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1// SPDX-License-Identifier: GPL-2.0-or-later
2/* auditsc.c -- System-call auditing support
3 * Handles all system-call specific auditing features.
4 *
5 * Copyright 2003-2004 Red Hat Inc., Durham, North Carolina.
6 * Copyright 2005 Hewlett-Packard Development Company, L.P.
7 * Copyright (C) 2005, 2006 IBM Corporation
8 * All Rights Reserved.
9 *
10 * Written by Rickard E. (Rik) Faith <faith@redhat.com>
11 *
12 * Many of the ideas implemented here are from Stephen C. Tweedie,
13 * especially the idea of avoiding a copy by using getname.
14 *
15 * The method for actual interception of syscall entry and exit (not in
16 * this file -- see entry.S) is based on a GPL'd patch written by
17 * okir@suse.de and Copyright 2003 SuSE Linux AG.
18 *
19 * POSIX message queue support added by George Wilson <ltcgcw@us.ibm.com>,
20 * 2006.
21 *
22 * The support of additional filter rules compares (>, <, >=, <=) was
23 * added by Dustin Kirkland <dustin.kirkland@us.ibm.com>, 2005.
24 *
25 * Modified by Amy Griffis <amy.griffis@hp.com> to collect additional
26 * filesystem information.
27 *
28 * Subject and object context labeling support added by <danjones@us.ibm.com>
29 * and <dustin.kirkland@us.ibm.com> for LSPP certification compliance.
30 */
31
32#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
33
34#include <linux/init.h>
35#include <asm/types.h>
36#include <linux/atomic.h>
37#include <linux/fs.h>
38#include <linux/namei.h>
39#include <linux/mm.h>
40#include <linux/export.h>
41#include <linux/slab.h>
42#include <linux/mount.h>
43#include <linux/socket.h>
44#include <linux/mqueue.h>
45#include <linux/audit.h>
46#include <linux/personality.h>
47#include <linux/time.h>
48#include <linux/netlink.h>
49#include <linux/compiler.h>
50#include <asm/unistd.h>
51#include <linux/security.h>
52#include <linux/list.h>
53#include <linux/binfmts.h>
54#include <linux/highmem.h>
55#include <linux/syscalls.h>
56#include <asm/syscall.h>
57#include <linux/capability.h>
58#include <linux/fs_struct.h>
59#include <linux/compat.h>
60#include <linux/ctype.h>
61#include <linux/string.h>
62#include <linux/uaccess.h>
63#include <linux/fsnotify_backend.h>
64#include <uapi/linux/limits.h>
65#include <uapi/linux/netfilter/nf_tables.h>
66#include <uapi/linux/openat2.h> // struct open_how
67#include <uapi/linux/fanotify.h>
68
69#include "audit.h"
70
71/* flags stating the success for a syscall */
72#define AUDITSC_INVALID 0
73#define AUDITSC_SUCCESS 1
74#define AUDITSC_FAILURE 2
75
76/* no execve audit message should be longer than this (userspace limits),
77 * see the note near the top of audit_log_execve_info() about this value */
78#define MAX_EXECVE_AUDIT_LEN 7500
79
80/* max length to print of cmdline/proctitle value during audit */
81#define MAX_PROCTITLE_AUDIT_LEN 128
82
83/* number of audit rules */
84int audit_n_rules;
85
86/* determines whether we collect data for signals sent */
87int audit_signals;
88
89struct audit_aux_data {
90 struct audit_aux_data *next;
91 int type;
92};
93
94/* Number of target pids per aux struct. */
95#define AUDIT_AUX_PIDS 16
96
97struct audit_aux_data_pids {
98 struct audit_aux_data d;
99 pid_t target_pid[AUDIT_AUX_PIDS];
100 kuid_t target_auid[AUDIT_AUX_PIDS];
101 kuid_t target_uid[AUDIT_AUX_PIDS];
102 unsigned int target_sessionid[AUDIT_AUX_PIDS];
103 struct lsm_prop target_ref[AUDIT_AUX_PIDS];
104 char target_comm[AUDIT_AUX_PIDS][TASK_COMM_LEN];
105 int pid_count;
106};
107
108struct audit_aux_data_bprm_fcaps {
109 struct audit_aux_data d;
110 struct audit_cap_data fcap;
111 unsigned int fcap_ver;
112 struct audit_cap_data old_pcap;
113 struct audit_cap_data new_pcap;
114};
115
116struct audit_tree_refs {
117 struct audit_tree_refs *next;
118 struct audit_chunk *c[31];
119};
120
121struct audit_nfcfgop_tab {
122 enum audit_nfcfgop op;
123 const char *s;
124};
125
126static const struct audit_nfcfgop_tab audit_nfcfgs[] = {
127 { AUDIT_XT_OP_REGISTER, "xt_register" },
128 { AUDIT_XT_OP_REPLACE, "xt_replace" },
129 { AUDIT_XT_OP_UNREGISTER, "xt_unregister" },
130 { AUDIT_NFT_OP_TABLE_REGISTER, "nft_register_table" },
131 { AUDIT_NFT_OP_TABLE_UNREGISTER, "nft_unregister_table" },
132 { AUDIT_NFT_OP_CHAIN_REGISTER, "nft_register_chain" },
133 { AUDIT_NFT_OP_CHAIN_UNREGISTER, "nft_unregister_chain" },
134 { AUDIT_NFT_OP_RULE_REGISTER, "nft_register_rule" },
135 { AUDIT_NFT_OP_RULE_UNREGISTER, "nft_unregister_rule" },
136 { AUDIT_NFT_OP_SET_REGISTER, "nft_register_set" },
137 { AUDIT_NFT_OP_SET_UNREGISTER, "nft_unregister_set" },
138 { AUDIT_NFT_OP_SETELEM_REGISTER, "nft_register_setelem" },
139 { AUDIT_NFT_OP_SETELEM_UNREGISTER, "nft_unregister_setelem" },
140 { AUDIT_NFT_OP_GEN_REGISTER, "nft_register_gen" },
141 { AUDIT_NFT_OP_OBJ_REGISTER, "nft_register_obj" },
142 { AUDIT_NFT_OP_OBJ_UNREGISTER, "nft_unregister_obj" },
143 { AUDIT_NFT_OP_OBJ_RESET, "nft_reset_obj" },
144 { AUDIT_NFT_OP_FLOWTABLE_REGISTER, "nft_register_flowtable" },
145 { AUDIT_NFT_OP_FLOWTABLE_UNREGISTER, "nft_unregister_flowtable" },
146 { AUDIT_NFT_OP_SETELEM_RESET, "nft_reset_setelem" },
147 { AUDIT_NFT_OP_RULE_RESET, "nft_reset_rule" },
148 { AUDIT_NFT_OP_INVALID, "nft_invalid" },
149};
150
151static int audit_match_perm(struct audit_context *ctx, int mask)
152{
153 unsigned n;
154
155 if (unlikely(!ctx))
156 return 0;
157 n = ctx->major;
158
159 switch (audit_classify_syscall(ctx->arch, n)) {
160 case AUDITSC_NATIVE:
161 if ((mask & AUDIT_PERM_WRITE) &&
162 audit_match_class(AUDIT_CLASS_WRITE, n))
163 return 1;
164 if ((mask & AUDIT_PERM_READ) &&
165 audit_match_class(AUDIT_CLASS_READ, n))
166 return 1;
167 if ((mask & AUDIT_PERM_ATTR) &&
168 audit_match_class(AUDIT_CLASS_CHATTR, n))
169 return 1;
170 return 0;
171 case AUDITSC_COMPAT: /* 32bit on biarch */
172 if ((mask & AUDIT_PERM_WRITE) &&
173 audit_match_class(AUDIT_CLASS_WRITE_32, n))
174 return 1;
175 if ((mask & AUDIT_PERM_READ) &&
176 audit_match_class(AUDIT_CLASS_READ_32, n))
177 return 1;
178 if ((mask & AUDIT_PERM_ATTR) &&
179 audit_match_class(AUDIT_CLASS_CHATTR_32, n))
180 return 1;
181 return 0;
182 case AUDITSC_OPEN:
183 return mask & ACC_MODE(ctx->argv[1]);
184 case AUDITSC_OPENAT:
185 return mask & ACC_MODE(ctx->argv[2]);
186 case AUDITSC_SOCKETCALL:
187 return ((mask & AUDIT_PERM_WRITE) && ctx->argv[0] == SYS_BIND);
188 case AUDITSC_EXECVE:
189 return mask & AUDIT_PERM_EXEC;
190 case AUDITSC_OPENAT2:
191 return mask & ACC_MODE((u32)ctx->openat2.flags);
192 default:
193 return 0;
194 }
195}
196
197static int audit_match_filetype(struct audit_context *ctx, int val)
198{
199 struct audit_names *n;
200 umode_t mode = (umode_t)val;
201
202 if (unlikely(!ctx))
203 return 0;
204
205 list_for_each_entry(n, &ctx->names_list, list) {
206 if ((n->ino != AUDIT_INO_UNSET) &&
207 ((n->mode & S_IFMT) == mode))
208 return 1;
209 }
210
211 return 0;
212}
213
214/*
215 * We keep a linked list of fixed-sized (31 pointer) arrays of audit_chunk *;
216 * ->first_trees points to its beginning, ->trees - to the current end of data.
217 * ->tree_count is the number of free entries in array pointed to by ->trees.
218 * Original condition is (NULL, NULL, 0); as soon as it grows we never revert to NULL,
219 * "empty" becomes (p, p, 31) afterwards. We don't shrink the list (and seriously,
220 * it's going to remain 1-element for almost any setup) until we free context itself.
221 * References in it _are_ dropped - at the same time we free/drop aux stuff.
222 */
223
224static void audit_set_auditable(struct audit_context *ctx)
225{
226 if (!ctx->prio) {
227 ctx->prio = 1;
228 ctx->current_state = AUDIT_STATE_RECORD;
229 }
230}
231
232static int put_tree_ref(struct audit_context *ctx, struct audit_chunk *chunk)
233{
234 struct audit_tree_refs *p = ctx->trees;
235 int left = ctx->tree_count;
236
237 if (likely(left)) {
238 p->c[--left] = chunk;
239 ctx->tree_count = left;
240 return 1;
241 }
242 if (!p)
243 return 0;
244 p = p->next;
245 if (p) {
246 p->c[30] = chunk;
247 ctx->trees = p;
248 ctx->tree_count = 30;
249 return 1;
250 }
251 return 0;
252}
253
254static int grow_tree_refs(struct audit_context *ctx)
255{
256 struct audit_tree_refs *p = ctx->trees;
257
258 ctx->trees = kzalloc(sizeof(struct audit_tree_refs), GFP_KERNEL);
259 if (!ctx->trees) {
260 ctx->trees = p;
261 return 0;
262 }
263 if (p)
264 p->next = ctx->trees;
265 else
266 ctx->first_trees = ctx->trees;
267 ctx->tree_count = 31;
268 return 1;
269}
270
271static void unroll_tree_refs(struct audit_context *ctx,
272 struct audit_tree_refs *p, int count)
273{
274 struct audit_tree_refs *q;
275 int n;
276
277 if (!p) {
278 /* we started with empty chain */
279 p = ctx->first_trees;
280 count = 31;
281 /* if the very first allocation has failed, nothing to do */
282 if (!p)
283 return;
284 }
285 n = count;
286 for (q = p; q != ctx->trees; q = q->next, n = 31) {
287 while (n--) {
288 audit_put_chunk(q->c[n]);
289 q->c[n] = NULL;
290 }
291 }
292 while (n-- > ctx->tree_count) {
293 audit_put_chunk(q->c[n]);
294 q->c[n] = NULL;
295 }
296 ctx->trees = p;
297 ctx->tree_count = count;
298}
299
300static void free_tree_refs(struct audit_context *ctx)
301{
302 struct audit_tree_refs *p, *q;
303
304 for (p = ctx->first_trees; p; p = q) {
305 q = p->next;
306 kfree(p);
307 }
308}
309
310static int match_tree_refs(struct audit_context *ctx, struct audit_tree *tree)
311{
312 struct audit_tree_refs *p;
313 int n;
314
315 if (!tree)
316 return 0;
317 /* full ones */
318 for (p = ctx->first_trees; p != ctx->trees; p = p->next) {
319 for (n = 0; n < 31; n++)
320 if (audit_tree_match(p->c[n], tree))
321 return 1;
322 }
323 /* partial */
324 if (p) {
325 for (n = ctx->tree_count; n < 31; n++)
326 if (audit_tree_match(p->c[n], tree))
327 return 1;
328 }
329 return 0;
330}
331
332static int audit_compare_uid(kuid_t uid,
333 struct audit_names *name,
334 struct audit_field *f,
335 struct audit_context *ctx)
336{
337 struct audit_names *n;
338 int rc;
339
340 if (name) {
341 rc = audit_uid_comparator(uid, f->op, name->uid);
342 if (rc)
343 return rc;
344 }
345
346 if (ctx) {
347 list_for_each_entry(n, &ctx->names_list, list) {
348 rc = audit_uid_comparator(uid, f->op, n->uid);
349 if (rc)
350 return rc;
351 }
352 }
353 return 0;
354}
355
356static int audit_compare_gid(kgid_t gid,
357 struct audit_names *name,
358 struct audit_field *f,
359 struct audit_context *ctx)
360{
361 struct audit_names *n;
362 int rc;
363
364 if (name) {
365 rc = audit_gid_comparator(gid, f->op, name->gid);
366 if (rc)
367 return rc;
368 }
369
370 if (ctx) {
371 list_for_each_entry(n, &ctx->names_list, list) {
372 rc = audit_gid_comparator(gid, f->op, n->gid);
373 if (rc)
374 return rc;
375 }
376 }
377 return 0;
378}
379
380static int audit_field_compare(struct task_struct *tsk,
381 const struct cred *cred,
382 struct audit_field *f,
383 struct audit_context *ctx,
384 struct audit_names *name)
385{
386 switch (f->val) {
387 /* process to file object comparisons */
388 case AUDIT_COMPARE_UID_TO_OBJ_UID:
389 return audit_compare_uid(cred->uid, name, f, ctx);
390 case AUDIT_COMPARE_GID_TO_OBJ_GID:
391 return audit_compare_gid(cred->gid, name, f, ctx);
392 case AUDIT_COMPARE_EUID_TO_OBJ_UID:
393 return audit_compare_uid(cred->euid, name, f, ctx);
394 case AUDIT_COMPARE_EGID_TO_OBJ_GID:
395 return audit_compare_gid(cred->egid, name, f, ctx);
396 case AUDIT_COMPARE_AUID_TO_OBJ_UID:
397 return audit_compare_uid(audit_get_loginuid(tsk), name, f, ctx);
398 case AUDIT_COMPARE_SUID_TO_OBJ_UID:
399 return audit_compare_uid(cred->suid, name, f, ctx);
400 case AUDIT_COMPARE_SGID_TO_OBJ_GID:
401 return audit_compare_gid(cred->sgid, name, f, ctx);
402 case AUDIT_COMPARE_FSUID_TO_OBJ_UID:
403 return audit_compare_uid(cred->fsuid, name, f, ctx);
404 case AUDIT_COMPARE_FSGID_TO_OBJ_GID:
405 return audit_compare_gid(cred->fsgid, name, f, ctx);
406 /* uid comparisons */
407 case AUDIT_COMPARE_UID_TO_AUID:
408 return audit_uid_comparator(cred->uid, f->op,
409 audit_get_loginuid(tsk));
410 case AUDIT_COMPARE_UID_TO_EUID:
411 return audit_uid_comparator(cred->uid, f->op, cred->euid);
412 case AUDIT_COMPARE_UID_TO_SUID:
413 return audit_uid_comparator(cred->uid, f->op, cred->suid);
414 case AUDIT_COMPARE_UID_TO_FSUID:
415 return audit_uid_comparator(cred->uid, f->op, cred->fsuid);
416 /* auid comparisons */
417 case AUDIT_COMPARE_AUID_TO_EUID:
418 return audit_uid_comparator(audit_get_loginuid(tsk), f->op,
419 cred->euid);
420 case AUDIT_COMPARE_AUID_TO_SUID:
421 return audit_uid_comparator(audit_get_loginuid(tsk), f->op,
422 cred->suid);
423 case AUDIT_COMPARE_AUID_TO_FSUID:
424 return audit_uid_comparator(audit_get_loginuid(tsk), f->op,
425 cred->fsuid);
426 /* euid comparisons */
427 case AUDIT_COMPARE_EUID_TO_SUID:
428 return audit_uid_comparator(cred->euid, f->op, cred->suid);
429 case AUDIT_COMPARE_EUID_TO_FSUID:
430 return audit_uid_comparator(cred->euid, f->op, cred->fsuid);
431 /* suid comparisons */
432 case AUDIT_COMPARE_SUID_TO_FSUID:
433 return audit_uid_comparator(cred->suid, f->op, cred->fsuid);
434 /* gid comparisons */
435 case AUDIT_COMPARE_GID_TO_EGID:
436 return audit_gid_comparator(cred->gid, f->op, cred->egid);
437 case AUDIT_COMPARE_GID_TO_SGID:
438 return audit_gid_comparator(cred->gid, f->op, cred->sgid);
439 case AUDIT_COMPARE_GID_TO_FSGID:
440 return audit_gid_comparator(cred->gid, f->op, cred->fsgid);
441 /* egid comparisons */
442 case AUDIT_COMPARE_EGID_TO_SGID:
443 return audit_gid_comparator(cred->egid, f->op, cred->sgid);
444 case AUDIT_COMPARE_EGID_TO_FSGID:
445 return audit_gid_comparator(cred->egid, f->op, cred->fsgid);
446 /* sgid comparison */
447 case AUDIT_COMPARE_SGID_TO_FSGID:
448 return audit_gid_comparator(cred->sgid, f->op, cred->fsgid);
449 default:
450 WARN(1, "Missing AUDIT_COMPARE define. Report as a bug\n");
451 return 0;
452 }
453 return 0;
454}
455
456/* Determine if any context name data matches a rule's watch data */
457/* Compare a task_struct with an audit_rule. Return 1 on match, 0
458 * otherwise.
459 *
460 * If task_creation is true, this is an explicit indication that we are
461 * filtering a task rule at task creation time. This and tsk == current are
462 * the only situations where tsk->cred may be accessed without an rcu read lock.
463 */
464static int audit_filter_rules(struct task_struct *tsk,
465 struct audit_krule *rule,
466 struct audit_context *ctx,
467 struct audit_names *name,
468 enum audit_state *state,
469 bool task_creation)
470{
471 const struct cred *cred;
472 int i, need_sid = 1;
473 struct lsm_prop prop = { };
474 unsigned int sessionid;
475
476 if (ctx && rule->prio <= ctx->prio)
477 return 0;
478
479 cred = rcu_dereference_check(tsk->cred, tsk == current || task_creation);
480
481 for (i = 0; i < rule->field_count; i++) {
482 struct audit_field *f = &rule->fields[i];
483 struct audit_names *n;
484 int result = 0;
485 pid_t pid;
486
487 switch (f->type) {
488 case AUDIT_PID:
489 pid = task_tgid_nr(tsk);
490 result = audit_comparator(pid, f->op, f->val);
491 break;
492 case AUDIT_PPID:
493 if (ctx) {
494 if (!ctx->ppid)
495 ctx->ppid = task_ppid_nr(tsk);
496 result = audit_comparator(ctx->ppid, f->op, f->val);
497 }
498 break;
499 case AUDIT_EXE:
500 result = audit_exe_compare(tsk, rule->exe);
501 if (f->op == Audit_not_equal)
502 result = !result;
503 break;
504 case AUDIT_UID:
505 result = audit_uid_comparator(cred->uid, f->op, f->uid);
506 break;
507 case AUDIT_EUID:
508 result = audit_uid_comparator(cred->euid, f->op, f->uid);
509 break;
510 case AUDIT_SUID:
511 result = audit_uid_comparator(cred->suid, f->op, f->uid);
512 break;
513 case AUDIT_FSUID:
514 result = audit_uid_comparator(cred->fsuid, f->op, f->uid);
515 break;
516 case AUDIT_GID:
517 result = audit_gid_comparator(cred->gid, f->op, f->gid);
518 if (f->op == Audit_equal) {
519 if (!result)
520 result = groups_search(cred->group_info, f->gid);
521 } else if (f->op == Audit_not_equal) {
522 if (result)
523 result = !groups_search(cred->group_info, f->gid);
524 }
525 break;
526 case AUDIT_EGID:
527 result = audit_gid_comparator(cred->egid, f->op, f->gid);
528 if (f->op == Audit_equal) {
529 if (!result)
530 result = groups_search(cred->group_info, f->gid);
531 } else if (f->op == Audit_not_equal) {
532 if (result)
533 result = !groups_search(cred->group_info, f->gid);
534 }
535 break;
536 case AUDIT_SGID:
537 result = audit_gid_comparator(cred->sgid, f->op, f->gid);
538 break;
539 case AUDIT_FSGID:
540 result = audit_gid_comparator(cred->fsgid, f->op, f->gid);
541 break;
542 case AUDIT_SESSIONID:
543 sessionid = audit_get_sessionid(tsk);
544 result = audit_comparator(sessionid, f->op, f->val);
545 break;
546 case AUDIT_PERS:
547 result = audit_comparator(tsk->personality, f->op, f->val);
548 break;
549 case AUDIT_ARCH:
550 if (ctx)
551 result = audit_comparator(ctx->arch, f->op, f->val);
552 break;
553
554 case AUDIT_EXIT:
555 if (ctx && ctx->return_valid != AUDITSC_INVALID)
556 result = audit_comparator(ctx->return_code, f->op, f->val);
557 break;
558 case AUDIT_SUCCESS:
559 if (ctx && ctx->return_valid != AUDITSC_INVALID) {
560 if (f->val)
561 result = audit_comparator(ctx->return_valid, f->op, AUDITSC_SUCCESS);
562 else
563 result = audit_comparator(ctx->return_valid, f->op, AUDITSC_FAILURE);
564 }
565 break;
566 case AUDIT_DEVMAJOR:
567 if (name) {
568 if (audit_comparator(MAJOR(name->dev), f->op, f->val) ||
569 audit_comparator(MAJOR(name->rdev), f->op, f->val))
570 ++result;
571 } else if (ctx) {
572 list_for_each_entry(n, &ctx->names_list, list) {
573 if (audit_comparator(MAJOR(n->dev), f->op, f->val) ||
574 audit_comparator(MAJOR(n->rdev), f->op, f->val)) {
575 ++result;
576 break;
577 }
578 }
579 }
580 break;
581 case AUDIT_DEVMINOR:
582 if (name) {
583 if (audit_comparator(MINOR(name->dev), f->op, f->val) ||
584 audit_comparator(MINOR(name->rdev), f->op, f->val))
585 ++result;
586 } else if (ctx) {
587 list_for_each_entry(n, &ctx->names_list, list) {
588 if (audit_comparator(MINOR(n->dev), f->op, f->val) ||
589 audit_comparator(MINOR(n->rdev), f->op, f->val)) {
590 ++result;
591 break;
592 }
593 }
594 }
595 break;
596 case AUDIT_INODE:
597 if (name)
598 result = audit_comparator(name->ino, f->op, f->val);
599 else if (ctx) {
600 list_for_each_entry(n, &ctx->names_list, list) {
601 if (audit_comparator(n->ino, f->op, f->val)) {
602 ++result;
603 break;
604 }
605 }
606 }
607 break;
608 case AUDIT_OBJ_UID:
609 if (name) {
610 result = audit_uid_comparator(name->uid, f->op, f->uid);
611 } else if (ctx) {
612 list_for_each_entry(n, &ctx->names_list, list) {
613 if (audit_uid_comparator(n->uid, f->op, f->uid)) {
614 ++result;
615 break;
616 }
617 }
618 }
619 break;
620 case AUDIT_OBJ_GID:
621 if (name) {
622 result = audit_gid_comparator(name->gid, f->op, f->gid);
623 } else if (ctx) {
624 list_for_each_entry(n, &ctx->names_list, list) {
625 if (audit_gid_comparator(n->gid, f->op, f->gid)) {
626 ++result;
627 break;
628 }
629 }
630 }
631 break;
632 case AUDIT_WATCH:
633 if (name) {
634 result = audit_watch_compare(rule->watch,
635 name->ino,
636 name->dev);
637 if (f->op == Audit_not_equal)
638 result = !result;
639 }
640 break;
641 case AUDIT_DIR:
642 if (ctx) {
643 result = match_tree_refs(ctx, rule->tree);
644 if (f->op == Audit_not_equal)
645 result = !result;
646 }
647 break;
648 case AUDIT_LOGINUID:
649 result = audit_uid_comparator(audit_get_loginuid(tsk),
650 f->op, f->uid);
651 break;
652 case AUDIT_LOGINUID_SET:
653 result = audit_comparator(audit_loginuid_set(tsk), f->op, f->val);
654 break;
655 case AUDIT_SADDR_FAM:
656 if (ctx && ctx->sockaddr)
657 result = audit_comparator(ctx->sockaddr->ss_family,
658 f->op, f->val);
659 break;
660 case AUDIT_SUBJ_USER:
661 case AUDIT_SUBJ_ROLE:
662 case AUDIT_SUBJ_TYPE:
663 case AUDIT_SUBJ_SEN:
664 case AUDIT_SUBJ_CLR:
665 /* NOTE: this may return negative values indicating
666 a temporary error. We simply treat this as a
667 match for now to avoid losing information that
668 may be wanted. An error message will also be
669 logged upon error */
670 if (f->lsm_rule) {
671 if (need_sid) {
672 /* @tsk should always be equal to
673 * @current with the exception of
674 * fork()/copy_process() in which case
675 * the new @tsk creds are still a dup
676 * of @current's creds so we can still
677 * use
678 * security_current_getlsmprop_subj()
679 * here even though it always refs
680 * @current's creds
681 */
682 security_current_getlsmprop_subj(&prop);
683 need_sid = 0;
684 }
685 result = security_audit_rule_match(&prop,
686 f->type,
687 f->op,
688 f->lsm_rule);
689 }
690 break;
691 case AUDIT_OBJ_USER:
692 case AUDIT_OBJ_ROLE:
693 case AUDIT_OBJ_TYPE:
694 case AUDIT_OBJ_LEV_LOW:
695 case AUDIT_OBJ_LEV_HIGH:
696 /* The above note for AUDIT_SUBJ_USER...AUDIT_SUBJ_CLR
697 also applies here */
698 if (f->lsm_rule) {
699 /* Find files that match */
700 if (name) {
701 result = security_audit_rule_match(
702 &name->oprop,
703 f->type,
704 f->op,
705 f->lsm_rule);
706 } else if (ctx) {
707 list_for_each_entry(n, &ctx->names_list, list) {
708 if (security_audit_rule_match(
709 &n->oprop,
710 f->type,
711 f->op,
712 f->lsm_rule)) {
713 ++result;
714 break;
715 }
716 }
717 }
718 /* Find ipc objects that match */
719 if (!ctx || ctx->type != AUDIT_IPC)
720 break;
721 if (security_audit_rule_match(&ctx->ipc.oprop,
722 f->type, f->op,
723 f->lsm_rule))
724 ++result;
725 }
726 break;
727 case AUDIT_ARG0:
728 case AUDIT_ARG1:
729 case AUDIT_ARG2:
730 case AUDIT_ARG3:
731 if (ctx)
732 result = audit_comparator(ctx->argv[f->type-AUDIT_ARG0], f->op, f->val);
733 break;
734 case AUDIT_FILTERKEY:
735 /* ignore this field for filtering */
736 result = 1;
737 break;
738 case AUDIT_PERM:
739 result = audit_match_perm(ctx, f->val);
740 if (f->op == Audit_not_equal)
741 result = !result;
742 break;
743 case AUDIT_FILETYPE:
744 result = audit_match_filetype(ctx, f->val);
745 if (f->op == Audit_not_equal)
746 result = !result;
747 break;
748 case AUDIT_FIELD_COMPARE:
749 result = audit_field_compare(tsk, cred, f, ctx, name);
750 break;
751 }
752 if (!result)
753 return 0;
754 }
755
756 if (ctx) {
757 if (rule->filterkey) {
758 kfree(ctx->filterkey);
759 ctx->filterkey = kstrdup(rule->filterkey, GFP_ATOMIC);
760 }
761 ctx->prio = rule->prio;
762 }
763 switch (rule->action) {
764 case AUDIT_NEVER:
765 *state = AUDIT_STATE_DISABLED;
766 break;
767 case AUDIT_ALWAYS:
768 *state = AUDIT_STATE_RECORD;
769 break;
770 }
771 return 1;
772}
773
774/* At process creation time, we can determine if system-call auditing is
775 * completely disabled for this task. Since we only have the task
776 * structure at this point, we can only check uid and gid.
