linux-kernel - Re: [PATCH v3 3/8] xen/events: avoid handling the same event on two cpus at the same time

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

Message-ID: <495a12e4-d54b-0841-07b2-5b0a0cea5d10@xen.org>
Date:   Sat, 20 Feb 2021 12:12:14 +0000
From:   Julien Grall <julien@....org>
To:     Juergen Gross <jgross@...e.com>, xen-devel@...ts.xenproject.org,
        linux-kernel@...r.kernel.org
Cc:     Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        stable@...r.kernel.org
Subject: Re: [PATCH v3 3/8] xen/events: avoid handling the same event on two
 cpus at the same time

Hi Juergen,

On 19/02/2021 15:40, Juergen Gross wrote:
> When changing the cpu affinity of an event it can happen today that
> (with some unlucky timing) the same event will be handled on the old
> and the new cpu at the same time.
> 
> Avoid that by adding an "event active" flag to the per-event data and
> call the handler only if this flag isn't set.
> 
> Cc: stable@...r.kernel.org
> Reported-by: Julien Grall <julien@....org>
> Signed-off-by: Juergen Gross <jgross@...e.com>

Reviewed-by: Julien Grall <jgrall@...zon.com>

Cheers,

-- 
Julien Grall