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Message-ID: <20260106165907.53631-6-leon.hwang@linux.dev>
Date: Wed, 7 Jan 2026 00:59:03 +0800
From: Leon Hwang <leon.hwang@...ux.dev>
To: bpf@...r.kernel.org
Cc: Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Andrii Nakryiko <andrii@...nel.org>,
Martin KaFai Lau <martin.lau@...ux.dev>,
Eduard Zingerman <eddyz87@...il.com>,
Song Liu <song@...nel.org>,
Yonghong Song <yonghong.song@...ux.dev>,
John Fastabend <john.fastabend@...il.com>,
KP Singh <kpsingh@...nel.org>,
Stanislav Fomichev <sdf@...ichev.me>,
Hao Luo <haoluo@...gle.com>,
Jiri Olsa <jolsa@...nel.org>,
Shuah Khan <shuah@...nel.org>,
Christian Brauner <brauner@...nel.org>,
Oleg Nesterov <oleg@...hat.com>,
Leon Hwang <leon.hwang@...ux.dev>,
Seth Forshee <sforshee@...nel.org>,
Yuichiro Tsuji <yuichtsu@...zon.com>,
Andrey Albershteyn <aalbersh@...hat.com>,
Willem de Bruijn <willemb@...gle.com>,
Jason Xing <kerneljasonxing@...il.com>,
Paul Chaignon <paul.chaignon@...il.com>,
Mykyta Yatsenko <yatsenko@...a.com>,
Kumar Kartikeya Dwivedi <memxor@...il.com>,
Anton Protopopov <a.s.protopopov@...il.com>,
Amery Hung <ameryhung@...il.com>,
Rong Tao <rongtao@...tc.cn>,
linux-kernel@...r.kernel.org,
linux-api@...r.kernel.org,
linux-kselftest@...r.kernel.org,
kernel-patches-bot@...com
Subject: [PATCH bpf-next v4 5/9] bpf: Refactor reporting btf_log_true_size for btf_load
In the next commit, it will be able to report logs via extended common
attributes, which will report 'log_true_size' via the extended common
attributes meanwhile.
Therefore, refactor the way of 'btf_log_true_size' reporting in order to
report 'log_true_size' via the extended common attributes easily.
Signed-off-by: Leon Hwang <leon.hwang@...ux.dev>
---
include/linux/btf.h | 2 +-
kernel/bpf/btf.c | 25 +++++--------------------
kernel/bpf/syscall.c | 19 ++++++++++++++++---
3 files changed, 22 insertions(+), 24 deletions(-)
diff --git a/include/linux/btf.h b/include/linux/btf.h
index 691f09784933..2b27fdd567f5 100644
--- a/include/linux/btf.h
+++ b/include/linux/btf.h
@@ -144,7 +144,7 @@ const char *btf_get_name(const struct btf *btf);
void btf_get(struct btf *btf);
void btf_put(struct btf *btf);
const struct btf_header *btf_header(const struct btf *btf);
-int btf_new_fd(const union bpf_attr *attr, bpfptr_t uattr, u32 uattr_sz);
+int btf_new_fd(union bpf_attr *attr, bpfptr_t uattr);
struct btf *btf_get_by_fd(int fd);
int btf_get_info_by_fd(const struct btf *btf,
const union bpf_attr *attr,
diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index 539c9fdea41d..9efcbb489edb 100644
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -5745,22 +5745,7 @@ static int btf_check_type_tags(struct btf_verifier_env *env,
return 0;
}
-static int finalize_log(struct bpf_verifier_log *log, bpfptr_t uattr, u32 uattr_size)
-{
- u32 log_true_size;
- int err;
-
- err = bpf_vlog_finalize(log, &log_true_size);
-
- if (uattr_size >= offsetofend(union bpf_attr, btf_log_true_size) &&
- copy_to_bpfptr_offset(uattr, offsetof(union bpf_attr, btf_log_true_size),
- &log_true_size, sizeof(log_true_size)))
