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authorDavid Woodhouse <dwmw2@shinybook.infradead.org>2005-06-22 14:56:47 +0100
committerDavid Woodhouse <dwmw2@shinybook.infradead.org>2005-06-22 14:56:47 +0100
commit4a4cd633b575609b741a1de7837223a2d9e1c34c (patch)
treef4c3a6beb6a587598193053240f3e3f82885f1e3
parentf6a789d19858a951e7ff9e297a44b377c21b6c33 (diff)
downloadop-kernel-dev-4a4cd633b575609b741a1de7837223a2d9e1c34c.zip
op-kernel-dev-4a4cd633b575609b741a1de7837223a2d9e1c34c.tar.gz
AUDIT: Optimise the audit-disabled case for discarding user messages
Also exempt USER_AVC message from being discarded to preserve existing behaviour for SE Linux. Signed-off-by: David Woodhouse <dwmw2@infradead.org>
-rw-r--r--include/linux/audit.h7
-rw-r--r--kernel/audit.c32
-rw-r--r--kernel/auditsc.c21
3 files changed, 34 insertions, 26 deletions
diff --git a/include/linux/audit.h b/include/linux/audit.h
index 5d1a9dd..77adef6 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -51,7 +51,8 @@
#define AUDIT_WATCH_LIST 1009 /* List all file/dir watches */
#define AUDIT_SIGNAL_INFO 1010 /* Get info about sender of signal to auditd */
-#define AUDIT_FIRST_USER_MSG 1100 /* Userspace messages uninteresting to kernel */
+#define AUDIT_FIRST_USER_MSG 1100 /* Userspace messages mostly uninteresting to kernel */
+#define AUDIT_USER_AVC 1107 /* We filter this differently */
#define AUDIT_LAST_USER_MSG 1199
#define AUDIT_DAEMON_START 1200 /* Daemon startup record */
@@ -235,7 +236,7 @@ extern int audit_socketcall(int nargs, unsigned long *args);
extern int audit_sockaddr(int len, void *addr);
extern int audit_avc_path(struct dentry *dentry, struct vfsmount *mnt);
extern void audit_signal_info(int sig, struct task_struct *t);
-extern int audit_filter_user(struct task_struct *tsk, int type);
+extern int audit_filter_user(int pid, int type);
#else
#define audit_alloc(t) ({ 0; })
#define audit_free(t) do { ; } while (0)
@@ -252,7 +253,7 @@ extern int audit_filter_user(struct task_struct *tsk, int type);
#define audit_sockaddr(len, addr) ({ 0; })
#define audit_avc_path(dentry, mnt) ({ 0; })
#define audit_signal_info(s,t) do { ; } while (0)
-#define audit_filter_user(struct ({ 1; })
+#define audit_filter_user(p,t) ({ 1; })
#endif
#ifdef CONFIG_AUDIT
diff --git a/kernel/audit.c b/kernel/audit.c
index c1ab8db..09a3758 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -429,25 +429,21 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
break;
case AUDIT_USER:
case AUDIT_FIRST_USER_MSG...AUDIT_LAST_USER_MSG:
- read_lock(&tasklist_lock);
- tsk = find_task_by_pid(pid);
- if (tsk)
- get_task_struct(tsk);
- read_unlock(&tasklist_lock);
- if (!tsk)
- return -ESRCH;
-
- if (audit_enabled && audit_filter_user(tsk, msg_type)) {
- ab = audit_log_start(NULL, msg_type);
- if (ab) {
- audit_log_format(ab,
- "user pid=%d uid=%u auid=%u msg='%.1024s'",
- pid, uid, loginuid, (char *)data);
- audit_set_pid(ab, pid);
- audit_log_end(ab);
- }
+ if (!audit_enabled && msg_type != AUDIT_USER_AVC)
+ return 0;
+
+ err = audit_filter_user(pid, msg_type);
+ if (err == 1) {
+ err = 0;
+ ab = audit_log_start(NULL, msg_type);
+ if (ab) {
+ audit_log_format(ab,
+ "user pid=%d uid=%u auid=%u msg='%.1024s'",
+ pid, uid, loginuid, (char *)data);
+ audit_set_pid(ab, pid);
+ audit_log_end(ab);
+ }
}
- put_task_struct(tsk);
break;
case AUDIT_ADD:
case AUDIT_DEL:
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index cb8a449..fc858b0 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -530,22 +530,33 @@ static enum audit_state audit_filter_syscall(struct task_struct *tsk,
return AUDIT_BUILD_CONTEXT;
}
-int audit_filter_user(struct task_struct *tsk, int type)
+int audit_filter_user(int pid, int type)
{
+ struct task_struct *tsk;
struct audit_entry *e;
enum audit_state state;
+ int ret = 1;
- if (audit_pid && tsk->pid == audit_pid)
- return AUDIT_DISABLED;
+ read_lock(&tasklist_lock);
+ tsk = find_task_by_pid(pid);
+ if (tsk)
+ get_task_struct(tsk);
+ read_unlock(&tasklist_lock);
+
+ if (!tsk)
+ return -ESRCH;
rcu_read_lock();
list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_USER], list) {
if (audit_filter_rules(tsk, &e->rule, NULL, &state)) {
- rcu_read_unlock();
- return state != AUDIT_DISABLED;
+ if (state == AUDIT_DISABLED)
+ ret = 0;
+ break;
}
}
rcu_read_unlock();
+ put_task_struct(tsk);
+
return 1; /* Audit by default */
}
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