From 6826cf6be8688f6a466d4e0ef9347b44341e9bf2 Mon Sep 17 00:00:00 2001
From: rob <rob@openbsd.org>
Date: Thu, 17 Feb 2022 03:12:34 +0000
Subject: [PATCH] Writes to the ps_flags field of struct process should be
 atomic. Ok deraadt@ guenther@

---
 sys/kern/vfs_syscalls.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sys/kern/vfs_syscalls.c b/sys/kern/vfs_syscalls.c
index bfce966733e..31122a286f4 100644
--- a/sys/kern/vfs_syscalls.c
+++ b/sys/kern/vfs_syscalls.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: vfs_syscalls.c,v 1.355 2022/02/15 23:16:00 rob Exp $	*/
+/*	$OpenBSD: vfs_syscalls.c,v 1.356 2022/02/17 03:12:34 rob Exp $	*/
 /*	$NetBSD: vfs_syscalls.c,v 1.71 1996/04/23 10:29:02 mycroft Exp $	*/
 
 /*
@@ -829,7 +829,7 @@ sys_chroot(struct proc *p, void *v, register_t *retval)
 		vrele(old_cdir);
 	} else
 		fdp->fd_rdir = nd.ni_vp;
-	p->p_p->ps_flags |= PS_CHROOT;
+	atomic_setbits_int(&p->p_p->ps_flags, PS_CHROOT);
 	return (0);
 }
 
-- 
2.20.1