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Date:	Thu, 17 Jul 2014 11:48:55 -0700
From:	Kees Cook <>
To:	Andy Lutomirski <>
Cc:, "H. Peter Anvin" <>,
	"Theodore Ts'o" <>,
	LKML <>,
	"" <>,
	Daniel Borkmann <>,
	Srivatsa Vaddagiri <>,
	Raghavendra K T <>,
	Gleb Natapov <>,
	Paolo Bonzini <>,,
	Andrew Honig <>
Subject: Re: [PATCH v4 5/5] x86,kaslr: Use MSR_KVM_GET_RNG_SEED for KASLR if available

On Thu, Jul 17, 2014 at 11:22 AM, Andy Lutomirski <> wrote:
> It's considerably better than any of the alternatives on KVM.
> Rather than reinventing all of the cpu feature query code, this fixes
> native_cpuid to work in PIC objects.
> I haven't combined it with boot/cpuflags.c's cpuid implementation:
> including asm/processor.h from boot/cpuflags.c results in a flood of
> unrelated errors, and fixing it might be messy.
> Signed-off-by: Andy Lutomirski <>

This will be very nice to have under kvm!

Reviewed-by: Kees Cook <>



Kees Cook
Chrome OS Security
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