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Commit 650a10dc authored by Linus Torvalds's avatar Linus Torvalds
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Merge branch 'audit.b63' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/audit-current 

* 'audit.b63' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/audit-current:
  Fix rule eviction order for AUDIT_DIR
  Audit: clean up all op= output to include string quoting
  Audit: move audit_get_nd completely into audit_watch
  audit: seperate audit inode watches into a subfile
  Audit: clean up audit_receive_skb
  Audit: cleanup netlink mesg handling
  Audit: unify the printk of an skb when auditd not around
  Audit: dereferencing krule as if it were an audit_watch
  Audit: better estimation of execve record length
  Audit: fix audit watch use after free
parents 9937ac0c 916d7576
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Showing with 733 additions and 621 deletions
include/linux/audit.h
View file @ 650a10dc
...@@ -599,6 +599,8 @@ extern void audit_log_untrustedstring(struct audit_buffer *ab, ...@@ -599,6 +599,8 @@ extern void audit_log_untrustedstring(struct audit_buffer *ab,
extern void audit_log_d_path(struct audit_buffer *ab, extern void audit_log_d_path(struct audit_buffer *ab,
const char *prefix, const char *prefix,
struct path *path); struct path *path);
extern void audit_log_key(struct audit_buffer *ab,
char *key);
extern void audit_log_lost(const char *message); extern void audit_log_lost(const char *message);
extern int audit_update_lsm_rules(void); extern int audit_update_lsm_rules(void);
...@@ -621,6 +623,7 @@ extern int audit_enabled; ...@@ -621,6 +623,7 @@ extern int audit_enabled;
#define audit_log_n_untrustedstring(a,n,s) do { ; } while (0) #define audit_log_n_untrustedstring(a,n,s) do { ; } while (0)
#define audit_log_untrustedstring(a,s) do { ; } while (0) #define audit_log_untrustedstring(a,s) do { ; } while (0)
#define audit_log_d_path(b, p, d) do { ; } while (0) #define audit_log_d_path(b, p, d) do { ; } while (0)
#define audit_log_key(b, k) do { ; } while (0)
#define audit_enabled 0 #define audit_enabled 0
#endif #endif
#endif #endif
......
kernel/Makefile
View file @ 650a10dc
...@@ -70,7 +70,7 @@ obj-$(CONFIG_RESOURCE_COUNTERS) += res_counter.o ...@@ -70,7 +70,7 @@ obj-$(CONFIG_RESOURCE_COUNTERS) += res_counter.o
obj-$(CONFIG_STOP_MACHINE) += stop_machine.o obj-$(CONFIG_STOP_MACHINE) += stop_machine.o
obj-$(CONFIG_KPROBES_SANITY_TEST) += test_kprobes.o obj-$(CONFIG_KPROBES_SANITY_TEST) += test_kprobes.o
obj-$(CONFIG_AUDIT) += audit.o auditfilter.o obj-$(CONFIG_AUDIT) += audit.o auditfilter.o
obj-$(CONFIG_AUDITSYSCALL) += auditsc.o obj-$(CONFIG_AUDITSYSCALL) += auditsc.o audit_watch.o
obj-$(CONFIG_GCOV_KERNEL) += gcov/ obj-$(CONFIG_GCOV_KERNEL) += gcov/
obj-$(CONFIG_AUDIT_TREE) += audit_tree.o obj-$(CONFIG_AUDIT_TREE) += audit_tree.o
obj-$(CONFIG_KPROBES) += kprobes.o obj-$(CONFIG_KPROBES) += kprobes.o
......
kernel/audit.c
View file @ 650a10dc
...@@ -115,9 +115,6 @@ static atomic_t audit_lost = ATOMIC_INIT(0); ...@@ -115,9 +115,6 @@ static atomic_t audit_lost = ATOMIC_INIT(0);
/* The netlink socket. */ /* The netlink socket. */
static struct sock *audit_sock; static struct sock *audit_sock;
/* Inotify handle. */
struct inotify_handle *audit_ih;
/* Hash for inode-based rules */ /* Hash for inode-based rules */
struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS]; struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
...@@ -136,7 +133,7 @@ static DECLARE_WAIT_QUEUE_HEAD(kauditd_wait); ...@@ -136,7 +133,7 @@ static DECLARE_WAIT_QUEUE_HEAD(kauditd_wait);
static DECLARE_WAIT_QUEUE_HEAD(audit_backlog_wait); static DECLARE_WAIT_QUEUE_HEAD(audit_backlog_wait);
/* Serialize requests from userspace. */ /* Serialize requests from userspace. */
static DEFINE_MUTEX(audit_cmd_mutex); DEFINE_MUTEX(audit_cmd_mutex);
/* AUDIT_BUFSIZ is the size of the temporary buffer used for formatting /* AUDIT_BUFSIZ is the size of the temporary buffer used for formatting
* audit records. Since printk uses a 1024 byte buffer, this buffer * audit records. Since printk uses a 1024 byte buffer, this buffer
...@@ -375,6 +372,25 @@ static void audit_hold_skb(struct sk_buff *skb) ...@@ -375,6 +372,25 @@ static void audit_hold_skb(struct sk_buff *skb)
kfree_skb(skb); kfree_skb(skb);
} }
/*
* For one reason or another this nlh isn't getting delivered to the userspace
* audit daemon, just send it to printk.
*/
static void audit_printk_skb(struct sk_buff *skb)
{
struct nlmsghdr *nlh = nlmsg_hdr(skb);
char *data = NLMSG_DATA(nlh);
if (nlh->nlmsg_type != AUDIT_EOE) {
if (printk_ratelimit())
printk(KERN_NOTICE "type=%d %s\n", nlh->nlmsg_type, data);
else
audit_log_lost("printk limit exceeded\n");
}
audit_hold_skb(skb);
}
static void kauditd_send_skb(struct sk_buff *skb) static void kauditd_send_skb(struct sk_buff *skb)
{ {
int err; int err;
...@@ -427,14 +443,8 @@ static int kauditd_thread(void *dummy) ...@@ -427,14 +443,8 @@ static int kauditd_thread(void *dummy)
if (skb) { if (skb) {
if (audit_pid) if (audit_pid)
kauditd_send_skb(skb); kauditd_send_skb(skb);
else { else
if (printk_ratelimit()) audit_printk_skb(skb);
printk(KERN_NOTICE "%s\n", skb->data + NLMSG_SPACE(0));
else
audit_log_lost("printk limit exceeded\n");
audit_hold_skb(skb);
}
} else { } else {
DECLARE_WAITQUEUE(wait, current); DECLARE_WAITQUEUE(wait, current);
set_current_state(TASK_INTERRUPTIBLE); set_current_state(TASK_INTERRUPTIBLE);
...@@ -495,42 +505,25 @@ int audit_send_list(void *_dest) ...@@ -495,42 +505,25 @@ int audit_send_list(void *_dest)
return 0; return 0;
} }
#ifdef CONFIG_AUDIT_TREE
static int prune_tree_thread(void *unused)
{
mutex_lock(&audit_cmd_mutex);
audit_prune_trees();
mutex_unlock(&audit_cmd_mutex);
return 0;
}
void audit_schedule_prune(void)
{
kthread_run(prune_tree_thread, NULL, "audit_prune_tree");
}
#endif
struct sk_buff *audit_make_reply(int pid, int seq, int type, int done, struct sk_buff *audit_make_reply(int pid, int seq, int type, int done,
int multi, void *payload, int size) int multi, void *payload, int size)
{ {
struct sk_buff *skb; struct sk_buff *skb;
struct nlmsghdr *nlh; struct nlmsghdr *nlh;
int len = NLMSG_SPACE(size);
void *data; void *data;
int flags = multi ? NLM_F_MULTI : 0; int flags = multi ? NLM_F_MULTI : 0;
int t = done ? NLMSG_DONE : type; int t = done ? NLMSG_DONE : type;
skb = alloc_skb(len, GFP_KERNEL); skb = nlmsg_new(size, GFP_KERNEL);
if (!skb) if (!skb)
return NULL; return NULL;
nlh = NLMSG_PUT(skb, pid, seq, t, size); nlh = NLMSG_NEW(skb, pid, seq, t, size, flags);
nlh->nlmsg_flags = flags; data = NLMSG_DATA(nlh);
data = NLMSG_DATA(nlh);
memcpy(data, payload, size); memcpy(data, payload, size);
return skb; return skb;
nlmsg_failure: /* Used by NLMSG_PUT */ nlmsg_failure: /* Used by NLMSG_NEW */
if (skb) if (skb)
kfree_skb(skb); kfree_skb(skb);
return NULL; return NULL;
...@@ -926,28 +919,29 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh) ...@@ -926,28 +919,29 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
} }
/* /*
* Get message from skb (based on rtnetlink_rcv_skb). Each message is * Get message from skb. Each message is processed by audit_receive_msg.
* processed by audit_receive_msg. Malformed skbs with wrong length are * Malformed skbs with wrong length are discarded silently.
* discarded silently.
