F: include/linux/livepatch.h
F: kernel/livepatch/
F: kernel/module/livepatch.c
-F: lib/livepatch/
F: samples/livepatch/
F: tools/testing/selftests/livepatch/
CONFIG_STRING_SELFTEST=y
CONFIG_TEST_BITOPS=m
CONFIG_TEST_BPF=m
-CONFIG_TEST_LIVEPATCH=m
CONFIG_PERCPU_TEST=m
CONFIG_ATOMIC64_SELFTEST=y
CONFIG_TEST_BPF=m
-CONFIG_TEST_LIVEPATCH=m
If unsure, say N.
-config TEST_LIVEPATCH
- tristate "Test livepatching"
- default n
- depends on DYNAMIC_DEBUG
- depends on LIVEPATCH
- depends on m
- help
- Test kernel livepatching features for correctness. The tests will
- load test modules that will be livepatched in various scenarios.
-
- To run all the livepatching tests:
-
- make -C tools/testing/selftests TARGETS=livepatch run_tests
-
- Alternatively, individual tests may be invoked:
-
- tools/testing/selftests/livepatch/test-callbacks.sh
- tools/testing/selftests/livepatch/test-livepatch.sh
- tools/testing/selftests/livepatch/test-shadow-vars.sh
-
- If unsure, say N.
-
config TEST_OBJAGG
tristate "Perform selftest on object aggreration manager"
default n
obj-$(CONFIG_TEST_FPU) += test_fpu.o
CFLAGS_test_fpu.o += $(FPU_CFLAGS)
-obj-$(CONFIG_TEST_LIVEPATCH) += livepatch/
-
# Some KUnit files (hooks.o) need to be built-in even when KUnit is a module,
# so we can't just use obj-$(CONFIG_KUNIT).
ifdef CONFIG_KUNIT
+++ /dev/null
-# SPDX-License-Identifier: GPL-2.0
-#
-# Makefile for livepatch test code.
-
-obj-$(CONFIG_TEST_LIVEPATCH) += test_klp_atomic_replace.o \
- test_klp_callbacks_demo.o \
- test_klp_callbacks_demo2.o \
- test_klp_callbacks_busy.o \
- test_klp_callbacks_mod.o \
- test_klp_livepatch.o \
- test_klp_shadow_vars.o \
- test_klp_state.o \
- test_klp_state2.o \
- test_klp_state3.o
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-// Copyright (C) 2018 Joe Lawrence <joe.lawrence@redhat.com>
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/livepatch.h>
-
-static int replace;
-module_param(replace, int, 0644);
-MODULE_PARM_DESC(replace, "replace (default=0)");
-
-#include <linux/seq_file.h>
-static int livepatch_meminfo_proc_show(struct seq_file *m, void *v)
-{
- seq_printf(m, "%s: %s\n", THIS_MODULE->name,
- "this has been live patched");
- return 0;
-}
-
-static struct klp_func funcs[] = {
- {
- .old_name = "meminfo_proc_show",
- .new_func = livepatch_meminfo_proc_show,
- }, {}
-};
-
-static struct klp_object objs[] = {
- {
- /* name being NULL means vmlinux */
- .funcs = funcs,
- }, {}
-};
-
-static struct klp_patch patch = {
- .mod = THIS_MODULE,
- .objs = objs,
- /* set .replace in the init function below for demo purposes */
-};
-
-static int test_klp_atomic_replace_init(void)
-{
- patch.replace = replace;
- return klp_enable_patch(&patch);
-}
-
-static void test_klp_atomic_replace_exit(void)
-{
-}
-
-module_init(test_klp_atomic_replace_init);
-module_exit(test_klp_atomic_replace_exit);
-MODULE_LICENSE("GPL");
-MODULE_INFO(livepatch, "Y");
-MODULE_AUTHOR("Joe Lawrence <joe.lawrence@redhat.com>");
-MODULE_DESCRIPTION("Livepatch test: atomic replace");
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-// Copyright (C) 2018 Joe Lawrence <joe.lawrence@redhat.com>
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/sched.h>
-#include <linux/workqueue.h>
-#include <linux/delay.h>
-
-/* load/run-time control from sysfs writer */
-static bool block_transition;
-module_param(block_transition, bool, 0644);
-MODULE_PARM_DESC(block_transition, "block_transition (default=false)");
-
-static void busymod_work_func(struct work_struct *work);
-static DECLARE_WORK(work, busymod_work_func);
-static DECLARE_COMPLETION(busymod_work_started);
-
-static void busymod_work_func(struct work_struct *work)
-{
- pr_info("%s enter\n", __func__);
- complete(&busymod_work_started);
-
- while (READ_ONCE(block_transition)) {
- /*
- * Busy-wait until the sysfs writer has acknowledged a
- * blocked transition and clears the flag.
- */
- msleep(20);
- }
-
- pr_info("%s exit\n", __func__);
-}
-
-static int test_klp_callbacks_busy_init(void)
-{
- pr_info("%s\n", __func__);
- schedule_work(&work);
-
- /*
- * To synchronize kernel messages, hold the init function from
- * exiting until the work function's entry message has printed.
- */
- wait_for_completion(&busymod_work_started);
-
- if (!block_transition) {
- /*
- * Serialize output: print all messages from the work
- * function before returning from init().
