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.
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 * Written by Rickard E. (Rik) Faith <faith@redhat.com>
23 * Many of the ideas implemented here are from Stephen C. Tweedie,
24 * especially the idea of avoiding a copy by using getname.
26 * The method for actual interception of syscall entry and exit (not in
27 * this file -- see entry.S) is based on a GPL'd patch written by
28 * okir@suse.de and Copyright 2003 SuSE Linux AG.
32 #include <linux/init.h>
33 #include <asm/atomic.h>
34 #include <asm/types.h>
36 #include <linux/module.h>
37 #include <linux/socket.h>
38 #include <linux/audit.h>
39 #include <linux/personality.h>
40 #include <linux/time.h>
41 #include <asm/unistd.h>
44 1 = put_count checking
45 2 = verbose put_count checking
49 /* No syscall auditing will take place unless audit_enabled != 0. */
50 extern int audit_enabled
;
52 /* AUDIT_NAMES is the number of slots we reserve in the audit_context
53 * for saving names from getname(). */
54 #define AUDIT_NAMES 20
56 /* AUDIT_NAMES_RESERVED is the number of slots we reserve in the
57 * audit_context from being used for nameless inodes from
59 #define AUDIT_NAMES_RESERVED 7
61 /* At task start time, the audit_state is set in the audit_context using
62 a per-task filter. At syscall entry, the audit_state is augmented by
63 the syscall filter. */
65 AUDIT_DISABLED
, /* Do not create per-task audit_context.
66 * No syscall-specific audit records can
68 AUDIT_SETUP_CONTEXT
, /* Create the per-task audit_context,
69 * but don't necessarily fill it in at
70 * syscall entry time (i.e., filter
72 AUDIT_BUILD_CONTEXT
, /* Create the per-task audit_context,
73 * and always fill it in at syscall
74 * entry time. This makes a full
75 * syscall record available if some
76 * other part of the kernel decides it
77 * should be recorded. */
78 AUDIT_RECORD_CONTEXT
/* Create the per-task audit_context,
79 * always fill it in at syscall entry
80 * time, and always write out the audit
81 * record at syscall exit time. */
84 /* When fs/namei.c:getname() is called, we store the pointer in name and
85 * we don't let putname() free it (instead we free all of the saved
86 * pointers at syscall exit time).
88 * Further, in fs/namei.c:path_lookup() we store the inode and device. */
99 struct audit_aux_data
{
100 struct audit_aux_data
*next
;
104 #define AUDIT_AUX_IPCPERM 0
106 struct audit_aux_data_ipcctl
{
107 struct audit_aux_data d
;
109 unsigned long qbytes
;
115 struct audit_aux_data_socketcall
{
116 struct audit_aux_data d
;
118 unsigned long args
[0];
121 struct audit_aux_data_sockaddr
{
122 struct audit_aux_data d
;
128 /* The per-task audit context. */
129 struct audit_context
{
130 int in_syscall
; /* 1 if task is in a syscall */
131 enum audit_state state
;
132 unsigned int serial
; /* serial number for record */
133 struct timespec ctime
; /* time of syscall entry */
134 uid_t loginuid
; /* login uid (identity) */
135 int major
; /* syscall number */
136 unsigned long argv
[4]; /* syscall arguments */
137 int return_valid
; /* return code is valid */
138 long return_code
;/* syscall return code */
139 int auditable
; /* 1 if record should be written */
141 struct audit_names names
[AUDIT_NAMES
];
142 struct audit_context
*previous
; /* For nested syscalls */
143 struct audit_aux_data
*aux
;
145 /* Save things to print about task_struct */
