From: Stanislav Brabec <sbrabec@suse.cz>
Date: Mon, 5 May 2014 18:49:49 +0000 (+0200)
Subject: hwclock: Check drift value in /etc/adjtime
X-Git-Tag: v2.25-rc1~204
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=db8fc5f37728810bdd5b865ac420c31714e35def;p=thirdparty%2Futil-linux.git

hwclock: Check drift value in /etc/adjtime

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>
---

diff --git a/sys-utils/hwclock.c b/sys-utils/hwclock.c
index 5e786a84a4..fe97fcb751 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 */