diff options
| author | Alexei Starovoitov <ast@kernel.org> | 2019-10-15 20:24:57 -0700 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2019-10-17 16:44:35 +0200 |
| commit | 8580ac9404f6240668a026785d7d8856f0530409 (patch) | |
| tree | 2858fc3bdfcb0d3de7bcb1eede0cabf3dcc6a89e /include/linux/btf.h | |
| parent | 7c6a469e3416fa23568c2395a3faa7dd6e376dcb (diff) | |
bpf: Process in-kernel BTF
If in-kernel BTF exists parse it and prepare 'struct btf *btf_vmlinux'
for further use by the verifier.
In-kernel BTF is trusted just like kallsyms and other build artifacts
embedded into vmlinux.
Yet run this BTF image through BTF verifier to make sure
that it is valid and it wasn't mangled during the build.
If in-kernel BTF is incorrect it means either gcc or pahole or kernel
are buggy. In such case disallow loading BPF programs.
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20191016032505.2089704-4-ast@kernel.org
Diffstat (limited to 'include/linux/btf.h')
| -rw-r--r-- | include/linux/btf.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/btf.h b/include/linux/btf.h index 64cdf2a23d42..55d43bc856be 100644 --- a/include/linux/btf.h +++ b/include/linux/btf.h @@ -56,6 +56,7 @@ bool btf_type_is_void(const struct btf_type *t); #ifdef CONFIG_BPF_SYSCALL const struct btf_type *btf_type_by_id(const struct btf *btf, u32 type_id); const char *btf_name_by_offset(const struct btf *btf, u32 offset); +struct btf *btf_parse_vmlinux(void); #else static inline const struct btf_type *btf_type_by_id(const struct btf *btf, u32 type_id) |