147 uid_t uid
, euid
, suid
, fsuid
;
148 gid_t gid
, egid
, sgid
, fsgid
;
149 unsigned long personality
;
159 /* There are three lists of rules -- one to search at task creation
160 * time, one to search at syscall entry time, and another to search at
161 * syscall exit time. */
162 static LIST_HEAD(audit_tsklist
);
163 static LIST_HEAD(audit_entlist
);
164 static LIST_HEAD(audit_extlist
);
167 struct list_head list
;
169 struct audit_rule rule
;
172 extern int audit_pid
;
174 /* Check to see if two rules are identical. It is called from
175 * audit_del_rule during AUDIT_DEL. */
176 static int audit_compare_rule(struct audit_rule
*a
, struct audit_rule
*b
)
180 if (a
->flags
!= b
->flags
)
183 if (a
->action
!= b
->action
)
186 if (a
->field_count
!= b
->field_count
)
189 for (i
= 0; i
< a
->field_count
; i
++) {
190 if (a
->fields
[i
] != b
->fields
[i
]
191 || a
->values
[i
] != b
->values
[i
])
195 for (i
= 0; i
< AUDIT_BITMASK_SIZE
; i
++)
196 if (a
->mask
[i
] != b
->mask
[i
])
202 /* Note that audit_add_rule and audit_del_rule are called via
203 * audit_receive() in audit.c, and are protected by
204 * audit_netlink_sem. */
205 static inline int audit_add_rule(struct audit_entry
*entry
,
206 struct list_head
*list
)
208 if (entry
->rule
.flags
& AUDIT_PREPEND
) {
209 entry
->rule
.flags
&= ~AUDIT_PREPEND
;
210 list_add_rcu(&entry
->list
, list
);
212 list_add_tail_rcu(&entry
->list
, list
);
217 static void audit_free_rule(struct rcu_head
*head
)
219 struct audit_entry
*e
= container_of(head
, struct audit_entry
, rcu
);
223 /* Note that audit_add_rule and audit_del_rule are called via
224 * audit_receive() in audit.c, and are protected by
225 * audit_netlink_sem. */
226 static inline int audit_del_rule(struct audit_rule
*rule
,
227 struct list_head
*list
)
229 struct audit_entry
*e
;
231 /* Do not use the _rcu iterator here, since this is the only
232 * deletion routine. */
233 list_for_each_entry(e
, list
, list
) {
234 if (!audit_compare_rule(rule
, &e
->rule
)) {
235 list_del_rcu(&e
->list
);
236 call_rcu(&e
->rcu
, audit_free_rule
);
240 return -EFAULT
; /* No matching rule */
243 /* Copy rule from user-space to kernel-space. Called during
245 static int audit_copy_rule(struct audit_rule
*d
, struct audit_rule
*s
)
249 if (s
->action
!= AUDIT_NEVER
250 && s
->action
!= AUDIT_POSSIBLE
251 && s
->action
!= AUDIT_ALWAYS
)
253 if (s
->field_count
< 0 || s
->field_count
> AUDIT_MAX_FIELDS
)
257 d
->action
= s
->action
;
258 d
->field_count
= s
->field_count
;
259 for (i
= 0; i
< d
->field_count
; i
++) {
260 d
->fields
[i
] = s
->fields
[i
];
261 d
->values
[i
] = s
->values
[i
];
263 for (i
= 0; i
< AUDIT_BITMASK_SIZE
; i
++) d
->mask
[i
] = s
->mask
[i
];
267 int audit_receive_filter(int type
, int pid
, int uid
, int seq
, void *data
,
271 struct audit_entry
*entry
;
276 /* The *_rcu iterators not needed here because we are
277 always called with audit_netlink_sem held. */
278 list_for_each_entry(entry
, &audit_tsklist
, list
)
279 audit_send_reply(pid
, seq
, AUDIT_LIST
, 0, 1,
280 &entry
->rule
, sizeof(entry
->rule
));
281 list_for_each_entry(entry
, &audit_entlist
, list
)
282 audit_send_reply(pid
, seq
, AUDIT_LIST
, 0, 1,
283 &entry
->rule
, sizeof(entry
->rule
));
284 list_for_each_entry(entry
, &audit_extlist
, list
)
285 audit_send_reply(pid
, seq
, AUDIT_LIST
, 0, 1,
286 &entry
->rule