777 */
778static enum audit_state audit_filter_task(struct task_struct *tsk, char **key)
779{
780 struct audit_entry *e;
781 enum audit_state state;
782
783 rcu_read_lock();
784 list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_TASK], list) {
785 if (audit_filter_rules(tsk, &e->rule, NULL, NULL,
786 &state, true)) {
787 if (state == AUDIT_STATE_RECORD)
788 *key = kstrdup(e->rule.filterkey, GFP_ATOMIC);
789 rcu_read_unlock();
790 return state;
791 }
792 }
793 rcu_read_unlock();
794 return AUDIT_STATE_BUILD;
795}
796
797static int audit_in_mask(const struct audit_krule *rule, unsigned long val)
798{
799 int word, bit;
800
801 if (val > 0xffffffff)
802 return false;
803
804 word = AUDIT_WORD(val);
805 if (word >= AUDIT_BITMASK_SIZE)
806 return false;
807
808 bit = AUDIT_BIT(val);
809
810 return rule->mask[word] & bit;
811}
812
813/**
814 * __audit_filter_op - common filter helper for operations (syscall/uring/etc)
815 * @tsk: associated task
816 * @ctx: audit context
817 * @list: audit filter list
818 * @name: audit_name (can be NULL)
819 * @op: current syscall/uring_op
820 *
821 * Run the udit filters specified in @list against @tsk using @ctx,
822 * @name, and @op, as necessary; the caller is responsible for ensuring
823 * that the call is made while the RCU read lock is held. The @name
824 * parameter can be NULL, but all others must be specified.
825 * Returns 1/true if the filter finds a match, 0/false if none are found.
826 */
827static int __audit_filter_op(struct task_struct *tsk,
828 struct audit_context *ctx,
829 struct list_head *list,
830 struct audit_names *name,
831 unsigned long op)
832{
833 struct audit_entry *e;
834 enum audit_state state;
835
836 list_for_each_entry_rcu(e, list, list) {
837 if (audit_in_mask(&e->rule, op) &&
838 audit_filter_rules(tsk, &e->rule, ctx, name,
839 &state, false)) {
840 ctx->current_state = state;
841 return 1;
842 }
843 }
844 return 0;
845}
846
847/**
848 * audit_filter_uring - apply filters to an io_uring operation
849 * @tsk: associated task
850 * @ctx: audit context
851 */
852static void audit_filter_uring(struct task_struct *tsk,
853 struct audit_context *ctx)
854{
855 if (auditd_test_task(tsk))
856 return;
857
858 rcu_read_lock();
859 __audit_filter_op(tsk, ctx, &audit_filter_list[AUDIT_FILTER_URING_EXIT],
860 NULL, ctx->uring_op);
861 rcu_read_unlock();
862}
863
864/* At syscall exit time, this filter is called if the audit_state is
865 * not low enough that auditing cannot take place, but is also not
866 * high enough that we already know we have to write an audit record
867 * (i.e., the state is AUDIT_STATE_BUILD).
868 */
869static void audit_filter_syscall(struct task_struct *tsk,
870 struct audit_context *ctx)
871{
872 if (auditd_test_task(tsk))
873 return;
874
875 rcu_read_lock();
876 __audit_filter_op(tsk, ctx, &audit_filter_list[AUDIT_FILTER_EXIT],
877 NULL, ctx->major);
878 rcu_read_unlock();
879}
880
881/*
882 * Given an audit_name check the inode hash table to see if they match.
883 * Called holding the rcu read lock to protect the use of audit_inode_hash
884 */
885static int audit_filter_inode_name(struct task_struct *tsk,
886 struct audit_names *n,
887 struct audit_context *ctx)
888{
889 int h = audit_hash_ino((u32)n->ino);
890 struct list_head *list = &audit_inode_hash[h];
891
892 return __audit_filter_op(tsk, ctx, list, n, ctx->major);
893}
894
895/* At syscall exit time, this filter is called if any audit_names have been
896 * collected during syscall processing. We only check rules in sublists at hash
897 * buckets applicable to the inode numbers in audit_names.
898 * Regarding audit_state, same rules apply as for audit_filter_syscall().
899 */
900void audit_filter_inodes(struct task_struct *tsk, struct audit_context *ctx)
901{
902 struct audit_names *n;
903
904 if (auditd_test_task(tsk))
905 return;
906
907 rcu_read_lock();
908
909 list_for_each_entry(n, &ctx->names_list, list) {
910 if (audit_filter_inode_name(tsk, n, ctx))
911 break;
912 }
913 rcu_read_unlock();
914}
915
916static inline void audit_proctitle_free(struct audit_context *context)
917{
918 kfree(context->proctitle.value);
919 context->proctitle.value = NULL;
920 context->proctitle.len = 0;
921}
922
923static inline void audit_free_module(struct audit_context *context)
924{
925 if (context->type == AUDIT_KERN_MODULE) {
926 kfree(context->module.name);
927 context->module.name = NULL;
928 }
929}
930static inline void audit_free_names(struct audit_context *context)
931{
932 struct audit_names *n, *next;
933
934 list_for_each_entry_safe(n, next, &context->names_list, list) {
935 list_del(&n->list);
936 if (n->name)
937 putname(n->name);
938 if (n->should_free)
939 kfree(n);
940 }
941 context->name_count = 0;
942 path_put(&context->pwd);
943 context->pwd.dentry = NULL;
944 context->pwd.mnt = NULL;
945}
946
947static inline void audit_free_aux(struct audit_context *context)
948{
949 struct audit_aux_data *aux;
950
951 while ((aux = context->aux)) {
952 context->aux = aux->next;
953 kfree(aux);
954 }
955 context->aux = NULL;
956 while ((aux = context->aux_pids)) {
957 context->aux_pids = aux->next;
958 kfree(aux);
959 }
960 context->aux_pids = NULL;
961}
962
963/**
964 * audit_reset_context - reset a audit_context structure
965 * @ctx: the audit_context to reset
966 *
967 * All fields in the audit_context will be reset to an initial state, all
968 * references held by fields will be dropped, and private memory will be
969 * released. When this function returns the audit_context will be suitable
970 * for reuse, so long as the passed context is not NULL or a dummy context.
971 */
972static void audit_reset_context(struct audit_context *ctx)
973{
974 if (!ctx)
975 return;
976
977 /* if ctx is non-null, reset the "ctx->context" regardless */
978 ctx->context = AUDIT_CTX_UNUSED;
979 if (ctx->dummy)
980 return;
981
982 /*
983 * NOTE: It shouldn't matter in what order we release the fields, so
984 * release them in the order in which they appear in the struct;
985 * this gives us some hope of quickly making sure we are
986 * resetting the audit_context properly.
987 *
988 * Other things worth mentioning:
989 * - we don't reset "dummy"
990 * - we don't reset "state", we do reset "current_state"
991 * - we preserve "filterkey" if "state" is AUDIT_STATE_RECORD
992 * - much of this is likely overkill, but play it safe for now
993 * - we really need to work on improving the audit_context struct
994 */
995
996 ctx->current_state = ctx->state;
997 ctx->serial = 0;
998 ctx->major = 0;
999 ctx->uring_op = 0;
1000 ctx->ctime = (struct timespec64){ .tv_sec = 0, .tv_nsec = 0 };
1001 memset(ctx->argv, 0, sizeof(ctx->argv));
1002 ctx->return_code = 0;
1003 ctx->prio = (ctx->state == AUDIT_STATE_RECORD ? ~0ULL : 0);
1004 ctx->return_valid = AUDITSC_INVALID;
1005 audit_free_names(ctx);
1006 if (ctx->state != AUDIT_STATE_RECORD) {
1007 kfree(ctx->filterkey);
1008 ctx->filterkey = NULL;
1009 }
1010 audit_free_aux(ctx);
1011 kfree(ctx->sockaddr);
1012 ctx->sockaddr = NULL;
1013 ctx->sockaddr_len = 0;
1014 ctx->ppid = 0;
1015 ctx->uid = ctx->euid = ctx->suid = ctx->fsuid = KUIDT_INIT(0);
1016 ctx->gid = ctx->egid = ctx->sgid = ctx->fsgid = KGIDT_INIT(0);
1017 ctx->personality = 0;
1018 ctx->arch = 0;
1019 ctx->target_pid = 0;
1020 ctx->target_auid = ctx->target_uid = KUIDT_INIT(0);
1021 ctx->target_sessionid = 0;
1022 lsmprop_init(&ctx->target_ref);
1023 ctx->target_comm[0] = '\0';
1024 unroll_tree_refs(ctx, NULL, 0);
1025 WARN_ON(!list_empty(&ctx->killed_trees));
1026 audit_free_module(ctx);
1027 ctx->fds[0] = -1;
1028 ctx->type = 0; /* reset last for audit_free_*() */
1029}
1030
1031static inline struct audit_context *audit_alloc_context(enum audit_state state)
1032{
1033 struct audit_context *context;
1034
1035 context = kzalloc(sizeof(*context), GFP_KERNEL);
1036 if (!context)
1037 return NULL;
1038 context->context = AUDIT_CTX_UNUSED;
1039 context->state = state;
1040 context->prio = state == AUDIT_STATE_RECORD ? ~0ULL : 0;
1041 INIT_LIST_HEAD(&context->killed_trees);
1042 INIT_LIST_HEAD(&context->names_list);
1043 context->fds[0] = -1;
1044 context->return_valid = AUDITSC_INVALID;
1045 return context;
1046}
1047
1048/**
1049 * audit_alloc - allocate an audit context block for a task
1050 * @tsk: task
1051 *
1052 * Filter on the task information and allocate a per-task audit context
1053 * if necessary. Doing so turns on system call auditing for the
1054 * specified task. This is called from copy_process, so no lock is
1055 * needed.
1056 */
1057int audit_alloc(struct task_struct *tsk)
1058{
1059 struct audit_context *context;
1060 enum audit_state state;
1061 char *key = NULL;
1062
1063 if (likely(!audit_ever_enabled))
1064 return 0;
1065
1066 state = audit_filter_task(tsk, &key);
1067 if (state == AUDIT_STATE_DISABLED) {
1068 clear_task_syscall_work(tsk, SYSCALL_AUDIT);
1069 return 0;
1070 }
1071
1072 context = audit_alloc_context(state);
1073 if (!context) {
1074 kfree(key);
1075 audit_log_lost("out of memory in audit_alloc");
1076 return -ENOMEM;
1077 }
1078 context->filterkey = key;
1079
1080 audit_set_context(tsk, context);
1081 set_task_syscall_work(tsk, SYSCALL_AUDIT);
1082 return 0;
1083}
1084
1085static inline void audit_free_context(struct audit_context *context)
1086{
1087 /* resetting is extra work, but it is likely just noise */
1088 audit_reset_context(context);
1089 audit_proctitle_free(context);
1090 free_tree_refs(context);
1091 kfree(context->filterkey);
1092 kfree(context);
1093}
1094
1095static int audit_log_pid_context(struct audit_context *context, pid_t pid,
1096 kuid_t auid, kuid_t uid,
1097 unsigned int sessionid, struct lsm_prop *prop,
1098 char *comm)
1099{
1100 struct audit_buffer *ab;
1101 char *ctx = NULL;
1102 u32 len;
1103 int rc = 0;
1104
1105 ab = audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID);
1106 if (!ab)
1107 return rc;
1108
1109 audit_log_format(ab, "opid=%d oauid=%d ouid=%d oses=%d", pid,
1110 from_kuid(&init_user_ns, auid),
1111 from_kuid(&init_user_ns, uid), sessionid);
1112 if (lsmprop_is_set(prop)) {
1113 if (security_lsmprop_to_secctx(prop, &ctx, &len)) {
1114 audit_log_format(ab, " obj=(none)");
1115 rc = 1;
1116 } else {
1117 audit_log_format(ab, " obj=%s", ctx);
1118 security_release_secctx(ctx, len);
1119 }
1120 }
1121 audit_log_format(ab, " ocomm=");
1122 audit_log_untrustedstring(ab, comm);
1123 audit_log_end(ab);
1124
1125 return rc;
1126}
1127
1128static void audit_log_execve_info(struct audit_context *context,
1129 struct audit_buffer **ab)
1130{
1131 long len_max;
1132 long len_rem;
1133 long len_full;
1134 long len_buf;
1135 long len_abuf = 0;
1136 long len_tmp;
1137 bool require_data;
1138 bool encode;
1139 unsigned int iter;
1140 unsigned int arg;
1141 char *buf_head;
1142 char *buf;
1143 const char __user *p = (const char __user *)current->mm->arg_start;
1144
1145 /* NOTE: this buffer needs to be large enough to hold all the non-arg
1146 * data we put in the audit record for this argument (see the
1147 * code below) ... at this point in time 96 is plenty */
1148 char abuf[96];
1149
1150 /* NOTE: we set MAX_EXECVE_AUDIT_LEN to a rather arbitrary limit, the
1151 * current value of 7500 is not as important as the fact that it
1152 * is less than 8k, a setting of 7500 gives us plenty of wiggle
1153 * room if we go over a little bit in the logging below */
1154 WARN_ON_ONCE(MAX_EXECVE_AUDIT_LEN > 7500);
1155 len_max = MAX_EXECVE_AUDIT_LEN;
1156
1157 /* scratch buffer to hold the userspace args */
1158 buf_head = kmalloc(MAX_EXECVE_AUDIT_LEN + 1, GFP_KERNEL);
1159 if (!buf_head) {
1160 audit_panic("out of memory for argv string");
1161 return;
1162 }
1163 buf = buf_head;
1164
1165 audit_log_format(*ab, "argc=%d", context->execve.argc);
1166
1167 len_rem = len_max;
1168 len_buf = 0;
1169 len_full = 0;
1170 require_data = true;
1171 encode = false;
1172 iter = 0;
1173 arg = 0;
1174 do {
1175 /* NOTE: we don't ever want to trust this value for anything
1176 * serious, but the audit record format insists we
1177 * provide an argument length for really long arguments,
1178 * e.g. > MAX_EXECVE_AUDIT_LEN, so we have no choice but
1179 * to use strncpy_from_user() to obtain this value for
1180 * recording in the log, although we don't use it
1181 * anywhere here to avoid a double-fetch problem */
1182 if (len_full == 0)
1183 len_full = strnlen_user(p, MAX_ARG_STRLEN) - 1;
1184
1185 /* read more data from userspace */
1186 if (require_data) {
1187 /* can we make more room in the buffer? */
1188 if (buf != buf_head) {
1189 memmove(buf_head, buf, len_buf);
1190 buf = buf_head;
1191 }
1192
1193 /* fetch as much as we can of the argument */
1194 len_tmp = strncpy_from_user(&buf_head[len_buf], p,
1195 len_max - len_buf);
1196 if (len_tmp == -EFAULT) {
1197 /* unable to copy from userspace */
1198 send_sig(SIGKILL, current, 0);
1199 goto out;
1200 } else if (len_tmp == (len_max - len_buf)) {
1201 /* buffer is not large enough */
1202 require_data = true;
1203 /* NOTE: if we are going to span multiple
1204 * buffers force the encoding so we stand
1205 * a chance at a sane len_full value and
1206 * consistent record encoding */
1207 encode = true;
1208 len_full = len_full * 2;
1209 p += len_tmp;
1210 } else {
1211 require_data = false;
1212 if (!encode)
1213 encode = audit_string_contains_control(
1214 buf, len_tmp);
1215 /* try to use a trusted value for len_full */
1216 if (len_full < len_max)
1217 len_full = (encode ?