*/ */
static void audit_receive_skb(struct sk_buff *skb) static void audit_receive_skb(struct sk_buff *skb)
{ {
int err; struct nlmsghdr *nlh;
struct nlmsghdr *nlh; /*
u32 rlen; * len MUST be signed for NLMSG_NEXT to be able to dec it below 0
* if the nlmsg_len was not aligned
*/
int len;
int err;
while (skb->len >= NLMSG_SPACE(0)) { nlh = nlmsg_hdr(skb);
nlh = nlmsg_hdr(skb); len = skb->len;
if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len)
return; while (NLMSG_OK(nlh, len)) {
rlen = NLMSG_ALIGN(nlh->nlmsg_len); err = audit_receive_msg(skb, nlh);
if (rlen > skb->len) /* if err or if this message says it wants a response */
rlen = skb->len; if (err || (nlh->nlmsg_flags & NLM_F_ACK))
if ((err = audit_receive_msg(skb, nlh))) {
netlink_ack(skb, nlh, err); netlink_ack(skb, nlh, err);
} else if (nlh->nlmsg_flags & NLM_F_ACK)
netlink_ack(skb, nlh, 0); nlh = NLMSG_NEXT(nlh, len);
skb_pull(skb, rlen);
} }
} }
...@@ -959,13 +953,6 @@ static void audit_receive(struct sk_buff *skb) ...@@ -959,13 +953,6 @@ static void audit_receive(struct sk_buff *skb)
mutex_unlock(&audit_cmd_mutex); mutex_unlock(&audit_cmd_mutex);
} }
#ifdef CONFIG_AUDITSYSCALL
static const struct inotify_operations audit_inotify_ops = {
.handle_event = audit_handle_ievent,
.destroy_watch = audit_free_parent,
};
#endif
/* Initialize audit support at boot time. */ /* Initialize audit support at boot time. */
static int __init audit_init(void) static int __init audit_init(void)
{ {
...@@ -991,12 +978,6 @@ static int __init audit_init(void) ...@@ -991,12 +978,6 @@ static int __init audit_init(void)
audit_log(NULL, GFP_KERNEL, AUDIT_KERNEL, "initialized"); audit_log(NULL, GFP_KERNEL, AUDIT_KERNEL, "initialized");
#ifdef CONFIG_AUDITSYSCALL
audit_ih = inotify_init(&audit_inotify_ops);
if (IS_ERR(audit_ih))
audit_panic("cannot initialize inotify handle");
#endif
for (i = 0; i < AUDIT_INODE_BUCKETS; i++) for (i = 0; i < AUDIT_INODE_BUCKETS; i++)
INIT_LIST_HEAD(&audit_inode_hash[i]); INIT_LIST_HEAD(&audit_inode_hash[i]);
...@@ -1070,18 +1051,20 @@ static struct audit_buffer * audit_buffer_alloc(struct audit_context *ctx, ...@@ -1070,18 +1051,20 @@ static struct audit_buffer * audit_buffer_alloc(struct audit_context *ctx,
goto err; goto err;
} }
ab->skb = alloc_skb(AUDIT_BUFSIZ, gfp_mask);
if (!ab->skb)
goto err;
ab->ctx = ctx; ab->ctx = ctx;
ab->gfp_mask = gfp_mask; ab->gfp_mask = gfp_mask;
nlh = (struct nlmsghdr *)skb_put(ab->skb, NLMSG_SPACE(0));
nlh->nlmsg_type = type; ab->skb = nlmsg_new(AUDIT_BUFSIZ, gfp_mask);
nlh->nlmsg_flags = 0; if (!ab->skb)
nlh->nlmsg_pid = 0; goto nlmsg_failure;
nlh->nlmsg_seq = 0;
nlh = NLMSG_NEW(ab->skb, 0, 0, type, 0, 0);
return ab; return ab;
nlmsg_failure: /* Used by NLMSG_NEW */
kfree_skb(ab->skb);
ab->skb = NULL;
err: err:
audit_buffer_free(ab); audit_buffer_free(ab);
return NULL; return NULL;
...@@ -1452,6 +1435,15 @@ void audit_log_d_path(struct audit_buffer *ab, const char *prefix, ...@@ -1452,6 +1435,15 @@ void audit_log_d_path(struct audit_buffer *ab, const char *prefix,
kfree(pathname); kfree(pathname);
} }
void audit_log_key(struct audit_buffer *ab, char *key)
{
audit_log_format(ab, " key=");
if (key)
audit_log_untrustedstring(ab, key);
else
audit_log_format(ab, "(null)");
}
/** /**
* audit_log_end - end one audit record * audit_log_end - end one audit record
* @ab: the audit_buffer * @ab: the audit_buffer
...@@ -1475,15 +1467,7 @@ void audit_log_end(struct audit_buffer *ab) ...@@ -1475,15 +1467,7 @@ void audit_log_end(struct audit_buffer *ab)
skb_queue_tail(&audit_skb_queue, ab->skb); skb_queue_tail(&audit_skb_queue, ab->skb);
wake_up_interruptible(&kauditd_wait); wake_up_interruptible(&kauditd_wait);
} else { } else {
if (nlh->nlmsg_type != AUDIT_EOE) { audit_printk_skb(ab->skb);
if (printk_ratelimit()) {
printk(KERN_NOTICE "type=%d %s\n",
nlh->nlmsg_type,
ab->skb->data + NLMSG_SPACE(0));
} else
audit_log_lost("printk limit exceeded\n");
}
audit_hold_skb(ab->skb);
} }
ab->skb = NULL; ab->skb = NULL;
} }
......
kernel/audit.h
View file @ 650a10dc
...@@ -53,18 +53,7 @@ enum audit_state { ...@@ -53,18 +53,7 @@ enum audit_state {
}; };
/* Rule lists */ /* Rule lists */
struct audit_parent; struct audit_watch;
struct audit_watch {
atomic_t count; /* reference count */
char *path; /* insertion path */
dev_t dev; /* associated superblock device */
unsigned long ino; /* associated inode number */
struct audit_parent *parent; /* associated parent */
struct list_head wlist; /* entry in parent->watches list */
struct list_head rules; /* associated rules */
};
struct audit_tree; struct audit_tree;
struct audit_chunk; struct audit_chunk;
...@@ -108,19 +97,28 @@ struct audit_netlink_list { ...@@ -108,19 +97,28 @@ struct audit_netlink_list {
int audit_send_list(void *); int audit_send_list(void *);
struct inotify_watch;
/* Inotify handle */
extern struct inotify_handle *audit_ih;
extern void audit_free_parent(struct inotify_watch *);
extern void audit_handle_ievent(struct inotify_watch *, u32, u32, u32,
const char *, struct inode *);
extern int selinux_audit_rule_update(void); extern int selinux_audit_rule_update(void);
extern struct mutex audit_filter_mutex; extern struct mutex audit_filter_mutex;
extern void audit_free_rule_rcu(struct rcu_head *); extern void audit_free_rule_rcu(struct rcu_head *);
extern struct list_head audit_filter_list[]; extern struct list_head audit_filter_list[];
/* audit watch functions */
extern unsigned long audit_watch_inode(struct audit_watch *watch);
extern dev_t audit_watch_dev(struct audit_watch *watch);
extern void audit_put_watch(struct audit_watch *watch);
extern void audit_get_watch(struct audit_watch *watch);
extern int audit_to_watch(struct audit_krule *krule, char *path, int len, u32 op);
extern int audit_add_watch(struct audit_krule *krule);
extern void audit_remove_watch(struct audit_watch *watch);
extern void audit_remove_watch_rule(struct audit_krule *krule, struct list_head *list);
extern void audit_inotify_unregister(struct list_head *in_list);
extern char *audit_watch_path(struct audit_watch *watch);
extern struct list_head *audit_watch_rules(struct audit_watch *watch);
extern struct audit_entry *audit_dupe_rule(struct audit_krule *old,
struct audit_watch *watch);
#ifdef CONFIG_AUDIT_TREE #ifdef CONFIG_AUDIT_TREE
extern struct audit_chunk *audit_tree_lookup(const struct inode *); extern struct audit_chunk *audit_tree_lookup(const struct inode *);
extern void audit_put_chunk(struct audit_chunk *); extern void audit_put_chunk(struct audit_chunk *);
...@@ -130,10 +128,9 @@ extern int audit_add_tree_rule(struct audit_krule *); ...@@ -130,10 +128,9 @@ extern int audit_add_tree_rule(struct audit_krule *);
extern int audit_remove_tree_rule(struct audit_krule *); extern int audit_remove_tree_rule(struct audit_krule *);
extern void audit_trim_trees(void); extern void audit_trim_trees(void);
extern int audit_tag_tree(char *old, char *new); extern int audit_tag_tree(char *old, char *new);
extern void audit_schedule_prune(void);
extern void audit_prune_trees(void);
extern const char *audit_tree_path(struct audit_tree *); extern const char *audit_tree_path(struct audit_tree *);
extern void audit_put_tree(struct audit_tree *); extern void audit_put_tree(struct audit_tree *);
extern void audit_kill_trees(struct list_head *);
#else #else
#define audit_remove_tree_rule(rule) BUG() #define audit_remove_tree_rule(rule) BUG()
#define audit_add_tree_rule(rule) -EINVAL #define audit_add_tree_rule(rule) -EINVAL
...@@ -142,6 +139,7 @@ extern void audit_put_tree(struct audit_tree *); ...@@ -142,6 +139,7 @@ extern void audit_put_tree(struct audit_tree *);
