linux-kernel - Re: [PATCH v2 01/11] mm: Implement stack frame object validation

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Date:	Wed, 13 Jul 2016 15:01:28 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Kees Cook <keescook@...omium.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Rik van Riel <riel@...hat.com>,
	Casey Schaufler <casey@...aufler-ca.com>,
	PaX Team <pageexec@...email.hu>,
	Brad Spengler <spender@...ecurity.net>,
	Russell King <linux@...linux.org.uk>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	Tony Luck <tony.luck@...el.com>,
	Fenghua Yu <fenghua.yu@...el.com>,
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	David Rientjes <rientjes@...gle.com>,
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	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
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	<kernel-hardening@...ts.openwall.com>,
	Josh Poimboeuf <jpoimboe@...hat.com>
Subject: Re: [PATCH v2 01/11] mm: Implement stack frame object validation

On Wed, Jul 13, 2016 at 2:55 PM, Kees Cook <keescook@...omium.org> wrote:
> This creates per-architecture function arch_within_stack_frames() that
> should validate if a given object is contained by a kernel stack frame.
> Initial implementation is on x86.
>
> This is based on code from PaX.
>

This, along with Josh's livepatch work, are two examples of unwinders
that matter for correctness instead of just debugging.  ISTM this
should just use Josh's code directly once it's been written.

--Andy