1 /* auditsc.c -- System-call auditing support
2 * Handles all system-call specific auditing features.
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
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.
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.
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
23 * Written by Rickard E. (Rik) Faith <faith@redhat.com>
25 * Many of the ideas implemented here are from Stephen C. Tweedie,
26 * especially the idea of avoiding a copy by using getname.
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.
32 * POSIX message queue support added by George Wilson <ltcgcw@us.ibm.com>,
35 * The support of additional filter rules compares (>, <, >=, <=) was
36 * added by Dustin Kirkland <dustin.kirkland@us.ibm.com>, 2005.
38 * Modified by Amy Griffis <amy.griffis@hp.com> to collect additional
39 * filesystem information.
41 * Subject and object context labeling support added by <danjones@us.ibm.com>
42 * and <dustin.kirkland@us.ibm.com> for LSPP certification compliance.
45 #include <linux/init.h>
46 #include <asm/types.h>
47 #include <asm/atomic.h>
48 #include <asm/types.h>
50 #include <linux/namei.h>
52 #include <linux/module.h>
53 #include <linux/mount.h>
54 #include <linux/socket.h>
55 #include <linux/mqueue.h>
56 #include <linux/audit.h>
57 #include <linux/personality.h>
58 #include <linux/time.h>
59 #include <linux/netlink.h>
60 #include <linux/compiler.h>
61 #include <asm/unistd.h>
62 #include <linux/security.h>
63 #include <linux/list.h>
64 #include <linux/tty.h>
65 #include <linux/selinux.h>
66 #include <linux/binfmts.h>
67 #include <linux/syscalls.h>
71 extern struct list_head audit_filter_list[];
73 /* No syscall auditing will take place unless audit_enabled != 0. */
74 extern int audit_enabled;
76 /* AUDIT_NAMES is the number of slots we reserve in the audit_context
77 * for saving names from getname(). */
78 #define AUDIT_NAMES 20
80 /* AUDIT_NAMES_RESERVED is the number of slots we reserve in the
81 * audit_context from being used for nameless inodes from
83 #define AUDIT_NAMES_RESERVED 7
85 /* Indicates that audit should log the full pathname. */
86 #define AUDIT_NAME_FULL -1
88 /* When fs/namei.c:getname() is called, we store the pointer in name and
89 * we don't let putname() free it (instead we free all of the saved
90 * pointers at syscall exit time).
92 * Further, in fs/namei.c:path_lookup() we store the inode and device. */
95 int name_len; /* number of name's characters to log */
96 unsigned name_put; /* call __putname() for this name */
106 struct audit_aux_data {
107 struct audit_aux_data *next;
111 #define AUDIT_AUX_IPCPERM 0
113 struct audit_aux_data_mq_open {
114 struct audit_aux_data d;
120 struct audit_aux_data_mq_sendrecv {
121 struct audit_aux_data d;
124 unsigned int msg_prio;
125 struct timespec abs_timeout;
128 struct audit_aux_data_mq_notify {
129 struct audit_aux_data d;
131 struct sigevent notification;
134 struct audit_aux_data_mq_getsetattr {
135 struct audit_aux_data d;
137 struct mq_attr mqstat;
140 struct audit_aux_data_ipcctl {
141 struct audit_aux_data d;
143 unsigned long qbytes;
150 struct audit_aux_data_execve {
151 struct audit_aux_data d;
157 struct audit_aux_data_socketcall {
158 struct audit_aux_data d;
160 unsigned long args[0];
163 struct audit_aux_data_sockaddr {
164 struct audit_aux_data d;
169 struct audit_aux_data_path {
170 struct audit_aux_data d;
171 struct dentry *dentry;
172 struct vfsmount *mnt;
175 /* The per-task audit context. */
176 struct audit_context {
177 int in_syscall; /* 1 if task is in a syscall */
178 enum audit_state state;
179 unsigned int serial; /* serial number for record */
180 struct timespec ctime; /* time of syscall entry */
181 uid_t loginuid; /* login uid (identity) */
182 int major; /* syscall number */
183 unsigned long argv[4]; /* syscall arguments */
184 int return_valid; /* return code is valid */
185 long return_code;/* syscall return code */
186 int auditable; /* 1 if record should be written */
188 struct audit_names names[AUDIT_NAMES];
190 struct vfsmount * pwdmnt;
191 struct audit_context *previous; /* For nested syscalls */
192 struct audit_aux_data *aux;
194 /* Save things to print about task_struct */
196 uid_t uid, euid, suid, fsuid;
197 gid_t gid, egid, sgid, fsgid;
