linux-kernel - [PATCH] Fix copy_user on x86

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Message-ID: <m3myl9hf0o.fsf@gravicappa.englab.brq.redhat.com>
Date:	Wed, 25 Jun 2008 14:31:51 +0200
From:	Vitaly Mayatskikh <v.mayatskih@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: [PATCH] Fix copy_user on x86_64

Bug in copy_user can be used from userspace on RHEL-4 and other
distributions with similar kernel base (CVE-2008-0598). Patch with fixed
copy_user attached, it falls into byte copy loop on faults and returns
correct count for uncopied bytes. Patch also fixes incorrect passing of
zero flag in copy_to_user (%eax was used instead of %ecx).

Also there's script for systemtap, it tests corner cases in both
copy_user realizations (unrolled and string).

View attachment "copy_user.patch" of type "text/plain" (9097 bytes)

View attachment "copy.gen" of type "text/plain" (7260 bytes)

View attachment "Makefile" of type "text/plain" (560 bytes)

-- 
wbr, Vitaly