sync with OpenBSD -current

lib/libc/sys/mimmutable.2

@@ -1,4 +1,4 @@
-.\"	$OpenBSD: mimmutable.2,v 1.4 2024/01/20 13:19:37 deraadt Exp $
+.\"	$OpenBSD: mimmutable.2,v 1.5 2024/01/21 17:46:03 deraadt Exp $
 .\"
 .\" Copyright (c) 1991, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -29,7 +29,7 @@
 .\"
 .\"	@(#)mimmutable.2	8.1 (Berkeley) 6/9/93
 .\"
-.Dd $Mdocdate: January 20 2024 $
+.Dd $Mdocdate: January 21 2024 $
 .Dt MIMMUTABLE 2
 .Os
 .Sh NAME
@@ -45,9 +45,12 @@ The
 system call
 changes currently mapped pages in the region to be marked immutable,
 which means their protection or mapping may not be changed in the future.
+Most requests to
+.Xr madvise 2 ,
+.Xr minherit 2 ,
 .Xr mmap 2 ,
 .Xr mprotect 2 ,
-and
+.Xr msync 2 , and
 .Xr munmap 2
 to pages marked immutable will return with error
 .Er EPERM .
@@ -71,8 +74,12 @@ The virtual address range specified by the
 and
 .Fa len
 arguments is not valid.
+.It Bq Er EPERM
+At least one page has inheritance of
+.Dv MAP_INHERIT_ZERO .
 .El
 .Sh SEE ALSO
+.Xr minherit 2 ,
 .Xr mmap 2 ,
 .Xr mprotect 2 ,
 .Xr munmap 2