From a6f237a247886ff9e1cb03ae15cd797e452355f1 Mon Sep 17 00:00:00 2001
From: Idan Horowitz <idan.horowitz@gmail.com>
Date: Sat, 9 Jul 2022 22:26:58 +0300
Subject: [PATCH] Kernel: Accept SHUT_RD and SHUT_WR as shutdown() how values

The previous check for valid how values assumed this field was a bitmap
and that SHUT_RDWR was simply a bitwise or of SHUT_RD and SHUT_WR,
which is not the case.
---
 Kernel/Syscalls/socket.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Kernel/Syscalls/socket.cpp b/Kernel/Syscalls/socket.cpp
index 4e2247673e..c3a3c859eb 100644
--- a/Kernel/Syscalls/socket.cpp
+++ b/Kernel/Syscalls/socket.cpp
@@ -160,7 +160,7 @@ ErrorOr<FlatPtr> Process::sys$shutdown(int sockfd, int how)
 {
     VERIFY_NO_PROCESS_BIG_LOCK(this)
     TRY(require_promise(Pledge::stdio));
-    if (how & ~SHUT_RDWR)
+    if (how != SHUT_RD && how != SHUT_WR && how != SHUT_RDWR)
         return EINVAL;
     auto description = TRY(open_file_description(sockfd));
     if (!description->is_socket())