linux-kernel - Re: [PATCH v3 00/11] mm: Hardened usercopy

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Message-ID: <1469031727.30053.71.camel@redhat.com>
Date:	Wed, 20 Jul 2016 12:22:07 -0400
From:	Rik van Riel <riel@...hat.com>
To:	David Laight <David.Laight@...LAB.COM>,
	"'Kees Cook'" <keescook@...omium.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jan Kara <jack@...e.cz>,
	"kernel-hardening@...ts.openwall.com" 
	<kernel-hardening@...ts.openwall.com>,
	Will Deacon <will.deacon@....com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"sparclinux@...r.kernel.org" <sparclinux@...r.kernel.org>,
	"linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
	Christoph Lameter <cl@...ux.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>,
	Russell King <linux@...linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Catalin Marinas <catalin.marinas@....com>,
	PaX Team <pageexec@...email.hu>, Borislav Petkov <bp@...e.de>,
	Mathias Krause <minipli@...glemail.com>,
	Fenghua Yu <fenghua.yu@...el.com>,
	David Rientjes <rientjes@...gle.com>,
	Tony Luck <tony.luck@...el.com>,
	Andy Lutomirski <luto@...nel.org>,
	Josh Poimboeuf <jpoimboe@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Laura Abbott <labbott@...oraproject.org>,
	Brad Spengler <spender@...ecurity.net>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	Pekka Enberg <penberg@...nel.org>,
	Daniel Micay <danielmicay@...il.com>,
	Casey Schaufler <casey@...aufler-ca.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH v3 00/11] mm: Hardened usercopy

On Wed, 2016-07-20 at 16:02 +0000, David Laight wrote:
> From: Kees Cook
> > Sent: 20 July 2016 16:32
> ...
> > Yup: that's exactly what it's doing: walking up the stack. :)
> 
> Remind me to make sure all our customers run kernels with it
> disabled.

You want a single copy_from_user to write to data in
multiple stack frames?

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