1218 len_tmp * 2 : len_tmp);
1219 p += len_tmp + 1;
1220 }
1221 len_buf += len_tmp;
1222 buf_head[len_buf] = '\0';
1223
1224 /* length of the buffer in the audit record? */
1225 len_abuf = (encode ? len_buf * 2 : len_buf + 2);
1226 }
1227
1228 /* write as much as we can to the audit log */
1229 if (len_buf >= 0) {
1230 /* NOTE: some magic numbers here - basically if we
1231 * can't fit a reasonable amount of data into the
1232 * existing audit buffer, flush it and start with
1233 * a new buffer */
1234 if ((sizeof(abuf) + 8) > len_rem) {
1235 len_rem = len_max;
1236 audit_log_end(*ab);
1237 *ab = audit_log_start(context,
1238 GFP_KERNEL, AUDIT_EXECVE);
1239 if (!*ab)
1240 goto out;
1241 }
1242
1243 /* create the non-arg portion of the arg record */
1244 len_tmp = 0;
1245 if (require_data || (iter > 0) ||
1246 ((len_abuf + sizeof(abuf)) > len_rem)) {
1247 if (iter == 0) {
1248 len_tmp += snprintf(&abuf[len_tmp],
1249 sizeof(abuf) - len_tmp,
1250 " a%d_len=%lu",
1251 arg, len_full);
1252 }
1253 len_tmp += snprintf(&abuf[len_tmp],
1254 sizeof(abuf) - len_tmp,
1255 " a%d[%d]=", arg, iter++);
1256 } else
1257 len_tmp += snprintf(&abuf[len_tmp],
1258 sizeof(abuf) - len_tmp,
1259 " a%d=", arg);
1260 WARN_ON(len_tmp >= sizeof(abuf));
1261 abuf[sizeof(abuf) - 1] = '\0';
1262
1263 /* log the arg in the audit record */
1264 audit_log_format(*ab, "%s", abuf);
1265 len_rem -= len_tmp;
1266 len_tmp = len_buf;
1267 if (encode) {
1268 if (len_abuf > len_rem)
1269 len_tmp = len_rem / 2; /* encoding */
1270 audit_log_n_hex(*ab, buf, len_tmp);
1271 len_rem -= len_tmp * 2;
1272 len_abuf -= len_tmp * 2;
1273 } else {
1274 if (len_abuf > len_rem)
1275 len_tmp = len_rem - 2; /* quotes */
1276 audit_log_n_string(*ab, buf, len_tmp);
1277 len_rem -= len_tmp + 2;
1278 /* don't subtract the "2" because we still need
1279 * to add quotes to the remaining string */
1280 len_abuf -= len_tmp;
1281 }
1282 len_buf -= len_tmp;
1283 buf += len_tmp;
1284 }
1285
1286 /* ready to move to the next argument? */
1287 if ((len_buf == 0) && !require_data) {
1288 arg++;
1289 iter = 0;
1290 len_full = 0;
1291 require_data = true;
1292 encode = false;
1293 }
1294 } while (arg < context->execve.argc);
1295
1296 /* NOTE: the caller handles the final audit_log_end() call */
1297
1298out:
1299 kfree(buf_head);
1300}
1301
1302static void audit_log_cap(struct audit_buffer *ab, char *prefix,
1303 kernel_cap_t *cap)
1304{
1305 if (cap_isclear(*cap)) {
1306 audit_log_format(ab, " %s=0", prefix);
1307 return;
1308 }
1309 audit_log_format(ab, " %s=%016llx", prefix, cap->val);
1310}
1311
1312static void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name)
1313{
1314 if (name->fcap_ver == -1) {
1315 audit_log_format(ab, " cap_fe=? cap_fver=? cap_fp=? cap_fi=?");
1316 return;
1317 }
1318 audit_log_cap(ab, "cap_fp", &name->fcap.permitted);
1319 audit_log_cap(ab, "cap_fi", &name->fcap.inheritable);
1320 audit_log_format(ab, " cap_fe=%d cap_fver=%x cap_frootid=%d",
1321 name->fcap.fE, name->fcap_ver,
1322 from_kuid(&init_user_ns, name->fcap.rootid));
1323}
1324
1325static void audit_log_time(struct audit_context *context, struct audit_buffer **ab)
1326{
1327 const struct audit_ntp_data *ntp = &context->time.ntp_data;
1328 const struct timespec64 *tk = &context->time.tk_injoffset;
1329 static const char * const ntp_name[] = {
1330 "offset",
1331 "freq",
1332 "status",
1333 "tai",
1334 "tick",
1335 "adjust",
1336 };
1337 int type;
1338
1339 if (context->type == AUDIT_TIME_ADJNTPVAL) {
1340 for (type = 0; type < AUDIT_NTP_NVALS; type++) {
1341 if (ntp->vals[type].newval != ntp->vals[type].oldval) {
1342 if (!*ab) {
1343 *ab = audit_log_start(context,
1344 GFP_KERNEL,
1345 AUDIT_TIME_ADJNTPVAL);
1346 if (!*ab)
1347 return;
1348 }
1349 audit_log_format(*ab, "op=%s old=%lli new=%lli",
1350 ntp_name[type],
1351 ntp->vals[type].oldval,
1352 ntp->vals[type].newval);
1353 audit_log_end(*ab);
1354 *ab = NULL;
1355 }
1356 }
1357 }
1358 if (tk->tv_sec != 0 || tk->tv_nsec != 0) {
1359 if (!*ab) {
1360 *ab = audit_log_start(context, GFP_KERNEL,
1361 AUDIT_TIME_INJOFFSET);
1362 if (!*ab)
1363 return;
1364 }
1365 audit_log_format(*ab, "sec=%lli nsec=%li",
1366 (long long)tk->tv_sec, tk->tv_nsec);
1367 audit_log_end(*ab);
1368 *ab = NULL;
1369 }
1370}
1371
1372static void show_special(struct audit_context *context, int *call_panic)
1373{
1374 struct audit_buffer *ab;
1375 int i;
1376
1377 ab = audit_log_start(context, GFP_KERNEL, context->type);
1378 if (!ab)
1379 return;
1380
1381 switch (context->type) {
1382 case AUDIT_SOCKETCALL: {
1383 int nargs = context->socketcall.nargs;
1384
1385 audit_log_format(ab, "nargs=%d", nargs);
1386 for (i = 0; i < nargs; i++)
1387 audit_log_format(ab, " a%d=%lx", i,
1388 context->socketcall.args[i]);
1389 break; }
1390 case AUDIT_IPC:
1391 audit_log_format(ab, "ouid=%u ogid=%u mode=%#ho",
1392 from_kuid(&init_user_ns, context->ipc.uid),
1393 from_kgid(&init_user_ns, context->ipc.gid),
1394 context->ipc.mode);
1395 if (lsmprop_is_set(&context->ipc.oprop)) {
1396 char *ctx = NULL;
1397 u32 len;
1398
1399 if (security_lsmprop_to_secctx(&context->ipc.oprop,
1400 &ctx, &len)) {
1401 *call_panic = 1;
1402 } else {
1403 audit_log_format(ab, " obj=%s", ctx);
1404 security_release_secctx(ctx, len);
1405 }
1406 }
1407 if (context->ipc.has_perm) {
1408 audit_log_end(ab);
1409 ab = audit_log_start(context, GFP_KERNEL,
1410 AUDIT_IPC_SET_PERM);
1411 if (unlikely(!ab))
1412 return;
1413 audit_log_format(ab,
1414 "qbytes=%lx ouid=%u ogid=%u mode=%#ho",
1415 context->ipc.qbytes,
1416 context->ipc.perm_uid,
1417 context->ipc.perm_gid,
1418 context->ipc.perm_mode);
1419 }
1420 break;
1421 case AUDIT_MQ_OPEN:
1422 audit_log_format(ab,
1423 "oflag=0x%x mode=%#ho mq_flags=0x%lx mq_maxmsg=%ld "
1424 "mq_msgsize=%ld mq_curmsgs=%ld",
1425 context->mq_open.oflag, context->mq_open.mode,
1426 context->mq_open.attr.mq_flags,
1427 context->mq_open.attr.mq_maxmsg,
1428 context->mq_open.attr.mq_msgsize,
1429 context->mq_open.attr.mq_curmsgs);
1430 break;
1431 case AUDIT_MQ_SENDRECV:
1432 audit_log_format(ab,
1433 "mqdes=%d msg_len=%zd msg_prio=%u "
1434 "abs_timeout_sec=%lld abs_timeout_nsec=%ld",
1435 context->mq_sendrecv.mqdes,
1436 context->mq_sendrecv.msg_len,
1437 context->mq_sendrecv.msg_prio,
1438 (long long) context->mq_sendrecv.abs_timeout.tv_sec,
1439 context->mq_sendrecv.abs_timeout.tv_nsec);
1440 break;
1441 case AUDIT_MQ_NOTIFY:
1442 audit_log_format(ab, "mqdes=%d sigev_signo=%d",
1443 context->mq_notify.mqdes,
1444 context->mq_notify.sigev_signo);
1445 break;
1446 case AUDIT_MQ_GETSETATTR: {
1447 struct mq_attr *attr = &context->mq_getsetattr.mqstat;
1448
1449 audit_log_format(ab,
1450 "mqdes=%d mq_flags=0x%lx mq_maxmsg=%ld mq_msgsize=%ld "
1451 "mq_curmsgs=%ld ",
1452 context->mq_getsetattr.mqdes,
1453 attr->mq_flags, attr->mq_maxmsg,
1454 attr->mq_msgsize, attr->mq_curmsgs);
1455 break; }
1456 case AUDIT_CAPSET:
1457 audit_log_format(ab, "pid=%d", context->capset.pid);
1458 audit_log_cap(ab, "cap_pi", &context->capset.cap.inheritable);
1459 audit_log_cap(ab, "cap_pp", &context->capset.cap.permitted);
1460 audit_log_cap(ab, "cap_pe", &context->capset.cap.effective);
1461 audit_log_cap(ab, "cap_pa", &context->capset.cap.ambient);
1462 break;
1463 case AUDIT_MMAP:
1464 audit_log_format(ab, "fd=%d flags=0x%x", context->mmap.fd,
1465 context->mmap.flags);
1466 break;
1467 case AUDIT_OPENAT2:
1468 audit_log_format(ab, "oflag=0%llo mode=0%llo resolve=0x%llx",
1469 context->openat2.flags,
1470 context->openat2.mode,
1471 context->openat2.resolve);
1472 break;
1473 case AUDIT_EXECVE:
1474 audit_log_execve_info(context, &ab);
1475 break;
1476 case AUDIT_KERN_MODULE:
1477 audit_log_format(ab, "name=");
1478 if (context->module.name) {
1479 audit_log_untrustedstring(ab, context->module.name);
1480 } else
1481 audit_log_format(ab, "(null)");
1482
1483 break;
1484 case AUDIT_TIME_ADJNTPVAL:
1485 case AUDIT_TIME_INJOFFSET:
1486 /* this call deviates from the rest, eating the buffer */
1487 audit_log_time(context, &ab);
1488 break;
1489 }
1490 audit_log_end(ab);
1491}
1492
1493static inline int audit_proctitle_rtrim(char *proctitle, int len)
1494{
1495 char *end = proctitle + len - 1;
1496
1497 while (end > proctitle && !isprint(*end))
1498 end--;
1499
1500 /* catch the case where proctitle is only 1 non-print character */
1501 len = end - proctitle + 1;
1502 len -= isprint(proctitle[len-1]) == 0;
1503 return len;
1504}
1505
1506/*
1507 * audit_log_name - produce AUDIT_PATH record from struct audit_names
1508 * @context: audit_context for the task
1509 * @n: audit_names structure with reportable details
1510 * @path: optional path to report instead of audit_names->name
1511 * @record_num: record number to report when handling a list of names
1512 * @call_panic: optional pointer to int that will be updated if secid fails
1513 */
1514static void audit_log_name(struct audit_context *context, struct audit_names *n,
1515 const struct path *path, int record_num, int *call_panic)
1516{
1517 struct audit_buffer *ab;
1518
1519 ab = audit_log_start(context, GFP_KERNEL, AUDIT_PATH);
1520 if (!ab)
1521 return;
1522
1523 audit_log_format(ab, "item=%d", record_num);
1524
1525 if (path)
1526 audit_log_d_path(ab, " name=", path);
1527 else if (n->name) {
1528 switch (n->name_len) {
1529 case AUDIT_NAME_FULL:
1530 /* log the full path */
1531 audit_log_format(ab, " name=");
1532 audit_log_untrustedstring(ab, n->name->name);
1533 break;
1534 case 0:
1535 /* name was specified as a relative path and the
1536 * directory component is the cwd
1537 */
1538 if (context->pwd.dentry && context->pwd.mnt)
1539 audit_log_d_path(ab, " name=", &context->pwd);
1540 else
1541 audit_log_format(ab, " name=(null)");
1542 break;
1543 default:
1544 /* log the name's directory component */
1545 audit_log_format(ab, " name=");
1546 audit_log_n_untrustedstring(ab, n->name->name,
1547 n->name_len);
1548 }
1549 } else
1550 audit_log_format(ab, " name=(null)");
1551
1552 if (n->ino != AUDIT_INO_UNSET)
1553 audit_log_format(ab, " inode=%lu dev=%02x:%02x mode=%#ho ouid=%u ogid=%u rdev=%02x:%02x",
1554 n->ino,
1555 MAJOR(n->dev),
1556 MINOR(n->dev),
1557 n->mode,
1558 from_kuid(&init_user_ns, n->uid),
1559 from_kgid(&init_user_ns, n->gid),
1560 MAJOR(n->rdev),
1561 MINOR(n->rdev));
1562 if (lsmprop_is_set(&n->oprop)) {
1563 char *ctx = NULL;
1564 u32 len;
1565
1566 if (security_lsmprop_to_secctx(&n->oprop, &ctx, &len)) {
1567 if (call_panic)
1568 *call_panic = 2;
1569 } else {
1570 audit_log_format(ab, " obj=%s", ctx);
1571 security_release_secctx(ctx, len);
1572 }
1573 }
1574
1575 /* log the audit_names record type */
1576 switch (n->type) {
1577 case AUDIT_TYPE_NORMAL:
1578 audit_log_format(ab, " nametype=NORMAL");
1579 break;
1580 case AUDIT_TYPE_PARENT:
1581 audit_log_format(ab, " nametype=PARENT");
1582 break;
1583 case AUDIT_TYPE_CHILD_DELETE:
1584 audit_log_format(ab, " nametype=DELETE");
1585 break;
1586 case AUDIT_TYPE_CHILD_CREATE:
1587 audit_log_format(ab, " nametype=CREATE");
1588 break;
1589 default:
1590 audit_log_format(ab, " nametype=UNKNOWN");
1591 break;
1592 }
1593
1594 audit_log_fcaps(ab, n);
1595 audit_log_end(ab);
1596}
1597
1598static void audit_log_proctitle(void)
1599{
1600 int res;
1601 char *buf;
1602 char *msg = "(null)";
1603 int len = strlen(msg);
1604 struct audit_context *context = audit_context();
1605 struct audit_buffer *ab;
1606
1607 ab = audit_log_start(context, GFP_KERNEL, AUDIT_PROCTITLE);
1608 if (!ab)
1609 return; /* audit_panic or being filtered */
1610
1611 audit_log_format(ab, "proctitle=");
1612
1613 /* Not cached */
1614 if (!context->proctitle.value) {
1615 buf = kmalloc(MAX_PROCTITLE_AUDIT_LEN, GFP_KERNEL);
1616 if (!buf)
1617 goto out;
1618 /* Historically called this from procfs naming */
1619 res = get_cmdline(current, buf, MAX_PROCTITLE_AUDIT_LEN);
1620 if (res == 0) {
1621 kfree(buf);
1622 goto out;
1623 }
1624 res = audit_proctitle_rtrim(buf, res);
1625 if (res == 0) {
1626 kfree(buf);
1627 goto out;
1628 }
1629 context->proctitle.value = buf;
1630 context->proctitle.len = res;
1631 }
1632 msg = context->proctitle.value;
1633 len = context->proctitle.len;
1634out:
1635 audit_log_n_untrustedstring(ab, msg, len);
1636 audit_log_end(ab);
1637}
1638
1639/**
1640 * audit_log_uring - generate a AUDIT_URINGOP record
1641 * @ctx: the audit context
1642 */
1643static void audit_log_uring(struct audit_context *ctx)
1644{
1645 struct audit_buffer *ab;
1646 const struct cred *cred;
1647
1648 ab = audit_log_start(ctx, GFP_ATOMIC, AUDIT_URINGOP);
1649 if (!ab)
1650 return;
1651 cred = current_cred();
1652 audit_log_format(ab, "uring_op=%d", ctx->uring_op);
1653 if (ctx->return_valid != AUDITSC_INVALID)
1654 audit_log_format(ab, " success=%s exit=%ld",
1655 str_yes_no(ctx->return_valid ==
1656 AUDITSC_SUCCESS),
1657 ctx->return_code);
1658 audit_log_format(ab,
1659 " items=%d"
1660 " ppid=%d pid=%d uid=%u gid=%u euid=%u suid=%u"
1661 " fsuid=%u egid=%u sgid=%u fsgid=%u",
1662 ctx->name_count,
1663 task_ppid_nr(current), task_tgid_nr(current),
1664 from_kuid(&init_user_ns, cred->uid),
1665 from_kgid(&init_user_ns, cred->gid),
1666 from_kuid(&init_user_ns, cred->euid),
1667 from_kuid(&init_user_ns, cred->suid),
1668 from_kuid(&init_user_ns, cred->fsuid),
1669 from_kgid(&init_user_ns, cred->egid),
1670 from_kgid(&init_user_ns, cred->sgid),
1671 from_kgid(&init_user_ns, cred->fsgid));
1672 audit_log_task_context(ab);
1673 audit_log_key(ab, ctx->filterkey);
1674 audit_log_end(ab);
1675}
1676
1677static void audit_log_exit(void)
1678{
1679 int i, call_panic = 0;
1680 struct audit_context *context = audit_context();
1681 struct audit_buffer *ab;
1682 struct audit_aux_data *aux;
1683 struct audit_names *n;
1684
1685 context->personality = current->personality;
1686
1687 switch (context->context) {
1688 case AUDIT_CTX_SYSCALL:
1689 ab = audit_log_start(context, GFP_KERNEL, AUDIT_SYSCALL);
1690 if (!ab)
1691 return;
1692 audit_log_format(ab, "arch=%x syscall=%d",
1693 context->arch, context->major);
1694 if (context->personality != PER_LINUX)
1695 audit_log_format(ab, " per=%lx", context->personality);
1696 if (context->return_valid != AUDITSC_INVALID)
1697 audit_log_format(ab, " success=%s exit=%ld",
1698 str_yes_no(context->return_valid ==
1699 AUDITSC_SUCCESS),
1700 context->return_code);
1701 audit_log_format(ab,
1702 " a0=%lx a1=%lx a2=%lx a3=%lx items=%d",
1703 context->argv[0],
1704 context->argv[1],
1705 context->argv[2],
1706 context->argv[3],
1707 context->name_count);
1708 audit_log_task_info(ab);
1709 audit_log_key(ab, context->filterkey);
1710 audit_log_end(ab);
1711 break;
1712 case AUDIT_CTX_URING:
1713 audit_log_uring(context);
1714 break;
1715 default:
1716 BUG();
1717 break;
1718 }
1719
1720 for (aux = context->aux; aux; aux = aux->next) {
1721
1722 ab = audit_log_start(context, GFP_KERNEL, aux->type);
1723 if (!ab)
1724 continue; /* audit_panic has been called */
1725
1726 switch (aux->type) {
1727
1728 case AUDIT_BPRM_FCAPS: {
1729 struct audit_aux_data_bprm_fcaps *axs = (void *)aux;
1730
1731 audit_log_format(ab, "fver=%x", axs->fcap_ver);
1732 audit_log_cap(ab, "fp", &axs->fcap.permitted);
1733 audit_log_cap(ab, "fi", &axs->fcap.inheritable);
1734 audit_log_format(ab, " fe=%d", axs->fcap.fE);
1735 audit_log_cap(ab, "old_pp", &axs->old_pcap.permitted);
1736 audit_log_cap(ab, "old_pi", &axs->old_pcap.inheritable);
1737 audit_log_cap(ab, "old_pe", &axs->old_pcap.effective);
1738 audit_log_cap(ab, "old_pa", &axs->old_pcap.ambient);
1739 audit_log_cap(ab, "pp", &axs->new_pcap.permitted);
1740 audit_log_cap(ab, "pi", &axs->new_pcap.inheritable);
1741 audit_log_cap(ab, "pe", &axs->new_pcap.effective);
1742 audit_log_cap(ab, "pa", &axs->new_pcap.ambient);
1743 audit_log_format(ab, " frootid=%d",
1744 from_kuid(&init_user_ns,
1745 axs->fcap.rootid));
1746 break; }
1747
1748 }
1749 audit_log_end(ab);
1750 }
1751
1752 if (context->type)
1753 show_special(context, &call_panic);
1754
1755 if (context->fds[0] >= 0) {
1756 ab = audit_log_start(context, GFP_KERNEL, AUDIT_FD_PAIR);
1757 if (ab) {
1758 audit_log_format(ab, "fd0=%d fd1=%d",
1759 context->fds[0], context->fds[1]);
1760 audit_log_end(ab);
1761 }
1762 }
1763
1764 if (context->sockaddr_len) {
1765 ab = audit_log_start(context, GFP_KERNEL, AUDIT_SOCKADDR);
1766 if (ab) {
1767 audit_log_format(ab, "saddr=");
1768 audit_log_n_hex(ab, (void *)context->sockaddr,
1769 context->sockaddr_len);
1770 audit_log_end(ab);
1771 }
1772 }
1773
1774 for (aux = context->aux_pids; aux; aux = aux->next) {
1775 struct audit_aux_data_pids *axs = (void *)aux;
1776
1777 for (i = 0; i < axs->pid_count; i++)
1778 if (audit_log_pid_context(context, axs->target_pid[i],
1779 axs->target_auid[i],
1780 axs->target_uid[i],
1781 axs->target_sessionid[i],
1782 &axs->target_ref[i],
1783 axs->target_comm[i]))
1784 call_panic = 1;
1785 }
1786
1787 if (context->target_pid &&
1788 audit_log_pid_context(context, context->target_pid,
1789 context->target_auid, context->target_uid,
1790 context->target_sessionid,
1791 &context->target_ref, context->target_comm))
1792 call_panic = 1;
1793
1794 if (context->pwd.dentry && context->pwd.mnt) {
1795 ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD);
1796 if (ab) {
1797 audit_log_d_path(ab, "cwd=", &context->pwd);
1798 audit_log_end(ab);
1799 }
1800 }
1801
1802 i = 0;
1803 list_for_each_entry(n, &context->names_list, list) {
1804 if (n->hidden)
1805 continue;
1806 audit_log_name(context, n, NULL, i++, &call_panic);
1807 }
1808
1809 if (context->context == AUDIT_CTX_SYSCALL)
1810 audit_log_proctitle();
1811
1812 /* Send end of event record to help user space know we are finished */
1813 ab = audit_log_start(context, GFP_KERNEL, AUDIT_EOE);
1814 if (ab)
1815 audit_log_end(ab);
1816 if (call_panic)
1817 audit_panic("error in audit_log_exit()");
1818}
1819
1820/**
1821 * __audit_free - free a per-task audit context
1822 * @tsk: task whose audit context block to free
1823 *
1824 * Called from copy_process, do_exit, and the io_uring code
1825 */
1826void __audit_free(struct task_struct *tsk)
1827{
1828 struct audit_context *context = tsk->audit_context;
1829
1830 if (!context)
1831 return;
1832
1833 /* this may generate CONFIG_CHANGE records */
1834 if (!list_empty(&context->killed_trees))
1835 audit_kill_trees(context);
1836
1837 /* We are called either by do_exit() or the fork() error handling code;
1838 * in the former case tsk == current and in the latter tsk is a
1839 * random task_struct that doesn't have any meaningful data we
1840 * need to log via audit_log_exit().
1841 */
1842 if (tsk == current && !context->dummy) {
1843 context->return_valid = AUDITSC_INVALID;
1844 context->return_code = 0;
1845 if (context->context == AUDIT_CTX_SYSCALL) {
1846 audit_filter_syscall(tsk, context);
1847 audit_filter_inodes(tsk, context);
1848 if (context->current_state == AUDIT_STATE_RECORD)
1849 audit_log_exit();
1850 } else if (context->context == AUDIT_CTX_URING) {
1851 /* TODO: verify this case is real and valid */
1852 audit_filter_uring(tsk, context);
1853 audit_filter_inodes(tsk, context);
1854 if (context->current_state == AUDIT_STATE_RECORD)
1855 audit_log_uring(context);
1856 }
1857 }
1858
1859 audit_set_context(tsk, NULL);
1860 audit_free_context(context);
1861}
1862
1863/**
1864 * audit_return_fixup - fixup the return codes in the audit_context
1865 * @ctx: the audit_context
1866 * @success: true/false value to indicate if the operation succeeded or not
1867 * @code: operation return code
1868 *
1869 * We need to fixup the return code in the audit logs if the actual return
1870 * codes are later going to be fixed by the arch specific signal handlers.
1871 */
1872static void audit_return_fixup(struct audit_context *ctx,
1873 int success, long code)
1874{
1875 /*
1876 * This is actually a test for:
1877 * (rc == ERESTARTSYS ) || (rc == ERESTARTNOINTR) ||
1878 * (rc == ERESTARTNOHAND) || (rc == ERESTART_RESTARTBLOCK)
1879 *
1880 * but is faster than a bunch of ||
1881 */
1882 if (unlikely(code <= -ERESTARTSYS) &&
1883 (code >= -ERESTART_RESTARTBLOCK) &&
1884 (code != -ENOIOCTLCMD))
1885 ctx->return_code = -EINTR;
1886 else
1887 ctx->return_code = code;
1888 ctx->return_valid = (success ? AUDITSC_SUCCESS : AUDITSC_FAILURE);
1889}
1890
1891/**
1892 * __audit_uring_entry - prepare the kernel task's audit context for io_uring
1893 * @op: the io_uring opcode
1894 *
1895 * This is similar to audit_syscall_entry() but is intended for use by io_uring
1896 * operations. This function should only ever be called from
1897 * audit_uring_entry() as we rely on the audit context checking present in that
1898 * function.
1899 */
1900void __audit_uring_entry(u8 op)
1901{
1902 struct audit_context *ctx = audit_context();
1903
1904 if (ctx->state == AUDIT_STATE_DISABLED)
1905 return;
1906
1907 /*
1908 * NOTE: It's possible that we can be called from the process' context
1909 * before it returns to userspace, and before audit_syscall_exit()
1910 * is called. In this case there is not much to do, just record
1911 * the io_uring details and return.
1912 */
1913 ctx->uring_op = op;
1914 if (ctx->context == AUDIT_CTX_SYSCALL)
1915 return;
1916
1917 ctx->dummy = !audit_n_rules;
1918 if (!ctx->dummy && ctx->state == AUDIT_STATE_BUILD)
1919 ctx->prio = 0;
1920
1921 ctx->context = AUDIT_CTX_URING;
1922 ctx->current_state = ctx->state;
1923 ktime_get_coarse_real_ts64(&ctx->ctime);
1924}
1925
1926/**
1927 * __audit_uring_exit - wrap up the kernel task's audit context after io_uring
1928 * @success: true/false value to indicate if the operation succeeded or not
1929 * @code: operation return code
1930 *
1931 * This is similar to audit_syscall_exit() but is intended for use by io_uring
1932 * operations. This function should only ever be called from
1933 * audit_uring_exit() as we rely on the audit context checking present in that
1934 * function.
1935 */
1936void __audit_uring_exit(int success, long code)
1937{
1938 struct audit_context *ctx = audit_context();
1939
1940 if (ctx->dummy) {
1941 if (ctx->context != AUDIT_CTX_URING)
1942 return;
1943 goto out;
1944 }
1945
1946 audit_return_fixup(ctx, success, code);
1947 if (ctx->context == AUDIT_CTX_SYSCALL) {
1948 /*
1949 * NOTE: See the note in __audit_uring_entry() about the case
1950 * where we may be called from process context before we
1951 * return to userspace via audit_syscall_exit(). In this
1952 * case we simply emit a URINGOP record and bail, the
1953 * normal syscall exit handling will take care of
1954 * everything else.
1955 * It is also worth mentioning that when we are called,
1956 * the current process creds may differ from the creds
1957 * used during the normal syscall processing; keep that
1958 * in mind if/when we move the record generation code.
1959 */
1960
1961 /*
1962 * We need to filter on the syscall info here to decide if we
1963 * should emit a URINGOP record. I know it seems odd but this
1964 * solves the problem where users have a filter to block *all*
1965 * syscall records in the "exit" filter; we want to preserve
1966 * the behavior here.
1967 */
1968 audit_filter_syscall(current, ctx);
1969 if (ctx->current_state != AUDIT_STATE_RECORD)
1970 audit_filter_uring(current, ctx);
1971 audit_filter_inodes(current, ctx);
1972 if (ctx->current_state != AUDIT_STATE_RECORD)
1973 return;
1974
1975 audit_log_uring(ctx);
1976 return;
1977 }
1978
1979 /* this may generate CONFIG_CHANGE records */
1980 if (!list_empty(&ctx->killed_trees))
1981 audit_kill_trees(ctx);
1982
1983 /* run through both filters to ensure we set the filterkey properly */
1984 audit_filter_uring(current, ctx);
1985 audit_filter_inodes(current, ctx);
1986 if (ctx->current_state != AUDIT_STATE_RECORD)
1987 goto out;
1988 audit_log_exit();
1989
1990out:
1991 audit_reset_context(ctx);
1992}
1993
1994/**
1995 * __audit_syscall_entry - fill in an audit record at syscall entry
1996 * @major: major syscall type (function)
1997 * @a1: additional syscall register 1
1998 * @a2: additional syscall register 2
1999 * @a3: additional syscall register 3
2000 * @a4: additional syscall register 4
2001 *
2002 * Fill in audit context at syscall entry. This only happens if the
2003 * audit context was created when the task was created and the state or
2004 * filters demand the audit context be built. If the state from the
2005 * per-task filter or from the per-syscall filter is AUDIT_STATE_RECORD,
2006 * then the record will be written at syscall exit time (otherwise, it
2007 * will only be written if another part of the kernel requests that it
2008 * be written).
2009 */
2010void __audit_syscall_entry(int major, unsigned long a1, unsigned long a2,
2011 unsigned long a3, unsigned long a4)
2012{
2013 struct audit_context *context = audit_context();
2014 enum audit_state state;
2015
2016 if (!audit_enabled || !context)
2017 return;
2018
2019 WARN_ON(context->context != AUDIT_CTX_UNUSED);
2020 WARN_ON(context->name_count);
2021 if (context->context != AUDIT_CTX_UNUSED || context->name_count) {
2022 audit_panic("unrecoverable error in audit_syscall_entry()");
2023 return;
2024 }
2025
2026 state = context->state;
2027 if (state == AUDIT_STATE_DISABLED)
2028 return;
2029
2030 context->dummy = !audit_n_rules;
2031 if (!context->dummy && state == AUDIT_STATE_BUILD) {
2032 context->prio = 0;
2033 if (auditd_test_task(current))
2034 return;
2035 }
2036
2037 context->arch = syscall_get_arch(current);
2038 context->major = major;
2039 context->argv[0] = a1;
2040 context->argv[1] = a2;
2041 context->argv[2] = a3;
2042 context->argv[3] = a4;
2043 context->context = AUDIT_CTX_SYSCALL;
2044 context->current_state = state;
2045 ktime_get_coarse_real_ts64(&context->ctime);
2046}
2047
2048/**
2049 * __audit_syscall_exit - deallocate audit context after a system call
2050 * @success: success value of the syscall
2051 * @return_code: return value of the syscall
2052 *
2053 * Tear down after system call. If the audit context has been marked as
2054 * auditable (either because of the AUDIT_STATE_RECORD state from
2055 * filtering, or because some other part of the kernel wrote an audit
2056 * message), then write out the syscall information. In call cases,
2057 * free the names stored from getname().
