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drm: vmwgfx: fix information leak to userland

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Structure drm_vmw_fence_rep is copied to userland with field "pad64"
uninitialized.  It leads to leaking of contents of kernel stack memory.

Signed-off-by: Vasiliy Kulikov <segooon@gmail.com>
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Kulikov Vasiliy 2010-11-06 14:41:16 +00:00 committed by Dave Airlie
parent ec3789cccc
commit dccb2a952b
1 changed files with 1 additions and 0 deletions
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drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
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@ -691,6 +691,7 @@ int vmw_execbuf_ioctl(struct drm_device *dev, void *data,
fence_rep.error = ret;
fence_rep.fence_seq = (uint64_t) sequence;
fence_rep.pad64 = 0;
user_fence_rep = (struct drm_vmw_fence_rep __user *)
(unsigned long)arg->fence_rep;