netdev - Re: [PATCH net] netfilter: on sockopt() acquire sock lock only in the required scope

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: Windows password security audit tool. GUI, reports in PDF.

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

Date:   Wed, 31 Jan 2018 16:39:32 +0100
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     Paolo Abeni <pabeni@...hat.com>
Cc:     netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        Florian Westphal <fw@...len.de>,
        netfilter-devel@...r.kernel.org
Subject: Re: [PATCH net] netfilter: on sockopt() acquire sock lock only in
 the required scope

On Tue, Jan 30, 2018 at 07:01:40PM +0100, Paolo Abeni wrote:
> Syzbot reported several deadlocks in the netfilter area caused by
> rtnl lock and socket lock being acquired with a different order on
> different code paths, leading to backtraces like the following one:
[...]
> The problem, as Florian noted, is that nf_setsockopt() is always
> called with the socket held, even if the lock itself is required only
> for very tight scopes and only for some operation.

Applied, thanks Paolo.