D26894.diff
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	Index: head/lib/libc/sys/mmap.2
	===================================================================
	--- head/lib/libc/sys/mmap.2
	+++ head/lib/libc/sys/mmap.2
	@@ -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 @@
	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 @@
	.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