Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
Merge tag 'livepatching-for-7.1' of git://git.kernel.org/pub/scm/linux/kernel/git/livepatching/livepatching
Pull livepatching updates from Petr Mladek:
- Add two new selftests
* tag 'livepatching-for-7.1' of git://git.kernel.org/pub/scm/linux/kernel/git/livepatching/livepatching:
selftests/livepatch: add test for module function patching
selftests: livepatch: test-ftrace: livepatch a traced function
+230
+36
tools/testing/selftests/livepatch/test-ftrace.sh
+36
tools/testing/selftests/livepatch/test-ftrace.sh
···
95
95
livepatch: '$MOD_LIVEPATCH': unpatching complete
96
96
% rmmod $MOD_LIVEPATCH"
97
97
98
+
99
+
# - trace a function
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# - verify livepatch can load targgeting on the same traced function
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# - check if the livepatch is in effect
102
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# - reset trace and unload livepatch
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+
104
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start_test "livepatch a traced function and check that the live patch remains in effect"
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106
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FUNCTION_NAME="cmdline_proc_show"
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+
108
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trace_function "$FUNCTION_NAME"
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load_lp $MOD_LIVEPATCH
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+
111
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if [[ "$(cat /proc/cmdline)" == "$MOD_LIVEPATCH: this has been live patched" ]] ; then
112
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log "livepatch: ok"
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fi
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+
115
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check_traced_functions "$FUNCTION_NAME"
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+
117
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disable_lp $MOD_LIVEPATCH
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unload_lp $MOD_LIVEPATCH
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+
120
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check_result "% insmod test_modules/$MOD_LIVEPATCH.ko
121
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livepatch: enabling patch '$MOD_LIVEPATCH'
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livepatch: '$MOD_LIVEPATCH': initializing patching transition
123
+
livepatch: '$MOD_LIVEPATCH': starting patching transition
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livepatch: '$MOD_LIVEPATCH': completing patching transition
125
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livepatch: '$MOD_LIVEPATCH': patching complete
126
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livepatch: ok
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% echo 0 > $SYSFS_KLP_DIR/$MOD_LIVEPATCH/enabled
128
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livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
129
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livepatch: '$MOD_LIVEPATCH': starting unpatching transition
130
+
livepatch: '$MOD_LIVEPATCH': completing unpatching transition
131
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livepatch: '$MOD_LIVEPATCH': unpatching complete
132
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% rmmod $MOD_LIVEPATCH"
133
+
98
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exit 0
+100
tools/testing/selftests/livepatch/test-livepatch.sh
+100
tools/testing/selftests/livepatch/test-livepatch.sh
···
8
8
MOD_LIVEPATCH2=test_klp_syscall
9
9
MOD_LIVEPATCH3=test_klp_callbacks_demo
10
10
MOD_REPLACE=test_klp_atomic_replace
11
+
MOD_TARGET=test_klp_mod_target
12
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MOD_TARGET_PATCH=test_klp_mod_patch
11
13
12
14
setup_config
13
15
···
196
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livepatch: '$MOD_REPLACE': completing unpatching transition
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livepatch: '$MOD_REPLACE': unpatching complete
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% rmmod $MOD_REPLACE"
197
+
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+
199
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# - load a target module that provides /proc/test_klp_mod_target with