, sizeof(entry
->rule
));
287 audit_send_reply(pid
, seq
, AUDIT_LIST
, 1, 1, NULL
, 0);
290 if (!(entry
= kmalloc(sizeof(*entry
), GFP_KERNEL
)))
292 if (audit_copy_rule(&entry
->rule
, data
)) {
296 flags
= entry
->rule
.flags
;
297 if (!err
&& (flags
& AUDIT_PER_TASK
))
298 err
= audit_add_rule(entry
, &audit_tsklist
);
299 if (!err
&& (flags
& AUDIT_AT_ENTRY
))
300 err
= audit_add_rule(entry
, &audit_entlist
);
301 if (!err
&& (flags
& AUDIT_AT_EXIT
))
302 err
= audit_add_rule(entry
, &audit_extlist
);
303 audit_log(NULL
, AUDIT_CONFIG_CHANGE
,
304 "auid %u added an audit rule\n", loginuid
);
307 flags
=((struct audit_rule
*)data
)->flags
;
308 if (!err
&& (flags
& AUDIT_PER_TASK
))
309 err
= audit_del_rule(data
, &audit_tsklist
);
310 if (!err
&& (flags
& AUDIT_AT_ENTRY
))
311 err
= audit_del_rule(data
, &audit_entlist
);
312 if (!err
&& (flags
& AUDIT_AT_EXIT
))
313 err
= audit_del_rule(data
, &audit_extlist
);
314 audit_log(NULL
, AUDIT_CONFIG_CHANGE
,
315 "auid %u removed an audit rule\n", loginuid
);
324 /* Compare a task_struct with an audit_rule. Return 1 on match, 0
326 static int audit_filter_rules(struct task_struct
*tsk
,
327 struct audit_rule
*rule
,
328 struct audit_context
*ctx
,
329 enum audit_state
*state
)
333 for (i
= 0; i
< rule
->field_count
; i
++) {
334 u32 field
= rule
->fields
[i
] & ~AUDIT_NEGATE
;
335 u32 value
= rule
->values
[i
];
340 result
= (tsk
->pid
== value
);
343 result
= (tsk
->uid
== value
);
346 result
= (tsk
->euid
== value
);
349 result
= (tsk
->suid
== value
);
352 result
= (tsk
->fsuid
== value
);
355 result
= (tsk
->gid
== value
);
358 result
= (tsk
->egid
== value
);
361 result
= (tsk
->sgid
== value
);
364 result
= (tsk
->fsgid
== value
);
367 result
= (tsk
->personality
== value
);
371 result
= (ctx
->arch
== value
);
375 if (ctx
&& ctx
->return_valid
)
376 result
= (ctx
->return_code
== value
);
379 if (ctx
&& ctx
->return_valid
)
380 result
= (ctx
->return_valid
== AUDITSC_SUCCESS
);
384 for (j
= 0; j
< ctx
->name_count
; j
++) {
385 if (MAJOR(ctx
->names
[j
].dev
)==value
) {
394 for (j
= 0; j
< ctx
->name_count
; j
++) {
395 if (MINOR(ctx
->names
[j
].dev
)==value
) {
404 for (j
= 0; j
< ctx
->name_count
; j
++) {
405 if (ctx
->names
[j
].ino
== value
) {
415 result
= (ctx
->loginuid
== value
);
422 result
= (ctx
->argv
[field
-AUDIT_ARG0
]==value
);
426 if (rule
->fields
[i
] & AUDIT_NEGATE
)
431 switch (rule
->action
) {
432 case AUDIT_NEVER
: *state
= AUDIT_DISABLED
; break;
433 case AUDIT_POSSIBLE
: *state
= AUDIT_BUILD_CONTEXT
; break;
434 case AUDIT_ALWAYS
: *state
= AUDIT_RECORD_CONTEXT
; break;
439 /* At process creation time, we can determine if system-call auditing is
440 * completely disabled for this task. Since we only have the task
441 * structure at this point, we can only check uid and gid.
443 static enum audit_state
audit_filter_task(struct task_struct
*tsk
)
445 struct audit_entry
*e
;
446 enum audit_state state
;
449 list_for_each_entry_rcu(e
, &audit_tsklist
, list
) {
450 if (audit_filter_rules(tsk
, &e
->rule
, NULL
, &state
)) {
456 return AUDIT_BUILD_CONTEXT
;
459 /* At syscall entry and exit time, this filter is called if the
460 * audit_state is not low enough that auditing cannot take place, but is
461 * also not high enough that we already know we have to write an audit
462 * record (i.e., the state is AUDIT_SETUP_CONTEXT or AUDIT_BUILD_CONTEXT).
