diff options
| author | Andrii Nakryiko <andrii@kernel.org> | 2021-04-23 11:13:34 -0700 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2021-04-23 14:05:26 -0700 |
| commit | aea28a602fa19fb4fe66374030ab7e2c8ddf643e (patch) | |
| tree | 044aaf22b476bf1e16840f21a1a34eb996eed748 /tools/lib/bpf/libbpf_internal.h | |
| parent | 0fec7a3cee1cf8e4f86ff563d229408ccbdc2d66 (diff) | |
libbpf: Mark BPF subprogs with hidden visibility as static for BPF verifier
Define __hidden helper macro in bpf_helpers.h, which is a short-hand for
__attribute__((visibility("hidden"))). Add libbpf support to mark BPF
subprograms marked with __hidden as static in BTF information to enforce BPF
verifier's static function validation algorithm, which takes more information
(caller's context) into account during a subprogram validation.
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/20210423181348.1801389-5-andrii@kernel.org
Diffstat (limited to 'tools/lib/bpf/libbpf_internal.h')
| -rw-r--r-- | tools/lib/bpf/libbpf_internal.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/tools/lib/bpf/libbpf_internal.h b/tools/lib/bpf/libbpf_internal.h index 6017902c687e..92b7eae10c6d 100644 --- a/tools/lib/bpf/libbpf_internal.h +++ b/tools/lib/bpf/libbpf_internal.h @@ -19,6 +19,7 @@ #pragma GCC poison reallocarray #include "libbpf.h" +#include "btf.h" #ifndef EM_BPF #define EM_BPF 247 @@ -132,6 +133,11 @@ struct btf_type; struct btf_type *btf_type_by_id(struct btf *btf, __u32 type_id); +static inline __u32 btf_type_info(int kind, int vlen, int kflag) +{ + return (kflag << 31) | (kind << 24) | vlen; +} + void *libbpf_add_mem(void **data, size_t *cap_cnt, size_t elem_sz, size_t cur_cnt, size_t max_cnt, size_t add_cnt); int libbpf_ensure_mem(void **data, size_t *cap_cnt, size_t elem_sz, size_t need_cnt); |