From: Yafang Shao <laoar.shao@gmail.com>
To: ast@kernel.org, daniel@iogearbox.net, john.fastabend@gmail.com,
andrii@kernel.org, martin.lau@linux.dev, song@kernel.org,
yhs@fb.com, kpsingh@kernel.org, sdf@google.com,
haoluo@google.com, jolsa@kernel.org, quentin@isovalent.com,
rostedt@goodmis.org, mhiramat@kernel.org
Cc: bpf@vger.kernel.org, linux-trace-kernel@vger.kernel.org,
Yafang Shao <laoar.shao@gmail.com>
Subject: [PATCH v3 bpf-next 07/10] bpf: Add a common helper bpf_copy_to_user()
Date: Mon, 12 Jun 2023 15:16:05 +0000 [thread overview]
Message-ID: <20230612151608.99661-8-laoar.shao@gmail.com> (raw)
In-Reply-To: <20230612151608.99661-1-laoar.shao@gmail.com>
Add a common helper bpf_copy_to_user(), which will be used at multiple
places.
No functional change.
Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
---
kernel/bpf/syscall.c | 34 ++++++++++++++++++++--------------
1 file changed, 20 insertions(+), 14 deletions(-)
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 92a57ef..80c9ec0 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -3234,6 +3234,25 @@ static void bpf_raw_tp_link_show_fdinfo(const struct bpf_link *link,
raw_tp_link->btp->tp->name);
}
+static int bpf_copy_to_user(char __user *ubuf, const char *buf, u32 ulen,
+ u32 len)
+{
+ if (ulen >= len + 1) {
+ if (copy_to_user(ubuf, buf, len + 1))
+ return -EFAULT;
+ } else {
+ char zero = '\0';
+
+ if (copy_to_user(ubuf, buf, ulen - 1))
+ return -EFAULT;
+ if (put_user(zero, ubuf + ulen - 1))
+ return -EFAULT;
+ return -ENOSPC;
+ }
+
+ return 0;
+}
+
static int bpf_raw_tp_link_fill_link_info(const struct bpf_link *link,
struct bpf_link_info *info)
{
@@ -3252,20 +3271,7 @@ static int bpf_raw_tp_link_fill_link_info(const struct bpf_link *link,
if (!ubuf)
return 0;
- if (ulen >= tp_len + 1) {
- if (copy_to_user(ubuf, tp_name, tp_len + 1))
- return -EFAULT;
- } else {
- char zero = '\0';
-
- if (copy_to_user(ubuf, tp_name, ulen - 1))
- return -EFAULT;
- if (put_user(zero, ubuf + ulen - 1))
- return -EFAULT;
- return -ENOSPC;
- }
-
- return 0;
+ return bpf_copy_to_user(ubuf, tp_name, ulen, tp_len);
}
static const struct bpf_link_ops bpf_raw_tp_link_lops = {
--
1.8.3.1
next prev parent reply other threads:[~2023-06-12 15:16 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-12 15:15 [PATCH v3 bpf-next 00/10] bpf: Support ->fill_link_info for kprobe_multi and perf_event links Yafang Shao
2023-06-12 15:15 ` [PATCH v3 bpf-next 01/10] bpf: Support ->fill_link_info for kprobe_multi Yafang Shao
2023-06-15 8:29 ` Jiri Olsa
2023-06-15 12:09 ` Yafang Shao
2023-06-16 17:24 ` Andrii Nakryiko
2023-06-17 2:48 ` Yafang Shao
2023-06-12 15:16 ` [PATCH v3 bpf-next 02/10] bpftool: Dump the kernel symbol's module name Yafang Shao
2023-06-13 13:41 ` Quentin Monnet
2023-06-13 14:56 ` Yafang Shao
2023-06-16 17:25 ` Andrii Nakryiko
2023-06-17 2:55 ` Yafang Shao
2023-06-12 15:16 ` [PATCH v3 bpf-next 03/10] bpftool: Show probed function in kprobe_multi link info Yafang Shao
2023-06-13 13:41 ` Quentin Monnet
2023-06-13 14:59 ` Yafang Shao
2023-06-13 22:36 ` Kui-Feng Lee
2023-06-14 2:42 ` Yafang Shao
2023-06-14 8:33 ` Quentin Monnet
2023-06-16 17:30 ` Andrii Nakryiko
2023-06-17 3:08 ` Yafang Shao
2023-06-20 17:17 ` Andrii Nakryiko
2023-06-21 1:29 ` Yafang Shao
2023-06-12 15:16 ` [PATCH v3 bpf-next 04/10] bpf: Protect probed address based on kptr_restrict setting Yafang Shao
2023-06-12 15:16 ` [PATCH v3 bpf-next 05/10] bpf: Clear the probe_addr for uprobe Yafang Shao
2023-06-12 17:22 ` Yonghong Song
2023-06-12 15:16 ` [PATCH v3 bpf-next 06/10] bpf: Expose symbol's respective address Yafang Shao
2023-06-12 15:16 ` Yafang Shao [this message]
2023-06-12 15:16 ` [PATCH v3 bpf-next 08/10] bpf: Support ->fill_link_info for perf_event Yafang Shao
2023-06-12 17:36 ` Yonghong Song
2023-06-13 2:47 ` Yafang Shao
2023-06-14 2:34 ` Kui-Feng Lee
2023-06-14 2:45 ` Yafang Shao
2023-06-16 20:36 ` Andrii Nakryiko
2023-06-17 3:13 ` Yafang Shao
2023-06-15 10:21 ` Jiri Olsa
2023-06-15 12:10 ` Yafang Shao
2023-06-12 15:16 ` [PATCH v3 bpf-next 09/10] bpftool: Add perf event names Yafang Shao
2023-06-13 13:41 ` Quentin Monnet
2023-06-13 15:01 ` Yafang Shao
2023-06-15 10:23 ` Jiri Olsa
2023-06-12 15:16 ` [PATCH v3 bpf-next 10/10] bpftool: Show probed function in perf_event link info Yafang Shao
2023-06-13 13:42 ` Quentin Monnet
2023-06-13 15:11 ` Yafang Shao
2023-06-16 20:41 ` Andrii Nakryiko
2023-06-17 3:20 ` Yafang Shao
2023-06-17 3:29 ` Yafang Shao
2023-06-15 10:04 ` [PATCH v3 bpf-next 00/10] bpf: Support ->fill_link_info for kprobe_multi and perf_event links Jiri Olsa
2023-06-15 12:09 ` Yafang Shao
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