198 unsigned long personality;
207 /* Determine if any context name data matches a rule's watch data */
208 /* Compare a task_struct with an audit_rule. Return 1 on match, 0
210 static int audit_filter_rules(struct task_struct *tsk,
211 struct audit_krule *rule,
212 struct audit_context *ctx,
213 struct audit_names *name,
214 enum audit_state *state)
216 int i, j, need_sid = 1;
219 for (i = 0; i < rule->field_count; i++) {
220 struct audit_field *f = &rule->fields[i];
225 result = audit_comparator(tsk->pid, f->op, f->val);
229 result = audit_comparator(ctx->ppid, f->op, f->val);
232 result = audit_comparator(tsk->uid, f->op, f->val);
235 result = audit_comparator(tsk->euid, f->op, f->val);
238 result = audit_comparator(tsk->suid, f->op, f->val);
241 result = audit_comparator(tsk->fsuid, f->op, f->val);
244 result = audit_comparator(tsk->gid, f->op, f->val);
247 result = audit_comparator(tsk->egid, f->op, f->val);
250 result = audit_comparator(tsk->sgid, f->op, f->val);
253 result = audit_comparator(tsk->fsgid, f->op, f->val);
256 result = audit_comparator(tsk->personality, f->op, f->val);
260 result = audit_comparator(ctx->arch, f->op, f->val);
264 if (ctx && ctx->return_valid)
265 result = audit_comparator(ctx->return_code, f->op, f->val);
268 if (ctx && ctx->return_valid) {
270 result = audit_comparator(ctx->return_valid, f->op, AUDITSC_SUCCESS);
272 result = audit_comparator(ctx->return_valid, f->op, AUDITSC_FAILURE);
277 result = audit_comparator(MAJOR(name->dev),
280 for (j = 0; j < ctx->name_count; j++) {
281 if (audit_comparator(MAJOR(ctx->names[j].dev), f->op, f->val)) {
290 result = audit_comparator(MINOR(name->dev),
293 for (j = 0; j < ctx->name_count; j++) {
294 if (audit_comparator(MINOR(ctx->names[j].dev), f->op, f->val)) {
303 result = (name->ino == f->val);
305 for (j = 0; j < ctx->name_count; j++) {
306 if (audit_comparator(ctx->names[j].ino, f->op, f->val)) {
314 if (name && rule->watch->ino != (unsigned long)-1)
315 result = (name->dev == rule->watch->dev &&
316 name->ino == rule->watch->ino);
321 result = audit_comparator(ctx->loginuid, f->op, f->val);
328 /* NOTE: this may return negative values indicating
329 a temporary error. We simply treat this as a
330 match for now to avoid losing information that
331 may be wanted. An error message will also be
335 selinux_task_ctxid(tsk, &sid);
338 result = selinux_audit_rule_match(sid, f->type,
349 result = audit_comparator(ctx->argv[f->type-AUDIT_ARG0], f->op, f->val);
356 switch (rule->action) {
357 case AUDIT_NEVER: *state = AUDIT_DISABLED; break;
358 case AUDIT_ALWAYS: *state = AUDIT_RECORD_CONTEXT; break;
363 /* At process creation time, we can determine if system-call auditing is
364 * completely disabled for this task. Since we only have the task
365 * structure at this point, we can only check uid and gid.
367 static enum audit_state audit_filter_task(struct task_struct *tsk)
369 struct audit_entry *e;
370 enum audit_state state;
373 list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_TASK], list) {
374 if (audit_filter_rules(tsk, &e->rule, NULL, NULL, &state)) {
380 return AUDIT_BUILD_CONTEXT;
383 /* At syscall entry and exit time, this filter is called if the
384 * audit_state is not low enough that auditing cannot take place, but is
385 * also not high enough that we already know we have to write an audit
386 * record (i.e., the state is AUDIT_SETUP_CONTEXT or AUDIT_BUILD_CONTEXT).
388 static enum audit_state audit_filter_syscall(struct task_struct *tsk,
389 struct audit_context *ctx,
390 struct list_head *list)
392 struct audit_entry *e;
393 enum audit_state state;
395 if (audit_pid && tsk->tgid == audit_pid)
396 return AUDIT_DISABLED;
399 if (!list_empty(list)) {
400 int word = AUDIT_WORD(ctx->major);
401 int bit = AUDIT_BIT(ctx->major);
403 list_for_each_entry_rcu(e, list, list) {
404 if ((e->rule.mask[word] & bit) == bit &&
405 audit_filter_rules(tsk, &e->rule, ctx, NULL,
413 return AUDIT_BUILD_CONTEXT;
416 /* At syscall exit time, this filter is called if any audit_names[] have been
417 * collected during syscall processing. We only check rules in sublists at hash
418 * buckets applicable to the inode numbers in audit_names[].
419 * Regarding audit_state, same rules apply as for audit_filter_syscall().
