[PATCH V4] audit: add feature audit_lost reset
Add a method to reset the audit_lost value.
An AUDIT_SET message with the AUDIT_STATUS_LOST flag set by itself
will return a positive value repesenting the current audit_lost value
and reset the counter to zero. If AUDIT_STATUS_LOST is not the
only flag set, the reset command will be ignored. The value sent with
the command is ignored. The return value will be the +ve lost value at
reset time.
An AUDIT_CONFIG_CHANGE message will be queued to the listening audit
daemon. The message will be a standard CONFIG_CHANGE message with the
fields "lost=0" and "old=" with the latter containing the value of
audit_lost at reset time.
See: https://github.com/linux-audit/audit-kernel/issues/3
Signed-off-by: Richard Guy Briggs <rgb(a)redhat.com>
---
There is a merge conflict anticipated with the exclude filter
FEATURE_BITMAP patch (ghak5)
v2:
Switch from AUDIT_GET to AUDIT_SET
Remove AUDIT_FEATURE and AUDIT_FEATURE_BITMAP
Return +ve lost value, reply AUDIT_LOST_RESET msg to sender
v3:
Switch, from reply to sender, to queue to audit log
v4:
Switch from LOST_RESET to CONFIG_CHANGE log msg
Re-add AUDIT_FEATURE_BITMASK
---
---
include/uapi/linux/audit.h | 6 +++++-
kernel/audit.c | 8 +++++++-
2 files changed, 12 insertions(+), 2 deletions(-)
diff --git a/include/uapi/linux/audit.h b/include/uapi/linux/audit.h
index c8dc97b..3f24110 100644
--- a/include/uapi/linux/audit.h
+++ b/include/uapi/linux/audit.h
@@ -326,15 +326,19 @@ enum {
#define AUDIT_STATUS_RATE_LIMIT 0x0008
#define AUDIT_STATUS_BACKLOG_LIMIT 0x0010
#define AUDIT_STATUS_BACKLOG_WAIT_TIME 0x0020
+#define AUDIT_STATUS_LOST 0x0040
#define AUDIT_FEATURE_BITMAP_BACKLOG_LIMIT 0x00000001
#define AUDIT_FEATURE_BITMAP_BACKLOG_WAIT_TIME 0x00000002
#define AUDIT_FEATURE_BITMAP_EXECUTABLE_PATH 0x00000004
#define AUDIT_FEATURE_BITMAP_SESSIONID_FILTER 0x00000010
+#define AUDIT_FEATURE_BITMAP_LOST_RESET 0x00000020
+
#define AUDIT_FEATURE_BITMAP_ALL (AUDIT_FEATURE_BITMAP_BACKLOG_LIMIT | \
AUDIT_FEATURE_BITMAP_BACKLOG_WAIT_TIME | \
AUDIT_FEATURE_BITMAP_EXECUTABLE_PATH | \
- AUDIT_FEATURE_BITMAP_SESSIONID_FILTER)
+ AUDIT_FEATURE_BITMAP_SESSIONID_FILTER | \
+ AUDIT_FEATURE_BITMAP_LOST_RESET)
/* deprecated: AUDIT_VERSION_* */
#define AUDIT_VERSION_LATEST AUDIT_FEATURE_BITMAP_ALL
diff --git a/kernel/audit.c b/kernel/audit.c
index 57acf25..25dd70a 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -121,7 +121,7 @@ u32 audit_sig_sid = 0;
3) suppressed due to audit_rate_limit
4) suppressed due to audit_backlog_limit
*/
-static atomic_t audit_lost = ATOMIC_INIT(0);
+static atomic_t audit_lost = ATOMIC_INIT(0);
/* The netlink socket. */
static struct sock *audit_sock;
@@ -1052,6 +1052,12 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr
*nlh)
if (err < 0)
return err;
}
+ if (s.mask == AUDIT_STATUS_LOST) {
+ u32 lost = atomic_xchg(&audit_lost, 0);
+
+ audit_log_config_change("lost", 0, lost, 1);
+ return lost;
+ }
break;
}
case AUDIT_GET_FEATURE:
--
1.7.1