- */
- flush_work(&work);
- }
-
- return 0;
-}
-
-static void test_klp_callbacks_busy_exit(void)
-{
- WRITE_ONCE(block_transition, false);
- flush_work(&work);
- pr_info("%s\n", __func__);
-}
-
-module_init(test_klp_callbacks_busy_init);
-module_exit(test_klp_callbacks_busy_exit);
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Joe Lawrence <joe.lawrence@redhat.com>");
-MODULE_DESCRIPTION("Livepatch test: busy target module");
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-// Copyright (C) 2018 Joe Lawrence <joe.lawrence@redhat.com>
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/livepatch.h>
-
-static int pre_patch_ret;
-module_param(pre_patch_ret, int, 0644);
-MODULE_PARM_DESC(pre_patch_ret, "pre_patch_ret (default=0)");
-
-static const char *const module_state[] = {
- [MODULE_STATE_LIVE] = "[MODULE_STATE_LIVE] Normal state",
- [MODULE_STATE_COMING] = "[MODULE_STATE_COMING] Full formed, running module_init",
- [MODULE_STATE_GOING] = "[MODULE_STATE_GOING] Going away",
- [MODULE_STATE_UNFORMED] = "[MODULE_STATE_UNFORMED] Still setting it up",
-};
-
-static void callback_info(const char *callback, struct klp_object *obj)
-{
- if (obj->mod)
- pr_info("%s: %s -> %s\n", callback, obj->mod->name,
- module_state[obj->mod->state]);
- else
- pr_info("%s: vmlinux\n", callback);
-}
-
-/* Executed on object patching (ie, patch enablement) */
-static int pre_patch_callback(struct klp_object *obj)
-{
- callback_info(__func__, obj);
- return pre_patch_ret;
-}
-
-/* Executed on object unpatching (ie, patch disablement) */
-static void post_patch_callback(struct klp_object *obj)
-{
- callback_info(__func__, obj);
-}
-
-/* Executed on object unpatching (ie, patch disablement) */
-static void pre_unpatch_callback(struct klp_object *obj)
-{
- callback_info(__func__, obj);
-}
-
-/* Executed on object unpatching (ie, patch disablement) */
-static void post_unpatch_callback(struct klp_object *obj)
-{
- callback_info(__func__, obj);
-}
-
-static void patched_work_func(struct work_struct *work)
-{
- pr_info("%s\n", __func__);
-}
-
-static struct klp_func no_funcs[] = {
- {}
-};
-
-static struct klp_func busymod_funcs[] = {
- {
- .old_name = "busymod_work_func",
- .new_func = patched_work_func,
- }, {}
-};
-
-static struct klp_object objs[] = {
- {
- .name = NULL, /* vmlinux */
- .funcs = no_funcs,
- .callbacks = {
- .pre_patch = pre_patch_callback,
- .post_patch = post_patch_callback,
- .pre_unpatch = pre_unpatch_callback,
- .post_unpatch = post_unpatch_callback,
- },
- }, {
- .name = "test_klp_callbacks_mod",
- .funcs = no_funcs,
- .callbacks = {
- .pre_patch = pre_patch_callback,
- .post_patch = post_patch_callback,
- .pre_unpatch = pre_unpatch_callback,
- .post_unpatch = post_unpatch_callback,
- },
- }, {
- .name = "test_klp_callbacks_busy",
- .funcs = busymod_funcs,
- .callbacks = {
- .pre_patch = pre_patch_callback,
- .post_patch = post_patch_callback,
- .pre_unpatch = pre_unpatch_callback,
- .post_unpatch = post_unpatch_callback,
- },
- }, { }
-};
-
-static struct klp_patch patch = {
- .mod = THIS_MODULE,
- .objs = objs,
-};
-
-static int test_klp_callbacks_demo_init(void)
-{
- return klp_enable_patch(&patch);
-}
-
-static void test_klp_callbacks_demo_exit(void)
-{
-}
-
-module_init(test_klp_callbacks_demo_init);
-module_exit(test_klp_callbacks_demo_exit);
-MODULE_LICENSE("GPL");
-MODULE_INFO(livepatch, "Y");
-MODULE_AUTHOR("Joe Lawrence <joe.lawrence@redhat.com>");
-MODULE_DESCRIPTION("Livepatch test: livepatch demo");
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-// Copyright (C) 2018 Joe Lawrence <joe.lawrence@redhat.com>
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/livepatch.h>
-
-static int replace;
-module_param(replace, int, 0644);
-MODULE_PARM_DESC(replace, "replace (default=0)");
-
-static const char *const module_state[] = {
- [MODULE_STATE_LIVE] = "[MODULE_STATE_LIVE] Normal state",
- [MODULE_STATE_COMING] = "[MODULE_STATE_COMING] Full formed, running module_init",
- [MODULE_STATE_GOING] = "[MODULE_STATE_GOING] Going away",
- [MODULE_STATE_UNFORMED] = "[MODULE_STATE_UNFORMED] Still setting it up",
-};
-
-static void callback_info(const char *callback, struct klp_object *obj)
-{
- if (obj->mod)
- pr_info("%s: %s -> %s\n", callback, obj->mod->name,
- module_state[obj->mod->state]);
- else
- pr_info("%s: vmlinux\n", callback);
-}
-
-/* Executed on object patching (ie, patch enablement) */
-static int pre_patch_callback(struct klp_object *obj)
-{
- callback_info(__func__, obj);
- return 0;
-}
-
-/* Executed on object unpatching (ie, patch disablement) */
-static void post_patch_callback(struct klp_object *obj)
-{
- callback_info(__func__, obj);
-}
-
-/* Executed on object unpatching (ie, patch disablement) */
-static void pre_unpatch_callback(struct klp_object *obj)
-{
- callback_info(__func__, obj);
-}
-
-/* Executed on object unpatching (ie, patch disablement) */
-static void post_unpatch_callback(struct klp_object *obj)
-{
- callback_info(__func__, obj);
-}
-
-static struct klp_func no_funcs[] = {
- { }
-};
-
-static struct klp_object objs[] = {
- {
- .name = NULL, /* vmlinux */
- .funcs = no_funcs,
- .callbacks = {
- .pre_patch = pre_patch_callback,
- .post_patch = post_patch_callback,
- .pre_unpatch = pre_unpatch_callback,
- .post_unpatch = post_unpatch_callback,
- },
- }, { }
-};
-
-static struct klp_patch patch = {
- .mod = THIS_MODULE,
- .objs = objs,
- /* set .replace in the init function below for demo purposes */
-};
-
-static int test_klp_callbacks_demo2_init(void)
-{
- patch.replace = replace;
- return klp_enable_patch(&patch);
-}
-
-static void test_klp_callbacks_demo2_exit(void)
-{
-}
-
-module_init(test_klp_callbacks_demo2_init);
-module_exit(test_klp_callbacks_demo2_exit);
-MODULE_LICENSE("GPL");
-MODULE_INFO(livepatch, "Y");
-MODULE_AUTHOR("Joe Lawrence <joe.lawrence@redhat.com>");
-MODULE_DESCRIPTION("Livepatch test: livepatch demo2");
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-// Copyright (C) 2018 Joe Lawrence <joe.lawrence@redhat.com>
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-
-static int test_klp_callbacks_mod_init(void)
-{
- pr_info("%s\n", __func__);
- return 0;
-}
-
-static void test_klp_callbacks_mod_exit(void)
-{
- pr_info("%s\n", __func__);
-}
-
-module_init(test_klp_callbacks_mod_init);
-module_exit(test_klp_callbacks_mod_exit);
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Joe Lawrence <joe.lawrence@redhat.com>");
-MODULE_DESCRIPTION("Livepatch test: target module");
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-// Copyright (C) 2014 Seth Jennings <sjenning@redhat.com>
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/livepatch.h>
-
-#include <linux/seq_file.h>
-static int livepatch_cmdline_proc_show(struct seq_file *m, void *v)
-{
- seq_printf(m, "%s: %s\n", THIS_MODULE->name,
- "this has been live patched");
- return 0;
-}
-
-static struct klp_func funcs[] = {
- {
- .old_name = "cmdline_proc_show",
- .new_func = livepatch_cmdline_proc_show,
- }, { }
-};
-
-static struct klp_object objs[] = {
- {
- /* name being NULL means vmlinux */
- .funcs = funcs,
- }, { }
-};
-
-static struct klp_patch patch = {
- .mod = THIS_MODULE,
- .objs = objs,
-};
-
-static int test_klp_livepatch_init(void)
-{
- return klp_enable_patch(&patch);
-}
-
-static void test_klp_livepatch_exit(void)
-{
-}
-
-module_init(test_klp_livepatch_init);
-module_exit(test_klp_livepatch_exit);
-MODULE_LICENSE("GPL");
-MODULE_INFO(livepatch, "Y");
-MODULE_AUTHOR("Seth Jennings <sjenning@redhat.com>");
-MODULE_DESCRIPTION("Livepatch test: livepatch module");
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-// Copyright (C) 2018 Joe Lawrence <joe.lawrence@redhat.com>
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/list.h>
-#include <linux/livepatch.h>
-#include <linux/slab.h>
-
-/*
- * Keep a small list of pointers so that we can print address-agnostic
- * pointer values. Use a rolling integer count to differentiate the values.
