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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: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20211103173213.1376990-4-andrii@kernel.org
This commit is contained in:
Andrii Nakryiko 2021-11-03 10:32:11 -07:00 committed by Alexei Starovoitov
parent 88918dc12d
commit 62554d52e7
1 changed files with 4 additions and 0 deletions
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4
tools/lib/bpf/libbpf.c
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@ -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 */