linux-kernel - Re: [RFC PATCH v2 3/3] restartable sequences: basic self-tests

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Message-ID: <20160406192534.GX3448@twins.programming.kicks-ass.net>
Date:	Wed, 6 Apr 2016 21:25:34 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:	Paul Turner <commonly@...il.com>, Andrew Hunter <ahh@...gle.com>,
	Andy Lutomirski <luto@...capital.net>,
	Andi Kleen <andi@...stfloor.org>,
	Dave Watson <davejwatson@...com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	linux-api <linux-api@...r.kernel.org>,
	linux-kernel@...r.kernel.org,
	Josh Triplett <josh@...htriplett.org>,
	Ingo Molnar <mingo@...hat.com>, Chris Lameter <cl@...ux.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [RFC PATCH v2 3/3] restartable sequences: basic self-tests

On Wed, Apr 06, 2016 at 01:39:22PM +0000, Mathieu Desnoyers wrote:
> There is still the question of use-after-free however that
> remains open. My understanding is that this lock-free list
> should be paired with either a type-safe memory allocator,
> using RCU, or a garbage collector.

Yeah, it looks that way indeed, there no sane way to fix that either,
even if you stick all this inside the rseq_start/finish thing you'll get
use-after-free, because we'll not restart until rseq_finish fails.