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  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Date:   Thu, 8 Oct 2020 17:28:23 -0700
From:   Jakub Kicinski <>
To:     Paolo Abeni <>
Cc:, "David S. Miller" <>,
Subject: Re: [PATCH net-next] mptcp: fix infinite loop on recvmsg()/worker()

On Tue,  6 Oct 2020 08:27:34 +0200 Paolo Abeni wrote:
> If recvmsg() and the workqueue race to dequeue the data
> pending on some subflow, the current mapping for such
> subflow covers several skbs and some of them have not
> reached yet the received, either the worker or recvmsg()
> can find a subflow with the data_avail flag set - since
> the current mapping is valid and in sequence - but no
> skbs in the receive queue - since the other entity just
> processed them.
> The above will lead to an unbounded loop in __mptcp_move_skbs()
> and a subsequent hang of any task trying to acquiring the msk
> socket lock.
> This change addresses the issue stopping the __mptcp_move_skbs()
> loop as soon as we detect the above race (empty receive queue
> with data_avail set).

Applied, thanks!

Powered by blists - more mailing lists