From: Thorsten Blum <thorsten.blum@linux.dev>
Date: Sat, 12 Jul 2025 17:45:17 +0000 (+0200)
Subject: mm/memfd: replace deprecated strcpy() with memcpy() in alloc_name()
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5bd88fef6a0858bc80723de2e63168965054705d;p=thirdparty%2Flinux.git

mm/memfd: replace deprecated strcpy() with memcpy() in alloc_name()

strcpy() is deprecated; use memcpy() instead.

Not copying the NUL terminator is safe because strncpy_from_user() would
overwrite it anyway by appending uname to the destination buffer at index
MFD_NAME_PREFIX_LEN.

No functional changes intended.

Link: https://github.com/KSPP/linux/issues/88
Link: https://lkml.kernel.org/r/20250712174516.64243-2-thorsten.blum@linux.dev
Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/mm/memfd.c b/mm/memfd.c
index 32fa6bfe57d11..bbe679895ef6a 100644
--- a/mm/memfd.c
+++ b/mm/memfd.c
@@ -411,7 +411,7 @@ static char *alloc_name(const char __user *uname)
 	if (!name)
 		return ERR_PTR(-ENOMEM);
 
-	strcpy(name, MFD_NAME_PREFIX);
+	memcpy(name, MFD_NAME_PREFIX, MFD_NAME_PREFIX_LEN);
 	/* returned length does not include terminating zero */
 	len = strncpy_from_user(&name[MFD_NAME_PREFIX_LEN], uname, MFD_NAME_MAX_LEN + 1);
 	if (len < 0) {