (signr == SIGQUIT) /* don't care for those */
2585 return;
2586
2587 ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_ANOM_ABEND);
2588 if (unlikely(!ab))
2589 return;
2590 audit_log_task(ab);
2591 audit_log_format(ab, " sig=%ld res=1", signr);
2592 audit_log_end(ab);
2593}
2594
2595/**
2596 * audit_seccomp - record information about a seccomp action
2597 * @syscall: syscall number
2598 * @signr: signal value
2599 * @code: the seccomp action
2600 *
2601 * Record the information associated with a seccomp action. Event filtering for
2602 * seccomp actions that are not to be logged is done in seccomp_log().
2603 * Therefore, this function forces auditing independent of the audit_enabled
2604 * and dummy context state because seccomp actions should be logged even when
2605 * audit is not in use.
2606 */
2607void audit_seccomp(unsigned long syscall, long signr, int code)
2608{
2609 struct audit_buffer *ab;
2610
2611 ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_SECCOMP);
2612 if (unlikely(!ab))
2613 return;
2614 audit_log_task(ab);
2615 audit_log_format(ab, " sig=%ld arch=%x syscall=%ld compat=%d ip=0x%lx code=0x%x",
2616 signr, syscall_get_arch(current), syscall,
2617 in_compat_syscall(), KSTK_EIP(current), code);
2618 audit_log_end(ab);
2619}
2620
2621void audit_seccomp_actions_logged(const char *names, const char *old_names,
2622 int res)
2623{
2624 struct audit_buffer *ab;
2625
2626 if (!audit_enabled)
2627 return;
2628
2629 ab = audit_log_start(audit_context(), GFP_KERNEL,
2630 AUDIT_CONFIG_CHANGE);
2631 if (unlikely(!ab))
2632 return;
2633
2634 audit_log_format(ab,
2635 "op=seccomp-logging actions=%s old-actions=%s res=%d",
2636 names, old_names, res);
2637 audit_log_end(ab);
2638}
2639
2640struct list_head *audit_killed_trees(void)
2641{
2642 struct audit_context *ctx = audit_context();
2643 if (likely(!ctx || !ctx->in_syscall))
2644 return NULL;
2645 return &ctx->killed_trees;
2646}
1/* auditsc.c -- System-call auditing support
2 * Handles all system-call specific auditing features.
3 *
4 * Copyright 2003-2004 Red Hat Inc., Durham, North Carolina.
5 * Copyright 2005 Hewlett-Packard Development Company, L.P.
6 * Copyright (C) 2005, 2006 IBM Corporation
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 *
32 * POSIX message queue support added by George Wilson <ltcgcw@us.ibm.com>,
33 * 2006.
34 *
35 * The support of additional filter rules compares (>, <, >=, <=) was
36 * added by Dustin Kirkland <dustin.kirkland@us.ibm.com>, 2005.
37 *
38 * Modified by Amy Griffis <amy.griffis@hp.com> to collect additional
39 * filesystem information.
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.
43 */
44
45#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
46
47#include <linux/init.h>
48#include <asm/types.h>
49#include <linux/atomic.h>
50#include <linux/fs.h>
51#include <linux/namei.h>
52#include <linux/mm.h>
53#include <linux/export.h>
54#include <linux/slab.h>
55#include <linux/mount.h>
56#include <linux/socket.h>
57#include <linux/mqueue.h>
58#include <linux/audit.h>
59#include <linux/personality.h>
60#include <linux/time.h>
61#include <linux/netlink.h>
62#include <linux/compiler.h>
63#include <asm/unistd.h>
64#include <linux/security.h>
65#include <linux/list.h>
66#include <linux/tty.h>
67#include <linux/binfmts.h>
68#include <linux/highmem.h>
69#include <linux/syscalls.h>
70#include <asm/syscall.h>
71#include <linux/capability.h>
72#include <linux/fs_struct.h>
73#include <linux/compat.h>
74#include <linux/ctype.h>
75#include <linux/string.h>
76#include <uapi/linux/limits.h>
77
78#include "audit.h"
79
80/* flags stating the success for a syscall */
81#define AUDITSC_INVALID 0
82#define AUDITSC_SUCCESS 1
83#define AUDITSC_FAILURE 2
84
85/* no execve audit message should be longer than this (userspace limits) */
86#define MAX_EXECVE_AUDIT_LEN 7500
87
88/* max length to print of cmdline/proctitle value during audit */
89#define MAX_PROCTITLE_AUDIT_LEN 128
90
91/* number of audit rules */
92int audit_n_rules;
93
94/* determines whether we collect data for signals sent */
95int audit_signals;
96
97struct audit_aux_data {
98 struct audit_aux_data *next;
99 int type;
100};
101
102#define AUDIT_AUX_IPCPERM 0
103
104/* Number of target pids per aux struct. */
105#define AUDIT_AUX_PIDS 16
106
107struct audit_aux_data_pids {
108 struct audit_aux_data d;
109 pid_t target_pid[AUDIT_AUX_PIDS];
110 kuid_t target_auid[AUDIT_AUX_PIDS];
111 kuid_t target_uid[AUDIT_AUX_PIDS];
112 unsigned int target_sessionid[AUDIT_AUX_PIDS];
113 u32 target_sid[AUDIT_AUX_PIDS];
114 char target_comm[AUDIT_AUX_PIDS][TASK_COMM_LEN];
115 int pid_count;
116};
117
118struct audit_aux_data_bprm_fcaps {
119 struct audit_aux_data d;
120 struct audit_cap_data fcap;
121 unsigned int fcap_ver;
122 struct audit_cap_data old_pcap;
123 struct audit_cap_data new_pcap;
124};
125
126struct audit_tree_refs {
127 struct audit_tree_refs *next;
128 struct audit_chunk *c[31];
129};
130
131static int audit_match_perm(struct audit_context *ctx, int mask)
132{
133 unsigned n;
134 if (unlikely(!ctx))
135 return 0;
136 n = ctx->major;
137
138 switch (audit_classify_syscall(ctx->arch, n)) {
139 case 0: /* native */
140 if ((mask & AUDIT_PERM_WRITE) &&
141 audit_match_class(AUDIT_CLASS_WRITE, n))
142 return 1;
143 if ((mask & AUDIT_PERM_READ) &&
144 audit_match_class(AUDIT_CLASS_READ, n))
145 return 1;
146 if ((mask & AUDIT_PERM_ATTR) &&
147 audit_match_class(AUDIT_CLASS_CHATTR, n))
148 return 1;
149 return 0;
150 case 1: /* 32bit on biarch */
151 if ((mask & AUDIT_PERM_WRITE) &&
152 audit_match_class(AUDIT_CLASS_WRITE_32, n))
153 return 1;
154 if ((mask & AUDIT_PERM_READ) &&
155 audit_match_class(AUDIT_CLASS_READ_32, n))
156 return 1;
157 if ((mask & AUDIT_PERM_ATTR) &&
158 audit_match_class(AUDIT_CLASS_CHATTR_32, n))
159 return 1;
160 return 0;
161 case 2: /* open */
162 return mask & ACC_MODE(ctx->argv[1]);
163 case 3: /* openat */
164 return mask & ACC_MODE(ctx->argv[2]);
165 case 4: /* socketcall */
166 return ((mask & AUDIT_PERM_WRITE) && ctx->argv[0] == SYS_BIND);
167 case 5: /* execve */
168 return mask & AUDIT_PERM_EXEC;
169 default:
170 return 0;
171 }
172}
173
174static int audit_match_filetype(struct audit_context *ctx, int val)
175{
176 struct audit_names *n;
177 umode_t mode = (umode_t)val;
178
179 if (unlikely(!ctx))
180 return 0;
181
182 list_for_each_entry(n, &ctx->names_list, list) {
183 if ((n->ino != AUDIT_INO_UNSET) &&
184 ((n->mode & S_IFMT) == mode))
185 return 1;
186 }
187
188 return 0;
189}
190
191/*
192 * We keep a linked list of fixed-sized (31 pointer) arrays of audit_chunk *;
193 * ->first_trees points to its beginning, ->trees - to the current end of data.
194 * ->tree_count is the number of free entries in array pointed to by ->trees.
195 * Original condition is (NULL, NULL, 0); as soon as it grows we never revert to NULL,
196 * "empty" becomes (p, p, 31) afterwards. We don't shrink the list (and seriously,
197 * it's going to remain 1-element for almost any setup) until we free context itself.
198 * References in it _are_ dropped - at the same time we free/drop aux stuff.