464 static enum audit_state
audit_filter_syscall(struct task_struct
*tsk
,
465 struct audit_context
*ctx
,
466 struct list_head
*list
)
468 struct audit_entry
*e
;
469 enum audit_state state
;
470 int word
= AUDIT_WORD(ctx
->major
);
471 int bit
= AUDIT_BIT(ctx
->major
);
474 list_for_each_entry_rcu(e
, list
, list
) {
475 if ((e
->rule
.mask
[word
] & bit
) == bit
476 && audit_filter_rules(tsk
, &e
->rule
, ctx
, &state
)) {
482 return AUDIT_BUILD_CONTEXT
;
485 /* This should be called with task_lock() held. */
486 static inline struct audit_context
*audit_get_context(struct task_struct
*tsk
,
490 struct audit_context
*context
= tsk
->audit_context
;
492 if (likely(!context
))
494 context
->return_valid
= return_valid
;
495 context
->return_code
= return_code
;
497 if (context
->in_syscall
&& !context
->auditable
) {
498 enum audit_state state
;
499 state
= audit_filter_syscall(tsk
, context
, &audit_extlist
);
500 if (state
== AUDIT_RECORD_CONTEXT
)
501 context
->auditable
= 1;
504 context
->pid
= tsk
->pid
;
505 context
->uid
= tsk
->uid
;
506 context
->gid
= tsk
->gid
;
507 context
->euid
= tsk
->euid
;
508 context
->suid
= tsk
->suid
;
509 context
->fsuid
= tsk
->fsuid
;
510 context
->egid
= tsk
->egid
;
511 context
->sgid
= tsk
->sgid
;
512 context
->fsgid
= tsk
->fsgid
;
513 context
->personality
= tsk
->personality
;
514 tsk
->audit_context
= NULL
;
518 static inline void audit_free_names(struct audit_context
*context
)
523 if (context
->auditable
524 ||context
->put_count
+ context
->ino_count
!= context
->name_count
) {
525 printk(KERN_ERR
"audit.c:%d(:%d): major=%d in_syscall=%d"
526 " name_count=%d put_count=%d"
527 " ino_count=%d [NOT freeing]\n",
529 context
->serial
, context
->major
, context
->in_syscall
,
530 context
->name_count
, context
->put_count
,
532 for (i
= 0; i
< context
->name_count
; i
++)
533 printk(KERN_ERR
"names[%d] = %p = %s\n", i
,
534 context
->names
[i
].name
,
535 context
->names
[i
].name
);
541 context
->put_count
= 0;
542 context
->ino_count
= 0;
545 for (i
= 0; i
< context
->name_count
; i
++)
546 if (context
->names
[i
].name
)
547 __putname(context
->names
[i
].name
);
548 context
->name_count
= 0;
551 static inline void audit_free_aux(struct audit_context
*context
)
553 struct audit_aux_data
*aux
;
555 while ((aux
= context
->aux
)) {
556 context
->aux
= aux
->next
;
561 static inline void audit_zero_context(struct audit_context
*context
,
562 enum audit_state state
)
564 uid_t loginuid
= context
->loginuid
;
566 memset(context
, 0, sizeof(*context
));
567 context
->state
= state
;
568 context
->loginuid
= loginuid
;
571 static inline struct audit_context
*audit_alloc_context(enum audit_state state
)
573 struct audit_context
*context
;
575 if (!(context
= kmalloc(sizeof(*context
), GFP_KERNEL
)))
577 audit_zero_context(context
, state
);
581 /* Filter on the task information and allocate a per-task audit context
582 * if necessary. Doing so turns on system call auditing for the
583 * specified task. This is called from copy_process, so no lock is
585 int audit_alloc(struct task_struct
*tsk
)
587 struct audit_context
*context
;
588 enum audit_state state
;
590 if (likely(!audit_enabled
))
591 return 0; /* Return if not auditing. */
593 state
= audit_filter_task(tsk
