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bpf: Provide function to get vmlinux BTF information

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It will be used later for BPF structure display support

Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/1601292670-1616-2-git-send-email-alan.maguire@oracle.com
This commit is contained in:
Alan Maguire 2020-09-28 12:31:03 +01:00 committed by Alexei Starovoitov
parent a871b04310
commit 76654e67f3
2 changed files with 14 additions and 6 deletions
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2
include/linux/bpf.h
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@ -1364,6 +1364,8 @@ int bpf_check(struct bpf_prog **fp, union bpf_attr *attr,
union bpf_attr __user *uattr);
void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth);
struct btf *bpf_get_btf_vmlinux(void);
/* Map specifics */
struct xdp_buff;
struct sk_buff;

18
kernel/bpf/verifier.c
View File

@ -11533,6 +11533,17 @@ static int check_attach_btf_id(struct bpf_verifier_env *env)
return 0;
}
struct btf *bpf_get_btf_vmlinux(void)
{
if (!btf_vmlinux && IS_ENABLED(CONFIG_DEBUG_INFO_BTF)) {
mutex_lock(&bpf_verifier_lock);
if (!btf_vmlinux)
btf_vmlinux = btf_parse_vmlinux();
mutex_unlock(&bpf_verifier_lock);
}
return btf_vmlinux;
}
int bpf_check(struct bpf_prog **prog, union bpf_attr *attr,
union bpf_attr __user *uattr)
{
@ -11566,12 +11577,7 @@ int bpf_check(struct bpf_prog **prog, union bpf_attr *attr,
env->ops = bpf_verifier_ops[env->prog->type];
is_priv = bpf_capable();
if (!btf_vmlinux && IS_ENABLED(CONFIG_DEBUG_INFO_BTF)) {
mutex_lock(&bpf_verifier_lock);
if (!btf_vmlinux)
btf_vmlinux = btf_parse_vmlinux();
mutex_unlock(&bpf_verifier_lock);
}
bpf_get_btf_vmlinux();
/* grab the mutex to protect few globals used by verifier */
if (!is_priv)