From: deraadt <deraadt@openbsd.org>
Date: Tue, 2 Mar 2021 17:43:04 +0000 (+0000)
Subject: document ENOTSUP wxallowed/wxneeded behaviour more clearly; ok kurt
X-Git-Url: http://artulab.com/gitweb/?a=commitdiff_plain;h=fd874303f21d95e37c4b1c2e7e2d403ce351bd90;p=openbsd

document ENOTSUP wxallowed/wxneeded behaviour more clearly; ok kurt
---

diff --git a/lib/libc/sys/mmap.2 b/lib/libc/sys/mmap.2
index cdd744c0a0e..2210a8ec78d 100644
--- a/lib/libc/sys/mmap.2
+++ b/lib/libc/sys/mmap.2
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: mmap.2,v 1.65 2019/12/21 05:23:38 jsg Exp $
+.\"	$OpenBSD: mmap.2,v 1.66 2021/03/02 17:43:04 deraadt Exp $
 .\"	$NetBSD: mmap.2,v 1.5 1995/06/24 10:48:59 cgd Exp $
 .\"
 .\" Copyright (c) 1991, 1993
@@ -30,7 +30,7 @@
 .\"
 .\"	@(#)mmap.2	8.1 (Berkeley) 6/4/93
 .\"
-.Dd $Mdocdate: December 21 2019 $
+.Dd $Mdocdate: March 2 2021 $
 .Dt MMAP 2
 .Os
 .Sh NAME
@@ -291,11 +291,15 @@ The accesses requested in the
 argument are not allowed.
 In particular,
 .Dv PROT_WRITE | PROT_EXEC
-mappings are not permitted in most binaries (see
+mappings are not permitted unless the filesystem is mounted
+.Cm wxallowed
+and the process is link-time tagged with
+.Cm wxneeded .
+(See also
 .Dv kern.wxabort
 in
 .Xr sysctl 2
-for more information).
+for a method to diagnose failure).
 .El
 .Sh SEE ALSO
 .Xr madvise 2 ,