);
594 if (likely(state
== AUDIT_DISABLED
))
597 if (!(context
= audit_alloc_context(state
))) {
598 audit_log_lost("out of memory in audit_alloc");
602 /* Preserve login uid */
603 context
->loginuid
= -1;
604 if (current
->audit_context
)
605 context
->loginuid
= current
->audit_context
->loginuid
;
607 tsk
->audit_context
= context
;
608 set_tsk_thread_flag(tsk
, TIF_SYSCALL_AUDIT
);
612 static inline void audit_free_context(struct audit_context
*context
)
614 struct audit_context
*previous
;
618 previous
= context
->previous
;
619 if (previous
|| (count
&& count
< 10)) {
621 printk(KERN_ERR
"audit(:%d): major=%d name_count=%d:"
622 " freeing multiple contexts (%d)\n",
623 context
->serial
, context
->major
,
624 context
->name_count
, count
);
626 audit_free_names(context
);
627 audit_free_aux(context
);
632 printk(KERN_ERR
"audit: freed %d contexts\n", count
);
635 static void audit_log_task_info(struct audit_buffer
*ab
)
637 char name
[sizeof(current
->comm
)];
638 struct mm_struct
*mm
= current
->mm
;
639 struct vm_area_struct
*vma
;
641 get_task_comm(name
, current
);
642 audit_log_format(ab
, " comm=%s", name
);
647 down_read(&mm
->mmap_sem
);
650 if ((vma
->vm_flags
& VM_EXECUTABLE
) &&
652 audit_log_d_path(ab
, "exe=",
653 vma
->vm_file
->f_dentry
,
654 vma
->vm_file
->f_vfsmnt
);
659 up_read(&mm
->mmap_sem
);
662 static void audit_log_exit(struct audit_context
*context
)
665 struct audit_buffer
*ab
;
667 ab
= audit_log_start(context
, AUDIT_SYSCALL
);
669 return; /* audit_panic has been called */
670 audit_log_format(ab
, "syscall=%d", context
->major
);
671 if (context
->personality
!= PER_LINUX
)
672 audit_log_format(ab
, " per=%lx", context
->personality
);
673 audit_log_format(ab
, " arch=%x", context
->arch
);
674 if (context
->return_valid
)
675 audit_log_format(ab
, " success=%s exit=%ld",
676 (context
->return_valid
==AUDITSC_SUCCESS
)?"yes":"no",
677 context
->return_code
);
679 " a0=%lx a1=%lx a2=%lx a3=%lx items=%d"
680 " pid=%d loginuid=%d uid=%d gid=%d"
681 " euid=%d suid=%d fsuid=%d"
682 " egid=%d sgid=%d fsgid=%d",
692 context
->euid
, context
->suid
, context
->fsuid
,
693 context
->egid
, context
->sgid
, context
->fsgid
);
694 audit_log_task_info(ab
);
696 while (context
->aux
) {
697 struct audit_aux_data
*aux
;
701 ab
= audit_log_start(context
, aux
->type
);
703 continue; /* audit_panic has been called */
707 struct audit_aux_data_ipcctl
*axi
= (void *)aux
;
709 " qbytes=%lx iuid=%d igid=%d mode=%x",
710 axi
->qbytes
, axi
->uid
, axi
->gid
, axi
->mode
);
713 case AUDIT_SOCKETCALL
: {
715 struct audit_aux_data_socketcall
*axs
= (void *)aux
;
716 audit_log_format(ab
, "nargs=%d", axs
->nargs
);
717 for (i
=0; i
<axs
->nargs
; i
++)
718 audit_log_format(ab
, " a%d=%lx", i
, axs
->args
[i
]);
721 case AUDIT_SOCKADDR
: {
722 struct audit_aux_data_sockaddr
*axs
= (void *)aux
;
724 audit_log_format(ab
, "saddr=");
725 audit_log_hex(ab
, axs
->a
, axs
->len
);
730 context
->aux
= aux
->next
;
734 for (i
= 0; i
< context
->name_count
; i
++) {
735 ab
= audit_log_start(context
, AUDIT_PATH
);
737 continue; /* audit_panic has been called */
738 audit_log_format(ab
, "item=%d", i
);
739 if (context
->names
[i
].name
) {
740 audit_log_format(ab
, " name=");
741 audit_log_untrustedstring(ab
