1# $NetBSD: t_random_garbage.sh,v 1.4 2020/07/27 07:36:19 jruoho Exp $
2#
3# Copyright (c) 2020 The NetBSD Foundation, Inc.
4# All rights reserved.
5#
6# This code is derived from software contributed to The NetBSD Foundation
7# by Jukka Ruohonen.
8#
9# Redistribution and use in source and binary forms, with or without
10# modification, are permitted provided that the following conditions
11# are met:
12# 1. Redistributions of source code must retain the above copyright
13#    notice, this list of conditions and the following disclaimer.
14# 2. Redistributions in binary form must reproduce the above copyright
15#    notice, this list of conditions and the following disclaimer in the
16#    documentation and/or other materials provided with the distribution.
17#
18# THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
19# ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
20# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
21# PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
22# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28# POSSIBILITY OF SUCH DAMAGE.
29#
30tmp="/tmp/sysctl.out"
31
32getrint() {
33	echo $(od -An -N2 -i /dev/urandom | sed 's/ //')
34}
35
36getrstr() {
37	echo $(cat /dev/urandom | head -n 1 | base64)
38}
39
40atf_test_case random_garbage cleanup
41random_garbage_head() {
42	sysctl -a > $tmp
43	atf_set "require.user" "root"
44	atf_set "descr" "Test writing random garbage " \
45		"to sysctl nodes (PR kern/55451)"
46}
47
48random_garbage_body() {
49
50	if ! [ $(atf_config_get "run_unsafe" "no") = "yes" ]; then
51		atf_skip "The test is not safe (PR kern/55451)"
52	fi
53
54	while read line; do
55
56		var=$(echo $line | awk '{print $1}')
57
58		case $var in
59			hw.acpi.sleep.state)
60			echo "Skipping $var"
61			continue
62			;;
63
64			kern.securelevel*)
65			echo "Skipping $var"
66			continue
67			;;
68
69			kern.veriexec.strict)
70			echo "Skipping $var"
71			continue
72			;;
73
74			security*)
75			echo "Skipping $var"
76			continue
77			;;
78		esac
79
80		val=$(getrint)
81		echo "Write $var -> $val"
82		sysctl -w $var=$val
83		val=$(getrstr)
84		echo "Write $var -> $val"
85		sysctl -w $var=$val
86
87	done < $tmp
88}
89
90random_garbage_cleanup() {
91
92	if ! [ $(atf_config_get "run_unsafe" "no") = "yes" ]; then
93		atf_skip "The test is not safe (PR kern/55451)"
94	fi
95
96	while read line; do
97		var=$(echo $line | awk '{print $1}')
98		val=$(echo $line | awk '{print $3}')
99		echo "Restoring $var -> $val"
100		sysctl -w $var=$val > /dev/null 2>&1
101	done < $tmp
102
103	rm $tmp
104}
105
106atf_init_test_cases() {
107	atf_add_test_case random_garbage
108}
109