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
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
|
#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2018 Joe Lawrence <joe.lawrence@redhat.com>
. $(dirname $0)/functions.sh
MOD_LIVEPATCH=test_klp_callbacks_demo
MOD_LIVEPATCH2=test_klp_callbacks_demo2
MOD_TARGET=test_klp_callbacks_mod
MOD_TARGET_BUSY=test_klp_callbacks_busy
setup_config
# Test a combination of loading a kernel module and a livepatch that
# patches a function in the first module. Load the target module
# before the livepatch module. Unload them in the same order.
#
# - On livepatch enable, before the livepatch transition starts,
# pre-patch callbacks are executed for vmlinux and $MOD_TARGET (those
# klp_objects currently loaded). After klp_objects are patched
# according to the klp_patch, their post-patch callbacks run and the
# transition completes.
#
# - Similarly, on livepatch disable, pre-patch callbacks run before the
# unpatching transition starts. klp_objects are reverted, post-patch
# callbacks execute and the transition completes.
start_test "target module before livepatch"
load_mod $MOD_TARGET
load_lp $MOD_LIVEPATCH
disable_lp $MOD_LIVEPATCH
unload_lp $MOD_LIVEPATCH
unload_mod $MOD_TARGET
check_result "% modprobe $MOD_TARGET
$MOD_TARGET: ${MOD_TARGET}_init
% modprobe $MOD_LIVEPATCH
livepatch: enabling patch '$MOD_LIVEPATCH'
livepatch: '$MOD_LIVEPATCH': initializing patching transition
$MOD_LIVEPATCH: pre_patch_callback: vmlinux
$MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET -> [MODULE_STATE_LIVE] Normal state
livepatch: '$MOD_LIVEPATCH': starting patching transition
livepatch: '$MOD_LIVEPATCH': completing patching transition
$MOD_LIVEPATCH: post_patch_callback: vmlinux
$MOD_LIVEPATCH: post_patch_callback: $MOD_TARGET -> [MODULE_STATE_LIVE] Normal state
livepatch: '$MOD_LIVEPATCH': patching complete
% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
$MOD_LIVEPATCH: pre_unpatch_callback: vmlinux
$MOD_LIVEPATCH: pre_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_LIVE] Normal state
livepatch: '$MOD_LIVEPATCH': starting unpatching transition
livepatch: '$MOD_LIVEPATCH': completing unpatching transition
$MOD_LIVEPATCH: post_unpatch_callback: vmlinux
$MOD_LIVEPATCH: post_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_LIVE] Normal state
livepatch: '$MOD_LIVEPATCH': unpatching complete
% rmmod $MOD_LIVEPATCH
% rmmod $MOD_TARGET
$MOD_TARGET: ${MOD_TARGET}_exit"
