Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
Merge branch 'for-7.1/module-function-test' into for-linus
+194
+100
tools/testing/selftests/livepatch/test-livepatch.sh
+100
tools/testing/selftests/livepatch/test-livepatch.sh
···
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MOD_LIVEPATCH2=test_klp_syscall
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MOD_LIVEPATCH3=test_klp_callbacks_demo
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MOD_REPLACE=test_klp_atomic_replace
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MOD_TARGET=test_klp_mod_target
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MOD_TARGET_PATCH=test_klp_mod_patch
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setup_config
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···
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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"
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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
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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 $MOD_TARGET_PATCH
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if [[ "$(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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disable_lp $MOD_TARGET_PATCH
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unload_lp $MOD_TARGET_PATCH
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if [[ "$(cat /proc/$MOD_TARGET)" != "$MOD_TARGET: original output" ]] ; 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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unload_mod $MOD_TARGET
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check_result "% insmod test_modules/$MOD_TARGET.ko
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$MOD_TARGET: test_klp_mod_target_init
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% insmod test_modules/$MOD_TARGET_PATCH.ko
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livepatch: enabling patch '$MOD_TARGET_PATCH'
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livepatch: '$MOD_TARGET_PATCH': initializing patching transition
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livepatch: '$MOD_TARGET_PATCH': starting patching transition
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livepatch: '$MOD_TARGET_PATCH': completing patching transition
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livepatch: '$MOD_TARGET_PATCH': patching complete
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% echo 0 > $SYSFS_KLP_DIR/$MOD_TARGET_PATCH/enabled
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livepatch: '$MOD_TARGET_PATCH': initializing unpatching transition
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livepatch: '$MOD_TARGET_PATCH': starting unpatching transition
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livepatch: '$MOD_TARGET_PATCH': completing unpatching transition
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livepatch: '$MOD_TARGET_PATCH': unpatching complete
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% rmmod $MOD_TARGET_PATCH
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% rmmod $MOD_TARGET
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$MOD_TARGET: test_klp_mod_target_exit"
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# - load a livepatch that targets a not-yet-loaded module
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# - load the target module: klp_module_coming patches it immediately
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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 (livepatch first)"
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load_lp $MOD_TARGET_PATCH
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load_mod $MOD_TARGET
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if [[ "$(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 $MOD_TARGET_PATCH
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if [[ "$(cat /proc/$MOD_TARGET)" != "$MOD_TARGET: original output" ]] ; 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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unload_mod $MOD_TARGET
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check_result "% insmod test_modules/$MOD_TARGET_PATCH.ko
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livepatch: enabling patch '$MOD_TARGET_PATCH'
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livepatch: '$MOD_TARGET_PATCH': initializing patching transition
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livepatch: '$MOD_TARGET_PATCH': starting patching transition
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livepatch: '$MOD_TARGET_PATCH': completing patching transition
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livepatch: '$MOD_TARGET_PATCH': patching complete
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% insmod test_modules/$MOD_TARGET.ko
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livepatch: applying patch '$MOD_TARGET_PATCH' to loading module '$MOD_TARGET'
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$MOD_TARGET: test_klp_mod_target_init
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% echo 0 > $SYSFS_KLP_DIR/$MOD_TARGET_PATCH/enabled
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livepatch: '$MOD_TARGET_PATCH': initializing unpatching transition
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livepatch: '$MOD_TARGET_PATCH': starting unpatching transition
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livepatch: '$MOD_TARGET_PATCH': completing unpatching transition
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livepatch: '$MOD_TARGET_PATCH': unpatching complete
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% rmmod $MOD_TARGET_PATCH
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% rmmod $MOD_TARGET
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$MOD_TARGET: test_klp_mod_target_exit"
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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
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// Copyright (C) 2026 Pablo Hugen <phugen@redhat.com>
3
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4
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
7
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#include <linux/kernel.h>
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#include <linux/livepatch.h>
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#include <linux/seq_file.h>
10
+
11
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static int livepatch_mod_target_show(struct seq_file *m, void *v)
12
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{
13
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seq_printf(m, "%s: %s\n", THIS_MODULE->name,
14
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"this has been live patched");
15
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return 0;
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}
17
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static struct klp_func funcs[] = {
19
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{
20
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.old_name = "test_klp_mod_target_show",
21
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.new_func = livepatch_mod_target_show,
22
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},
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{},
24
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};
25
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static struct klp_object objs[] = {
27
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{
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.name = "test_klp_mod_target",
29
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.funcs = funcs,
30
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},
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{},
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};
33
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34
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static struct klp_patch patch = {
35
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.mod = THIS_MODULE,
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.objs = objs,
37
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};
38
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39
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static int test_klp_mod_patch_init(void)
40
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{
41
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return klp_enable_patch(&patch);
42
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}
43
+
44
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static void test_klp_mod_patch_exit(void)
45
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{
46
+
}
47
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48
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module_init(test_klp_mod_patch_init);
49
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module_exit(test_klp_mod_patch_exit);
50
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MODULE_LICENSE("GPL");
51
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MODULE_INFO(livepatch, "Y");
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MODULE_AUTHOR("Pablo Hugen <phugen@redhat.com>");
53
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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
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#include <linux/seq_file.h>
10
+
11
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static struct proc_dir_entry *pde;
12
+
13
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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
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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
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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");