netdev - Re: [PATCH net] bpf: fix out of bounds access in verifier log

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Message-ID: <55EF4C69.3010401@iogearbox.net>
Date:	Tue, 08 Sep 2015 23:00:25 +0200
From:	Daniel Borkmann <daniel@...earbox.net>
To:	Alexei Starovoitov <ast@...mgrid.com>,
	"David S. Miller" <davem@...emloft.net>
CC:	Yonghong Song <yhs@...mgrid.com>, netdev@...r.kernel.org
Subject: Re: [PATCH net] bpf: fix out of bounds access in verifier log

On 09/08/2015 10:40 PM, Alexei Starovoitov wrote:
> when the verifier log is enabled the print_bpf_insn() is doing
> bpf_alu_string[BPF_OP(insn->code) >> 4]
> and
> bpf_jmp_string[BPF_OP(insn->code) >> 4]
> where BPF_OP is a 4-bit instruction opcode.
> Malformed insns can cause out of bounds access.
> Fix it by sizing arrays appropriately.
>
> The bug was found by clang address sanitizer with libfuzzer.
>
> Reported-by: Yonghong Song <yhs@...mgrid.com>
> Signed-off-by: Alexei Starovoitov <ast@...mgrid.com>

Acked-by: Daniel Borkmann <daniel@...earbox.net>
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