2058 */
2059void __audit_syscall_exit(int success, long return_code)
2060{
2061 struct audit_context *context = audit_context();
2062
2063 if (!context || context->dummy ||
2064 context->context != AUDIT_CTX_SYSCALL)
2065 goto out;
2066
2067 /* this may generate CONFIG_CHANGE records */
2068 if (!list_empty(&context->killed_trees))
2069 audit_kill_trees(context);
2070
2071 audit_return_fixup(context, success, return_code);
2072 /* run through both filters to ensure we set the filterkey properly */
2073 audit_filter_syscall(current, context);
2074 audit_filter_inodes(current, context);
2075 if (context->current_state != AUDIT_STATE_RECORD)
2076 goto out;
2077
2078 audit_log_exit();
2079
2080out:
2081 audit_reset_context(context);
2082}
2083
2084static inline void handle_one(const struct inode *inode)
2085{
2086 struct audit_context *context;
2087 struct audit_tree_refs *p;
2088 struct audit_chunk *chunk;
2089 int count;
2090
2091 if (likely(!inode->i_fsnotify_marks))
2092 return;
2093 context = audit_context();
2094 p = context->trees;
2095 count = context->tree_count;
2096 rcu_read_lock();
2097 chunk = audit_tree_lookup(inode);
2098 rcu_read_unlock();
2099 if (!chunk)
2100 return;
2101 if (likely(put_tree_ref(context, chunk)))
2102 return;
2103 if (unlikely(!grow_tree_refs(context))) {
2104 pr_warn("out of memory, audit has lost a tree reference\n");
2105 audit_set_auditable(context);
2106 audit_put_chunk(chunk);
2107 unroll_tree_refs(context, p, count);
2108 return;
2109 }
2110 put_tree_ref(context, chunk);
2111}
2112
2113static void handle_path(const struct dentry *dentry)
2114{
2115 struct audit_context *context;
2116 struct audit_tree_refs *p;
2117 const struct dentry *d, *parent;
2118 struct audit_chunk *drop;
2119 unsigned long seq;
2120 int count;
2121
2122 context = audit_context();
2123 p = context->trees;
2124 count = context->tree_count;
2125retry:
2126 drop = NULL;
2127 d = dentry;
2128 rcu_read_lock();
2129 seq = read_seqbegin(&rename_lock);
2130 for (;;) {
2131 struct inode *inode = d_backing_inode(d);
2132
2133 if (inode && unlikely(inode->i_fsnotify_marks)) {
2134 struct audit_chunk *chunk;
2135
2136 chunk = audit_tree_lookup(inode);
2137 if (chunk) {
2138 if (unlikely(!put_tree_ref(context, chunk))) {
2139 drop = chunk;
2140 break;
2141 }
2142 }
2143 }
2144 parent = d->d_parent;
2145 if (parent == d)
2146 break;
2147 d = parent;
2148 }
2149 if (unlikely(read_seqretry(&rename_lock, seq) || drop)) { /* in this order */
2150 rcu_read_unlock();
2151 if (!drop) {
2152 /* just a race with rename */
2153 unroll_tree_refs(context, p, count);
2154 goto retry;
2155 }
2156 audit_put_chunk(drop);
2157 if (grow_tree_refs(context)) {
2158 /* OK, got more space */
2159 unroll_tree_refs(context, p, count);
2160 goto retry;
2161 }
2162 /* too bad */
2163 pr_warn("out of memory, audit has lost a tree reference\n");
2164 unroll_tree_refs(context, p, count);
2165 audit_set_auditable(context);
2166 return;
2167 }
2168 rcu_read_unlock();
2169}
2170
2171static struct audit_names *audit_alloc_name(struct audit_context *context,
2172 unsigned char type)
2173{
2174 struct audit_names *aname;
2175
2176 if (context->name_count < AUDIT_NAMES) {
2177 aname = &context->preallocated_names[context->name_count];
2178 memset(aname, 0, sizeof(*aname));
2179 } else {
2180 aname = kzalloc(sizeof(*aname), GFP_NOFS);
2181 if (!aname)
2182 return NULL;
2183 aname->should_free = true;
2184 }
2185
2186 aname->ino = AUDIT_INO_UNSET;
2187 aname->type = type;
2188 list_add_tail(&aname->list, &context->names_list);
2189
2190 context->name_count++;
2191 if (!context->pwd.dentry)
2192 get_fs_pwd(current->fs, &context->pwd);
2193 return aname;
2194}
2195
2196/**
2197 * __audit_reusename - fill out filename with info from existing entry
2198 * @uptr: userland ptr to pathname
2199 *
2200 * Search the audit_names list for the current audit context. If there is an
2201 * existing entry with a matching "uptr" then return the filename
2202 * associated with that audit_name. If not, return NULL.
2203 */
2204struct filename *
2205__audit_reusename(const __user char *uptr)
2206{
2207 struct audit_context *context = audit_context();
2208 struct audit_names *n;
2209
2210 list_for_each_entry(n, &context->names_list, list) {
2211 if (!n->name)
2212 continue;
2213 if (n->name->uptr == uptr) {
2214 atomic_inc(&n->name->refcnt);
2215 return n->name;
2216 }
2217 }
2218 return NULL;
2219}
2220
2221/**
2222 * __audit_getname - add a name to the list
2223 * @name: name to add
2224 *
2225 * Add a name to the list of audit names for this context.
2226 * Called from fs/namei.c:getname().
2227 */
2228void __audit_getname(struct filename *name)
2229{
2230 struct audit_context *context = audit_context();
2231 struct audit_names *n;
2232
2233 if (context->context == AUDIT_CTX_UNUSED)
2234 return;
2235
2236 n = audit_alloc_name(context, AUDIT_TYPE_UNKNOWN);
2237 if (!n)
2238 return;
2239
2240 n->name = name;
2241 n->name_len = AUDIT_NAME_FULL;
2242 name->aname = n;
2243 atomic_inc(&name->refcnt);
2244}
2245
2246static inline int audit_copy_fcaps(struct audit_names *name,
2247 const struct dentry *dentry)
2248{
2249 struct cpu_vfs_cap_data caps;
2250 int rc;
2251
2252 if (!dentry)
2253 return 0;
2254
2255 rc = get_vfs_caps_from_disk(&nop_mnt_idmap, dentry, &caps);
2256 if (rc)
2257 return rc;
2258
2259 name->fcap.permitted = caps.permitted;
2260 name->fcap.inheritable = caps.inheritable;
2261 name->fcap.fE = !!(caps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE);
2262 name->fcap.rootid = caps.rootid;
2263 name->fcap_ver = (caps.magic_etc & VFS_CAP_REVISION_MASK) >>
2264 VFS_CAP_REVISION_SHIFT;
2265
2266 return 0;
2267}
2268
2269/* Copy inode data into an audit_names. */
2270static void audit_copy_inode(struct audit_names *name,
2271 const struct dentry *dentry,
2272 struct inode *inode, unsigned int flags)
2273{
2274 name->ino = inode->i_ino;
2275 name->dev = inode->i_sb->s_dev;
2276 name->mode = inode->i_mode;
2277 name->uid = inode->i_uid;
2278 name->gid = inode->i_gid;
2279 name->rdev = inode->i_rdev;
2280 security_inode_getlsmprop(inode, &name->oprop);
2281 if (flags & AUDIT_INODE_NOEVAL) {
2282 name->fcap_ver = -1;
2283 return;
2284 }
2285 audit_copy_fcaps(name, dentry);
2286}
2287
2288/**
2289 * __audit_inode - store the inode and device from a lookup
2290 * @name: name being audited
2291 * @dentry: dentry being audited
2292 * @flags: attributes for this particular entry
2293 */
2294void __audit_inode(struct filename *name, const struct dentry *dentry,
2295 unsigned int flags)
2296{
2297 struct audit_context *context = audit_context();
2298 struct inode *inode = d_backing_inode(dentry);
2299 struct audit_names *n;
2300 bool parent = flags & AUDIT_INODE_PARENT;
2301 struct audit_entry *e;
2302 struct list_head *list = &audit_filter_list[AUDIT_FILTER_FS];
2303 int i;
2304
2305 if (context->context == AUDIT_CTX_UNUSED)
2306 return;
2307
2308 rcu_read_lock();
2309 list_for_each_entry_rcu(e, list, list) {
2310 for (i = 0; i < e->rule.field_count; i++) {
2311 struct audit_field *f = &e->rule.fields[i];
2312
2313 if (f->type == AUDIT_FSTYPE
2314 && audit_comparator(inode->i_sb->s_magic,
2315 f->op, f->val)
2316 && e->rule.action == AUDIT_NEVER) {
2317 rcu_read_unlock();
2318 return;
2319 }
2320 }
2321 }
2322 rcu_read_unlock();
2323
2324 if (!name)
2325 goto out_alloc;
2326
2327 /*
2328 * If we have a pointer to an audit_names entry already, then we can
2329 * just use it directly if the type is correct.
2330 */
2331 n = name->aname;
2332 if (n) {
2333 if (parent) {
2334 if (n->type == AUDIT_TYPE_PARENT ||
2335 n->type == AUDIT_TYPE_UNKNOWN)
2336 goto out;
2337 } else {
2338 if (n->type != AUDIT_TYPE_PARENT)
2339 goto out;
2340 }
2341 }
2342
2343 list_for_each_entry_reverse(n, &context->names_list, list) {
2344 if (n->ino) {
2345 /* valid inode number, use that for the comparison */
2346 if (n->ino != inode->i_ino ||
2347 n->dev != inode->i_sb->s_dev)
2348 continue;
2349 } else if (n->name) {
2350 /* inode number has not been set, check the name */
2351 if (strcmp(n->name->name, name->name))
2352 continue;
2353 } else
2354 /* no inode and no name (?!) ... this is odd ... */
2355 continue;
2356
2357 /* match the correct record type */
2358 if (parent) {
2359 if (n->type == AUDIT_TYPE_PARENT ||
2360 n->type == AUDIT_TYPE_UNKNOWN)
2361 goto out;
2362 } else {
2363 if (n->type != AUDIT_TYPE_PARENT)
2364 goto out;
2365 }
2366 }
2367
2368out_alloc:
2369 /* unable to find an entry with both a matching name and type */
2370 n = audit_alloc_name(context, AUDIT_TYPE_UNKNOWN);
2371 if (!n)
2372 return;
2373 if (name) {
2374 n->name = name;
2375 atomic_inc(&name->refcnt);
2376 }
2377
2378out:
2379 if (parent) {
2380 n->name_len = n->name ? parent_len(n->name->name) : AUDIT_NAME_FULL;
2381 n->type = AUDIT_TYPE_PARENT;
2382 if (flags & AUDIT_INODE_HIDDEN)
2383 n->hidden = true;
2384 } else {
2385 n->name_len = AUDIT_NAME_FULL;
2386 n->type = AUDIT_TYPE_NORMAL;
2387 }
2388 handle_path(dentry);
2389 audit_copy_inode(n, dentry, inode, flags & AUDIT_INODE_NOEVAL);
2390}
2391
2392void __audit_file(const struct file *file)
2393{
2394 __audit_inode(NULL, file->f_path.dentry, 0);
2395}
2396
2397/**
2398 * __audit_inode_child - collect inode info for created/removed objects
2399 * @parent: inode of dentry parent
2400 * @dentry: dentry being audited
2401 * @type: AUDIT_TYPE_* value that we're looking for
2402 *
2403 * For syscalls that create or remove filesystem objects, audit_inode
2404 * can only collect information for the filesystem object's parent.
2405 * This call updates the audit context with the child's information.
2406 * Syscalls that create a new filesystem object must be hooked after
2407 * the object is created. Syscalls that remove a filesystem object
2408 * must be hooked prior, in order to capture the target inode during
2409 * unsuccessful attempts.
2410 */
2411void __audit_inode_child(struct inode *parent,
2412 const struct dentry *dentry,
2413 const unsigned char type)
2414{
2415 struct audit_context *context = audit_context();
2416 struct inode *inode = d_backing_inode(dentry);
2417 const struct qstr *dname = &dentry->d_name;
2418 struct audit_names *n, *found_parent = NULL, *found_child = NULL;
2419 struct audit_entry *e;
2420 struct list_head *list = &audit_filter_list[AUDIT_FILTER_FS];
2421 int i;
2422
2423 if (context->context == AUDIT_CTX_UNUSED)
2424 return;
2425
2426 rcu_read_lock();
2427 list_for_each_entry_rcu(e, list, list) {
2428 for (i = 0; i < e->rule.field_count; i++) {
2429 struct audit_field *f = &e->rule.fields[i];
2430
2431 if (f->type == AUDIT_FSTYPE
2432 && audit_comparator(parent->i_sb->s_magic,
2433 f->op, f->val)
2434 && e->rule.action == AUDIT_NEVER) {
2435 rcu_read_unlock();
2436 return;
2437 }
2438 }
2439 }
2440 rcu_read_unlock();
2441
2442 if (inode)
2443 handle_one(inode);
2444
2445 /* look for a parent entry first */
2446 list_for_each_entry(n, &context->names_list, list) {
2447 if (!n->name ||
2448 (n->type != AUDIT_TYPE_PARENT &&
2449 n->type != AUDIT_TYPE_UNKNOWN))
2450 continue;
2451
2452 if (n->ino == parent->i_ino && n->dev == parent->i_sb->s_dev &&
2453 !audit_compare_dname_path(dname,
2454 n->name->name, n->name_len)) {
2455 if (n->type == AUDIT_TYPE_UNKNOWN)
2456 n->type = AUDIT_TYPE_PARENT;
2457 found_parent = n;
2458 break;
2459 }
2460 }
2461
2462 cond_resched();
2463
2464 /* is there a matching child entry? */
2465 list_for_each_entry(n, &context->names_list, list) {
2466 /* can only match entries that have a name */
2467 if (!n->name ||
2468 (n->type != type && n->type != AUDIT_TYPE_UNKNOWN))
2469 continue;
2470
2471 if (!strcmp(dname->name, n->name->name) ||
2472 !audit_compare_dname_path(dname, n->name->name,
2473 found_parent ?
2474 found_parent->name_len :
2475 AUDIT_NAME_FULL)) {
2476 if (n->type == AUDIT_TYPE_UNKNOWN)
2477 n->type = type;
2478 found_child = n;
2479 break;
2480 }
2481 }
2482
2483 if (!found_parent) {
2484 /* create a new, "anonymous" parent record */
2485 n = audit_alloc_name(context, AUDIT_TYPE_PARENT);
2486 if (!n)
2487 return;
2488 audit_copy_inode(n, NULL, parent, 0);
2489 }
2490
2491 if (!found_child) {
2492 found_child = audit_alloc_name(context, type);
2493 if (!found_child)
2494 return;
2495
2496 /* Re-use the name belonging to the slot for a matching parent
2497 * directory. All names for this context are relinquished in
2498 * audit_free_names() */
2499 if (found_parent) {
2500 found_child->name = found_parent->name;
2501 found_child->name_len = AUDIT_NAME_FULL;
2502 atomic_inc(&found_child->name->refcnt);
2503 }
2504 }
2505
2506 if (inode)
2507 audit_copy_inode(found_child, dentry, inode, 0);
2508 else
2509 found_child->ino = AUDIT_INO_UNSET;
2510}
2511EXPORT_SYMBOL_GPL(__audit_inode_child);
2512
2513/**
2514 * auditsc_get_stamp - get local copies of audit_context values
2515 * @ctx: audit_context for the task
2516 * @t: timespec64 to store time recorded in the audit_context
2517 * @serial: serial value that is recorded in the audit_context
2518 *
2519 * Also sets the context as auditable.
2520 */
2521int auditsc_get_stamp(struct audit_context *ctx,
2522 struct timespec64 *t, unsigned int *serial)
2523{
2524 if (ctx->context == AUDIT_CTX_UNUSED)
2525 return 0;
2526 if (!ctx->serial)
2527 ctx->serial = audit_serial();
2528 t->tv_sec = ctx->ctime.tv_sec;
2529 t->tv_nsec = ctx->ctime.tv_nsec;
2530 *serial = ctx->serial;
2531 if (!ctx->prio) {
2532 ctx->prio = 1;
2533 ctx->current_state = AUDIT_STATE_RECORD;
2534 }
2535 return 1;
2536}
2537
2538/**
2539 * __audit_mq_open - record audit data for a POSIX MQ open
2540 * @oflag: open flag
2541 * @mode: mode bits
2542 * @attr: queue attributes
2543 *
2544 */
2545void __audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr)
2546{
2547 struct audit_context *context = audit_context();
2548
2549 if (attr)
2550 memcpy(&context->mq_open.attr, attr, sizeof(struct mq_attr));
2551 else
2552 memset(&context->mq_open.attr, 0, sizeof(struct mq_attr));
2553
2554 context->mq_open.oflag = oflag;
2555 context->mq_open.mode = mode;
2556
2557 context->type = AUDIT_MQ_OPEN;
2558}
2559
2560/**
2561 * __audit_mq_sendrecv - record audit data for a POSIX MQ timed send/receive
2562 * @mqdes: MQ descriptor
2563 * @msg_len: Message length
2564 * @msg_prio: Message priority
2565 * @abs_timeout: Message timeout in absolute time
2566 *
2567 */
2568void __audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio,
2569 const struct timespec64 *abs_timeout)
2570{
2571 struct audit_context *context = audit_context();
2572 struct timespec64 *p = &context->mq_sendrecv.abs_timeout;
2573
2574 if (abs_timeout)
2575 memcpy(p, abs_timeout, sizeof(*p));
2576 else
2577 memset(p, 0, sizeof(*p));
2578
2579 context->mq_sendrecv.mqdes = mqdes;
2580 context->mq_sendrecv.msg_len = msg_len;
2581 context->mq_sendrecv.msg_prio = msg_prio;
2582
2583 context->type = AUDIT_MQ_SENDRECV;
2584}
2585
2586/**
2587 * __audit_mq_notify - record audit data for a POSIX MQ notify
2588 * @mqdes: MQ descriptor
2589 * @notification: Notification event
2590 *
2591 */
2592
2593void __audit_mq_notify(mqd_t mqdes, const struct sigevent *notification)
2594{
2595 struct audit_context *context = audit_context();
2596
2597 if (notification)
2598 context->mq_notify.sigev_signo = notification->sigev_signo;
2599 else
2600 context->mq_notify.sigev_signo = 0;
2601
2602 context->mq_notify.mqdes = mqdes;
2603 context->type = AUDIT_MQ_NOTIFY;
2604}
2605
2606/**
2607 * __audit_mq_getsetattr - record audit data for a POSIX MQ get/set attribute
2608 * @mqdes: MQ descriptor
2609 * @mqstat: MQ flags
2610 *
2611 */
2612void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
2613{
2614 struct audit_context *context = audit_context();
2615
2616 context->mq_getsetattr.mqdes = mqdes;
2617 context->mq_getsetattr.mqstat = *mqstat;
2618 context->type = AUDIT_MQ_GETSETATTR;
2619}
2620
2621/**
2622 * __audit_ipc_obj - record audit data for ipc object
2623 * @ipcp: ipc permissions
2624 *
2625 */
2626void __audit_ipc_obj(struct kern_ipc_perm *ipcp)
2627{
2628 struct audit_context *context = audit_context();
2629
2630 context->ipc.uid = ipcp->uid;
2631 context->ipc.gid = ipcp->gid;
2632 context->ipc.mode = ipcp->mode;
2633 context->ipc.has_perm = 0;
2634 security_ipc_getlsmprop(ipcp, &context->ipc.oprop);
2635 context->type = AUDIT_IPC;
2636}
2637
2638/**
2639 * __audit_ipc_set_perm - record audit data for new ipc permissions
2640 * @qbytes: msgq bytes
2641 * @uid: msgq user id
2642 * @gid: msgq group id
2643 * @mode: msgq mode (permissions)
2644 *
2645 * Called only after audit_ipc_obj().
2646 */
2647void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode)
2648{
2649 struct audit_context *context = audit_context();
2650
2651 context->ipc.qbytes = qbytes;
2652 context->ipc.perm_uid = uid;
2653 context->ipc.perm_gid = gid;
2654 context->ipc.perm_mode = mode;
2655 context->ipc.has_perm = 1;
2656}
2657
2658void __audit_bprm(struct linux_binprm *bprm)
2659{
2660 struct audit_context *context = audit_context();
2661
2662 context->type = AUDIT_EXECVE;
2663 context->execve.argc = bprm->argc;
2664}
2665
2666
2667/**
2668 * __audit_socketcall - record audit data for sys_socketcall
2669 * @nargs: number of args, which should not be more than AUDITSC_ARGS.
2670 * @args: args array
2671 *
2672 */
2673int __audit_socketcall(int nargs, unsigned long *args)
2674{
2675 struct audit_context *context = audit_context();
2676
2677 if (nargs <= 0 || nargs > AUDITSC_ARGS || !args)
2678 return -EINVAL;
2679 context->type = AUDIT_SOCKETCALL;
2680 context->socketcall.nargs = nargs;
2681 memcpy(context->socketcall.args, args, nargs * sizeof(unsigned long));
2682 return 0;
2683}
2684
2685/**
2686 * __audit_fd_pair - record audit data for pipe and socketpair
2687 * @fd1: the first file descriptor
2688 * @fd2: the second file descriptor
2689 *
2690 */
2691void __audit_fd_pair(int fd1, int fd2)
2692{
2693 struct audit_context *context = audit_context();
2694
2695 context->fds[0] = fd1;
2696 context->fds[1] = fd2;
2697}
2698
2699/**
2700 * __audit_sockaddr - record audit data for sys_bind, sys_connect, sys_sendto
2701 * @len: data length in user space
2702 * @a: data address in kernel space
2703 *
2704 * Returns 0 for success or NULL context or < 0 on error.
2705 */
2706int __audit_sockaddr(int len, void *a)
2707{
2708 struct audit_context *context = audit_context();
2709
2710 if (!context->sockaddr) {
2711 void *p = kmalloc(sizeof(struct sockaddr_storage), GFP_KERNEL);
2712
2713 if (!p)
2714 return -ENOMEM;
2715 context->sockaddr = p;
2716 }
2717
2718 context->sockaddr_len = len;
2719 memcpy(context->sockaddr, a, len);
2720 return 0;
2721}
2722
2723void __audit_ptrace(struct task_struct *t)
2724{
2725 struct audit_context *context = audit_context();
2726
2727 context->target_pid = task_tgid_nr(t);
2728 context->target_auid = audit_get_loginuid(t);
2729 context->target_uid = task_uid(t);
2730 context->target_sessionid = audit_get_sessionid(t);
2731 strscpy(context->target_comm, t->comm);
2732 security_task_getlsmprop_obj(t, &context->target_ref);
2733}
2734
2735/**
2736 * audit_signal_info_syscall - record signal info for syscalls
2737 * @t: task being signaled
2738 *
2739 * If the audit subsystem is being terminated, record the task (pid)
2740 * and uid that is doing that.
