svn commit: r366918 - head/lib/libc/sys
Konstantin Belousov
kib at FreeBSD.org
Wed Oct 21 21:40:34 UTC 2020
Author: kib
Date: Wed Oct 21 21:40:33 2020
New Revision: 366918
URL: https://svnweb.freebsd.org/changeset/base/366918
Log:
mmap(2): Document guard size for MAP_STACK and related EINVAL.
Based on submission by: emaste
Reviewed by: emaste, markj
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D26894
Modified:
head/lib/libc/sys/mmap.2
Modified: head/lib/libc/sys/mmap.2
==============================================================================
--- head/lib/libc/sys/mmap.2 Wed Oct 21 21:28:20 2020 (r366917)
+++ head/lib/libc/sys/mmap.2 Wed Oct 21 21:40:33 2020 (r366918)
@@ -28,7 +28,7 @@
.\" @(#)mmap.2 8.4 (Berkeley) 5/11/95
.\" $FreeBSD$
.\"
-.Dd February 26, 2020
+.Dd October 21, 2020
.Dt MMAP 2
.Os
.Sh NAME
@@ -351,6 +351,8 @@ Stacks created with
automatically grow.
Guards prevent inadvertent use of the regions into which those
stacks can grow without requiring mapping the whole stack in advance.
+The size of the guard, in pages, is specified by sysctl
+.Dv security.bsd.stack_guard_page .
.El
.Pp
The
@@ -451,6 +453,11 @@ or
.Dv MAP_STACK
was specified.
At least one of these flags must be included.
+.It Bq Er EINVAL
+.Dv MAP_STACK
+was specified and
+.Va len
+is less than or equal to the guard size.
.It Bq Er EINVAL
.Dv MAP_FIXED
was specified and the
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