The branch main has been updated by brooks:
URL:
https://cgit.FreeBSD.org/src/commit/?id=85bea309f935111cb362035795a59c263536b065
commit 85bea309f935111cb362035795a59c263536b065
Author: Brooks Davis <bro...@freebsd.org>
AuthorDate: 2021-09-07 16:28:50 +0000
Commit: Brooks Davis <bro...@freebsd.org>
CommitDate: 2021-09-07 16:28:50 +0000
mprotect.2: Improve the description of prot
The new wording for standard flags is losely based on the POSIX
description.
Make it clearer that PROT_MAX() is a local extension.
Reviewed by: alc, mckusick, imp, kib, markj
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D31777
---
lib/libc/sys/mprotect.2 | 23 +++++++++++++++--------
1 file changed, 15 insertions(+), 8 deletions(-)
diff --git a/lib/libc/sys/mprotect.2 b/lib/libc/sys/mprotect.2
index 5c024dd24d56..c2c7701d624e 100644
--- a/lib/libc/sys/mprotect.2
+++ b/lib/libc/sys/mprotect.2
@@ -28,7 +28,7 @@
.\" @(#)mprotect.2 8.1 (Berkeley) 6/9/93
.\" $FreeBSD$
.\"
-.Dd September 3, 2021
+.Dd September 7, 2021
.Dt MPROTECT 2
.Os
.Sh NAME
@@ -47,12 +47,16 @@ system call
changes the specified pages to have protection
.Fa prot .
.Pp
-Currently these protection bits are known,
-which can be combined, OR'd together:
+The
+.Fa prot
+argument shall be
+.Dv PROT_NONE
+(no permissions at all)
+or the bitwise
+.Em or
+of one or more of the following values:
.Pp
.Bl -tag -width ".Dv PROT_WRITE" -compact
-.It Dv PROT_NONE
-No permissions at all.
.It Dv PROT_READ
The pages can be read.
.It Dv PROT_WRITE
@@ -61,13 +65,16 @@ The pages can be written.
The pages can be executed.
.El
.Pp
-In addition to these protection flags,
+In addition to these standard protection flags,
+the
.Fx
+implementation of
+.Fn mprotect
provides the ability to set the maximum protection of a region
(which prevents
.Nm
-from upgrading the permissions).
-This is accomplished by
+from adding to the permissions later).
+This is accomplished by bitwise
.Em or Ns 'ing
one or more
.Dv PROT_
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