linux-kernel - Re: [BUG] completely bonkers use of set_need_resched + VM_FAULT

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Message-ID: <5232CF56.8060605@vmware.com>
Date:	Fri, 13 Sep 2013 10:39:50 +0200
From:	Thomas Hellstrom <thellstrom@...are.com>
To:	Daniel Vetter <daniel.vetter@...ll.ch>
CC:	Maarten Lankhorst <maarten.lankhorst@...onical.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Dave Airlie <airlied@...ux.ie>,
	intel-gfx <intel-gfx@...ts.freedesktop.org>,
	dri-devel <dri-devel@...ts.freedesktop.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [BUG] completely bonkers use of set_need_resched + VM_FAULT_NOPAGE

On 09/13/2013 10:32 AM, Daniel Vetter wrote:
> On Fri, Sep 13, 2013 at 10:23 AM, Thomas Hellstrom
> <thellstrom@...are.com> wrote:
>> As previously mentioned, copy_from_user should return -EFAULT, since the
>> VMAs are marked with VM_IO. It should not recurse into fault(), so evil
>> user-space looses.
> I haven't put a printk in the code to prove this, but gem mmap also
> sets VM_IO in drm_gem_mmap_obj. And we can very much hit our own fault
> handler and deadlock ....

If this is indeed true, I guess I need to accept the fact that my 
solution is bad.
(and worse I can't blame not having my morning coffee).

I'll take a deeper look.
/Thomas
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