2741 */
2742int audit_signal_info_syscall(struct task_struct *t)
2743{
2744 struct audit_aux_data_pids *axp;
2745 struct audit_context *ctx = audit_context();
2746 kuid_t t_uid = task_uid(t);
2747
2748 if (!audit_signals || audit_dummy_context())
2749 return 0;
2750
2751 /* optimize the common case by putting first signal recipient directly
2752 * in audit_context */
2753 if (!ctx->target_pid) {
2754 ctx->target_pid = task_tgid_nr(t);
2755 ctx->target_auid = audit_get_loginuid(t);
2756 ctx->target_uid = t_uid;
2757 ctx->target_sessionid = audit_get_sessionid(t);
2758 strscpy(ctx->target_comm, t->comm);
2759 security_task_getlsmprop_obj(t, &ctx->target_ref);
2760 return 0;
2761 }
2762
2763 axp = (void *)ctx->aux_pids;
2764 if (!axp || axp->pid_count == AUDIT_AUX_PIDS) {
2765 axp = kzalloc(sizeof(*axp), GFP_ATOMIC);
2766 if (!axp)
2767 return -ENOMEM;
2768
2769 axp->d.type = AUDIT_OBJ_PID;
2770 axp->d.next = ctx->aux_pids;
2771 ctx->aux_pids = (void *)axp;
2772 }
2773 BUG_ON(axp->pid_count >= AUDIT_AUX_PIDS);
2774
2775 axp->target_pid[axp->pid_count] = task_tgid_nr(t);
2776 axp->target_auid[axp->pid_count] = audit_get_loginuid(t);
2777 axp->target_uid[axp->pid_count] = t_uid;
2778 axp->target_sessionid[axp->pid_count] = audit_get_sessionid(t);
2779 security_task_getlsmprop_obj(t, &axp->target_ref[axp->pid_count]);
2780 strscpy(axp->target_comm[axp->pid_count], t->comm);
2781 axp->pid_count++;
2782
2783 return 0;
2784}
2785
2786/**
2787 * __audit_log_bprm_fcaps - store information about a loading bprm and relevant fcaps
2788 * @bprm: pointer to the bprm being processed
2789 * @new: the proposed new credentials
2790 * @old: the old credentials
2791 *
2792 * Simply check if the proc already has the caps given by the file and if not
2793 * store the priv escalation info for later auditing at the end of the syscall
2794 *
2795 * -Eric
2796 */
2797int __audit_log_bprm_fcaps(struct linux_binprm *bprm,
2798 const struct cred *new, const struct cred *old)
2799{
2800 struct audit_aux_data_bprm_fcaps *ax;
2801 struct audit_context *context = audit_context();
2802 struct cpu_vfs_cap_data vcaps;
2803
2804 ax = kmalloc(sizeof(*ax), GFP_KERNEL);
2805 if (!ax)
2806 return -ENOMEM;
2807
2808 ax->d.type = AUDIT_BPRM_FCAPS;
2809 ax->d.next = context->aux;
2810 context->aux = (void *)ax;
2811
2812 get_vfs_caps_from_disk(&nop_mnt_idmap,
2813 bprm->file->f_path.dentry, &vcaps);
2814
2815 ax->fcap.permitted = vcaps.permitted;
2816 ax->fcap.inheritable = vcaps.inheritable;
2817 ax->fcap.fE = !!(vcaps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE);
2818 ax->fcap.rootid = vcaps.rootid;
2819 ax->fcap_ver = (vcaps.magic_etc & VFS_CAP_REVISION_MASK) >> VFS_CAP_REVISION_SHIFT;
2820
2821 ax->old_pcap.permitted = old->cap_permitted;
2822 ax->old_pcap.inheritable = old->cap_inheritable;
2823 ax->old_pcap.effective = old->cap_effective;
2824 ax->old_pcap.ambient = old->cap_ambient;
2825
2826 ax->new_pcap.permitted = new->cap_permitted;
2827 ax->new_pcap.inheritable = new->cap_inheritable;
2828 ax->new_pcap.effective = new->cap_effective;
2829 ax->new_pcap.ambient = new->cap_ambient;
2830 return 0;
2831}
2832
2833/**
2834 * __audit_log_capset - store information about the arguments to the capset syscall
2835 * @new: the new credentials
2836 * @old: the old (current) credentials
2837 *
2838 * Record the arguments userspace sent to sys_capset for later printing by the
2839 * audit system if applicable
2840 */
2841void __audit_log_capset(const struct cred *new, const struct cred *old)
2842{
2843 struct audit_context *context = audit_context();
2844
2845 context->capset.pid = task_tgid_nr(current);
2846 context->capset.cap.effective = new->cap_effective;
2847 context->capset.cap.inheritable = new->cap_effective;
2848 context->capset.cap.permitted = new->cap_permitted;
2849 context->capset.cap.ambient = new->cap_ambient;
2850 context->type = AUDIT_CAPSET;
2851}
2852
2853void __audit_mmap_fd(int fd, int flags)
2854{
2855 struct audit_context *context = audit_context();
2856
2857 context->mmap.fd = fd;
2858 context->mmap.flags = flags;
2859 context->type = AUDIT_MMAP;
2860}
2861
2862void __audit_openat2_how(struct open_how *how)
2863{
2864 struct audit_context *context = audit_context();
2865
2866 context->openat2.flags = how->flags;
2867 context->openat2.mode = how->mode;
2868 context->openat2.resolve = how->resolve;
2869 context->type = AUDIT_OPENAT2;
2870}
2871
2872void __audit_log_kern_module(char *name)
2873{
2874 struct audit_context *context = audit_context();
2875
2876 context->module.name = kstrdup(name, GFP_KERNEL);
2877 if (!context->module.name)
2878 audit_log_lost("out of memory in __audit_log_kern_module");
2879 context->type = AUDIT_KERN_MODULE;
2880}
2881
2882void __audit_fanotify(u32 response, struct fanotify_response_info_audit_rule *friar)
2883{
2884 /* {subj,obj}_trust values are {0,1,2}: no,yes,unknown */
2885 switch (friar->hdr.type) {
2886 case FAN_RESPONSE_INFO_NONE:
2887 audit_log(audit_context(), GFP_KERNEL, AUDIT_FANOTIFY,
2888 "resp=%u fan_type=%u fan_info=0 subj_trust=2 obj_trust=2",
2889 response, FAN_RESPONSE_INFO_NONE);
2890 break;
2891 case FAN_RESPONSE_INFO_AUDIT_RULE:
2892 audit_log(audit_context(), GFP_KERNEL, AUDIT_FANOTIFY,
2893 "resp=%u fan_type=%u fan_info=%X subj_trust=%u obj_trust=%u",
2894 response, friar->hdr.type, friar->rule_number,
2895 friar->subj_trust, friar->obj_trust);
2896 }
2897}
2898
2899void __audit_tk_injoffset(struct timespec64 offset)
2900{
2901 struct audit_context *context = audit_context();
2902
2903 /* only set type if not already set by NTP */
2904 if (!context->type)
2905 context->type = AUDIT_TIME_INJOFFSET;
2906 memcpy(&context->time.tk_injoffset, &offset, sizeof(offset));
2907}
2908
2909void __audit_ntp_log(const struct audit_ntp_data *ad)
2910{
2911 struct audit_context *context = audit_context();
2912 int type;
2913
2914 for (type = 0; type < AUDIT_NTP_NVALS; type++)
2915 if (ad->vals[type].newval != ad->vals[type].oldval) {
2916 /* unconditionally set type, overwriting TK */
2917 context->type = AUDIT_TIME_ADJNTPVAL;
2918 memcpy(&context->time.ntp_data, ad, sizeof(*ad));
2919 break;
2920 }
2921}
2922
2923void __audit_log_nfcfg(const char *name, u8 af, unsigned int nentries,
2924 enum audit_nfcfgop op, gfp_t gfp)
2925{
2926 struct audit_buffer *ab;
2927 char comm[sizeof(current->comm)];
2928
2929 ab = audit_log_start(audit_context(), gfp, AUDIT_NETFILTER_CFG);
2930 if (!ab)
2931 return;
2932 audit_log_format(ab, "table=%s family=%u entries=%u op=%s",
2933 name, af, nentries, audit_nfcfgs[op].s);
2934
2935 audit_log_format(ab, " pid=%u", task_tgid_nr(current));
2936 audit_log_task_context(ab); /* subj= */
2937 audit_log_format(ab, " comm=");
2938 audit_log_untrustedstring(ab, get_task_comm(comm, current));
2939 audit_log_end(ab);
2940}
2941EXPORT_SYMBOL_GPL(__audit_log_nfcfg);
2942
2943static void audit_log_task(struct audit_buffer *ab)
2944{
2945 kuid_t auid, uid;
2946 kgid_t gid;
2947 unsigned int sessionid;
2948 char comm[sizeof(current->comm)];
2949
2950 auid = audit_get_loginuid(current);
2951 sessionid = audit_get_sessionid(current);
2952 current_uid_gid(&uid, &gid);
2953
2954 audit_log_format(ab, "auid=%u uid=%u gid=%u ses=%u",
2955 from_kuid(&init_user_ns, auid),
2956 from_kuid(&init_user_ns, uid),
2957 from_kgid(&init_user_ns, gid),
2958 sessionid);
2959 audit_log_task_context(ab);
2960 audit_log_format(ab, " pid=%d comm=", task_tgid_nr(current));
2961 audit_log_untrustedstring(ab, get_task_comm(comm, current));
2962 audit_log_d_path_exe(ab, current->mm);
2963}
2964
2965/**
2966 * audit_core_dumps - record information about processes that end abnormally
2967 * @signr: signal value
2968 *
2969 * If a process ends with a core dump, something fishy is going on and we
2970 * should record the event for investigation.
2971 */
2972void audit_core_dumps(long signr)
2973{
2974 struct audit_buffer *ab;
2975
2976 if (!audit_enabled)
2977 return;
2978
2979 if (signr == SIGQUIT) /* don't care for those */
2980 return;
2981
2982 ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_ANOM_ABEND);
2983 if (unlikely(!ab))
2984 return;
2985 audit_log_task(ab);
2986 audit_log_format(ab, " sig=%ld res=1", signr);
2987 audit_log_end(ab);
2988}
2989
2990/**
2991 * audit_seccomp - record information about a seccomp action
2992 * @syscall: syscall number
2993 * @signr: signal value
2994 * @code: the seccomp action
2995 *
2996 * Record the information associated with a seccomp action. Event filtering for
2997 * seccomp actions that are not to be logged is done in seccomp_log().
2998 * Therefore, this function forces auditing independent of the audit_enabled
2999 * and dummy context state because seccomp actions should be logged even when
3000 * audit is not in use.
3001 */
3002void audit_seccomp(unsigned long syscall, long signr, int code)
3003{
3004 struct audit_buffer *ab;
3005
3006 ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_SECCOMP);
3007 if (unlikely(!ab))
3008 return;
3009 audit_log_task(ab);
3010 audit_log_format(ab, " sig=%ld arch=%x syscall=%ld compat=%d ip=0x%lx code=0x%x",
3011 signr, syscall_get_arch(current), syscall,
3012 in_compat_syscall(), KSTK_EIP(current), code);
3013 audit_log_end(ab);
3014}
3015
3016void audit_seccomp_actions_logged(const char *names, const char *old_names,
3017 int res)
3018{
3019 struct audit_buffer *ab;
3020
3021 if (!audit_enabled)
3022 return;
3023
3024 ab = audit_log_start(audit_context(), GFP_KERNEL,
3025 AUDIT_CONFIG_CHANGE);
3026 if (unlikely(!ab))
3027 return;
3028
3029 audit_log_format(ab,
3030 "op=seccomp-logging actions=%s old-actions=%s res=%d",
3031 names, old_names, res);
3032 audit_log_end(ab);
3033}
3034
3035struct list_head *audit_killed_trees(void)
3036{
3037 struct audit_context *ctx = audit_context();
3038 if (likely(!ctx || ctx->context == AUDIT_CTX_UNUSED))
3039 return NULL;
3040 return &ctx->killed_trees;
3041}
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#include <uapi/linux/netfilter/nf_tables.h>
79
80#include "audit.h"
81
82/* flags stating the success for a syscall */
83#define AUDITSC_INVALID 0
84#define AUDITSC_SUCCESS 1
85#define AUDITSC_FAILURE 2
86
87/* no execve audit message should be longer than this (userspace limits),
88 * see the note near the top of audit_log_execve_info() about this value */
89#define MAX_EXECVE_AUDIT_LEN 7500
90
91/* max length to print of cmdline/proctitle value during audit */
92#define MAX_PROCTITLE_AUDIT_LEN 128
93
94/* number of audit rules */
95int audit_n_rules;
96
97/* determines whether we collect data for signals sent */
98int audit_signals;
99
100struct audit_aux_data {
101 struct audit_aux_data *next;
102 int type;
103};
104
105/* Number of target pids per aux struct. */
106#define AUDIT_AUX_PIDS 16
107
108struct audit_aux_data_pids {
109 struct audit_aux_data d;
110 pid_t target_pid[AUDIT_AUX_PIDS];
111 kuid_t target_auid[AUDIT_AUX_PIDS];
112 kuid_t target_uid[AUDIT_AUX_PIDS];
113 unsigned int target_sessionid[AUDIT_AUX_PIDS];
114 u32 target_sid[AUDIT_AUX_PIDS];
115 char target_comm[AUDIT_AUX_PIDS][TASK_COMM_LEN];
116 int pid_count;
117};
118
119struct audit_aux_data_bprm_fcaps {
120 struct audit_aux_data d;
121 struct audit_cap_data fcap;
122 unsigned int fcap_ver;
123 struct audit_cap_data old_pcap;
124 struct audit_cap_data new_pcap;
125};
126
127struct audit_tree_refs {
128 struct audit_tree_refs *next;
129 struct audit_chunk *c[31];
130};
131
132struct audit_nfcfgop_tab {
133 enum audit_nfcfgop op;
134 const char *s;
135};
136
137static const struct audit_nfcfgop_tab audit_nfcfgs[] = {
138 { AUDIT_XT_OP_REGISTER, "xt_register" },
139 { AUDIT_XT_OP_REPLACE, "xt_replace" },
140 { AUDIT_XT_OP_UNREGISTER, "xt_unregister" },
141 { AUDIT_NFT_OP_TABLE_REGISTER, "nft_register_table" },
142 { AUDIT_NFT_OP_TABLE_UNREGISTER, "nft_unregister_table" },
143 { AUDIT_NFT_OP_CHAIN_REGISTER, "nft_register_chain" },
144 { AUDIT_NFT_OP_CHAIN_UNREGISTER, "nft_unregister_chain" },
145 { AUDIT_NFT_OP_RULE_REGISTER, "nft_register_rule" },
146 { AUDIT_NFT_OP_RULE_UNREGISTER, "nft_unregister_rule" },
147 { AUDIT_NFT_OP_SET_REGISTER, "nft_register_set" },
148 { AUDIT_NFT_OP_SET_UNREGISTER, "nft_unregister_set" },
149 { AUDIT_NFT_OP_SETELEM_REGISTER, "nft_register_setelem" },
150 { AUDIT_NFT_OP_SETELEM_UNREGISTER, "nft_unregister_setelem" },
151 { AUDIT_NFT_OP_GEN_REGISTER, "nft_register_gen" },
152 { AUDIT_NFT_OP_OBJ_REGISTER, "nft_register_obj" },
153 { AUDIT_NFT_OP_OBJ_UNREGISTER, "nft_unregister_obj" },
154 { AUDIT_NFT_OP_OBJ_RESET, "nft_reset_obj" },
155 { AUDIT_NFT_OP_FLOWTABLE_REGISTER, "nft_register_flowtable" },
156 { AUDIT_NFT_OP_FLOWTABLE_UNREGISTER, "nft_unregister_flowtable" },
157 { AUDIT_NFT_OP_INVALID, "nft_invalid" },
158};
159
160static int audit_match_perm(struct audit_context *ctx, int mask)
161{
162 unsigned n;
163
164 if (unlikely(!ctx))
165 return 0;
166 n = ctx->major;
167
168 switch (audit_classify_syscall(ctx->arch, n)) {
169 case 0: /* native */
170 if ((mask & AUDIT_PERM_WRITE) &&
171 audit_match_class(AUDIT_CLASS_WRITE, n))
172 return 1;
173 if ((mask & AUDIT_PERM_READ) &&
174 audit_match_class(AUDIT_CLASS_READ, n))
175 return 1;
176 if ((mask & AUDIT_PERM_ATTR) &&
177 audit_match_class(AUDIT_CLASS_CHATTR, n))
178 return 1;
179 return 0;
180 case 1: /* 32bit on biarch */
181 if ((mask & AUDIT_PERM_WRITE) &&
182 audit_match_class(AUDIT_CLASS_WRITE_32, n))
183 return 1;
184 if ((mask & AUDIT_PERM_READ) &&
185 audit_match_class(AUDIT_CLASS_READ_32, n))
186 return 1;
187 if ((mask & AUDIT_PERM_ATTR) &&
188 audit_match_class(AUDIT_CLASS_CHATTR_32, n))
189 return 1;
190 return 0;
191 case 2: /* open */
192 return mask & ACC_MODE(ctx->argv[1]);
193 case 3: /* openat */
194 return mask & ACC_MODE(ctx->argv[2]);
195 case 4: /* socketcall */
196 return ((mask & AUDIT_PERM_WRITE) && ctx->argv[0] == SYS_BIND);
197 case 5: /* execve */
198 return mask & AUDIT_PERM_EXEC;
199 default:
200 return 0;
201 }
202}
203
204static int audit_match_filetype(struct audit_context *ctx, int val)
205{
206 struct audit_names *n;
207 umode_t mode = (umode_t)val;
208
209 if (unlikely(!ctx))
210 return 0;
211
212 list_for_each_entry(n, &ctx->names_list, list) {
213 if ((n->ino != AUDIT_INO_UNSET) &&
214 ((n->mode & S_IFMT) == mode))
215 return 1;
216 }
217
218 return 0;
219}
220
221/*
222 * We keep a linked list of fixed-sized (31 pointer) arrays of audit_chunk *;
223 * ->first_trees points to its beginning, ->trees - to the current end of data.
224 * ->tree_count is the number of free entries in array pointed to by ->trees.
225 * Original condition is (NULL, NULL, 0); as soon as it grows we never revert to NULL,
226 * "empty" becomes (p, p, 31) afterwards. We don't shrink the list (and seriously,
227 * it's going to remain 1-element for almost any setup) until we free context itself.
228 * References in it _are_ dropped - at the same time we free/drop aux stuff.
229 */
230
231static void audit_set_auditable(struct audit_context *ctx)
232{
233 if (!ctx->prio) {
234 ctx->prio = 1;
235 ctx->current_state = AUDIT_STATE_RECORD;
236 }
237}
238
239static int put_tree_ref(struct audit_context *ctx, struct audit_chunk *chunk)
240{
241 struct audit_tree_refs *p = ctx->trees;
242 int left = ctx->tree_count;
243
244 if (likely(left)) {
245 p->c[--left] = chunk;
246 ctx->tree_count = left;
247 return 1;
248 }
249 if (!p)
250 return 0;
251 p = p->next;
252 if (p) {
253 p->c[30] = chunk;
254 ctx->trees = p;
255 ctx->tree_count = 30;
256 return 1;
257 }
258 return 0;
259}
260
261static int grow_tree_refs(struct audit_context *ctx)
262{
263 struct audit_tree_refs *p = ctx->trees;
264
265 ctx->trees = kzalloc(sizeof(struct audit_tree_refs), GFP_KERNEL);
266 if (!ctx->trees) {
267 ctx->trees = p;
268 return 0;
269 }
270 if (p)
271 p->next = ctx->trees;
272 else
273 ctx->first_trees = ctx->trees;
274 ctx->tree_count = 31;
275 return 1;
276}
277
278static void unroll_tree_refs(struct audit_context *ctx,
279 struct audit_tree_refs *p, int count)
280{
281 struct audit_tree_refs *q;
282 int n;
283
284 if (!p) {
285 /* we started with empty chain */
286 p = ctx->first_trees;
287 count = 31;
288 /* if the very first allocation has failed, nothing to do */
289 if (!p)
290 return;
291 }
292 n = count;
293 for (q = p; q != ctx->trees; q = q->next, n = 31) {
294 while (n--) {
295 audit_put_chunk(q->c[n]);
296 q->c[n] = NULL;
297 }
298 }
299 while (n-- > ctx->tree_count) {
300 audit_put_chunk(q->c[n]);
301 q->c[n] = NULL;
302 }
303 ctx->trees = p;
304 ctx->tree_count = count;
305}
306
307static void free_tree_refs(struct audit_context *ctx)
308{
309 struct audit_tree_refs *p, *q;
310
311 for (p = ctx->first_trees; p; p = q) {
312 q = p->next;
313 kfree(p);
314 }
315}
316
317static int match_tree_refs(struct audit_context *ctx, struct audit_tree *tree)
318{
319 struct audit_tree_refs *p;
320 int n;
321
322 if (!tree)
323 return 0;
324 /* full ones */
325 for (p = ctx->first_trees; p != ctx->trees; p = p->next) {
326 for (n = 0; n < 31; n++)
327 if (audit_tree_match(p->c[n], tree))
328 return 1;
329 }
330 /* partial */
331 if (p) {
332 for (n = ctx->tree_count; n < 31; n++)
333 if (audit_tree_match(p->c[n], tree))
334 return 1;
335 }
336 return 0;
337}
338
339static int audit_compare_uid(kuid_t uid,
340 struct audit_names *name,
341 struct audit_field *f,
342 struct audit_context *ctx)
343{
344 struct audit_names *n;
345 int rc;
346
347 if (name) {
348 rc = audit_uid_comparator(uid, f->op, name->uid);
349 if (rc)
350 return rc;
351 }
352
353 if (ctx) {
354 list_for_each_entry(n, &ctx->names_list, list) {
355 rc = audit_uid_comparator(uid, f->op, n->uid);
356 if (rc)
357 return rc;
358 }
359 }
360 return 0;
361}
362
363static int audit_compare_gid(kgid_t gid,
364 struct audit_names *name,
365 struct audit_field *f,
366 struct audit_context *ctx)
367{
368 struct audit_names *n;
369 int rc;
370
371 if (name) {
372 rc = audit_gid_comparator(gid, f->op, name->gid);
373 if (rc)
374 return rc;
375 }
376
377 if (ctx) {
378 list_for_each_entry(n, &ctx->names_list, list) {
379 rc = audit_gid_comparator(gid, f->op, n->gid);
380 if (rc)
381 return rc;
382 }
383 }
384 return 0;
385}
386
387static int audit_field_compare(struct task_struct *tsk,
388 const struct cred *cred,
389 struct audit_field *f,
390 struct audit_context *ctx,
391 struct audit_names *name)
392{
393 switch (f->val) {
394 /* process to file object comparisons */
395 case AUDIT_COMPARE_UID_TO_OBJ_UID:
396 return audit_compare_uid(cred->uid, name, f, ctx);
397 case AUDIT_COMPARE_GID_TO_OBJ_GID:
398 return audit_compare_gid(cred->gid, name, f, ctx);
399 case AUDIT_COMPARE_EUID_TO_OBJ_UID:
400 return audit_compare_uid(cred->euid, name, f, ctx);
401 case AUDIT_COMPARE_EGID_TO_OBJ_GID:
402 return audit_compare_gid(cred->egid, name, f, ctx);
403 case AUDIT_COMPARE_AUID_TO_OBJ_UID:
404 return audit_compare_uid(audit_get_loginuid(tsk), name, f, ctx);
405 case AUDIT_COMPARE_SUID_TO_OBJ_UID:
406 return audit_compare_uid(cred->suid, name, f, ctx);
407 case AUDIT_COMPARE_SGID_TO_OBJ_GID:
408 return audit_compare_gid(cred->sgid, name, f, ctx);
409 case AUDIT_COMPARE_FSUID_TO_OBJ_UID:
410 return audit_compare_uid(cred->fsuid, name, f, ctx);
411 case AUDIT_COMPARE_FSGID_TO_OBJ_GID:
412 return audit_compare_gid(cred->fsgid, name, f, ctx);
413 /* uid comparisons */
414 case AUDIT_COMPARE_UID_TO_AUID:
415 return audit_uid_comparator(cred->uid, f->op,
416 audit_get_loginuid(tsk));
417 case AUDIT_COMPARE_UID_TO_EUID:
418 return audit_uid_comparator(cred->uid, f->op, cred->euid);
419 case AUDIT_COMPARE_UID_TO_SUID:
420 return audit_uid_comparator(cred->uid, f->op, cred->suid);
421 case AUDIT_COMPARE_UID_TO_FSUID:
422 return audit_uid_comparator(cred->uid, f->op, cred->fsuid);
423 /* auid comparisons */
424 case AUDIT_COMPARE_AUID_TO_EUID:
425 return audit_uid_comparator(audit_get_loginuid(tsk), f->op,
426 cred->euid);
427 case AUDIT_COMPARE_AUID_TO_SUID:
428 return audit_uid_comparator(audit_get_loginuid(tsk), f->op,
429 cred->suid);
430 case AUDIT_COMPARE_AUID_TO_FSUID:
431 return audit_uid_comparator(audit_get_loginuid(tsk), f->op,
432 cred->fsuid);
433 /* euid comparisons */
434 case AUDIT_COMPARE_EUID_TO_SUID:
435 return audit_uid_comparator(cred->euid, f->op, cred->suid);
436 case AUDIT_COMPARE_EUID_TO_FSUID:
437 return audit_uid_comparator(cred->euid, f->op, cred->fsuid);
438 /* suid comparisons */
439 case AUDIT_COMPARE_SUID_TO_FSUID:
440 return audit_uid_comparator(cred->suid, f->op, cred->fsuid);
441 /* gid comparisons */
442 case AUDIT_COMPARE_GID_TO_EGID:
443 return audit_gid_comparator(cred->gid, f->op, cred->egid);
444 case AUDIT_COMPARE_GID_TO_SGID:
445 return audit_gid_comparator(cred->gid, f->op, cred->sgid);
446 case AUDIT_COMPARE_GID_TO_FSGID:
447 return audit_gid_comparator(cred->gid, f->op, cred->fsgid);
448 /* egid comparisons */
449 case AUDIT_COMPARE_EGID_TO_SGID:
450 return audit_gid_comparator(cred->egid, f->op, cred->sgid);
451 case AUDIT_COMPARE_EGID_TO_FSGID:
452 return audit_gid_comparator(cred->egid, f->op, cred->fsgid);
453 /* sgid comparison */
454 case AUDIT_COMPARE_SGID_TO_FSGID:
455 return audit_gid_comparator(cred->sgid, f->op, cred->fsgid);
456 default:
457 WARN(1, "Missing AUDIT_COMPARE define. Report as a bug\n");
458 return 0;
459 }
460 return 0;
461}
462
463/* Determine if any context name data matches a rule's watch data */
464/* Compare a task_struct with an audit_rule. Return 1 on match, 0
465 * otherwise.
466 *
467 * If task_creation is true, this is an explicit indication that we are
468 * filtering a task rule at task creation time. This and tsk == current are
469 * the only situations where tsk->cred may be accessed without an rcu read lock.
