From 9f4e9fc9c86f6c8ab1c1cf246d58d998924e0f88 Mon Sep 17 00:00:00 2001
From: kettenis <kettenis@openbsd.org>
Date: Sun, 22 Jul 2018 14:33:44 +0000
Subject: [PATCH] In uvm_map_protect(), make sure we select a first map entry
 that ends after the start of the range of pages that we're changing. 
 Prevents a panic from a somewhat convoluted test case that anton@ came up
 with.

ok guenther@, anton@
---
 sys/uvm/uvm_map.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sys/uvm/uvm_map.c b/sys/uvm/uvm_map.c
index 756a5c28134..c8a814d8e3c 100644
--- a/sys/uvm/uvm_map.c
+++ b/sys/uvm/uvm_map.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: uvm_map.c,v 1.237 2018/04/18 16:05:21 deraadt Exp $	*/
+/*	$OpenBSD: uvm_map.c,v 1.238 2018/07/22 14:33:44 kettenis Exp $	*/
 /*	$NetBSD: uvm_map.c,v 1.86 2000/11/27 08:40:03 chs Exp $	*/
 
 /*
@@ -3197,7 +3197,7 @@ uvm_map_protect(struct vm_map *map, vaddr_t start, vaddr_t end,
 	 */
 	first = uvm_map_entrybyaddr(&map->addr, start);
 	KDASSERT(first != NULL);
-	if (first->end < start)
+	if (first->end <= start)
 		first = RBT_NEXT(uvm_map_addr, first);
 
 	/* First, check for protection violations. */
-- 
2.20.1