ecryptfs: Replace strcpy with strscpy in ecryptfs_set_default_crypt_stat_vals

strcpy() has been deprecated [1] because it performs no bounds checking
on the destination buffer, which can lead to buffer overflows. Replace
it with the safer strscpy().

Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strcpy [1]
Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Signed-off-by: Tyler Hicks <code@tyhicks.com>

Author: toblux

fs/ecryptfs/crypto.c

@@ -20,6 +20,7 @@
 #include <linux/file.h>
 #include <linux/scatterlist.h>
 #include <linux/slab.h>
+#include <linux/string.h>
 #include <linux/unaligned.h>
 #include <linux/kernel.h>
 #include <linux/xattr.h>
@@ -645,7 +646,7 @@ static void ecryptfs_set_default_crypt_stat_vals(
 	ecryptfs_copy_mount_wide_flags_to_inode_flags(crypt_stat,
 						      mount_crypt_stat);
 	ecryptfs_set_default_sizes(crypt_stat);
-	strcpy(crypt_stat->cipher, ECRYPTFS_DEFAULT_CIPHER);
+	strscpy(crypt_stat->cipher, ECRYPTFS_DEFAULT_CIPHER);
 	crypt_stat->key_size = ECRYPTFS_DEFAULT_KEY_BYTES;
 	crypt_stat->flags &= ~(ECRYPTFS_KEY_VALID);
 	crypt_stat->file_version = ECRYPTFS_FILE_VERSION;