Description
In the Linux kernel, the following vulnerability has been resolved: drm/vc4: Prevent shader BO mappings from becoming writable vc4_gem_object_mmap() rejects a writable mapping of a validated shader BO, but leaves VM_MAYWRITE set. Userspace can map the BO read-only and then turn it writable with mprotect(). Validated shader BOs must stay read-only: the validator checks the instructions once and the GPU trusts them afterwards. A writable mapping lets userspace rewrite the code after validation, bypassing the validator. Clear VM_MAYWRITE on the read-only path so the mapping cannot be upgraded, as i915 already does for its read-only objects.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
463873d5701427f2964a0b4b72c45f1f14b6df87 to < 9f0ee411fc2d76333d6087c5862ffa907cf7a175affected463873d5701427f2964a0b4b72c45f1f14b6df87 to < 019e6ad247f7fd038d2e009789f6d9bfcccb1ae7affected463873d5701427f2964a0b4b72c45f1f14b6df87 to < 6deaa317201851c644c431b57682e54d06b35838affected463873d5701427f2964a0b4b72c45f1f14b6df87 to < fe168ef1d232d734d9998fd74822e2e20930dfffaffected463873d5701427f2964a0b4b72c45f1f14b6df87 to < 0c9e6367639548307d3f578f6943ce72c9d39087affected
Linux Linux
Default version status: affected
4.5affected0 to < 4.5unaffected6.6.148 to ≤ 6.6.*unaffected6.12.101 to ≤ 6.12.*unaffected6.18.42 to ≤ 6.18.*unaffected7.1.6 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/9f0ee411fc2d76333d6087c5862ffa907cf7a175 ↗
- https://git.kernel.org/stable/c/019e6ad247f7fd038d2e009789f6d9bfcccb1ae7 ↗
- https://git.kernel.org/stable/c/6deaa317201851c644c431b57682e54d06b35838 ↗
- https://git.kernel.org/stable/c/fe168ef1d232d734d9998fd74822e2e20930dfff ↗
- https://git.kernel.org/stable/c/0c9e6367639548307d3f578f6943ce72c9d39087 ↗