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authorAlexei Starovoitov <ast@kernel.org>2019-10-15 20:24:57 -0700
committerDaniel Borkmann <daniel@iogearbox.net>2019-10-17 16:44:35 +0200
commit8580ac9404f6240668a026785d7d8856f0530409 (patch)
tree2858fc3bdfcb0d3de7bcb1eede0cabf3dcc6a89e /include/linux/btf.h
parent7c6a469e3416fa23568c2395a3faa7dd6e376dcb (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.h1
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)