linux-kernel - Re: [PATCH 1/6] UML - Deal with host time going backwards

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

Message-Id: <200806031543.56864.dhazelton@enter.net>
Date:	Tue, 3 Jun 2008 15:43:56 -0400
From:	Daniel Hazelton <dhazelton@...er.net>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Jeff Dike <jdike@...toit.com>, akpm@...uxfoundation.org,
	linux-kernel@...r.kernel.org,
	user-mode-linux-devel@...ts.sourceforge.net, nix@...eri.org.uk
Subject: Re: [PATCH 1/6] UML - Deal with host time going backwards

On Tuesday 03 June 2008 03:32:11 pm Andrew Morton wrote:
> On Tue, 3 Jun 2008 15:02:35 -0400
>
> Jeff Dike <jdike@...toit.com> wrote:
> > Protection against the host's time going backwards - keep track of the
> > time at the last tick and if it's greater than the current time, keep
> > time stopped until the host catches up.
>
> Strange.  What would cause the host's time (or at least UML's perception
> of it) to go backwards?

A wild guess would be that the UML process is running "fast" at some point and 
its expectation of the host's time is skewed forward because of that.

Another possibility is that the hosts clock got reset between the times UML 
has checked it and the correction was a negative one.

DRH

-- 
Dialup is like pissing through a pipette. Slow and excruciatingly painful.
--
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/