199 */
200
201#ifdef CONFIG_AUDIT_TREE
202static void audit_set_auditable(struct audit_context *ctx)
203{
204 if (!ctx->prio) {
205 ctx->prio = 1;
206 ctx->current_state = AUDIT_RECORD_CONTEXT;
207 }
208}
209
210static int put_tree_ref(struct audit_context *ctx, struct audit_chunk *chunk)
211{
212 struct audit_tree_refs *p = ctx->trees;
213 int left = ctx->tree_count;
214 if (likely(left)) {
215 p->c[--left] = chunk;
216 ctx->tree_count = left;
217 return 1;
218 }
219 if (!p)
220 return 0;
221 p = p->next;
222 if (p) {
223 p->c[30] = chunk;
224 ctx->trees = p;
225 ctx->tree_count = 30;
226 return 1;
227 }
228 return 0;
229}
230
231static int grow_tree_refs(struct audit_context *ctx)
232{
233 struct audit_tree_refs *p = ctx->trees;
234 ctx->trees = kzalloc(sizeof(struct audit_tree_refs), GFP_KERNEL);
235 if (!ctx->trees) {
236 ctx->trees = p;
237 return 0;
238 }
239 if (p)
240 p->next = ctx->trees;
241 else
242 ctx->first_trees = ctx->trees;
243 ctx->tree_count = 31;
244 return 1;
245}
246#endif
247
248static void unroll_tree_refs(struct audit_context *ctx,
249 struct audit_tree_refs *p, int count)
250{
251#ifdef CONFIG_AUDIT_TREE
252 struct audit_tree_refs *q;
253 int n;
254 if (!p) {
255 /* we started with empty chain */
256 p = ctx->first_trees;
257 count = 31;
258 /* if the very first allocation has failed, nothing to do */
259 if (!p)
260 return;
261 }
262 n = count;
263 for (q = p; q != ctx->trees; q = q->next, n = 31) {
264 while (n--) {
265 audit_put_chunk(q->c[n]);
266 q->c[n] = NULL;
267 }
268 }
269 while (n-- > ctx->tree_count) {
270 audit_put_chunk(q->c[n]);
271 q->c[n] = NULL;
272 }
273 ctx->trees = p;
274 ctx->tree_count = count;
275#endif
276}
277
278static void free_tree_refs(struct audit_context *ctx)
279{
280 struct audit_tree_refs *p, *q;
281 for (p = ctx->first_trees; p; p = q) {
282 q = p->next;
283 kfree(p);
284 }
285}
286
287static int match_tree_refs(struct audit_context *ctx, struct audit_tree *tree)
288{
289#ifdef CONFIG_AUDIT_TREE
290 struct audit_tree_refs *p;
291 int n;
292 if (!tree)
293 return 0;
294 /* full ones */
295 for (p = ctx->first_trees; p != ctx->trees; p = p->next) {
296 for (n = 0; n < 31; n++)
297 if (audit_tree_match(p->c[n], tree))
298 return 1;
299 }
300 /* partial */
301 if (p) {
302 for (n = ctx->tree_count; n < 31; n++)
303 if (audit_tree_match(p->c[n], tree))
304 return 1;
305 }
306#endif
307 return 0;
308}
309
310static int audit_compare_uid(kuid_t uid,
311 struct audit_names *name,
312 struct audit_field *f,
313 struct audit_context *ctx)
314{
315 struct audit_names *n;
316 int rc;
317
318 if (name) {
319 rc = audit_uid_comparator(uid, f->op, name->uid);
320 if (rc)
321 return rc;
322 }
323
324 if (ctx) {
325 list_for_each_entry(n, &ctx->names_list, list) {
326 rc = audit_uid_comparator(uid, f->op, n->uid);
327 if (rc)
328 return rc;
329 }
330 }
331 return 0;
332}
333
334static int audit_compare_gid(kgid_t gid,
335 struct audit_names *name,
336 struct audit_field *f,
337 struct audit_context *ctx)
338{
339 struct audit_names *n;
340 int rc;
341
342 if (name) {
343 rc = audit_gid_comparator(gid, f->op, name->gid);
344 if (rc)
345 return rc;
346 }
347
348 if (ctx) {
349 list_for_each_entry(n, &ctx->names_list, list) {
350 rc = audit_gid_comparator(gid, f->op, n->gid);
351 if (rc)
352 return rc;
353 }
354 }
355 return 0;
356}
357
358static int audit_field_compare(struct task_struct *tsk,
359 const struct cred *cred,
360 struct audit_field *f,
361 struct audit_context *ctx,
362 struct audit_names *name)
363{
364 switch (f->val) {
365 /* process to file object comparisons */
366 case AUDIT_COMPARE_UID_TO_OBJ_UID:
367 return audit_compare_uid(cred->uid, name, f, ctx);
368 case AUDIT_COMPARE_GID_TO_OBJ_GID:
369 return audit_compare_gid(cred->gid, name, f, ctx);
370 case AUDIT_COMPARE_EUID_TO_OBJ_UID:
371 return audit_compare_uid(cred->euid, name, f, ctx);
372 case AUDIT_COMPARE_EGID_TO_OBJ_GID:
373 return audit_compare_gid(cred->egid, name, f, ctx);
374 case AUDIT_COMPARE_AUID_TO_OBJ_UID:
375 return audit_compare_uid(tsk->loginuid, name, f, ctx);
376 case AUDIT_COMPARE_SUID_TO_OBJ_UID:
377 return audit_compare_uid(cred->suid, name, f, ctx);
378 case AUDIT_COMPARE_SGID_TO_OBJ_GID:
379 return audit_compare_gid(cred->sgid, name, f, ctx);
380 case AUDIT_COMPARE_FSUID_TO_OBJ_UID:
381 return audit_compare_uid(cred->fsuid, name, f, ctx);
382 case AUDIT_COMPARE_FSGID_TO_OBJ_GID:
383 return audit_compare_gid(cred->fsgid, name, f, ctx);
384 /* uid comparisons */
385 case AUDIT_COMPARE_UID_TO_AUID:
386 return audit_uid_comparator(cred->uid, f->op, tsk->loginuid);
387 case AUDIT_COMPARE_UID_TO_EUID:
388 return audit_uid_comparator(cred->uid, f->op, cred->euid);
389 case AUDIT_COMPARE_UID_TO_SUID:
390 return audit_uid_comparator(cred->uid, f->op, cred->suid);
391 case AUDIT_COMPARE_UID_TO_FSUID:
392 return audit_uid_comparator(cred->uid, f->op, cred->fsuid);
393 /* auid comparisons */
394 case AUDIT_COMPARE_AUID_TO_EUID:
395 return audit_uid_comparator(tsk->loginuid, f->op, cred->euid);
396 case AUDIT_COMPARE_AUID_TO_SUID:
397 return audit_uid_comparator(tsk->loginuid, f->op, cred->suid);
398 case AUDIT_COMPARE_AUID_TO_FSUID:
399 return audit_uid_comparator(tsk->loginuid, f->op, cred->fsuid);
400 /* euid comparisons */
401 case AUDIT_COMPARE_EUID_TO_SUID:
402 return audit_uid_comparator(cred->euid, f->op, cred->suid);
403 case AUDIT_COMPARE_EUID_TO_FSUID:
404 return audit_uid_comparator(cred->euid, f->op, cred->fsuid);
405 /* suid comparisons */
406 case AUDIT_COMPARE_SUID_TO_FSUID:
407 return audit_uid_comparator(cred->suid, f->op, cred->fsuid);
408 /* gid comparisons */
409 case AUDIT_COMPARE_GID_TO_EGID:
410 return audit_gid_comparator(cred->gid, f->op, cred->egid);
411 case AUDIT_COMPARE_GID_TO_SGID:
412 return audit_gid_comparator(cred->gid, f->op, cred->sgid);
413 case AUDIT_COMPARE_GID_TO_FSGID:
414 return audit_gid_comparator(cred->gid, f->op, cred->fsgid);
415 /* egid comparisons */
416 case AUDIT_COMPARE_EGID_TO_SGID:
417 return audit_gid_comparator(cred->egid, f->op, cred->sgid);
418 case AUDIT_COMPARE_EGID_TO_FSGID:
419 return audit_gid_comparator(cred->egid, f->op, cred->fsgid);
420 /* sgid comparison */
421 case AUDIT_COMPARE_SGID_TO_FSGID:
422 return audit_gid_comparator(cred->sgid, f->op, cred->fsgid);
423 default:
424 WARN(1, "Missing AUDIT_COMPARE define. Report as a bug\n");
425 return 0;
426 }
427 return 0;
428}
429
430/* Determine if any context name data matches a rule's watch data */
431/* Compare a task_struct with an audit_rule. Return 1 on match, 0
432 * otherwise.
433 *
434 * If task_creation is true, this is an explicit indication that we are
435 * filtering a task rule at task creation time. This and tsk == current are
436 * the only situations where tsk->cred may be accessed without an rcu read lock.
437 */
438static int audit_filter_rules(struct task_struct *tsk,
439 struct audit_krule *rule,
440 struct audit_context *ctx,
441 struct audit_names *name,
442 enum audit_state *state,
443 bool task_creation)
444{
445 const struct cred *cred;
446 int i, need_sid = 1;
447 u32 sid;
448
449 cred = rcu_dereference_check(tsk->cred, tsk == current || task_creation);
450
451 for (i = 0; i < rule->field_count; i++) {
452 struct audit_field *f = &rule->fields[i];
453 struct audit_names *n;
454 int result = 0;
455 pid_t pid;
456
457 switch (f->type) {
458 case AUDIT_PID:
459 pid = task_pid_nr(tsk);
460 result = audit_comparator(pid, f->op, f->val);
461 break;
462 case AUDIT_PPID:
463 if (ctx) {
464 if (!ctx->ppid)
465 ctx->ppid = task_ppid_nr(tsk);
466 result = audit_comparator(ctx->ppid, f->op, f->val);
467 }
468 break;
469 case AUDIT_EXE:
470 result = audit_exe_compare(tsk, rule->exe);
471 break;
472 case AUDIT_UID:
473 result = audit_uid_comparator(cred->uid, f->op, f->uid);
474 break;
475 case AUDIT_EUID:
476 result = audit_uid_comparator(cred->euid, f->op, f->uid);
477 break;
478 case AUDIT_SUID:
479 result = audit_uid_comparator(cred->suid, f->op, f->uid);
480 break;
481 case AUDIT_FSUID:
482 result = audit_uid_comparator(cred->fsuid, f->op, f->uid);
483 break;
484 case AUDIT_GID:
485 result = audit_gid_comparator(cred->gid, f->op, f->gid);
486 if (f->op == Audit_equal) {
487 if (!result)
488 result = in_group_p(f->gid);
489 } else if (f->op == Audit_not_equal) {
490 if (result)
491 result = !in_group_p(f->gid);
492 }
493 break;
494 case AUDIT_EGID:
495 result = audit_gid_comparator(cred->egid, f->op, f->gid);
496 if (f->op == Audit_equal) {
497 if (!result)
498 result = in_egroup_p(f->gid);
499 } else if (f->op == Audit_not_equal) {
500 if (result)
501 result = !in_egroup_p(f->gid);
502 }
503 break;
504 case AUDIT_SGID:
505 result = audit_gid_comparator(cred->sgid, f->op, f->gid);
506 break;
507 case AUDIT_FSGID:
508 result = audit_gid_comparator(cred->fsgid, f->op, f->gid);
509 break;
510 case AUDIT_PERS:
511 result = audit_comparator(tsk->personality, f->op, f->val);
512 break;
513 case AUDIT_ARCH:
514 if (ctx)
515 result = audit_comparator(ctx->arch, f->op, f->val);
516 break;
517
518 case AUDIT_EXIT:
519 if (ctx && ctx->return_valid)
520 result = audit_comparator(ctx->return_code, f->op, f->val);
521 break;
522 case AUDIT_SUCCESS:
523 if (ctx && ctx->return_valid) {
524 if (f->val)
525 result = audit_comparator(ctx->return_valid, f->op, AUDITSC_SUCCESS);
526 else
527 result = audit_comparator(ctx->return_valid, f->op, AUDITSC_FAILURE);
528 }
529 break;
530 case AUDIT_DEVMAJOR:
531 if (name) {
532 if (audit_comparator(MAJOR(name->dev), f->op, f->val) ||
533 audit_comparator(MAJOR(name->rdev), f->op, f->val))
534 ++result;
535 } else if (ctx) {
536 list_for_each_entry(n, &ctx->names_list, list) {
537 if (audit_comparator(MAJOR(n->dev), f->op, f->val) ||
538 audit_comparator(MAJOR(n->rdev), f->op, f->val)) {
539 ++result;
540 break;
541 }
542 }
543 }
544 break;
545 case AUDIT_DEVMINOR:
546 if (name) {
547 if (audit_comparator(MINOR(name->dev), f->op, f->val) ||
548 audit_comparator(MINOR(name->rdev), f->op, f->val))
549 ++result;
550 } else if (ctx) {
551 list_for_each_entry(n, &ctx->names_list, list) {
