linux-kernel - Re: [PATCH] x86: Add support for 64bit get

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Message-ID: <ea6b316f-c142-4fc0-9f74-281380ab1dac@email.android.com>
Date:	Fri, 08 Feb 2013 11:08:52 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Ville Syrjälä <ville.syrjala@...ux.intel.com>
CC:	linux-kernel@...r.kernel.org, x86@...nel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jamie Lokier <jamie@...reable.org>,
	Russell King <rmk+kernel@....linux.org.uk>
Subject: Re: [PATCH] x86: Add support for 64bit get_user() on x86-32

Yes, or anything else getting a pointer in memory from user space.

"Ville Syrjälä" <ville.syrjala@...ux.intel.com> wrote:

>On Fri, Feb 08, 2013 at 09:30:05AM -0800, H. Peter Anvin wrote:
>> On 02/08/2013 08:24 AM, Ville Syrjälä wrote:
>> >>
>> >> How have you tested it?
>> > 
>> > I've tried it with my drm/kms atomic pageflip/modeset code. I also
>had
>> > a small test module that did a couple of different sized get_user()
>> > calls, but I'll be damned if I can find it again.
>> > 
>> 
>> Did you see the warning spewage for pointers when you built it?
>
>Apparently my config was too small to genenerate enough of those to
>catch
>my eye. Most of those seem to come from drivers that have pointers in
>their
>ioctl structs, no?

-- 
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