netdev - Re: [PATCH bpf-next] libbpf: fix off-by-one error in ELF sanity check

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Date:   Tue, 29 Oct 2019 03:29:00 +0000
From:   Alexei Starovoitov <ast@...com>
To:     Andrii Nakryiko <andriin@...com>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "daniel@...earbox.net" <daniel@...earbox.net>
CC:     "andrii.nakryiko@...il.com" <andrii.nakryiko@...il.com>,
        Kernel Team <Kernel-team@...com>
Subject: Re: [PATCH bpf-next] libbpf: fix off-by-one error in ELF sanity check

On 10/28/19 4:37 PM, Andrii Nakryiko wrote:
> libbpf's bpf_object__elf_collect() does simple sanity check after iterating
> over all ELF sections, if checks that .strtab index is correct. Unfortunately,
> due to section indices being 1-based, the check breaks for cases when .strtab
> ends up being the very last section in ELF.
> 
> Fixes: 77ba9a5b48a7 ("tools lib bpf: Fetch map names from correct strtab")
> Signed-off-by: Andrii Nakryiko <andriin@...com>

4 year old bug. Nice!
Applied. Thanks.