Commit 62554d52 authored by Andrii Nakryiko's avatar Andrii Nakryiko Committed by Alexei Starovoitov

libbpf: Validate that .BTF and .BTF.ext sections contain data

.BTF and .BTF.ext ELF sections should have SHT_PROGBITS type and contain
data. If they are not, ELF is invalid or corrupted, so bail out.
Otherwise this can lead to data->d_buf being NULL and SIGSEGV later on.
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/20211103173213.1376990-4-andrii@kernel.org
parent 88918dc1
......@@ -3270,8 +3270,12 @@ static int bpf_object__elf_collect(struct bpf_object *obj)
} else if (strcmp(name, MAPS_ELF_SEC) == 0) {
obj->efile.btf_maps_shndx = idx;
} else if (strcmp(name, BTF_ELF_SEC) == 0) {
if (sh->sh_type != SHT_PROGBITS)
return -LIBBPF_ERRNO__FORMAT;
btf_data = data;
} else if (strcmp(name, BTF_EXT_ELF_SEC) == 0) {
if (sh->sh_type != SHT_PROGBITS)
return -LIBBPF_ERRNO__FORMAT;
btf_ext_data = data;
} else if (sh->sh_type == SHT_SYMTAB) {
/* already processed during the first pass above */
......
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