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From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@kernel.org>,
	Steven Rostedt <rostedt@goodmis.org>,
	Waiman Long <longman@redhat.com>,
	Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
	Davidlohr Bueso <dave@stgolabs.net>
Subject: [patch 0/2] locking/rtmutex: Cure two subtle bugs
Date: Wed, 25 Aug 2021 12:33:11 +0200 (CEST)	[thread overview]
Message-ID: <20210825101857.420032248@linutronix.de> (raw)

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(-)

             reply	other threads:[~2021-08-25 10:33 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-25 10:33 Thomas Gleixner [this message]
2021-08-25 10:33 ` [patch 1/2] locking/rtmutex: Dont dereference waiter lockless Thomas Gleixner
2021-08-25 14:17   ` [tip: locking/core] " tip-bot2 for Thomas Gleixner
2021-08-25 10:33 ` [patch 2/2] locking/rtmutex: Dequeue waiter on ww_mutex deadlock Thomas Gleixner
2021-08-25 14:17   ` [tip: locking/core] " tip-bot2 for Thomas Gleixner
2021-08-25 11:40 ` [patch 0/2] locking/rtmutex: Cure two subtle bugs Peter Zijlstra
2021-08-26 13:26 ` Peter Zijlstra
2021-08-27  7:56   ` Sebastian Andrzej Siewior
2021-08-27 12:31   ` [tip: locking/core] locking/rtmutex: Return success on deadlock for ww_mutex waiters tip-bot2 for Peter Zijlstra
2021-08-27 12:31   ` [tip: locking/core] locking/rtmutex: Prevent spurious EDEADLK return caused by ww_mutexes tip-bot2 for Peter Zijlstra

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