[PATCH 2/2] hwclock: Check drift value in /etc/adjtime

[PATCH 2/2] hwclock: Check drift value in /etc/adjtime

[Stanislav Brabec]

Due to bug in older versions of hwclock, /etc/adjtime can contain
excessive drift value (up to many years per day). Prevent it
from applying.

Signed-off-by: Stanislav Brabec <sbrabec@suse.cz>
---
 sys-utils/hwclock.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sys-utils/hwclock.c b/sys-utils/hwclock.c
index 5e786a8..fe97fcb 100644
--- a/sys-utils/hwclock.c
+++ b/sys-utils/hwclock.c
@@ -1211,6 +1211,10 @@ do_adjustment(struct adjtime *adjtime_p,
 			printf(_
 			       ("Not setting clock because last adjustment time is zero, "
 				"so history is bad."));
+	} else if (abs(adjtime_p->drift_factor) > MAX_DRIFT) {
+		if (debug)
+		printf(_("Not setting clock because drift factor %f is far too high.\n"),
+		       adjtime_p->drift_factor);
 	} else {
 		int adjustment;
 		/* Number of seconds we must insert in the Hardware Clock */
-- 
1.8.4.5

-- 
Best Regards / S pozdravem,

Stanislav Brabec
software developer
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