# This test is similar to the previous test, but (un)load the livepatch
# module before the target kernel module. This tests the livepatch
# core's module_coming handler.
#
# - On livepatch enable, only pre/post-patch callbacks are executed for
# currently loaded klp_objects, in this case, vmlinux.
#
# - When a targeted module is subsequently loaded, only its
# pre/post-patch callbacks are executed.
#
# - On livepatch disable, all currently loaded klp_objects' (vmlinux and
# $MOD_TARGET) pre/post-unpatch callbacks are executed.
start_test "module_coming notifier"
load_lp $MOD_LIVEPATCH
load_mod $MOD_TARGET
disable_lp $MOD_LIVEPATCH
unload_lp $MOD_LIVEPATCH
unload_mod $MOD_TARGET
check_result "% modprobe $MOD_LIVEPATCH
livepatch: enabling patch '$MOD_LIVEPATCH'
livepatch: '$MOD_LIVEPATCH': initializing patching transition
$MOD_LIVEPATCH: pre_patch_callback: vmlinux
livepatch: '$MOD_LIVEPATCH': starting patching transition
livepatch: '$MOD_LIVEPATCH': completing patching transition
$MOD_LIVEPATCH: post_patch_callback: vmlinux
livepatch: '$MOD_LIVEPATCH': patching complete
% modprobe $MOD_TARGET
livepatch: applying patch '$MOD_LIVEPATCH' to loading module '$MOD_TARGET'
$MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET -> [MODULE_STATE_COMING] Full formed, running module_init
$MOD_LIVEPATCH: post_patch_callback: $MOD_TARGET -> [MODULE_STATE_COMING] Full formed, running module_init
$MOD_TARGET: ${MOD_TARGET}_init
% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
$MOD_LIVEPATCH: pre_unpatch_callback: vmlinux
$MOD_LIVEPATCH: pre_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_LIVE] Normal state
livepatch: '$MOD_LIVEPATCH': starting unpatching transition
livepatch: '$MOD_LIVEPATCH': completing unpatching transition
$MOD_LIVEPATCH: post_unpatch_callback: vmlinux
$MOD_LIVEPATCH: post_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_LIVE] Normal state
livepatch: '$MOD_LIVEPATCH': unpatching complete
% rmmod $MOD_LIVEPATCH
% rmmod $MOD_TARGET
$MOD_TARGET: ${MOD_TARGET}_exit"
# Test loading the livepatch after a targeted kernel module, then unload
# the kernel module before disabling the livepatch. This tests the
# livepatch core's module_going handler.
#
# - First load a target module, then the livepatch.
#
# - When a target module is unloaded, the livepatch is only reverted
# from that klp_object ($MOD_TARGET). As such, only its pre and
# post-unpatch callbacks are executed when this occurs.
#
# - When the livepatch is disabled, pre and post-unpatch callbacks are
# run for the remaining klp_object, vmlinux.
start_test "module_going notifier"
load_mod $MOD_TARGET
load_lp $MOD_LIVEPATCH
unload_mod $MOD_TARGET
disable_lp $MOD_LIVEPATCH
unload_lp $MOD_LIVEPATCH
check_result "% modprobe $MOD_TARGET
$MOD_TARGET: ${MOD_TARGET}_init
% modprobe $MOD_LIVEPATCH
livepatch: enabling patch '$MOD_LIVEPATCH'
livepatch: '$MOD_LIVEPATCH': initializing patching transition
$MOD_LIVEPATCH: pre_patch_callback: vmlinux
$MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET -> [MODULE_STATE_LIVE] Normal state
livepatch: '$MOD_LIVEPATCH': starting patching transition
livepatch: '$MOD_LIVEPATCH': completing patching transition
$MOD_LIVEPATCH: post_patch_callback: vmlinux
$MOD_LIVEPATCH: post_patch_callback: $MOD_TARGET -> [MODULE_STATE_LIVE] Normal state
livepatch: '$MOD_LIVEPATCH': patching complete
% rmmod $MOD_TARGET
$MOD_TARGET: ${MOD_TARGET}_exit
$MOD_LIVEPATCH: pre_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_GOING] Going away
livepatch: reverting patch '$MOD_LIVEPATCH' on unloading module '$MOD_TARGET'
$MOD_LIVEPATCH: post_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_GOING] Going away
% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
$MOD_LIVEPATCH: pre_unpatch_callback: vmlinux
livepatch: '$MOD_LIVEPATCH': starting unpatching transition
livepatch: '$MOD_LIVEPATCH': completing unpatching transition
$MOD_LIVEPATCH: post_unpatch_callback: vmlinux
livepatch: '$MOD_LIVEPATCH': unpatching complete
% rmmod $MOD_LIVEPATCH"
