Upon fork, copy the copyin_check structure to the new map, otherwise

the xonly rules are not applied a child.  This was due to the same
misunderstanding as with msyscall a few days ago.
ok guenther kettenis

diff --git a/sys/uvm/uvm_map.c b/sys/uvm/uvm_map.c
index 7ee39c7..620cece 100644 (file)
--- a/sys/uvm/uvm_map.c
+++ b/sys/uvm/uvm_map.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: uvm_map.c,v 1.310 2023/02/11 21:11:37 deraadt Exp $   */
+/*     $OpenBSD: uvm_map.c,v 1.311 2023/02/13 14:51:49 deraadt Exp $   */
 /*     $NetBSD: uvm_map.c,v 1.86 2000/11/27 08:40:03 chs Exp $ */
 
 /*
@@ -3983,6 +3983,14 @@ uvmspace_fork(struct process *pr)
                }
        }
        new_map->flags |= old_map->flags & VM_MAP_SYSCALL_ONCE;
+#ifdef PMAP_CHECK_COPYIN
+       if (PMAP_CHECK_COPYIN) {
+               memcpy(&new_map->check_copyin, &old_map->check_copyin,
+                   sizeof(new_map->check_copyin));
+               membar_producer();
+               new_map->check_copyin_count = old_map->check_copyin_count;
+       }
+#endif
 
        vm_map_unlock(old_map);
        vm_map_unlock(new_map);