linux-kernel - Re: [PATCH v4] stop_machine: Disable preemption after queueing stopper threads

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: <20180717183450.GL2494@hirez.programming.kicks-ass.net>
Date:   Tue, 17 Jul 2018 20:34:50 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     "Isaac J. Manjarres" <isaacm@...eaurora.org>
Cc:     matt@...eblueprint.co.uk, mingo@...nel.org, tglx@...utronix.de,
        bigeasy@...utronix.de, linux-kernel@...r.kernel.org,
        psodagud@...eaurora.org, gregkh@...uxfoundation.org,
        pkondeti@...eaurora.org, stable@...r.kernel.org
Subject: Re: [PATCH v4] stop_machine: Disable preemption after queueing
 stopper threads

On Tue, Jul 17, 2018 at 09:30:17AM -0700, Isaac J. Manjarres wrote:
> After cpu_stop_queue_two_works() queues the cpu_stop works
> for the stopper threads, it releases the locks held for
> both threads, which enables preemption, which allows the
> following race condition to occur:


Does not apply because an earlier version is already applied.

https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/kernel/stop_machine.c?id=9fb8d5dc4b649dd190e1af4ead670753e71bf907

if there still is a problem, please send a new patch that describes the
remaining problem.