From: Eric Dumazet <dada1@cosmosbay.com>
To: Jakub Jelinek <jakub@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Dave Jones <davej@redhat.com>, Ulrich Drepper <drepper@gmail.com>,
Nick Piggin <nickpiggin@yahoo.com.au>,
Ingo Molnar <mingo@elte.hu>, Andi Kleen <ak@suse.de>,
Ravikiran G Thirumalai <kiran@scalex86.org>,
"Shai Fultheim (Shai@scalex86.org)" <shai@scalex86.org>,
pravin b shelar <pravin.shelar@calsoftinc.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH, take4] FUTEX : new PRIVATE futexes
Date: Sat, 07 Apr 2007 13:54:30 +0200 [thread overview]
Message-ID: <46178676.3010704@cosmosbay.com> (raw)
In-Reply-To: <20070407111849.GT355@devserv.devel.redhat.com>
Jakub Jelinek a écrit :
> 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.
I am not sure what you want to say.
User doing sys_futex64(0x......FFC, FUTEX_WAKE_OP, ...) and crashing kernel or
corrupting data is ok because its a user bug ?
User is allowed to do anything, kernel must check and protect innocents.
next prev parent reply other threads:[~2007-04-07 11:55 UTC|newest]
Thread overview: 78+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-08 7:07 [RFC] NUMA futex hashing Ravikiran G Thirumalai
2006-08-08 9:14 ` Eric Dumazet
2006-08-08 20:31 ` Ravikiran G Thirumalai
2006-08-08 9:37 ` Jes Sorensen
2006-08-08 9:58 ` Andi Kleen
2006-08-08 10:07 ` Jes Sorensen
2006-08-08 9:57 ` Andi Kleen
2006-08-08 10:10 ` Eric Dumazet
2006-08-08 10:36 ` Andi Kleen
2006-08-08 12:29 ` Eric Dumazet
2006-08-08 12:47 ` Andi Kleen
2006-08-08 12:57 ` Eric Dumazet
2006-08-08 14:39 ` Ulrich Drepper
2006-08-08 15:11 ` Nick Piggin
2006-08-08 15:36 ` Ulrich Drepper
2006-08-08 16:22 ` Nick Piggin
2006-08-08 16:26 ` Nick Piggin
2006-08-08 16:49 ` Ulrich Drepper
2006-08-08 16:08 ` Eric Dumazet
2006-08-08 16:34 ` Nick Piggin
2006-08-08 16:49 ` Eric Dumazet
2006-08-08 16:59 ` Eric Dumazet
2006-08-09 1:56 ` Nick Piggin
2006-08-08 16:58 ` Ulrich Drepper
2006-08-08 17:08 ` Eric Dumazet
2006-08-09 1:58 ` Nick Piggin
2006-08-09 6:26 ` Eric Dumazet
2006-08-09 6:43 ` Eric Dumazet
2007-03-15 19:10 ` [PATCH 0/3] FUTEX : new PRIVATE futexes, SMP and NUMA improvements Eric Dumazet
2007-03-15 20:15 ` Nick Piggin
2007-03-16 8:05 ` Peter Zijlstra
2007-03-16 9:30 ` Eric Dumazet
2007-03-16 10:10 ` Peter Zijlstra
2007-03-16 10:30 ` Eric Dumazet
2007-03-16 10:36 ` Peter Zijlstra
2007-04-04 7:16 ` Ulrich Drepper
2007-04-05 17:49 ` [PATCH] FUTEX : new PRIVATE futexes Eric Dumazet
2007-04-05 20:43 ` Ulrich Drepper
2007-04-06 1:19 ` Nick Piggin
2007-04-06 5:53 ` Eric Dumazet
2007-04-06 11:50 ` Nick Piggin
2007-04-06 6:05 ` Hugh Dickins
2007-04-06 17:41 ` Jan Engelhardt
2007-04-06 12:26 ` Shared futexes (was [PATCH] FUTEX : new PRIVATE futexes) Peter Zijlstra
2007-04-06 13:02 ` Hugh Dickins
2007-04-06 13:15 ` Peter Zijlstra
2007-04-06 13:15 ` Nick Piggin
2007-04-06 13:22 ` Peter Zijlstra
2007-04-06 13:40 ` Nick Piggin
2007-04-06 12:31 ` [PATCH] FUTEX : new PRIVATE futexes Peter Zijlstra
2007-04-07 8:43 ` [PATCH, take4] " Eric Dumazet
2007-04-07 9:30 ` Nick Piggin
2007-04-07 10:00 ` Eric Dumazet
2007-04-11 7:22 ` Nick Piggin
2007-04-11 8:14 ` Eric Dumazet
2007-04-11 9:23 ` Nick Piggin
2007-04-11 9:30 ` Pierre Peiffer
2007-04-11 9:39 ` Nick Piggin
2007-04-11 9:40 ` Nick Piggin
2007-04-11 9:35 ` Eric Dumazet
2007-04-12 1:57 ` Nick Piggin
2007-04-07 11:18 ` Jakub Jelinek
2007-04-07 11:54 ` Eric Dumazet [this message]
2007-04-07 16:40 ` Ulrich Drepper
2007-04-07 22:15 ` Andrew Morton
2007-04-10 9:21 ` Eric Dumazet
2007-04-11 9:19 ` [PATCH, take5] " Eric Dumazet
2007-04-11 12:23 ` Rusty Russell
2007-04-26 12:55 ` [PATCH, take6] " Eric Dumazet
2007-04-26 13:35 ` Pierre Peiffer
2007-03-15 19:13 ` [PATCH 1/3] FUTEX : introduce PROCESS_PRIVATE semantic Eric Dumazet
2007-03-15 19:16 ` [PATCH 2/3] FUTEX : introduce private hashtables Eric Dumazet
2007-03-15 20:25 ` Nick Piggin
2007-03-15 21:09 ` Ulrich Drepper
2007-03-15 21:29 ` Nick Piggin
2007-03-15 22:59 ` William Lee Irwin III
2007-03-15 19:20 ` [PATCH 3/3] FUTEX : NUMA friendly global hashtable Eric Dumazet
2006-08-09 0:13 ` [RFC] NUMA futex hashing Ravikiran G Thirumalai
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