diff options
| author | Evan Quan <evan.quan@amd.com> | 2017-10-16 16:51:28 +0800 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2017-10-25 23:09:38 -0400 |
| commit | 4694257e7d4757fedaa8dcd18bb5ff52e76a2765 (patch) | |
| tree | 7495d845c5878ac1d2497156d5705787bad30df0 /drivers/gpu/drm/amd/amdgpu/psp_v3_1.c | |
| parent | 0722382dcc4fd4e53c12db2c2eda9c5c9c903432 (diff) | |
drm/amdgpu/psp: prevent page fault by checking write_frame address(v4)
- Prevent a possible buffer overflow when updating the ring buffer by
bounds checking the command frame against the available space in the
ring buffer.
v2: update the ring_buffer_end address
v3: update the commit log
v4: squash in print fix (Michel)
Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/psp_v3_1.c')
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/psp_v3_1.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/psp_v3_1.c b/drivers/gpu/drm/amd/amdgpu/psp_v3_1.c index cee5c396b277..c7bcfe8e286c 100644 --- a/drivers/gpu/drm/amd/amdgpu/psp_v3_1.c +++ b/drivers/gpu/drm/amd/amdgpu/psp_v3_1.c @@ -367,6 +367,9 @@ int psp_v3_1_cmd_submit(struct psp_context *psp, unsigned int psp_write_ptr_reg = 0; struct psp_gfx_rb_frame * write_frame = psp->km_ring.ring_mem; struct psp_ring *ring = &psp->km_ring; + struct psp_gfx_rb_frame *ring_buffer_start = ring->ring_mem; + struct psp_gfx_rb_frame *ring_buffer_end = ring_buffer_start + + ring->ring_size / sizeof(struct psp_gfx_rb_frame) - 1; struct amdgpu_device *adev = psp->adev; uint32_t ring_size_dw = ring->ring_size / 4; uint32_t rb_frame_size_dw = sizeof(struct psp_gfx_rb_frame) / 4; @@ -378,9 +381,16 @@ int psp_v3_1_cmd_submit(struct psp_context *psp, /* write_frame ptr increments by size of rb_frame in bytes */ /* psp_write_ptr_reg increments by size of rb_frame in DWORDs */ if ((psp_write_ptr_reg % ring_size_dw) == 0) - write_frame = ring->ring_mem; + write_frame = ring_buffer_start; else - write_frame = ring->ring_mem + (psp_write_ptr_reg / rb_frame_size_dw); + write_frame = ring_buffer_start + (psp_write_ptr_reg / rb_frame_size_dw); + /* Check invalid write_frame ptr address */ + if ((write_frame < ring_buffer_start) || (ring_buffer_end < write_frame)) { + DRM_ERROR("ring_buffer_start = %p; ring_buffer_end = %p; write_frame = %p\n", + ring_buffer_start, ring_buffer_end, write_frame); + DRM_ERROR("write_frame is pointing to address out of bounds\n"); + return -EINVAL; + } /* Initialize KM RB frame */ memset(write_frame, 0, sizeof(struct psp_gfx_rb_frame)); |