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

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Date:   Wed, 28 Dec 2022 09:36:54 +0800 (CST)
From:   <yang.yang29@....com.cn>
To:     <code@...icks.com>
Cc:     <ira.weiny@...el.com>, <fmdefrancesco@...il.com>,
        <ecryptfs@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <xu.panda@....com.cn>, <yang.yang29@....com.cn>
Subject: [PATCH linux-next] ecryptfs: crypto: 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>
---
 fs/ecryptfs/crypto.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c
index 03263ebcccc6..c618a6878584 100644
--- a/fs/ecryptfs/crypto.c
+++ b/fs/ecryptfs/crypto.c
@@ -1630,9 +1630,8 @@ ecryptfs_add_new_key_tfm(struct ecryptfs_key_tfm **key_tfm, char *cipher_name,
 		goto out;
 	}
 	mutex_init(&tmp_tfm->key_tfm_mutex);
-	strncpy(tmp_tfm->cipher_name, cipher_name,
-		ECRYPTFS_MAX_CIPHER_NAME_SIZE);
-	tmp_tfm->cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE] = '\0';
+	strscpy(tmp_tfm->cipher_name, cipher_name,
+		ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1);
 	tmp_tfm->key_size = key_size;
 	rc = ecryptfs_process_key_cipher(&tmp_tfm->key_tfm,
 					 tmp_tfm->cipher_name,
-- 
2.15.2