- * Ironically we could have used the shadow variable API to do this, but
- * let's not lean too heavily on the very code we're testing.
- */
-static LIST_HEAD(ptr_list);
-struct shadow_ptr {
- void *ptr;
- int id;
- struct list_head list;
-};
-
-static void free_ptr_list(void)
-{
- struct shadow_ptr *sp, *tmp_sp;
-
- list_for_each_entry_safe(sp, tmp_sp, &ptr_list, list) {
- list_del(&sp->list);
- kfree(sp);
- }
-}
-
-static int ptr_id(void *ptr)
-{
- struct shadow_ptr *sp;
- static int count;
-
- list_for_each_entry(sp, &ptr_list, list) {
- if (sp->ptr == ptr)
- return sp->id;
- }
-
- sp = kmalloc(sizeof(*sp), GFP_ATOMIC);
- if (!sp)
- return -ENOMEM;
- sp->ptr = ptr;
- sp->id = count++;
-
- list_add(&sp->list, &ptr_list);
-
- return sp->id;
-}
-
-/*
- * Shadow variable wrapper functions that echo the function and arguments
- * to the kernel log for testing verification. Don't display raw pointers,
- * but use the ptr_id() value instead.
- */
-static void *shadow_get(void *obj, unsigned long id)
-{
- int **sv;
-
- sv = klp_shadow_get(obj, id);
- pr_info("klp_%s(obj=PTR%d, id=0x%lx) = PTR%d\n",
- __func__, ptr_id(obj), id, ptr_id(sv));
-
- return sv;
-}
-
-static void *shadow_alloc(void *obj, unsigned long id, size_t size,
- gfp_t gfp_flags, klp_shadow_ctor_t ctor,
- void *ctor_data)
-{
- int **var = ctor_data;
- int **sv;
-
- sv = klp_shadow_alloc(obj, id, size, gfp_flags, ctor, var);
- pr_info("klp_%s(obj=PTR%d, id=0x%lx, size=%zx, gfp_flags=%pGg), ctor=PTR%d, ctor_data=PTR%d = PTR%d\n",
- __func__, ptr_id(obj), id, size, &gfp_flags, ptr_id(ctor),
- ptr_id(*var), ptr_id(sv));
-
- return sv;
-}
-
-static void *shadow_get_or_alloc(void *obj, unsigned long id, size_t size,
- gfp_t gfp_flags, klp_shadow_ctor_t ctor,
- void *ctor_data)
-{
- int **var = ctor_data;
- int **sv;
-
- sv = klp_shadow_get_or_alloc(obj, id, size, gfp_flags, ctor, var);
- pr_info("klp_%s(obj=PTR%d, id=0x%lx, size=%zx, gfp_flags=%pGg), ctor=PTR%d, ctor_data=PTR%d = PTR%d\n",
- __func__, ptr_id(obj), id, size, &gfp_flags, ptr_id(ctor),
- ptr_id(*var), ptr_id(sv));
-
- return sv;
-}
-
-static void shadow_free(void *obj, unsigned long id, klp_shadow_dtor_t dtor)
-{
- klp_shadow_free(obj, id, dtor);
- pr_info("klp_%s(obj=PTR%d, id=0x%lx, dtor=PTR%d)\n",
- __func__, ptr_id(obj), id, ptr_id(dtor));
-}
-
-static void shadow_free_all(unsigned long id, klp_shadow_dtor_t dtor)
-{
- klp_shadow_free_all(id, dtor);
- pr_info("klp_%s(id=0x%lx, dtor=PTR%d)\n", __func__, id, ptr_id(dtor));
-}
-
-
-/* Shadow variable constructor - remember simple pointer data */
-static int shadow_ctor(void *obj, void *shadow_data, void *ctor_data)
-{
- int **sv = shadow_data;
- int **var = ctor_data;
-
- if (!var)
- return -EINVAL;
-
- *sv = *var;
- pr_info("%s: PTR%d -> PTR%d\n", __func__, ptr_id(sv), ptr_id(*var));
-
- return 0;
-}
-
-/*
- * With more than one item to free in the list, order is not determined and
- * shadow_dtor will not be passed to shadow_free_all() which would make the
- * test fail. (see pass 6)
- */
-static void shadow_dtor(void *obj, void *shadow_data)
-{
- int **sv = shadow_data;
-
- pr_info("%s(obj=PTR%d, shadow_data=PTR%d)\n",
- __func__, ptr_id(obj), ptr_id(sv));
-}
-
-/* number of objects we simulate that need shadow vars */
-#define NUM_OBJS 3
-
-/* dynamically created obj fields have the following shadow var id values */
-#define SV_ID1 0x1234
-#define SV_ID2 0x1235
-
-/*
- * The main test case adds/removes new fields (shadow var) to each of these
- * test structure instances. The last group of fields in the struct represent
- * the idea that shadow variables may be added and removed to and from the
- * struct during execution.
- */
-struct test_object {
- /* add anything here below and avoid to define an empty struct */
- struct shadow_ptr sp;
-
- /* these represent shadow vars added and removed with SV_ID{1,2} */
- /* char nfield1; */
- /* int nfield2; */
-};
-
-static int test_klp_shadow_vars_init(void)
-{
- struct test_object objs[NUM_OBJS];
- char nfields1[NUM_OBJS], *pnfields1[NUM_OBJS], **sv1[NUM_OBJS];
- char *pndup[NUM_OBJS];
- int nfields2[NUM_OBJS], *pnfields2[NUM_OBJS], **sv2[NUM_OBJS];
- void **sv;
- int ret;
- int i;
-
- ptr_id(NULL);
-
- /*
- * With an empty shadow variable hash table, expect not to find
- * any matches.
