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timekeeping: Audit clock adjustments

Emit an audit record whenever the system clock is changed (i.e. shifted by a non-zero offset) by a syscall from userspace. The syscalls than can (at the time of writing) trigger such record are: - settimeofday(2), stime(2), clock_settime(2) -- via do_settimeofday64() - adjtimex(2), clock_adjtime(2) -- via do_adjtimex() The new records have type AUDIT_TIME_INJOFFSET and contain the following fields: - sec -- the 'seconds' part of the offset - nsec -- the 'nanoseconds' part of the offset Example record (time was shifted backwards by ~15.875 seconds): type=TIME_INJOFFSET msg=audit(1530616049.652:13): sec=-16 nsec=124887145 The records of this type will be associated with the corresponding syscall records.

Ondrej Mosnacek committed 7 years ago

Commit 2d87a061 parent 699c1864 files · +28 −0Browse files

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include/uapi/linux/audit.h+1−0
@@ -114,6 +114,7 @@ · 113 unmodified lines
114114 #define AUDIT_REPLACE 1329 /* Replace auditd if this packet unanswerd */
115115 #define AUDIT_KERN_MODULE 1330 /* Kernel Module events */
116116 #define AUDIT_FANOTIFY 1331 /* Fanotify access decision */
117+#define AUDIT_TIME_INJOFFSET 1332 /* Timekeeping offset injected */
117118
118119 #define AUDIT_AVC 1400 /* SE Linux avc denial or grant */
119120 #define AUDIT_SELINUX_ERR 1401 /* Internal SE Linux Errors */