drm/amdgpu: fix user fence handling once more

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Same problem as with the VM page tables. The user fence address must be
determined before the job is scheduled, not when the IB is executed.

This fixes a security problem where user fences could be used to overwrite
any part of VRAM.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Chunming Zhou <david1.zhou@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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This commit is contained in:

Christian König 2016-06-29 13:26:41 +02:00 • committed by Alex Deucher

parent 5662815950

commit b5f5acbc87

4 changed files with 9 additions and 14 deletions

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3

drivers/gpu/drm/amd/amdgpu/amdgpu.h

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12

drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c

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7

drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c

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1

drivers/gpu/drm/amd/amdgpu/amdgpu_job.c

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