# This test is similar to the previous test, however the livepatch is
# loaded first. This tests the livepatch core's module_coming and
# module_going handlers.
#
# - First load the livepatch.
#
# - When a targeted kernel module is subsequently loaded, only its
# pre/post-patch callbacks are executed.
#
# - When the target module is unloaded, the livepatch is only reverted
# from the $MOD_TARGET klp_object. As such, only pre and
# post-unpatch callbacks are executed when this occurs.
start_test "module_coming and module_going notifiers"
load_lp $MOD_LIVEPATCH
load_mod $MOD_TARGET
unload_mod $MOD_TARGET
disable_lp $MOD_LIVEPATCH
unload_lp $MOD_LIVEPATCH
check_result "% modprobe $MOD_LIVEPATCH
livepatch: enabling patch '$MOD_LIVEPATCH'
livepatch: '$MOD_LIVEPATCH': initializing patching transition
$MOD_LIVEPATCH: pre_patch_callback: vmlinux
livepatch: '$MOD_LIVEPATCH': starting patching transition
livepatch: '$MOD_LIVEPATCH': completing patching transition
$MOD_LIVEPATCH: post_patch_callback: vmlinux
livepatch: '$MOD_LIVEPATCH': patching complete
% modprobe $MOD_TARGET
livepatch: applying patch '$MOD_LIVEPATCH' to loading module '$MOD_TARGET'
$MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET -> [MODULE_STATE_COMING] Full formed, running module_init
$MOD_LIVEPATCH: post_patch_callback: $MOD_TARGET -> [MODULE_STATE_COMING] Full formed, running module_init
$MOD_TARGET: ${MOD_TARGET}_init
% rmmod $MOD_TARGET
$MOD_TARGET: ${MOD_TARGET}_exit
$MOD_LIVEPATCH: pre_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_GOING] Going away
livepatch: reverting patch '$MOD_LIVEPATCH' on unloading module '$MOD_TARGET'
$MOD_LIVEPATCH: post_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_GOING] Going away
% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
$MOD_LIVEPATCH: pre_unpatch_callback: vmlinux
livepatch: '$MOD_LIVEPATCH': starting unpatching transition
livepatch: '$MOD_LIVEPATCH': completing unpatching transition
$MOD_LIVEPATCH: post_unpatch_callback: vmlinux
livepatch: '$MOD_LIVEPATCH': unpatching complete
% rmmod $MOD_LIVEPATCH"
# A simple test of loading a livepatch without one of its patch target
# klp_objects ever loaded ($MOD_TARGET).
#
# - Load the livepatch.
#
# - As expected, only pre/post-(un)patch handlers are executed for
# vmlinux.
start_test "target module not present"
load_lp $MOD_LIVEPATCH
disable_lp $MOD_LIVEPATCH
unload_lp $MOD_LIVEPATCH
check_result "% modprobe $MOD_LIVEPATCH
livepatch: enabling patch '$MOD_LIVEPATCH'
livepatch: '$MOD_LIVEPATCH': initializing patching transition
$MOD_LIVEPATCH: pre_patch_callback: vmlinux
livepatch: '$MOD_LIVEPATCH': starting patching transition
livepatch: '$MOD_LIVEPATCH': completing patching transition
$MOD_LIVEPATCH: post_patch_callback: vmlinux
livepatch: '$MOD_LIVEPATCH': patching complete
% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
$MOD_LIVEPATCH: pre_unpatch_callback: vmlinux
livepatch: '$MOD_LIVEPATCH': starting unpatching transition
livepatch: '$MOD_LIVEPATCH': completing unpatching transition
$MOD_LIVEPATCH: post_unpatch_callback: vmlinux
livepatch: '$MOD_LIVEPATCH': unpatching complete
% rmmod $MOD_LIVEPATCH"
