fanotify: replace deprecated strcpy in fanotify_info_copy_{name,name2}

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 <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jan Kara <[email protected]>

Author: toblux

fs/notify/fanotify/fanotify.h

@@ -2,6 +2,7 @@
 #include <linux/fsnotify_backend.h>
 #include <linux/path.h>
 #include <linux/slab.h>
+#include <linux/string.h>
 #include <linux/exportfs.h>
 #include <linux/hashtable.h>
 
@@ -218,7 +219,7 @@ static inline void fanotify_info_copy_name(struct fanotify_info *info,
 		return;
 
 	info->name_len = name->len;
-	strcpy(fanotify_info_name(info), name->name);
+	strscpy(fanotify_info_name(info), name->name, name->len + 1);
 }
 
 static inline void fanotify_info_copy_name2(struct fanotify_info *info,
@@ -228,7 +229,7 @@ static inline void fanotify_info_copy_name2(struct fanotify_info *info,
 		return;
 
 	info->name2_len = name->len;
-	strcpy(fanotify_info_name2(info), name->name);
+	strscpy(fanotify_info_name2(info), name->name, name->len + 1);
 }
 
 /*