#define audit_put_tree(tree) (void)0 #define audit_put_tree(tree) (void)0
#define audit_tag_tree(old, new) -EINVAL #define audit_tag_tree(old, new) -EINVAL
#define audit_tree_path(rule) "" /* never called */ #define audit_tree_path(rule) "" /* never called */
#define audit_kill_trees(list) BUG()
#endif #endif
extern char *audit_unpack_string(void **, size_t *, size_t); extern char *audit_unpack_string(void **, size_t *, size_t);
...@@ -160,7 +158,10 @@ static inline int audit_signal_info(int sig, struct task_struct *t) ...@@ -160,7 +158,10 @@ static inline int audit_signal_info(int sig, struct task_struct *t)
return 0; return 0;
} }
extern void audit_filter_inodes(struct task_struct *, struct audit_context *); extern void audit_filter_inodes(struct task_struct *, struct audit_context *);
extern struct list_head *audit_killed_trees(void);
#else #else
#define audit_signal_info(s,t) AUDIT_DISABLED #define audit_signal_info(s,t) AUDIT_DISABLED
#define audit_filter_inodes(t,c) AUDIT_DISABLED #define audit_filter_inodes(t,c) AUDIT_DISABLED
#endif #endif
extern struct mutex audit_cmd_mutex;
kernel/audit_tree.c
View file @ 650a10dc
...@@ -2,6 +2,7 @@ ...@@ -2,6 +2,7 @@
#include <linux/inotify.h> #include <linux/inotify.h>
#include <linux/namei.h> #include <linux/namei.h>
#include <linux/mount.h> #include <linux/mount.h>
#include <linux/kthread.h>
struct audit_tree; struct audit_tree;
struct audit_chunk; struct audit_chunk;
...@@ -441,13 +442,11 @@ static void kill_rules(struct audit_tree *tree) ...@@ -441,13 +442,11 @@ static void kill_rules(struct audit_tree *tree)
if (rule->tree) { if (rule->tree) {
/* not a half-baked one */ /* not a half-baked one */
ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE); ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE);
audit_log_format(ab, "op=remove rule dir="); audit_log_format(ab, "op=");
audit_log_string(ab, "remove rule");
audit_log_format(ab, " dir=");
audit_log_untrustedstring(ab, rule->tree->pathname); audit_log_untrustedstring(ab, rule->tree->pathname);
if (rule->filterkey) { audit_log_key(ab, rule->filterkey);
audit_log_format(ab, " key=");
audit_log_untrustedstring(ab, rule->filterkey);
} else
audit_log_format(ab, " key=(null)");
audit_log_format(ab, " list=%d res=1", rule->listnr); audit_log_format(ab, " list=%d res=1", rule->listnr);
audit_log_end(ab); audit_log_end(ab);
rule->tree = NULL; rule->tree = NULL;
...@@ -519,6 +518,8 @@ static void trim_marked(struct audit_tree *tree) ...@@ -519,6 +518,8 @@ static void trim_marked(struct audit_tree *tree)
} }
} }
static void audit_schedule_prune(void);
/* called with audit_filter_mutex */ /* called with audit_filter_mutex */
int audit_remove_tree_rule(struct audit_krule *rule) int audit_remove_tree_rule(struct audit_krule *rule)
{ {
...@@ -824,10 +825,11 @@ int audit_tag_tree(char *old, char *new) ...@@ -824,10 +825,11 @@ int audit_tag_tree(char *old, char *new)
/* /*
* That gets run when evict_chunk() ends up needing to kill audit_tree. * That gets run when evict_chunk() ends up needing to kill audit_tree.
* Runs from a separate thread, with audit_cmd_mutex held. * Runs from a separate thread.
*/ */
void audit_prune_trees(void) static int prune_tree_thread(void *unused)
{ {
mutex_lock(&audit_cmd_mutex);
mutex_lock(&audit_filter_mutex); mutex_lock(&audit_filter_mutex);
while (!list_empty(&prune_list)) { while (!list_empty(&prune_list)) {
...@@ -844,6 +846,40 @@ void audit_prune_trees(void) ...@@ -844,6 +846,40 @@ void audit_prune_trees(void)
} }
mutex_unlock(&audit_filter_mutex); mutex_unlock(&audit_filter_mutex);
mutex_unlock(&audit_cmd_mutex);
return 0;
}
static void audit_schedule_prune(void)
{
kthread_run(prune_tree_thread, NULL, "audit_prune_tree");
}
/*
* ... and that one is done if evict_chunk() decides to delay until the end
* of syscall. Runs synchronously.
*/
void audit_kill_trees(struct list_head *list)
{
mutex_lock(&audit_cmd_mutex);
mutex_lock(&audit_filter_mutex);
while (!list_empty(list)) {
struct audit_tree *victim;
victim = list_entry(list->next, struct audit_tree, list);
kill_rules(victim);
list_del_init(&victim->list);
mutex_unlock(&audit_filter_mutex);
prune_one(victim);
mutex_lock(&audit_filter_mutex);
}
mutex_unlock(&audit_filter_mutex);
mutex_unlock(&audit_cmd_mutex);
} }
/* /*
...@@ -854,6 +890,8 @@ void audit_prune_trees(void) ...@@ -854,6 +890,8 @@ void audit_prune_trees(void)
static void evict_chunk(struct audit_chunk *chunk) static void evict_chunk(struct audit_chunk *chunk)
{ {
struct audit_tree *owner; struct audit_tree *owner;
struct list_head *postponed = audit_killed_trees();
int need_prune = 0;
int n; int n;
if (chunk->dead) if (chunk->dead)
...@@ -869,15 +907,21 @@ static void evict_chunk(struct audit_chunk *chunk) ...@@ -869,15 +907,21 @@ static void evict_chunk(struct audit_chunk *chunk)
owner->root = NULL; owner->root = NULL;
list_del_init(&owner->same_root); list_del_init(&owner->same_root);
spin_unlock(&hash_lock); spin_unlock(&hash_lock);
kill_rules(owner); if (!postponed) {
list_move(&owner->list, &prune_list); kill_rules(owner);
audit_schedule_prune(); list_move(&owner->list, &prune_list);
need_prune = 1;
} else {
list_move(&owner->list, postponed);
}
spin_lock(&hash_lock); spin_lock(&hash_lock);
} }
list_del_rcu(&chunk->hash); list_del_rcu(&chunk->hash);
for (n = 0; n < chunk->count; n++) for (n = 0; n < chunk->count; n++)
list_del_init(&chunk->owners[n].list); list_del_init(&chunk->owners[n].list);
spin_unlock(&hash_lock); spin_unlock(&hash_lock);
if (need_prune)
audit_schedule_prune();
mutex_unlock(&audit_filter_mutex); mutex_unlock(&audit_filter_mutex);
} }
......
kernel/audit_watch.c 0 → 100644
View file @ 650a10dc
/* audit_watch.c -- watching inodes
*
* Copyright 2003-2009 Red Hat, Inc.
* Copyright 2005 Hewlett-Packard Development Company, L.P.
* Copyright 2005 IBM Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/kernel.h>
#include <linux/audit.h>
#include <linux/kthread.h>
#include <linux/mutex.h>
#include <linux/fs.h>
#include <linux/namei.h>
#include <linux/netlink.h>
#include <linux/sched.h>
#include <linux/inotify.h>
#include <linux/security.h>
#include "audit.h"
/*
* Reference counting:
*
* audit_parent: lifetime is from audit_init_parent() to receipt of an IN_IGNORED
* event. Each audit_watch holds a reference to its associated parent.
*
* audit_watch: if added to lists, lifetime is from audit_init_watch() to
* audit_remove_watch(). Additionally, an audit_watch may exist
* temporarily to assist in searching existing filter data. Each
* audit_krule holds a reference to its associated watch.
*/
struct audit_watch {
atomic_t count; /* reference count */
char *path; /* insertion path */
dev_t dev; /* associated superblock device */
unsigned long ino; /* associated inode number */
struct audit_parent *parent; /* associated parent */
struct list_head wlist; /* entry in parent->watches list */
struct list_head rules; /* associated rules */
};
struct audit_parent {
struct list_head ilist; /* entry in inotify registration list */
struct list_head watches; /* associated watches */
struct inotify_watch wdata; /* inotify watch data */
unsigned flags; /* status flags */
};
/* Inotify handle. */
struct inotify_handle *audit_ih;
/*
* audit_parent status flags:
*
* AUDIT_PARENT_INVALID - set anytime rules/watches are auto-removed due to
* a filesystem event to ensure we're adding audit watches to a valid parent.
* Technically not needed for IN_DELETE_SELF or IN_UNMOUNT events, as we cannot
* receive them while we have nameidata, but must be used for IN_MOVE_SELF which
* we can receive while holding nameidata.