552 if (audit_comparator(MINOR(n->dev), f->op, f->val) ||
553 audit_comparator(MINOR(n->rdev), f->op, f->val)) {
554 ++result;
555 break;
556 }
557 }
558 }
559 break;
560 case AUDIT_INODE:
561 if (name)
562 result = audit_comparator(name->ino, f->op, f->val);
563 else if (ctx) {
564 list_for_each_entry(n, &ctx->names_list, list) {
565 if (audit_comparator(n->ino, f->op, f->val)) {
566 ++result;
567 break;
568 }
569 }
570 }
571 break;
572 case AUDIT_OBJ_UID:
573 if (name) {
574 result = audit_uid_comparator(name->uid, f->op, f->uid);
575 } else if (ctx) {
576 list_for_each_entry(n, &ctx->names_list, list) {
577 if (audit_uid_comparator(n->uid, f->op, f->uid)) {
578 ++result;
579 break;
580 }
581 }
582 }
583 break;
584 case AUDIT_OBJ_GID:
585 if (name) {
586 result = audit_gid_comparator(name->gid, f->op, f->gid);
587 } else if (ctx) {
588 list_for_each_entry(n, &ctx->names_list, list) {
589 if (audit_gid_comparator(n->gid, f->op, f->gid)) {
590 ++result;
591 break;
592 }
593 }
594 }
595 break;
596 case AUDIT_WATCH:
597 if (name)
598 result = audit_watch_compare(rule->watch, name->ino, name->dev);
599 break;
600 case AUDIT_DIR:
601 if (ctx)
602 result = match_tree_refs(ctx, rule->tree);
603 break;
604 case AUDIT_LOGINUID:
605 result = audit_uid_comparator(tsk->loginuid, f->op, f->uid);
606 break;
607 case AUDIT_LOGINUID_SET:
608 result = audit_comparator(audit_loginuid_set(tsk), f->op, f->val);
609 break;
610 case AUDIT_SUBJ_USER:
611 case AUDIT_SUBJ_ROLE:
612 case AUDIT_SUBJ_TYPE:
613 case AUDIT_SUBJ_SEN:
614 case AUDIT_SUBJ_CLR:
615 /* NOTE: this may return negative values indicating
616 a temporary error. We simply treat this as a
617 match for now to avoid losing information that
618 may be wanted. An error message will also be
619 logged upon error */
620 if (f->lsm_rule) {
621 if (need_sid) {
622 security_task_getsecid(tsk, &sid);
623 need_sid = 0;
624 }
625 result = security_audit_rule_match(sid, f->type,
626 f->op,
627 f->lsm_rule,
628 ctx);
629 }
630 break;
631 case AUDIT_OBJ_USER:
632 case AUDIT_OBJ_ROLE:
633 case AUDIT_OBJ_TYPE:
634 case AUDIT_OBJ_LEV_LOW:
635 case AUDIT_OBJ_LEV_HIGH:
636 /* The above note for AUDIT_SUBJ_USER...AUDIT_SUBJ_CLR
637 also applies here */
638 if (f->lsm_rule) {
639 /* Find files that match */
640 if (name) {
641 result = security_audit_rule_match(
642 name->osid, f->type, f->op,
643 f->lsm_rule, ctx);
644 } else if (ctx) {
645 list_for_each_entry(n, &ctx->names_list, list) {
646 if (security_audit_rule_match(n->osid, f->type,
647 f->op, f->lsm_rule,
648 ctx)) {
649 ++result;
650 break;
651 }
652 }
653 }
654 /* Find ipc objects that match */
655 if (!ctx || ctx->type != AUDIT_IPC)
656 break;
657 if (security_audit_rule_match(ctx->ipc.osid,
658 f->type, f->op,
659 f->lsm_rule, ctx))
660 ++result;
661 }
662 break;
663 case AUDIT_ARG0:
664 case AUDIT_ARG1:
665 case AUDIT_ARG2:
666 case AUDIT_ARG3:
667 if (ctx)
668 result = audit_comparator(ctx->argv[f->type-AUDIT_ARG0], f->op, f->val);
669 break;
670 case AUDIT_FILTERKEY:
671 /* ignore this field for filtering */
672 result = 1;
673 break;
674 case AUDIT_PERM:
675 result = audit_match_perm(ctx, f->val);
676 break;
677 case AUDIT_FILETYPE:
678 result = audit_match_filetype(ctx, f->val);
679 break;
680 case AUDIT_FIELD_COMPARE:
681 result = audit_field_compare(tsk, cred, f, ctx, name);
682 break;
683 }
684 if (!result)
685 return 0;
686 }
687
688 if (ctx) {
689 if (rule->prio <= ctx->prio)
690 return 0;
691 if (rule->filterkey) {
692 kfree(ctx->filterkey);
693 ctx->filterkey = kstrdup(rule->filterkey, GFP_ATOMIC);
694 }
695 ctx->prio = rule->prio;
696 }
697 switch (rule->action) {
698 case AUDIT_NEVER: *state = AUDIT_DISABLED; break;
699 case AUDIT_ALWAYS: *state = AUDIT_RECORD_CONTEXT; break;
700 }
701 return 1;
702}
703
704/* At process creation time, we can determine if system-call auditing is
705 * completely disabled for this task. Since we only have the task
706 * structure at this point, we can only check uid and gid.
707 */
708static enum audit_state audit_filter_task(struct task_struct *tsk, char **key)
709{
710 struct audit_entry *e;
711 enum audit_state state;
712
713 rcu_read_lock();
714 list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_TASK], list) {
715 if (audit_filter_rules(tsk, &e->rule, NULL, NULL,
716 &state, true)) {
717 if (state == AUDIT_RECORD_CONTEXT)
718 *key = kstrdup(e->rule.filterkey, GFP_ATOMIC);
719 rcu_read_unlock();
720 return state;
721 }
722 }
723 rcu_read_unlock();
724 return AUDIT_BUILD_CONTEXT;
725}
726
727static int audit_in_mask(const struct audit_krule *rule, unsigned long val)
728{
729 int word, bit;
730
731 if (val > 0xffffffff)
732 return false;
733
734 word = AUDIT_WORD(val);
735 if (word >= AUDIT_BITMASK_SIZE)
736 return false;
737
738 bit = AUDIT_BIT(val);
739
740 return rule->mask[word] & bit;
741}
742
743/* At syscall entry and exit time, this filter is called if the
744 * audit_state is not low enough that auditing cannot take place, but is
745 * also not high enough that we already know we have to write an audit
746 * record (i.e., the state is AUDIT_SETUP_CONTEXT or AUDIT_BUILD_CONTEXT).
747 */
748static enum audit_state audit_filter_syscall(struct task_struct *tsk,
749 struct audit_context *ctx,
750 struct list_head *list)
751{
752 struct audit_entry *e;
753 enum audit_state state;
754
755 if (audit_pid && tsk->tgid == audit_pid)
756 return AUDIT_DISABLED;
757
758 rcu_read_lock();
759 if (!list_empty(list)) {
760 list_for_each_entry_rcu(e, list, list) {
761 if (audit_in_mask(&e->rule, ctx->major) &&
762 audit_filter_rules(tsk, &e->rule, ctx, NULL,
763 &state, false)) {
764 rcu_read_unlock();
765 ctx->current_state = state;
766 return state;
767 }
768 }
769 }
770 rcu_read_unlock();
771 return AUDIT_BUILD_CONTEXT;
772}
773
774/*
775 * Given an audit_name check the inode hash table to see if they match.
776 * Called holding the rcu read lock to protect the use of audit_inode_hash
777 */
778static int audit_filter_inode_name(struct task_struct *tsk,
779 struct audit_names *n,
780 struct audit_context *ctx) {
781 int h = audit_hash_ino((u32)n->ino);
782 struct list_head *list = &audit_inode_hash[h];
783 struct audit_entry *e;
784 enum audit_state state;
785
786 if (list_empty(list))
787 return 0;
788
789 list_for_each_entry_rcu(e, list, list) {
790 if (audit_in_mask(&e->rule, ctx->major) &&
791 audit_filter_rules(tsk, &e->rule, ctx, n, &state, false)) {
792 ctx->current_state = state;
793 return 1;
794 }
795 }
796
797 return 0;
798}
799
800/* At syscall exit time, this filter is called if any audit_names have been
801 * collected during syscall processing. We only check rules in sublists at hash
802 * buckets applicable to the inode numbers in audit_names.
803 * Regarding audit_state, same rules apply as for audit_filter_syscall().
804 */
805void audit_filter_inodes(struct task_struct *tsk, struct audit_context *ctx)
806{
807 struct audit_names *n;
808
809 if (audit_pid && tsk->tgid == audit_pid)
810 return;
811
812 rcu_read_lock();
813
814 list_for_each_entry(n, &ctx->names_list, list) {
815 if (audit_filter_inode_name(tsk, n, ctx))
816 break;
817 }
818 rcu_read_unlock();
819}
820
821/* Transfer the audit context pointer to the caller, clearing it in the tsk's struct */
822static inline struct audit_context *audit_take_context(struct task_struct *tsk,
823 int return_valid,
824 long return_code)
825{
826 struct audit_context *context = tsk->audit_context;
827
828 if (!context)
829 return NULL;
830 context->return_valid = return_valid;
831
832 /*
833 * we need to fix up the return code in the audit logs if the actual
834 * return codes are later going to be fixed up by the arch specific
835 * signal handlers
836 *
837 * This is actually a test for:
838 * (rc == ERESTARTSYS ) || (rc == ERESTARTNOINTR) ||
839 * (rc == ERESTARTNOHAND) || (rc == ERESTART_RESTARTBLOCK)
840 *
841 * but is faster than a bunch of ||
842 */
843 if (unlikely(return_code <= -ERESTARTSYS) &&
844 (return_code >= -ERESTART_RESTARTBLOCK) &&
845 (return_code != -ENOIOCTLCMD))
846 context->return_code = -EINTR;
847 else
848 context->return_code = return_code;
849
850 if (context->in_syscall && !context->dummy) {
851 audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_EXIT]);
852 audit_filter_inodes(tsk, context);
853 }
854
855 tsk->audit_context = NULL;
856 return context;
857}
858
859static inline void audit_proctitle_free(struct audit_context *context)
860{
861 kfree(context->proctitle.value);
862 context->proctitle.value = NULL;
863 context->proctitle.len = 0;
864}
865
866static inline void audit_free_names(struct audit_context *context)
867{
868 struct audit_names *n, *next;
869
870 list_for_each_entry_safe(n, next, &context->names_list, list) {
871 list_del(&n->list);
872 if (n->name)
873 putname(n->name);
874 if (n->should_free)
875 kfree(n);
876 }
877 context->name_count = 0;
878 path_put(&context->pwd);
879 context->pwd.dentry = NULL;
880 context->pwd.mnt = NULL;
881}
882
883static inline void audit_free_aux(struct audit_context *context)
884{
885 struct audit_aux_data *aux;
886
887 while ((aux = context->aux)) {
888 context->aux = aux->next;
889 kfree(aux);
890 }
891 while ((aux = context->aux_pids)) {
892 context->aux_pids = aux->next;
893 kfree(aux);
894 }
895}
896
897static inline struct audit_context *audit_alloc_context(enum audit_state state)
898{
899 struct audit_context *context;
900
901 context = kzalloc(sizeof(*context), GFP_KERNEL);
902 if (!context)
903 return NULL;
904 context->state = state;
905 context->prio = state == AUDIT_RECORD_CONTEXT ? ~0ULL : 0;
906 INIT_LIST_HEAD(&context->killed_trees);
907 INIT_LIST_HEAD(&context->names_list);
908 return context;
909}
910
911/**
912 * audit_alloc - allocate an audit context block for a task
913 * @tsk: task
914 *
915 * Filter on the task information and allocate a per-task audit context
916 * if necessary. Doing so turns on system call auditing for the
917 * specified task. This is called from copy_process, so no lock is
918 * needed.
