netdev - Re: [PATCH net] tcp: fix various issues for sockets morphing to listen state

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-Id: <20170307.135920.663771797825250884.davem@davemloft.net>
Date:   Tue, 07 Mar 2017 13:59:20 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     eric.dumazet@...il.com
Cc:     edumazet@...gle.com, dvyukov@...gle.com, netdev@...r.kernel.org
Subject: Re: [PATCH net] tcp: fix various issues for sockets morphing to
 listen state

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Fri, 03 Mar 2017 14:08:21 -0800

> From: Eric Dumazet <edumazet@...gle.com>
> 
> Dmitry Vyukov reported a divide by 0 triggered by syzkaller, exploiting
> tcp_disconnect() path that was never really considered and/or used
> before syzkaller ;)
> 
> I was not able to reproduce the bug, but it seems issues here are the
> three possible actions that assumed they would never trigger on a
> listener.
> 
> 1) tcp_write_timer_handler
> 2) tcp_delack_timer_handler
> 3) MTU reduction
> 
> Only IPv6 MTU reduction was properly testing TCP_CLOSE and TCP_LISTEN
>  states from tcp_v6_mtu_reduced()
> 
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Reported-by: Dmitry Vyukov <dvyukov@...gle.com>

Applied and queued up for -stable.