From 8e425c4e976017c09ed2a9b4402067b3595501cc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Daniel=20Ekl=C3=B6f?= <daniel@ekloef.se>
Date: Tue, 7 Jan 2025 12:58:44 +0100
Subject: [PATCH] csi: ignore 'CSI 21 t' - report window title

It's not widely used (don't know _any_ application that uses it), and
can be used to trick users to run unwanted commands.
---
 csi.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/csi.c b/csi.c
index 35a39f82..61cbdced 100644
--- a/csi.c
+++ b/csi.c
@@ -1354,10 +1354,14 @@ csi_dispatch(struct terminal *term, uint8_t final)
             }
 
             case 21: {
+#if 0  /* Disabled for now, see #1894 */
                 char reply[3 + strlen(term->window_title) + 2 + 1];
                 int chars = xsnprintf(
                     reply, sizeof(reply), "\033]l%s\033\\", term->window_title);
                 term_to_slave(term, reply, chars);
+#else
+                LOG_WARN("CSI 21 t (report window title) ignored");
+#endif
                 break;
             }