mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-05-19 08:11:11 -04:00
d2749ae85a
Add a trivial test case asserting that the BPF verifier enforces PTR_MAYBE_NULL semantics on the struct file pointer argument of BPF LSM hook bpf_lsm_mmap_file(). Dereferencing the struct file pointer passed into bpf_lsm_mmap_file() without explicitly performing a NULL check first should not be permitted by the BPF verifier as it can lead to NULL pointer dereferences and a kernel crash. Signed-off-by: Matt Bobrowski <mattbobrowski@google.com> Acked-by: Song Liu <song@kernel.org> Link: https://lore.kernel.org/r/20251216133000.3690723-2-mattbobrowski@google.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>