# Test a scenario where a vmlinux pre-patch callback returns a non-zero
# status (ie, failure).
#
# - First load a target module.
#
# - Load the livepatch module, setting its 'pre_patch_ret' value to -19
# (-ENODEV). When its vmlinux pre-patch callback executes, this
# status code will propagate back to the module-loading subsystem.
# The result is that the insmod command refuses to load the livepatch
# module.
start_test "pre-patch callback -ENODEV"
load_mod $MOD_TARGET
load_failing_mod $MOD_LIVEPATCH pre_patch_ret=-19
unload_mod $MOD_TARGET
check_result "% modprobe $MOD_TARGET
$MOD_TARGET: ${MOD_TARGET}_init
% modprobe $MOD_LIVEPATCH pre_patch_ret=-19
livepatch: enabling patch '$MOD_LIVEPATCH'
livepatch: '$MOD_LIVEPATCH': initializing patching transition
test_klp_callbacks_demo: pre_patch_callback: vmlinux
livepatch: pre-patch callback failed for object 'vmlinux'
livepatch: failed to enable patch '$MOD_LIVEPATCH'
livepatch: '$MOD_LIVEPATCH': canceling patching transition, going to unpatch
livepatch: '$MOD_LIVEPATCH': completing unpatching transition
livepatch: '$MOD_LIVEPATCH': unpatching complete
modprobe: ERROR: could not insert '$MOD_LIVEPATCH': No such device
% rmmod $MOD_TARGET
$MOD_TARGET: ${MOD_TARGET}_exit"
# Similar to the previous test, setup a livepatch such that its vmlinux
# pre-patch callback returns success. However, when a targeted kernel
# module is later loaded, have the livepatch return a failing status
# code.
#
# - Load the livepatch, vmlinux pre-patch callback succeeds.
#
# - Set a trap so subsequent pre-patch callbacks to this livepatch will
# return -ENODEV.
#
# - The livepatch pre-patch callback for subsequently loaded target
# modules will return failure, so the module loader refuses to load
# the kernel module. No post-patch or pre/post-unpatch callbacks are
# executed for this klp_object.
#
# - Pre/post-unpatch callbacks are run for the vmlinux klp_object.
start_test "module_coming + pre-patch callback -ENODEV"
load_lp $MOD_LIVEPATCH
set_pre_patch_ret $MOD_LIVEPATCH -19
load_failing_mod $MOD_TARGET
disable_lp $MOD_LIVEPATCH
unload_lp $MOD_LIVEPATCH
check_result "% modprobe $MOD_LIVEPATCH
livepatch: enabling patch '$MOD_LIVEPATCH'
livepatch: '$MOD_LIVEPATCH': initializing patching transition
$MOD_LIVEPATCH: pre_patch_callback: vmlinux
livepatch: '$MOD_LIVEPATCH': starting patching transition
livepatch: '$MOD_LIVEPATCH': completing patching transition
$MOD_LIVEPATCH: post_patch_callback: vmlinux
livepatch: '$MOD_LIVEPATCH': patching complete
% echo -19 > /sys/module/$MOD_LIVEPATCH/parameters/pre_patch_ret
% modprobe $MOD_TARGET
livepatch: applying patch '$MOD_LIVEPATCH' to loading module '$MOD_TARGET'
$MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET -> [MODULE_STATE_COMING] Full formed, running module_init
livepatch: pre-patch callback failed for object '$MOD_TARGET'
livepatch: patch '$MOD_LIVEPATCH' failed for module '$MOD_TARGET', refusing to load module '$MOD_TARGET'
modprobe: ERROR: could not insert '$MOD_TARGET': No such device
% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
$MOD_LIVEPATCH: pre_unpatch_callback: vmlinux
livepatch: '$MOD_LIVEPATCH': starting unpatching transition
livepatch: '$MOD_LIVEPATCH': completing unpatching transition
$MOD_LIVEPATCH: post_unpatch_callback: vmlinux
livepatch: '$MOD_LIVEPATCH': unpatching complete
% rmmod $MOD_LIVEPATCH"
