linux-kernel - [PATCH linux-next] blktrace: use strscpy() to instead of strncpy()

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Date:   Thu, 5 Jan 2023 20:16:13 +0800 (CST)
From:   <yang.yang29@....com.cn>
To:     <axboe@...nel.dk>
Cc:     <rostedt@...dmis.org>, <mhiramat@...nel.org>,
        <linux-block@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-trace-kernel@...r.kernel.org>, <xu.panda@....com.cn>,
        <yang.yang29@....com.cn>
Subject: [PATCH linux-next] blktrace: use strscpy() to instead of strncpy()

From: Xu Panda <xu.panda@....com.cn>

The implementation of strscpy() is more robust and safer.
That's now the recommended way to copy NUL-terminated strings.

Signed-off-by: Xu Panda <xu.panda@....com.cn>
Signed-off-by: Yang Yang <yang.yang29@....com.cn>
---
 kernel/trace/blktrace.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 918a7d12df8f..ff0cc68d7667 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -524,8 +524,7 @@ static int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
 	if (!buts->buf_size || !buts->buf_nr)
 		return -EINVAL;

-	strncpy(buts->name, name, BLKTRACE_BDEV_SIZE);
-	buts->name[BLKTRACE_BDEV_SIZE - 1] = '\0';
+	strscpy(buts->name, name, BLKTRACE_BDEV_SIZE);

 	/*
 	 * some device names have larger paths - convert the slashes
-- 
2.15.2