linux-kernel - Re: [PATCH, take4] FUTEX : new PRIVATE futexes

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Message-ID: <20070407111849.GT355@devserv.devel.redhat.com>
Date:	Sat, 7 Apr 2007 07:18:49 -0400
From:	Jakub Jelinek <jakub@...hat.com>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Jones <davej@...hat.com>,
	Ulrich Drepper <drepper@...il.com>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Ingo Molnar <mingo@...e.hu>, Andi Kleen <ak@...e.de>,
	Ravikiran G Thirumalai <kiran@...lex86.org>,
	"Shai Fultheim (Shai@...lex86.org)" <shai@...lex86.org>,
	pravin b shelar <pravin.shelar@...softinc.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH, take4] FUTEX : new PRIVATE futexes

On Sat, Apr 07, 2007 at 10:43:39AM +0200, Eric Dumazet wrote:
> get_futex_key() does a check against sizeof(u32) regardless of futex being 64bits or not.
> So it is possible a 64bit futex spans two pages of memory...

That would be a user bug.  32-bit futexes have to be 32-bit aligned, 64-bit
futexes have to be 64-bit aligned.

	Jakub
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