From 7751c7e188bfc7b2f7e4a70e33032677d84597e5 Mon Sep 17 00:00:00 2001
From: Maxime Coste <mawww@kakoune.org>
Date: Mon, 25 Jan 2021 17:12:18 +1100
Subject: [PATCH] Check XDG_RUNTIME_DIR owner before creating session directory

This avoids an issue when using `su` and running Kakoune which creates
a session directory owned by root and prevents the user from creating
more sessions.
---
 src/remote.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/remote.cc b/src/remote.cc
index 6ba9164e..0cafd763 100644
--- a/src/remote.cc
+++ b/src/remote.cc
@@ -604,6 +604,10 @@ void make_session_directory()
         // set sticky bit on the shared kakoune directory
         make_directory(format("{}/kakoune", tmpdir()), 01777);
     }
+    else if (struct stat st;
+             stat(xdg_runtime_dir.zstr(), &st) == 0 && st.st_uid != geteuid())
+        throw runtime_error("XDG_RUNTIME_DIR is not owned by current user");
+
     make_directory(session_directory(), 0711);
 }