Huawei EulerOS: CVE-2021-47200: kernel security update
Description
In the Linux kernel, the following vulnerability has been resolved: drm/prime: Fix use after free in mmap with drm_gem_ttm_mmap drm_gem_ttm_mmap() drops a reference to the gem object on success. If the gem object's refcount == 1 on entry to drm_gem_prime_mmap(), that drop will free the gem object, and the subsequent drm_gem_object_get() will be a UAF. Fix by grabbing a reference before calling the mmap helper. This issue was forseen when the reference dropping was adding in commit 9786b65bc61ac ("drm/ttm: fix mmap refcounting"): "For that to work properly the drm_gem_object_get() call in drm_gem_ttm_mmap() must be moved so it happens before calling obj->funcs->mmap(), otherwise the gem refcount would go down to zero."
Solution(s)
- huawei-euleros-2_0_sp12-upgrade-bpftool
- huawei-euleros-2_0_sp12-upgrade-kernel
- huawei-euleros-2_0_sp12-upgrade-kernel-abi-stablelists
- huawei-euleros-2_0_sp12-upgrade-kernel-tools
- huawei-euleros-2_0_sp12-upgrade-kernel-tools-libs
- huawei-euleros-2_0_sp12-upgrade-python3-perf
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