# Test loading multiple targeted kernel modules. This test-case is
# mainly for comparing with the next test-case.
#
# - Load a target "busy" kernel module which kicks off a worker function
# that immediately exits.
#
# - Proceed with loading the livepatch and another ordinary target
# module. Post-patch callbacks are executed and the transition
# completes quickly.
start_test "multiple target modules"
load_mod $MOD_TARGET_BUSY block_transition=N
load_lp $MOD_LIVEPATCH
load_mod $MOD_TARGET
unload_mod $MOD_TARGET
disable_lp $MOD_LIVEPATCH
unload_lp $MOD_LIVEPATCH
unload_mod $MOD_TARGET_BUSY
check_result "% modprobe $MOD_TARGET_BUSY block_transition=N
$MOD_TARGET_BUSY: ${MOD_TARGET_BUSY}_init
$MOD_TARGET_BUSY: busymod_work_func enter
$MOD_TARGET_BUSY: busymod_work_func exit
% modprobe $MOD_LIVEPATCH
livepatch: enabling patch '$MOD_LIVEPATCH'
livepatch: '$MOD_LIVEPATCH': initializing patching transition
$MOD_LIVEPATCH: pre_patch_callback: vmlinux
$MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET_BUSY -> [MODULE_STATE_LIVE] Normal state
livepatch: '$MOD_LIVEPATCH': starting patching transition
livepatch: '$MOD_LIVEPATCH': completing patching transition
$MOD_LIVEPATCH: post_patch_callback: vmlinux
$MOD_LIVEPATCH: post_patch_callback: $MOD_TARGET_BUSY -> [MODULE_STATE_LIVE] Normal state
livepatch: '$MOD_LIVEPATCH': patching complete
% modprobe $MOD_TARGET
livepatch: applying patch '$MOD_LIVEPATCH' to loading module '$MOD_TARGET'
$MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET -> [MODULE_STATE_COMING] Full formed, running module_init
$MOD_LIVEPATCH: post_patch_callback: $MOD_TARGET -> [MODULE_STATE_COMING] Full formed, running module_init
$MOD_TARGET: ${MOD_TARGET}_init
% rmmod $MOD_TARGET
$MOD_TARGET: ${MOD_TARGET}_exit
$MOD_LIVEPATCH: pre_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_GOING] Going away
livepatch: reverting patch '$MOD_LIVEPATCH' on unloading module '$MOD_TARGET'
$MOD_LIVEPATCH: post_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_GOING] Going away
% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
$MOD_LIVEPATCH: pre_unpatch_callback: vmlinux
$MOD_LIVEPATCH: pre_unpatch_callback: $MOD_TARGET_BUSY -> [MODULE_STATE_LIVE] Normal state
livepatch: '$MOD_LIVEPATCH': starting unpatching transition
livepatch: '$MOD_LIVEPATCH': completing unpatching transition
$MOD_LIVEPATCH: post_unpatch_callback: vmlinux
$MOD_LIVEPATCH: post_unpatch_callback: $MOD_TARGET_BUSY -> [MODULE_STATE_LIVE] Normal state
livepatch: '$MOD_LIVEPATCH': unpatching complete
% rmmod $MOD_LIVEPATCH
% rmmod $MOD_TARGET_BUSY
$MOD_TARGET_BUSY: ${MOD_TARGET_BUSY}_exit"
