Commit 8ea180f1c7ec137310ea2e66300485dbda93baad
Committed by
Greg Kroah-Hartman
1 parent
f1b4bdde2b
drm/amdgpu: Prevent kernel-infoleak in amdgpu_info_ioctl()
commit 543e8669ed9bfb30545fd52bc0e047ca4df7fb31 upstream. Compiler leaves a 4-byte hole near the end of `dev_info`, causing amdgpu_info_ioctl() to copy uninitialized kernel stack memory to userspace when `size` is greater than 356. In 2015 we tried to fix this issue by doing `= {};` on `dev_info`, which unfortunately does not initialize that 4-byte hole. Fix it by using memset() instead. Cc: stable@vger.kernel.org Fixes: c193fa91b918 ("drm/amdgpu: information leak in amdgpu_info_ioctl()") Fixes: d38ceaf99ed0 ("drm/amdgpu: add core driver (v4)") Suggested-by: Dan Carpenter <dan.carpenter@oracle.com> Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Peilin Ye <yepeilin.cs@gmail.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Showing 1 changed file with 2 additions and 1 deletions Side-by-side Diff
drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
... | ... | @@ -667,9 +667,10 @@ |
667 | 667 | return n ? -EFAULT : 0; |
668 | 668 | } |
669 | 669 | case AMDGPU_INFO_DEV_INFO: { |
670 | - struct drm_amdgpu_info_device dev_info = {}; | |
670 | + struct drm_amdgpu_info_device dev_info; | |
671 | 671 | uint64_t vm_size; |
672 | 672 | |
673 | + memset(&dev_info, 0, sizeof(dev_info)); | |
673 | 674 | dev_info.device_id = dev->pdev->device; |
674 | 675 | dev_info.chip_rev = adev->rev_id; |
675 | 676 | dev_info.external_rev = adev->external_rev_id; |