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libbpf: Verify section type in btf_find_elf_sections

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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
This commit is contained in:
Ihor Solodrai
2025-04-10 11:28:23 -07:00
committed by Andrii Nakryiko
parent 806b4e0a9f
commit 02bc656f90
1 changed files with 6 additions and 0 deletions
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6
src/btf.c
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@@ -1148,6 +1148,12 @@ static int btf_find_elf_sections(Elf *elf, const char *path, struct btf_elf_secs
else else
continue; continue;
if (sh.sh_type != SHT_PROGBITS) {
pr_warn("unexpected section type (%d) of section(%d, %s) from %s\n",
sh.sh_type, idx, name, path);
goto err;
}
data = elf_getdata(scn, 0); data = elf_getdata(scn, 0);
if (!data) { if (!data) {
pr_warn("failed to get section(%d, %s) data from %s\n", pr_warn("failed to get section(%d, %s) data from %s\n",