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Re: Tester with IP27/IP30 needed

To: Florian Lohoff <flo@rfc822.org>
Subject: Re: Tester with IP27/IP30 needed
From: Kumba <kumba@gentoo.org>
Date: Tue, 05 Feb 2008 02:11:06 -0500
Cc: Ralf Baechle <ralf@linux-mips.org>, Thomas Bogendoerfer <tsbogend@alpha.franken.de>, linux-mips@linux-mips.org, debian-mips@lists.debian.org
In-reply-to: <20080203062711.GA28394@paradigm.rfc822.org>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <20080115112420.GA7347@alpha.franken.de> <20080115112719.GB7920@paradigm.rfc822.org> <20080117004054.GA12051@alpha.franken.de> <479609A6.2020204@gentoo.org> <20080122154958.GA29108@linux-mips.org> <479AA532.5040603@gentoo.org> <20080126143949.GA6579@alpha.franken.de> <47A4E9DF.5070603@gentoo.org> <20080203021647.GA15910@linux-mips.org> <20080203062711.GA28394@paradigm.rfc822.org>
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Florian Lohoff wrote:
On Sun, Feb 03, 2008 at 03:16:48AM +0100, Ralf Baechle wrote:
On Sat, Feb 02, 2008 at 05:08:31PM -0500, Kumba wrote:

Thomas Bogendoerfer wrote:
no suprise here. As Ralf already noted cache barrier is a restricted
instruction, it will always cause a illegal instruction when used
in user space. Nevertheless it looks like all IP28 are affected
by the simple exploit. Flo built glibc 2.7 with LLSC war workaround
and this avoids triggering the hang.
Ah, didn't know the 'cache' instructions was kernel-mode only. Explains why it survived then :)

How does one enable the LLSC war workaround in glibc?
By modifying the code ;-)

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=462112

Flo

Interesting. Is there a reason the kernel uses an #ifdef to choose between 'bezq' and 'bezql' that's not needed in glibc itself? Or does glibc itself lack a mechanism to detect CPU types to single out this specific change?

And any idea if uClibc will need similar mods?


Thanks!,

--Kumba

--
Gentoo/MIPS Team Lead

"Such is oft the course of deeds that move the wheels of the world: small hands do them because they must, while the eyes of the great are elsewhere." --Elrond

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