linux-kernel - Re: [PATCH 0/5] x86-64: Remove syscall instructions at fixed addresses

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Message-ID: <20110531125415.GD10249@elte.hu>
Date:	Tue, 31 May 2011 14:54:15 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Andrew Lutomirski <luto@....edu>
Cc:	Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Jan Beulich <JBeulich@...ell.com>
Subject: Re: [PATCH 0/5] x86-64: Remove syscall instructions at fixed
 addresses


* Andrew Lutomirski <luto@....edu> wrote:

> [...] More importantly, vread_tsc contains an alternative and the 
> vDSO can't currently contain alternative instructions.  That can 
> probably be fixed, but it'll take a bit of work.

You could start with picking the more compatible alternative 
instruction initially. I don't at all mind losing half a cycle of 
performance in that case ... this code should be secure first.

Thanks,

	Ingo
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