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SubjectRe: [PATCH 2/3] drm/amd: validate user pitch alignment
On Fri, Dec 21, 2018 at 10:07:26AM +0100, Michel Dänzer wrote:
> On 2018-12-21 4:10 a.m., Yu Zhao wrote:
> > Userspace may request pitch alignment that is not supported by GPU.
> > Some requests 32, but GPU ignores it and uses default 64 when cpp is
> > 4. If GEM object is allocated based on the smaller alignment, GPU
> > DMA will go out of bound.
> >
> > For GPU that does frame buffer compression, DMA writing out of bound
> > memory will cause memory corruption.
> >
> > Signed-off-by: Yu Zhao <yuzhao@google.com>
> > ---
> > drivers/gpu/drm/amd/amdgpu/amdgpu_display.c | 9 +++++++++
> > 1 file changed, 9 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
> > index e309d26170db..755daa332f8a 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
> > @@ -527,6 +527,15 @@ amdgpu_display_user_framebuffer_create(struct drm_device *dev,
> > struct drm_gem_object *obj;
> > struct amdgpu_framebuffer *amdgpu_fb;
> > int ret;
> > + struct amdgpu_device *adev = dev->dev_private;
> > + int cpp = drm_format_plane_cpp(mode_cmd->pixel_format, 0);
> > + int pitch = amdgpu_align_pitch(adev, mode_cmd->width, cpp, false);
>
> Also, this needs to use mode_cmd->pitches[0] instead of mode_cmd->width,
> otherwise it'll spuriously fail for larger but well-aligned pitches.

Actually mode_cmd->pitches[0] is aligned mode_cmd->width multiplied
by cpp. So we can't just use mode_cmd->pitches[0]. And I'm not sure
if the hardware works with larger alignment (it certainly ignores
smaller alignment).

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