470 */
471static int audit_filter_rules(struct task_struct *tsk,
472 struct audit_krule *rule,
473 struct audit_context *ctx,
474 struct audit_names *name,
475 enum audit_state *state,
476 bool task_creation)
477{
478 const struct cred *cred;
479 int i, need_sid = 1;
480 u32 sid;
481 unsigned int sessionid;
482
483 cred = rcu_dereference_check(tsk->cred, tsk == current || task_creation);
484
485 for (i = 0; i < rule->field_count; i++) {
486 struct audit_field *f = &rule->fields[i];
487 struct audit_names *n;
488 int result = 0;
489 pid_t pid;
490
491 switch (f->type) {
492 case AUDIT_PID:
493 pid = task_tgid_nr(tsk);
494 result = audit_comparator(pid, f->op, f->val);
495 break;
496 case AUDIT_PPID:
497 if (ctx) {
498 if (!ctx->ppid)
499 ctx->ppid = task_ppid_nr(tsk);
500 result = audit_comparator(ctx->ppid, f->op, f->val);
501 }
502 break;
503 case AUDIT_EXE:
504 result = audit_exe_compare(tsk, rule->exe);
505 if (f->op == Audit_not_equal)
506 result = !result;
507 break;
508 case AUDIT_UID:
509 result = audit_uid_comparator(cred->uid, f->op, f->uid);
510 break;
511 case AUDIT_EUID:
512 result = audit_uid_comparator(cred->euid, f->op, f->uid);
513 break;
514 case AUDIT_SUID:
515 result = audit_uid_comparator(cred->suid, f->op, f->uid);
516 break;
517 case AUDIT_FSUID:
518 result = audit_uid_comparator(cred->fsuid, f->op, f->uid);
519 break;
520 case AUDIT_GID:
521 result = audit_gid_comparator(cred->gid, f->op, f->gid);
522 if (f->op == Audit_equal) {
523 if (!result)
524 result = groups_search(cred->group_info, f->gid);
525 } else if (f->op == Audit_not_equal) {
526 if (result)
527 result = !groups_search(cred->group_info, f->gid);
528 }
529 break;
530 case AUDIT_EGID:
531 result = audit_gid_comparator(cred->egid, f->op, f->gid);
532 if (f->op == Audit_equal) {
533 if (!result)
534 result = groups_search(cred->group_info, f->gid);
535 } else if (f->op == Audit_not_equal) {
536 if (result)
537 result = !groups_search(cred->group_info, f->gid);
538 }
539 break;
540 case AUDIT_SGID:
541 result = audit_gid_comparator(cred->sgid, f->op, f->gid);
542 break;
543 case AUDIT_FSGID:
544 result = audit_gid_comparator(cred->fsgid, f->op, f->gid);
545 break;
546 case AUDIT_SESSIONID:
547 sessionid = audit_get_sessionid(tsk);
548 result = audit_comparator(sessionid, f->op, f->val);
549 break;
550 case AUDIT_PERS:
551 result = audit_comparator(tsk->personality, f->op, f->val);
552 break;
553 case AUDIT_ARCH:
554 if (ctx)
555 result = audit_comparator(ctx->arch, f->op, f->val);
556 break;
557
558 case AUDIT_EXIT:
559 if (ctx && ctx->return_valid != AUDITSC_INVALID)
560 result = audit_comparator(ctx->return_code, f->op, f->val);
561 break;
562 case AUDIT_SUCCESS:
563 if (ctx && ctx->return_valid != AUDITSC_INVALID) {
564 if (f->val)
565 result = audit_comparator(ctx->return_valid, f->op, AUDITSC_SUCCESS);
566 else
567 result = audit_comparator(ctx->return_valid, f->op, AUDITSC_FAILURE);
568 }
569 break;
570 case AUDIT_DEVMAJOR:
571 if (name) {
572 if (audit_comparator(MAJOR(name->dev), f->op, f->val) ||
573 audit_comparator(MAJOR(name->rdev), f->op, f->val))
574 ++result;
575 } else if (ctx) {
576 list_for_each_entry(n, &ctx->names_list, list) {
577 if (audit_comparator(MAJOR(n->dev), f->op, f->val) ||
578 audit_comparator(MAJOR(n->rdev), f->op, f->val)) {
579 ++result;
580 break;
581 }
582 }
583 }
584 break;
585 case AUDIT_DEVMINOR:
586 if (name) {
587 if (audit_comparator(MINOR(name->dev), f->op, f->val) ||
588 audit_comparator(MINOR(name->rdev), f->op, f->val))
589 ++result;
590 } else if (ctx) {
591 list_for_each_entry(n, &ctx->names_list, list) {
592 if (audit_comparator(MINOR(n->dev), f->op, f->val) ||
593 audit_comparator(MINOR(n->rdev), f->op, f->val)) {
594 ++result;
595 break;
596 }
597 }
598 }
599 break;
600 case AUDIT_INODE:
601 if (name)
602 result = audit_comparator(name->ino, f->op, f->val);
603 else if (ctx) {
604 list_for_each_entry(n, &ctx->names_list, list) {
605 if (audit_comparator(n->ino, f->op, f->val)) {
606 ++result;
607 break;
608 }
609 }
610 }
611 break;
612 case AUDIT_OBJ_UID:
613 if (name) {
614 result = audit_uid_comparator(name->uid, f->op, f->uid);
615 } else if (ctx) {
616 list_for_each_entry(n, &ctx->names_list, list) {
617 if (audit_uid_comparator(n->uid, f->op, f->uid)) {
618 ++result;
619 break;
620 }
621 }
622 }
623 break;
624 case AUDIT_OBJ_GID:
625 if (name) {
626 result = audit_gid_comparator(name->gid, f->op, f->gid);
627 } else if (ctx) {
628 list_for_each_entry(n, &ctx->names_list, list) {
629 if (audit_gid_comparator(n->gid, f->op, f->gid)) {
630 ++result;
631 break;
632 }
633 }
634 }
635 break;
636 case AUDIT_WATCH:
637 if (name) {
638 result = audit_watch_compare(rule->watch,
639 name->ino,
640 name->dev);
641 if (f->op == Audit_not_equal)
642 result = !result;
643 }
644 break;
645 case AUDIT_DIR:
646 if (ctx) {
647 result = match_tree_refs(ctx, rule->tree);
648 if (f->op == Audit_not_equal)
649 result = !result;
650 }
651 break;
652 case AUDIT_LOGINUID:
653 result = audit_uid_comparator(audit_get_loginuid(tsk),
654 f->op, f->uid);
655 break;
656 case AUDIT_LOGINUID_SET:
657 result = audit_comparator(audit_loginuid_set(tsk), f->op, f->val);
658 break;
659 case AUDIT_SADDR_FAM:
660 if (ctx && ctx->sockaddr)
661 result = audit_comparator(ctx->sockaddr->ss_family,
662 f->op, f->val);
663 break;
664 case AUDIT_SUBJ_USER:
665 case AUDIT_SUBJ_ROLE:
666 case AUDIT_SUBJ_TYPE:
667 case AUDIT_SUBJ_SEN:
668 case AUDIT_SUBJ_CLR:
669 /* NOTE: this may return negative values indicating
670 a temporary error. We simply treat this as a
671 match for now to avoid losing information that
672 may be wanted. An error message will also be
673 logged upon error */
674 if (f->lsm_rule) {
675 if (need_sid) {
676 security_task_getsecid_subj(tsk, &sid);
677 need_sid = 0;
678 }
679 result = security_audit_rule_match(sid, f->type,
680 f->op,
681 f->lsm_rule);
682 }
683 break;
684 case AUDIT_OBJ_USER:
685 case AUDIT_OBJ_ROLE:
686 case AUDIT_OBJ_TYPE:
687 case AUDIT_OBJ_LEV_LOW:
688 case AUDIT_OBJ_LEV_HIGH:
689 /* The above note for AUDIT_SUBJ_USER...AUDIT_SUBJ_CLR
690 also applies here */
691 if (f->lsm_rule) {
692 /* Find files that match */
693 if (name) {
694 result = security_audit_rule_match(
695 name->osid,
696 f->type,
697 f->op,
698 f->lsm_rule);
699 } else if (ctx) {
700 list_for_each_entry(n, &ctx->names_list, list) {
701 if (security_audit_rule_match(
702 n->osid,
703 f->type,
704 f->op,
705 f->lsm_rule)) {
706 ++result;
707 break;
708 }
709 }
710 }
711 /* Find ipc objects that match */
712 if (!ctx || ctx->type != AUDIT_IPC)
713 break;
714 if (security_audit_rule_match(ctx->ipc.osid,
715 f->type, f->op,
716 f->lsm_rule))
717 ++result;
718 }
719 break;
720 case AUDIT_ARG0:
721 case AUDIT_ARG1:
722 case AUDIT_ARG2:
723 case AUDIT_ARG3:
724 if (ctx)
725 result = audit_comparator(ctx->argv[f->type-AUDIT_ARG0], f->op, f->val);
726 break;
727 case AUDIT_FILTERKEY:
728 /* ignore this field for filtering */
729 result = 1;
730 break;
731 case AUDIT_PERM:
732 result = audit_match_perm(ctx, f->val);
733 if (f->op == Audit_not_equal)
734 result = !result;
735 break;
736 case AUDIT_FILETYPE:
737 result = audit_match_filetype(ctx, f->val);
738 if (f->op == Audit_not_equal)
739 result = !result;
740 break;
741 case AUDIT_FIELD_COMPARE:
742 result = audit_field_compare(tsk, cred, f, ctx, name);
743 break;
744 }
745 if (!result)
746 return 0;
747 }
748
749 if (ctx) {
750 if (rule->prio <= ctx->prio)
751 return 0;
752 if (rule->filterkey) {
753 kfree(ctx->filterkey);
754 ctx->filterkey = kstrdup(rule->filterkey, GFP_ATOMIC);
755 }
756 ctx->prio = rule->prio;
757 }
758 switch (rule->action) {
759 case AUDIT_NEVER:
760 *state = AUDIT_STATE_DISABLED;
761 break;
762 case AUDIT_ALWAYS:
763 *state = AUDIT_STATE_RECORD;
764 break;
765 }
766 return 1;
767}
768
769/* At process creation time, we can determine if system-call auditing is
770 * completely disabled for this task. Since we only have the task
771 * structure at this point, we can only check uid and gid.
772 */
773static enum audit_state audit_filter_task(struct task_struct *tsk, char **key)
774{
775 struct audit_entry *e;
776 enum audit_state state;
777
778 rcu_read_lock();
779 list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_TASK], list) {
780 if (audit_filter_rules(tsk, &e->rule, NULL, NULL,
781 &state, true)) {
782 if (state == AUDIT_STATE_RECORD)
783 *key = kstrdup(e->rule.filterkey, GFP_ATOMIC);
784 rcu_read_unlock();
785 return state;
786 }
787 }
788 rcu_read_unlock();
789 return AUDIT_STATE_BUILD;
790}
791
792static int audit_in_mask(const struct audit_krule *rule, unsigned long val)
793{
794 int word, bit;
795
796 if (val > 0xffffffff)
797 return false;
798
799 word = AUDIT_WORD(val);
800 if (word >= AUDIT_BITMASK_SIZE)
801 return false;
802
803 bit = AUDIT_BIT(val);
804
805 return rule->mask[word] & bit;
806}
807
808/* At syscall exit time, this filter is called if the audit_state is
809 * not low enough that auditing cannot take place, but is also not
810 * high enough that we already know we have to write an audit record
811 * (i.e., the state is AUDIT_STATE_BUILD).
812 */
813static void audit_filter_syscall(struct task_struct *tsk,
814 struct audit_context *ctx)
815{
816 struct audit_entry *e;
817 enum audit_state state;
818
819 if (auditd_test_task(tsk))
820 return;
821
822 rcu_read_lock();
823 list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_EXIT], list) {
824 if (audit_in_mask(&e->rule, ctx->major) &&
825 audit_filter_rules(tsk, &e->rule, ctx, NULL,
826 &state, false)) {
827 rcu_read_unlock();
828 ctx->current_state = state;
829 return;
830 }
831 }
832 rcu_read_unlock();
833 return;
834}
835
836/*
837 * Given an audit_name check the inode hash table to see if they match.
838 * Called holding the rcu read lock to protect the use of audit_inode_hash
839 */
840static int audit_filter_inode_name(struct task_struct *tsk,
841 struct audit_names *n,
842 struct audit_context *ctx) {
843 int h = audit_hash_ino((u32)n->ino);
844 struct list_head *list = &audit_inode_hash[h];
845 struct audit_entry *e;
846 enum audit_state state;
847
848 list_for_each_entry_rcu(e, list, list) {
849 if (audit_in_mask(&e->rule, ctx->major) &&
850 audit_filter_rules(tsk, &e->rule, ctx, n, &state, false)) {
851 ctx->current_state = state;
852 return 1;
853 }
854 }
855 return 0;
856}
857
858/* At syscall exit time, this filter is called if any audit_names have been
859 * collected during syscall processing. We only check rules in sublists at hash
860 * buckets applicable to the inode numbers in audit_names.
861 * Regarding audit_state, same rules apply as for audit_filter_syscall().
862 */
863void audit_filter_inodes(struct task_struct *tsk, struct audit_context *ctx)
864{
865 struct audit_names *n;
866
867 if (auditd_test_task(tsk))
868 return;
869
870 rcu_read_lock();
871
872 list_for_each_entry(n, &ctx->names_list, list) {
873 if (audit_filter_inode_name(tsk, n, ctx))
874 break;
875 }
876 rcu_read_unlock();
877}
878
879static inline void audit_proctitle_free(struct audit_context *context)
880{
881 kfree(context->proctitle.value);
882 context->proctitle.value = NULL;
883 context->proctitle.len = 0;
884}
885
886static inline void audit_free_module(struct audit_context *context)
887{
888 if (context->type == AUDIT_KERN_MODULE) {
889 kfree(context->module.name);
890 context->module.name = NULL;
891 }
892}
893static inline void audit_free_names(struct audit_context *context)
894{
895 struct audit_names *n, *next;
896
897 list_for_each_entry_safe(n, next, &context->names_list, list) {
898 list_del(&n->list);
899 if (n->name)
900 putname(n->name);
901 if (n->should_free)
902 kfree(n);
903 }
904 context->name_count = 0;
905 path_put(&context->pwd);
906 context->pwd.dentry = NULL;
907 context->pwd.mnt = NULL;
908}
909
910static inline void audit_free_aux(struct audit_context *context)
911{
912 struct audit_aux_data *aux;
913
914 while ((aux = context->aux)) {
915 context->aux = aux->next;
916 kfree(aux);
917 }
918 while ((aux = context->aux_pids)) {
919 context->aux_pids = aux->next;
920 kfree(aux);
921 }
922}
923
924static inline struct audit_context *audit_alloc_context(enum audit_state state)
925{
926 struct audit_context *context;
927
928 context = kzalloc(sizeof(*context), GFP_KERNEL);
929 if (!context)
930 return NULL;
931 context->state = state;
932 context->prio = state == AUDIT_STATE_RECORD ? ~0ULL : 0;
933 INIT_LIST_HEAD(&context->killed_trees);
934 INIT_LIST_HEAD(&context->names_list);
935 context->fds[0] = -1;
936 context->return_valid = AUDITSC_INVALID;
937 return context;
938}
939
940/**
941 * audit_alloc - allocate an audit context block for a task
942 * @tsk: task
943 *
944 * Filter on the task information and allocate a per-task audit context
945 * if necessary. Doing so turns on system call auditing for the
946 * specified task. This is called from copy_process, so no lock is
947 * needed.
948 */
949int audit_alloc(struct task_struct *tsk)
950{
951 struct audit_context *context;
952 enum audit_state state;
953 char *key = NULL;
954
955 if (likely(!audit_ever_enabled))
956 return 0; /* Return if not auditing. */
957
958 state = audit_filter_task(tsk, &key);
959 if (state == AUDIT_STATE_DISABLED) {
960 clear_task_syscall_work(tsk, SYSCALL_AUDIT);
961 return 0;
962 }
963
964 if (!(context = audit_alloc_context(state))) {
965 kfree(key);
966 audit_log_lost("out of memory in audit_alloc");
967 return -ENOMEM;
968 }
969 context->filterkey = key;
970
971 audit_set_context(tsk, context);
972 set_task_syscall_work(tsk, SYSCALL_AUDIT);
973 return 0;
974}
975
976static inline void audit_free_context(struct audit_context *context)
977{
978 audit_free_module(context);
979 audit_free_names(context);
980 unroll_tree_refs(context, NULL, 0);
981 free_tree_refs(context);
982 audit_free_aux(context);
983 kfree(context->filterkey);
984 kfree(context->sockaddr);
985 audit_proctitle_free(context);
986 kfree(context);
987}
988
989static int audit_log_pid_context(struct audit_context *context, pid_t pid,
990 kuid_t auid, kuid_t uid, unsigned int sessionid,
991 u32 sid, char *comm)
992{
993 struct audit_buffer *ab;
994 char *ctx = NULL;
995 u32 len;
996 int rc = 0;
997
998 ab = audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID);
999 if (!ab)
1000 return rc;
1001
1002 audit_log_format(ab, "opid=%d oauid=%d ouid=%d oses=%d", pid,
1003 from_kuid(&init_user_ns, auid),
1004 from_kuid(&init_user_ns, uid), sessionid);
1005 if (sid) {
1006 if (security_secid_to_secctx(sid, &ctx, &len)) {
1007 audit_log_format(ab, " obj=(none)");
1008 rc = 1;
1009 } else {
1010 audit_log_format(ab, " obj=%s", ctx);
1011 security_release_secctx(ctx, len);
1012 }
1013 }
1014 audit_log_format(ab, " ocomm=");
1015 audit_log_untrustedstring(ab, comm);
1016 audit_log_end(ab);
1017
1018 return rc;
1019}
1020
1021static void audit_log_execve_info(struct audit_context *context,
1022 struct audit_buffer **ab)
1023{
1024 long len_max;
1025 long len_rem;
1026 long len_full;
1027 long len_buf;
1028 long len_abuf = 0;
1029 long len_tmp;
1030 bool require_data;
1031 bool encode;
1032 unsigned int iter;
1033 unsigned int arg;
1034 char *buf_head;
1035 char *buf;
1036 const char __user *p = (const char __user *)current->mm->arg_start;
1037
1038 /* NOTE: this buffer needs to be large enough to hold all the non-arg
1039 * data we put in the audit record for this argument (see the
1040 * code below) ... at this point in time 96 is plenty */
1041 char abuf[96];
1042
1043 /* NOTE: we set MAX_EXECVE_AUDIT_LEN to a rather arbitrary limit, the
1044 * current value of 7500 is not as important as the fact that it
1045 * is less than 8k, a setting of 7500 gives us plenty of wiggle
1046 * room if we go over a little bit in the logging below */
1047 WARN_ON_ONCE(MAX_EXECVE_AUDIT_LEN > 7500);
1048 len_max = MAX_EXECVE_AUDIT_LEN;
1049
1050 /* scratch buffer to hold the userspace args */
1051 buf_head = kmalloc(MAX_EXECVE_AUDIT_LEN + 1, GFP_KERNEL);
1052 if (!buf_head) {
1053 audit_panic("out of memory for argv string");
1054 return;
1055 }
1056 buf = buf_head;
1057
1058 audit_log_format(*ab, "argc=%d", context->execve.argc);
1059
1060 len_rem = len_max;
1061 len_buf = 0;
1062 len_full = 0;
1063 require_data = true;
1064 encode = false;
1065 iter = 0;
1066 arg = 0;
1067 do {
1068 /* NOTE: we don't ever want to trust this value for anything
1069 * serious, but the audit record format insists we
1070 * provide an argument length for really long arguments,
1071 * e.g. > MAX_EXECVE_AUDIT_LEN, so we have no choice but
1072 * to use strncpy_from_user() to obtain this value for
1073 * recording in the log, although we don't use it
1074 * anywhere here to avoid a double-fetch problem */
1075 if (len_full == 0)
1076 len_full = strnlen_user(p, MAX_ARG_STRLEN) - 1;
1077
1078 /* read more data from userspace */
1079 if (require_data) {
1080 /* can we make more room in the buffer? */
1081 if (buf != buf_head) {
1082 memmove(buf_head, buf, len_buf);
1083 buf = buf_head;
1084 }
1085
1086 /* fetch as much as we can of the argument */
1087 len_tmp = strncpy_from_user(&buf_head[len_buf], p,
1088 len_max - len_buf);
1089 if (len_tmp == -EFAULT) {
1090 /* unable to copy from userspace */
1091 send_sig(SIGKILL, current, 0);
1092 goto out;
1093 } else if (len_tmp == (len_max - len_buf)) {
1094 /* buffer is not large enough */
1095 require_data = true;
1096 /* NOTE: if we are going to span multiple
1097 * buffers force the encoding so we stand
1098 * a chance at a sane len_full value and
1099 * consistent record encoding */
1100 encode = true;
1101 len_full = len_full * 2;
1102 p += len_tmp;
1103 } else {
1104 require_data = false;
1105 if (!encode)
1106 encode = audit_string_contains_control(
1107 buf, len_tmp);
1108 /* try to use a trusted value for len_full */
1109 if (len_full < len_max)
1110 len_full = (encode ?
