summaryrefslogtreecommitdiff
path: root/tools/testing/selftests/livepatch/functions.sh
blob: c7b9fb45d7c9eddddcd609dd945d75ef155d4574 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2018 Joe Lawrence <joe.lawrence@redhat.com>

# Shell functions for the rest of the scripts.

MAX_RETRIES=600
RETRY_INTERVAL=".1"	# seconds

# log(msg) - write message to kernel log
#	msg - insightful words
function log() {
	echo "$1" > /dev/kmsg
}

# die(msg) - game over, man
#	msg - dying words
function die() {
	log "ERROR: $1"
	echo "ERROR: $1" >&2
	exit 1
}

# set_dynamic_debug() - setup kernel dynamic debug
#	TODO - push and pop this config?
function set_dynamic_debug() {
	cat << EOF > /sys/kernel/debug/dynamic_debug/control
file kernel/livepatch/* +p
func klp_try_switch_task -p
EOF
}

# loop_until(cmd) - loop a command until it is successful or $MAX_RETRIES,
#		    sleep $RETRY_INTERVAL between attempts
#	cmd - command and its arguments to run
function loop_until() {
	local cmd="$*"
	local i=0
	while true; do
		eval "$cmd" && return 0
		[[ $((i++)) -eq $MAX_RETRIES ]] && return 1
		sleep $RETRY_INTERVAL
	done
}

function is_livepatch_mod() {
	local mod="$1"

	if [[ $(modinfo "$mod" | awk '/^livepatch:/{print $NF}') == "Y" ]]; then
		return 0
	fi

	return 1
}

function __load_mod() {
	local mod="$1"; shift
	local args="$*"

	local msg="% modprobe $mod $args"
	log "${msg%% }"
	ret=$(modprobe "$mod" "$args" 2>&1)
	if [[ "$ret" != "" ]]; then
		die "$ret"
	fi

	# Wait for module in sysfs ...
	loop_until '[[ -e "/sys/module/$mod" ]]' ||
		die "failed to load module $mod"
}


# load_mod(modname, params) - load a kernel module
#	modname - module name to load
#	params  - module parameters to pass to modprobe
function load_mod() {
	local mod="$1"; shift
	local args="$*"

	is_livepatch_mod "$mod" &&
		die "use load_lp() to load the livepatch module $mod"

	__load_mod "$mod" "$args"
}

# load_lp_nowait(modname, params) - load a kernel module with a livepatch
#			but do not wait on until the transition finishes
#	modname - module name to load
#	params  - module parameters to pass to modprobe
function load_lp_nowait() {
	local mod="$1"; shift
	local args="$*"

	is_livepatch_mod "$mod" ||
		die "module $mod is not a livepatch"

	__load_mod "$mod" "$args"

	# Wait for livepatch in sysfs ...
	loop_until '[[ -e "/sys/kernel/livepatch/$mod" ]]' ||
		die "failed to load module $mod (sysfs)"
}

# load_lp(modname, params) - load a kernel module with a livepatch
#	modname - module name to load
#	params  - module parameters to pass to modprobe
function load_lp() {
	local mod="$1"; shift
	local args="$*"

	load_lp_nowait "$mod" "$args"

	# Wait until the transition finishes ...
	loop_until 'grep -q '^0$' /sys/kernel/livepatch/$mod/transition' ||
		die "failed to complete transition"
}

# load_failing_mod(modname, params) - load a kernel module, expect to fail
#	modname - module name to load
#	params  - module parameters to pass to modprobe
function load_failing_mod() {
	local mod="$1"; shift
	local args="$*"

	local msg="% modprobe $mod $args"
	log "${msg%% }"
	ret=$(modprobe "$mod" "$args" 2>&1)
	if [[ "$ret" == "" ]]; then
		die "$mod unexpectedly loaded"
	fi
	log "$ret"
}

# unload_mod(modname) - unload a kernel module
#	modname - module name to unload
function unload_mod() {
	local mod="$1"

	# Wait for module reference count to clear ...
	loop_until '[[ $(cat "/sys/module/$mod/refcnt") == "0" ]]' ||
		die "failed to unload module $mod (refcnt)"

	log "% rmmod $mod"
	ret=$(rmmod "$mod" 2>&1)
	if [[ "$ret" != "" ]]; then
		die "$ret"
	fi

	# Wait for module in sysfs ...
	loop_until '[[ ! -e "/sys/module/$mod" ]]' ||
		die "failed to unload module $mod (/sys/module)"
}

# unload_lp(modname) - unload a kernel module with a livepatch
#	modname - module name to unload
function unload_lp() {
	unload_mod "$1"
}

# disable_lp(modname) - disable a livepatch
#	modname - module name to unload
function disable_lp() {
	local mod="$1"

	log "% echo 0 > /sys/kernel/livepatch/$mod/enabled"
	echo 0 > /sys/kernel/livepatch/"$mod"/enabled

	# Wait until the transition finishes and the livepatch gets
	# removed from sysfs...
	loop_until '[[ ! -e "/sys/kernel/livepatch/$mod" ]]' ||
		die "failed to disable livepatch $mod"
}

# set_pre_patch_ret(modname, pre_patch_ret)
#	modname - module name to set
#	pre_patch_ret - new pre_patch_ret value
function set_pre_patch_ret {
	local mod="$1"; shift
	local ret="$1"

	log "% echo $ret > /sys/module/$mod/parameters/pre_patch_ret"
	echo "$ret" > /sys/module/"$mod"/parameters/pre_patch_ret

	# Wait for sysfs value to hold ...
	loop_until '[[ $(cat "/sys/module/$mod/parameters/pre_patch_ret") == "$ret" ]]' ||
		die "failed to set pre_patch_ret parameter for $mod module"
}

# check_result() - verify dmesg output
#	TODO - better filter, out of order msgs, etc?
function check_result {
	local expect="$*"
	local result

	result=$(dmesg | grep -v 'tainting' | grep -e 'livepatch:' -e 'test_klp' | sed 's/^\[[ 0-9.]*\] //')

	if [[ "$expect" == "$result" ]] ; then
		echo "ok"
	else
		echo -e "not ok\n\n$(diff -upr --label expected --label result <(echo "$expect") <(echo "$result"))\n"
		die "livepatch kselftest(s) failed"
	fi
}