From 866f5c51a08025593c5fbf32feb9a705be7cdc95 Mon Sep 17 00:00:00 2001
From: Ken Sato <ken.sato.ty@hitachi-solutions.com>
Date: Wed, 3 Feb 2021 08:37:21 +0900
Subject: [PATCH] docs: add limitation of system calls that call copy_to_user()

Change-Id: If449c73f8d5949ab5526ea598b0f713ed4431157
Refs: #1514
---
 docs/users.rst | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/docs/users.rst b/docs/users.rst
index 32a6ba9e..7842ff78 100644
--- a/docs/users.rst
+++ b/docs/users.rst
@@ -214,3 +214,9 @@ Limitations
     ::
 
        sudo systemctl restart xos_hwb
+
+31. System calls can write the mcexec VMAs with PROT_WRITE flag not
+    set. This is because we never turn off PROT_WRITE of the mcexec
+    VMAs to circumvent the issue "set_host_vma(): do NOT read protect
+    Linux VMA".
+