# A similar test as the previous one, but force the "busy" kernel module
# to block the livepatch transition.
#
# The livepatching core will refuse to patch a task that is currently
# executing a to-be-patched function -- the consistency model stalls the
# current patch transition until this safety-check is met. Test a
# scenario where one of a livepatch's target klp_objects sits on such a
# function for a long time. Meanwhile, load and unload other target
# kernel modules while the livepatch transition is in progress.
#
# - Load the "busy" kernel module, this time make its work function loop
#
# - Meanwhile, the livepatch is loaded. Notice that the patch
# transition does not complete as the targeted "busy" module is
# sitting on a to-be-patched function.
#
# - Load a second target module (this one is an ordinary idle kernel
# module). Note that *no* post-patch callbacks will be executed while
# the livepatch is still in transition.
#
# - Request an unload of the simple kernel module. The patch is still
# transitioning, so its pre-unpatch callbacks are skipped.
#
# - Finally the livepatch is disabled. Since none of the patch's
# klp_object's post-patch callbacks executed, the remaining
# klp_object's pre-unpatch callbacks are skipped.
start_test "busy target module"
load_mod $MOD_TARGET_BUSY block_transition=Y
load_lp_nowait $MOD_LIVEPATCH
# Wait until the livepatch reports in-transition state, i.e. that it's
# stalled on $MOD_TARGET_BUSY::busymod_work_func()
loop_until 'grep -q '^1$' /sys/kernel/livepatch/$MOD_LIVEPATCH/transition' ||
die "failed to stall transition"
load_mod $MOD_TARGET
unload_mod $MOD_TARGET
disable_lp $MOD_LIVEPATCH
unload_lp $MOD_LIVEPATCH
unload_mod $MOD_TARGET_BUSY
check_result "% modprobe $MOD_TARGET_BUSY block_transition=Y
$MOD_TARGET_BUSY: ${MOD_TARGET_BUSY}_init
$MOD_TARGET_BUSY: busymod_work_func enter
% modprobe $MOD_LIVEPATCH
livepatch: enabling patch '$MOD_LIVEPATCH'
livepatch: '$MOD_LIVEPATCH': initializing patching transition
$MOD_LIVEPATCH: pre_patch_callback: vmlinux
$MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET_BUSY -> [MODULE_STATE_LIVE] Normal state
livepatch: '$MOD_LIVEPATCH': starting patching transition
% modprobe $MOD_TARGET
livepatch: applying patch '$MOD_LIVEPATCH' to loading module '$MOD_TARGET'
$MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET -> [MODULE_STATE_COMING] Full formed, running module_init
$MOD_TARGET: ${MOD_TARGET}_init
% rmmod $MOD_TARGET
$MOD_TARGET: ${MOD_TARGET}_exit
livepatch: reverting patch '$MOD_LIVEPATCH' on unloading module '$MOD_TARGET'
$MOD_LIVEPATCH: post_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_GOING] Going away
% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
livepatch: '$MOD_LIVEPATCH': reversing transition from patching to unpatching
livepatch: '$MOD_LIVEPATCH': starting unpatching transition
livepatch: '$MOD_LIVEPATCH': completing unpatching transition
$MOD_LIVEPATCH: post_unpatch_callback: vmlinux
$MOD_LIVEPATCH: post_unpatch_callback: $MOD_TARGET_BUSY -> [MODULE_STATE_LIVE] Normal state
livepatch: '$MOD_LIVEPATCH': unpatching complete
% rmmod $MOD_LIVEPATCH
% rmmod $MOD_TARGET_BUSY
$MOD_TARGET_BUSY: busymod_work_func exit
$MOD_TARGET_BUSY: ${MOD_TARGET_BUSY}_exit"
