linux-kernel - Re: [GIT PULL] kdbus for 4.1-rc1

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Date:	Tue, 21 Apr 2015 12:17:49 +0200
From:	David Herrmann <dh.herrmann@...il.com>
To:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
Cc:	Andy Lutomirski <luto@...capital.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Richard Weinberger <richard@....at>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Jiri Kosina <jkosina@...e.cz>,
	Al Viro <viro@...iv.linux.org.uk>,
	Borislav Petkov <bp@...en8.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arnd Bergmann <arnd@...db.de>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Tom Gundersen <teg@...m.no>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Daniel Mack <daniel@...que.org>,
	Djalal Harouni <tixxdz@...ndz.org>
Subject: Re: [GIT PULL] kdbus for 4.1-rc1

Hi

On Tue, Apr 21, 2015 at 11:35 AM, One Thousand Gnomes
<gnomes@...rguk.ukuu.org.uk> wrote:
>> On top of that, I think that someone into resource management needs to
>> seriously consider whether having a broadcast send do get_user_pages
>> or the equivalent on pages supplied by untrusted recipients (plural!)
>> is a good idea.
>
> Oh but its so much fun if you pass pages belonging to a device driver, or
> pass bits of a GEM object thereby keeping entire graphics textures
> referenced 8)

We do not use GUP, nor do we pass around pinned pages. All we use is
__vfs_read() / __vfs_write() on shmem. Whether generic_file_write() /
copy_from_user() internally relies on GUP or not, is an orthogonal
issue that does not belong here.

Thanks
David
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