bpf: Ensure line_info.insn_off cannot point to insn with zero code

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This patch rejects a line_info if the bpf insn code referred by
line_info.insn_off is 0. F.e. a broken userspace tool might generate
a line_info.insn_off that points to the second 8 bytes of a BPF_LD_IMM64.

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Martin KaFai Lau 2018-12-19 13:01:01 -08:00 • committed by Alexei Starovoitov

parent 9e88b9312a

commit fdbaa0beb7

1 changed files with 8 additions and 0 deletions

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kernel/bpf/verifier.c

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