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

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Date:   Wed, 25 Aug 2021 12:33:11 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Peter Zijlstra <peterz@...radead.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: [patch 0/2] locking/rtmutex: Cure two subtle bugs

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,

	tglx
---
 rtmutex.c        |   12 +++++++++---
 rtmutex_common.h |   13 +++++++++++++
 2 files changed, 22 insertions(+), 3 deletions(-)