, context
->names
[i
].name
);
743 if (context
->names
[i
].ino
!= (unsigned long)-1)
744 audit_log_format(ab
, " inode=%lu dev=%02x:%02x mode=%#o"
745 " ouid=%d ogid=%d rdev=%02x:%02x",
746 context
->names
[i
].ino
,
747 MAJOR(context
->names
[i
].dev
),
748 MINOR(context
->names
[i
].dev
),
749 context
->names
[i
].mode
,
750 context
->names
[i
].uid
,
751 context
->names
[i
].gid
,
752 MAJOR(context
->names
[i
].rdev
),
753 MINOR(context
->names
[i
].rdev
));
758 /* Free a per-task audit context. Called from copy_process and
759 * __put_task_struct. */
760 void audit_free(struct task_struct
*tsk
)
762 struct audit_context
*context
;
765 context
= audit_get_context(tsk
, 0, 0);
768 if (likely(!context
))
771 /* Check for system calls that do not go through the exit
772 * function (e.g., exit_group), then free context block. */
773 if (context
->in_syscall
&& context
->auditable
&& context
->pid
!= audit_pid
)
774 audit_log_exit(context
);
776 audit_free_context(context
);
779 /* Compute a serial number for the audit record. Audit records are
780 * written to user-space as soon as they are generated, so a complete
781 * audit record may be written in several pieces. The timestamp of the
782 * record and this serial number are used by the user-space tools to
783 * determine which pieces belong to the same audit record. The
784 * (timestamp,serial) tuple is unique for each syscall and is live from
785 * syscall entry to syscall exit.
787 * Atomic values are only guaranteed to be 24-bit, so we count down.
789 * NOTE: Another possibility is to store the formatted records off the
790 * audit context (for those records that have a context), and emit them
791 * all at syscall exit. However, this could delay the reporting of
792 * significant errors until syscall exit (or never, if the system
794 static inline unsigned int audit_serial(void)
796 static atomic_t serial
= ATOMIC_INIT(0xffffff);
800 a
= atomic_read(&serial
);
801 if (atomic_dec_and_test(&serial
))
802 atomic_set(&serial
, 0xffffff);
803 b
= atomic_read(&serial
);
804 } while (b
!= a
- 1);
809 /* Fill in audit context at syscall entry. This only happens if the
810 * audit context was created when the task was created and the state or
811 * filters demand the audit context be built. If the state from the
812 * per-task filter or from the per-syscall filter is AUDIT_RECORD_CONTEXT,
813 * then the record will be written at syscall exit time (otherwise, it
814 * will only be written if another part of the kernel requests that it
816 void audit_syscall_entry(struct task_struct
*tsk
, int arch
, int major
,
817 unsigned long a1
, unsigned long a2
,
818 unsigned long a3
, unsigned long a4
)
820 struct audit_context
*context
= tsk
->audit_context
;
821 enum audit_state state
;
825 /* This happens only on certain architectures that make system
826 * calls in kernel_thread via the entry.S interface, instead of
827 * with direct calls. (If you are porting to a new
828 * architecture, hitting this condition can indicate that you
829 * got the _exit/_leave calls backward in entry.S.)
833 * ppc64 yes (see arch/ppc64/kernel/misc.S)
835 * This also happens with vm86 emulation in a non-nested manner
836 * (entries without exits), so this case must be caught.
