Date: Thu, 3 Sep 2009 15:11:21 -0700 From: Greg KH <greg@...ah.com> To: oss-security@...ts.openwall.com Cc: "Steven M. Christey" <coley@...us.mitre.org>, Greg KH <gregkh@...e.de> Subject: Re: CVE request: kernel: tty: make sure to flush any pending work when halting the ldisc On Mon, Aug 31, 2009 at 11:52:21AM +0800, Eugene Teo wrote: > The tty ldisc code was rewritten to use proper reference counts (commits > 65b770468e98 and cbe9352fa08f) in order to avoid a race with hangup, but > it also introduced another bug that can result in various problems such > as a NULL pointer dereference in run_timer_softirq() or a BUG() in > worker_thread. More info in the patch. > > Upstream commit: > http://git.kernel.org/linus/5c58ceff103d8a654f24769bb1baaf84a841b0cc > > Reproducer: > http://lkml.org/lkml/2009/8/20/27 > http://lkml.org/lkml/2009/8/20/68 > > Backtrace: > http://lkml.org/lkml/2009/8/20/21 > > I believe this affects kernel versions greater than v2.6.26. The code in > drivers/char/tty_ldisc.c was from drivers/char/tty_io.c before it was > splitted into its own file in v2.6.27-rc1 (commit 01e1abb2). I did not > investigate further. Are you sure about this? It only looks to be a problem in the 2.6.31-rc tree, as both of the above referenced patches are in that tree (showed up in 2.6.31-rc6). Do you have a backported patch to 2.6.30 that you think fixes the problem? thanks, greg k-h
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