From: Vasiliy Kulikov <segoon@openwall.com>
Date: Thu, 14 Apr 2011 16:55:16 +0000 (+0400)
Subject: agp: fix arbitrary kernel memory writes
X-Git-Tag: v2.6.39-rc5~29^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=194b3da873fd334ef183806db751473512af29ce;p=pandora-kernel.git

agp: fix arbitrary kernel memory writes

pg_start is copied from userspace on AGPIOC_BIND and AGPIOC_UNBIND ioctl
cmds of agp_ioctl() and passed to agpioc_bind_wrap().  As said in the
comment, (pg_start + mem->page_count) may wrap in case of AGPIOC_BIND,
and it is not checked at all in case of AGPIOC_UNBIND.  As a result, user
with sufficient privileges (usually "video" group) may generate either
local DoS or privilege escalation.

Signed-off-by: Vasiliy Kulikov <segoon@openwall.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
---

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