- */
- sv = shadow_get(&objs[0], SV_ID1);
- if (!sv)
- pr_info(" got expected NULL result\n");
-
- /* pass 1: init & alloc a char+int pair of svars for each objs */
- for (i = 0; i < NUM_OBJS; i++) {
- pnfields1[i] = &nfields1[i];
- ptr_id(pnfields1[i]);
-
- if (i % 2) {
- sv1[i] = shadow_alloc(&objs[i], SV_ID1,
- sizeof(pnfields1[i]), GFP_KERNEL,
- shadow_ctor, &pnfields1[i]);
- } else {
- sv1[i] = shadow_get_or_alloc(&objs[i], SV_ID1,
- sizeof(pnfields1[i]), GFP_KERNEL,
- shadow_ctor, &pnfields1[i]);
- }
- if (!sv1[i]) {
- ret = -ENOMEM;
- goto out;
- }
-
- pnfields2[i] = &nfields2[i];
- ptr_id(pnfields2[i]);
- sv2[i] = shadow_alloc(&objs[i], SV_ID2, sizeof(pnfields2[i]),
- GFP_KERNEL, shadow_ctor, &pnfields2[i]);
- if (!sv2[i]) {
- ret = -ENOMEM;
- goto out;
- }
- }
-
- /* pass 2: verify we find allocated svars and where they point to */
- for (i = 0; i < NUM_OBJS; i++) {
- /* check the "char" svar for all objects */
- sv = shadow_get(&objs[i], SV_ID1);
- if (!sv) {
- ret = -EINVAL;
- goto out;
- }
- if ((char **)sv == sv1[i] && *sv1[i] == pnfields1[i])
- pr_info(" got expected PTR%d -> PTR%d result\n",
- ptr_id(sv1[i]), ptr_id(*sv1[i]));
-
- /* check the "int" svar for all objects */
- sv = shadow_get(&objs[i], SV_ID2);
- if (!sv) {
- ret = -EINVAL;
- goto out;
- }
- if ((int **)sv == sv2[i] && *sv2[i] == pnfields2[i])
- pr_info(" got expected PTR%d -> PTR%d result\n",
- ptr_id(sv2[i]), ptr_id(*sv2[i]));
- }
-
- /* pass 3: verify that 'get_or_alloc' returns already allocated svars */
- for (i = 0; i < NUM_OBJS; i++) {
- pndup[i] = &nfields1[i];
- ptr_id(pndup[i]);
-
- sv = shadow_get_or_alloc(&objs[i], SV_ID1, sizeof(pndup[i]),
- GFP_KERNEL, shadow_ctor, &pndup[i]);
- if (!sv) {
- ret = -EINVAL;
- goto out;
- }
- if ((char **)sv == sv1[i] && *sv1[i] == pnfields1[i])
- pr_info(" got expected PTR%d -> PTR%d result\n",
- ptr_id(sv1[i]), ptr_id(*sv1[i]));
- }
-
- /* pass 4: free <objs[*], SV_ID1> pairs of svars, verify removal */
- for (i = 0; i < NUM_OBJS; i++) {
- shadow_free(&objs[i], SV_ID1, shadow_dtor); /* 'char' pairs */
- sv = shadow_get(&objs[i], SV_ID1);
- if (!sv)
- pr_info(" got expected NULL result\n");
- }
-
- /* pass 5: check we still find <objs[*], SV_ID2> svar pairs */
- for (i = 0; i < NUM_OBJS; i++) {
- sv = shadow_get(&objs[i], SV_ID2); /* 'int' pairs */
- if (!sv) {
- ret = -EINVAL;
- goto out;
- }
- if ((int **)sv == sv2[i] && *sv2[i] == pnfields2[i])
- pr_info(" got expected PTR%d -> PTR%d result\n",
- ptr_id(sv2[i]), ptr_id(*sv2[i]));
- }
-
- /* pass 6: free all the <objs[*], SV_ID2> svar pairs too. */
- shadow_free_all(SV_ID2, NULL); /* 'int' pairs */
- for (i = 0; i < NUM_OBJS; i++) {
- sv = shadow_get(&objs[i], SV_ID2);
- if (!sv)
- pr_info(" got expected NULL result\n");
- }
-
- free_ptr_list();
-
- return 0;
-out:
- shadow_free_all(SV_ID1, NULL); /* 'char' pairs */
- shadow_free_all(SV_ID2, NULL); /* 'int' pairs */
- free_ptr_list();
-
- return ret;
-}
-
-static void test_klp_shadow_vars_exit(void)
-{
-}
-
-module_init(test_klp_shadow_vars_init);
-module_exit(test_klp_shadow_vars_exit);
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Joe Lawrence <joe.lawrence@redhat.com>");
-MODULE_DESCRIPTION("Livepatch test: shadow variables");
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-// Copyright (C) 2019 SUSE
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/slab.h>
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/printk.h>
-#include <linux/livepatch.h>
-
-#define CONSOLE_LOGLEVEL_STATE 1
-/* Version 1 does not support migration. */
-#define CONSOLE_LOGLEVEL_STATE_VERSION 1
-
-static const char *const module_state[] = {
- [MODULE_STATE_LIVE] = "[MODULE_STATE_LIVE] Normal state",
- [MODULE_STATE_COMING] = "[MODULE_STATE_COMING] Full formed, running module_init",
- [MODULE_STATE_GOING] = "[MODULE_STATE_GOING] Going away",
- [MODULE_STATE_UNFORMED] = "[MODULE_STATE_UNFORMED] Still setting it up",
-};
-
-static void callback_info(const char *callback, struct klp_object *obj)
-{
- if (obj->mod)
- pr_info("%s: %s -> %s\n", callback, obj->mod->name,
- module_state[obj->mod->state]);
- else
- pr_info("%s: vmlinux\n", callback);
-}
-
-static struct klp_patch patch;
-
-static int allocate_loglevel_state(void)
-{
- struct klp_state *loglevel_state;
-
- loglevel_state = klp_get_state(&patch, CONSOLE_LOGLEVEL_STATE);
- if (!loglevel_state)
- return -EINVAL;
-
- loglevel_state->data = kzalloc(sizeof(console_loglevel), GFP_KERNEL);
- if (!loglevel_state->data)
- return -ENOMEM;
-
- pr_info("%s: allocating space to store console_loglevel\n",
- __func__);
- return 0;
-}
-
-static void fix_console_loglevel(void)
-{
- struct klp_state *loglevel_state;
-
- loglevel_state = klp_get_state(&patch, CONSOLE_LOGLEVEL_STATE);
- if (!loglevel_state)
- return;
-
- pr_info("%s: fixing console_loglevel\n", __func__);
- *(int *)loglevel_state->data = console_loglevel;
- console_loglevel = CONSOLE_LOGLEVEL_MOTORMOUTH;
-}
-
-static void restore_console_loglevel(void)
-{
- struct klp_state *loglevel_state;
-
- loglevel_state = klp_get_state(&patch, CONSOLE_LOGLEVEL_STATE);
- if (!loglevel_state)
- return;
-
- pr_info("%s: restoring console_loglevel\n", __func__);
