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>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
index 24941a7b659f48df5dcb469a2540d2cc817bf1e8..ab5134d920d9620b4ebcd92c12818d2f23e870c8 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
@@ -452,8 +452,9 @@ static int amdgpu_info_ioctl(struct drm_device *dev, void *data, struct drm_file
                return n ? -EFAULT : 0;
        }
        case AMDGPU_INFO_DEV_INFO: {
-               struct drm_amdgpu_info_device dev_info = {};
+               struct drm_amdgpu_info_device dev_info;
 
+               memset(&dev_info, 0, sizeof(dev_info));
                dev_info.device_id = dev->pdev->device;
                dev_info.chip_rev = adev->rev_id;
                dev_info.external_rev = adev->external_rev_id;