xref: /netbsd-src/tests/sbin/sysctl/t_random_garbage.sh (revision d90047b5d07facf36e6c01dcc0bded8997ce9cc2) 
1# $NetBSD: t_random_garbage.sh,v 1.3 2020/07/03 07:03:14 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 > $tmp
43	atf_set "require.user" "root"
44	atf_set "descr" "Test writing random garbage " \
45		"to sysctl nodes (PR kern/55451)"
46}
47
48random_garbage_body() {
49
50	atf_skip "The test is not safe (PR kern/55451)"
51
52	while read line; do
53
54		var=$(echo $line | awk '{print $1}')
55
56		case $var in
57			hw.acpi.sleep.state)
58			echo "Skipping $var"
59			continue
60			;;
61
62			kern.securelevel*)
63			echo "Skipping $var"
64			continue
65			;;
66
67			kern.veriexec.strict)
68			echo "Skipping $var"
69			continue
70			;;
71
72			security*)
73			echo "Skipping $var"
74			continue
75			;;
76		esac
77
78		val=$(getrint)
79		echo "Write $var -> $val"
80		sysctl -w $var=$val
81		val=$(getrstr)
82		echo "Write $var -> $val"
83		sysctl -w $var=$val
84
85	done < $tmp
86}
87
88random_garbage_cleanup() {
89
90	atf_skip "The test is not safe (PR kern/55451)"
91
92	while read line; do
93		var=$(echo $line | awk '{print $1}')
94		val=$(echo $line | awk '{print $3}')
95		echo "Restoring $var -> $val"
96		sysctl -w $var=$val > /dev/null 2>&1
97	done < $tmp
98
99	rm $tmp
100}
101
102atf_init_test_cases() {
103	atf_add_test_case random_garbage
104}
105