- console_loglevel = *(int *)loglevel_state->data;
-}
-
-static void free_loglevel_state(void)
-{
- struct klp_state *loglevel_state;
-
- loglevel_state = klp_get_state(&patch, CONSOLE_LOGLEVEL_STATE);
- if (!loglevel_state)
- return;
-
- pr_info("%s: freeing space for the stored console_loglevel\n",
- __func__);
- kfree(loglevel_state->data);
-}
-
-/* Executed on object patching (ie, patch enablement) */
-static int pre_patch_callback(struct klp_object *obj)
-{
- callback_info(__func__, obj);
- return allocate_loglevel_state();
-}
-
-/* Executed on object unpatching (ie, patch disablement) */
-static void post_patch_callback(struct klp_object *obj)
-{
- callback_info(__func__, obj);
- fix_console_loglevel();
-}
-
-/* Executed on object unpatching (ie, patch disablement) */
-static void pre_unpatch_callback(struct klp_object *obj)
-{
- callback_info(__func__, obj);
- restore_console_loglevel();
-}
-
-/* Executed on object unpatching (ie, patch disablement) */
-static void post_unpatch_callback(struct klp_object *obj)
-{
- callback_info(__func__, obj);
- free_loglevel_state();
-}
-
-static struct klp_func no_funcs[] = {
- {}
-};
-
-static struct klp_object objs[] = {
- {
- .name = NULL, /* vmlinux */
- .funcs = no_funcs,
- .callbacks = {
- .pre_patch = pre_patch_callback,
- .post_patch = post_patch_callback,
- .pre_unpatch = pre_unpatch_callback,
- .post_unpatch = post_unpatch_callback,
- },
- }, { }
-};
-
-static struct klp_state states[] = {
- {
- .id = CONSOLE_LOGLEVEL_STATE,
- .version = CONSOLE_LOGLEVEL_STATE_VERSION,
- }, { }
-};
-
-static struct klp_patch patch = {
- .mod = THIS_MODULE,
- .objs = objs,
- .states = states,
- .replace = true,
-};
-
-static int test_klp_callbacks_demo_init(void)
-{
- return klp_enable_patch(&patch);
-}
-
-static void test_klp_callbacks_demo_exit(void)
-{
-}
-
-module_init(test_klp_callbacks_demo_init);
-module_exit(test_klp_callbacks_demo_exit);
-MODULE_LICENSE("GPL");
-MODULE_INFO(livepatch, "Y");
-MODULE_AUTHOR("Petr Mladek <pmladek@suse.com>");
-MODULE_DESCRIPTION("Livepatch test: system state modification");
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-// Copyright (C) 2019 SUSE
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/slab.h>
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/printk.h>
-#include <linux/livepatch.h>
-
-#define CONSOLE_LOGLEVEL_STATE 1
-/* Version 2 supports migration. */
-#define CONSOLE_LOGLEVEL_STATE_VERSION 2
-
-static const char *const module_state[] = {
- [MODULE_STATE_LIVE] = "[MODULE_STATE_LIVE] Normal state",
- [MODULE_STATE_COMING] = "[MODULE_STATE_COMING] Full formed, running module_init",
- [MODULE_STATE_GOING] = "[MODULE_STATE_GOING] Going away",
- [MODULE_STATE_UNFORMED] = "[MODULE_STATE_UNFORMED] Still setting it up",
-};
-
-static void callback_info(const char *callback, struct klp_object *obj)
-{
- if (obj->mod)
- pr_info("%s: %s -> %s\n", callback, obj->mod->name,
- module_state[obj->mod->state]);
- else
- pr_info("%s: vmlinux\n", callback);
-}
-
-static struct klp_patch patch;
-
-static int allocate_loglevel_state(void)
-{
- struct klp_state *loglevel_state, *prev_loglevel_state;
-
- prev_loglevel_state = klp_get_prev_state(CONSOLE_LOGLEVEL_STATE);
- if (prev_loglevel_state) {
- pr_info("%s: space to store console_loglevel already allocated\n",
- __func__);
- return 0;
- }
-
- loglevel_state = klp_get_state(&patch, CONSOLE_LOGLEVEL_STATE);
- if (!loglevel_state)
- return -EINVAL;
-
- loglevel_state->data = kzalloc(sizeof(console_loglevel), GFP_KERNEL);
- if (!loglevel_state->data)
- return -ENOMEM;
-
- pr_info("%s: allocating space to store console_loglevel\n",
- __func__);
- return 0;
-}
-
-static void fix_console_loglevel(void)
-{
- struct klp_state *loglevel_state, *prev_loglevel_state;
-
- loglevel_state = klp_get_state(&patch, CONSOLE_LOGLEVEL_STATE);
- if (!loglevel_state)
- return;
-
- prev_loglevel_state = klp_get_prev_state(CONSOLE_LOGLEVEL_STATE);
- if (prev_loglevel_state) {
- pr_info("%s: taking over the console_loglevel change\n",
- __func__);
- loglevel_state->data = prev_loglevel_state->data;
- return;
- }
-
- pr_info("%s: fixing console_loglevel\n", __func__);
- *(int *)loglevel_state->data = console_loglevel;
- console_loglevel = CONSOLE_LOGLEVEL_MOTORMOUTH;
-}
-
-static void restore_console_loglevel(void)
-{
- struct klp_state *loglevel_state, *prev_loglevel_state;
-
- prev_loglevel_state = klp_get_prev_state(CONSOLE_LOGLEVEL_STATE);
- if (prev_loglevel_state) {
- pr_info("%s: passing the console_loglevel change back to the old livepatch\n",
- __func__);
- return;
- }
-
- loglevel_state = klp_get_state(&patch, CONSOLE_LOGLEVEL_STATE);
- if (!loglevel_state)
- return;
-
- pr_info("%s: restoring console_loglevel\n", __func__);
- console_loglevel = *(int *)loglevel_state->data;
-}
-
-static void free_loglevel_state(void)
-{
- struct klp_state *loglevel_state, *prev_loglevel_state;
-
- prev_loglevel_state = klp_get_prev_state(CONSOLE_LOGLEVEL_STATE);
- if (prev_loglevel_state) {
- pr_info("%s: keeping space to store console_loglevel\n",
- __func__);
- return;
- }
-
- loglevel_state = klp_get_state(&patch, CONSOLE_LOGLEVEL_STATE);
- if (!loglevel_state)
