bpf: Limit bpf program signature size

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Practical BPF signatures are significantly smaller than
KMALLOC_MAX_CACHE_SIZE

Allowing larger sizes opens the door for abuse by passing excessive
size values and forcing the kernel into expensive allocation paths (via
kmalloc_large or vmalloc).

Fixes: 3492715683 ("bpf: Implement signature verification for BPF programs")
Reported-by: Chris Mason <clm@meta.com>
Signed-off-by: KP Singh <kpsingh@kernel.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/r/20260205063807.690823-1-kpsingh@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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KP Singh 2026-02-05 07:38:07 +01:00 • committed by Alexei Starovoitov

parent 75cd3beb64

commit ea1535e28b

1 changed files with 7 additions and 0 deletions

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kernel/bpf/syscall.c

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