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Message-Id: <1587120160-3030-2-git-send-email-alan.maguire@oracle.com>
Date: Fri, 17 Apr 2020 11:42:35 +0100
From: Alan Maguire <alan.maguire@...cle.com>
To: ast@...nel.org, daniel@...earbox.net, yhs@...com
Cc: kafai@...com, songliubraving@...com, andriin@...com,
john.fastabend@...il.com, kpsingh@...omium.org,
linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
bpf@...r.kernel.org, Alan Maguire <alan.maguire@...cle.com>
Subject: [RFC PATCH bpf-next 1/6] bpf: provide function to get vmlinux BTF information
It will be used later for BTF printk() support
Signed-off-by: Alan Maguire <alan.maguire@...cle.com>
---
include/linux/bpf.h | 2 ++
kernel/bpf/verifier.c | 18 ++++++++++++------
2 files changed, 14 insertions(+), 6 deletions(-)
diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index 40c5392..47d0fcd 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -1123,6 +1123,8 @@ 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;
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index ae32517..87251fa 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -10039,6 +10039,17 @@ static int check_attach_btf_id(struct bpf_verifier_env *env)
}
}
+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)
{
@@ -10072,12 +10083,7 @@ int bpf_check(struct bpf_prog **prog, union bpf_attr *attr,
env->ops = bpf_verifier_ops[env->prog->type];
is_priv = capable(CAP_SYS_ADMIN);
- 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)
--
1.8.3.1
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