421 enum audit_state audit_filter_inodes(struct task_struct *tsk,
422 struct audit_context *ctx)
425 struct audit_entry *e;
426 enum audit_state state;
428 if (audit_pid && tsk->tgid == audit_pid)
429 return AUDIT_DISABLED;
432 for (i = 0; i < ctx->name_count; i++) {
433 int word = AUDIT_WORD(ctx->major);
434 int bit = AUDIT_BIT(ctx->major);
435 struct audit_names *n = &ctx->names[i];
436 int h = audit_hash_ino((u32)n->ino);
437 struct list_head *list = &audit_inode_hash[h];
439 if (list_empty(list))
442 list_for_each_entry_rcu(e, list, list) {
443 if ((e->rule.mask[word] & bit) == bit &&
444 audit_filter_rules(tsk, &e->rule, ctx, n, &state)) {
451 return AUDIT_BUILD_CONTEXT;
454 void audit_set_auditable(struct audit_context *ctx)
459 static inline struct audit_context *audit_get_context(struct task_struct *tsk,
463 struct audit_context *context = tsk->audit_context;
465 if (likely(!context))
467 context->return_valid = return_valid;
468 context->return_code = return_code;
470 if (context->in_syscall && !context->auditable) {
471 enum audit_state state;
473 state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_EXIT]);
474 if (state == AUDIT_RECORD_CONTEXT) {
475 context->auditable = 1;
479 state = audit_filter_inodes(tsk, context);
480 if (state == AUDIT_RECORD_CONTEXT)
481 context->auditable = 1;
486 context->pid = tsk->pid;
487 context->ppid = sys_getppid(); /* sic. tsk == current in all cases */
488 context->uid = tsk->uid;
489 context->gid = tsk->gid;
490 context->euid = tsk->euid;
491 context->suid = tsk->suid;
492 context->fsuid = tsk->fsuid;
493 context->egid = tsk->egid;
494 context->sgid = tsk->sgid;
495 context->fsgid = tsk->fsgid;
496 context->personality = tsk->personality;
497 tsk->audit_context = NULL;
501 static inline void audit_free_names(struct audit_context *context)
506 if (context->auditable
507 ||context->put_count + context->ino_count != context->name_count) {
508 printk(KERN_ERR "%s:%d(:%d): major=%d in_syscall=%d"
509 " name_count=%d put_count=%d"
510 " ino_count=%d [NOT freeing]\n",
512 context->serial, context->major, context->in_syscall,
513 context->name_count, context->put_count,
515 for (i = 0; i < context->name_count; i++) {
516 printk(KERN_ERR "names[%d] = %p = %s\n", i,
517 context->names[i].name,
518 context->names[i].name ?: "(null)");
525 context->put_count = 0;
526 context->ino_count = 0;
529 for (i = 0; i < context->name_count; i++) {
530 if (context->names[i].name && context->names[i].name_put)
531 __putname(context->names[i].name);
533 context->name_count = 0;
537 mntput(context->pwdmnt);
539 context->pwdmnt = NULL;
542 static inline void audit_free_aux(struct audit_context *context)
544 struct audit_aux_data *aux;
546 while ((aux = context->aux)) {
547 if (aux->type == AUDIT_AVC_PATH) {
548 struct audit_aux_data_path *axi = (void *)aux;
553 context->aux = aux->next;
558 static inline void audit_zero_context(struct audit_context *context,
559 enum audit_state state)
561 uid_t loginuid = context->loginuid;
563 memset(context, 0, sizeof(*context));
564 context->state = state;
565 context->loginuid = loginuid;
568 static inline struct audit_context *audit_alloc_context(enum audit_state state)
570 struct audit_context *context;
572 if (!(context = kmalloc(sizeof(*context), GFP_KERNEL)))
574 audit_zero_context(context, state);
579 * audit_alloc - allocate an audit context block for a task
582 * Filter on the task information and allocate a per-task audit context
583 * if necessary. Doing so turns on system call auditing for the
584 * specified task. This is called from copy_process, so no lock is
587 int audit_alloc(struct task_struct *tsk)
589 struct audit_context *context;
590 enum audit_state state;
592 if (likely(!audit_enabled))
593 return 0; /* Return if not auditing. */
595 state = audit_filter_task(tsk);
596 if (likely(state == AUDIT_DISABLED))
599 if (!(context = audit_alloc_context(state))) {
600 audit_log_lost("out of memory in audit_alloc");
604 /* Preserve login uid */
605 context->loginuid = -1;
606 if (current->audit_context)
607 context->loginuid = current->audit_context->loginuid;
609 tsk->audit_context = context;
610 set_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT);
614 static inline void audit_free_context(struct audit_context *context)
616 struct audit_context *previous;
620 previous = context->previous;
621 if (previous || (count && count < 10)) {
623 printk(KERN_ERR "audit(:%d): major=%d name_count=%d:"
624 " freeing multiple contexts (%d)\n",
625 context->serial, context->major,
626 context->name_count, count);
628 audit_free_names(context);
629 audit_free_aux(context);
634 printk(KERN_ERR "audit: freed %d contexts\n", count);
637 static void audit_log_task_context(struct audit_buffer *ab)
642 len = security_getprocattr(current, "current", NULL, 0);
649 ctx = kmalloc(len, GFP_KERNEL);
653 len = security_getprocattr(current, "current", ctx, len);
657 audit_log_format(ab, " subj=%s", ctx);
663 audit_panic("error in audit_log_task_context");
667 static void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk)
669 char name[sizeof(tsk->comm)];
670 struct mm_struct *mm = tsk->mm;
671 struct vm_area_struct *vma;
675 get_task_comm(name, tsk);
676 audit_log_format(ab, " comm=");
