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| author | Dave Airlie <airlied@redhat.com> | 2010-08-14 12:20:34 +0200 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2010-08-17 06:52:25 +0200 |
| commit | 1b2f1489633888d4a06028315dc19d65768a1c05 (patch) | |
| tree | 8d5d3bfec854d6c96c19a781bf9c873409b74210 /include/drm/i915_drm.h | |
| parent | drm: stop information leak of old kernel stack. (diff) | |
| download | linux-1b2f1489633888d4a06028315dc19d65768a1c05.tar.xz linux-1b2f1489633888d4a06028315dc19d65768a1c05.zip | |
drm: block userspace under allocating buffer and having drivers overwrite it (v2)
With the current screwed but its ABI, ioctls for the drm, Linus pointed out that we could allow userspace to specify the allocation size, but we pass it to the driver which then uses it blindly to store a struct. Now if userspace specifies the allocation size as smaller than the driver needs, the driver can possibly overwrite memory.
This patch restructures the driver ioctls so we store the structure size we are expecting, and make sure we allocate at least that size. The copy from/to userspace are still restricted to the size the user specifies, this allows ioctl structs to grow on both sides of the equation.
Up until now we didn't really use the DRM_IOCTL defines in the kernel, so this cleans them up and adds them for nouveau.
v2:
fix nouveau pushbuf arg (thanks to Ben for pointing it out)
Reported-by: Linus Torvalds <torvalds@linuxfoundation.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'include/drm/i915_drm.h')
| -rw-r--r-- | include/drm/i915_drm.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/drm/i915_drm.h b/include/drm/i915_drm.h index 7f0028e1010b..000357bf3ac8 100644 --- a/include/drm/i915_drm.h +++ b/include/drm/i915_drm.h @@ -206,6 +206,7 @@ typedef struct _drm_i915_sarea { #define DRM_IOCTL_I915_SET_VBLANK_PIPE DRM_IOW( DRM_COMMAND_BASE + DRM_I915_SET_VBLANK_PIPE, drm_i915_vblank_pipe_t) #define DRM_IOCTL_I915_GET_VBLANK_PIPE DRM_IOR( DRM_COMMAND_BASE + DRM_I915_GET_VBLANK_PIPE, drm_i915_vblank_pipe_t) #define DRM_IOCTL_I915_VBLANK_SWAP DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_VBLANK_SWAP, drm_i915_vblank_swap_t) +#define DRM_IOCTL_I915_HWS_ADDR DRM_IOW(DRM_COMMAND_BASE + DRM_I915_HWS_ADDR, struct drm_i915_gem_init) #define DRM_IOCTL_I915_GEM_INIT DRM_IOW(DRM_COMMAND_BASE + DRM_I915_GEM_INIT, struct drm_i915_gem_init) #define DRM_IOCTL_I915_GEM_EXECBUFFER DRM_IOW(DRM_COMMAND_BASE + DRM_I915_GEM_EXECBUFFER, struct drm_i915_gem_execbuffer) #define DRM_IOCTL_I915_GEM_EXECBUFFER2 DRM_IOW(DRM_COMMAND_BASE + DRM_I915_GEM_EXECBUFFER2, struct drm_i915_gem_execbuffer2) |