From: Keir Fraser <keir@xen.org>
Date: Thu, 25 Nov 2010 06:08:20 +0000 (-0800)
Subject: blkback: Fix CVE-2010-3699
X-Git-Tag: v3.0-rc1~162^2~16^2~56
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=313d7b003ceceb797e8c0d18ab085ed0638b4aff;p=pandora-kernel.git

blkback: Fix CVE-2010-3699

A guest can cause the backend driver to leak a kernel thread. Such
leaked threads hold references to the device, whichmakes the device
impossible to tear down. If shut down, the guest remains a zombie
domain, the xenwatch process hangs, and most xm commands will stop
working.

This patch tries to do the following for blkback:
    - identify/extract idempotent teardown operations,
    - add/move the invocation of said teardown operation
      right before we're about to allocate new resources in the
      Connected states.

[ linux-2.6.18-xen.hg 59f097ef181b ]

Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Keir Fraser <keir@xen.org>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
---

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