919 */
920int audit_alloc(struct task_struct *tsk)
921{
922 struct audit_context *context;
923 enum audit_state state;
924 char *key = NULL;
925
926 if (likely(!audit_ever_enabled))
927 return 0; /* Return if not auditing. */
928
929 state = audit_filter_task(tsk, &key);
930 if (state == AUDIT_DISABLED) {
931 clear_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT);
932 return 0;
933 }
934
935 if (!(context = audit_alloc_context(state))) {
936 kfree(key);
937 audit_log_lost("out of memory in audit_alloc");
938 return -ENOMEM;
939 }
940 context->filterkey = key;
941
942 tsk->audit_context = context;
943 set_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT);
944 return 0;
945}
946
947static inline void audit_free_context(struct audit_context *context)
948{
949 audit_free_names(context);
950 unroll_tree_refs(context, NULL, 0);
951 free_tree_refs(context);
952 audit_free_aux(context);
953 kfree(context->filterkey);
954 kfree(context->sockaddr);
955 audit_proctitle_free(context);
956 kfree(context);
957}
958
959static int audit_log_pid_context(struct audit_context *context, pid_t pid,
960 kuid_t auid, kuid_t uid, unsigned int sessionid,
961 u32 sid, char *comm)
962{
963 struct audit_buffer *ab;
964 char *ctx = NULL;
965 u32 len;
966 int rc = 0;
967
968 ab = audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID);
969 if (!ab)
970 return rc;
971
972 audit_log_format(ab, "opid=%d oauid=%d ouid=%d oses=%d", pid,
973 from_kuid(&init_user_ns, auid),
974 from_kuid(&init_user_ns, uid), sessionid);
975 if (sid) {
976 if (security_secid_to_secctx(sid, &ctx, &len)) {
977 audit_log_format(ab, " obj=(none)");
978 rc = 1;
979 } else {
980 audit_log_format(ab, " obj=%s", ctx);
981 security_release_secctx(ctx, len);
982 }
983 }
984 audit_log_format(ab, " ocomm=");
985 audit_log_untrustedstring(ab, comm);
986 audit_log_end(ab);
987
988 return rc;
989}
990
991/*
992 * to_send and len_sent accounting are very loose estimates. We aren't
993 * really worried about a hard cap to MAX_EXECVE_AUDIT_LEN so much as being
994 * within about 500 bytes (next page boundary)
995 *
996 * why snprintf? an int is up to 12 digits long. if we just assumed when
997 * logging that a[%d]= was going to be 16 characters long we would be wasting
998 * space in every audit message. In one 7500 byte message we can log up to
999 * about 1000 min size arguments. That comes down to about 50% waste of space
1000 * if we didn't do the snprintf to find out how long arg_num_len was.
1001 */
1002static int audit_log_single_execve_arg(struct audit_context *context,
1003 struct audit_buffer **ab,
1004 int arg_num,
1005 size_t *len_sent,
1006 const char __user *p,
1007 char *buf)
1008{
1009 char arg_num_len_buf[12];
1010 const char __user *tmp_p = p;
1011 /* how many digits are in arg_num? 5 is the length of ' a=""' */
1012 size_t arg_num_len = snprintf(arg_num_len_buf, 12, "%d", arg_num) + 5;
1013 size_t len, len_left, to_send;
1014 size_t max_execve_audit_len = MAX_EXECVE_AUDIT_LEN;
1015 unsigned int i, has_cntl = 0, too_long = 0;
1016 int ret;
1017
1018 /* strnlen_user includes the null we don't want to send */
1019 len_left = len = strnlen_user(p, MAX_ARG_STRLEN) - 1;
1020
1021 /*
1022 * We just created this mm, if we can't find the strings
1023 * we just copied into it something is _very_ wrong. Similar
1024 * for strings that are too long, we should not have created
1025 * any.
1026 */
1027 if (WARN_ON_ONCE(len < 0 || len > MAX_ARG_STRLEN - 1)) {
1028 send_sig(SIGKILL, current, 0);
1029 return -1;
1030 }
1031
1032 /* walk the whole argument looking for non-ascii chars */
1033 do {
1034 if (len_left > MAX_EXECVE_AUDIT_LEN)
1035 to_send = MAX_EXECVE_AUDIT_LEN;
1036 else
1037 to_send = len_left;
1038 ret = copy_from_user(buf, tmp_p, to_send);
1039 /*
1040 * There is no reason for this copy to be short. We just
1041 * copied them here, and the mm hasn't been exposed to user-
1042 * space yet.
1043 */
1044 if (ret) {
1045 WARN_ON(1);
1046 send_sig(SIGKILL, current, 0);
1047 return -1;
1048 }
1049 buf[to_send] = '\0';
1050 has_cntl = audit_string_contains_control(buf, to_send);
1051 if (has_cntl) {
1052 /*
1053 * hex messages get logged as 2 bytes, so we can only
1054 * send half as much in each message
1055 */
1056 max_execve_audit_len = MAX_EXECVE_AUDIT_LEN / 2;
1057 break;
1058 }
1059 len_left -= to_send;
1060 tmp_p += to_send;
1061 } while (len_left > 0);
1062
1063 len_left = len;
1064
1065 if (len > max_execve_audit_len)
1066 too_long = 1;
1067
1068 /* rewalk the argument actually logging the message */
1069 for (i = 0; len_left > 0; i++) {
1070 int room_left;
1071
1072 if (len_left > max_execve_audit_len)
1073 to_send = max_execve_audit_len;
1074 else
1075 to_send = len_left;
1076
1077 /* do we have space left to send this argument in this ab? */
1078 room_left = MAX_EXECVE_AUDIT_LEN - arg_num_len - *len_sent;
1079 if (has_cntl)
1080 room_left -= (to_send * 2);
1081 else
1082 room_left -= to_send;
1083 if (room_left < 0) {
1084 *len_sent = 0;
1085 audit_log_end(*ab);
1086 *ab = audit_log_start(context, GFP_KERNEL, AUDIT_EXECVE);
1087 if (!*ab)
1088 return 0;
1089 }
1090
1091 /*
1092 * first record needs to say how long the original string was
1093 * so we can be sure nothing was lost.
1094 */
1095 if ((i == 0) && (too_long))
1096 audit_log_format(*ab, " a%d_len=%zu", arg_num,
1097 has_cntl ? 2*len : len);
1098
1099 /*
1100 * normally arguments are small enough to fit and we already
1101 * filled buf above when we checked for control characters
1102 * so don't bother with another copy_from_user
1103 */
1104 if (len >= max_execve_audit_len)
1105 ret = copy_from_user(buf, p, to_send);
1106 else
1107 ret = 0;
1108 if (ret) {
1109 WARN_ON(1);
1110 send_sig(SIGKILL, current, 0);
1111 return -1;
1112 }
1113 buf[to_send] = '\0';
1114
1115 /* actually log it */
1116 audit_log_format(*ab, " a%d", arg_num);
1117 if (too_long)
1118 audit_log_format(*ab, "[%d]", i);
1119 audit_log_format(*ab, "=");
1120 if (has_cntl)
1121 audit_log_n_hex(*ab, buf, to_send);
1122 else
1123 audit_log_string(*ab, buf);
1124
1125 p += to_send;
1126 len_left -= to_send;
1127 *len_sent += arg_num_len;
1128 if (has_cntl)
1129 *len_sent += to_send * 2;
1130 else
1131 *len_sent += to_send;
1132 }
1133 /* include the null we didn't log */
1134 return len + 1;
1135}
1136
1137static void audit_log_execve_info(struct audit_context *context,
1138 struct audit_buffer **ab)
1139{
1140 int i, len;
1141 size_t len_sent = 0;
1142 const char __user *p;
1143 char *buf;
1144
1145 p = (const char __user *)current->mm->arg_start;
1146
1147 audit_log_format(*ab, "argc=%d", context->execve.argc);
1148
1149 /*
1150 * we need some kernel buffer to hold the userspace args. Just
1151 * allocate one big one rather than allocating one of the right size
1152 * for every single argument inside audit_log_single_execve_arg()
1153 * should be <8k allocation so should be pretty safe.
