linux-kernel - Re: Opteron Rev E has a bug ... a locked instruction doesn't act as a read-acquire barrier (confirmed)

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] [day] [month] [year] [list]

Message-Id: <200808111903.06953.arekm@maven.pl>
Date:	Mon, 11 Aug 2008 19:03:06 +0200
From:	Arkadiusz Miskiewicz <arekm@...en.pl>
To:	Mikael Pettersson <mikpe@...uu.se>
Cc:	"Wahlig, Elsie" <elsie.wahlig@....com>,
	linux-kernel@...r.kernel.org
Subject: Re: Opteron Rev E has a bug ... a locked instruction doesn't act as a read-acquire barrier (confirmed)

On Wednesday 06 August 2008, Mikael Pettersson wrote:
> On Wed, 6 Aug 2008 19:13:34 +0200, Arkadiusz Miskiewicz wrote:
> >On Wednesday 06 August 2008, Wahlig, Elsie wrote:
> >> Your issue may be one that has been seen on 1st generation
> >> AMD Opteron processor's with cpuid family 0Fh, cpuid model's
> >> < 40h with the code sequence that performs a read-modify write
> >> operation after acquiring a semaphore.
[...]
> Also I think I'll start by writing a user-space test program that
> does a stress-test of the plain lock;rmw;unlobk sequence to see if
> it can break it. (Locks/mutexes are also used in user-space.)

Bugreported so hopefully it won't be lost.

http://bugzilla.kernel.org/show_bug.cgi?id=11305

> /Mikael

-- 
Arkadiusz Miśkiewicz        PLD/Linux Team
arekm / maven.pl            http://ftp.pld-linux.org/
--
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/