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# original output
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# - load a livepatch that patches the target module's show function
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# - verify the proc entry returns livepatched output
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# - disable and unload the livepatch
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# - verify the proc entry returns original output again
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# - unload the target module
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start_test "module function patching"
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load_mod $MOD_TARGET
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if [[ "$(cat /proc/$MOD_TARGET)" != "$MOD_TARGET: original output" ]] ; then
212
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echo -e "FAIL\n\n"
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die "livepatch kselftest(s) failed"
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fi
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load_lp $MOD_TARGET_PATCH
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+
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if [[ "$(cat /proc/$MOD_TARGET)" != "$MOD_TARGET_PATCH: this has been live patched" ]] ; then
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echo -e "FAIL\n\n"
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die "livepatch kselftest(s) failed"
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fi
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+
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disable_lp $MOD_TARGET_PATCH
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unload_lp $MOD_TARGET_PATCH
225
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226
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if [[ "$(cat /proc/$MOD_TARGET)" != "$MOD_TARGET: original output" ]] ; then
227
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echo -e "FAIL\n\n"
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die "livepatch kselftest(s) failed"
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fi
230
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unload_mod $MOD_TARGET
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+
233
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check_result "% insmod test_modules/$MOD_TARGET.ko
234
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$MOD_TARGET: test_klp_mod_target_init
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% insmod test_modules/$MOD_TARGET_PATCH.ko
236
+
livepatch: enabling patch '$MOD_TARGET_PATCH'
237
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livepatch: '$MOD_TARGET_PATCH': initializing patching transition
238
+
livepatch: '$MOD_TARGET_PATCH': starting patching transition
239
+
livepatch: '$MOD_TARGET_PATCH': completing patching transition
240
+
livepatch: '$MOD_TARGET_PATCH': patching complete
241
+
% echo 0 > $SYSFS_KLP_DIR/$MOD_TARGET_PATCH/enabled
242
+
livepatch: '$MOD_TARGET_PATCH': initializing unpatching transition
243
+
livepatch: '$MOD_TARGET_PATCH': starting unpatching transition
244
+
livepatch: '$MOD_TARGET_PATCH': completing unpatching transition
245
+
livepatch: '$MOD_TARGET_PATCH': unpatching complete
246
+
% rmmod $MOD_TARGET_PATCH
247
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% rmmod $MOD_TARGET
248
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$MOD_TARGET: test_klp_mod_target_exit"
249
+
250
+
251
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# - load a livepatch that targets a not-yet-loaded module
252
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# - load the target module: klp_module_coming patches it immediately
253
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# - verify the proc entry returns livepatched output
254
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# - disable and unload the livepatch
255
+
# - verify the proc entry returns original output again
256
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# - unload the target module
257
+
258
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start_test "module function patching (livepatch first)"
259
+
260
+
load_lp $MOD_TARGET_PATCH
261
+
load_mod $MOD_TARGET
262
+
263
