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      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 #
     30 tmp="/tmp/sysctl.out"
     31 
     32 getrint() {
     33 	echo $(od -An -N2 -i /dev/urandom | sed 's/ //')
     34 }
     35 
     36 getrstr() {
     37 	echo $(cat /dev/urandom | head -n 1 | base64)
     38 }
     39 
     40 atf_test_case random_garbage cleanup
     41 random_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 
     48 random_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 
     90 random_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 
    106 atf_init_test_cases() {
    107 	atf_add_test_case random_garbage
    108 }
    109