From b00f338989dc039b32121c9fd6c7d64b6b69bd13 Mon Sep 17 00:00:00 2001
From: mestre <mestre@openbsd.org>
Date: Wed, 15 Dec 2021 11:21:35 +0000
Subject: [PATCH] restrict all filesystem access with unveil(2).

hid_start(3) opens `table' through libusbhid, then usbhidctl(1) itself opens
`dev', after that it's just performing ioctls on the fd left opened by the
latter so all fs access can be disabled.
---
 usr.bin/usbhidctl/usbhid.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/usr.bin/usbhidctl/usbhid.c b/usr.bin/usbhidctl/usbhid.c
index 25cc61bdf93..1560bb365d4 100644
--- a/usr.bin/usbhidctl/usbhid.c
+++ b/usr.bin/usbhidctl/usbhid.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: usbhid.c,v 1.17 2021/05/31 18:30:11 jcs Exp $	*/
+/*	$OpenBSD: usbhid.c,v 1.18 2021/12/15 11:21:35 mestre Exp $	*/
 /*      $NetBSD: usbhid.c,v 1.22 2002/02/20 20:30:42 christos Exp $ */
 
 /*
@@ -941,6 +941,11 @@ main(int argc, char **argv)
 	if (hidfd == -1)
 		err(1, "%s", dev);
 
+	if (unveil("/", "") == -1)
+		err(1, "unveil /");
+	if (unveil(NULL, NULL) == -1)
+		err(1, "unveil");
+
 	if (ioctl(hidfd, USB_GET_REPORT_ID, &reportid) == -1)
 		reportid = -1;
 	if (verbose > 1)
-- 
2.20.1