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if [[ "$(cat /proc/$MOD_TARGET)" != "$MOD_TARGET_PATCH: this has been live patched" ]] ; then
264
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echo -e "FAIL\n\n"
265
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die "livepatch kselftest(s) failed"
266
+
fi
267
+
268
+
disable_lp $MOD_TARGET_PATCH
269
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unload_lp $MOD_TARGET_PATCH
270
+
271
+
if [[ "$(cat /proc/$MOD_TARGET)" != "$MOD_TARGET: original output" ]] ; then
272
+
echo -e "FAIL\n\n"
273
+
die "livepatch kselftest(s) failed"
274
+
fi
275
+
276
+
unload_mod $MOD_TARGET
277
+
278
+
check_result "% insmod test_modules/$MOD_TARGET_PATCH.ko
279
+
livepatch: enabling patch '$MOD_TARGET_PATCH'
280
+
livepatch: '$MOD_TARGET_PATCH': initializing patching transition
281
+
livepatch: '$MOD_TARGET_PATCH': starting patching transition
282
+
livepatch: '$MOD_TARGET_PATCH': completing patching transition
283
+
livepatch: '$MOD_TARGET_PATCH': patching complete
284
+
% insmod test_modules/$MOD_TARGET.ko
285
+
livepatch: applying patch '$MOD_TARGET_PATCH' to loading module '$MOD_TARGET'
286
+
$MOD_TARGET: test_klp_mod_target_init
287
+
% echo 0 > $SYSFS_KLP_DIR/$MOD_TARGET_PATCH/enabled
288
+
livepatch: '$MOD_TARGET_PATCH': initializing unpatching transition
289
+
livepatch: '$MOD_TARGET_PATCH': starting unpatching transition
290
+
livepatch: '$MOD_TARGET_PATCH': completing unpatching transition
291
+
livepatch: '$MOD_TARGET_PATCH': unpatching complete
292
+
% rmmod $MOD_TARGET_PATCH
293
+
% rmmod $MOD_TARGET
294
+
$MOD_TARGET: test_klp_mod_target_exit"
199
295
200
296
201
297
exit 0
+2
tools/testing/selftests/livepatch/test_modules/Makefile
+2
tools/testing/selftests/livepatch/test_modules/Makefile
+53
tools/testing/selftests/livepatch/test_modules/test_klp_mod_patch.c
+53
tools/testing/selftests/livepatch/test_modules/test_klp_mod_patch.c
···
1
+
// SPDX-License-Identifier: GPL-2.0
2
+
// Copyright (C) 2026 Pablo Hugen <phugen@redhat.com>
3
+
4
+
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
5
+
6
+
#include <linux/module.h>
7
+
#include <linux/kernel.h>
8
+
#include <linux/livepatch.h>
9
+
#include <linux/seq_file.h>
10
+
11
+
static int livepatch_mod_target_show(struct seq_file *m, void *v)
12
+
{
13
+
seq_printf(m, "%s: %s\n", THIS_MODULE->name,
14
+
"this has been live patched");
15
+
return 0;
16
+
}
17
+
18
+
static struct klp_func funcs[] = {
19
+
{
20
+
.old_name = "test_klp_mod_target_show",
21
+
.new_func = livepatch_mod_target_show,
22
+
},
23
+
{},
24
+
};
25
+
26
+
static struct klp_object objs[] = {
27
+
{
28
+
.name = "test_klp_mod_target",
29
+
.funcs = funcs,
30
+
},
31
+
{},
32
+
};
33
+
34
+
static struct klp_patch patch = {
35
+
.mod = THIS_MODULE,
36
+
.objs = objs,
37
+
};
38
+
39
+
static int test_klp_mod_patch_init(void)
40
+
{
41
+
return klp_enable_patch(&patch);
42
+
}
43
+
44
+
static void test_klp_mod_patch_exit(void)
45
+
{
46
+
}
47
+
48
+
module_init(test_klp_mod_patch_init);
49
+
module_exit(test_klp_mod_patch_exit);
50
+
MODULE_LICENSE("GPL");
51
+
MODULE_INFO(livepatch, "Y");
52
+
MODULE_AUTHOR("Pablo Hugen <phugen@redhat.com>");
53
+
MODULE_DESCRIPTION("Livepatch test: patch for module-provided function");
+39
tools/testing/selftests/livepatch/test_modules/test_klp_mod_target.c
+39
tools/testing/selftests/livepatch/test_modules/test_klp_mod_target.c
···
1
+
// SPDX-License-Identifier: GPL-2.0
2
+
// Copyright (C) 2026 Pablo Hugen <phugen@redhat.com>
3
+
4
+
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
5
+
6
+
#include <linux/module.h>
7
+
#include <linux/kernel.h>
8
+
#include <linux/proc_fs.h>
9
+
#include <linux/seq_file.h>
10
+
11
+
static struct proc_dir_entry *pde;
12
+
13
+
static noinline int test_klp_mod_target_show(struct seq_file *m, void *v)
14
+
{
15
+
seq_printf(m, "%s: %s\n", THIS_MODULE->name, "original output");
16
+
return 0;
17
+
}
18
+
19
+
static int test_klp_mod_target_init(void)
20
+
{
21
+
pr_info("%s\n", __func__);
22
+
pde = proc_create_single("test_klp_mod_target", 0, NULL,
23
+
test_klp_mod_target_show);
24
+
if (!pde)
25
+
return -ENOMEM;
26
+
return 0;
27
+
}
28
+
29
+
static void test_klp_mod_target_exit(void)
30
+
{
31
+
pr_info("%s\n", __func__);
32
+
proc_remove(pde);
33
+
}
34
+
35
+
module_init(test_klp_mod_target_init);
36
+
module_exit(test_klp_mod_target_exit);
37
+
MODULE_LICENSE("GPL");
38
+
MODULE_AUTHOR("Pablo Hugen <phugen@redhat.com>");
39
+
MODULE_DESCRIPTION("Livepatch test: target module with proc entry");