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Date: Mon, 12 May 2014 22:54:44 +0200
From: Peter Zijlstra <peterz@infradead.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: LKML <linux-kernel@vger.kernel.org>, Dave Jones <davej@redhat.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
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        Michael Kerrisk <mtk.manpages@gmail.com>,
        Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Subject: Re: [patch 3/3] futex: Prevent attaching to kernel threads
Message-ID: <20140512205444.GI13467@laptop.programming.kicks-ass.net>
References: <20140512190438.314125476@linutronix.de>
 <20140512201701.194824402@linutronix.de>
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On Mon, May 12, 2014 at 08:45:35PM -0000, Thomas Gleixner wrote:
> We happily allow userspace to declare a random kernel thread to be the
> owner of a user space PI futex.
> 
> Found while analysing the fallout of Dave Jones syscall fuzzer.

Did you also still want to check the ppid for _PRIVATE futexes?