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Date: Wed, 25 May 2011 17:49:24 -0400
Message-ID: <BANLkTim-Cwo_PNO-9VeidaeQzdGpurQdJQ@mail.gmail.com>
From: Arnaud Lacombe <lacombar@gmail.com>
To: John Baldwin <jhb@freebsd.org>
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Cc: freebsd-current@freebsd.org, Dimitry Andric <dim@freebsd.org>
Subject: Re: [PATCH] Fix CFLAGS overwrite by Makefile
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Hi,

On Wed, May 25, 2011 at 4:10 PM, Arnaud Lacombe <lacombar@gmail.com> wrote:
> I'm now trying to track down the original instruction triggering the
> SIGILL, but it is in a library and that section of the memory does not
> seem to be included in the core. Moreover I do not think I have any
> way on a broken system to get the address at which libraries get
> loaded (understand that ldd(1) is dynamically linked, and as the libc
> the likely culprit, rendering ldd(1) useless).
>
ok, the reason the whole system appears broken is because
`/libexec/ld-elf.so.1' is broken, it contains several CMOV
instructions. The objects it is made from are clear from any CMOV, so
this code likely comes from the jail's lib. I guess that the
responsible for building the jail environment had the wonderful idea
to use the host /usr/lib32 and put them in the jail /usr/lib, without
knowing that those libraries are i686-optimized, That also explain the
/boot/loader brokenness which links against the jail's libstand.a.

 - Arnaud