luad

commit 262fc6437c1f1ca2c1bb08da00d9ff8b5ed54efd
parent 9569ba3cfa0614ffd9921de81144604e5f343ccb
Author: Daniel Barlow <dan@telent.net>
Date:   Mon, 18 May 2026 23:26:48 +0100

die with sensible error message if socket path too long

Diffstat:
M
luad.c
 | 
6
+++++-

1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/luad.c b/luad.c
@@ -32,7 +32,11 @@ static void handle_sigchld(int num) {
 int open_socket(char * pathname) {
     struct sockaddr_un addr;
     addr.sun_family = AF_UNIX;
-    strncpy(addr.sun_path, pathname, sizeof(addr.sun_path) - 1);
+    if(strlen(pathname) > sizeof(addr.sun_path)) {
+        die("pathname \"%s\" is too long to  bind as unix socket (max %lu)",
+            pathname, sizeof(addr.sun_path));
+    }
+    strcpy(addr.sun_path, pathname);
 
     int fd = socket(AF_LOCAL, SOCK_DGRAM, PF_LOCAL);
     if(fd < 0) {