Date: Fri, 04 Sep 2009 07:58:56 +0800 From: Eugene Teo <eugeneteo@...nel.sg> 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 Greg KH wrote: > 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). Right, so this was introduced between v2.6.31-rc1 and v2.6.31-rc4, with commit c65c9bc3 and c8d50041. Thanks for clarifying. > Do you have a backported patch to 2.6.30 that you think fixes the > problem? No, I did not investigate further. Thanks, Eugene
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