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SubjectRe: [PATCH v5 1/2] drm/amd: validate user pitch alignment
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On 2018-12-30 2:00 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.
>
> Cc: stable@vger.kernel.org # v4.2+
> Signed-off-by: Yu Zhao <yuzhao@google.com>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_display.c | 16 ++++++++++++++++
> 1 file changed, 16 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
> index 15ce7e681d67..16af80ccd0a0 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
> @@ -527,6 +527,22 @@ 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 = mode_cmd->pitches[0] / cpp;
> +
> + if (pitch < mode_cmd->width) {
> + DRM_DEBUG_KMS("Expecting pitch(%d)/cpp(%d) >= width(%d)\n",
> + mode_cmd->pitches[0], cpp, mode_cmd->width);
> + return ERR_PTR(-EINVAL);
> + }

This should possibly be tested in drm_internal_framebuffer_create instead.


> + pitch = amdgpu_align_pitch(adev, pitch, cpp, false);
> + if (mode_cmd->pitches[0] != pitch) {
> + DRM_DEBUG_KMS("Invalid pitch: expecting %d but got %d\n",
> + pitch, mode_cmd->pitches[0]);
> + return ERR_PTR(-EINVAL);
> + }
>
> obj = drm_gem_object_lookup(file_priv, mode_cmd->handles[0]);
> if (obj == NULL) {
>

Apart from the above, the v5 series looks good to me.


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

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