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From: "H. Peter Anvin" <hpa@zytor.com>
To: Andi Kleen <andi@firstfloor.org>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>,
	Mikael Pettersson <mikpe@it.uu.se>,
	mingo@elte.hu, tglx@linutronix.de, torvalds@linux-foundation.org,
	akpm@linux-foundation.org, roland@redhat.com, drepper@redhat.com,
	Hongjiu.lu@intel.com, linux-kernel@vger.kernel.org,
	arjan@linux.intel.com, rmk+lkml@arm.linux.org.uk, dan@debian.org,
	asit.k.mallick@intel.com
Subject: Re: [RFC] x86: xsave/xrstor support, ucontext_t extensions
Date: Tue, 20 May 2008 07:55:46 -0700	[thread overview]
Message-ID: <4832E672.3090702@zytor.com> (raw)
In-Reply-To: <4832A173.6020203@firstfloor.org>

Andi Kleen wrote:
>> Ok. CPU folks are planning to make some of the bytes at the end of fxsave
>> image, SW usable.
> 
> Are they always zeroed in earlier CPUs though?  If not that wouldn't
> work 100% reliably because whatever cookie you put in could have been
> there before by chance.
> 
> I don't see anything in the SDM guaranteeing zeroing.
> 

I'm pretty sure they weren't zeroed by the CPUs.  If they weren't zeroed 
*by the kernel*, there might have been an information leak.

	-hpa

  parent reply	other threads:[~2008-05-20 15:00 UTC|newest]

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-05-13  1:10 [RFC] x86: xsave/xrstor support, ucontext_t extensions Suresh Siddha
2008-05-16 13:26 ` Mikael Pettersson
2008-05-18  1:34   ` Suresh Siddha
2008-05-19 14:52     ` Mikael Pettersson
2008-05-19 15:04       ` Andi Kleen
2008-05-19 16:29       ` H. Peter Anvin
2008-05-19 16:57         ` Suresh Siddha
2008-05-19 17:45           ` H. Peter Anvin
2008-05-20  1:57       ` Suresh Siddha
2008-05-20  8:58         ` Mikael Pettersson
2008-05-20 10:01         ` Andi Kleen
2008-05-20 13:19           ` Mikael Pettersson
2008-05-20 14:58             ` H. Peter Anvin
2008-05-20 15:20               ` Mikael Pettersson
2008-05-20 17:53                 ` Suresh Siddha
2008-05-20 17:59                   ` H. Peter Anvin
2008-05-22  0:28                   ` H. Peter Anvin
2008-05-22  0:53                     ` Roland McGrath
2008-05-22  1:38                       ` H. Peter Anvin
2008-05-22  6:40                         ` Roland McGrath
2008-05-22  7:18                           ` H. Peter Anvin
2008-05-22  8:49                       ` Mikael Pettersson
2008-05-22  8:57                     ` Mikael Pettersson
2008-05-22 20:56                       ` Suresh Siddha
2008-05-22 21:02                         ` H. Peter Anvin
2008-05-22 21:29                           ` Suresh Siddha
2008-05-22 21:34                             ` H. Peter Anvin
2008-05-22 22:22                               ` Mikael Pettersson
2008-05-23  1:48                               ` Suresh Siddha
2008-05-23  2:12                                 ` Roland McGrath
2008-05-23  2:49                                   ` H. Peter Anvin
2008-05-23 18:09                                     ` Suresh Siddha
2008-06-06  0:28                                       ` x86: xsave/xrstor support; " H. Peter Anvin
2008-06-06 20:14                                         ` Suresh Siddha
2008-06-06 23:03                                           ` H. Peter Anvin
2008-05-23  2:45                                 ` [RFC] x86: xsave/xrstor support, " H. Peter Anvin
2008-05-23 11:46                                   ` Mikael Pettersson
2008-05-23 12:11                                     ` Andi Kleen
2008-05-22 21:32                           ` Chris Wright
2008-05-22 22:15                             ` Mikael Pettersson
2008-05-22 22:29                               ` Chris Wright
2008-05-23  0:32                                 ` H. Peter Anvin
2008-05-23  0:44                                   ` Chris Wright
2008-05-22 22:36                           ` Mikael Pettersson
2008-05-23  0:33                             ` H. Peter Anvin
2008-05-23  0:42                               ` Suresh Siddha
2008-05-23  1:33                                 ` Roland McGrath
2008-05-23 16:57                                   ` H. Peter Anvin
2008-05-23 17:50                                     ` Suresh Siddha
2008-05-23  2:27                                 ` H. Peter Anvin
2008-05-20 17:57                 ` H. Peter Anvin
2008-05-20 14:55           ` H. Peter Anvin [this message]
2008-05-20 15:03             ` Andi Kleen
2008-05-20 20:10               ` Roland McGrath
2008-05-22  0:05                 ` H. Peter Anvin
2008-05-22  0:47                   ` Roland McGrath
2008-05-22  8:14                     ` Andi Kleen

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