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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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5
src/btf.c
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@@ -1605,11 +1605,6 @@ static void *btf_add_type_mem(struct btf *btf, size_t add_sz)
btf->hdr->type_len, UINT_MAX, add_sz);
}
static __u32 btf_type_info(int kind, int vlen, int kflag)
{
return (kflag << 31) | (kind << 24) | vlen;
}
static void btf_type_inc_vlen(struct btf_type *t)
{
t->info = btf_type_info(btf_kind(t), btf_vlen(t) + 1, btf_kflag(t));