1154 */
1155 buf = kmalloc(MAX_EXECVE_AUDIT_LEN + 1, GFP_KERNEL);
1156 if (!buf) {
1157 audit_panic("out of memory for argv string");
1158 return;
1159 }
1160
1161 for (i = 0; i < context->execve.argc; i++) {
1162 len = audit_log_single_execve_arg(context, ab, i,
1163 &len_sent, p, buf);
1164 if (len <= 0)
1165 break;
1166 p += len;
1167 }
1168 kfree(buf);
1169}
1170
1171static void show_special(struct audit_context *context, int *call_panic)
1172{
1173 struct audit_buffer *ab;
1174 int i;
1175
1176 ab = audit_log_start(context, GFP_KERNEL, context->type);
1177 if (!ab)
1178 return;
1179
1180 switch (context->type) {
1181 case AUDIT_SOCKETCALL: {
1182 int nargs = context->socketcall.nargs;
1183 audit_log_format(ab, "nargs=%d", nargs);
1184 for (i = 0; i < nargs; i++)
1185 audit_log_format(ab, " a%d=%lx", i,
1186 context->socketcall.args[i]);
1187 break; }
1188 case AUDIT_IPC: {
1189 u32 osid = context->ipc.osid;
1190
1191 audit_log_format(ab, "ouid=%u ogid=%u mode=%#ho",
1192 from_kuid(&init_user_ns, context->ipc.uid),
1193 from_kgid(&init_user_ns, context->ipc.gid),
1194 context->ipc.mode);
1195 if (osid) {
1196 char *ctx = NULL;
1197 u32 len;
1198 if (security_secid_to_secctx(osid, &ctx, &len)) {
1199 audit_log_format(ab, " osid=%u", osid);
1200 *call_panic = 1;
1201 } else {
1202 audit_log_format(ab, " obj=%s", ctx);
1203 security_release_secctx(ctx, len);
1204 }
1205 }
1206 if (context->ipc.has_perm) {
1207 audit_log_end(ab);
1208 ab = audit_log_start(context, GFP_KERNEL,
1209 AUDIT_IPC_SET_PERM);
1210 if (unlikely(!ab))
1211 return;
1212 audit_log_format(ab,
1213 "qbytes=%lx ouid=%u ogid=%u mode=%#ho",
1214 context->ipc.qbytes,
1215 context->ipc.perm_uid,
1216 context->ipc.perm_gid,
1217 context->ipc.perm_mode);
1218 }
1219 break; }
1220 case AUDIT_MQ_OPEN: {
1221 audit_log_format(ab,
1222 "oflag=0x%x mode=%#ho mq_flags=0x%lx mq_maxmsg=%ld "
1223 "mq_msgsize=%ld mq_curmsgs=%ld",
1224 context->mq_open.oflag, context->mq_open.mode,
1225 context->mq_open.attr.mq_flags,
1226 context->mq_open.attr.mq_maxmsg,
1227 context->mq_open.attr.mq_msgsize,
1228 context->mq_open.attr.mq_curmsgs);
1229 break; }
1230 case AUDIT_MQ_SENDRECV: {
1231 audit_log_format(ab,
1232 "mqdes=%d msg_len=%zd msg_prio=%u "
1233 "abs_timeout_sec=%ld abs_timeout_nsec=%ld",
1234 context->mq_sendrecv.mqdes,
1235 context->mq_sendrecv.msg_len,
1236 context->mq_sendrecv.msg_prio,
1237 context->mq_sendrecv.abs_timeout.tv_sec,
1238 context->mq_sendrecv.abs_timeout.tv_nsec);
1239 break; }
1240 case AUDIT_MQ_NOTIFY: {
1241 audit_log_format(ab, "mqdes=%d sigev_signo=%d",
1242 context->mq_notify.mqdes,
1243 context->mq_notify.sigev_signo);
1244 break; }
1245 case AUDIT_MQ_GETSETATTR: {
1246 struct mq_attr *attr = &context->mq_getsetattr.mqstat;
1247 audit_log_format(ab,
1248 "mqdes=%d mq_flags=0x%lx mq_maxmsg=%ld mq_msgsize=%ld "
1249 "mq_curmsgs=%ld ",
1250 context->mq_getsetattr.mqdes,
1251 attr->mq_flags, attr->mq_maxmsg,
1252 attr->mq_msgsize, attr->mq_curmsgs);
1253 break; }
1254 case AUDIT_CAPSET: {
1255 audit_log_format(ab, "pid=%d", context->capset.pid);
1256 audit_log_cap(ab, "cap_pi", &context->capset.cap.inheritable);
1257 audit_log_cap(ab, "cap_pp", &context->capset.cap.permitted);
1258 audit_log_cap(ab, "cap_pe", &context->capset.cap.effective);
1259 break; }
1260 case AUDIT_MMAP: {
1261 audit_log_format(ab, "fd=%d flags=0x%x", context->mmap.fd,
1262 context->mmap.flags);
1263 break; }
1264 case AUDIT_EXECVE: {
1265 audit_log_execve_info(context, &ab);
1266 break; }
1267 }
1268 audit_log_end(ab);
1269}
1270
1271static inline int audit_proctitle_rtrim(char *proctitle, int len)
1272{
1273 char *end = proctitle + len - 1;
1274 while (end > proctitle && !isprint(*end))
1275 end--;
1276
1277 /* catch the case where proctitle is only 1 non-print character */
1278 len = end - proctitle + 1;
1279 len -= isprint(proctitle[len-1]) == 0;
1280 return len;
1281}
1282
1283static void audit_log_proctitle(struct task_struct *tsk,
1284 struct audit_context *context)
1285{
1286 int res;
1287 char *buf;
1288 char *msg = "(null)";
1289 int len = strlen(msg);
1290 struct audit_buffer *ab;
1291
1292 ab = audit_log_start(context, GFP_KERNEL, AUDIT_PROCTITLE);
1293 if (!ab)
1294 return; /* audit_panic or being filtered */
1295
1296 audit_log_format(ab, "proctitle=");
1297
1298 /* Not cached */
1299 if (!context->proctitle.value) {
1300 buf = kmalloc(MAX_PROCTITLE_AUDIT_LEN, GFP_KERNEL);
1301 if (!buf)
1302 goto out;
1303 /* Historically called this from procfs naming */
1304 res = get_cmdline(tsk, buf, MAX_PROCTITLE_AUDIT_LEN);
1305 if (res == 0) {
1306 kfree(buf);
1307 goto out;
1308 }
1309 res = audit_proctitle_rtrim(buf, res);
1310 if (res == 0) {
1311 kfree(buf);
1312 goto out;
1313 }
1314 context->proctitle.value = buf;
1315 context->proctitle.len = res;
1316 }
1317 msg = context->proctitle.value;
1318 len = context->proctitle.len;
1319out:
1320 audit_log_n_untrustedstring(ab, msg, len);
1321 audit_log_end(ab);
1322}
1323
1324static void audit_log_exit(struct audit_context *context, struct task_struct *tsk)
1325{
1326 int i, call_panic = 0;
1327 struct audit_buffer *ab;
1328 struct audit_aux_data *aux;
1329 struct audit_names *n;
1330
1331 /* tsk == current */
1332 context->personality = tsk->personality;
1333
1334 ab = audit_log_start(context, GFP_KERNEL, AUDIT_SYSCALL);
1335 if (!ab)
1336 return; /* audit_panic has been called */
1337 audit_log_format(ab, "arch=%x syscall=%d",
1338 context->arch, context->major);
1339 if (context->personality != PER_LINUX)
1340 audit_log_format(ab, " per=%lx", context->personality);
1341 if (context->return_valid)
1342 audit_log_format(ab, " success=%s exit=%ld",
1343 (context->return_valid==AUDITSC_SUCCESS)?"yes":"no",
1344 context->return_code);
1345
1346 audit_log_format(ab,
1347 " a0=%lx a1=%lx a2=%lx a3=%lx items=%d",
1348 context->argv[0],
1349 context->argv[1],
1350 context->argv[2],
1351 context->argv[3],
1352 context->name_count);
1353
1354 audit_log_task_info(ab, tsk);
1355 audit_log_key(ab, context->filterkey);
1356 audit_log_end(ab);
1357
1358 for (aux = context->aux; aux; aux = aux->next) {
1359
1360 ab = audit_log_start(context, GFP_KERNEL, aux->type);
1361 if (!ab)
1362 continue; /* audit_panic has been called */
1363
1364 switch (aux->type) {
1365
1366 case AUDIT_BPRM_FCAPS: {
1367 struct audit_aux_data_bprm_fcaps *axs = (void *)aux;
1368 audit_log_format(ab, "fver=%x", axs->fcap_ver);
1369 audit_log_cap(ab, "fp", &axs->fcap.permitted);
1370 audit_log_cap(ab, "fi", &axs->fcap.inheritable);
1371 audit_log_format(ab, " fe=%d", axs->fcap.fE);
1372 audit_log_cap(ab, "old_pp", &axs->old_pcap.permitted);
1373 audit_log_cap(ab, "old_pi", &axs->old_pcap.inheritable);
1374 audit_log_cap(ab, "old_pe", &axs->old_pcap.effective);
1375 audit_log_cap(ab, "new_pp", &axs->new_pcap.permitted);
1376 audit_log_cap(ab, "new_pi", &axs->new_pcap.inheritable);
1377 audit_log_cap(ab, "new_pe", &axs->new_pcap.effective);
1378 break; }
1379
1380 }
1381 audit_log_end(ab);
1382 }
1383
1384 if (context->type)
1385 show_special(context, &call_panic);
1386
1387 if (context->fds[0] >= 0) {
1388 ab = audit_log_start(context, GFP_KERNEL, AUDIT_FD_PAIR);
1389 if (ab) {
1390 audit_log_format(ab, "fd0=%d fd1=%d",
1391 context->fds[0], context->fds[1]);
1392 audit_log_end(ab);
1393 }
1394 }
1395
1396 if (context->sockaddr_len) {
1397 ab = audit_log_start(context, GFP_KERNEL, AUDIT_SOCKADDR);
1398 if (ab) {
1399 audit_log_format(ab, "saddr=");
1400 audit_log_n_hex(ab, (void *)context->sockaddr,
1401 context->sockaddr_len);
1402 audit_log_end(ab);
1403 }
1404 }
1405
1406 for (aux = context->aux_pids; aux; aux = aux->next) {
1407 struct audit_aux_data_pids *axs = (void *)aux;
1408
1409 for (i = 0; i < axs->pid_count; i++)
1410 if (audit_log_pid_context(context, axs->target_pid[i],
1411 axs->target_auid[i],
1412 axs->target_uid[i],
1413 axs->target_sessionid[i],
1414 axs->target_sid[i],
1415 axs->target_comm[i]))
1416 call_panic = 1;
1417 }
1418
1419 if (context->target_pid &&
1420 audit_log_pid_context(context, context->target_pid,
1421 context->target_auid, context->target_uid,
1422 context->target_sessionid,
1423 context->target_sid, context->target_comm))
1424 call_panic = 1;
1425
1426 if (context->pwd.dentry && context->pwd.mnt) {
1427 ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD);
1428 if (ab) {
1429 audit_log_d_path(ab, " cwd=", &context->pwd);
1430 audit_log_end(ab);
1431 }
1432 }
1433
1434 i = 0;
1435 list_for_each_entry(n, &context->names_list, list) {
1436 if (n->hidden)
1437 continue;
1438 audit_log_name(context, n, NULL, i++, &call_panic);
1439 }
1440
1441 audit_log_proctitle(tsk, context);
1442
1443 /* Send end of event record to help user space know we are finished */
1444 ab = audit_log_start(context, GFP_KERNEL, AUDIT_EOE);
1445 if (ab)
1446 audit_log_end(ab);
1447 if (call_panic)
1448 audit_panic("error converting sid to string");
1449}
1450
1451/**
1452 * audit_free - free a per-task audit context
1453 * @tsk: task whose audit context block to free
1454 *
1455 * Called from copy_process and do_exit
1456 */
1457void __audit_free(struct task_struct *tsk)
1458{
1459 struct audit_context *context;
1460
1461 context = audit_take_context(tsk, 0, 0);
1462 if (!context)
1463 return;
1464
1465 /* Check for system calls that do not go through the exit
1466 * function (e.g., exit_group), then free context block.
1467 * We use GFP_ATOMIC here because we might be doing this
1468 * in the context of the idle thread */
1469 /* that can happen only if we are called from do_exit() */
1470 if (context->in_syscall && context->current_state == AUDIT_RECORD_CONTEXT)
1471 audit_log_exit(context, tsk);
1472 if (!list_empty(&context->killed_trees))
1473 audit_kill_trees(&context->killed_trees);
1474
1475 audit_free_context(context);
1476}
1477
1478/**
1479 * audit_syscall_entry - fill in an audit record at syscall entry
1480 * @major: major syscall type (function)
1481 * @a1: additional syscall register 1
1482 * @a2: additional syscall register 2
1483 * @a3: additional syscall register 3
1484 * @a4: additional syscall register 4
1485 *
1486 * Fill in audit context at syscall entry. This only happens if the
1487 * audit context was created when the task was created and the state or
1488 * filters demand the audit context be built. If the state from the
1489 * per-task filter or from the per-syscall filter is AUDIT_RECORD_CONTEXT,
1490 * then the record will be written at syscall exit time (otherwise, it
1491 * will only be written if another part of the kernel requests that it
1492 * be written).
