linux-kernel - [PATCH v2 3/6] tracing: Use copy_from_user_nul() instead of copy_from

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20260112073039.1185-4-fushuai.wang@linux.dev>
Date: Mon, 12 Jan 2026 15:30:36 +0800
From: Fushuai Wang <fushuai.wang@...ux.dev>
To: tglx@...nel.org,
	peterz@...radead.org,
	mathieu.desnoyers@...icios.com,
	akpm@...ux-foundation.org,
	aliceryhl@...gle.com,
	yury.norov@...il.com,
	vmalik@...hat.com,
	kees@...nel.org,
	dave.hansen@...ux.intel.com,
	luto@...nel.org,
	mingo@...hat.com,
	bp@...en8.de,
	hpa@...or.com,
	rostedt@...dmis.org,
	mhiramat@...nel.org,
	brauner@...nel.org,
	jack@...e.cz,
	cyphar@...har.com
Cc: linux-kernel@...r.kernel.org,
	x86@...nel.org,
	linux-trace-kernel@...r.kernel.org,
	wangfushuai@...du.com
Subject: [PATCH v2 3/6] tracing: Use copy_from_user_nul() instead of copy_from_user()

From: Fushuai Wang <wangfushuai@...du.com>

Use copy_from_user_nul() instead of copy_from_user() to simplify
the code.

No functional change.

Signed-off-by: Fushuai Wang <wangfushuai@...du.com>
---
 kernel/trace/trace.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index baec63134ab6..b6ffd006fcf9 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -11266,10 +11266,9 @@ ssize_t trace_parse_run_command(struct file *file, const char __user *buffer,
 		if (size >= WRITE_BUFSIZE)
 			size = WRITE_BUFSIZE - 1;
 
-		if (copy_from_user(kbuf, buffer + done, size))
+		if (copy_from_user_nul(kbuf, buffer + done, size))
 			return -EFAULT;
 
-		kbuf[size] = '\0';
 		buf = kbuf;
 		do {
 			tmp = strchr(buf, '\n');
-- 
2.36.1