*/
#define AUDIT_PARENT_INVALID 0x001
/* Inotify events we care about. */
#define AUDIT_IN_WATCH IN_MOVE|IN_CREATE|IN_DELETE|IN_DELETE_SELF|IN_MOVE_SELF
static void audit_free_parent(struct inotify_watch *i_watch)
{
struct audit_parent *parent;
parent = container_of(i_watch, struct audit_parent, wdata);
WARN_ON(!list_empty(&parent->watches));
kfree(parent);
}
void audit_get_watch(struct audit_watch *watch)
{
atomic_inc(&watch->count);
}
void audit_put_watch(struct audit_watch *watch)
{
if (atomic_dec_and_test(&watch->count)) {
WARN_ON(watch->parent);
WARN_ON(!list_empty(&watch->rules));
kfree(watch->path);
kfree(watch);
}
}
void audit_remove_watch(struct audit_watch *watch)
{
list_del(&watch->wlist);
put_inotify_watch(&watch->parent->wdata);
watch->parent = NULL;
audit_put_watch(watch); /* match initial get */
}
char *audit_watch_path(struct audit_watch *watch)
{
return watch->path;
}
struct list_head *audit_watch_rules(struct audit_watch *watch)
{
return &watch->rules;
}
unsigned long audit_watch_inode(struct audit_watch *watch)
{
return watch->ino;
}
dev_t audit_watch_dev(struct audit_watch *watch)
{
return watch->dev;
}
/* Initialize a parent watch entry. */
static struct audit_parent *audit_init_parent(struct nameidata *ndp)
{
struct audit_parent *parent;
s32 wd;
parent = kzalloc(sizeof(*parent), GFP_KERNEL);
if (unlikely(!parent))
return ERR_PTR(-ENOMEM);
INIT_LIST_HEAD(&parent->watches);
parent->flags = 0;
inotify_init_watch(&parent->wdata);
/* grab a ref so inotify watch hangs around until we take audit_filter_mutex */
get_inotify_watch(&parent->wdata);
wd = inotify_add_watch(audit_ih, &parent->wdata,
ndp->path.dentry->d_inode, AUDIT_IN_WATCH);
if (wd < 0) {
audit_free_parent(&parent->wdata);
return ERR_PTR(wd);
}
return parent;
}
/* Initialize a watch entry. */
static struct audit_watch *audit_init_watch(char *path)
{
struct audit_watch *watch;
watch = kzalloc(sizeof(*watch), GFP_KERNEL);
if (unlikely(!watch))
return ERR_PTR(-ENOMEM);
INIT_LIST_HEAD(&watch->rules);
atomic_set(&watch->count, 1);
watch->path = path;
watch->dev = (dev_t)-1;
watch->ino = (unsigned long)-1;
return watch;
}
/* Translate a watch string to kernel respresentation. */
int audit_to_watch(struct audit_krule *krule, char *path, int len, u32 op)
{
struct audit_watch *watch;
if (!audit_ih)
return -EOPNOTSUPP;
if (path[0] != '/' || path[len-1] == '/' ||
krule->listnr != AUDIT_FILTER_EXIT ||
op != Audit_equal ||
krule->inode_f || krule->watch || krule->tree)
return -EINVAL;
watch = audit_init_watch(path);
if (IS_ERR(watch))
return PTR_ERR(watch);
audit_get_watch(watch);
krule->watch = watch;
return 0;
}
/* Duplicate the given audit watch. The new watch's rules list is initialized
* to an empty list and wlist is undefined. */
static struct audit_watch *audit_dupe_watch(struct audit_watch *old)
{
char *path;
struct audit_watch *new;
path = kstrdup(old->path, GFP_KERNEL);
if (unlikely(!path))
return ERR_PTR(-ENOMEM);
new = audit_init_watch(path);
if (IS_ERR(new)) {
kfree(path);
goto out;
}
new->dev = old->dev;
new->ino = old->ino;
get_inotify_watch(&old->parent->wdata);
new->parent = old->parent;
out:
return new;
}
static void audit_watch_log_rule_change(struct audit_krule *r, struct audit_watch *w, char *op)
{
if (audit_enabled) {
struct audit_buffer *ab;
ab = audit_log_start(NULL, GFP_NOFS, AUDIT_CONFIG_CHANGE);
audit_log_format(ab, "auid=%u ses=%u op=",
audit_get_loginuid(current),
audit_get_sessionid(current));
audit_log_string(ab, op);
audit_log_format(ab, " path=");
audit_log_untrustedstring(ab, w->path);
audit_log_key(ab, r->filterkey);
audit_log_format(ab, " list=%d res=1", r->listnr);
audit_log_end(ab);
}
}
/* Update inode info in audit rules based on filesystem event. */
static void audit_update_watch(struct audit_parent *parent,
const char *dname, dev_t dev,
unsigned long ino, unsigned invalidating)
{
struct audit_watch *owatch, *nwatch, *nextw;
struct audit_krule *r, *nextr;
struct audit_entry *oentry, *nentry;
mutex_lock(&audit_filter_mutex);
list_for_each_entry_safe(owatch, nextw, &parent->watches, wlist) {
if (audit_compare_dname_path(dname, owatch->path, NULL))
continue;
/* If the update involves invalidating rules, do the inode-based
* filtering now, so we don't omit records. */
if (invalidating && current->audit_context)
audit_filter_inodes(current, current->audit_context);
nwatch = audit_dupe_watch(owatch);
if (IS_ERR(nwatch)) {
mutex_unlock(&audit_filter_mutex);
audit_panic("error updating watch, skipping");
return;
}
nwatch->dev = dev;
nwatch->ino = ino;
list_for_each_entry_safe(r, nextr, &owatch->rules, rlist) {
oentry = container_of(r, struct audit_entry, rule);
list_del(&oentry->rule.rlist);
list_del_rcu(&oentry->list);
nentry = audit_dupe_rule(&oentry->rule, nwatch);
if (IS_ERR(nentry)) {
list_del(&oentry->rule.list);
audit_panic("error updating watch, removing");
} else {
int h = audit_hash_ino((u32)ino);
list_add(&nentry->rule.rlist, &nwatch->rules);
list_add_rcu(&nentry->list, &audit_inode_hash[h]);
list_replace(&oentry->rule.list,
&nentry->rule.list);
}
audit_watch_log_rule_change(r, owatch, "updated rules");
call_rcu(&oentry->rcu, audit_free_rule_rcu);
}
audit_remove_watch(owatch);
goto add_watch_to_parent; /* event applies to a single watch */
}
mutex_unlock(&audit_filter_mutex);
return;
add_watch_to_parent:
list_add(&nwatch->wlist, &parent->watches);
mutex_unlock(&audit_filter_mutex);
return;
}
/* Remove all watches & rules associated with a parent that is going away. */
static void audit_remove_parent_watches(struct audit_parent *parent)
{
struct audit_watch *w, *nextw;
struct audit_krule *r, *nextr;
struct audit_entry *e;
mutex_lock(&audit_filter_mutex);
parent->flags |= AUDIT_PARENT_INVALID;
list_for_each_entry_safe(w, nextw, &parent->watches, wlist) {
list_for_each_entry_safe(r, nextr, &w->rules, rlist) {
e = container_of(r, struct audit_entry, rule);
audit_watch_log_rule_change(r, w, "remove rule");
list_del(&r->rlist);
list_del(&r->list);
list_del_rcu(&e->list);
call_rcu(&e->rcu, audit_free_rule_rcu);
}
audit_remove_watch(w);
}
mutex_unlock(&audit_filter_mutex);
}
/* Unregister inotify watches for parents on in_list.
* Generates an IN_IGNORED event. */
void audit_inotify_unregister(struct list_head *in_list)
{
struct audit_parent *p, *n;
list_for_each_entry_safe(p, n, in_list, ilist) {
list_del(&p->ilist);
inotify_rm_watch(audit_ih, &p->wdata);
/* the unpin matching the pin in audit_do_del_rule() */
unpin_inotify_watch(&p->wdata);
}
}
/* Get path information necessary for adding watches. */
static int audit_get_nd(char *path, struct nameidata **ndp, struct nameidata **ndw)
{
struct nameidata *ndparent, *ndwatch;
int err;
ndparent = kmalloc(sizeof(*ndparent), GFP_KERNEL);
if (unlikely(!ndparent))
return -ENOMEM;
ndwatch = kmalloc(sizeof(*ndwatch), GFP_KERNEL);
if (unlikely(!ndwatch)) {
kfree(ndparent);
return -ENOMEM;
}
err = path_lookup(path, LOOKUP_PARENT, ndparent);
if (err) {
kfree(ndparent);
kfree(ndwatch);
return err;
}
err = path_lookup(path, 0, ndwatch);
if (err) {
kfree(ndwatch);
ndwatch = NULL;
}
*ndp = ndparent;
*ndw = ndwatch;
return 0;
}
/* Release resources used for watch path information. */
static void audit_put_nd(struct nameidata *ndp, struct nameidata *ndw)
{
if (ndp) {
path_put(&ndp->path);
kfree(ndp);
}
if (ndw) {
path_put(&ndw->path);
kfree(ndw);
}
}
/* Associate the given rule with an existing parent inotify_watch.
* Caller must hold audit_filter_mutex. */
static void audit_add_to_parent(struct audit_krule *krule,
struct audit_parent *parent)
{
struct audit_watch *w, *watch = krule->watch;
int watch_found = 0;
list_for_each_entry(w, &parent->watches, wlist) {
if (strcmp(watch->path, w->path))
continue;
watch_found = 1;
/* put krule's and initial refs to temporary watch */
audit_put_watch(watch);
audit_put_watch(watch);
audit_get_watch(w);
krule->watch = watch = w;
break;
}
if (!watch_found) {
get_inotify_watch(&parent->wdata);
watch->parent = parent;
list_add(&watch->wlist, &parent->watches);
}
list_add(&krule->rlist, &watch->rules);
}
/* Find a matching watch entry, or add this one.