- return;
-
- pr_info("%s: freeing space for the stored console_loglevel\n",
- __func__);
- kfree(loglevel_state->data);
-}
-
-/* Executed on object patching (ie, patch enablement) */
-static int pre_patch_callback(struct klp_object *obj)
-{
- callback_info(__func__, obj);
- return allocate_loglevel_state();
-}
-
-/* Executed on object unpatching (ie, patch disablement) */
-static void post_patch_callback(struct klp_object *obj)
-{
- callback_info(__func__, obj);
- fix_console_loglevel();
-}
-
-/* Executed on object unpatching (ie, patch disablement) */
-static void pre_unpatch_callback(struct klp_object *obj)
-{
- callback_info(__func__, obj);
- restore_console_loglevel();
-}
-
-/* Executed on object unpatching (ie, patch disablement) */
-static void post_unpatch_callback(struct klp_object *obj)
-{
- callback_info(__func__, obj);
- free_loglevel_state();
-}
-
-static struct klp_func no_funcs[] = {
- {}
-};
-
-static struct klp_object objs[] = {
- {
- .name = NULL, /* vmlinux */
- .funcs = no_funcs,
- .callbacks = {
- .pre_patch = pre_patch_callback,
- .post_patch = post_patch_callback,
- .pre_unpatch = pre_unpatch_callback,
- .post_unpatch = post_unpatch_callback,
- },
- }, { }
-};
-
-static struct klp_state states[] = {
- {
- .id = CONSOLE_LOGLEVEL_STATE,
- .version = CONSOLE_LOGLEVEL_STATE_VERSION,
- }, { }
-};
-
-static struct klp_patch patch = {
- .mod = THIS_MODULE,
- .objs = objs,
- .states = states,
- .replace = true,
-};
-
-static int test_klp_callbacks_demo_init(void)
-{
- return klp_enable_patch(&patch);
-}
-
-static void test_klp_callbacks_demo_exit(void)
-{
-}
-
-module_init(test_klp_callbacks_demo_init);
-module_exit(test_klp_callbacks_demo_exit);
-MODULE_LICENSE("GPL");
-MODULE_INFO(livepatch, "Y");
-MODULE_AUTHOR("Petr Mladek <pmladek@suse.com>");
-MODULE_DESCRIPTION("Livepatch test: system state modification");
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-// Copyright (C) 2019 SUSE
-
-/* The console loglevel fix is the same in the next cumulative patch. */
-#include "test_klp_state2.c"
# SPDX-License-Identifier: GPL-2.0
+TEST_GEN_MODS_DIR := test_modules
TEST_PROGS_EXTENDED := functions.sh
TEST_PROGS := \
test-livepatch.sh \
Config
------
-Set these config options and their prerequisites:
+Set CONFIG_LIVEPATCH=y option and it's prerequisites.
-CONFIG_LIVEPATCH=y
-CONFIG_TEST_LIVEPATCH=m
+Building the tests
+------------------
+
+To only build the tests without running them, run:
+
+ % make -C tools/testing/selftests/livepatch
+
+The command above will compile all test modules and test programs, making them
+ready to be packaged if so desired.
Running the tests
-----------------
-Test kernel modules are built as part of lib/ (make modules) and need to
-be installed (make modules_install) as the test scripts will modprobe
-them.
+Test kernel modules are built before running the livepatch selftests. The
+modules are located under test_modules directory, and are built as out-of-tree
+modules. This is specially useful since the same sources can be built and
+tested on systems with different kABI, ensuring they the tests are backwards
+compatible. The modules will be loaded by the test scripts using insmod.
To run the livepatch selftests, from the top of the kernel source tree:
% make -C tools/testing/selftests TARGETS=livepatch run_tests
+or
+
+ % make kselftest TARGETS=livepatch
+
Adding tests
------------
CONFIG_LIVEPATCH=y
CONFIG_DYNAMIC_DEBUG=y
-CONFIG_TEST_LIVEPATCH=m
done
}
-function assert_mod() {
- local mod="$1"
-
- modprobe --dry-run "$mod" &>/dev/null
-}
-
function is_livepatch_mod() {
local mod="$1"
- if [[ $(modinfo "$mod" | awk '/^livepatch:/{print $NF}') == "Y" ]]; then
+ if [[ ! -f "test_modules/$mod.ko" ]]; then
+ die "Can't find \"test_modules/$mod.ko\", try \"make\""
+ fi
+
+ if [[ $(modinfo "test_modules/$mod.ko" | awk '/^livepatch:/{print $NF}') == "Y" ]]; then
return 0
fi
function __load_mod() {
local mod="$1"; shift
- local msg="% modprobe $mod $*"
+ local msg="% insmod test_modules/$mod.ko $*"
log "${msg%% }"
- ret=$(modprobe "$mod" "$@" 2>&1)
+ ret=$(insmod "test_modules/$mod.ko" "$@" 2>&1)
if [[ "$ret" != "" ]]; then
die "$ret"
fi
# load_mod(modname, params) - load a kernel module
# modname - module name to load
-# params - module parameters to pass to modprobe
+# params - module parameters to pass to insmod
function load_mod() {
local mod="$1"; shift
- assert_mod "$mod" ||
- skip "unable to load module ${mod}, verify CONFIG_TEST_LIVEPATCH=m and run self-tests as root"
-
is_livepatch_mod "$mod" &&
die "use load_lp() to load the livepatch module $mod"
# 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
+# params - module parameters to pass to insmod
function load_lp_nowait() {
local mod="$1"; shift
- assert_mod "$mod" ||
- skip "unable to load module ${mod}, verify CONFIG_TEST_LIVEPATCH=m and run self-tests as root"
-
is_livepatch_mod "$mod" ||
die "module $mod is not a livepatch"
# load_lp(modname, params) - load a kernel module with a livepatch
# modname - module name to load
-# params - module parameters to pass to modprobe
+# params - module parameters to pass to insmod
function load_lp() {
local mod="$1"; shift