838 if (context
->in_syscall
) {
839 struct audit_context
*newctx
;
841 #if defined(__NR_vm86) && defined(__NR_vm86old)
842 /* vm86 mode should only be entered once */
843 if (major
== __NR_vm86
|| major
== __NR_vm86old
)
848 "audit(:%d) pid=%d in syscall=%d;"
849 " entering syscall=%d\n",
850 context
->serial
, tsk
->pid
, context
->major
, major
);
852 newctx
= audit_alloc_context(context
->state
);
854 newctx
->previous
= context
;
856 tsk
->audit_context
= newctx
;
858 /* If we can't alloc a new context, the best we
859 * can do is to leak memory (any pending putname
860 * will be lost). The only other alternative is
861 * to abandon auditing. */
862 audit_zero_context(context
, context
->state
);
865 BUG_ON(context
->in_syscall
|| context
->name_count
);
870 context
->arch
= arch
;
871 context
->major
= major
;
872 context
->argv
[0] = a1
;
873 context
->argv
[1] = a2
;
874 context
->argv
[2] = a3
;
875 context
->argv
[3] = a4
;
877 state
= context
->state
;
878 if (state
== AUDIT_SETUP_CONTEXT
|| state
== AUDIT_BUILD_CONTEXT
)
879 state
= audit_filter_syscall(tsk
, context
, &audit_entlist
);
880 if (likely(state
== AUDIT_DISABLED
))
883 context
->serial
= audit_serial();
884 context
->ctime
= CURRENT_TIME
;
885 context
->in_syscall
= 1;
886 context
->auditable
= !!(state
== AUDIT_RECORD_CONTEXT
);
889 /* Tear down after system call. If the audit context has been marked as
890 * auditable (either because of the AUDIT_RECORD_CONTEXT state from
891 * filtering, or because some other part of the kernel write an audit
892 * message), then write out the syscall information. In call cases,
893 * free the names stored from getname(). */
894 void audit_syscall_exit(struct task_struct
*tsk
, int valid
, long return_code
)
896 struct audit_context
*context
;
898 get_task_struct(tsk
);
900 context
= audit_get_context(tsk
, valid
, return_code
);
903 /* Not having a context here is ok, since the parent may have
904 * called __put_task_struct. */
905 if (likely(!context
))
908 if (context
->in_syscall
&& context
->auditable
&& context
->pid
!= audit_pid
)
909 audit_log_exit(context
);
911 context
->in_syscall
= 0;
912 context
->auditable
= 0;
914 if (context
->previous
) {
915 struct audit_context
*new_context
= context
->previous
;
916 context
->previous
= NULL
;
917 audit_free_context(context
);
918 tsk
->audit_context
= new_context
;
920 audit_free_names(context
);
921 audit_free_aux(context
);
922 audit_zero_context(context
, context
->state
);
923 tsk
->audit_context
= context
;
925 put_task_struct(tsk
);
928 /* Add a name to the list. Called from fs/namei.c:getname(). */
929 void audit_getname(const char *name
)
931 struct audit_context
*context
= current
->audit_context
;
933 if (!context
|| IS_ERR(name
) || !name
)
936 if (!context
->in_syscall
) {
938 printk(KERN_ERR
"%s:%d(:%d): ignoring getname(%p)\n",
939 __FILE__
, __LINE__
, context
->serial
, name
);
944 BUG_ON(context
->name_count
>= AUDIT_NAMES
);
945 context
->names
[context
->name_count
].name
= name
;
946 context
->names
[context
->name_count
].ino
= (unsigned long)-1;
947 ++context
->name_count
;
950 /* Intercept a putname request. Called from
951 * include/linux/fs.h:putname(). If we have stored the name from
952 * getname in the audit context, then we delay the putname until syscall
954 void audit_putname(const char *name
)
956 struct audit_context
*context
= current
->audit_context
;
959 if (!context
->in_syscall
) {
961 printk(KERN_ERR
"%s:%d(:%d): __putname(%p)\n",
962 __FILE__
, __LINE__
, context
->serial
, name
);
963 if (context
->name_count
) {
965 for (i
= 0; i
< context
->name_count
; i
++)
966 printk(KERN_ERR
"name[%d] = %p = %s\n", i
,
967 context
->names
[i
].name
,
968 context
->names
[i
].name
);
975 ++context
->put_count
;
