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

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Message-ID: <BANLkTin9xfS_X9Bscf1qnNZMK=JBgpzV8Q@mail.gmail.com>
Date:	Mon, 30 May 2011 22:33:17 -0400
From:	Andrew Lutomirski <luto@....edu>
To:	Ingo Molnar <mingo@...e.hu>
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

On Sun, May 29, 2011 at 3:19 PM, Ingo Molnar <mingo@...e.hu> wrote:
> Btw., do you know CONFIG_X86_PTDUMP=y and /debug/kernel_page_tables?
> You could use that to double check that after your patches all
> executable (and fixed address) pages are removed [or are harmless].

Done.  Now there's only one user-executable page and it's mostly harmless.

Maybe I'll try to get rid of vread_tsc and vread_hpet later on to make
it even more harmless.

--Andy
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