* Caller must hold audit_filter_mutex. */
int audit_add_watch(struct audit_krule *krule)
{
struct audit_watch *watch = krule->watch;
struct inotify_watch *i_watch;
struct audit_parent *parent;
struct nameidata *ndp = NULL, *ndw = NULL;
int ret = 0;
mutex_unlock(&audit_filter_mutex);
/* Avoid calling path_lookup under audit_filter_mutex. */
ret = audit_get_nd(watch->path, &ndp, &ndw);
if (ret) {
/* caller expects mutex locked */
mutex_lock(&audit_filter_mutex);
goto error;
}
/* update watch filter fields */
if (ndw) {
watch->dev = ndw->path.dentry->d_inode->i_sb->s_dev;
watch->ino = ndw->path.dentry->d_inode->i_ino;
}
/* The audit_filter_mutex must not be held during inotify calls because
* we hold it during inotify event callback processing. If an existing
* inotify watch is found, inotify_find_watch() grabs a reference before
* returning.
*/
if (inotify_find_watch(audit_ih, ndp->path.dentry->d_inode,
&i_watch) < 0) {
parent = audit_init_parent(ndp);
if (IS_ERR(parent)) {
/* caller expects mutex locked */
mutex_lock(&audit_filter_mutex);
ret = PTR_ERR(parent);
goto error;
}
} else
parent = container_of(i_watch, struct audit_parent, wdata);
mutex_lock(&audit_filter_mutex);
/* parent was moved before we took audit_filter_mutex */
if (parent->flags & AUDIT_PARENT_INVALID)
ret = -ENOENT;
else
audit_add_to_parent(krule, parent);
/* match get in audit_init_parent or inotify_find_watch */
put_inotify_watch(&parent->wdata);
error:
audit_put_nd(ndp, ndw); /* NULL args OK */
return ret;
}
void audit_remove_watch_rule(struct audit_krule *krule, struct list_head *list)
{
struct audit_watch *watch = krule->watch;
struct audit_parent *parent = watch->parent;
list_del(&krule->rlist);
if (list_empty(&watch->rules)) {
audit_remove_watch(watch);
if (list_empty(&parent->watches)) {
/* Put parent on the inotify un-registration
* list. Grab a reference before releasing
* audit_filter_mutex, to be released in
* audit_inotify_unregister().
* If filesystem is going away, just leave
* the sucker alone, eviction will take
* care of it. */
if (pin_inotify_watch(&parent->wdata))
list_add(&parent->ilist, list);
}
}
}
/* Update watch data in audit rules based on inotify events. */
static void audit_handle_ievent(struct inotify_watch *i_watch, u32 wd, u32 mask,
u32 cookie, const char *dname, struct inode *inode)
{
struct audit_parent *parent;
parent = container_of(i_watch, struct audit_parent, wdata);
if (mask & (IN_CREATE|IN_MOVED_TO) && inode)
audit_update_watch(parent, dname, inode->i_sb->s_dev,
inode->i_ino, 0);
else if (mask & (IN_DELETE|IN_MOVED_FROM))
audit_update_watch(parent, dname, (dev_t)-1, (unsigned long)-1, 1);
/* inotify automatically removes the watch and sends IN_IGNORED */
else if (mask & (IN_DELETE_SELF|IN_UNMOUNT))
audit_remove_parent_watches(parent);
/* inotify does not remove the watch, so remove it manually */
else if(mask & IN_MOVE_SELF) {
audit_remove_parent_watches(parent);
inotify_remove_watch_locked(audit_ih, i_watch);
} else if (mask & IN_IGNORED)
put_inotify_watch(i_watch);
}
static const struct inotify_operations audit_inotify_ops = {
.handle_event = audit_handle_ievent,
.destroy_watch = audit_free_parent,
};
static int __init audit_watch_init(void)
{
audit_ih = inotify_init(&audit_inotify_ops);
if (IS_ERR(audit_ih))
audit_panic("cannot initialize inotify handle");
return 0;
}
subsys_initcall(audit_watch_init);
kernel/auditfilter.c
View file @ 650a10dc
...@@ -27,7 +27,6 @@ ...@@ -27,7 +27,6 @@
#include <linux/namei.h> #include <linux/namei.h>
#include <linux/netlink.h> #include <linux/netlink.h>
#include <linux/sched.h> #include <linux/sched.h>
#include <linux/inotify.h>
#include <linux/security.h> #include <linux/security.h>
#include "audit.h" #include "audit.h"
...@@ -44,36 +43,6 @@ ...@@ -44,36 +43,6 @@
* be written directly provided audit_filter_mutex is held. * be written directly provided audit_filter_mutex is held.
*/ */
/*
* Reference counting:
*
* audit_parent: lifetime is from audit_init_parent() to receipt of an IN_IGNORED
* event. Each audit_watch holds a reference to its associated parent.
*
* audit_watch: if added to lists, lifetime is from audit_init_watch() to
* audit_remove_watch(). Additionally, an audit_watch may exist
* temporarily to assist in searching existing filter data. Each
* audit_krule holds a reference to its associated watch.
*/
struct audit_parent {
struct list_head ilist; /* entry in inotify registration list */
struct list_head watches; /* associated watches */
struct inotify_watch wdata; /* inotify watch data */
unsigned flags; /* status flags */
};
/*
* audit_parent status flags:
*
* AUDIT_PARENT_INVALID - set anytime rules/watches are auto-removed due to
* a filesystem event to ensure we're adding audit watches to a valid parent.
* Technically not needed for IN_DELETE_SELF or IN_UNMOUNT events, as we cannot
* receive them while we have nameidata, but must be used for IN_MOVE_SELF which
* we can receive while holding nameidata.
*/
#define AUDIT_PARENT_INVALID 0x001
/* Audit filter lists, defined in <linux/audit.h> */ /* Audit filter lists, defined in <linux/audit.h> */
struct list_head audit_filter_list[AUDIT_NR_FILTERS] = { struct list_head audit_filter_list[AUDIT_NR_FILTERS] = {
LIST_HEAD_INIT(audit_filter_list[0]), LIST_HEAD_INIT(audit_filter_list[0]),
...@@ -97,41 +66,6 @@ static struct list_head audit_rules_list[AUDIT_NR_FILTERS] = { ...@@ -97,41 +66,6 @@ static struct list_head audit_rules_list[AUDIT_NR_FILTERS] = {
DEFINE_MUTEX(audit_filter_mutex); DEFINE_MUTEX(audit_filter_mutex);
/* Inotify events we care about. */
#define AUDIT_IN_WATCH IN_MOVE|IN_CREATE|IN_DELETE|IN_DELETE_SELF|IN_MOVE_SELF
void audit_free_parent(struct inotify_watch *i_watch)
{
struct audit_parent *parent;
parent = container_of(i_watch, struct audit_parent, wdata);
WARN_ON(!list_empty(&parent->watches));
kfree(parent);
}
static inline void audit_get_watch(struct audit_watch *watch)
{
atomic_inc(&watch->count);
}
static void audit_put_watch(struct audit_watch *watch)
{
if (atomic_dec_and_test(&watch->count)) {
WARN_ON(watch->parent);
WARN_ON(!list_empty(&watch->rules));
kfree(watch->path);
kfree(watch);
}
}
static void audit_remove_watch(struct audit_watch *watch)
{
list_del(&watch->wlist);
put_inotify_watch(&watch->parent->wdata);
watch->parent = NULL;
audit_put_watch(watch); /* match initial get */
}
static inline void audit_free_rule(struct audit_entry *e) static inline void audit_free_rule(struct audit_entry *e)
{ {
int i; int i;
...@@ -156,50 +90,6 @@ void audit_free_rule_rcu(struct rcu_head *head) ...@@ -156,50 +90,6 @@ void audit_free_rule_rcu(struct rcu_head *head)
audit_free_rule(e); audit_free_rule(e);
} }
/* Initialize a parent watch entry. */
static struct audit_parent *audit_init_parent(struct nameidata *ndp)
{
struct audit_parent *parent;
s32 wd;
parent = kzalloc(sizeof(*parent), GFP_KERNEL);
if (unlikely(!parent))
return ERR_PTR(-ENOMEM);
INIT_LIST_HEAD(&parent->watches);
parent->flags = 0;
inotify_init_watch(&parent->wdata);
/* grab a ref so inotify watch hangs around until we take audit_filter_mutex */
get_inotify_watch(&parent->wdata);
wd = inotify_add_watch(audit_ih, &parent->wdata,
ndp->path.dentry->d_inode, AUDIT_IN_WATCH);
if (wd < 0) {
audit_free_parent(&parent->wdata);
return ERR_PTR(wd);
}
return parent;
}
/* Initialize a watch entry. */
static struct audit_watch *audit_init_watch(char *path)
{
struct audit_watch *watch;
watch = kzalloc(sizeof(*watch), GFP_KERNEL);
if (unlikely(!watch))
return ERR_PTR(-ENOMEM);
INIT_LIST_HEAD(&watch->rules);
atomic_set(&watch->count, 1);
watch->path = path;
watch->dev = (dev_t)-1;
watch->ino = (unsigned long)-1;
return watch;
}
/* Initialize an audit filterlist entry. */ /* Initialize an audit filterlist entry. */
