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Date: Thu, 21 Feb 2019 15:29:39 -0800
From: Kees Cook <>
To: "Perla, Enrico" <>
Cc: Andy Lutomirski <>, "Reshetova, Elena" <>, 
	Andy Lutomirski <>, Jann Horn <>, 
	Peter Zijlstra <>, 
	"" <>, 
	"" <>, "" <>, "" <>, 
	"" <>
Subject: Re: [RFC PATCH] x86/entry/64: randomize kernel stack offset upon
 system call

On Wed, Feb 20, 2019 at 2:53 PM Kees Cook <> wrote:
> BTW, the attack that inspired grsecurity's RANDKSTACK is described in
> these slides (lots of steps, see slide 79):

Sorry, as PaX Team reminded me, I misremembered this. RANDKSTACK
already existed. It was STACKLEAK that was created in response to this
particular attack. I still think this attack is worth understanding to
see what hoops must be jumped through when dealing with stack
randomization (and other defenses).

Kees Cook

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