linux-kernel - Re: [PATCH v1 00/12] x86, alternatives: Instruction padding and more robust JMPs

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Date:	Tue, 24 Feb 2015 12:04:55 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	X86 ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 00/12] x86, alternatives: Instruction padding and more
 robust JMPs

On Wed, Feb 18, 2015 at 10:20:13PM +0100, Ingo Molnar wrote:
> Do you have any stats about how many such (affected) patch 
> sites we have in say the 64-bit defconfig kernel?

It is a good thing I have a tool to dump the alternatives patch sites
and what gets replaced by what. Because now I can create such stats just
like that! And hpa was questioning that tool's justification at the time
:-)

Anyway, here are the stats:

x86_64 defconfig:

Alternatives sites total:		2478
Total padding added (in Bytes):		6051

The padding is currently done for:

X86_FEATURE_ALWAYS
X86_FEATURE_ERMS
X86_FEATURE_LFENCE_RDTSC
X86_FEATURE_MFENCE_RDTSC
X86_FEATURE_SMAP

This is with the latest version of the patchset. Of course, on each
machine the alternatives sites actually being patched are a subset of
the total number.

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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