From: Wan Jiabing <[email protected]>
To: Steven Rostedt <[email protected]>,
Ingo Molnar <[email protected]>,
Alexei Starovoitov <[email protected]>,
Daniel Borkmann <[email protected]>,
Andrii Nakryiko <[email protected]>,
Martin KaFai Lau <[email protected]>, Song Liu <[email protected]>,
Yonghong Song <[email protected]>,
John Fastabend <[email protected]>,
KP Singh <[email protected]>,
[email protected], [email protected],
[email protected]
Cc: Wan Jiabing <[email protected]>
Subject: [PATCH 3/3] bpf: use vmemdup_user instead of kvmalloc and copy_from_user
Date: Thu, 12 May 2022 22:17:10 +0800 [thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
Fix following coccicheck warning:
./kernel/trace/bpf_trace.c:2488:12-20: WARNING opportunity for vmemdup_user
Use vmemdup_user instead of kvmalloc and copy_from_user.
Signed-off-by: Wan Jiabing <[email protected]>
---
kernel/trace/bpf_trace.c | 10 +++-------
1 file changed, 3 insertions(+), 7 deletions(-)
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index 1b0db8f78dc8..48fc97a6db50 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -2483,15 +2483,11 @@ int bpf_kprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *pr
ucookies = u64_to_user_ptr(attr->link_create.kprobe_multi.cookies);
if (ucookies) {
- cookies = kvmalloc(size, GFP_KERNEL);
- if (!cookies) {
- err = -ENOMEM;
+ cookies = vmemdup_user(ucookies, size);
+ if (IS_ERR(cookies)) {
+ err = PTR_ERR(cookies);
goto error_addrs;
}
- if (copy_from_user(cookies, ucookies, size)) {
- err = -EFAULT;
- goto error_cookies;
- }
}
link = kzalloc(sizeof(*link), GFP_KERNEL);
--
2.35.1
next prev parent reply other threads:[~2022-05-12 14:18 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-12 14:17 [PATCH 0/3] bpf: optimize the bpf_kprobe_multi_link_attach function Wan Jiabing
2022-05-12 14:17 ` [PATCH 1/3] bpf: use 'error_xxx' tags in bpf_kprobe_multi_link_attach Wan Jiabing
2022-05-12 16:40 ` Song Liu
2022-05-12 17:05 ` David Vernet
2022-05-12 14:17 ` [PATCH 2/3] bpf: simplify if-if to if " Wan Jiabing
2022-05-12 16:44 ` Song Liu
2022-05-12 14:17 ` Wan Jiabing [this message]
2022-05-12 16:45 ` [PATCH 3/3] bpf: use vmemdup_user instead of kvmalloc and copy_from_user Song Liu
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox