linux-kernel - [PATCH 0/2] revert changes to zcache_do

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Date:	Thu, 23 Aug 2012 10:33:09 -0500
From:	Seth Jennings <sjenning@...ux.vnet.ibm.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Seth Jennings <sjenning@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Nitin Gupta <ngupta@...are.org>,
	Minchan Kim <minchan@...nel.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Dan Magenheimer <dan.magenheimer@...cle.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	devel@...verdev.osuosl.org
Subject: [PATCH 0/2] revert changes to zcache_do_preload()

This patchset fixes a regression in 3.6 by reverting two dependent
commits that made changes to zcache_do_preload().

The commits undermine an assumption made by tmem_put() in
the cleancache path that preemption is disabled.  This change
introduces a race condition that can result in the wrong page
being returned by tmem_get(), causing assorted errors (segfaults,
apparent file corruption, etc) in userspace.

The corruption was discussed in this thread:
https://lkml.org/lkml/2012/8/17/494

Please apply this patchset to 3.6.  This problem didn't exist
in previous releases so nothing need be done for the stable trees.

Seth Jennings (2):
  Revert "staging: zcache: cleanup zcache_do_preload and
    zcache_put_page"
  Revert "staging: zcache: optimize zcache_do_preload"

 drivers/staging/zcache/zcache-main.c |   54 +++++++++++++++++++---------------
 1 file changed, 31 insertions(+), 23 deletions(-)

-- 
1.7.9.5

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