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CVE-2024-0671

Status Candidate

Overview

Use After Free vulnerability in Arm Ltd Midgard GPU Kernel Driver, Arm Ltd Bifrost GPU Kernel Driver, Arm Ltd Valhall GPU Kernel Driver, Arm Ltd Arm 5th Gen GPU Architecture Kernel Driver allows a local non-privileged user to make improper GPU memory processing operations to gain access to already freed memory.This issue affects Midgard GPU Kernel Driver: from r19p0 through r32p0; Bifrost GPU Kernel Driver: from r7p0 through r48p0; Valhall GPU Kernel Driver: from r19p0 through r48p0; Arm 5th Gen GPU Architecture Kernel Driver: from r41p0 through r48p0.

Related Files

Arm Mali 5th Gen Dangling ATE
Posted May 13, 2024
Authored by Jann Horn, Google Security Research

In mmu_insert_pages_no_flush(), when a HUGE_HEAD page is mapped to a 2M aligned GPU address, this is done by creating an Address Translation Entry (ATE) at MIDGARD_MMU_LEVEL(2) (in other words, an ATE covering 2M of memory is created). This is wrong because it assumes that at least 2M of memory should be mapped. mmu_insert_pages_no_flush() can be called in cases where less than that should be mapped, for example when creating a short alias of a big native allocation. Later, when kbase_mmu_teardown_pgd_pages() tries to tear down this region, it will detect that unmapping a subsection of a 2M ATE is not possible and write a log message complaining about this, but then proceed as if everything was fine while leaving the ATE intact. This means the higher-level code will proceed to free the referenced physical memory while the ATE still points to it.

tags | exploit
advisories | CVE-2024-0671
SHA-256 | 02b7002e9ef87f42111b8b994ec26a71eab28f5f71c23d3899c25a6cc7a85c92
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