From f42d00b36b30fd4f1f3d103a13b7ddb9c1e4e545 Mon Sep 17 00:00:00 2001
From: deraadt <deraadt@openbsd.org>
Date: Sat, 10 Oct 2015 00:10:07 +0000
Subject: [PATCH] ksh can run with pledge "stdio rpath wpath cpath getpw fattr
 proc exec tty" if the mknod builtin is disabled.  It looks like a lot of
 abilities, but hey, this is a shell.  can't open sockets or do other nasty
 stuff though. (we'll leave the mknod builtin enabled on the install media for
 now; there is work happening to regain the MAKEDEV performance in a different
 way) discussions with otto & millert in particular

---
 bin/ksh/Makefile             | 3 ++-
 bin/ksh/c_sh.c               | 6 +++++-
 bin/ksh/main.c               | 7 ++++++-
 distrib/special/ksh/Makefile | 4 ++--
 4 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/bin/ksh/Makefile b/bin/ksh/Makefile
index 2c484896928..a5a2fc2b825 100644
--- a/bin/ksh/Makefile
+++ b/bin/ksh/Makefile
@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile,v 1.29 2013/12/02 20:41:01 millert Exp $
+#	$OpenBSD: Makefile,v 1.30 2015/10/10 00:10:07 deraadt Exp $
 
 PROG=	ksh
 SRCS=	alloc.c c_ksh.c c_sh.c c_test.c c_ulimit.c edit.c emacs.c eval.c \
@@ -6,6 +6,7 @@ SRCS=	alloc.c c_ksh.c c_sh.c c_test.c c_ulimit.c edit.c emacs.c eval.c \
 	misc.c path.c shf.c syn.c table.c trap.c tree.c tty.c var.c \
 	version.c vi.c
 
+# -DMKNOD - enable builtin mknod; conficts with pledge(2)
 DEFS=	-Wall
 CFLAGS+=${DEFS} -I. -I${.CURDIR} -I${.CURDIR}/../../lib/libc/gen
 MAN=	ksh.1 sh.1
diff --git a/bin/ksh/c_sh.c b/bin/ksh/c_sh.c
index 18f99c898b6..25ce11696b9 100644
--- a/bin/ksh/c_sh.c
+++ b/bin/ksh/c_sh.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: c_sh.c,v 1.49 2015/09/18 07:28:24 nicm Exp $	*/
+/*	$OpenBSD: c_sh.c,v 1.50 2015/10/10 00:10:07 deraadt Exp $	*/
 
 /*
  * built-in Bourne commands
@@ -817,6 +817,7 @@ c_exec(char **wp)
 	return 0;
 }
 
+#ifdef MKNOD
 static int
 c_mknod(char **wp)
 {
@@ -870,6 +871,7 @@ usage:
 	bi_errorf("usage: mknod [-m mode] name p");
 	return 1;
 }
+#endif /* MKNOD */
 
 static int
 c_suspend(char **wp)
@@ -929,7 +931,9 @@ const struct builtin shbuiltins [] = {
 	{"ulimit", c_ulimit},
 	{"+umask", c_umask},
 	{"*=unset", c_unset},
+#ifdef MKNOD
 	{"mknod", c_mknod},
+#endif
 	{"suspend", c_suspend},
 	{NULL, NULL}
 };
diff --git a/bin/ksh/main.c b/bin/ksh/main.c
index 63ec3324c67..c6bfd305820 100644
--- a/bin/ksh/main.c
+++ b/bin/ksh/main.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: main.c,v 1.60 2015/09/18 07:28:24 nicm Exp $	*/
+/*	$OpenBSD: main.c,v 1.61 2015/10/10 00:10:07 deraadt Exp $	*/
 
 /*
  * startup, main loop, environments and error handling
@@ -102,6 +102,11 @@ main(int argc, char *argv[])
 
 	kshname = argv[0];
 
+#ifndef MKNOD
+	if (pledge("stdio rpath wpath cpath getpw fattr proc exec tty", NULL) == -1)
+		perror("pledge");
+#endif
+
 	ainit(&aperm);		/* initialize permanent Area */
 
 	/* set up base environment */
diff --git a/distrib/special/ksh/Makefile b/distrib/special/ksh/Makefile
index 9e286592811..00cd33dc112 100644
--- a/distrib/special/ksh/Makefile
+++ b/distrib/special/ksh/Makefile
@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile,v 1.1 2014/12/23 17:16:02 deraadt Exp $
+#	$OpenBSD: Makefile,v 1.2 2015/10/10 00:10:07 deraadt Exp $
 
 PROG=	ksh
 SRCS=	alloc.c c_ksh.c c_sh.c c_test.c c_ulimit.c edit.c emacs.c eval.c \
@@ -6,7 +6,7 @@ SRCS=	alloc.c c_ksh.c c_sh.c c_test.c c_ulimit.c edit.c emacs.c eval.c \
 	misc.c path.c shf.c syn.c table.c trap.c tree.c tty.c var.c \
 	version.c vi.c
 
-DEFS=	-Wall
+DEFS=	-Wall -DMKNOD
 CFLAGS+=${DEFS} -I. -I${.CURDIR}/../../../bin/ksh -I${.CURDIR}/../../../lib/libc/gen
 MAN=	ksh.1 sh.1
 
-- 
2.20.1