Re: [PATCH xf86-video-intel v2] SNA: fix PRIME output support since xserver 1.20

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Sat, Nov 16, 2019 at 05:13:17PM +0100, Peter Wu wrote:
> On Fri, Nov 15, 2019 at 08:14:05PM +0200, Ville Syrjälä wrote:
> > On Fri, Nov 15, 2019 at 04:32:47PM +0100, Peter Wu wrote:
> > > Since "Make PixmapDirtyUpdateRec::src a DrawablePtr" in xserver, the
> > > "src" pointer might point to the root window (created by the server)
> > > instead of a pixmap (as created by xf86-video-intel). Use
> > > get_drawable_pixmap to handle both cases.
> > > 
> > > When built with -fsanitize=address, the following test on a hybrid
> > > graphics laptop will trigger a heap-buffer-overflow error due to
> > > to_sna_from_pixmap receiving a window instead of a pixmap:
> > > 
> > >     xrandr --setprovideroutputsource modesetting Intel
> > >     xrandr --output DP-1-1 --mode 2560x1440  # should not crash
> > >     glxgears  # should display gears on both screens
> > > 
> > > With nouveau instead of modesetting, it does not crash but the external
> > > monitor remains blank aside from a mouse cursor. This patch fixes both.
> > > 
> > > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=100086
> > 
> > Also
> > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=111976
> 
> I marked this bug as duplicate of the former since it is the same issue.
> 
> About the CI failure
> (https://lists.freedesktop.org/archives/intel-gfx/2019-November/220187.html),
> should I be concerned? I can't see what tree it is trying to apply the
> patch to. Is it actually trying to apply it to xf86-video-intel, or is
> it trying the Linux kernel instead?

Yeah, I think it's trying to apply it to the kernel. We have no CI
for the ddx unfortunately.

> 
> > > Signed-off-by: Peter Wu <peter@lekensteyn.nl>
> > > ---
> > > v1: https://lists.freedesktop.org/archives/intel-gfx/2018-August/173522.html
> > > v2: rebased on current master (2.99.917-893-gbff5eca4), reworded commit.
> > > 
> > > This patch has been tested at https://bugs.archlinux.org/task/64238, I
> > > have additionally tested it with both modesetting and nouveau under
> > > ASAN, the modesetting ASAN trace for unpatched intel can be found at:
> > > https://bugs.freedesktop.org/show_bug.cgi?id=100086#c24
> > > 
> > > commit 2.99.917-891-g581ddc5d ("sna: Fix compiler warnings due to
> > > DrawablePtr vs. PixmapPtr") incorporated all compiler warning fixes from
> > > v1 of this patch, but unfortunately lacks this crucial bugfix.
> > > ---
> > >  src/sna/sna_accel.c | 6 +++---
> > >  1 file changed, 3 insertions(+), 3 deletions(-)
> > > 
> > > diff --git a/src/sna/sna_accel.c b/src/sna/sna_accel.c
> > > index fa386ff6..ee857a14 100644
> > > --- a/src/sna/sna_accel.c
> > > +++ b/src/sna/sna_accel.c
> > > @@ -17684,10 +17684,10 @@ static void sna_accel_post_damage(struct sna *sna)
> > >  			continue;
> > >  
> > >  #ifdef HAS_DIRTYTRACKING_DRAWABLE_SRC
> > > -		assert(dirty->src->type == DRAWABLE_PIXMAP);
> > > +		src = get_drawable_pixmap(dirty->src);
> > > +#else
> > > +		src = dirty->src;
> > >  #endif
> > > -
> > > -		src = (PixmapPtr)dirty->src;
> > >  		dst = dirty->slave_dst->master_pixmap;
> > >  
> > >  		region.extents.x1 = dirty->x;
> > > -- 
> > > 2.23.0
> > 
> > -- 
> > Ville Syrjälä
> > Intel

-- 
Ville Syrjälä
Intel
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