# load_failing_mod(modname, params) - load a kernel module, expect to fail
# modname - module name to load
-# params - module parameters to pass to modprobe
+# params - module parameters to pass to insmod
function load_failing_mod() {
local mod="$1"; shift
- local msg="% modprobe $mod $*"
+ local msg="% insmod test_modules/$mod.ko $*"
log "${msg%% }"
- ret=$(modprobe "$mod" "$@" 2>&1)
+ ret=$(insmod "test_modules/$mod.ko" "$@" 2>&1)
if [[ "$ret" == "" ]]; then
die "$mod unexpectedly loaded"
fi
unload_lp $MOD_LIVEPATCH
unload_mod $MOD_TARGET
-check_result "% modprobe $MOD_TARGET
+check_result "% insmod test_modules/$MOD_TARGET.ko
$MOD_TARGET: ${MOD_TARGET}_init
-% modprobe $MOD_LIVEPATCH
+% insmod test_modules/$MOD_LIVEPATCH.ko
livepatch: enabling patch '$MOD_LIVEPATCH'
livepatch: '$MOD_LIVEPATCH': initializing patching transition
$MOD_LIVEPATCH: pre_patch_callback: vmlinux
unload_lp $MOD_LIVEPATCH
unload_mod $MOD_TARGET
-check_result "% modprobe $MOD_LIVEPATCH
+check_result "% insmod test_modules/$MOD_LIVEPATCH.ko
livepatch: enabling patch '$MOD_LIVEPATCH'
livepatch: '$MOD_LIVEPATCH': initializing patching transition
$MOD_LIVEPATCH: pre_patch_callback: vmlinux
livepatch: '$MOD_LIVEPATCH': completing patching transition
$MOD_LIVEPATCH: post_patch_callback: vmlinux
livepatch: '$MOD_LIVEPATCH': patching complete
-% modprobe $MOD_TARGET
+% insmod test_modules/$MOD_TARGET.ko
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
disable_lp $MOD_LIVEPATCH
unload_lp $MOD_LIVEPATCH
-check_result "% modprobe $MOD_TARGET
+check_result "% insmod test_modules/$MOD_TARGET.ko
$MOD_TARGET: ${MOD_TARGET}_init
-% modprobe $MOD_LIVEPATCH
+% insmod test_modules/$MOD_LIVEPATCH.ko
livepatch: enabling patch '$MOD_LIVEPATCH'
livepatch: '$MOD_LIVEPATCH': initializing patching transition
$MOD_LIVEPATCH: pre_patch_callback: vmlinux
disable_lp $MOD_LIVEPATCH
unload_lp $MOD_LIVEPATCH
-check_result "% modprobe $MOD_LIVEPATCH
+check_result "% insmod test_modules/$MOD_LIVEPATCH.ko
livepatch: enabling patch '$MOD_LIVEPATCH'
livepatch: '$MOD_LIVEPATCH': initializing patching transition
$MOD_LIVEPATCH: pre_patch_callback: vmlinux
livepatch: '$MOD_LIVEPATCH': completing patching transition
$MOD_LIVEPATCH: post_patch_callback: vmlinux
livepatch: '$MOD_LIVEPATCH': patching complete
-% modprobe $MOD_TARGET
+% insmod test_modules/$MOD_TARGET.ko
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
disable_lp $MOD_LIVEPATCH
unload_lp $MOD_LIVEPATCH
-check_result "% modprobe $MOD_LIVEPATCH
+check_result "% insmod test_modules/$MOD_LIVEPATCH.ko
livepatch: enabling patch '$MOD_LIVEPATCH'
livepatch: '$MOD_LIVEPATCH': initializing patching transition
$MOD_LIVEPATCH: pre_patch_callback: vmlinux
load_failing_mod $MOD_LIVEPATCH pre_patch_ret=-19
unload_mod $MOD_TARGET
-check_result "% modprobe $MOD_TARGET
+check_result "% insmod test_modules/$MOD_TARGET.ko
$MOD_TARGET: ${MOD_TARGET}_init
-% modprobe $MOD_LIVEPATCH pre_patch_ret=-19
+% insmod test_modules/$MOD_LIVEPATCH.ko pre_patch_ret=-19
livepatch: enabling patch '$MOD_LIVEPATCH'
livepatch: '$MOD_LIVEPATCH': initializing patching transition
test_klp_callbacks_demo: pre_patch_callback: vmlinux
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
+insmod: ERROR: could not insert module test_modules/$MOD_LIVEPATCH.ko: No such device
% rmmod $MOD_TARGET
$MOD_TARGET: ${MOD_TARGET}_exit"
disable_lp $MOD_LIVEPATCH
unload_lp $MOD_LIVEPATCH
-check_result "% modprobe $MOD_LIVEPATCH
+check_result "% insmod test_modules/$MOD_LIVEPATCH.ko
livepatch: enabling patch '$MOD_LIVEPATCH'
livepatch: '$MOD_LIVEPATCH': initializing patching transition
$MOD_LIVEPATCH: pre_patch_callback: vmlinux
$MOD_LIVEPATCH: post_patch_callback: vmlinux
livepatch: '$MOD_LIVEPATCH': patching complete
% echo -19 > /sys/module/$MOD_LIVEPATCH/parameters/pre_patch_ret
-% modprobe $MOD_TARGET
+% insmod test_modules/$MOD_TARGET.ko
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
+insmod: ERROR: could not insert module test_modules/$MOD_TARGET.ko: No such device
% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
$MOD_LIVEPATCH: pre_unpatch_callback: vmlinux
unload_lp $MOD_LIVEPATCH
unload_mod $MOD_TARGET_BUSY
-check_result "% modprobe $MOD_TARGET_BUSY block_transition=N
+check_result "% insmod test_modules/$MOD_TARGET_BUSY.ko 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 $MOD_LIVEPATCH
+% insmod test_modules/$MOD_LIVEPATCH.ko
livepatch: enabling patch '$MOD_LIVEPATCH'
livepatch: '$MOD_LIVEPATCH': initializing patching transition
$MOD_LIVEPATCH: pre_patch_callback: vmlinux
$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 $MOD_TARGET
+% insmod test_modules/$MOD_TARGET.ko
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
unload_lp $MOD_LIVEPATCH
unload_mod $MOD_TARGET_BUSY
-check_result "% modprobe $MOD_TARGET_BUSY block_transition=Y
+check_result "% insmod test_modules/$MOD_TARGET_BUSY.ko block_transition=Y
$MOD_TARGET_BUSY: ${MOD_TARGET_BUSY}_init
$MOD_TARGET_BUSY: busymod_work_func enter
-% modprobe $MOD_LIVEPATCH
+% insmod test_modules/$MOD_LIVEPATCH.ko
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 $MOD_TARGET
+% insmod test_modules/$MOD_TARGET.ko
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
