linux-kernel - Re: [PATCH 0/3] fix reuseaddr regression

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 PHC
Open Source and information security mailing list archives

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

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

Date:   Mon, 18 Sep 2017 13:44:32 -0400
From:   Cole Robinson <crobinso@...hat.com>
To:     josef@...icpanda.com, davem@...emloft.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, labbott@...hat.com,
        kernel-team@...com
Subject: Re: [PATCH 0/3] fix reuseaddr regression

On 09/18/2017 12:28 PM, josef@...icpanda.com wrote:
> I introduced a regression when reworking the fastreuse port stuff that allows
> bind conflicts to occur once a reuseaddr socket successfully opens on an
> existing tb.  The root cause is I reversed an if statement which caused us to
> set the tb as if there were no owners on the socket if there were, which
> obviously is not correct.
> 
> Dave I have follow up patches that will add a selftest for this case and I ran
> the other reuseport related tests as well.  These need to go in pretty quickly
> as it breaks kvm, I've marked them for stable.  Sorry for the regression,
> 

To clarify, it doesn't really break KVM specifically, but it breaks a
port collision detection idiom that libvirt depends on to successfully
launch qemu/xen/... VMs in certain cases.

Thanks,
Cole