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Message-ID: <16741.1466120212@turing-police.cc.vt.edu>
Date: Thu, 16 Jun 2016 19:36:52 -0400
From: Valdis.Kletnieks@...edu
To: Kees Cook <keescook@...omium.org>
Cc: "kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>,
Brad Spengler <spender@...ecurity.net>,
PaX Team <pageexec@...email.hu>,
Casey Schaufler <casey.schaufler@...el.com>,
Rik van Riel <riel@...hat.com>, Christoph Lameter <cl@...ux.com>,
Pekka Enberg <penberg@...nel.org>,
David Rientjes <rientjes@...gle.com>,
Joonsoo Kim <iamjoonsoo.kim@....com>,
Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC][PATCH v2 0/4] mm: Hardened usercopy
On Wed, 15 Jun 2016 18:38:31 -0700, Kees Cook said:
> On Wed, Jun 15, 2016 at 6:30 PM, <Valdis.Kletnieks@...edu> wrote:
> > So I guess you can stick a:
> >
> > Tested-By: Valdis Kletnieks <valdis.kletnieks@...edu>
> >
> > on that patch set. :)
>
> Awesome, thanks! It's good to know the system operated normally up
> until that point. I'm glad to have lots of people testing.
Following up - I did a BFI patch against the NVidia driver that basically
tagged all its memory allocations as USERCOPY, and the resulting kernel
has gotten up to multiuser and XOrg. Been up for a half hour doing my usual
stuff on the laptop, and no usercopy whines.
Workload: email, pidgin IM, Google Chrome with some 30 tabs, some streaming
audio. Plenty of room for corner cases still lurking, but all the basic
stuff is working. I may whomp on it with trinity for a while, see if
anything falls out...
Today's surprise: VirtualBox 5.0.22 was released - and it was able to boot
a Windows 7 image to the desktop without complaint. Something still wonky
there, as it gets unstable at some point, but given the lack of dmesg entries,
I suspect it's a linux-next regression rather than a usercopy issue. Will
debug more later tonight.
NVidia patch attached as guidance to what's needed for anybody else who's facing
patching an out-of-tree module.
View attachment "nvidia-367.24-usercopy-BFI.patch" of type "text/plain " (2367 bytes)
Content of type "application/pgp-signature" skipped
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