linux-kernel - Re: [patch 0/2] locking/rtmutex: Cure two subtle bugs

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:   Wed, 25 Aug 2021 13:40:24 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Waiman Long <longman@...hat.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Davidlohr Bueso <dave@...olabs.net>
Subject: Re: [patch 0/2] locking/rtmutex: Cure two subtle bugs

On Wed, Aug 25, 2021 at 12:33:11PM +0200, Thomas Gleixner wrote:
> The recent updates to rtmutex introduced two subtle bugs:
> 
>   1) The spinwait mechanism added a UAF which triggers a BUG_ON()
> 
>   2) The ww_mutex addition leaves a waiter queued in the error exit path
>      resulting in rb tree corruption
> 
> The fixes are straight forward, but the rtmutex based ww_mutex
> implementation still has some more rough egdes which need to be ironed out.

Thanks!