static inline struct audit_entry *audit_init_entry(u32 field_count) static inline struct audit_entry *audit_init_entry(u32 field_count)
{ {
...@@ -260,31 +150,6 @@ static inline int audit_to_inode(struct audit_krule *krule, ...@@ -260,31 +150,6 @@ static inline int audit_to_inode(struct audit_krule *krule,
return 0; return 0;
} }
/* Translate a watch string to kernel respresentation. */
static int audit_to_watch(struct audit_krule *krule, char *path, int len,
u32 op)
{
struct audit_watch *watch;
if (!audit_ih)
return -EOPNOTSUPP;
if (path[0] != '/' || path[len-1] == '/' ||
krule->listnr != AUDIT_FILTER_EXIT ||
op != Audit_equal ||
krule->inode_f || krule->watch || krule->tree)
return -EINVAL;
watch = audit_init_watch(path);
if (IS_ERR(watch))
return PTR_ERR(watch);
audit_get_watch(watch);
krule->watch = watch;
return 0;
}
static __u32 *classes[AUDIT_SYSCALL_CLASSES]; static __u32 *classes[AUDIT_SYSCALL_CLASSES];
int __init audit_register_class(int class, unsigned *list) int __init audit_register_class(int class, unsigned *list)
...@@ -766,7 +631,8 @@ static struct audit_rule_data *audit_krule_to_data(struct audit_krule *krule) ...@@ -766,7 +631,8 @@ static struct audit_rule_data *audit_krule_to_data(struct audit_krule *krule)
break; break;
case AUDIT_WATCH: case AUDIT_WATCH:
data->buflen += data->values[i] = data->buflen += data->values[i] =
audit_pack_string(&bufp, krule->watch->path); audit_pack_string(&bufp,
audit_watch_path(krule->watch));
break; break;
case AUDIT_DIR: case AUDIT_DIR:
data->buflen += data->values[i] = data->buflen += data->values[i] =
...@@ -818,7 +684,8 @@ static int audit_compare_rule(struct audit_krule *a, struct audit_krule *b) ...@@ -818,7 +684,8 @@ static int audit_compare_rule(struct audit_krule *a, struct audit_krule *b)
return 1; return 1;
break; break;
case AUDIT_WATCH: case AUDIT_WATCH:
if (strcmp(a->watch->path, b->watch->path)) if (strcmp(audit_watch_path(a->watch),
audit_watch_path(b->watch)))
return 1; return 1;
break; break;
case AUDIT_DIR: case AUDIT_DIR:
...@@ -844,32 +711,6 @@ static int audit_compare_rule(struct audit_krule *a, struct audit_krule *b) ...@@ -844,32 +711,6 @@ static int audit_compare_rule(struct audit_krule *a, struct audit_krule *b)
return 0; return 0;
} }
/* Duplicate the given audit watch. The new watch's rules list is initialized
* to an empty list and wlist is undefined. */
static struct audit_watch *audit_dupe_watch(struct audit_watch *old)
{
char *path;
struct audit_watch *new;
path = kstrdup(old->path, GFP_KERNEL);
if (unlikely(!path))
return ERR_PTR(-ENOMEM);
new = audit_init_watch(path);
if (IS_ERR(new)) {
kfree(path);
goto out;
}
new->dev = old->dev;
new->ino = old->ino;
get_inotify_watch(&old->parent->wdata);
new->parent = old->parent;
out:
return new;
}
/* Duplicate LSM field information. The lsm_rule is opaque, so must be /* Duplicate LSM field information. The lsm_rule is opaque, so must be
* re-initialized. */ * re-initialized. */
static inline int audit_dupe_lsm_field(struct audit_field *df, static inline int audit_dupe_lsm_field(struct audit_field *df,
...@@ -904,8 +745,8 @@ static inline int audit_dupe_lsm_field(struct audit_field *df, ...@@ -904,8 +745,8 @@ static inline int audit_dupe_lsm_field(struct audit_field *df,
* rule with the new rule in the filterlist, then free the old rule. * rule with the new rule in the filterlist, then free the old rule.
* The rlist element is undefined; list manipulations are handled apart from * The rlist element is undefined; list manipulations are handled apart from
* the initial copy. */ * the initial copy. */
static struct audit_entry *audit_dupe_rule(struct audit_krule *old, struct audit_entry *audit_dupe_rule(struct audit_krule *old,
struct audit_watch *watch) struct audit_watch *watch)
{ {
u32 fcount = old->field_count; u32 fcount = old->field_count;
struct audit_entry *entry; struct audit_entry *entry;
...@@ -977,137 +818,6 @@ static struct audit_entry *audit_dupe_rule(struct audit_krule *old, ...@@ -977,137 +818,6 @@ static struct audit_entry *audit_dupe_rule(struct audit_krule *old,
return entry; return entry;
} }
/* Update inode info in audit rules based on filesystem event. */
static void audit_update_watch(struct audit_parent *parent,
const char *dname, dev_t dev,
unsigned long ino, unsigned invalidating)
{
struct audit_watch *owatch, *nwatch, *nextw;
struct audit_krule *r, *nextr;
struct audit_entry *oentry, *nentry;
mutex_lock(&audit_filter_mutex);
list_for_each_entry_safe(owatch, nextw, &parent->watches, wlist) {
if (audit_compare_dname_path(dname, owatch->path, NULL))
continue;
/* If the update involves invalidating rules, do the inode-based
* filtering now, so we don't omit records. */
if (invalidating && current->audit_context)
audit_filter_inodes(current, current->audit_context);
nwatch = audit_dupe_watch(owatch);
if (IS_ERR(nwatch)) {
mutex_unlock(&audit_filter_mutex);
audit_panic("error updating watch, skipping");
return;
}
nwatch->dev = dev;
nwatch->ino = ino;
list_for_each_entry_safe(r, nextr, &owatch->rules, rlist) {
oentry = container_of(r, struct audit_entry, rule);
list_del(&oentry->rule.rlist);
list_del_rcu(&oentry->list);
nentry = audit_dupe_rule(&oentry->rule, nwatch);
if (IS_ERR(nentry)) {
list_del(&oentry->rule.list);
audit_panic("error updating watch, removing");
} else {
int h = audit_hash_ino((u32)ino);
list_add(&nentry->rule.rlist, &nwatch->rules);
list_add_rcu(&nentry->list, &audit_inode_hash[h]);
list_replace(&oentry->rule.list,
&nentry->rule.list);
}
call_rcu(&oentry->rcu, audit_free_rule_rcu);
}
if (audit_enabled) {
struct audit_buffer *ab;
ab = audit_log_start(NULL, GFP_NOFS,
AUDIT_CONFIG_CHANGE);
audit_log_format(ab, "auid=%u ses=%u",
audit_get_loginuid(current),
audit_get_sessionid(current));
audit_log_format(ab,
" op=updated rules specifying path=");
audit_log_untrustedstring(ab, owatch->path);
audit_log_format(ab, " with dev=%u ino=%lu\n",
dev, ino);
audit_log_format(ab, " list=%d res=1", r->listnr);
audit_log_end(ab);
}
audit_remove_watch(owatch);
goto add_watch_to_parent; /* event applies to a single watch */
}
mutex_unlock(&audit_filter_mutex);
return;
add_watch_to_parent:
list_add(&nwatch->wlist, &parent->watches);
mutex_unlock(&audit_filter_mutex);
return;
}
/* Remove all watches & rules associated with a parent that is going away. */
static void audit_remove_parent_watches(struct audit_parent *parent)
{
struct audit_watch *w, *nextw;
struct audit_krule *r, *nextr;
struct audit_entry *e;
mutex_lock(&audit_filter_mutex);
parent->flags |= AUDIT_PARENT_INVALID;
list_for_each_entry_safe(w, nextw, &parent->watches, wlist) {
list_for_each_entry_safe(r, nextr, &w->rules, rlist) {
e = container_of(r, struct audit_entry, rule);
if (audit_enabled) {
struct audit_buffer *ab;
ab = audit_log_start(NULL, GFP_NOFS,
AUDIT_CONFIG_CHANGE);
audit_log_format(ab, "auid=%u ses=%u",
audit_get_loginuid(current),
audit_get_sessionid(current));
audit_log_format(ab, " op=remove rule path=");
audit_log_untrustedstring(ab, w->path);
if (r->filterkey) {
audit_log_format(ab, " key=");
audit_log_untrustedstring(ab,
r->filterkey);
} else
audit_log_format(ab, " key=(null)");
audit_log_format(ab, " list=%d res=1",
r->listnr);
audit_log_end(ab);
}
list_del(&r->rlist);
list_del(&r->list);
list_del_rcu(&e->list);
call_rcu(&e->rcu, audit_free_rule_rcu);
}
audit_remove_watch(w);
}
mutex_unlock(&audit_filter_mutex);
}
/* Unregister inotify watches for parents on in_list.
* Generates an IN_IGNORED event. */
static void audit_inotify_unregister(struct list_head *in_list)
{
struct audit_parent *p, *n;
list_for_each_entry_safe(p, n, in_list, ilist) {
list_del(&p->ilist);
inotify_rm_watch(audit_ih, &p->wdata);
/* the unpin matching the pin in audit_do_del_rule() */
unpin_inotify_watch(&p->wdata);
}
}
/* Find an existing audit rule. /* Find an existing audit rule.
