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Arm Mali CSF Missing Buffer Size Check

Arm Mali CSF Missing Buffer Size Check
Posted Sep 20, 2022
Authored by Jann Horn, Google Security Research

In the Linux Mali driver, when building with MALI_USE_CSF, the VFS read handler of the main Mali file descriptor (kbase_read()) never looks at its "count" parameter. This means that a simple userspace program that sets up a Mali file descriptor, then calls read(mali_fd, buf, 1), will see read() returning a higher length than requested, and out-of-bounds data in the userspace buffer will be clobbered.

tags | exploit
systems | linux
advisories | CVE-2022-36449
SHA-256 | 3d801b6f86d2cf6dcafab0fab084495a709669823b168ea8d4eaa15c04e2a64c
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