linux-kernel - Re: [PATCH] signal: break out of wait loops on kthread

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]

Date:   Mon, 27 Jun 2022 16:54:54 +0200
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     linux-kernel@...r.kernel.org, mingo@...hat.com,
        ebiederm@...ssion.com,
        Toke Høiland-Jørgensen <toke@...hat.com>,
        Kalle Valo <kvalo@...nel.org>,
        Johannes Berg <johannes@...solutions.net>
Subject: Re: [PATCH] signal: break out of wait loops on kthread_stop()

On Mon, Jun 27, 2022 at 03:27:03PM +0200, Peter Zijlstra wrote:
> On Mon, Jun 27, 2022 at 02:00:20PM +0200, Jason A. Donenfeld wrote:
> 
> > +bool __kthread_should_stop(struct task_struct *k)
> > +{
> > +	return (k->flags & PF_KTHREAD) &&
> > +	       test_bit(KTHREAD_SHOULD_STOP, &to_kthread(k)->flags);
> > +}
> 
> This used to be a racy pattern; not sure it still is since Eric poked at
> this last, but please use __to_kthread() instead.

Ah, indeed. Will send a v2.

Jason