From d1ffdea55014bcf900a5cda175bb68356d28c6c3 Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Mon, 13 Apr 2020 11:58:00 +0200
Subject: [PATCH] LibC: Fix truncated strncpy() in getlogin()

---
 Libraries/LibC/unistd.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Libraries/LibC/unistd.cpp b/Libraries/LibC/unistd.cpp
index d1891c146a..8b03c9df3e 100644
--- a/Libraries/LibC/unistd.cpp
+++ b/Libraries/LibC/unistd.cpp
@@ -538,7 +538,7 @@ char* getlogin()
 {
     static char __getlogin_buffer[256];
     if (auto* passwd = getpwuid(getuid())) {
-        strncpy(__getlogin_buffer, passwd->pw_name, sizeof(__getlogin_buffer));
+        strncpy(__getlogin_buffer, passwd->pw_name, sizeof(__getlogin_buffer) - 1);
         endpwent();
         return __getlogin_buffer;
     }