linux-kernel - [patch] adjtimex() modes argument checking

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <485E005F.5000903@gmail.com>
Date:	Sun, 22 Jun 2008 09:33:51 +0200
From:	Michael Kerrisk <mtk.manpages@...il.com>
To:	Roman Zippel <zippel@...ux-m68k.org>
CC:	lkml <linux-kernel@...r.kernel.org>,
	john stultz <johnstul@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>
Subject: [patch] adjtimex() modes argument checking

Hi Roman,

I see you added a number of new modes to adtimex() in 2.6.26-rc.
Since these are userspace-visible changes, please CC me, so
that they stand a chance of getting documented in man-pages.
(I discovered these changes only by accident.)

I also have some changes to suggest for argument checking, which,
if I understand the code correctly, prevent obvious screw-ups by
callers of adjtimex().  What do you think of the patch below?

Cheers,

Michael

--- linux-2.6.26-rc6/kernel/time/ntp.c        2008-06-22 09:05:05.000000000 +0200
+++ linux-2.6.26-rc6-p/kernel/time/ntp.c       2008-06-22 09:04:31.000000000 +0200
@@ -292,6 +292,16 @@
                         return -EINVAL;
         }

+       /* These modes are the converse of one another  */
+
+       if ((txc->modes & ADJ_MICRO) && (txc->modes & ADJ_NANO))
+               return -EINVAL;
+
+       /* Both of the following want to use txc->constant */
+
+       if ((txc->modes & ADJ_TIMECONST) && (txc->modes & ADJ_TAI))
+               return -EINVAL;
+
         /* if the quartz is off by more than 10% something is VERY wrong ! */
         if (txc->modes & ADJ_TICK)
                 if (txc->tick <  900000/USER_HZ ||


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/