Bug#462112: [ths@networkno.de: Re: Tester with IP27/IP30 needed]
Martin Michlmayr wrote:
> FYI; read the section about MIPS I.
Should be known already, for Debian this is uncritical as there is no
supported MIPS I machine left.
Thiemo
> ----- Forwarded message from Thiemo Seufer <ths@networkno.de> -----
>
> From: Thiemo Seufer <ths@networkno.de>
> Subject: Re: Tester with IP27/IP30 needed
> Date: Tue, 5 Feb 2008 12:22:11 +0000
> To: Kumba <kumba@gentoo.org>
> Cc: Florian Lohoff <flo@rfc822.org>, Ralf Baechle <ralf@linux-mips.org>,
> Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
> linux-mips@linux-mips.org, debian-mips@lists.debian.org
> User-Agent: Mutt/1.5.17+20080114 (2008-01-14)
>
> Kumba wrote:
> > 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?
>
> glibc for mips has currently no such mechanism. Note that this change
> breaks MIPS I CPUs, so it is not generally applicable.
>
> > And any idea if uClibc will need similar mods?
>
> It needs a similiar change to support R10000 v2.5.
>
>
> Thiemo
>
> ----- End forwarded message -----
>
> --
> Martin Michlmayr
> http://www.cyrius.com/
>
>
>
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