677 audit_log_untrustedstring(ab, name);
680 down_read(&mm->mmap_sem);
683 if ((vma->vm_flags & VM_EXECUTABLE) &&
685 audit_log_d_path(ab, "exe=",
686 vma->vm_file->f_dentry,
687 vma->vm_file->f_vfsmnt);
692 up_read(&mm->mmap_sem);
694 audit_log_task_context(ab);
697 static void audit_log_exit(struct audit_context *context, struct task_struct *tsk)
699 int i, call_panic = 0;
700 struct audit_buffer *ab;
701 struct audit_aux_data *aux;
706 ab = audit_log_start(context, GFP_KERNEL, AUDIT_SYSCALL);
708 return; /* audit_panic has been called */
709 audit_log_format(ab, "arch=%x syscall=%d",
710 context->arch, context->major);
711 if (context->personality != PER_LINUX)
712 audit_log_format(ab, " per=%lx", context->personality);
713 if (context->return_valid)
714 audit_log_format(ab, " success=%s exit=%ld",
715 (context->return_valid==AUDITSC_SUCCESS)?"yes":"no",
716 context->return_code);
717 if (tsk->signal && tsk->signal->tty && tsk->signal->tty->name)
718 tty = tsk->signal->tty->name;
722 " a0=%lx a1=%lx a2=%lx a3=%lx items=%d"
723 " ppid=%d pid=%d auid=%u uid=%u gid=%u"
724 " euid=%u suid=%u fsuid=%u"
725 " egid=%u sgid=%u fsgid=%u tty=%s",
736 context->euid, context->suid, context->fsuid,
737 context->egid, context->sgid, context->fsgid, tty);
738 audit_log_task_info(ab, tsk);
741 for (aux = context->aux; aux; aux = aux->next) {
743 ab = audit_log_start(context, GFP_KERNEL, aux->type);
745 continue; /* audit_panic has been called */
748 case AUDIT_MQ_OPEN: {
749 struct audit_aux_data_mq_open *axi = (void *)aux;
751 "oflag=0x%x mode=%#o mq_flags=0x%lx mq_maxmsg=%ld "
752 "mq_msgsize=%ld mq_curmsgs=%ld",
753 axi->oflag, axi->mode, axi->attr.mq_flags,
754 axi->attr.mq_maxmsg, axi->attr.mq_msgsize,
755 axi->attr.mq_curmsgs);
758 case AUDIT_MQ_SENDRECV: {
759 struct audit_aux_data_mq_sendrecv *axi = (void *)aux;
761 "mqdes=%d msg_len=%zd msg_prio=%u "
762 "abs_timeout_sec=%ld abs_timeout_nsec=%ld",
763 axi->mqdes, axi->msg_len, axi->msg_prio,
764 axi->abs_timeout.tv_sec, axi->abs_timeout.tv_nsec);
767 case AUDIT_MQ_NOTIFY: {
768 struct audit_aux_data_mq_notify *axi = (void *)aux;
770 "mqdes=%d sigev_signo=%d",
772 axi->notification.sigev_signo);
775 case AUDIT_MQ_GETSETATTR: {
776 struct audit_aux_data_mq_getsetattr *axi = (void *)aux;
778 "mqdes=%d mq_flags=0x%lx mq_maxmsg=%ld mq_msgsize=%ld "
781 axi->mqstat.mq_flags, axi->mqstat.mq_maxmsg,
782 axi->mqstat.mq_msgsize, axi->mqstat.mq_curmsgs);
786 struct audit_aux_data_ipcctl *axi = (void *)aux;
788 "ouid=%u ogid=%u mode=%x",
789 axi->uid, axi->gid, axi->mode);
790 if (axi->osid != 0) {
793 if (selinux_ctxid_to_string(
794 axi->osid, &ctx, &len)) {
795 audit_log_format(ab, " osid=%u",
799 audit_log_format(ab, " obj=%s", ctx);
804 case AUDIT_IPC_SET_PERM: {
805 struct audit_aux_data_ipcctl *axi = (void *)aux;
807 "qbytes=%lx ouid=%u ogid=%u mode=%x",
808 axi->qbytes, axi->uid, axi->gid, axi->mode);
812 struct audit_aux_data_execve *axi = (void *)aux;
815 for (i = 0, p = axi->mem; i < axi->argc; i++) {
816 audit_log_format(ab, "a%d=", i);
817 p = audit_log_untrustedstring(ab, p);
818 audit_log_format(ab, "\n");
822 case AUDIT_SOCKETCALL: {
824 struct audit_aux_data_socketcall *axs = (void *)aux;
825 audit_log_format(ab, "nargs=%d", axs->nargs);
826 for (i=0; i<axs->nargs; i++)
827 audit_log_format(ab, " a%d=%lx", i, axs->args[i]);
830 case AUDIT_SOCKADDR: {
831 struct audit_aux_data_sockaddr *axs = (void *)aux;
833 audit_log_format(ab, "saddr=");
834 audit_log_hex(ab, axs->a, axs->len);
837 case AUDIT_AVC_PATH: {
838 struct audit_aux_data_path *axi = (void *)aux;
839 audit_log_d_path(ab, "path=", axi->dentry, axi->mnt);
846 if (context->pwd && context->pwdmnt) {
847 ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD);
849 audit_log_d_path(ab, "cwd=", context->pwd, context->pwdmnt);
853 for (i = 0; i < context->name_count; i++) {
854 struct audit_names *n = &context->names[i];
856 ab = audit_log_start(context, GFP_KERNEL, AUDIT_PATH);
858 continue; /* audit_panic has been called */
860 audit_log_format(ab, "item=%d", i);
863 switch(n->name_len) {
864 case AUDIT_NAME_FULL:
865 /* log the full path */
866 audit_log_format(ab, " name=");
867 audit_log_untrustedstring(ab, n->name);
870 /* name was specified as a relative path and the
871 * directory component is the cwd */
872 audit_log_d_path(ab, " name=", context->pwd,
876 /* log the name's directory component */
877 audit_log_format(ab, " name=");
878 audit_log_n_untrustedstring(ab, n->name_len,
882 audit_log_format(ab, " name=(null)");
884 if (n->ino != (unsigned long)-1) {
885 audit_log_format(ab, " inode=%lu"
886 " dev=%02x:%02x mode=%#o"
887 " ouid=%u ogid=%u rdev=%02x:%02x",
900 if (selinux_ctxid_to_string(
901 n->osid, &ctx, &len)) {
902 audit_log_format(ab, " osid=%u", n->osid);
905 audit_log_format(ab, " obj=%s", ctx);
912 audit_panic("error converting sid to string");
916 * audit_free - free a per-task audit context
917 * @tsk: task whose audit context block to free
919 * Called from copy_process and do_exit
921 void audit_free(struct task_struct *tsk)
923 struct audit_context *context;
925 context = audit_get_context(tsk, 0, 0);
926 if (likely(!context))
929 /* Check for system calls that do not go through the exit
930 * function (e.g., exit_group), then free context block.
