* [2.6.16/18 patch] security/seclvl.c: fix time wrap (CVE-2005-4352)
@ 2006-11-15 16:01 Adrian Bunk
0 siblings, 0 replies; only message in thread
From: Adrian Bunk @ 2006-11-15 16:01 UTC (permalink / raw)
To: Chris Wright, Michael Halcrow; +Cc: linux-kernel, stable
initlvl=2 in seclvl gives the guarantee
"Cannot decrement the system time".
But it was possible to set the time to the maximum unixtime value
(19 Jan 2038) resulting in a wrap to the minimum value.
This patch fixes this by disallowing setting the time to any date
after 2031 with initlvl=2.
This patch does not apply to kernel 2.6.19 since the seclvl module was
already removed in this kernel.
Signed-off-by: Adrian Bunk <bunk@stusta.de>
--- linux-2.6.16.32/security/seclvl.c.old 2006-11-15 13:58:05.000000000 +0100
+++ linux-2.6.16.32/security/seclvl.c 2006-11-15 16:41:51.000000000 +0100
@@ -381,6 +381,8 @@ static int seclvl_settime(struct timespe
current->group_leader->pid);
return -EPERM;
} /* if attempt to decrement time */
+ if (tv->tv_sec > 1924988400) /* disallow dates after 2030) */
+ return -EPERM; /* CVE-2005-4352 */
} /* if seclvl > 1 */
return 0;
}
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2006-11-15 16:01 [2.6.16/18 patch] security/seclvl.c: fix time wrap (CVE-2005-4352) Adrian Bunk
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