- err = -EFAULT;
-
- return err;
-}
-
-static struct btf *btf_parse(const union bpf_attr *attr, bpfptr_t uattr, u32 uattr_size)
+static struct btf *btf_parse(union bpf_attr *attr, bpfptr_t uattr)
{
bpfptr_t btf_data = make_bpfptr(attr->btf, uattr.is_kernel);
char __user *log_ubuf = u64_to_user_ptr(attr->btf_log_buf);
@@ -5841,7 +5826,7 @@ static struct btf *btf_parse(const union bpf_attr *attr, bpfptr_t uattr, u32 uat
}
}
- err = finalize_log(&env->log, uattr, uattr_size);
+ err = bpf_vlog_finalize(&env->log, &attr->btf_log_true_size);
if (err)
goto errout_free;
@@ -5853,7 +5838,7 @@ static struct btf *btf_parse(const union bpf_attr *attr, bpfptr_t uattr, u32 uat
btf_free_struct_meta_tab(btf);
errout:
/* overwrite err with -ENOSPC or -EFAULT */
- ret = finalize_log(&env->log, uattr, uattr_size);
+ ret = bpf_vlog_finalize(&env->log, &attr->btf_log_true_size);
if (ret)
err = ret;
errout_free:
@@ -8017,12 +8002,12 @@ static int __btf_new_fd(struct btf *btf)
return anon_inode_getfd("btf", &btf_fops, btf, O_RDONLY | O_CLOEXEC);
}
-int btf_new_fd(const union bpf_attr *attr, bpfptr_t uattr, u32 uattr_size)
+int btf_new_fd(union bpf_attr *attr, bpfptr_t uattr)
{
struct btf *btf;
int ret;
- btf = btf_parse(attr, uattr, uattr_size);
+ btf = btf_parse(attr, uattr);
if (IS_ERR(btf))
return PTR_ERR(btf);
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index ad565f569a4f..ce349a059d5d 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -5422,7 +5422,7 @@ static int bpf_obj_get_info_by_fd(const union bpf_attr *attr,
#define BPF_BTF_LOAD_LAST_FIELD btf_token_fd
-static int bpf_btf_load(const union bpf_attr *attr, bpfptr_t uattr, __u32 uattr_size)
+static int bpf_btf_load(union bpf_attr *attr, bpfptr_t uattr)
{
struct bpf_token *token = NULL;
@@ -5449,7 +5449,7 @@ static int bpf_btf_load(const union bpf_attr *attr, bpfptr_t uattr, __u32 uattr_
bpf_token_put(token);
- return btf_new_fd(attr, uattr, uattr_size);
+ return btf_new_fd(attr, uattr);
}
#define BPF_BTF_GET_FD_BY_ID_LAST_FIELD fd_by_id_token_fd
@@ -6211,6 +6211,16 @@ static int copy_prog_load_log_true_size(union bpf_attr *attr, bpfptr_t uattr, un
&attr->log_true_size);
}
+static int copy_btf_load_log_true_size(union bpf_attr *attr, bpfptr_t uattr, unsigned int size)
+{
+ if (size >= offsetofend(union bpf_attr, btf_log_true_size) &&
+ copy_to_bpfptr_offset(uattr, offsetof(union bpf_attr, btf_log_true_size),
+ &attr->btf_log_true_size, sizeof(attr->btf_log_true_size)))
+ return -EFAULT;
+
+ return 0;
+}
+
static int __sys_bpf(enum bpf_cmd cmd, bpfptr_t uattr, unsigned int size,
bpfptr_t uattr_common, unsigned int size_common)
{
@@ -6318,7 +6328,10 @@ static int __sys_bpf(enum bpf_cmd cmd, bpfptr_t uattr, unsigned int size,
err = bpf_raw_tracepoint_open(&attr);
break;
case BPF_BTF_LOAD:
- err = bpf_btf_load(&attr, uattr, size);
+ attr.btf_log_true_size = 0;
+ err = bpf_btf_load(&attr, uattr);
+ ret = copy_btf_load_log_true_size(&attr, uattr, size);
+ err = ret ? ret : err;
break;
case BPF_BTF_GET_FD_BY_ID:
err = bpf_btf_get_fd_by_id(&attr);
--
2.52.0
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