1493 */
1494void __audit_syscall_entry(int major, unsigned long a1, unsigned long a2,
1495 unsigned long a3, unsigned long a4)
1496{
1497 struct task_struct *tsk = current;
1498 struct audit_context *context = tsk->audit_context;
1499 enum audit_state state;
1500
1501 if (!context)
1502 return;
1503
1504 BUG_ON(context->in_syscall || context->name_count);
1505
1506 if (!audit_enabled)
1507 return;
1508
1509 context->arch = syscall_get_arch();
1510 context->major = major;
1511 context->argv[0] = a1;
1512 context->argv[1] = a2;
1513 context->argv[2] = a3;
1514 context->argv[3] = a4;
1515
1516 state = context->state;
1517 context->dummy = !audit_n_rules;
1518 if (!context->dummy && state == AUDIT_BUILD_CONTEXT) {
1519 context->prio = 0;
1520 state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_ENTRY]);
1521 }
1522 if (state == AUDIT_DISABLED)
1523 return;
1524
1525 context->serial = 0;
1526 context->ctime = CURRENT_TIME;
1527 context->in_syscall = 1;
1528 context->current_state = state;
1529 context->ppid = 0;
1530}
1531
1532/**
1533 * audit_syscall_exit - deallocate audit context after a system call
1534 * @success: success value of the syscall
1535 * @return_code: return value of the syscall
1536 *
1537 * Tear down after system call. If the audit context has been marked as
1538 * auditable (either because of the AUDIT_RECORD_CONTEXT state from
1539 * filtering, or because some other part of the kernel wrote an audit
1540 * message), then write out the syscall information. In call cases,
1541 * free the names stored from getname().
1542 */
1543void __audit_syscall_exit(int success, long return_code)
1544{
1545 struct task_struct *tsk = current;
1546 struct audit_context *context;
1547
1548 if (success)
1549 success = AUDITSC_SUCCESS;
1550 else
1551 success = AUDITSC_FAILURE;
1552
1553 context = audit_take_context(tsk, success, return_code);
1554 if (!context)
1555 return;
1556
1557 if (context->in_syscall && context->current_state == AUDIT_RECORD_CONTEXT)
1558 audit_log_exit(context, tsk);
1559
1560 context->in_syscall = 0;
1561 context->prio = context->state == AUDIT_RECORD_CONTEXT ? ~0ULL : 0;
1562
1563 if (!list_empty(&context->killed_trees))
1564 audit_kill_trees(&context->killed_trees);
1565
1566 audit_free_names(context);
1567 unroll_tree_refs(context, NULL, 0);
1568 audit_free_aux(context);
1569 context->aux = NULL;
1570 context->aux_pids = NULL;
1571 context->target_pid = 0;
1572 context->target_sid = 0;
1573 context->sockaddr_len = 0;
1574 context->type = 0;
1575 context->fds[0] = -1;
1576 if (context->state != AUDIT_RECORD_CONTEXT) {
1577 kfree(context->filterkey);
1578 context->filterkey = NULL;
1579 }
1580 tsk->audit_context = context;
1581}
1582
1583static inline void handle_one(const struct inode *inode)
1584{
1585#ifdef CONFIG_AUDIT_TREE
1586 struct audit_context *context;
1587 struct audit_tree_refs *p;
1588 struct audit_chunk *chunk;
1589 int count;
1590 if (likely(hlist_empty(&inode->i_fsnotify_marks)))
1591 return;
1592 context = current->audit_context;
1593 p = context->trees;
1594 count = context->tree_count;
1595 rcu_read_lock();
1596 chunk = audit_tree_lookup(inode);
1597 rcu_read_unlock();
1598 if (!chunk)
1599 return;
1600 if (likely(put_tree_ref(context, chunk)))
1601 return;
1602 if (unlikely(!grow_tree_refs(context))) {
1603 pr_warn("out of memory, audit has lost a tree reference\n");
1604 audit_set_auditable(context);
1605 audit_put_chunk(chunk);
1606 unroll_tree_refs(context, p, count);
1607 return;
1608 }
1609 put_tree_ref(context, chunk);
1610#endif
1611}
1612
1613static void handle_path(const struct dentry *dentry)
1614{
1615#ifdef CONFIG_AUDIT_TREE
1616 struct audit_context *context;
1617 struct audit_tree_refs *p;
1618 const struct dentry *d, *parent;
1619 struct audit_chunk *drop;
1620 unsigned long seq;
1621 int count;
1622
1623 context = current->audit_context;
1624 p = context->trees;
1625 count = context->tree_count;
1626retry:
1627 drop = NULL;
1628 d = dentry;
1629 rcu_read_lock();
1630 seq = read_seqbegin(&rename_lock);
1631 for(;;) {
1632 struct inode *inode = d_backing_inode(d);
1633 if (inode && unlikely(!hlist_empty(&inode->i_fsnotify_marks))) {
1634 struct audit_chunk *chunk;
1635 chunk = audit_tree_lookup(inode);
1636 if (chunk) {
1637 if (unlikely(!put_tree_ref(context, chunk))) {
1638 drop = chunk;
1639 break;
1640 }
1641 }
1642 }
1643 parent = d->d_parent;
1644 if (parent == d)
1645 break;
1646 d = parent;
1647 }
1648 if (unlikely(read_seqretry(&rename_lock, seq) || drop)) { /* in this order */
1649 rcu_read_unlock();
1650 if (!drop) {
1651 /* just a race with rename */
1652 unroll_tree_refs(context, p, count);
1653 goto retry;
1654 }
1655 audit_put_chunk(drop);
1656 if (grow_tree_refs(context)) {
1657 /* OK, got more space */
1658 unroll_tree_refs(context, p, count);
1659 goto retry;
1660 }
1661 /* too bad */
1662 pr_warn("out of memory, audit has lost a tree reference\n");
1663 unroll_tree_refs(context, p, count);
1664 audit_set_auditable(context);
1665 return;
1666 }
1667 rcu_read_unlock();
1668#endif
1669}
1670
1671static struct audit_names *audit_alloc_name(struct audit_context *context,
1672 unsigned char type)
1673{
1674 struct audit_names *aname;
1675
1676 if (context->name_count < AUDIT_NAMES) {
1677 aname = &context->preallocated_names[context->name_count];
1678 memset(aname, 0, sizeof(*aname));
1679 } else {
1680 aname = kzalloc(sizeof(*aname), GFP_NOFS);
1681 if (!aname)
1682 return NULL;
1683 aname->should_free = true;
1684 }
1685
1686 aname->ino = AUDIT_INO_UNSET;
1687 aname->type = type;
1688 list_add_tail(&aname->list, &context->names_list);
1689
1690 context->name_count++;
1691 return aname;
1692}
1693
1694/**
1695 * audit_reusename - fill out filename with info from existing entry
1696 * @uptr: userland ptr to pathname
1697 *
1698 * Search the audit_names list for the current audit context. If there is an
1699 * existing entry with a matching "uptr" then return the filename
1700 * associated with that audit_name. If not, return NULL.
1701 */
1702struct filename *
1703__audit_reusename(const __user char *uptr)
1704{
1705 struct audit_context *context = current->audit_context;
1706 struct audit_names *n;
1707
1708 list_for_each_entry(n, &context->names_list, list) {
1709 if (!n->name)
1710 continue;
1711 if (n->name->uptr == uptr) {
1712 n->name->refcnt++;
1713 return n->name;
1714 }
1715 }
1716 return NULL;
1717}
1718
1719/**
1720 * audit_getname - add a name to the list
1721 * @name: name to add
1722 *
1723 * Add a name to the list of audit names for this context.
1724 * Called from fs/namei.c:getname().
1725 */
1726void __audit_getname(struct filename *name)
1727{
1728 struct audit_context *context = current->audit_context;
1729 struct audit_names *n;
1730
1731 if (!context->in_syscall)
1732 return;
1733
1734 n = audit_alloc_name(context, AUDIT_TYPE_UNKNOWN);
1735 if (!n)
1736 return;
1737
1738 n->name = name;
1739 n->name_len = AUDIT_NAME_FULL;
1740 name->aname = n;
1741 name->refcnt++;
1742
1743 if (!context->pwd.dentry)
1744 get_fs_pwd(current->fs, &context->pwd);
1745}
1746
1747/**
1748 * __audit_inode - store the inode and device from a lookup
1749 * @name: name being audited
1750 * @dentry: dentry being audited
1751 * @flags: attributes for this particular entry
1752 */
1753void __audit_inode(struct filename *name, const struct dentry *dentry,
1754 unsigned int flags)
1755{
1756 struct audit_context *context = current->audit_context;
1757 struct inode *inode = d_backing_inode(dentry);
1758 struct audit_names *n;
1759 bool parent = flags & AUDIT_INODE_PARENT;
1760
1761 if (!context->in_syscall)
1762 return;
1763
1764 if (!name)
1765 goto out_alloc;
1766
1767 /*
1768 * If we have a pointer to an audit_names entry already, then we can
1769 * just use it directly if the type is correct.
1770 */
1771 n = name->aname;
1772 if (n) {
1773 if (parent) {
1774 if (n->type == AUDIT_TYPE_PARENT ||
1775 n->type == AUDIT_TYPE_UNKNOWN)
1776 goto out;
1777 } else {
1778 if (n->type != AUDIT_TYPE_PARENT)
1779 goto out;
1780 }
1781 }
1782
1783 list_for_each_entry_reverse(n, &context->names_list, list) {
1784 if (n->ino) {
1785 /* valid inode number, use that for the comparison */
1786 if (n->ino != inode->i_ino ||
1787 n->dev != inode->i_sb->s_dev)
1788 continue;
1789 } else if (n->name) {
1790 /* inode number has not been set, check the name */
1791 if (strcmp(n->name->name, name->name))
1792 continue;
1793 } else
1794 /* no inode and no name (?!) ... this is odd ... */
1795 continue;
1796
1797 /* match the correct record type */
1798 if (parent) {
1799 if (n->type == AUDIT_TYPE_PARENT ||
1800 n->type == AUDIT_TYPE_UNKNOWN)
1801 goto out;
1802 } else {
1803 if (n->type != AUDIT_TYPE_PARENT)
1804 goto out;
1805 }
1806 }
1807
1808out_alloc:
1809 /* unable to find an entry with both a matching name and type */
1810 n = audit_alloc_name(context, AUDIT_TYPE_UNKNOWN);
1811 if (!n)
1812 return;
1813 if (name) {
1814 n->name = name;
1815 name->refcnt++;
1816 }
1817
1818out:
1819 if (parent) {
1820 n->name_len = n->name ? parent_len(n->name->name) : AUDIT_NAME_FULL;
1821 n->type = AUDIT_TYPE_PARENT;
1822 if (flags & AUDIT_INODE_HIDDEN)
1823 n->hidden = true;
1824 } else {
1825 n->name_len = AUDIT_NAME_FULL;
1826 n->type = AUDIT_TYPE_NORMAL;
1827 }
1828 handle_path(dentry);
1829 audit_copy_inode(n, dentry, inode);
1830}
1831
1832void __audit_file(const struct file *file)
1833{
1834 __audit_inode(NULL, file->f_path.dentry, 0);
1835}
1836
1837/**
1838 * __audit_inode_child - collect inode info for created/removed objects
1839 * @parent: inode of dentry parent
1840 * @dentry: dentry being audited
1841 * @type: AUDIT_TYPE_* value that we're looking for
1842 *
1843 * For syscalls that create or remove filesystem objects, audit_inode
1844 * can only collect information for the filesystem object's parent.
