From 3e174337abe8072d40c06fb168f544c0ed73c5d7 Mon Sep 17 00:00:00 2001
From: apio <blobs.trading@gmail.com>
Date: Thu, 24 Aug 2023 15:28:08 +0200
Subject: [PATCH] init: Hostname validation

---
 apps/init.cpp | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/apps/init.cpp b/apps/init.cpp
index 9b1f9178..2a16dea5 100644
--- a/apps/init.cpp
+++ b/apps/init.cpp
@@ -3,6 +3,7 @@
 #include <luna/PathParser.h>
 #include <luna/Sort.h>
 #include <luna/String.h>
+#include <luna/Utf8.h>
 #include <luna/Vector.h>
 #include <os/ArgumentParser.h>
 #include <os/Directory.h>
@@ -300,6 +301,19 @@ static Result<void> set_hostname()
     auto hostname = TRY(file->read_line());
     hostname.trim("\n");
 
+    if (hostname.is_empty())
+    {
+        do_log("[init] /etc/hostname is empty or invalid, keeping the default hostname\n");
+        return {};
+    }
+
+    Utf8StringDecoder decoder(hostname.chars());
+    if (decoder.code_points().has_error())
+    {
+        do_log("[init] /etc/hostname is not valid UTF-8, keeping the default hostname\n");
+        return {};
+    }
+
     if (sethostname(hostname.chars(), hostname.length()) < 0) return {};
 
     do_log("[init] successfully set system hostname to '%s'\n", hostname.chars());