1111 len_tmp * 2 : len_tmp);
1112 p += len_tmp + 1;
1113 }
1114 len_buf += len_tmp;
1115 buf_head[len_buf] = '\0';
1116
1117 /* length of the buffer in the audit record? */
1118 len_abuf = (encode ? len_buf * 2 : len_buf + 2);
1119 }
1120
1121 /* write as much as we can to the audit log */
1122 if (len_buf >= 0) {
1123 /* NOTE: some magic numbers here - basically if we
1124 * can't fit a reasonable amount of data into the
1125 * existing audit buffer, flush it and start with
1126 * a new buffer */
1127 if ((sizeof(abuf) + 8) > len_rem) {
1128 len_rem = len_max;
1129 audit_log_end(*ab);
1130 *ab = audit_log_start(context,
1131 GFP_KERNEL, AUDIT_EXECVE);
1132 if (!*ab)
1133 goto out;
1134 }
1135
1136 /* create the non-arg portion of the arg record */
1137 len_tmp = 0;
1138 if (require_data || (iter > 0) ||
1139 ((len_abuf + sizeof(abuf)) > len_rem)) {
1140 if (iter == 0) {
1141 len_tmp += snprintf(&abuf[len_tmp],
1142 sizeof(abuf) - len_tmp,
1143 " a%d_len=%lu",
1144 arg, len_full);
1145 }
1146 len_tmp += snprintf(&abuf[len_tmp],
1147 sizeof(abuf) - len_tmp,
1148 " a%d[%d]=", arg, iter++);
1149 } else
1150 len_tmp += snprintf(&abuf[len_tmp],
1151 sizeof(abuf) - len_tmp,
1152 " a%d=", arg);
1153 WARN_ON(len_tmp >= sizeof(abuf));
1154 abuf[sizeof(abuf) - 1] = '\0';
1155
1156 /* log the arg in the audit record */
1157 audit_log_format(*ab, "%s", abuf);
1158 len_rem -= len_tmp;
1159 len_tmp = len_buf;
1160 if (encode) {
1161 if (len_abuf > len_rem)
1162 len_tmp = len_rem / 2; /* encoding */
1163 audit_log_n_hex(*ab, buf, len_tmp);
1164 len_rem -= len_tmp * 2;
1165 len_abuf -= len_tmp * 2;
1166 } else {
1167 if (len_abuf > len_rem)
1168 len_tmp = len_rem - 2; /* quotes */
1169 audit_log_n_string(*ab, buf, len_tmp);
1170 len_rem -= len_tmp + 2;
1171 /* don't subtract the "2" because we still need
1172 * to add quotes to the remaining string */
1173 len_abuf -= len_tmp;
1174 }
1175 len_buf -= len_tmp;
1176 buf += len_tmp;
1177 }
1178
1179 /* ready to move to the next argument? */
1180 if ((len_buf == 0) && !require_data) {
1181 arg++;
1182 iter = 0;
1183 len_full = 0;
1184 require_data = true;
1185 encode = false;
1186 }
1187 } while (arg < context->execve.argc);
1188
1189 /* NOTE: the caller handles the final audit_log_end() call */
1190
1191out:
1192 kfree(buf_head);
1193}
1194
1195static void audit_log_cap(struct audit_buffer *ab, char *prefix,
1196 kernel_cap_t *cap)
1197{
1198 int i;
1199
1200 if (cap_isclear(*cap)) {
1201 audit_log_format(ab, " %s=0", prefix);
1202 return;
1203 }
1204 audit_log_format(ab, " %s=", prefix);
1205 CAP_FOR_EACH_U32(i)
1206 audit_log_format(ab, "%08x", cap->cap[CAP_LAST_U32 - i]);
1207}
1208
1209static void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name)
1210{
1211 if (name->fcap_ver == -1) {
1212 audit_log_format(ab, " cap_fe=? cap_fver=? cap_fp=? cap_fi=?");
1213 return;
1214 }
1215 audit_log_cap(ab, "cap_fp", &name->fcap.permitted);
1216 audit_log_cap(ab, "cap_fi", &name->fcap.inheritable);
1217 audit_log_format(ab, " cap_fe=%d cap_fver=%x cap_frootid=%d",
1218 name->fcap.fE, name->fcap_ver,
1219 from_kuid(&init_user_ns, name->fcap.rootid));
1220}
1221
1222static void show_special(struct audit_context *context, int *call_panic)
1223{
1224 struct audit_buffer *ab;
1225 int i;
1226
1227 ab = audit_log_start(context, GFP_KERNEL, context->type);
1228 if (!ab)
1229 return;
1230
1231 switch (context->type) {
1232 case AUDIT_SOCKETCALL: {
1233 int nargs = context->socketcall.nargs;
1234
1235 audit_log_format(ab, "nargs=%d", nargs);
1236 for (i = 0; i < nargs; i++)
1237 audit_log_format(ab, " a%d=%lx", i,
1238 context->socketcall.args[i]);
1239 break; }
1240 case AUDIT_IPC: {
1241 u32 osid = context->ipc.osid;
1242
1243 audit_log_format(ab, "ouid=%u ogid=%u mode=%#ho",
1244 from_kuid(&init_user_ns, context->ipc.uid),
1245 from_kgid(&init_user_ns, context->ipc.gid),
1246 context->ipc.mode);
1247 if (osid) {
1248 char *ctx = NULL;
1249 u32 len;
1250
1251 if (security_secid_to_secctx(osid, &ctx, &len)) {
1252 audit_log_format(ab, " osid=%u", osid);
1253 *call_panic = 1;
1254 } else {
1255 audit_log_format(ab, " obj=%s", ctx);
1256 security_release_secctx(ctx, len);
1257 }
1258 }
1259 if (context->ipc.has_perm) {
1260 audit_log_end(ab);
1261 ab = audit_log_start(context, GFP_KERNEL,
1262 AUDIT_IPC_SET_PERM);
1263 if (unlikely(!ab))
1264 return;
1265 audit_log_format(ab,
1266 "qbytes=%lx ouid=%u ogid=%u mode=%#ho",
1267 context->ipc.qbytes,
1268 context->ipc.perm_uid,
1269 context->ipc.perm_gid,
1270 context->ipc.perm_mode);
1271 }
1272 break; }
1273 case AUDIT_MQ_OPEN:
1274 audit_log_format(ab,
1275 "oflag=0x%x mode=%#ho mq_flags=0x%lx mq_maxmsg=%ld "
1276 "mq_msgsize=%ld mq_curmsgs=%ld",
1277 context->mq_open.oflag, context->mq_open.mode,
1278 context->mq_open.attr.mq_flags,
1279 context->mq_open.attr.mq_maxmsg,
1280 context->mq_open.attr.mq_msgsize,
1281 context->mq_open.attr.mq_curmsgs);
1282 break;
1283 case AUDIT_MQ_SENDRECV:
1284 audit_log_format(ab,
1285 "mqdes=%d msg_len=%zd msg_prio=%u "
1286 "abs_timeout_sec=%lld abs_timeout_nsec=%ld",
1287 context->mq_sendrecv.mqdes,
1288 context->mq_sendrecv.msg_len,
1289 context->mq_sendrecv.msg_prio,
1290 (long long) context->mq_sendrecv.abs_timeout.tv_sec,
1291 context->mq_sendrecv.abs_timeout.tv_nsec);
1292 break;
1293 case AUDIT_MQ_NOTIFY:
1294 audit_log_format(ab, "mqdes=%d sigev_signo=%d",
1295 context->mq_notify.mqdes,
1296 context->mq_notify.sigev_signo);
1297 break;
1298 case AUDIT_MQ_GETSETATTR: {
1299 struct mq_attr *attr = &context->mq_getsetattr.mqstat;
1300
1301 audit_log_format(ab,
1302 "mqdes=%d mq_flags=0x%lx mq_maxmsg=%ld mq_msgsize=%ld "
1303 "mq_curmsgs=%ld ",
1304 context->mq_getsetattr.mqdes,
1305 attr->mq_flags, attr->mq_maxmsg,
1306 attr->mq_msgsize, attr->mq_curmsgs);
1307 break; }
1308 case AUDIT_CAPSET:
1309 audit_log_format(ab, "pid=%d", context->capset.pid);
1310 audit_log_cap(ab, "cap_pi", &context->capset.cap.inheritable);
1311 audit_log_cap(ab, "cap_pp", &context->capset.cap.permitted);
1312 audit_log_cap(ab, "cap_pe", &context->capset.cap.effective);
1313 audit_log_cap(ab, "cap_pa", &context->capset.cap.ambient);
1314 break;
1315 case AUDIT_MMAP:
1316 audit_log_format(ab, "fd=%d flags=0x%x", context->mmap.fd,
1317 context->mmap.flags);
1318 break;
1319 case AUDIT_EXECVE:
1320 audit_log_execve_info(context, &ab);
1321 break;
1322 case AUDIT_KERN_MODULE:
1323 audit_log_format(ab, "name=");
1324 if (context->module.name) {
1325 audit_log_untrustedstring(ab, context->module.name);
1326 } else
1327 audit_log_format(ab, "(null)");
1328
1329 break;
1330 }
1331 audit_log_end(ab);
1332}
1333
1334static inline int audit_proctitle_rtrim(char *proctitle, int len)
1335{
1336 char *end = proctitle + len - 1;
1337
1338 while (end > proctitle && !isprint(*end))
1339 end--;
1340
1341 /* catch the case where proctitle is only 1 non-print character */
1342 len = end - proctitle + 1;
1343 len -= isprint(proctitle[len-1]) == 0;
1344 return len;
1345}
1346
1347/*
1348 * audit_log_name - produce AUDIT_PATH record from struct audit_names
1349 * @context: audit_context for the task
1350 * @n: audit_names structure with reportable details
1351 * @path: optional path to report instead of audit_names->name
1352 * @record_num: record number to report when handling a list of names
1353 * @call_panic: optional pointer to int that will be updated if secid fails
1354 */
1355static void audit_log_name(struct audit_context *context, struct audit_names *n,
1356 const struct path *path, int record_num, int *call_panic)
1357{
1358 struct audit_buffer *ab;
1359
1360 ab = audit_log_start(context, GFP_KERNEL, AUDIT_PATH);
1361 if (!ab)
1362 return;
1363
1364 audit_log_format(ab, "item=%d", record_num);
1365
1366 if (path)
1367 audit_log_d_path(ab, " name=", path);
1368 else if (n->name) {
1369 switch (n->name_len) {
1370 case AUDIT_NAME_FULL:
1371 /* log the full path */
1372 audit_log_format(ab, " name=");
1373 audit_log_untrustedstring(ab, n->name->name);
1374 break;
1375 case 0:
1376 /* name was specified as a relative path and the
1377 * directory component is the cwd
1378 */
1379 if (context->pwd.dentry && context->pwd.mnt)
1380 audit_log_d_path(ab, " name=", &context->pwd);
1381 else
1382 audit_log_format(ab, " name=(null)");
1383 break;
1384 default:
1385 /* log the name's directory component */
1386 audit_log_format(ab, " name=");
1387 audit_log_n_untrustedstring(ab, n->name->name,
1388 n->name_len);
1389 }
1390 } else
1391 audit_log_format(ab, " name=(null)");
1392
1393 if (n->ino != AUDIT_INO_UNSET)
1394 audit_log_format(ab, " inode=%lu dev=%02x:%02x mode=%#ho ouid=%u ogid=%u rdev=%02x:%02x",
1395 n->ino,
1396 MAJOR(n->dev),
1397 MINOR(n->dev),
1398 n->mode,
1399 from_kuid(&init_user_ns, n->uid),
1400 from_kgid(&init_user_ns, n->gid),
1401 MAJOR(n->rdev),
1402 MINOR(n->rdev));
1403 if (n->osid != 0) {
1404 char *ctx = NULL;
1405 u32 len;
1406
1407 if (security_secid_to_secctx(
1408 n->osid, &ctx, &len)) {
1409 audit_log_format(ab, " osid=%u", n->osid);
1410 if (call_panic)
1411 *call_panic = 2;
1412 } else {
1413 audit_log_format(ab, " obj=%s", ctx);
1414 security_release_secctx(ctx, len);
1415 }
1416 }
1417
1418 /* log the audit_names record type */
1419 switch (n->type) {
1420 case AUDIT_TYPE_NORMAL:
1421 audit_log_format(ab, " nametype=NORMAL");
1422 break;
1423 case AUDIT_TYPE_PARENT:
1424 audit_log_format(ab, " nametype=PARENT");
1425 break;
1426 case AUDIT_TYPE_CHILD_DELETE:
1427 audit_log_format(ab, " nametype=DELETE");
1428 break;
1429 case AUDIT_TYPE_CHILD_CREATE:
1430 audit_log_format(ab, " nametype=CREATE");
1431 break;
1432 default:
1433 audit_log_format(ab, " nametype=UNKNOWN");
1434 break;
1435 }
1436
1437 audit_log_fcaps(ab, n);
1438 audit_log_end(ab);
1439}
1440
1441static void audit_log_proctitle(void)
1442{
1443 int res;
1444 char *buf;
1445 char *msg = "(null)";
1446 int len = strlen(msg);
1447 struct audit_context *context = audit_context();
1448 struct audit_buffer *ab;
1449
1450 ab = audit_log_start(context, GFP_KERNEL, AUDIT_PROCTITLE);
1451 if (!ab)
1452 return; /* audit_panic or being filtered */
1453
1454 audit_log_format(ab, "proctitle=");
1455
1456 /* Not cached */
1457 if (!context->proctitle.value) {
1458 buf = kmalloc(MAX_PROCTITLE_AUDIT_LEN, GFP_KERNEL);
1459 if (!buf)
1460 goto out;
1461 /* Historically called this from procfs naming */
1462 res = get_cmdline(current, buf, MAX_PROCTITLE_AUDIT_LEN);
1463 if (res == 0) {
1464 kfree(buf);
1465 goto out;
1466 }
1467 res = audit_proctitle_rtrim(buf, res);
1468 if (res == 0) {
1469 kfree(buf);
1470 goto out;
1471 }
1472 context->proctitle.value = buf;
1473 context->proctitle.len = res;
1474 }
1475 msg = context->proctitle.value;
1476 len = context->proctitle.len;
1477out:
1478 audit_log_n_untrustedstring(ab, msg, len);
1479 audit_log_end(ab);
1480}
1481
1482static void audit_log_exit(void)
1483{
1484 int i, call_panic = 0;
1485 struct audit_context *context = audit_context();
1486 struct audit_buffer *ab;
1487 struct audit_aux_data *aux;
1488 struct audit_names *n;
1489
1490 context->personality = current->personality;
1491
1492 ab = audit_log_start(context, GFP_KERNEL, AUDIT_SYSCALL);
1493 if (!ab)
1494 return; /* audit_panic has been called */
1495 audit_log_format(ab, "arch=%x syscall=%d",
1496 context->arch, context->major);
1497 if (context->personality != PER_LINUX)
1498 audit_log_format(ab, " per=%lx", context->personality);
1499 if (context->return_valid != AUDITSC_INVALID)
1500 audit_log_format(ab, " success=%s exit=%ld",
1501 (context->return_valid==AUDITSC_SUCCESS)?"yes":"no",
1502 context->return_code);
1503
1504 audit_log_format(ab,
1505 " a0=%lx a1=%lx a2=%lx a3=%lx items=%d",
1506 context->argv[0],
1507 context->argv[1],
1508 context->argv[2],
1509 context->argv[3],
1510 context->name_count);
1511
1512 audit_log_task_info(ab);
1513 audit_log_key(ab, context->filterkey);
1514 audit_log_end(ab);
1515
1516 for (aux = context->aux; aux; aux = aux->next) {
1517
1518 ab = audit_log_start(context, GFP_KERNEL, aux->type);
1519 if (!ab)
1520 continue; /* audit_panic has been called */
1521
1522 switch (aux->type) {
1523
1524 case AUDIT_BPRM_FCAPS: {
1525 struct audit_aux_data_bprm_fcaps *axs = (void *)aux;
1526
1527 audit_log_format(ab, "fver=%x", axs->fcap_ver);
1528 audit_log_cap(ab, "fp", &axs->fcap.permitted);
1529 audit_log_cap(ab, "fi", &axs->fcap.inheritable);
1530 audit_log_format(ab, " fe=%d", axs->fcap.fE);
1531 audit_log_cap(ab, "old_pp", &axs->old_pcap.permitted);
1532 audit_log_cap(ab, "old_pi", &axs->old_pcap.inheritable);
1533 audit_log_cap(ab, "old_pe", &axs->old_pcap.effective);
1534 audit_log_cap(ab, "old_pa", &axs->old_pcap.ambient);
1535 audit_log_cap(ab, "pp", &axs->new_pcap.permitted);
1536 audit_log_cap(ab, "pi", &axs->new_pcap.inheritable);
1537 audit_log_cap(ab, "pe", &axs->new_pcap.effective);
1538 audit_log_cap(ab, "pa", &axs->new_pcap.ambient);
1539 audit_log_format(ab, " frootid=%d",
1540 from_kuid(&init_user_ns,
1541 axs->fcap.rootid));
1542 break; }
1543
1544 }
1545 audit_log_end(ab);
1546 }
1547
1548 if (context->type)
1549 show_special(context, &call_panic);
1550
1551 if (context->fds[0] >= 0) {
1552 ab = audit_log_start(context, GFP_KERNEL, AUDIT_FD_PAIR);
1553 if (ab) {
1554 audit_log_format(ab, "fd0=%d fd1=%d",
1555 context->fds[0], context->fds[1]);
1556 audit_log_end(ab);
1557 }
1558 }
1559
1560 if (context->sockaddr_len) {
1561 ab = audit_log_start(context, GFP_KERNEL, AUDIT_SOCKADDR);
1562 if (ab) {
1563 audit_log_format(ab, "saddr=");
1564 audit_log_n_hex(ab, (void *)context->sockaddr,
1565 context->sockaddr_len);
1566 audit_log_end(ab);
1567 }
1568 }
1569
1570 for (aux = context->aux_pids; aux; aux = aux->next) {
1571 struct audit_aux_data_pids *axs = (void *)aux;
1572
1573 for (i = 0; i < axs->pid_count; i++)
1574 if (audit_log_pid_context(context, axs->target_pid[i],
1575 axs->target_auid[i],
1576 axs->target_uid[i],
1577 axs->target_sessionid[i],
1578 axs->target_sid[i],
1579 axs->target_comm[i]))
1580 call_panic = 1;
1581 }
1582
1583 if (context->target_pid &&
1584 audit_log_pid_context(context, context->target_pid,
1585 context->target_auid, context->target_uid,
1586 context->target_sessionid,
1587 context->target_sid, context->target_comm))
1588 call_panic = 1;
1589
1590 if (context->pwd.dentry && context->pwd.mnt) {
1591 ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD);
1592 if (ab) {
1593 audit_log_d_path(ab, "cwd=", &context->pwd);
1594 audit_log_end(ab);
1595 }
1596 }
1597
1598 i = 0;
1599 list_for_each_entry(n, &context->names_list, list) {
1600 if (n->hidden)
1601 continue;
1602 audit_log_name(context, n, NULL, i++, &call_panic);
1603 }
1604
1605 audit_log_proctitle();
1606
1607 /* Send end of event record to help user space know we are finished */
1608 ab = audit_log_start(context, GFP_KERNEL, AUDIT_EOE);
1609 if (ab)
1610 audit_log_end(ab);
1611 if (call_panic)
1612 audit_panic("error converting sid to string");
1613}
1614
1615/**
1616 * __audit_free - free a per-task audit context
1617 * @tsk: task whose audit context block to free
1618 *
1619 * Called from copy_process and do_exit
1620 */
1621void __audit_free(struct task_struct *tsk)
1622{
1623 struct audit_context *context = tsk->audit_context;
1624
1625 if (!context)
1626 return;
1627
1628 if (!list_empty(&context->killed_trees))
1629 audit_kill_trees(context);
1630
1631 /* We are called either by do_exit() or the fork() error handling code;
1632 * in the former case tsk == current and in the latter tsk is a
1633 * random task_struct that doesn't doesn't have any meaningful data we
1634 * need to log via audit_log_exit().
1635 */
1636 if (tsk == current && !context->dummy && context->in_syscall) {
1637 context->return_valid = AUDITSC_INVALID;
1638 context->return_code = 0;
1639
1640 audit_filter_syscall(tsk, context);
1641 audit_filter_inodes(tsk, context);
1642 if (context->current_state == AUDIT_STATE_RECORD)
1643 audit_log_exit();
1644 }
1645
1646 audit_set_context(tsk, NULL);
1647 audit_free_context(context);
1648}
1649
1650/**
1651 * __audit_syscall_entry - fill in an audit record at syscall entry
1652 * @major: major syscall type (function)
1653 * @a1: additional syscall register 1
1654 * @a2: additional syscall register 2
1655 * @a3: additional syscall register 3
1656 * @a4: additional syscall register 4
1657 *
1658 * Fill in audit context at syscall entry. This only happens if the
1659 * audit context was created when the task was created and the state or
1660 * filters demand the audit context be built. If the state from the
1661 * per-task filter or from the per-syscall filter is AUDIT_STATE_RECORD,
1662 * then the record will be written at syscall exit time (otherwise, it
1663 * will only be written if another part of the kernel requests that it
1664 * be written).
1665 */
1666void __audit_syscall_entry(int major, unsigned long a1, unsigned long a2,
1667 unsigned long a3, unsigned long a4)
1668{
1669 struct audit_context *context = audit_context();
1670 enum audit_state state;
1671
1672 if (!audit_enabled || !context)
1673 return;
1674
1675 BUG_ON(context->in_syscall || context->name_count);
1676
1677 state = context->state;
1678 if (state == AUDIT_STATE_DISABLED)
1679 return;
1680
1681 context->dummy = !audit_n_rules;
1682 if (!context->dummy && state == AUDIT_STATE_BUILD) {
1683 context->prio = 0;
1684 if (auditd_test_task(current))
1685 return;
1686 }
1687
1688 context->arch = syscall_get_arch(current);
1689 context->major = major;
1690 context->argv[0] = a1;
1691 context->argv[1] = a2;
1692 context->argv[2] = a3;
1693 context->argv[3] = a4;
1694 context->serial = 0;
1695 context->in_syscall = 1;
1696 context->current_state = state;
1697 context->ppid = 0;
1698 ktime_get_coarse_real_ts64(&context->ctime);
1699}
1700
1701/**
1702 * __audit_syscall_exit - deallocate audit context after a system call
1703 * @success: success value of the syscall
1704 * @return_code: return value of the syscall
1705 *
1706 * Tear down after system call. If the audit context has been marked as
1707 * auditable (either because of the AUDIT_STATE_RECORD state from
1708 * filtering, or because some other part of the kernel wrote an audit
1709 * message), then write out the syscall information. In call cases,
1710 * free the names stored from getname().
1711 */
1712void __audit_syscall_exit(int success, long return_code)
1713{
1714 struct audit_context *context;
1715
1716 context = audit_context();
1717 if (!context)
1718 return;
1719
1720 if (!list_empty(&context->killed_trees))
1721 audit_kill_trees(context);
1722
1723 if (!context->dummy && context->in_syscall) {
1724 if (success)
1725 context->return_valid = AUDITSC_SUCCESS;
1726 else
1727 context->return_valid = AUDITSC_FAILURE;
1728
1729 /*
1730 * we need to fix up the return code in the audit logs if the
1731 * actual return codes are later going to be fixed up by the
1732 * arch specific signal handlers
1733 *
1734 * This is actually a test for:
1735 * (rc == ERESTARTSYS ) || (rc == ERESTARTNOINTR) ||
1736 * (rc == ERESTARTNOHAND) || (rc == ERESTART_RESTARTBLOCK)
1737 *
1738 * but is faster than a bunch of ||
1739 */
1740 if (unlikely(return_code <= -ERESTARTSYS) &&
1741 (return_code >= -ERESTART_RESTARTBLOCK) &&
1742 (return_code != -ENOIOCTLCMD))
1743 context->return_code = -EINTR;
1744 else
1745 context->return_code = return_code;
1746
1747 audit_filter_syscall(current, context);
1748 audit_filter_inodes(current, context);
1749 if (context->current_state == AUDIT_STATE_RECORD)
1750 audit_log_exit();
1751 }
1752
1753 context->in_syscall = 0;
1754 context->prio = context->state == AUDIT_STATE_RECORD ? ~0ULL : 0;
1755
1756 audit_free_module(context);
1757 audit_free_names(context);
1758 unroll_tree_refs(context, NULL, 0);
1759 audit_free_aux(context);
1760 context->aux = NULL;
1761 context->aux_pids = NULL;
1762 context->target_pid = 0;
1763 context->target_sid = 0;
1764 context->sockaddr_len = 0;
1765 context->type = 0;
1766 context->fds[0] = -1;
1767 if (context->state != AUDIT_STATE_RECORD) {
1768 kfree(context->filterkey);
1769 context->filterkey = NULL;
1770 }
1771}
1772
1773static inline void handle_one(const struct inode *inode)
1774{
1775 struct audit_context *context;
1776 struct audit_tree_refs *p;
1777 struct audit_chunk *chunk;
1778 int count;
1779
1780 if (likely(!inode->i_fsnotify_marks))
1781 return;
1782 context = audit_context();
1783 p = context->trees;
1784 count = context->tree_count;
1785 rcu_read_lock();
1786 chunk = audit_tree_lookup(inode);
1787 rcu_read_unlock();
1788 if (!chunk)
1789 return;
1790 if (likely(put_tree_ref(context, chunk)))
1791 return;
1792 if (unlikely(!grow_tree_refs(context))) {
1793 pr_warn("out of memory, audit has lost a tree reference\n");
1794 audit_set_auditable(context);
1795 audit_put_chunk(chunk);
1796 unroll_tree_refs(context, p, count);
1797 return;
1798 }
1799 put_tree_ref(context, chunk);
1800}
1801
1802static void handle_path(const struct dentry *dentry)
1803{
1804 struct audit_context *context;
1805 struct audit_tree_refs *p;
1806 const struct dentry *d, *parent;
1807 struct audit_chunk *drop;
1808 unsigned long seq;
1809 int count;
1810
1811 context = audit_context();
1812 p = context->trees;
1813 count = context->tree_count;
1814retry:
1815 drop = NULL;
1816 d = dentry;
1817 rcu_read_lock();
1818 seq = read_seqbegin(&rename_lock);
1819 for(;;) {
1820 struct inode *inode = d_backing_inode(d);
1821
1822 if (inode && unlikely(inode->i_fsnotify_marks)) {
1823 struct audit_chunk *chunk;
1824
1825 chunk = audit_tree_lookup(inode);
1826 if (chunk) {
1827 if (unlikely(!put_tree_ref(context, chunk))) {
1828 drop = chunk;
1829 break;
1830 }
1831 }
1832 }
1833 parent = d->d_parent;
1834 if (parent == d)
1835 break;
1836 d = parent;
1837 }
1838 if (unlikely(read_seqretry(&rename_lock, seq) || drop)) { /* in this order */
1839 rcu_read_unlock();
1840 if (!drop) {
1841 /* just a race with rename */
1842 unroll_tree_refs(context, p, count);
1843 goto retry;
1844 }
1845 audit_put_chunk(drop);
1846 if (grow_tree_refs(context)) {
1847 /* OK, got more space */
1848 unroll_tree_refs(context, p, count);
1849 goto retry;
1850 }
1851 /* too bad */
1852 pr_warn("out of memory, audit has lost a tree reference\n");
1853 unroll_tree_refs(context, p, count);
1854 audit_set_auditable(context);
1855 return;
1856 }
1857 rcu_read_unlock();
1858}
1859
1860static struct audit_names *audit_alloc_name(struct audit_context *context,
1861 unsigned char type)
1862{
1863 struct audit_names *aname;
1864
1865 if (context->name_count < AUDIT_NAMES) {
1866 aname = &context->preallocated_names[context->name_count];
1867 memset(aname, 0, sizeof(*aname));
1868 } else {
1869 aname = kzalloc(sizeof(*aname), GFP_NOFS);
1870 if (!aname)
1871 return NULL;
1872 aname->should_free = true;
1873 }
1874
1875 aname->ino = AUDIT_INO_UNSET;
1876 aname->type = type;
1877 list_add_tail(&aname->list, &context->names_list);
1878
1879 context->name_count++;
1880 if (!context->pwd.dentry)
1881 get_fs_pwd(current->fs, &context->pwd);
1882 return aname;
1883}
1884
1885/**
1886 * __audit_reusename - fill out filename with info from existing entry
1887 * @uptr: userland ptr to pathname
1888 *
1889 * Search the audit_names list for the current audit context. If there is an
1890 * existing entry with a matching "uptr" then return the filename
1891 * associated with that audit_name. If not, return NULL.
1892 */
1893struct filename *
1894__audit_reusename(const __user char *uptr)
1895{
1896 struct audit_context *context = audit_context();
1897 struct audit_names *n;
1898
1899 list_for_each_entry(n, &context->names_list, list) {
1900 if (!n->name)
1901 continue;
1902 if (n->name->uptr == uptr) {
1903 n->name->refcnt++;
1904 return n->name;
1905 }
1906 }
1907 return NULL;
1908}
1909
1910/**
1911 * __audit_getname - add a name to the list
1912 * @name: name to add
1913 *
1914 * Add a name to the list of audit names for this context.
1915 * Called from fs/namei.c:getname().
1916 */
1917void __audit_getname(struct filename *name)
1918{
1919 struct audit_context *context = audit_context();
1920 struct audit_names *n;
1921
1922 if (!context->in_syscall)
1923 return;
1924
1925 n = audit_alloc_name(context, AUDIT_TYPE_UNKNOWN);
1926 if (!n)
1927 return;
1928
1929 n->name = name;
1930 n->name_len = AUDIT_NAME_FULL;
1931 name->aname = n;
1932 name->refcnt++;
1933}
1934
1935static inline int audit_copy_fcaps(struct audit_names *name,
1936 const struct dentry *dentry)
1937{
1938 struct cpu_vfs_cap_data caps;
1939 int rc;
1940
1941 if (!dentry)
1942 return 0;
1943
1944 rc = get_vfs_caps_from_disk(&init_user_ns, dentry, &caps);
1945 if (rc)
1946 return rc;
1947
1948 name->fcap.permitted = caps.permitted;
1949 name->fcap.inheritable = caps.inheritable;
1950 name->fcap.fE = !!(caps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE);
1951 name->fcap.rootid = caps.rootid;
1952 name->fcap_ver = (caps.magic_etc & VFS_CAP_REVISION_MASK) >>
1953 VFS_CAP_REVISION_SHIFT;
1954
1955 return 0;
1956}
1957
1958/* Copy inode data into an audit_names. */
1959static void audit_copy_inode(struct audit_names *name,
1960 const struct dentry *dentry,
1961 struct inode *inode, unsigned int flags)
1962{
1963 name->ino = inode->i_ino;
1964 name->dev = inode->i_sb->s_dev;
1965 name->mode = inode->i_mode;
1966 name->uid = inode->i_uid;
1967 name->gid = inode->i_gid;
1968 name->rdev = inode->i_rdev;
1969 security_inode_getsecid(inode, &name->osid);
1970 if (flags & AUDIT_INODE_NOEVAL) {
1971 name->fcap_ver = -1;
1972 return;
1973 }
1974 audit_copy_fcaps(name, dentry);
1975}
1976
1977/**
1978 * __audit_inode - store the inode and device from a lookup
1979 * @name: name being audited
1980 * @dentry: dentry being audited
1981 * @flags: attributes for this particular entry
1982 */
1983void __audit_inode(struct filename *name, const struct dentry *dentry,
1984 unsigned int flags)
1985{
1986 struct audit_context *context = audit_context();
1987 struct inode *inode = d_backing_inode(dentry);
1988 struct audit_names *n;
1989 bool parent = flags & AUDIT_INODE_PARENT;
1990 struct audit_entry *e;
1991 struct list_head *list = &audit_filter_list[AUDIT_FILTER_FS];
1992 int i;
1993
1994 if (!context->in_syscall)
1995 return;
1996
1997 rcu_read_lock();
1998 list_for_each_entry_rcu(e, list, list) {
1999 for (i = 0; i < e->rule.field_count; i++) {
2000 struct audit_field *f = &e->rule.fields[i];
2001
2002 if (f->type == AUDIT_FSTYPE
2003 && audit_comparator(inode->i_sb->s_magic,
2004 f->op, f->val)
2005 && e->rule.action == AUDIT_NEVER) {
2006 rcu_read_unlock();
2007 return;
2008 }
2009 }
2010 }
2011 rcu_read_unlock();
2012
2013 if (!name)
2014 goto out_alloc;
2015
2016 /*
2017 * If we have a pointer to an audit_names entry already, then we can
2018 * just use it directly if the type is correct.
