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Date: Thu, 30 Mar 2017 12:54:54 -0700
From: Kees Cook <>
To: James Morse <>
Cc: "" <>, 
	"" <>, Will Deacon <>, 
	Catalin Marinas <>, Mark Rutland <>, 
	Pratyush Anand <>,
Subject: Re: [PATCH v4 0/3] arm64: usercopy: Implement stack frame object validation

On Thu, Mar 30, 2017 at 1:30 AM, James Morse <> wrote:
> Hi Kees,
> On 28/03/17 23:34, Kees Cook wrote:
>> On Thu, Feb 16, 2017 at 4:54 PM, Kees Cook <> wrote:
>>> On Thu, Feb 16, 2017 at 10:29 AM, James Morse <> wrote:
>>>> This version of Sahara's arch_within_stack_frames() series replaces the
>>>> open-coded stack walker with a call to arm64's existing walker.
>> Is this still in progress? Seemed like it was very close?
> Ah, sorry, I lost track of this when it jumped between mail folders... Sahara
> had comments on the last patch.
> How does all this fit with Al Viro's uaccess unification tree?:

It's orthogonal, though it results in bringing the hardened usercopy
to more architectures... (but the stack walker is still needed on a
per-arch basis).


Kees Cook
Pixel Security

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