From: Rainer Weikusat <rweikusat@mobileactivedefense.com>
To: Ben Hutchings <ben@decadent.org.uk>
Cc: Rainer Weikusat <rweikusat@mobileactivedefense.com>,
Philipp Hahn <pmhahn@pmhahn.de>,
Hannes Frederic Sowa <hannes@stressinduktion.org>,
Sasha Levin <sasha.levin@oracle.com>,
"David S. Miller" <davem@davemloft.net>,
linux-kernel@vger.kernel.org, Karolin Seeger <kseeger@samba.org>,
Jason Baron <jbaron@akamai.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Arvid Requate <requate@univention.de>,
Stefan Gohmann <gohmann@univention.de>
Subject: Re: Bug 4.1.16: self-detected stall in net/unix/?
Date: Thu, 11 Feb 2016 17:54:28 +0000 [thread overview]
Message-ID: <87mvr7jfor.fsf@doppelsaurus.mobileactivedefense.com> (raw)
In-Reply-To: <87r3gjjgbu.fsf@doppelsaurus.mobileactivedefense.com> (Rainer Weikusat's message of "Thu, 11 Feb 2016 17:40:37 +0000")
Rainer Weikusat <rw@doppelsaurus.mobileactivedefense.com> writes:
[...]
> This means it only gets locked if unix_peer(other) != sk and this cannot
> happen if other == sk and unix_peer(sk) == other, however, the 2nd
> condition isn't guaranteed: other might indeed be == sk and not the peer
> of it because someone could be using _sendmsg to send a message via a
> socket to an address bound to the same socket. In this case, other was
> found via
A second way to hits this (probably somewhat difficult to trigger in
practice): sk happened to be connected to itself by the time the
unix_peer_get(sk) was executed but was disconnected before the
unix_state_lock(other) below.
next prev parent reply other threads:[~2016-02-11 17:55 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-02 16:25 Bug 4.1.16: self-detected stall in net/unix/? Philipp Hahn
2016-02-03 1:43 ` Hannes Frederic Sowa
2016-02-05 15:28 ` Philipp Hahn
2016-02-11 13:47 ` Philipp Hahn
2016-02-11 15:55 ` Rainer Weikusat
2016-02-11 17:03 ` Ben Hutchings
2016-02-11 17:40 ` Rainer Weikusat
2016-02-11 17:54 ` Rainer Weikusat [this message]
2016-02-11 18:31 ` Rainer Weikusat
2016-02-11 19:37 ` [PATCH net] af_unix: Guard against other == sk in unix_dgram_sendmsg Rainer Weikusat
2016-02-12 9:19 ` Philipp Hahn
2016-02-12 13:25 ` Rainer Weikusat
2016-02-12 19:54 ` Ben Hutchings
2016-02-12 20:17 ` Rainer Weikusat
2016-02-12 20:47 ` Ben Hutchings
2016-02-12 20:59 ` Rainer Weikusat
2016-02-16 17:54 ` David Miller
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