931 * We use GFP_ATOMIC here because we might be doing this
932 * in the context of the idle thread */
933 /* that can happen only if we are called from do_exit() */
934 if (context->in_syscall && context->auditable)
935 audit_log_exit(context, tsk);
937 audit_free_context(context);
941 * audit_syscall_entry - fill in an audit record at syscall entry
942 * @tsk: task being audited
943 * @arch: architecture type
944 * @major: major syscall type (function)
945 * @a1: additional syscall register 1
946 * @a2: additional syscall register 2
947 * @a3: additional syscall register 3
948 * @a4: additional syscall register 4
950 * Fill in audit context at syscall entry. This only happens if the
951 * audit context was created when the task was created and the state or
952 * filters demand the audit context be built. If the state from the
953 * per-task filter or from the per-syscall filter is AUDIT_RECORD_CONTEXT,
954 * then the record will be written at syscall exit time (otherwise, it
955 * will only be written if another part of the kernel requests that it
958 void audit_syscall_entry(int arch, int major,
959 unsigned long a1, unsigned long a2,
960 unsigned long a3, unsigned long a4)
962 struct task_struct *tsk = current;
963 struct audit_context *context = tsk->audit_context;
964 enum audit_state state;
969 * This happens only on certain architectures that make system
970 * calls in kernel_thread via the entry.S interface, instead of
971 * with direct calls. (If you are porting to a new
972 * architecture, hitting this condition can indicate that you
973 * got the _exit/_leave calls backward in entry.S.)
977 * ppc64 yes (see arch/powerpc/platforms/iseries/misc.S)
979 * This also happens with vm86 emulation in a non-nested manner
980 * (entries without exits), so this case must be caught.
982 if (context->in_syscall) {
983 struct audit_context *newctx;
987 "audit(:%d) pid=%d in syscall=%d;"
988 " entering syscall=%d\n",
989 context->serial, tsk->pid, context->major, major);
991 newctx = audit_alloc_context(context->state);
993 newctx->previous = context;
995 tsk->audit_context = newctx;
997 /* If we can't alloc a new context, the best we
998 * can do is to leak memory (any pending putname
999 * will be lost). The only other alternative is
1000 * to abandon auditing. */
1001 audit_zero_context(context, context->state);
1004 BUG_ON(context->in_syscall || context->name_count);
1009 context->arch = arch;
1010 context->major = major;
1011 context->argv[0] = a1;
1012 context->argv[1] = a2;
1013 context->argv[2] = a3;
1014 context->argv[3] = a4;
1016 state = context->state;
1017 if (state == AUDIT_SETUP_CONTEXT || state == AUDIT_BUILD_CONTEXT)
1018 state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_ENTRY]);
1019 if (likely(state == AUDIT_DISABLED))
1022 context->serial = 0;
1023 context->ctime = CURRENT_TIME;
1024 context->in_syscall = 1;
1025 context->auditable = !!(state == AUDIT_RECORD_CONTEXT);
1029 * audit_syscall_exit - deallocate audit context after a system call
1030 * @tsk: task being audited
1031 * @valid: success/failure flag
1032 * @return_code: syscall return value
1034 * Tear down after system call. If the audit context has been marked as
1035 * auditable (either because of the AUDIT_RECORD_CONTEXT state from
1036 * filtering, or because some other part of the kernel write an audit
1037 * message), then write out the syscall information. In call cases,
1038 * free the names stored from getname().
1040 void audit_syscall_exit(int valid, long return_code)
1042 struct task_struct *tsk = current;
1043 struct audit_context *context;
1045 context = audit_get_context(tsk, valid, return_code);
1047 if (likely(!context))
1050 if (context->in_syscall && context->auditable)
1051 audit_log_exit(context, tsk);
1053 context->in_syscall = 0;
1054 context->auditable = 0;
1056 if (context->previous) {
1057 struct audit_context *new_context = context->previous;
1058 context->previous = NULL;
1059 audit_free_context(context);
1060 tsk->audit_context = new_context;
1062 audit_free_names(context);
1063 audit_free_aux(context);
1064 tsk->audit_context = context;
1069 * audit_getname - add a name to the list
1070 * @name: name to add
1072 * Add a name to the list of audit names for this context.
1073 * Called from fs/namei.c:getname().
1075 void __audit_getname(const char *name)
1077 struct audit_context *context = current->audit_context;
1079 if (IS_ERR(name) || !name)
1082 if (!context->in_syscall) {
1083 #if AUDIT_DEBUG == 2
1084 printk(KERN_ERR "%s:%d(:%d): ignoring getname(%p)\n",
1085 __FILE__, __LINE__, context->serial, name);
1090 BUG_ON(context->name_count >= AUDIT_NAMES);
1091 context->names[context->name_count].name = name;
1092 context->names[context->name_count].name_len = AUDIT_NAME_FULL;
1093 context->names[context->name_count].name_put = 1;
1094 context->names[context->name_count].ino = (unsigned long)-1;
1095 ++context->name_count;
1096 if (!context->pwd) {
1097 read_lock(¤t->fs->lock);
1098 context->pwd = dget(current->fs->pwd);
1099 context->pwdmnt = mntget(current->fs->pwdmnt);
1100 read_unlock(¤t->fs->lock);
1105 /* audit_putname - intercept a putname request
1106 * @name: name to intercept and delay for putname
1108 * If we have stored the name from getname in the audit context,
1109 * then we delay the putname until syscall exit.
1110 * Called from include/linux/fs.h:putname().
