From f5d916a8811b706bf224fadc17f2832f899ab52b Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Mon, 25 Jan 2021 09:35:25 +0100
Subject: [PATCH] Kernel: Make sys$anon_create() fail if size == 0

An empty anonymous file is useless since it cannot be resized anyway,
so let's not support creating it.
---
 Kernel/Syscalls/anon_create.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Kernel/Syscalls/anon_create.cpp b/Kernel/Syscalls/anon_create.cpp
index 63192c70a1..6756b9688b 100644
--- a/Kernel/Syscalls/anon_create.cpp
+++ b/Kernel/Syscalls/anon_create.cpp
@@ -35,6 +35,9 @@ int Process::sys$anon_create(size_t size, int options)
 {
     REQUIRE_PROMISE(stdio);
 
+    if (!size)
+        return -EINVAL;
+
     if (size % PAGE_SIZE)
         return -EINVAL;