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Date:	Tue, 16 Sep 2014 22:34:18 -0700
From:	Andy Lutomirski <>
To:	Richard Larocque <>
Cc:	Ingo Molnar <>,
	Thomas Gleixner <>,
	"H. Peter Anvin" <>,
	Filipe Brandenburger <>,
	Michael Davidson <>,
	Greg Thelen <>, X86 ML <>,
	Linux API <>,
	"" <>
Subject: Re: [PATCH] x86/vdso: Add prctl to set per-process VDSO load

On Tue, Sep 16, 2014 at 10:00 PM, Andy Lutomirski <> wrote:
> On Tue, Sep 16, 2014 at 6:18 PM, Richard Larocque <> wrote:
>> On Tue, Sep 16, 2014 at 5:27 PM, Andy Lutomirski <> wrote:
> I think that the patch should instead tweak the vvar mapping to tell
> the vdso not to use rdtsc.  It should be based on this:
> and I'll talk to hpa tomorrow about about getting that, or something
> like it, into the tip tree.  In particular, you'll need this:

Crud.  Now that I've said that, I realize that this won't work right
if rdtscp is off.  I'll drop that patch.

I don't think that this changes the conclusion.  It should be possible
to swap out the vvar page to keep the vdso working even without rdtsc


> Also, this kind of inheritable restriction may end up requiring
> no_new_privs or CAP_SYS_ADMIN to be secure.
> --Andy

Andy Lutomirski
AMA Capital Management, LLC
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