linux-kernel - Re: [PATCH] drm: Use kvzalloc for allocating blob property memory

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Message-ID: <32deece3-b583-ca58-cd41-ba11846240c8@daenzer.net>
Date:   Fri, 29 Jun 2018 18:27:28 +0200
From:   Michel Dänzer <michel@...nzer.net>
To:     Ville Syrjälä <ville.syrjala@...ux.intel.com>
Cc:     David Airlie <airlied@...ux.ie>, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH] drm: Use kvzalloc for allocating blob property memory

On 2018-06-29 06:12 PM, Ville Syrjälä wrote:
> On Fri, Jun 29, 2018 at 04:27:10PM +0200, Michel Dänzer wrote:
>> From: Michel Dänzer <michel.daenzer@....com>
>>
>> The property size may be controlled by userspace, can be large (I've
>> seen failure with order 4, i.e. 16 pages / 64 KB) and doesn't need to be
>> physically contiguous.
> 
> I wonder if we should enforce some kind of reasonable limit
> on the blob size. Looks like we allow anything up to
> ULONG_MAX currently. We can't tell at createblob time how
> the thing is going to be used, so can't have any kind
> of property specific limit unfortunately.

The failure I was seeing was for a gamma LUT, so a size limit alone
cannot solve the issue.


-- 
Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer