libbpf: Fix detection of BPF helper call instruction

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BPF_CALL | BPF_JMP32 is explicitly not allowed by verifier for BPF helper
calls, so don't detect it as a valid call. Also drop the check on func_id
pointer, as it's currently always non-null.

Fixes: 109cea5a59 ("libbpf: Sanitize BPF program code for bpf_probe_read_{kernel, user}[_str]")
Reported-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20200820061411.1755905-1-andriin@fb.com

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Andrii Nakryiko 2020-08-19 23:14:08 -07:00 • committed by Daniel Borkmann

parent 0bc23a1d1c

commit 9b2f6fecf3

1 changed files with 4 additions and 6 deletions

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tools/lib/bpf/libbpf.c

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