linux-kernel - Re: [tip: timers/core] hrtimer: Annotate lockless access to timer->state

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: <alpine.DEB.2.21.1911062316310.1869@nanos.tec.linutronix.de>
Date:   Wed, 6 Nov 2019 23:16:51 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Eric Dumazet <edumazet@...gle.com>
cc:     LKML <linux-kernel@...r.kernel.org>,
        linux-tip-commits@...r.kernel.org,
        syzbot <syzkaller@...glegroups.com>,
        Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>
Subject: Re: [tip: timers/core] hrtimer: Annotate lockless access to
 timer->state

On Wed, 6 Nov 2019, Eric Dumazet wrote:
> > -static inline int hrtimer_is_queued(struct hrtimer *timer)
> > +static inline bool hrtimer_is_queued(struct hrtimer *timer)
> >  {
> > -       return timer->state & HRTIMER_STATE_ENQUEUED;
> > +       /* The READ_ONCE pairs with the update functions of timer->state */
> > +       return !!READ_ONCE(timer->state) & HRTIMER_STATE_ENQUEUED;
> 
> You probably meant :
> 
> return !!(READ_ONCE(timer->state) & HRTIMER_STATE_ENQUEUED);
> 
> Sorry for not spotting this earlier.

Yes, I'm a moron....