976 if (context
->put_count
> context
->name_count
) {
977 printk(KERN_ERR
"%s:%d(:%d): major=%d"
978 " in_syscall=%d putname(%p) name_count=%d"
981 context
->serial
, context
->major
,
982 context
->in_syscall
, name
, context
->name_count
,
990 /* Store the inode and device from a lookup. Called from
991 * fs/namei.c:path_lookup(). */
992 void audit_inode(const char *name
, const struct inode
*inode
)
995 struct audit_context
*context
= current
->audit_context
;
997 if (!context
->in_syscall
)
999 if (context
->name_count
1000 && context
->names
[context
->name_count
-1].name
1001 && context
->names
[context
->name_count
-1].name
== name
)
1002 idx
= context
->name_count
- 1;
1003 else if (context
->name_count
> 1
1004 && context
->names
[context
->name_count
-2].name
1005 && context
->names
[context
->name_count
-2].name
== name
)
1006 idx
= context
->name_count
- 2;
1008 /* FIXME: how much do we care about inodes that have no
1009 * associated name? */
1010 if (context
->name_count
>= AUDIT_NAMES
- AUDIT_NAMES_RESERVED
)
1012 idx
= context
->name_count
++;
1013 context
->names
[idx
].name
= NULL
;
1015 ++context
->ino_count
;
1018 context
->names
[idx
].ino
= inode
->i_ino
;
1019 context
->names
[idx
].dev
= inode
->i_sb
->s_dev
;
1020 context
->names
[idx
].mode
= inode
->i_mode
;
1021 context
->names
[idx
].uid
= inode
->i_uid
;
1022 context
->names
[idx
].gid
= inode
->i_gid
;
1023 context
->names
[idx
].rdev
= inode
->i_rdev
;
1026 int audit_get_stamp(struct audit_context
*ctx
,
1027 struct timespec
*t
, unsigned int *serial
)
1030 t
->tv_sec
= ctx
->ctime
.tv_sec
;
1031 t
->tv_nsec
= ctx
->ctime
.tv_nsec
;
1032 *serial
= ctx
->serial
;
1039 int audit_set_loginuid(struct task_struct
*task
, uid_t loginuid
)
1041 if (task
->audit_context
) {
1042 struct audit_buffer
*ab
;
1044 ab
= audit_log_start(NULL
, AUDIT_LOGIN
);
1046 audit_log_format(ab
, "login pid=%d uid=%u "
1047 "old loginuid=%u new loginuid=%u",
1048 task
->pid
, task
->uid
,
1049 task
->audit_context
->loginuid
, loginuid
);
1052 task
->audit_context
->loginuid
= loginuid
;
1057 uid_t
audit_get_loginuid(struct audit_context
*ctx
)
1059 return ctx
? ctx
->loginuid
: -1;
1062 int audit_ipc_perms(unsigned long qbytes
, uid_t uid
, gid_t gid
, mode_t mode
)
1064 struct audit_aux_data_ipcctl
*ax
;
1065 struct audit_context
*context
= current
->audit_context
;
1067 if (likely(!context
))
1070 ax
= kmalloc(sizeof(*ax
), GFP_KERNEL
);
1074 ax
->qbytes
= qbytes
;
1079 ax
->d
.type
= AUDIT_IPC
;
1080 ax
->d
.next
= context
->aux
;
1081 context
->aux
= (void *)ax
;
1085 int audit_socketcall(int nargs
, unsigned long *args
)
1087 struct audit_aux_data_socketcall
*ax
;
1088 struct audit_context
*context
= current
->audit_context
;
1090 if (likely(!context
))
1093 ax
= kmalloc(sizeof(*ax
) + nargs
* sizeof(unsigned long), GFP_KERNEL
);
1098 memcpy(ax
->args
, args
, nargs
* sizeof(unsigned long));
1100 ax
->d
.type
= AUDIT_SOCKETCALL
;
1101 ax
->d
.next
= context
->aux
;
1102 context
->aux
= (void *)ax
;
1106 int audit_sockaddr(int len
, void *a
)
1108 struct audit_aux_data_sockaddr
*ax
;
1109 struct audit_context
*context
= current
->audit_context
;
1111 if (likely(!context
))
1114 ax
= kmalloc(sizeof(*ax
) + len
, GFP_KERNEL
);
1119 memcpy(ax
->a
, a
, len
);
1121 ax
->d
.type
= AUDIT_SOCKADDR
;
1122 ax
->d
.next
= context
->aux
;
1123 context
->aux
= (void *)ax
;
1127 void audit_signal_info(int sig
, struct task_struct
*t
)
1129 extern pid_t audit_sig_pid
;
1130 extern uid_t audit_sig_uid
;
1132 if (unlikely(audit_pid
&& t
->pid
== audit_pid
)) {
1133 if (sig
== SIGTERM
|| sig
== SIGHUP
) {
1134 struct audit_context
*ctx
= current
->audit_context
;
1135 audit_sig_pid
= current
->pid
;
1137 audit_sig_uid
= ctx
->loginuid
;
1139 audit_sig_uid
= current
->uid
;