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libbpf: Verify section type in btf_find_elf_sections
authorIhor Solodrai <ihor.solodrai@linux.dev>
Thu, 10 Apr 2025 18:28:23 +0000 (11:28 -0700)
committerAndrii Nakryiko <andrii@kernel.org>
Tue, 15 Apr 2025 22:18:55 +0000 (15:18 -0700)
commit8582d9ab3efdebb88e0cd8beed8e0b9de76443e7
treec44084c599af3f4a9474658b418951506c2e6a4a
parentee684de5c1b0ac01821320826baec7da93f3615b
libbpf: Verify section type in btf_find_elf_sections

A valid ELF file may contain a SHT_NOBITS .BTF section. This case is
not handled correctly in btf_parse_elf, which leads to a segfault.

Before attempting to load BTF section data, check that the section
type is SHT_PROGBITS, which is the expected type for BTF data.  Fail
with an error if the type is different.

Bug report: https://github.com/libbpf/libbpf/issues/894
v1: https://lore.kernel.org/bpf/20250408184104.3962949-1-ihor.solodrai@linux.dev/

Signed-off-by: Ihor Solodrai <ihor.solodrai@linux.dev>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20250410182823.1591681-1-ihor.solodrai@linux.dev
tools/lib/bpf/btf.c