* Caller must hold audit_filter_mutex to prevent stale rule data. */ * Caller must hold audit_filter_mutex to prevent stale rule data. */
static struct audit_entry *audit_find_rule(struct audit_entry *entry, static struct audit_entry *audit_find_rule(struct audit_entry *entry,
...@@ -1145,134 +855,6 @@ static struct audit_entry *audit_find_rule(struct audit_entry *entry, ...@@ -1145,134 +855,6 @@ static struct audit_entry *audit_find_rule(struct audit_entry *entry,
return found; return found;
} }
/* Get path information necessary for adding watches. */
static int audit_get_nd(char *path, struct nameidata **ndp,
struct nameidata **ndw)
{
struct nameidata *ndparent, *ndwatch;
int err;
ndparent = kmalloc(sizeof(*ndparent), GFP_KERNEL);
if (unlikely(!ndparent))
return -ENOMEM;
ndwatch = kmalloc(sizeof(*ndwatch), GFP_KERNEL);
if (unlikely(!ndwatch)) {
kfree(ndparent);
return -ENOMEM;
}
err = path_lookup(path, LOOKUP_PARENT, ndparent);
if (err) {
kfree(ndparent);
kfree(ndwatch);
return err;
}
err = path_lookup(path, 0, ndwatch);
if (err) {
kfree(ndwatch);
ndwatch = NULL;
}
*ndp = ndparent;
*ndw = ndwatch;
return 0;
}
/* Release resources used for watch path information. */
static void audit_put_nd(struct nameidata *ndp, struct nameidata *ndw)
{
if (ndp) {
path_put(&ndp->path);
kfree(ndp);
}
if (ndw) {
path_put(&ndw->path);
kfree(ndw);
}
}
/* Associate the given rule with an existing parent inotify_watch.
* Caller must hold audit_filter_mutex. */
static void audit_add_to_parent(struct audit_krule *krule,
struct audit_parent *parent)
{
struct audit_watch *w, *watch = krule->watch;
int watch_found = 0;
list_for_each_entry(w, &parent->watches, wlist) {
if (strcmp(watch->path, w->path))
continue;
watch_found = 1;
/* put krule's and initial refs to temporary watch */
audit_put_watch(watch);
audit_put_watch(watch);
audit_get_watch(w);
krule->watch = watch = w;
break;
}
if (!watch_found) {
get_inotify_watch(&parent->wdata);
watch->parent = parent;
list_add(&watch->wlist, &parent->watches);
}
list_add(&krule->rlist, &watch->rules);
}
/* Find a matching watch entry, or add this one.
* Caller must hold audit_filter_mutex. */
static int audit_add_watch(struct audit_krule *krule, struct nameidata *ndp,
struct nameidata *ndw)
{
struct audit_watch *watch = krule->watch;
struct inotify_watch *i_watch;
struct audit_parent *parent;
int ret = 0;
/* update watch filter fields */
if (ndw) {
watch->dev = ndw->path.dentry->d_inode->i_sb->s_dev;
watch->ino = ndw->path.dentry->d_inode->i_ino;
}
/* The audit_filter_mutex must not be held during inotify calls because
* we hold it during inotify event callback processing. If an existing
* inotify watch is found, inotify_find_watch() grabs a reference before
* returning.
*/
mutex_unlock(&audit_filter_mutex);
if (inotify_find_watch(audit_ih, ndp->path.dentry->d_inode,
&i_watch) < 0) {
parent = audit_init_parent(ndp);
if (IS_ERR(parent)) {
/* caller expects mutex locked */
mutex_lock(&audit_filter_mutex);
return PTR_ERR(parent);
}
} else
parent = container_of(i_watch, struct audit_parent, wdata);
mutex_lock(&audit_filter_mutex);
/* parent was moved before we took audit_filter_mutex */
if (parent->flags & AUDIT_PARENT_INVALID)
ret = -ENOENT;
else
audit_add_to_parent(krule, parent);
/* match get in audit_init_parent or inotify_find_watch */
put_inotify_watch(&parent->wdata);
return ret;
}
static u64 prio_low = ~0ULL/2; static u64 prio_low = ~0ULL/2;
static u64 prio_high = ~0ULL/2 - 1; static u64 prio_high = ~0ULL/2 - 1;
...@@ -1282,7 +864,6 @@ static inline int audit_add_rule(struct audit_entry *entry) ...@@ -1282,7 +864,6 @@ static inline int audit_add_rule(struct audit_entry *entry)
struct audit_entry *e; struct audit_entry *e;
struct audit_watch *watch = entry->rule.watch; struct audit_watch *watch = entry->rule.watch;
struct audit_tree *tree = entry->rule.tree; struct audit_tree *tree = entry->rule.tree;
struct nameidata *ndp = NULL, *ndw = NULL;
struct list_head *list; struct list_head *list;
int h, err; int h, err;
#ifdef CONFIG_AUDITSYSCALL #ifdef CONFIG_AUDITSYSCALL
...@@ -1296,8 +877,8 @@ static inline int audit_add_rule(struct audit_entry *entry) ...@@ -1296,8 +877,8 @@ static inline int audit_add_rule(struct audit_entry *entry)
mutex_lock(&audit_filter_mutex); mutex_lock(&audit_filter_mutex);
e = audit_find_rule(entry, &list); e = audit_find_rule(entry, &list);
mutex_unlock(&audit_filter_mutex);
if (e) { if (e) {
mutex_unlock(&audit_filter_mutex);
err = -EEXIST; err = -EEXIST;
/* normally audit_add_tree_rule() will free it on failure */ /* normally audit_add_tree_rule() will free it on failure */
if (tree) if (tree)
...@@ -1305,22 +886,16 @@ static inline int audit_add_rule(struct audit_entry *entry) ...@@ -1305,22 +886,16 @@ static inline int audit_add_rule(struct audit_entry *entry)
goto error; goto error;
} }
/* Avoid calling path_lookup under audit_filter_mutex. */
if (watch) {
err = audit_get_nd(watch->path, &ndp, &ndw);
if (err)
goto error;
}
mutex_lock(&audit_filter_mutex);
if (watch) { if (watch) {
/* audit_filter_mutex is dropped and re-taken during this call */ /* audit_filter_mutex is dropped and re-taken during this call */
err = audit_add_watch(&entry->rule, ndp, ndw); err = audit_add_watch(&entry->rule);
if (err) { if (err) {
mutex_unlock(&audit_filter_mutex); mutex_unlock(&audit_filter_mutex);
goto error; goto error;
} }
h = audit_hash_ino((u32)watch->ino); /* entry->rule.watch may have changed during audit_add_watch() */
watch = entry->rule.watch;
h = audit_hash_ino((u32)audit_watch_inode(watch));
list = &audit_inode_hash[h]; list = &audit_inode_hash[h];
} }
if (tree) { if (tree) {
...@@ -1358,11 +933,9 @@ static inline int audit_add_rule(struct audit_entry *entry) ...@@ -1358,11 +933,9 @@ static inline int audit_add_rule(struct audit_entry *entry)
#endif #endif
mutex_unlock(&audit_filter_mutex); mutex_unlock(&audit_filter_mutex);
audit_put_nd(ndp, ndw); /* NULL args OK */
return 0; return 0;
error: error:
audit_put_nd(ndp, ndw); /* NULL args OK */
if (watch) if (watch)
audit_put_watch(watch); /* tmp watch, matches initial get */ audit_put_watch(watch); /* tmp watch, matches initial get */
return err; return err;
...@@ -1372,7 +945,7 @@ static inline int audit_add_rule(struct audit_entry *entry) ...@@ -1372,7 +945,7 @@ static inline int audit_add_rule(struct audit_entry *entry)
static inline int audit_del_rule(struct audit_entry *entry) static inline int audit_del_rule(struct audit_entry *entry)
{ {
struct audit_entry *e; struct audit_entry *e;
struct audit_watch *watch, *tmp_watch = entry->rule.watch; struct audit_watch *watch = entry->rule.watch;
struct audit_tree *tree = entry->rule.tree; struct audit_tree *tree = entry->rule.tree;
struct list_head *list; struct list_head *list;
LIST_HEAD(inotify_list); LIST_HEAD(inotify_list);
...@@ -1394,29 +967,8 @@ static inline int audit_del_rule(struct audit_entry *entry) ...@@ -1394,29 +967,8 @@ static inline int audit_del_rule(struct audit_entry *entry)
goto out; goto out;
} }
watch = e->rule.watch; if (e->rule.watch)
if (watch) { audit_remove_watch_rule(&e->rule, &inotify_list);
struct audit_parent *parent = watch->parent;
list_del(&e->rule.rlist);
if (list_empty(&watch->rules)) {
audit_remove_watch(watch);
if (list_empty(&parent->watches)) {
/* Put parent on the inotify un-registration
* list. Grab a reference before releasing
* audit_filter_mutex, to be released in
* audit_inotify_unregister().
* If filesystem is going away, just leave
* the sucker alone, eviction will take
* care of it.