1845 * This call updates the audit context with the child's information.
1846 * Syscalls that create a new filesystem object must be hooked after
1847 * the object is created. Syscalls that remove a filesystem object
1848 * must be hooked prior, in order to capture the target inode during
1849 * unsuccessful attempts.
1850 */
1851void __audit_inode_child(struct inode *parent,
1852 const struct dentry *dentry,
1853 const unsigned char type)
1854{
1855 struct audit_context *context = current->audit_context;
1856 struct inode *inode = d_backing_inode(dentry);
1857 const char *dname = dentry->d_name.name;
1858 struct audit_names *n, *found_parent = NULL, *found_child = NULL;
1859
1860 if (!context->in_syscall)
1861 return;
1862
1863 if (inode)
1864 handle_one(inode);
1865
1866 /* look for a parent entry first */
1867 list_for_each_entry(n, &context->names_list, list) {
1868 if (!n->name ||
1869 (n->type != AUDIT_TYPE_PARENT &&
1870 n->type != AUDIT_TYPE_UNKNOWN))
1871 continue;
1872
1873 if (n->ino == parent->i_ino && n->dev == parent->i_sb->s_dev &&
1874 !audit_compare_dname_path(dname,
1875 n->name->name, n->name_len)) {
1876 if (n->type == AUDIT_TYPE_UNKNOWN)
1877 n->type = AUDIT_TYPE_PARENT;
1878 found_parent = n;
1879 break;
1880 }
1881 }
1882
1883 /* is there a matching child entry? */
1884 list_for_each_entry(n, &context->names_list, list) {
1885 /* can only match entries that have a name */
1886 if (!n->name ||
1887 (n->type != type && n->type != AUDIT_TYPE_UNKNOWN))
1888 continue;
1889
1890 if (!strcmp(dname, n->name->name) ||
1891 !audit_compare_dname_path(dname, n->name->name,
1892 found_parent ?
1893 found_parent->name_len :
1894 AUDIT_NAME_FULL)) {
1895 if (n->type == AUDIT_TYPE_UNKNOWN)
1896 n->type = type;
1897 found_child = n;
1898 break;
1899 }
1900 }
1901
1902 if (!found_parent) {
1903 /* create a new, "anonymous" parent record */
1904 n = audit_alloc_name(context, AUDIT_TYPE_PARENT);
1905 if (!n)
1906 return;
1907 audit_copy_inode(n, NULL, parent);
1908 }
1909
1910 if (!found_child) {
1911 found_child = audit_alloc_name(context, type);
1912 if (!found_child)
1913 return;
1914
1915 /* Re-use the name belonging to the slot for a matching parent
1916 * directory. All names for this context are relinquished in
1917 * audit_free_names() */
1918 if (found_parent) {
1919 found_child->name = found_parent->name;
1920 found_child->name_len = AUDIT_NAME_FULL;
1921 found_child->name->refcnt++;
1922 }
1923 }
1924
1925 if (inode)
1926 audit_copy_inode(found_child, dentry, inode);
1927 else
1928 found_child->ino = AUDIT_INO_UNSET;
1929}
1930EXPORT_SYMBOL_GPL(__audit_inode_child);
1931
1932/**
1933 * auditsc_get_stamp - get local copies of audit_context values
1934 * @ctx: audit_context for the task
1935 * @t: timespec to store time recorded in the audit_context
1936 * @serial: serial value that is recorded in the audit_context
1937 *
1938 * Also sets the context as auditable.
1939 */
1940int auditsc_get_stamp(struct audit_context *ctx,
1941 struct timespec *t, unsigned int *serial)
1942{
1943 if (!ctx->in_syscall)
1944 return 0;
1945 if (!ctx->serial)
1946 ctx->serial = audit_serial();
1947 t->tv_sec = ctx->ctime.tv_sec;
1948 t->tv_nsec = ctx->ctime.tv_nsec;
1949 *serial = ctx->serial;
1950 if (!ctx->prio) {
1951 ctx->prio = 1;
1952 ctx->current_state = AUDIT_RECORD_CONTEXT;
1953 }
1954 return 1;
1955}
1956
1957/* global counter which is incremented every time something logs in */
1958static atomic_t session_id = ATOMIC_INIT(0);
1959
1960static int audit_set_loginuid_perm(kuid_t loginuid)
1961{
1962 /* if we are unset, we don't need privs */
1963 if (!audit_loginuid_set(current))
1964 return 0;
1965 /* if AUDIT_FEATURE_LOGINUID_IMMUTABLE means never ever allow a change*/
1966 if (is_audit_feature_set(AUDIT_FEATURE_LOGINUID_IMMUTABLE))
1967 return -EPERM;
1968 /* it is set, you need permission */
1969 if (!capable(CAP_AUDIT_CONTROL))
1970 return -EPERM;
1971 /* reject if this is not an unset and we don't allow that */
1972 if (is_audit_feature_set(AUDIT_FEATURE_ONLY_UNSET_LOGINUID) && uid_valid(loginuid))
1973 return -EPERM;
1974 return 0;
1975}
1976
1977static void audit_log_set_loginuid(kuid_t koldloginuid, kuid_t kloginuid,
1978 unsigned int oldsessionid, unsigned int sessionid,
1979 int rc)
1980{
1981 struct audit_buffer *ab;
1982 uid_t uid, oldloginuid, loginuid;
1983
1984 if (!audit_enabled)
1985 return;
1986
1987 uid = from_kuid(&init_user_ns, task_uid(current));
1988 oldloginuid = from_kuid(&init_user_ns, koldloginuid);
1989 loginuid = from_kuid(&init_user_ns, kloginuid),
1990
1991 ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_LOGIN);
1992 if (!ab)
1993 return;
1994 audit_log_format(ab, "pid=%d uid=%u", task_pid_nr(current), uid);
1995 audit_log_task_context(ab);
1996 audit_log_format(ab, " old-auid=%u auid=%u old-ses=%u ses=%u res=%d",
1997 oldloginuid, loginuid, oldsessionid, sessionid, !rc);
1998 audit_log_end(ab);
1999}
2000
2001/**
2002 * audit_set_loginuid - set current task's audit_context loginuid
2003 * @loginuid: loginuid value
2004 *
2005 * Returns 0.
2006 *
2007 * Called (set) from fs/proc/base.c::proc_loginuid_write().
2008 */
2009int audit_set_loginuid(kuid_t loginuid)
2010{
2011 struct task_struct *task = current;
2012 unsigned int oldsessionid, sessionid = (unsigned int)-1;
2013 kuid_t oldloginuid;
2014 int rc;
2015
2016 oldloginuid = audit_get_loginuid(current);
2017 oldsessionid = audit_get_sessionid(current);
2018
2019 rc = audit_set_loginuid_perm(loginuid);
2020 if (rc)
2021 goto out;
2022
2023 /* are we setting or clearing? */
2024 if (uid_valid(loginuid))
2025 sessionid = (unsigned int)atomic_inc_return(&session_id);
2026
2027 task->sessionid = sessionid;
2028 task->loginuid = loginuid;
2029out:
2030 audit_log_set_loginuid(oldloginuid, loginuid, oldsessionid, sessionid, rc);
2031 return rc;
2032}
2033
2034/**
2035 * __audit_mq_open - record audit data for a POSIX MQ open
2036 * @oflag: open flag
2037 * @mode: mode bits
2038 * @attr: queue attributes
2039 *
2040 */
2041void __audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr)
2042{
2043 struct audit_context *context = current->audit_context;
2044
2045 if (attr)
2046 memcpy(&context->mq_open.attr, attr, sizeof(struct mq_attr));
2047 else
2048 memset(&context->mq_open.attr, 0, sizeof(struct mq_attr));
2049
2050 context->mq_open.oflag = oflag;
2051 context->mq_open.mode = mode;
2052
2053 context->type = AUDIT_MQ_OPEN;
2054}
2055
2056/**
2057 * __audit_mq_sendrecv - record audit data for a POSIX MQ timed send/receive
2058 * @mqdes: MQ descriptor
2059 * @msg_len: Message length
2060 * @msg_prio: Message priority
2061 * @abs_timeout: Message timeout in absolute time
2062 *
2063 */
2064void __audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio,
2065 const struct timespec *abs_timeout)
2066{
2067 struct audit_context *context = current->audit_context;
2068 struct timespec *p = &context->mq_sendrecv.abs_timeout;
2069
2070 if (abs_timeout)
2071 memcpy(p, abs_timeout, sizeof(struct timespec));
2072 else
2073 memset(p, 0, sizeof(struct timespec));
2074
2075 context->mq_sendrecv.mqdes = mqdes;
2076 context->mq_sendrecv.msg_len = msg_len;
2077 context->mq_sendrecv.msg_prio = msg_prio;
2078
2079 context->type = AUDIT_MQ_SENDRECV;
2080}
2081
2082/**
2083 * __audit_mq_notify - record audit data for a POSIX MQ notify
2084 * @mqdes: MQ descriptor
2085 * @notification: Notification event
2086 *
2087 */
2088
2089void __audit_mq_notify(mqd_t mqdes, const struct sigevent *notification)
2090{
2091 struct audit_context *context = current->audit_context;
2092
2093 if (notification)
2094 context->mq_notify.sigev_signo = notification->sigev_signo;
2095 else
2096 context->mq_notify.sigev_signo = 0;
2097
2098 context->mq_notify.mqdes = mqdes;
2099 context->type = AUDIT_MQ_NOTIFY;
2100}
2101
2102/**
2103 * __audit_mq_getsetattr - record audit data for a POSIX MQ get/set attribute
2104 * @mqdes: MQ descriptor
2105 * @mqstat: MQ flags
2106 *
2107 */
2108void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
2109{
2110 struct audit_context *context = current->audit_context;
2111 context->mq_getsetattr.mqdes = mqdes;
2112 context->mq_getsetattr.mqstat = *mqstat;
2113 context->type = AUDIT_MQ_GETSETATTR;
2114}
2115
2116/**
2117 * audit_ipc_obj - record audit data for ipc object
2118 * @ipcp: ipc permissions
2119 *
2120 */
2121void __audit_ipc_obj(struct kern_ipc_perm *ipcp)
2122{
2123 struct audit_context *context = current->audit_context;
2124 context->ipc.uid = ipcp->uid;
2125 context->ipc.gid = ipcp->gid;
2126 context->ipc.mode = ipcp->mode;
2127 context->ipc.has_perm = 0;
2128 security_ipc_getsecid(ipcp, &context->ipc.osid);
2129 context->type = AUDIT_IPC;
2130}
2131
2132/**
2133 * audit_ipc_set_perm - record audit data for new ipc permissions
2134 * @qbytes: msgq bytes
2135 * @uid: msgq user id
2136 * @gid: msgq group id
2137 * @mode: msgq mode (permissions)
2138 *
2139 * Called only after audit_ipc_obj().
