From 937b352e23839361e7bcbc84d0e180c1c3bb9285 Mon Sep 17 00:00:00 2001
From: Ed Maste <emaste@FreeBSD.org>
Date: Sat, 9 May 2020 15:56:02 +0000
Subject: remove %n support from printf(9)

It can be dangerous and there is no need for it in the kernel.
Inspired by Kees Cook's change in Linux, and later OpenBSD.

Reviewed by:	cem, gordon, philip
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D24760
---
 share/man/man9/printf.9 | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

(limited to 'share')

diff --git a/share/man/man9/printf.9 b/share/man/man9/printf.9
index 0b4bd826aa5c..1a3640871bd1 100644
--- a/share/man/man9/printf.9
+++ b/share/man/man9/printf.9
@@ -26,7 +26,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd November 18, 2015
+.Dd May 9, 2020
 .Dt PRINTF 9
 .Os
 .Sh NAME
@@ -83,7 +83,7 @@ parameter in the same manner as
 .Xr printf 3 .
 However,
 .Xr printf 9
-adds two other conversion specifiers.
+adds two other conversion specifiers and omits one.
 .Pp
 The
 .Cm \&%b
@@ -121,6 +121,10 @@ If present, a width directive will specify the number of bytes to display.
 By default, 16 bytes of data are output.
 .Pp
 The
+.Cm \&%n
+conversion specifier is not supported.
+.Pp
+The
 .Fn log
 function uses
 .Xr syslog 3
-- 
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