linux-kernel - [PATCH 0/2] blktrace: startup / shutdown race fixes

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Message-ID: <20100715171937.GA12953@hexapodia.org>
Date:	Thu, 15 Jul 2010 10:19:37 -0700
From:	Andy Isaacson <adi@...apodia.org>
To:	linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Masami Hiramatsu <mhiramat@...hat.com>
Subject: [PATCH 0/2] blktrace: startup / shutdown race fixes

I ran into the stale-block-directory problem while using blktrace,
and while chasing it noticed the open-coded cmpxchg.

The unlink-on-final-close is a longstanding bug that's triggerable
by the standard blktrace(1) utility (it races child threads against
the parent), and should go to -stable.  The cmpxchg is a startup
race that may be easy to maliciously trigger from userspace, but
is unlikely to be triggered accidentally.  (Famous last words...)

Andy Isaacson (2):
  blktrace: use cmpxchg
  blktrace: unlink blk directory on final trace close

 kernel/trace/blktrace.c |   18 +++++++++---------
 1 files changed, 9 insertions(+), 9 deletions(-)
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