1112 void audit_putname(const char *name)
1114 struct audit_context *context = current->audit_context;
1117 if (!context->in_syscall) {
1118 #if AUDIT_DEBUG == 2
1119 printk(KERN_ERR "%s:%d(:%d): __putname(%p)\n",
1120 __FILE__, __LINE__, context->serial, name);
1121 if (context->name_count) {
1123 for (i = 0; i < context->name_count; i++)
1124 printk(KERN_ERR "name[%d] = %p = %s\n", i,
1125 context->names[i].name,
1126 context->names[i].name ?: "(null)");
1133 ++context->put_count;
1134 if (context->put_count > context->name_count) {
1135 printk(KERN_ERR "%s:%d(:%d): major=%d"
1136 " in_syscall=%d putname(%p) name_count=%d"
1139 context->serial, context->major,
1140 context->in_syscall, name, context->name_count,
1141 context->put_count);
1148 static void audit_inode_context(int idx, const struct inode *inode)
1150 struct audit_context *context = current->audit_context;
1152 selinux_get_inode_sid(inode, &context->names[idx].osid);
1157 * audit_inode - store the inode and device from a lookup
1158 * @name: name being audited
1159 * @inode: inode being audited
1161 * Called from fs/namei.c:path_lookup().
1163 void __audit_inode(const char *name, const struct inode *inode)
1166 struct audit_context *context = current->audit_context;
1168 if (!context->in_syscall)
1170 if (context->name_count
1171 && context->names[context->name_count-1].name
1172 && context->names[context->name_count-1].name == name)
1173 idx = context->name_count - 1;
1174 else if (context->name_count > 1
1175 && context->names[context->name_count-2].name
1176 && context->names[context->name_count-2].name == name)
1177 idx = context->name_count - 2;
1179 /* FIXME: how much do we care about inodes that have no
1180 * associated name? */
1181 if (context->name_count >= AUDIT_NAMES - AUDIT_NAMES_RESERVED)
1183 idx = context->name_count++;
1184 context->names[idx].name = NULL;
1186 ++context->ino_count;
1189 context->names[idx].ino = inode->i_ino;
1190 context->names[idx].dev = inode->i_sb->s_dev;
1191 context->names[idx].mode = inode->i_mode;
1192 context->names[idx].uid = inode->i_uid;
1193 context->names[idx].gid = inode->i_gid;
1194 context->names[idx].rdev = inode->i_rdev;
1195 audit_inode_context(idx, inode);
1199 * audit_inode_child - collect inode info for created/removed objects
1200 * @dname: inode's dentry name
1201 * @inode: inode being audited
1202 * @pino: inode number of dentry parent
1204 * For syscalls that create or remove filesystem objects, audit_inode
1205 * can only collect information for the filesystem object's parent.
1206 * This call updates the audit context with the child's information.
1207 * Syscalls that create a new filesystem object must be hooked after
1208 * the object is created. Syscalls that remove a filesystem object
1209 * must be hooked prior, in order to capture the target inode during
1210 * unsuccessful attempts.
1212 void __audit_inode_child(const char *dname, const struct inode *inode,
1216 struct audit_context *context = current->audit_context;
1217 const char *found_name = NULL;
1220 if (!context->in_syscall)
1223 /* determine matching parent */
1225 goto update_context;
1226 for (idx = 0; idx < context->name_count; idx++)
1227 if (context->names[idx].ino == pino) {
1228 const char *name = context->names[idx].name;
1233 if (audit_compare_dname_path(dname, name, &dirlen) == 0) {
1234 context->names[idx].name_len = dirlen;
1241 idx = context->name_count++;
1243 context->ino_count++;
1245 /* Re-use the name belonging to the slot for a matching parent directory.
1246 * All names for this context are relinquished in audit_free_names() */
1247 context->names[idx].name = found_name;
1248 context->names[idx].name_len = AUDIT_NAME_FULL;
1249 context->names[idx].name_put = 0; /* don't call __putname() */
1252 context->names[idx].ino = inode->i_ino;
1253 context->names[idx].dev = inode->i_sb->s_dev;
1254 context->names[idx].mode = inode->i_mode;
1255 context->names[idx].uid = inode->i_uid;
1256 context->names[idx].gid = inode->i_gid;
1257 context->names[idx].rdev = inode->i_rdev;
1258 audit_inode_context(idx, inode);
1260 context->names[idx].ino = (unsigned long)-1;
1264 * auditsc_get_stamp - get local copies of audit_context values
1265 * @ctx: audit_context for the task
1266 * @t: timespec to store time recorded in the audit_context
1267 * @serial: serial value that is recorded in the audit_context
1269 * Also sets the context as auditable.
1271 void auditsc_get_stamp(struct audit_context *ctx,
1272 struct timespec *t, unsigned int *serial)
1275 ctx->serial = audit_serial();
1276 t->tv_sec = ctx->ctime.tv_sec;
1277 t->tv_nsec = ctx->ctime.tv_nsec;
1278 *serial = ctx->serial;
1283 * audit_set_loginuid - set a task's audit_context loginuid
1284 * @task: task whose audit context is being modified
1285 * @loginuid: loginuid value
1289 * Called (set) from fs/proc/base.c::proc_loginuid_write().
