[RFC PATCH ghak10 v2 3/4] timekeeping: Audit attempts to adjust the clock
(Intentionally not sending to the timekeeping maintainers just yet,
let's settle on the record contents/format first.)
Signed-off-by: Ondrej Mosnacek <omosnace(a)redhat.com>
---
kernel/time/timekeeping.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 4786df904c22..02097a7d225e 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -25,6 +25,7 @@
#include <linux/stop_machine.h>
#include <linux/pvclock_gtod.h>
#include <linux/compiler.h>
+#include <linux/audit.h>
#include "tick-internal.h"
#include "ntp_internal.h"
@@ -2315,6 +2316,16 @@ int do_adjtimex(struct timex *txc)
raw_spin_lock_irqsave(&timekeeper_lock, flags);
write_seqcount_begin(&tk_core.seq);
+ /* Only log audit event if the clock was changed/attempted to be changed.
+ * Based on the logic inside timekeeping_validate_timex().
+ * NOTE: We need to log the event before any of the fields get
+ * overwritten by the output values (__do_adjtimex() does not fail, so
+ * it is OK to do it here). */
+ if ( ( (txc->modes & ADJ_ADJTIME) && !(txc->modes &
ADJ_OFFSET_READONLY))
+ || (!(txc->modes & ADJ_ADJTIME) && txc->modes)
+ || (txc->modes & ADJ_SETOFFSET))
+ audit_adjtime(txc);
+
orig_tai = tai = tk->tai_offset;
ret = __do_adjtimex(txc, &ts, &tai);
--
2.17.1