2140 */
2141void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode)
2142{
2143 struct audit_context *context = current->audit_context;
2144
2145 context->ipc.qbytes = qbytes;
2146 context->ipc.perm_uid = uid;
2147 context->ipc.perm_gid = gid;
2148 context->ipc.perm_mode = mode;
2149 context->ipc.has_perm = 1;
2150}
2151
2152void __audit_bprm(struct linux_binprm *bprm)
2153{
2154 struct audit_context *context = current->audit_context;
2155
2156 context->type = AUDIT_EXECVE;
2157 context->execve.argc = bprm->argc;
2158}
2159
2160
2161/**
2162 * audit_socketcall - record audit data for sys_socketcall
2163 * @nargs: number of args, which should not be more than AUDITSC_ARGS.
2164 * @args: args array
2165 *
2166 */
2167int __audit_socketcall(int nargs, unsigned long *args)
2168{
2169 struct audit_context *context = current->audit_context;
2170
2171 if (nargs <= 0 || nargs > AUDITSC_ARGS || !args)
2172 return -EINVAL;
2173 context->type = AUDIT_SOCKETCALL;
2174 context->socketcall.nargs = nargs;
2175 memcpy(context->socketcall.args, args, nargs * sizeof(unsigned long));
2176 return 0;
2177}
2178
2179/**
2180 * __audit_fd_pair - record audit data for pipe and socketpair
2181 * @fd1: the first file descriptor
2182 * @fd2: the second file descriptor
2183 *
2184 */
2185void __audit_fd_pair(int fd1, int fd2)
2186{
2187 struct audit_context *context = current->audit_context;
2188 context->fds[0] = fd1;
2189 context->fds[1] = fd2;
2190}
2191
2192/**
2193 * audit_sockaddr - record audit data for sys_bind, sys_connect, sys_sendto
2194 * @len: data length in user space
2195 * @a: data address in kernel space
2196 *
2197 * Returns 0 for success or NULL context or < 0 on error.
2198 */
2199int __audit_sockaddr(int len, void *a)
2200{
2201 struct audit_context *context = current->audit_context;
2202
2203 if (!context->sockaddr) {
2204 void *p = kmalloc(sizeof(struct sockaddr_storage), GFP_KERNEL);
2205 if (!p)
2206 return -ENOMEM;
2207 context->sockaddr = p;
2208 }
2209
2210 context->sockaddr_len = len;
2211 memcpy(context->sockaddr, a, len);
2212 return 0;
2213}
2214
2215void __audit_ptrace(struct task_struct *t)
2216{
2217 struct audit_context *context = current->audit_context;
2218
2219 context->target_pid = task_pid_nr(t);
2220 context->target_auid = audit_get_loginuid(t);
2221 context->target_uid = task_uid(t);
2222 context->target_sessionid = audit_get_sessionid(t);
2223 security_task_getsecid(t, &context->target_sid);
2224 memcpy(context->target_comm, t->comm, TASK_COMM_LEN);
2225}
2226
2227/**
2228 * audit_signal_info - record signal info for shutting down audit subsystem
2229 * @sig: signal value
2230 * @t: task being signaled
2231 *
2232 * If the audit subsystem is being terminated, record the task (pid)
2233 * and uid that is doing that.
2234 */
2235int __audit_signal_info(int sig, struct task_struct *t)
2236{
2237 struct audit_aux_data_pids *axp;
2238 struct task_struct *tsk = current;
2239 struct audit_context *ctx = tsk->audit_context;
2240 kuid_t uid = current_uid(), t_uid = task_uid(t);
2241
2242 if (audit_pid && t->tgid == audit_pid) {
2243 if (sig == SIGTERM || sig == SIGHUP || sig == SIGUSR1 || sig == SIGUSR2) {
2244 audit_sig_pid = task_pid_nr(tsk);
2245 if (uid_valid(tsk->loginuid))
2246 audit_sig_uid = tsk->loginuid;
2247 else
2248 audit_sig_uid = uid;
2249 security_task_getsecid(tsk, &audit_sig_sid);
2250 }
2251 if (!audit_signals || audit_dummy_context())
2252 return 0;
2253 }
2254
2255 /* optimize the common case by putting first signal recipient directly
2256 * in audit_context */
2257 if (!ctx->target_pid) {
2258 ctx->target_pid = task_tgid_nr(t);
2259 ctx->target_auid = audit_get_loginuid(t);
2260 ctx->target_uid = t_uid;
2261 ctx->target_sessionid = audit_get_sessionid(t);
2262 security_task_getsecid(t, &ctx->target_sid);
2263 memcpy(ctx->target_comm, t->comm, TASK_COMM_LEN);
2264 return 0;
2265 }
2266
2267 axp = (void *)ctx->aux_pids;
2268 if (!axp || axp->pid_count == AUDIT_AUX_PIDS) {
2269 axp = kzalloc(sizeof(*axp), GFP_ATOMIC);
2270 if (!axp)
2271 return -ENOMEM;
2272
2273 axp->d.type = AUDIT_OBJ_PID;
2274 axp->d.next = ctx->aux_pids;
2275 ctx->aux_pids = (void *)axp;
2276 }
2277 BUG_ON(axp->pid_count >= AUDIT_AUX_PIDS);
2278
2279 axp->target_pid[axp->pid_count] = task_tgid_nr(t);
2280 axp->target_auid[axp->pid_count] = audit_get_loginuid(t);
2281 axp->target_uid[axp->pid_count] = t_uid;
2282 axp->target_sessionid[axp->pid_count] = audit_get_sessionid(t);
2283 security_task_getsecid(t, &axp->target_sid[axp->pid_count]);
2284 memcpy(axp->target_comm[axp->pid_count], t->comm, TASK_COMM_LEN);
2285 axp->pid_count++;
2286
2287 return 0;
2288}
2289
2290/**
2291 * __audit_log_bprm_fcaps - store information about a loading bprm and relevant fcaps
2292 * @bprm: pointer to the bprm being processed
2293 * @new: the proposed new credentials
2294 * @old: the old credentials
2295 *
2296 * Simply check if the proc already has the caps given by the file and if not
2297 * store the priv escalation info for later auditing at the end of the syscall
2298 *
2299 * -Eric
2300 */
2301int __audit_log_bprm_fcaps(struct linux_binprm *bprm,
2302 const struct cred *new, const struct cred *old)
2303{
2304 struct audit_aux_data_bprm_fcaps *ax;
2305 struct audit_context *context = current->audit_context;
2306 struct cpu_vfs_cap_data vcaps;
2307
2308 ax = kmalloc(sizeof(*ax), GFP_KERNEL);
2309 if (!ax)
2310 return -ENOMEM;
2311
2312 ax->d.type = AUDIT_BPRM_FCAPS;
2313 ax->d.next = context->aux;
2314 context->aux = (void *)ax;
2315
2316 get_vfs_caps_from_disk(bprm->file->f_path.dentry, &vcaps);
2317
2318 ax->fcap.permitted = vcaps.permitted;
2319 ax->fcap.inheritable = vcaps.inheritable;
2320 ax->fcap.fE = !!(vcaps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE);
2321 ax->fcap_ver = (vcaps.magic_etc & VFS_CAP_REVISION_MASK) >> VFS_CAP_REVISION_SHIFT;
2322
2323 ax->old_pcap.permitted = old->cap_permitted;
2324 ax->old_pcap.inheritable = old->cap_inheritable;
2325 ax->old_pcap.effective = old->cap_effective;
2326
2327 ax->new_pcap.permitted = new->cap_permitted;
2328 ax->new_pcap.inheritable = new->cap_inheritable;
2329 ax->new_pcap.effective = new->cap_effective;
2330 return 0;
2331}
2332
2333/**
2334 * __audit_log_capset - store information about the arguments to the capset syscall
2335 * @new: the new credentials
2336 * @old: the old (current) credentials
2337 *
2338 * Record the arguments userspace sent to sys_capset for later printing by the
2339 * audit system if applicable
2340 */
2341void __audit_log_capset(const struct cred *new, const struct cred *old)
2342{
2343 struct audit_context *context = current->audit_context;
2344 context->capset.pid = task_pid_nr(current);
2345 context->capset.cap.effective = new->cap_effective;
2346 context->capset.cap.inheritable = new->cap_effective;
2347 context->capset.cap.permitted = new->cap_permitted;
2348 context->type = AUDIT_CAPSET;
2349}
2350
2351void __audit_mmap_fd(int fd, int flags)
2352{
2353 struct audit_context *context = current->audit_context;
2354 context->mmap.fd = fd;
2355 context->mmap.flags = flags;
2356 context->type = AUDIT_MMAP;
2357}
2358
2359static void audit_log_task(struct audit_buffer *ab)
2360{
2361 kuid_t auid, uid;
2362 kgid_t gid;
2363 unsigned int sessionid;
2364 char comm[sizeof(current->comm)];
2365
2366 auid = audit_get_loginuid(current);
2367 sessionid = audit_get_sessionid(current);
2368 current_uid_gid(&uid, &gid);
2369
2370 audit_log_format(ab, "auid=%u uid=%u gid=%u ses=%u",
2371 from_kuid(&init_user_ns, auid),
2372 from_kuid(&init_user_ns, uid),
2373 from_kgid(&init_user_ns, gid),
2374 sessionid);
2375 audit_log_task_context(ab);
2376 audit_log_format(ab, " pid=%d comm=", task_pid_nr(current));
2377 audit_log_untrustedstring(ab, get_task_comm(comm, current));
2378 audit_log_d_path_exe(ab, current->mm);
2379}
2380
2381/**
2382 * audit_core_dumps - record information about processes that end abnormally
2383 * @signr: signal value
2384 *
2385 * If a process ends with a core dump, something fishy is going on and we
2386 * should record the event for investigation.
2387 */
2388void audit_core_dumps(long signr)
2389{
2390 struct audit_buffer *ab;
2391
2392 if (!audit_enabled)
2393 return;
2394
2395 if (signr == SIGQUIT) /* don't care for those */
2396 return;
2397
2398 ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_ANOM_ABEND);
2399 if (unlikely(!ab))
2400 return;
2401 audit_log_task(ab);
2402 audit_log_format(ab, " sig=%ld", signr);
2403 audit_log_end(ab);
2404}
2405
2406void __audit_seccomp(unsigned long syscall, long signr, int code)
2407{
2408 struct audit_buffer *ab;
2409
2410 ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_SECCOMP);
2411 if (unlikely(!ab))
2412 return;
2413 audit_log_task(ab);
2414 audit_log_format(ab, " sig=%ld arch=%x syscall=%ld compat=%d ip=0x%lx code=0x%x",
2415 signr, syscall_get_arch(), syscall,
2416 in_compat_syscall(), KSTK_EIP(current), code);
2417 audit_log_end(ab);
2418}
2419
2420struct list_head *audit_killed_trees(void)
2421{
2422 struct audit_context *ctx = current->audit_context;
2423 if (likely(!ctx || !ctx->in_syscall))
2424 return NULL;
2425 return &ctx->killed_trees;
2426}