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 5e786a84a4ecf4ddb578c7b7a65a94c90308a3e0..fe97fcb751a79f13e7a02d9974176e95e345ec31 100644 (file)
--- 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 */