From b452dd13b6d093b29acf0668fd8e91fd18514a74 Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Tue, 22 Dec 2020 11:33:28 +0100
Subject: [PATCH] Kernel: Allow sys$chmod() to modify the set-gid bit

We were incorrectly masking off the set-gid bit.

Fixes #4060.
---
 Kernel/FileSystem/VirtualFileSystem.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Kernel/FileSystem/VirtualFileSystem.cpp b/Kernel/FileSystem/VirtualFileSystem.cpp
index f8dc1698bf..2aa4663f63 100644
--- a/Kernel/FileSystem/VirtualFileSystem.cpp
+++ b/Kernel/FileSystem/VirtualFileSystem.cpp
@@ -487,7 +487,7 @@ KResult VFS::chmod(Custody& custody, mode_t mode)
         return KResult(-EROFS);
 
     // Only change the permission bits.
-    mode = (inode.mode() & ~04777u) | (mode & 04777u);
+    mode = (inode.mode() & ~06777u) | (mode & 06777u);
     return inode.chmod(mode);
 }