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libbpf: Mark BPF subprogs with hidden visibility as static for BPF verifier

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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
This commit is contained in:
Andrii Nakryiko
2021-04-23 11:13:34 -07:00
committed by Andrii Nakryiko
parent 2e430712f5
commit 3319982d34
4 changed files with 58 additions and 6 deletions
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6
src/libbpf_internal.h
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@@ -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);