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Date: Mon, 15 Jul 2013 22:38:55 -0600
From: Kurt Seifried <kseifried@...hat.com>
To: oss-security@...ts.openwall.com
Subject: Re: CVE Request -- Linux kernel: bridge: BUG at kernel/timer.c:729

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On 07/15/2013 03:12 PM, Petr Matousek wrote:
> Several people reported the oops: "kernel BUG at
> kernel/timer.c:729!" and the stack trace is:
> 
> #7 [ffff880214d25c10] mod_timer+501 at ffffffff8106d905 #8
> [ffff880214d25c50] br_multicast_del_pg.isra.20+261 at 
> ffffffffa0731d25 [bridge] #9 [ffff880214d25c80]
> br_multicast_disable_port+88 at ffffffffa0732948 [bridge] #10
> [ffff880214d25cb0] br_stp_disable_port+154 at ffffffffa072bcca 
> [bridge] #11 [ffff880214d25ce8] br_device_event+520 at
> ffffffffa072a4e8 [bridge] #12 [ffff880214d25d18]
> notifier_call_chain+76 at ffffffff8164aafc #13 [ffff880214d25d50]
> raw_notifier_call_chain+22 at ffffffff810858f6 #14
> [ffff880214d25d60] call_netdevice_notifiers+45 at ffffffff81536aad 
> #15 [ffff880214d25d80] dev_close_many+183 at ffffffff81536d17 #16
> [ffff880214d25dc0] rollback_registered_many+168 at 
> ffffffff81537f68 #17 [ffff880214d25de8] rollback_registered+49 at
> ffffffff81538101 #18 [ffff880214d25e10]
> unregister_netdevice_queue+72 at ffffffff815390d8 #19
> [ffff880214d25e30] __tun_detach+272 at ffffffffa074c2f0 [tun] #20
> [ffff880214d25e88] tun_chr_close+45 at ffffffffa074c4bd [tun] #21
> [ffff880214d25ea8] __fput+225 at ffffffff8119b1f1 #22
> [ffff880214d25ef0] ____fput+14 at ffffffff8119b3fe #23
> [ffff880214d25f00] task_work_run+159 at ffffffff8107cf7f #24
> [ffff880214d25f30] do_notify_resume+97 at ffffffff810139e1 #25
> [ffff880214d25f50] int_signal+18 at ffffffff8164f292
> 
> The bug was usually hit when shutting down a KVM guest.
> 
> Upstream fix: 
> http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c7e8e8a8f7a70b343ca1e0f90a31e35ab2d16de1
>
>  Introduced by: 
> http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=9f00b2e7cf241fa389733d41b6
>
>  Introduced in upstream version: v3.11-rc1 (but we had it in Fedora
> because of bz#880035)
> 
> References: https://bugzilla.redhat.com/show_bug.cgi?id=984743 
> https://bugzilla.redhat.com/show_bug.cgi?id=980254 
> http://pkgs.fedoraproject.org/cgit/kernel.git/commit/?h=f19&id=a993279a9bb538ae524fca69ec23c5c1b428f47e
>
> 
Please use CVE-2013-4129 for this issue.

- -- 
Kurt Seifried Red Hat Security Response Team (SRT)
PGP: 0x5E267993 A90B F995 7350 148F 66BF 7554 160D 4553 5E26 7993
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