[PATCH] apparmor: Replace deprecated strcpy with memcpy in gen_symlink_name

[Thorsten Blum]

strcpy() is deprecated; use memcpy() instead. Unlike strcpy(), memcpy()
does not copy the NUL terminator from the source string, which would be
overwritten anyway on every iteration when using strcpy(). snprintf()
then ensures that 'char *s' is NUL-terminated.

Replace the hard-coded path length to remove the magic number 6, and add
a comment explaining the extra 11 bytes.

Link: https://github.com/KSPP/linux/issues/88
Signed-off-by: Thorsten Blum <thorsten.blum at linux.dev>
---
 security/apparmor/apparmorfs.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/security/apparmor/apparmorfs.c b/security/apparmor/apparmorfs.c
index 391a586d0557..4b2752200ce2 100644
--- a/security/apparmor/apparmorfs.c
+++ b/security/apparmor/apparmorfs.c
@@ -1602,16 +1602,20 @@ static char *gen_symlink_name(int depth, const char *dirname, const char *fname)
 {
 	char *buffer, *s;
 	int error;
-	int size = depth * 6 + strlen(dirname) + strlen(fname) + 11;
+	const char *path = "../../";
+	size_t path_len = strlen(path);
+	int size;
 
+	/* Extra 11 bytes: "raw_data" (9) + two slashes "//" (2) */
+	size = depth * path_len + strlen(dirname) + strlen(fname) + 11;
 	s = buffer = kmalloc(size, GFP_KERNEL);
 	if (!buffer)
 		return ERR_PTR(-ENOMEM);
 
 	for (; depth > 0; depth--) {
-		strcpy(s, "../../");
-		s += 6;
-		size -= 6;
+		memcpy(s, path, path_len);
+		s += path_len;
+		size -= path_len;
 	}
 
 	error = snprintf(s, size, "raw_data/%s/%s", dirname, fname);
-- 
2.51.0