libbpf: avoid overflow in BTF.ext bounds check - #8690
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libbpf: avoid overflow in BTF.ext bounds check#8690kernel-patches-daemon-bpf-rc[bot] wants to merge 1 commit into
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An invalid BTF.ext subsection length can wrap the pointer addition used by btf_ext_parse_sec_info() on 32-bit builds. The wrapped pointer passes the bounds check and parsing then reads beyond the copied BTF.ext data. Validate the offset and length with subtraction before forming the section pointer. Add a selftest using an overflowing func_info_len. Fixes: cf57916 ("libbpf: Support BTF.ext loading and output in either endianness") Closes: https://issues.oss-fuzz.com/issues/477315119 Signed-off-by: Darren Carreras <carrerasdarren@gmail.com>
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Upstream branch: d114bb9 |
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Pull request for series with
subject: libbpf: avoid overflow in BTF.ext bounds check
version: 3
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=1143651