From 4584f3c24242d21c45db75df904235400fac34cc Mon Sep 17 00:00:00 2001
From: kettenis <kettenis@openbsd.org>
Date: Tue, 14 Sep 2021 16:16:51 +0000
Subject: [PATCH] Make pmap_extract() mpsafe by grabbing the kernel lock for
 userland pmaps while walking the page tables.

ok deraadt@
---
 sys/arch/hppa/hppa/pmap.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/sys/arch/hppa/hppa/pmap.c b/sys/arch/hppa/hppa/pmap.c
index 52f2c73ae9c..b1dbcf437e7 100644
--- a/sys/arch/hppa/hppa/pmap.c
+++ b/sys/arch/hppa/hppa/pmap.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: pmap.c,v 1.176 2021/09/05 11:44:46 mpi Exp $	*/
+/*	$OpenBSD: pmap.c,v 1.177 2021/09/14 16:16:51 kettenis Exp $	*/
 
 /*
  * Copyright (c) 1998-2004 Michael Shalayeff
@@ -1090,7 +1090,10 @@ pmap_extract(struct pmap *pmap, vaddr_t va, paddr_t *pap)
 
 	DPRINTF(PDB_FOLLOW|PDB_EXTRACT, ("pmap_extract(%p, %lx)\n", pmap, va));
 
+	pmap_lock(pmap);
 	pte = pmap_vp_find(pmap, va);
+	pmap_unlock(pmap);
+
 	if (pte) {
 		if (pap)
 			*pap = (pte & ~PGOFSET) | (va & PGOFSET);
-- 
2.20.1