Commit 83390787 authored by Andrii Nakryiko's avatar Andrii Nakryiko Committed by Alexei Starovoitov
Browse files

libbpf: Detect corrupted ELF symbols section 



Prevent divide-by-zero if ELF is corrupted and has zero sh_entsize.
Reported by oss-fuzz project.

Signed-off-by: default avatarAndrii Nakryiko <andrii@kernel.org>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
Acked-by: default avatarYonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20211103173213.1376990-2-andrii@kernel.org
parent 8388092b

tools/lib/bpf/libbpf.c

+1 −1
Original line number Diff line number Diff line
@@ -3555,7 +3555,7 @@ static int bpf_object__collect_externs(struct bpf_object *obj) 


	scn = elf_sec_by_idx(obj, obj->efile.symbols_shndx);

	sh = elf_sec_hdr(obj, scn);

	if (!sh)

	if (!sh || sh->sh_entsize != sizeof(Elf64_Sym))

		return -LIBBPF_ERRNO__FORMAT;



	dummy_var_btf_id = add_dummy_ksym_var(obj->btf);