2019 */
2020 n = name->aname;
2021 if (n) {
2022 if (parent) {
2023 if (n->type == AUDIT_TYPE_PARENT ||
2024 n->type == AUDIT_TYPE_UNKNOWN)
2025 goto out;
2026 } else {
2027 if (n->type != AUDIT_TYPE_PARENT)
2028 goto out;
2029 }
2030 }
2031
2032 list_for_each_entry_reverse(n, &context->names_list, list) {
2033 if (n->ino) {
2034 /* valid inode number, use that for the comparison */
2035 if (n->ino != inode->i_ino ||
2036 n->dev != inode->i_sb->s_dev)
2037 continue;
2038 } else if (n->name) {
2039 /* inode number has not been set, check the name */
2040 if (strcmp(n->name->name, name->name))
2041 continue;
2042 } else
2043 /* no inode and no name (?!) ... this is odd ... */
2044 continue;
2045
2046 /* match the correct record type */
2047 if (parent) {
2048 if (n->type == AUDIT_TYPE_PARENT ||
2049 n->type == AUDIT_TYPE_UNKNOWN)
2050 goto out;
2051 } else {
2052 if (n->type != AUDIT_TYPE_PARENT)
2053 goto out;
2054 }
2055 }
2056
2057out_alloc:
2058 /* unable to find an entry with both a matching name and type */
2059 n = audit_alloc_name(context, AUDIT_TYPE_UNKNOWN);
2060 if (!n)
2061 return;
2062 if (name) {
2063 n->name = name;
2064 name->refcnt++;
2065 }
2066
2067out:
2068 if (parent) {
2069 n->name_len = n->name ? parent_len(n->name->name) : AUDIT_NAME_FULL;
2070 n->type = AUDIT_TYPE_PARENT;
2071 if (flags & AUDIT_INODE_HIDDEN)
2072 n->hidden = true;
2073 } else {
2074 n->name_len = AUDIT_NAME_FULL;
2075 n->type = AUDIT_TYPE_NORMAL;
2076 }
2077 handle_path(dentry);
2078 audit_copy_inode(n, dentry, inode, flags & AUDIT_INODE_NOEVAL);
2079}
2080
2081void __audit_file(const struct file *file)
2082{
2083 __audit_inode(NULL, file->f_path.dentry, 0);
2084}
2085
2086/**
2087 * __audit_inode_child - collect inode info for created/removed objects
2088 * @parent: inode of dentry parent
2089 * @dentry: dentry being audited
2090 * @type: AUDIT_TYPE_* value that we're looking for
2091 *
2092 * For syscalls that create or remove filesystem objects, audit_inode
2093 * can only collect information for the filesystem object's parent.
2094 * This call updates the audit context with the child's information.
2095 * Syscalls that create a new filesystem object must be hooked after
2096 * the object is created. Syscalls that remove a filesystem object
2097 * must be hooked prior, in order to capture the target inode during
2098 * unsuccessful attempts.
2099 */
2100void __audit_inode_child(struct inode *parent,
2101 const struct dentry *dentry,
2102 const unsigned char type)
2103{
2104 struct audit_context *context = audit_context();
2105 struct inode *inode = d_backing_inode(dentry);
2106 const struct qstr *dname = &dentry->d_name;
2107 struct audit_names *n, *found_parent = NULL, *found_child = NULL;
2108 struct audit_entry *e;
2109 struct list_head *list = &audit_filter_list[AUDIT_FILTER_FS];
2110 int i;
2111
2112 if (!context->in_syscall)
2113 return;
2114
2115 rcu_read_lock();
2116 list_for_each_entry_rcu(e, list, list) {
2117 for (i = 0; i < e->rule.field_count; i++) {
2118 struct audit_field *f = &e->rule.fields[i];
2119
2120 if (f->type == AUDIT_FSTYPE
2121 && audit_comparator(parent->i_sb->s_magic,
2122 f->op, f->val)
2123 && e->rule.action == AUDIT_NEVER) {
2124 rcu_read_unlock();
2125 return;
2126 }
2127 }
2128 }
2129 rcu_read_unlock();
2130
2131 if (inode)
2132 handle_one(inode);
2133
2134 /* look for a parent entry first */
2135 list_for_each_entry(n, &context->names_list, list) {
2136 if (!n->name ||
2137 (n->type != AUDIT_TYPE_PARENT &&
2138 n->type != AUDIT_TYPE_UNKNOWN))
2139 continue;
2140
2141 if (n->ino == parent->i_ino && n->dev == parent->i_sb->s_dev &&
2142 !audit_compare_dname_path(dname,
2143 n->name->name, n->name_len)) {
2144 if (n->type == AUDIT_TYPE_UNKNOWN)
2145 n->type = AUDIT_TYPE_PARENT;
2146 found_parent = n;
2147 break;
2148 }
2149 }
2150
2151 /* is there a matching child entry? */
2152 list_for_each_entry(n, &context->names_list, list) {
2153 /* can only match entries that have a name */
2154 if (!n->name ||
2155 (n->type != type && n->type != AUDIT_TYPE_UNKNOWN))
2156 continue;
2157
2158 if (!strcmp(dname->name, n->name->name) ||
2159 !audit_compare_dname_path(dname, n->name->name,
2160 found_parent ?
2161 found_parent->name_len :
2162 AUDIT_NAME_FULL)) {
2163 if (n->type == AUDIT_TYPE_UNKNOWN)
2164 n->type = type;
2165 found_child = n;
2166 break;
2167 }
2168 }
2169
2170 if (!found_parent) {
2171 /* create a new, "anonymous" parent record */
2172 n = audit_alloc_name(context, AUDIT_TYPE_PARENT);
2173 if (!n)
2174 return;
2175 audit_copy_inode(n, NULL, parent, 0);
2176 }
2177
2178 if (!found_child) {
2179 found_child = audit_alloc_name(context, type);
2180 if (!found_child)
2181 return;
2182
2183 /* Re-use the name belonging to the slot for a matching parent
2184 * directory. All names for this context are relinquished in
2185 * audit_free_names() */
2186 if (found_parent) {
2187 found_child->name = found_parent->name;
2188 found_child->name_len = AUDIT_NAME_FULL;
2189 found_child->name->refcnt++;
2190 }
2191 }
2192
2193 if (inode)
2194 audit_copy_inode(found_child, dentry, inode, 0);
2195 else
2196 found_child->ino = AUDIT_INO_UNSET;
2197}
2198EXPORT_SYMBOL_GPL(__audit_inode_child);
2199
2200/**
2201 * auditsc_get_stamp - get local copies of audit_context values
2202 * @ctx: audit_context for the task
2203 * @t: timespec64 to store time recorded in the audit_context
2204 * @serial: serial value that is recorded in the audit_context
2205 *
2206 * Also sets the context as auditable.
2207 */
2208int auditsc_get_stamp(struct audit_context *ctx,
2209 struct timespec64 *t, unsigned int *serial)
2210{
2211 if (!ctx->in_syscall)
2212 return 0;
2213 if (!ctx->serial)
2214 ctx->serial = audit_serial();
2215 t->tv_sec = ctx->ctime.tv_sec;
2216 t->tv_nsec = ctx->ctime.tv_nsec;
2217 *serial = ctx->serial;
2218 if (!ctx->prio) {
2219 ctx->prio = 1;
2220 ctx->current_state = AUDIT_STATE_RECORD;
2221 }
2222 return 1;
2223}
2224
2225/**
2226 * __audit_mq_open - record audit data for a POSIX MQ open
2227 * @oflag: open flag
2228 * @mode: mode bits
2229 * @attr: queue attributes
2230 *
2231 */
2232void __audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr)
2233{
2234 struct audit_context *context = audit_context();
2235
2236 if (attr)
2237 memcpy(&context->mq_open.attr, attr, sizeof(struct mq_attr));
2238 else
2239 memset(&context->mq_open.attr, 0, sizeof(struct mq_attr));
2240
2241 context->mq_open.oflag = oflag;
2242 context->mq_open.mode = mode;
2243
2244 context->type = AUDIT_MQ_OPEN;
2245}
2246
2247/**
2248 * __audit_mq_sendrecv - record audit data for a POSIX MQ timed send/receive
2249 * @mqdes: MQ descriptor
2250 * @msg_len: Message length
2251 * @msg_prio: Message priority
2252 * @abs_timeout: Message timeout in absolute time
2253 *
2254 */
2255void __audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio,
2256 const struct timespec64 *abs_timeout)
2257{
2258 struct audit_context *context = audit_context();
2259 struct timespec64 *p = &context->mq_sendrecv.abs_timeout;
2260
2261 if (abs_timeout)
2262 memcpy(p, abs_timeout, sizeof(*p));
2263 else
2264 memset(p, 0, sizeof(*p));
2265
2266 context->mq_sendrecv.mqdes = mqdes;
2267 context->mq_sendrecv.msg_len = msg_len;
2268 context->mq_sendrecv.msg_prio = msg_prio;
2269
2270 context->type = AUDIT_MQ_SENDRECV;
2271}
2272
2273/**
2274 * __audit_mq_notify - record audit data for a POSIX MQ notify
2275 * @mqdes: MQ descriptor
2276 * @notification: Notification event
2277 *
2278 */
2279
2280void __audit_mq_notify(mqd_t mqdes, const struct sigevent *notification)
2281{
2282 struct audit_context *context = audit_context();
2283
2284 if (notification)
2285 context->mq_notify.sigev_signo = notification->sigev_signo;
2286 else
2287 context->mq_notify.sigev_signo = 0;
2288
2289 context->mq_notify.mqdes = mqdes;
2290 context->type = AUDIT_MQ_NOTIFY;
2291}
2292
2293/**
2294 * __audit_mq_getsetattr - record audit data for a POSIX MQ get/set attribute
2295 * @mqdes: MQ descriptor
2296 * @mqstat: MQ flags
2297 *
2298 */
2299void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
2300{
2301 struct audit_context *context = audit_context();
2302
2303 context->mq_getsetattr.mqdes = mqdes;
2304 context->mq_getsetattr.mqstat = *mqstat;
2305 context->type = AUDIT_MQ_GETSETATTR;
2306}
2307
2308/**
2309 * __audit_ipc_obj - record audit data for ipc object
2310 * @ipcp: ipc permissions
2311 *
2312 */
2313void __audit_ipc_obj(struct kern_ipc_perm *ipcp)
2314{
2315 struct audit_context *context = audit_context();
2316
2317 context->ipc.uid = ipcp->uid;
2318 context->ipc.gid = ipcp->gid;
2319 context->ipc.mode = ipcp->mode;
2320 context->ipc.has_perm = 0;
2321 security_ipc_getsecid(ipcp, &context->ipc.osid);
2322 context->type = AUDIT_IPC;
2323}
2324
2325/**
2326 * __audit_ipc_set_perm - record audit data for new ipc permissions
2327 * @qbytes: msgq bytes
2328 * @uid: msgq user id
2329 * @gid: msgq group id
2330 * @mode: msgq mode (permissions)
2331 *
2332 * Called only after audit_ipc_obj().
2333 */
2334void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode)
2335{
2336 struct audit_context *context = audit_context();
2337
2338 context->ipc.qbytes = qbytes;
2339 context->ipc.perm_uid = uid;
2340 context->ipc.perm_gid = gid;
2341 context->ipc.perm_mode = mode;
2342 context->ipc.has_perm = 1;
2343}
2344
2345void __audit_bprm(struct linux_binprm *bprm)
2346{
2347 struct audit_context *context = audit_context();
2348
2349 context->type = AUDIT_EXECVE;
2350 context->execve.argc = bprm->argc;
2351}
2352
2353
2354/**
2355 * __audit_socketcall - record audit data for sys_socketcall
2356 * @nargs: number of args, which should not be more than AUDITSC_ARGS.
2357 * @args: args array
2358 *
2359 */
2360int __audit_socketcall(int nargs, unsigned long *args)
2361{
2362 struct audit_context *context = audit_context();
2363
2364 if (nargs <= 0 || nargs > AUDITSC_ARGS || !args)
2365 return -EINVAL;
2366 context->type = AUDIT_SOCKETCALL;
2367 context->socketcall.nargs = nargs;
2368 memcpy(context->socketcall.args, args, nargs * sizeof(unsigned long));
2369 return 0;
2370}
2371
2372/**
2373 * __audit_fd_pair - record audit data for pipe and socketpair
2374 * @fd1: the first file descriptor
2375 * @fd2: the second file descriptor
2376 *
2377 */
2378void __audit_fd_pair(int fd1, int fd2)
2379{
2380 struct audit_context *context = audit_context();
2381
2382 context->fds[0] = fd1;
2383 context->fds[1] = fd2;
2384}
2385
2386/**
2387 * __audit_sockaddr - record audit data for sys_bind, sys_connect, sys_sendto
2388 * @len: data length in user space
2389 * @a: data address in kernel space
2390 *
2391 * Returns 0 for success or NULL context or < 0 on error.
2392 */
2393int __audit_sockaddr(int len, void *a)
2394{
2395 struct audit_context *context = audit_context();
2396
2397 if (!context->sockaddr) {
2398 void *p = kmalloc(sizeof(struct sockaddr_storage), GFP_KERNEL);
2399
2400 if (!p)
2401 return -ENOMEM;
2402 context->sockaddr = p;
2403 }
2404
2405 context->sockaddr_len = len;
2406 memcpy(context->sockaddr, a, len);
2407 return 0;
2408}
2409
2410void __audit_ptrace(struct task_struct *t)
2411{
2412 struct audit_context *context = audit_context();
2413
2414 context->target_pid = task_tgid_nr(t);
2415 context->target_auid = audit_get_loginuid(t);
2416 context->target_uid = task_uid(t);
2417 context->target_sessionid = audit_get_sessionid(t);
2418 security_task_getsecid_obj(t, &context->target_sid);
2419 memcpy(context->target_comm, t->comm, TASK_COMM_LEN);
2420}
2421
2422/**
2423 * audit_signal_info_syscall - record signal info for syscalls
2424 * @t: task being signaled
2425 *
2426 * If the audit subsystem is being terminated, record the task (pid)
2427 * and uid that is doing that.
2428 */
2429int audit_signal_info_syscall(struct task_struct *t)
2430{
2431 struct audit_aux_data_pids *axp;
2432 struct audit_context *ctx = audit_context();
2433 kuid_t t_uid = task_uid(t);
2434
2435 if (!audit_signals || audit_dummy_context())
2436 return 0;
2437
2438 /* optimize the common case by putting first signal recipient directly
2439 * in audit_context */
2440 if (!ctx->target_pid) {
2441 ctx->target_pid = task_tgid_nr(t);
2442 ctx->target_auid = audit_get_loginuid(t);
2443 ctx->target_uid = t_uid;
2444 ctx->target_sessionid = audit_get_sessionid(t);
2445 security_task_getsecid_obj(t, &ctx->target_sid);
2446 memcpy(ctx->target_comm, t->comm, TASK_COMM_LEN);
2447 return 0;
2448 }
2449
2450 axp = (void *)ctx->aux_pids;
2451 if (!axp || axp->pid_count == AUDIT_AUX_PIDS) {
2452 axp = kzalloc(sizeof(*axp), GFP_ATOMIC);
2453 if (!axp)
2454 return -ENOMEM;
2455
2456 axp->d.type = AUDIT_OBJ_PID;
2457 axp->d.next = ctx->aux_pids;
2458 ctx->aux_pids = (void *)axp;
2459 }
2460 BUG_ON(axp->pid_count >= AUDIT_AUX_PIDS);
2461
2462 axp->target_pid[axp->pid_count] = task_tgid_nr(t);
2463 axp->target_auid[axp->pid_count] = audit_get_loginuid(t);
2464 axp->target_uid[axp->pid_count] = t_uid;
2465 axp->target_sessionid[axp->pid_count] = audit_get_sessionid(t);
2466 security_task_getsecid_obj(t, &axp->target_sid[axp->pid_count]);
2467 memcpy(axp->target_comm[axp->pid_count], t->comm, TASK_COMM_LEN);
2468 axp->pid_count++;
2469
2470 return 0;
2471}
2472
2473/**
2474 * __audit_log_bprm_fcaps - store information about a loading bprm and relevant fcaps
2475 * @bprm: pointer to the bprm being processed
2476 * @new: the proposed new credentials
2477 * @old: the old credentials
2478 *
2479 * Simply check if the proc already has the caps given by the file and if not
2480 * store the priv escalation info for later auditing at the end of the syscall
2481 *
2482 * -Eric
2483 */
2484int __audit_log_bprm_fcaps(struct linux_binprm *bprm,
2485 const struct cred *new, const struct cred *old)
2486{
2487 struct audit_aux_data_bprm_fcaps *ax;
2488 struct audit_context *context = audit_context();
2489 struct cpu_vfs_cap_data vcaps;
2490
2491 ax = kmalloc(sizeof(*ax), GFP_KERNEL);
2492 if (!ax)
2493 return -ENOMEM;
2494
2495 ax->d.type = AUDIT_BPRM_FCAPS;
2496 ax->d.next = context->aux;
2497 context->aux = (void *)ax;
2498
2499 get_vfs_caps_from_disk(&init_user_ns,
2500 bprm->file->f_path.dentry, &vcaps);
2501
2502 ax->fcap.permitted = vcaps.permitted;
2503 ax->fcap.inheritable = vcaps.inheritable;
2504 ax->fcap.fE = !!(vcaps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE);
2505 ax->fcap.rootid = vcaps.rootid;
2506 ax->fcap_ver = (vcaps.magic_etc & VFS_CAP_REVISION_MASK) >> VFS_CAP_REVISION_SHIFT;
2507
2508 ax->old_pcap.permitted = old->cap_permitted;
2509 ax->old_pcap.inheritable = old->cap_inheritable;
2510 ax->old_pcap.effective = old->cap_effective;
2511 ax->old_pcap.ambient = old->cap_ambient;
2512
2513 ax->new_pcap.permitted = new->cap_permitted;
2514 ax->new_pcap.inheritable = new->cap_inheritable;
2515 ax->new_pcap.effective = new->cap_effective;
2516 ax->new_pcap.ambient = new->cap_ambient;
2517 return 0;
2518}
2519
2520/**
2521 * __audit_log_capset - store information about the arguments to the capset syscall
2522 * @new: the new credentials
2523 * @old: the old (current) credentials
2524 *
2525 * Record the arguments userspace sent to sys_capset for later printing by the
2526 * audit system if applicable
2527 */
2528void __audit_log_capset(const struct cred *new, const struct cred *old)
2529{
2530 struct audit_context *context = audit_context();
2531
2532 context->capset.pid = task_tgid_nr(current);
2533 context->capset.cap.effective = new->cap_effective;
2534 context->capset.cap.inheritable = new->cap_effective;
2535 context->capset.cap.permitted = new->cap_permitted;
2536 context->capset.cap.ambient = new->cap_ambient;
2537 context->type = AUDIT_CAPSET;
2538}
2539
2540void __audit_mmap_fd(int fd, int flags)
2541{
2542 struct audit_context *context = audit_context();
2543
2544 context->mmap.fd = fd;
2545 context->mmap.flags = flags;
2546 context->type = AUDIT_MMAP;
2547}
2548
2549void __audit_log_kern_module(char *name)
2550{
2551 struct audit_context *context = audit_context();
2552
2553 context->module.name = kstrdup(name, GFP_KERNEL);
2554 if (!context->module.name)
2555 audit_log_lost("out of memory in __audit_log_kern_module");
2556 context->type = AUDIT_KERN_MODULE;
2557}
2558
2559void __audit_fanotify(unsigned int response)
2560{
2561 audit_log(audit_context(), GFP_KERNEL,
2562 AUDIT_FANOTIFY, "resp=%u", response);
2563}
2564
2565void __audit_tk_injoffset(struct timespec64 offset)
2566{
2567 audit_log(audit_context(), GFP_KERNEL, AUDIT_TIME_INJOFFSET,
2568 "sec=%lli nsec=%li",
2569 (long long)offset.tv_sec, offset.tv_nsec);
2570}
2571
2572static void audit_log_ntp_val(const struct audit_ntp_data *ad,
2573 const char *op, enum audit_ntp_type type)
2574{
2575 const struct audit_ntp_val *val = &ad->vals[type];
2576
2577 if (val->newval == val->oldval)
2578 return;
2579
2580 audit_log(audit_context(), GFP_KERNEL, AUDIT_TIME_ADJNTPVAL,
2581 "op=%s old=%lli new=%lli", op, val->oldval, val->newval);
2582}
2583
2584void __audit_ntp_log(const struct audit_ntp_data *ad)
2585{
2586 audit_log_ntp_val(ad, "offset", AUDIT_NTP_OFFSET);
2587 audit_log_ntp_val(ad, "freq", AUDIT_NTP_FREQ);
2588 audit_log_ntp_val(ad, "status", AUDIT_NTP_STATUS);
2589 audit_log_ntp_val(ad, "tai", AUDIT_NTP_TAI);
2590 audit_log_ntp_val(ad, "tick", AUDIT_NTP_TICK);
2591 audit_log_ntp_val(ad, "adjust", AUDIT_NTP_ADJUST);
2592}
2593
2594void __audit_log_nfcfg(const char *name, u8 af, unsigned int nentries,
2595 enum audit_nfcfgop op, gfp_t gfp)
2596{
2597 struct audit_buffer *ab;
2598 char comm[sizeof(current->comm)];
2599
2600 ab = audit_log_start(audit_context(), gfp, AUDIT_NETFILTER_CFG);
2601 if (!ab)
2602 return;
2603 audit_log_format(ab, "table=%s family=%u entries=%u op=%s",
2604 name, af, nentries, audit_nfcfgs[op].s);
2605
2606 audit_log_format(ab, " pid=%u", task_pid_nr(current));
2607 audit_log_task_context(ab); /* subj= */
2608 audit_log_format(ab, " comm=");
2609 audit_log_untrustedstring(ab, get_task_comm(comm, current));
2610 audit_log_end(ab);
2611}
2612EXPORT_SYMBOL_GPL(__audit_log_nfcfg);
2613
2614static void audit_log_task(struct audit_buffer *ab)
2615{
2616 kuid_t auid, uid;
2617 kgid_t gid;
2618 unsigned int sessionid;
2619 char comm[sizeof(current->comm)];
2620
2621 auid = audit_get_loginuid(current);
2622 sessionid = audit_get_sessionid(current);
2623 current_uid_gid(&uid, &gid);
2624
2625 audit_log_format(ab, "auid=%u uid=%u gid=%u ses=%u",
2626 from_kuid(&init_user_ns, auid),
2627 from_kuid(&init_user_ns, uid),
2628 from_kgid(&init_user_ns, gid),
2629 sessionid);
2630 audit_log_task_context(ab);
2631 audit_log_format(ab, " pid=%d comm=", task_tgid_nr(current));
2632 audit_log_untrustedstring(ab, get_task_comm(comm, current));
2633 audit_log_d_path_exe(ab, current->mm);
2634}
2635
2636/**
2637 * audit_core_dumps - record information about processes that end abnormally
2638 * @signr: signal value
2639 *
2640 * If a process ends with a core dump, something fishy is going on and we
2641 * should record the event for investigation.
2642 */
2643void audit_core_dumps(long signr)
2644{
2645 struct audit_buffer *ab;
2646
2647 if (!audit_enabled)
2648 return;
2649
2650 if (signr == SIGQUIT) /* don't care for those */
2651 return;
2652
2653 ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_ANOM_ABEND);
2654 if (unlikely(!ab))
2655 return;
2656 audit_log_task(ab);
2657 audit_log_format(ab, " sig=%ld res=1", signr);
2658 audit_log_end(ab);
2659}
2660
2661/**
2662 * audit_seccomp - record information about a seccomp action
2663 * @syscall: syscall number
2664 * @signr: signal value
2665 * @code: the seccomp action
2666 *
2667 * Record the information associated with a seccomp action. Event filtering for
2668 * seccomp actions that are not to be logged is done in seccomp_log().
2669 * Therefore, this function forces auditing independent of the audit_enabled
2670 * and dummy context state because seccomp actions should be logged even when
2671 * audit is not in use.
2672 */
2673void audit_seccomp(unsigned long syscall, long signr, int code)
2674{
2675 struct audit_buffer *ab;
2676
2677 ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_SECCOMP);
2678 if (unlikely(!ab))
2679 return;
2680 audit_log_task(ab);
2681 audit_log_format(ab, " sig=%ld arch=%x syscall=%ld compat=%d ip=0x%lx code=0x%x",
2682 signr, syscall_get_arch(current), syscall,
2683 in_compat_syscall(), KSTK_EIP(current), code);
2684 audit_log_end(ab);
2685}
2686
2687void audit_seccomp_actions_logged(const char *names, const char *old_names,
2688 int res)
2689{
2690 struct audit_buffer *ab;
2691
2692 if (!audit_enabled)
2693 return;
2694
2695 ab = audit_log_start(audit_context(), GFP_KERNEL,
2696 AUDIT_CONFIG_CHANGE);
2697 if (unlikely(!ab))
2698 return;
2699
2700 audit_log_format(ab,
2701 "op=seccomp-logging actions=%s old-actions=%s res=%d",
2702 names, old_names, res);
2703 audit_log_end(ab);
2704}
2705
2706struct list_head *audit_killed_trees(void)
2707{
2708 struct audit_context *ctx = audit_context();
2709
2710 if (likely(!ctx || !ctx->in_syscall))
2711 return NULL;
2712 return &ctx->killed_trees;
2713}