# Test loading multiple livepatches. This test-case is mainly for comparing
# with the next test-case.
#
# - Load and unload two livepatches, pre and post (un)patch callbacks
# execute as each patch progresses through its (un)patching
# transition.
start_test "multiple livepatches"
load_lp $MOD_LIVEPATCH
load_lp $MOD_LIVEPATCH2
disable_lp $MOD_LIVEPATCH2
disable_lp $MOD_LIVEPATCH
unload_lp $MOD_LIVEPATCH2
unload_lp $MOD_LIVEPATCH
check_result "% modprobe $MOD_LIVEPATCH
livepatch: enabling patch '$MOD_LIVEPATCH'
livepatch: '$MOD_LIVEPATCH': initializing patching transition
$MOD_LIVEPATCH: pre_patch_callback: vmlinux
livepatch: '$MOD_LIVEPATCH': starting patching transition
livepatch: '$MOD_LIVEPATCH': completing patching transition
$MOD_LIVEPATCH: post_patch_callback: vmlinux
livepatch: '$MOD_LIVEPATCH': patching complete
% modprobe $MOD_LIVEPATCH2
livepatch: enabling patch '$MOD_LIVEPATCH2'
livepatch: '$MOD_LIVEPATCH2': initializing patching transition
$MOD_LIVEPATCH2: pre_patch_callback: vmlinux
livepatch: '$MOD_LIVEPATCH2': starting patching transition
livepatch: '$MOD_LIVEPATCH2': completing patching transition
$MOD_LIVEPATCH2: post_patch_callback: vmlinux
livepatch: '$MOD_LIVEPATCH2': patching complete
% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH2/enabled
livepatch: '$MOD_LIVEPATCH2': initializing unpatching transition
$MOD_LIVEPATCH2: pre_unpatch_callback: vmlinux
livepatch: '$MOD_LIVEPATCH2': starting unpatching transition
livepatch: '$MOD_LIVEPATCH2': completing unpatching transition
$MOD_LIVEPATCH2: post_unpatch_callback: vmlinux
livepatch: '$MOD_LIVEPATCH2': unpatching complete
% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
$MOD_LIVEPATCH: pre_unpatch_callback: vmlinux
livepatch: '$MOD_LIVEPATCH': starting unpatching transition
livepatch: '$MOD_LIVEPATCH': completing unpatching transition
$MOD_LIVEPATCH: post_unpatch_callback: vmlinux
livepatch: '$MOD_LIVEPATCH': unpatching complete
% rmmod $MOD_LIVEPATCH2
% rmmod $MOD_LIVEPATCH"
# Load multiple livepatches, but the second as an 'atomic-replace'
# patch. When the latter loads, the original livepatch should be
# disabled and *none* of its pre/post-unpatch callbacks executed. On
# the other hand, when the atomic-replace livepatch is disabled, its
# pre/post-unpatch callbacks *should* be executed.
#
# - Load and unload two livepatches, the second of which has its
# .replace flag set true.
#
# - Pre and post patch callbacks are executed for both livepatches.
#
# - Once the atomic replace module is loaded, only its pre and post
# unpatch callbacks are executed.
start_test "atomic replace"
load_lp $MOD_LIVEPATCH
load_lp $MOD_LIVEPATCH2 replace=1
disable_lp $MOD_LIVEPATCH2
unload_lp $MOD_LIVEPATCH2
unload_lp $MOD_LIVEPATCH
check_result "% modprobe $MOD_LIVEPATCH
livepatch: enabling patch '$MOD_LIVEPATCH'
livepatch: '$MOD_LIVEPATCH': initializing patching transition
$MOD_LIVEPATCH: pre_patch_callback: vmlinux
livepatch: '$MOD_LIVEPATCH': starting patching transition
livepatch: '$MOD_LIVEPATCH': completing patching transition
$MOD_LIVEPATCH: post_patch_callback: vmlinux
livepatch: '$MOD_LIVEPATCH': patching complete
% modprobe $MOD_LIVEPATCH2 replace=1
livepatch: enabling patch '$MOD_LIVEPATCH2'
livepatch: '$MOD_LIVEPATCH2': initializing patching transition
$MOD_LIVEPATCH2: pre_patch_callback: vmlinux
livepatch: '$MOD_LIVEPATCH2': starting patching transition
livepatch: '$MOD_LIVEPATCH2': completing patching transition
$MOD_LIVEPATCH2: post_patch_callback: vmlinux
livepatch: '$MOD_LIVEPATCH2': patching complete
% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH2/enabled
livepatch: '$MOD_LIVEPATCH2': initializing unpatching transition
$MOD_LIVEPATCH2: pre_unpatch_callback: vmlinux
livepatch: '$MOD_LIVEPATCH2': starting unpatching transition
livepatch: '$MOD_LIVEPATCH2': completing unpatching transition
$MOD_LIVEPATCH2: post_unpatch_callback: vmlinux
livepatch: '$MOD_LIVEPATCH2': unpatching complete
% rmmod $MOD_LIVEPATCH2
% rmmod $MOD_LIVEPATCH"
exit 0
|
