On 03/21/2018 09:51 PM, Ville Syrjälä wrote:
On Wed, Mar 21, 2018 at 09:45:09PM +0100, Thomas Hellstrom wrote:
Hi, Ville,
On 11/14/2017 07:32 PM, Ville Syrjala wrote:
From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Currently userspace is allowed to feed in any king of garbage in the
high bits of the mode flags/type, as are drivers when probing modes.
Reject any mode with bogus flags/type.
Hopefully this won't break any current userspace...
Unfortunately this breaks xf86-video-vmware which currently leaves the
mode->type uninitialized :(.
That code is inherited from the old gallium xorg state tracker. I don't
know whether it has spread elsewhere but the symptoms are that the X
server frequently dies failing to set screen resources, a very
uninformative error.
I'll fix the xf86-video-vmware driver, but I guess we need to back out
the mode->type check.
Dang. So the flags check is fine but type check is not?
Yes, we copy the flags field untranslated from xorg's
DisplayModePtr::Flags field which seems to be what
xf86-video-modesetting does as well, so I guess we should be OK there.
/Thomas
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