1291 int audit_set_loginuid(struct task_struct *task, uid_t loginuid)
1293 struct audit_context *context = task->audit_context;
1296 /* Only log if audit is enabled */
1297 if (context->in_syscall) {
1298 struct audit_buffer *ab;
1300 ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_LOGIN);
1302 audit_log_format(ab, "login pid=%d uid=%u "
1303 "old auid=%u new auid=%u",
1304 task->pid, task->uid,
1305 context->loginuid, loginuid);
1309 context->loginuid = loginuid;
1315 * audit_get_loginuid - get the loginuid for an audit_context
1316 * @ctx: the audit_context
1318 * Returns the context's loginuid or -1 if @ctx is NULL.
1320 uid_t audit_get_loginuid(struct audit_context *ctx)
1322 return ctx ? ctx->loginuid : -1;
1326 * __audit_mq_open - record audit data for a POSIX MQ open
1329 * @u_attr: queue attributes
1331 * Returns 0 for success or NULL context or < 0 on error.
1333 int __audit_mq_open(int oflag, mode_t mode, struct mq_attr __user *u_attr)
1335 struct audit_aux_data_mq_open *ax;
1336 struct audit_context *context = current->audit_context;
1341 if (likely(!context))
1344 ax = kmalloc(sizeof(*ax), GFP_ATOMIC);
1348 if (u_attr != NULL) {
1349 if (copy_from_user(&ax->attr, u_attr, sizeof(ax->attr))) {
1354 memset(&ax->attr, 0, sizeof(ax->attr));
1359 ax->d.type = AUDIT_MQ_OPEN;
1360 ax->d.next = context->aux;
1361 context->aux = (void *)ax;
1366 * __audit_mq_timedsend - record audit data for a POSIX MQ timed send
1367 * @mqdes: MQ descriptor
1368 * @msg_len: Message length
1369 * @msg_prio: Message priority
1370 * @abs_timeout: Message timeout in absolute time
1372 * Returns 0 for success or NULL context or < 0 on error.
1374 int __audit_mq_timedsend(mqd_t mqdes, size_t msg_len, unsigned int msg_prio,
1375 const struct timespec __user *u_abs_timeout)
1377 struct audit_aux_data_mq_sendrecv *ax;
1378 struct audit_context *context = current->audit_context;
1383 if (likely(!context))
1386 ax = kmalloc(sizeof(*ax), GFP_ATOMIC);
1390 if (u_abs_timeout != NULL) {
1391 if (copy_from_user(&ax->abs_timeout, u_abs_timeout, sizeof(ax->abs_timeout))) {
1396 memset(&ax->abs_timeout, 0, sizeof(ax->abs_timeout));
1399 ax->msg_len = msg_len;
1400 ax->msg_prio = msg_prio;
1402 ax->d.type = AUDIT_MQ_SENDRECV;
1403 ax->d.next = context->aux;
1404 context->aux = (void *)ax;
1409 * __audit_mq_timedreceive - record audit data for a POSIX MQ timed receive
1410 * @mqdes: MQ descriptor
1411 * @msg_len: Message length
1412 * @msg_prio: Message priority
1413 * @abs_timeout: Message timeout in absolute time
1415 * Returns 0 for success or NULL context or < 0 on error.
1417 int __audit_mq_timedreceive(mqd_t mqdes, size_t msg_len,
1418 unsigned int __user *u_msg_prio,
1419 const struct timespec __user *u_abs_timeout)
1421 struct audit_aux_data_mq_sendrecv *ax;
1422 struct audit_context *context = current->audit_context;
1427 if (likely(!context))
1430 ax = kmalloc(sizeof(*ax), GFP_ATOMIC);
1434 if (u_msg_prio != NULL) {
1435 if (get_user(ax->msg_prio, u_msg_prio)) {
1442 if (u_abs_timeout != NULL) {
1443 if (copy_from_user(&ax->abs_timeout, u_abs_timeout, sizeof(ax->abs_timeout))) {
1448 memset(&ax->abs_timeout, 0, sizeof(ax->abs_timeout));
1451 ax->msg_len = msg_len;
1453 ax->d.type = AUDIT_MQ_SENDRECV;
1454 ax->d.next = context->aux;
1455 context->aux = (void *)ax;
1460 * __audit_mq_notify - record audit data for a POSIX MQ notify
1461 * @mqdes: MQ descriptor
1462 * @u_notification: Notification event
1464 * Returns 0 for success or NULL context or < 0 on error.
1467 int __audit_mq_notify(mqd_t mqdes, const struct sigevent __user *u_notification)
1469 struct audit_aux_data_mq_notify *ax;
1470 struct audit_context *context = current->audit_context;
1475 if (likely(!context))
1478 ax = kmalloc(sizeof(*ax), GFP_ATOMIC);
1482 if (u_notification != NULL) {
1483 if (copy_from_user(&ax->notification, u_notification, sizeof(ax->notification))) {
1488 memset(&ax->notification, 0, sizeof(ax->notification));
1492 ax->d.type = AUDIT_MQ_NOTIFY;
1493 ax->d.next = context->aux;
1494 context->aux = (void *)ax;
1499 * __audit_mq_getsetattr - record audit data for a POSIX MQ get/set attribute
1500 * @mqdes: MQ descriptor
1503 * Returns 0 for success or NULL context or < 0 on error.
1505 int __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
1507 struct audit_aux_data_mq_getsetattr *ax;
1508 struct audit_context *context = current->audit_context;
1513 if (likely(!context))
1516 ax = kmalloc(sizeof(*ax), GFP_ATOMIC);
1521 ax->mqstat = *mqstat;
1523 ax->d.type = AUDIT_MQ_GETSETATTR;
1524 ax->d.next = context->aux;
1525 context->aux = (void *)ax;
1530 * audit_ipc_obj - record audit data for ipc object
1531 * @ipcp: ipc permissions
1533 * Returns 0 for success or NULL context or < 0 on error.
1535 int __audit_ipc_obj(struct kern_ipc_perm *ipcp)
1537 struct audit_aux_data_ipcctl *ax;
1538 struct audit_context *context = current->audit_context;
1540 ax = kmalloc(sizeof(*ax), GFP_ATOMIC);
1544 ax->uid = ipcp->uid;
1545 ax->gid = ipcp->gid;
1546 ax->mode = ipcp->mode;
1547 selinux_get_ipc_sid(ipcp, &ax->osid);
1549 ax->d.type = AUDIT_IPC;
1550 ax->d.next = context->aux;
1551 context->aux = (void *)ax;
1556 * audit_ipc_set_perm - record audit data for new ipc permissions
1557 * @qbytes: msgq bytes
1558 * @uid: msgq user id
1559 * @gid: msgq group id
1560 * @mode: msgq mode (permissions)
1562 * Returns 0 for success or NULL context or < 0 on error.
1564 int __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode)
1566 struct audit_aux_data_ipcctl *ax;
1567 struct audit_context *context = current->audit_context;
1569 ax = kmalloc(sizeof(*ax), GFP_ATOMIC);
1573 ax->qbytes = qbytes;
1578 ax->d.type = AUDIT_IPC_SET_PERM;
1579 ax->d.next = context->aux;
1580 context->aux = (void *)ax;
1584 int audit_bprm(struct linux_binprm *bprm)
1586 struct audit_aux_data_execve *ax;
1587 struct audit_context *context = current->audit_context;
1588 unsigned long p, next;
1591 if (likely(!audit_enabled || !context))
1594 ax = kmalloc(sizeof(*ax) + PAGE_SIZE * MAX_ARG_PAGES - bprm->p,
1599 ax->argc = bprm->argc;
1600 ax->envc = bprm->envc;
1601 for (p = bprm->p, to = ax->mem; p < MAX_ARG_PAGES*PAGE_SIZE; p = next) {
1602 struct page *page = bprm->page[p / PAGE_SIZE];
1603 void *kaddr = kmap(page);
1604 next = (p + PAGE_SIZE) & ~(PAGE_SIZE - 1);
1605 memcpy(to, kaddr + (p & (PAGE_SIZE - 1)), next - p);
1610 ax->d.type = AUDIT_EXECVE;
1611 ax->d.next = context->aux;
1612 context->aux = (void *)ax;
1618 * audit_socketcall - record audit data for sys_socketcall
1619 * @nargs: number of args
1622 * Returns 0 for success or NULL context or < 0 on error.
1624 int audit_socketcall(int nargs, unsigned long *args)
1626 struct audit_aux_data_socketcall *ax;
1627 struct audit_context *context = current->audit_context;
1629 if (likely(!context))
1632 ax = kmalloc(sizeof(*ax) + nargs * sizeof(unsigned long), GFP_KERNEL);
1637 memcpy(ax->args, args, nargs * sizeof(unsigned long));
1639 ax->d.type = AUDIT_SOCKETCALL;
1640 ax->d.next = context->aux;
1641 context->aux = (void *)ax;
1646 * audit_sockaddr - record audit data for sys_bind, sys_connect, sys_sendto
1647 * @len: data length in user space
1648 * @a: data address in kernel space
1650 * Returns 0 for success or NULL context or < 0 on error.
1652 int audit_sockaddr(int len, void *a)
1654 struct audit_aux_data_sockaddr *ax;
1655 struct audit_context *context = current->audit_context;
1657 if (likely(!context))
1660 ax = kmalloc(sizeof(*ax) + len, GFP_KERNEL);
1665 memcpy(ax->a, a, len);
1667 ax->d.type = AUDIT_SOCKADDR;
1668 ax->d.next = context->aux;
1669 context->aux = (void *)ax;
1674 * audit_avc_path - record the granting or denial of permissions
1675 * @dentry: dentry to record
1676 * @mnt: mnt to record
1678 * Returns 0 for success or NULL context or < 0 on error.
1680 * Called from security/selinux/avc.c::avc_audit()
1682 int audit_avc_path(struct dentry *dentry, struct vfsmount *mnt)
1684 struct audit_aux_data_path *ax;
1685 struct audit_context *context = current->audit_context;
1687 if (likely(!context))
1690 ax = kmalloc(sizeof(*ax), GFP_ATOMIC);
1694 ax->dentry = dget(dentry);
1695 ax->mnt = mntget(mnt);
1697 ax->d.type = AUDIT_AVC_PATH;
1698 ax->d.next = context->aux;
1699 context->aux = (void *)ax;
1704 * audit_signal_info - record signal info for shutting down audit subsystem
1705 * @sig: signal value
1706 * @t: task being signaled
1708 * If the audit subsystem is being terminated, record the task (pid)
1709 * and uid that is doing that.
1711 void __audit_signal_info(int sig, struct task_struct *t)
1713 extern pid_t audit_sig_pid;
1714 extern uid_t audit_sig_uid;
1715 extern u32 audit_sig_sid;
1717 if (sig == SIGTERM || sig == SIGHUP || sig == SIGUSR1) {
1718 struct task_struct *tsk = current;
1719 struct audit_context *ctx = tsk->audit_context;
1720 audit_sig_pid = tsk->pid;
1722 audit_sig_uid = ctx->loginuid;
1724 audit_sig_uid = tsk->uid;
1725 selinux_get_task_sid(tsk, &audit_sig_sid);