linux-kernel - Re: File corruption when using kernels 2.6.18+

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]

Date:	Wed, 3 Oct 2007 21:30:11 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	"Pekka Enberg" <penberg@...helsinki.fi>
Cc:	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Neil Romig" <neil@...ig.demon.co.uk>,
	linux-kernel@...r.kernel.org, hyoshiok@...aclelinux.com,
	"Andrew Morton" <akpm@...ux-foundation.org>
Subject: Re: File corruption when using kernels 2.6.18+

On Wed, 3 Oct 2007 22:35:24 +0300
"Pekka Enberg" <penberg@...helsinki.fi> wrote:

> Hi Linus,
> 
> On 10/3/07, Linus Torvalds <torvalds@...ux-foundation.org> wrote:
> > I would bet that the reason the intel-optimized memcpy triggers this is
> > that the non-temporal stores just means that you go out directly on the
> > bus, and it probably just shows a weakness in the chipset or bus that
> > doesn't show with the normal cacheline accesses.
> 
> But that should show up with memtest too, no?

Not neccessarily. The old VIA memory copying bug only showed up with
prefetching and mmx store patterns. That was a hardware flaw that took
extreme memory utilisation to show up - so it does occur but thats not to
say it is the cause

Alan
-
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/