*/
if (pin_inotify_watch(&parent->wdata))
list_add(&parent->ilist, &inotify_list);
}
}
}
if (e->rule.tree) if (e->rule.tree)
audit_remove_tree_rule(&e->rule); audit_remove_tree_rule(&e->rule);
...@@ -1438,8 +990,8 @@ static inline int audit_del_rule(struct audit_entry *entry) ...@@ -1438,8 +990,8 @@ static inline int audit_del_rule(struct audit_entry *entry)
audit_inotify_unregister(&inotify_list); audit_inotify_unregister(&inotify_list);
out: out:
if (tmp_watch) if (watch)
audit_put_watch(tmp_watch); /* match initial get */ audit_put_watch(watch); /* match initial get */
if (tree) if (tree)
audit_put_tree(tree); /* that's the temporary one */ audit_put_tree(tree); /* that's the temporary one */
...@@ -1527,11 +1079,9 @@ static void audit_log_rule_change(uid_t loginuid, u32 sessionid, u32 sid, ...@@ -1527,11 +1079,9 @@ static void audit_log_rule_change(uid_t loginuid, u32 sessionid, u32 sid,
security_release_secctx(ctx, len); security_release_secctx(ctx, len);
} }
} }
audit_log_format(ab, " op=%s rule key=", action); audit_log_format(ab, " op=");
if (rule->filterkey) audit_log_string(ab, action);
audit_log_untrustedstring(ab, rule->filterkey); audit_log_key(ab, rule->filterkey);
else
audit_log_format(ab, "(null)");
audit_log_format(ab, " list=%d res=%d", rule->listnr, res); audit_log_format(ab, " list=%d res=%d", rule->listnr, res);
audit_log_end(ab); audit_log_end(ab);
} }
...@@ -1595,7 +1145,7 @@ int audit_receive_filter(int type, int pid, int uid, int seq, void *data, ...@@ -1595,7 +1145,7 @@ int audit_receive_filter(int type, int pid, int uid, int seq, void *data,
return PTR_ERR(entry); return PTR_ERR(entry);
err = audit_add_rule(entry); err = audit_add_rule(entry);
audit_log_rule_change(loginuid, sessionid, sid, "add", audit_log_rule_change(loginuid, sessionid, sid, "add rule",
&entry->rule, !err); &entry->rule, !err);
if (err) if (err)
...@@ -1611,7 +1161,7 @@ int audit_receive_filter(int type, int pid, int uid, int seq, void *data, ...@@ -1611,7 +1161,7 @@ int audit_receive_filter(int type, int pid, int uid, int seq, void *data,
return PTR_ERR(entry); return PTR_ERR(entry);
err = audit_del_rule(entry); err = audit_del_rule(entry);
audit_log_rule_change(loginuid, sessionid, sid, "remove", audit_log_rule_change(loginuid, sessionid, sid, "remove rule",
&entry->rule, !err); &entry->rule, !err);
audit_free_rule(entry); audit_free_rule(entry);
...@@ -1793,7 +1343,7 @@ static int update_lsm_rule(struct audit_krule *r) ...@@ -1793,7 +1343,7 @@ static int update_lsm_rule(struct audit_krule *r)
list_del(&r->list); list_del(&r->list);
} else { } else {
if (watch) { if (watch) {
list_add(&nentry->rule.rlist, &watch->rules); list_add(&nentry->rule.rlist, audit_watch_rules(watch));
list_del(&r->rlist); list_del(&r->rlist);
} else if (tree) } else if (tree)
list_replace_init(&r->rlist, &nentry->rule.rlist); list_replace_init(&r->rlist, &nentry->rule.rlist);
...@@ -1829,27 +1379,3 @@ int audit_update_lsm_rules(void) ...@@ -1829,27 +1379,3 @@ int audit_update_lsm_rules(void)
return err; return err;
} }
/* Update watch data in audit rules based on inotify events. */
void audit_handle_ievent(struct inotify_watch *i_watch, u32 wd, u32 mask,
u32 cookie, const char *dname, struct inode *inode)
{
struct audit_parent *parent;
parent = container_of(i_watch, struct audit_parent, wdata);
if (mask & (IN_CREATE|IN_MOVED_TO) && inode)
audit_update_watch(parent, dname, inode->i_sb->s_dev,
inode->i_ino, 0);
else if (mask & (IN_DELETE|IN_MOVED_FROM))
audit_update_watch(parent, dname, (dev_t)-1, (unsigned long)-1, 1);
/* inotify automatically removes the watch and sends IN_IGNORED */
else if (mask & (IN_DELETE_SELF|IN_UNMOUNT))
audit_remove_parent_watches(parent);
/* inotify does not remove the watch, so remove it manually */
else if(mask & IN_MOVE_SELF) {
audit_remove_parent_watches(parent);
inotify_remove_watch_locked(audit_ih, i_watch);
} else if (mask & IN_IGNORED)
put_inotify_watch(i_watch);
}
kernel/auditsc.c
View file @ 650a10dc
...@@ -199,6 +199,7 @@ struct audit_context { ...@@ -199,6 +199,7 @@ struct audit_context {
struct audit_tree_refs *trees, *first_trees; struct audit_tree_refs *trees, *first_trees;
int tree_count; int tree_count;
struct list_head killed_trees;
int type; int type;
union { union {
...@@ -548,9 +549,9 @@ static int audit_filter_rules(struct task_struct *tsk, ...@@ -548,9 +549,9 @@ static int audit_filter_rules(struct task_struct *tsk,
} }
break; break;
case AUDIT_WATCH: case AUDIT_WATCH:
if (name && rule->watch->ino != (unsigned long)-1) if (name && audit_watch_inode(rule->watch) != (unsigned long)-1)
result = (name->dev == rule->watch->dev && result = (name->dev == audit_watch_dev(rule->watch) &&
name->ino == rule->watch->ino); name->ino == audit_watch_inode(rule->watch));
break; break;
case AUDIT_DIR: case AUDIT_DIR:
if (ctx) if (ctx)
...@@ -853,6 +854,7 @@ static inline struct audit_context *audit_alloc_context(enum audit_state state) ...@@ -853,6 +854,7 @@ static inline struct audit_context *audit_alloc_context(enum audit_state state)
if (!(context = kmalloc(sizeof(*context), GFP_KERNEL))) if (!(context = kmalloc(sizeof(*context), GFP_KERNEL)))
return NULL; return NULL;
audit_zero_context(context, state); audit_zero_context(context, state);
INIT_LIST_HEAD(&context->killed_trees);
return context; return context;
} }
...@@ -1024,8 +1026,8 @@ static int audit_log_single_execve_arg(struct audit_context *context, ...@@ -1024,8 +1026,8 @@ static int audit_log_single_execve_arg(struct audit_context *context,
{ {
char arg_num_len_buf[12]; char arg_num_len_buf[12];
const char __user *tmp_p = p; const char __user *tmp_p = p;
/* how many digits are in arg_num? 3 is the length of " a=" */ /* how many digits are in arg_num? 5 is the length of ' a=""' */
size_t arg_num_len = snprintf(arg_num_len_buf, 12, "%d", arg_num) + 3; size_t arg_num_len = snprintf(arg_num_len_buf, 12, "%d", arg_num) + 5;
size_t len, len_left, to_send; size_t len, len_left, to_send;
size_t max_execve_audit_len = MAX_EXECVE_AUDIT_LEN; size_t max_execve_audit_len = MAX_EXECVE_AUDIT_LEN;
unsigned int i, has_cntl = 0, too_long = 0; unsigned int i, has_cntl = 0, too_long = 0;
...@@ -1137,7 +1139,7 @@ static int audit_log_single_execve_arg(struct audit_context *context, ...@@ -1137,7 +1139,7 @@ static int audit_log_single_execve_arg(struct audit_context *context,
if (has_cntl) if (has_cntl)
audit_log_n_hex(*ab, buf, to_send); audit_log_n_hex(*ab, buf, to_send);
else else
audit_log_format(*ab, "\"%s\"", buf); audit_log_string(*ab, buf);
p += to_send; p += to_send;
len_left -= to_send; len_left -= to_send;
...@@ -1372,11 +1374,7 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts ...@@ -1372,11 +1374,7 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
audit_log_task_info(ab, tsk); audit_log_task_info(ab, tsk);
if (context->filterkey) { audit_log_key(ab, context->filterkey);
audit_log_format(ab, " key=");
audit_log_untrustedstring(ab, context->filterkey);
} else
audit_log_format(ab, " key=(null)");
audit_log_end(ab); audit_log_end(ab);
for (aux = context->aux; aux; aux = aux->next) { for (aux = context->aux; aux; aux = aux->next) {
...@@ -1549,6 +1547,8 @@ void audit_free(struct task_struct *tsk) ...@@ -1549,6 +1547,8 @@ void audit_free(struct task_struct *tsk)
/* that can happen only if we are called from do_exit() */ /* that can happen only if we are called from do_exit() */
if (context->in_syscall && context->current_state == AUDIT_RECORD_CONTEXT) if (context->in_syscall && context->current_state == AUDIT_RECORD_CONTEXT)
audit_log_exit(context, tsk); audit_log_exit(context, tsk);
if (!list_empty(&context->killed_trees))
audit_kill_trees(&context->killed_trees);
audit_free_context(context); audit_free_context(context);
} }
...@@ -1692,6 +1692,9 @@ void audit_syscall_exit(int valid, long return_code) ...@@ -1692,6 +1692,9 @@ void audit_syscall_exit(int valid, long return_code)
context->in_syscall = 0; context->in_syscall = 0;
context->prio = context->state == AUDIT_RECORD_CONTEXT ? ~0ULL : 0; context->prio = context->state == AUDIT_RECORD_CONTEXT ? ~0ULL : 0;
if (!list_empty(&context->killed_trees))
audit_kill_trees(&context->killed_trees);
if (context->previous) { if (context->previous) {
struct audit_context *new_context = context->previous; struct audit_context *new_context = context->previous;
context->previous = NULL; context->previous = NULL;
...@@ -2525,3 +2528,11 @@ void audit_core_dumps(long signr) ...@@ -2525,3 +2528,11 @@ void audit_core_dumps(long signr)
audit_log_format(ab, " sig=%ld", signr); audit_log_format(ab, " sig=%ld", signr);
audit_log_end(ab); audit_log_end(ab);
} }
struct list_head *audit_killed_trees(void)
{
struct audit_context *ctx = current->audit_context;
if (likely(!ctx || !ctx->in_syscall))
return NULL;
return &ctx->killed_trees;
}
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