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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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