From: deraadt <deraadt@openbsd.org>
Date: Sat, 11 Feb 2023 21:11:37 +0000 (+0000)
Subject: I forgot to copy the msyscall interlock flag to forked processes, so
X-Git-Url: http://artulab.com/gitweb/?a=commitdiff_plain;h=6d452f5a5795b40c3088871f87b71df686d51007;p=openbsd

I forgot to copy the msyscall interlock flag to forked processes, so
only freshly executed processes were actually locked.  (This happened
because I didn't realize how the uvm_map's contents are copied entry
by entry, and other parts are not)
ok kettenis
---

diff --git a/sys/uvm/uvm_map.c b/sys/uvm/uvm_map.c
index 9ee15eaab94..7ee39c71838 100644
--- a/sys/uvm/uvm_map.c
+++ b/sys/uvm/uvm_map.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: uvm_map.c,v 1.309 2023/01/31 15:18:55 deraadt Exp $	*/
+/*	$OpenBSD: uvm_map.c,v 1.310 2023/02/11 21:11:37 deraadt Exp $	*/
 /*	$NetBSD: uvm_map.c,v 1.86 2000/11/27 08:40:03 chs Exp $	*/
 
 /*
@@ -3982,6 +3982,7 @@ uvmspace_fork(struct process *pr)
 			    new_map, new_entry->start, new_entry->end);
 		}
 	}
+	new_map->flags |= old_map->flags & VM_MAP_SYSCALL_ONCE;
 
 	vm_map_unlock(old_map);
 	vm_map_unlock(new_map);