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| author |   Andrii Nakryiko <andrii@kernel.org> | 2021-11-23 16:23:14 -0800 |
|---|---|---|
| committer |   Daniel Borkmann <daniel@iogearbox.net> | 2021-11-26 00:14:06 +0100 |
| commit | 401891a9debaf0a684502f2aaecf53448cee9414 (patch) | |
| tree | 0aa7859715d0c72758e24fe0d0665f5adad02528 /tools/lib/bpf/btf.h | |
| parent | tools/resolve_btf_ids: Close ELF file on error (diff) | |
| download | linux-401891a9debaf0a684502f2aaecf53448cee9414.tar.xz linux-401891a9debaf0a684502f2aaecf53448cee9414.zip | |
libbpf: Fix potential misaligned memory access in btf_ext__new()
Perform a memory copy before we do the sanity checks of btf_ext_hdr.
This prevents misaligned memory access if raw btf_ext data is not 4-byte
aligned ([0]).
While at it, also add missing const qualifier.
[0] Closes: https://github.com/libbpf/libbpf/issues/391
Fixes: 2993e0515bb4 ("tools/bpf: add support to read .BTF.ext sections")
Reported-by: Evgeny Vereshchagin <evvers@ya.ru>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20211124002325.1737739-3-andrii@kernel.org
Diffstat (limited to 'tools/lib/bpf/btf.h')
| -rw-r--r-- | tools/lib/bpf/btf.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/lib/bpf/btf.h b/tools/lib/bpf/btf.h index 5c73a5b0a044..742a2bf71c5e 100644 --- a/tools/lib/bpf/btf.h +++ b/tools/lib/bpf/btf.h @@ -157,7 +157,7 @@ LIBBPF_API int btf__get_map_kv_tids(const struct btf *btf, const char *map_name, __u32 expected_value_size, __u32 *key_type_id, __u32 *value_type_id); -LIBBPF_API struct btf_ext *btf_ext__new(__u8 *data, __u32 size); +LIBBPF_API struct btf_ext *btf_ext__new(const __u8 *data, __u32 size); LIBBPF_API void btf_ext__free(struct btf_ext *btf_ext); LIBBPF_API const void *btf_ext__get_raw_data(const struct btf_ext *btf_ext, __u32 *size); |