unload_lp $MOD_LIVEPATCH2
unload_lp $MOD_LIVEPATCH
-check_result "% modprobe $MOD_LIVEPATCH
+check_result "% insmod test_modules/$MOD_LIVEPATCH.ko
livepatch: enabling patch '$MOD_LIVEPATCH'
livepatch: '$MOD_LIVEPATCH': initializing patching transition
$MOD_LIVEPATCH: pre_patch_callback: vmlinux
livepatch: '$MOD_LIVEPATCH': completing patching transition
$MOD_LIVEPATCH: post_patch_callback: vmlinux
livepatch: '$MOD_LIVEPATCH': patching complete
-% modprobe $MOD_LIVEPATCH2
+% insmod test_modules/$MOD_LIVEPATCH2.ko
livepatch: enabling patch '$MOD_LIVEPATCH2'
livepatch: '$MOD_LIVEPATCH2': initializing patching transition
$MOD_LIVEPATCH2: pre_patch_callback: vmlinux
unload_lp $MOD_LIVEPATCH2
unload_lp $MOD_LIVEPATCH
-check_result "% modprobe $MOD_LIVEPATCH
+check_result "% insmod test_modules/$MOD_LIVEPATCH.ko
livepatch: enabling patch '$MOD_LIVEPATCH'
livepatch: '$MOD_LIVEPATCH': initializing patching transition
$MOD_LIVEPATCH: pre_patch_callback: vmlinux
livepatch: '$MOD_LIVEPATCH': completing patching transition
$MOD_LIVEPATCH: post_patch_callback: vmlinux
livepatch: '$MOD_LIVEPATCH': patching complete
-% modprobe $MOD_LIVEPATCH2 replace=1
+% insmod test_modules/$MOD_LIVEPATCH2.ko replace=1
livepatch: enabling patch '$MOD_LIVEPATCH2'
livepatch: '$MOD_LIVEPATCH2': initializing patching transition
$MOD_LIVEPATCH2: pre_patch_callback: vmlinux
unload_lp $MOD_LIVEPATCH
check_result "livepatch: kernel.ftrace_enabled = 0
-% modprobe $MOD_LIVEPATCH
+% insmod test_modules/$MOD_LIVEPATCH.ko
livepatch: enabling patch '$MOD_LIVEPATCH'
livepatch: '$MOD_LIVEPATCH': initializing patching transition
livepatch: failed to register ftrace handler for function 'cmdline_proc_show' (-16)
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': Device or resource busy
+insmod: ERROR: could not insert module test_modules/$MOD_LIVEPATCH.ko: Device or resource busy
livepatch: kernel.ftrace_enabled = 1
-% modprobe $MOD_LIVEPATCH
+% insmod test_modules/$MOD_LIVEPATCH.ko
livepatch: enabling patch '$MOD_LIVEPATCH'
livepatch: '$MOD_LIVEPATCH': initializing patching transition
livepatch: '$MOD_LIVEPATCH': starting patching transition
die "livepatch kselftest(s) failed"
fi
-check_result "% modprobe $MOD_LIVEPATCH
+check_result "% insmod test_modules/$MOD_LIVEPATCH.ko
livepatch: enabling patch '$MOD_LIVEPATCH'
livepatch: '$MOD_LIVEPATCH': initializing patching transition
livepatch: '$MOD_LIVEPATCH': starting patching transition
grep 'live patched' /proc/cmdline > /dev/kmsg
grep 'live patched' /proc/meminfo > /dev/kmsg
-check_result "% modprobe $MOD_LIVEPATCH
+check_result "% insmod test_modules/$MOD_LIVEPATCH.ko
livepatch: enabling patch '$MOD_LIVEPATCH'
livepatch: '$MOD_LIVEPATCH': initializing patching transition
livepatch: '$MOD_LIVEPATCH': starting patching transition
livepatch: '$MOD_LIVEPATCH': completing patching transition
livepatch: '$MOD_LIVEPATCH': patching complete
$MOD_LIVEPATCH: this has been live patched
-% modprobe $MOD_REPLACE replace=0
+% insmod test_modules/$MOD_REPLACE.ko replace=0
livepatch: enabling patch '$MOD_REPLACE'
livepatch: '$MOD_REPLACE': initializing patching transition
livepatch: '$MOD_REPLACE': starting patching transition
grep 'live patched' /proc/cmdline > /dev/kmsg
grep 'live patched' /proc/meminfo > /dev/kmsg
-check_result "% modprobe $MOD_LIVEPATCH
+check_result "% insmod test_modules/$MOD_LIVEPATCH.ko
livepatch: enabling patch '$MOD_LIVEPATCH'
livepatch: '$MOD_LIVEPATCH': initializing patching transition
livepatch: '$MOD_LIVEPATCH': starting patching transition
livepatch: '$MOD_LIVEPATCH': completing patching transition
livepatch: '$MOD_LIVEPATCH': patching complete
$MOD_LIVEPATCH: this has been live patched
-% modprobe $MOD_REPLACE replace=1
+% insmod test_modules/$MOD_REPLACE.ko replace=1
livepatch: enabling patch '$MOD_REPLACE'
livepatch: '$MOD_REPLACE': initializing patching transition
livepatch: '$MOD_REPLACE': starting patching transition
load_mod $MOD_TEST
unload_mod $MOD_TEST
-check_result "% modprobe $MOD_TEST
+check_result "% insmod test_modules/$MOD_TEST.ko
$MOD_TEST: klp_shadow_get(obj=PTR1, id=0x1234) = PTR0
$MOD_TEST: got expected NULL result
$MOD_TEST: shadow_ctor: PTR3 -> PTR2
disable_lp $MOD_LIVEPATCH
unload_lp $MOD_LIVEPATCH
-check_result "% modprobe $MOD_LIVEPATCH
+check_result "% insmod test_modules/$MOD_LIVEPATCH.ko
livepatch: enabling patch '$MOD_LIVEPATCH'
livepatch: '$MOD_LIVEPATCH': initializing patching transition
$MOD_LIVEPATCH: pre_patch_callback: vmlinux
disable_lp $MOD_LIVEPATCH2
unload_lp $MOD_LIVEPATCH2
-check_result "% modprobe $MOD_LIVEPATCH
+check_result "% insmod test_modules/$MOD_LIVEPATCH.ko
livepatch: enabling patch '$MOD_LIVEPATCH'
livepatch: '$MOD_LIVEPATCH': initializing patching transition
$MOD_LIVEPATCH: pre_patch_callback: vmlinux
$MOD_LIVEPATCH: post_patch_callback: vmlinux
$MOD_LIVEPATCH: fix_console_loglevel: fixing console_loglevel
livepatch: '$MOD_LIVEPATCH': patching complete
-% modprobe $MOD_LIVEPATCH2
+% insmod test_modules/$MOD_LIVEPATCH2.ko
livepatch: enabling patch '$MOD_LIVEPATCH2'
livepatch: '$MOD_LIVEPATCH2': initializing patching transition
$MOD_LIVEPATCH2: pre_patch_callback: vmlinux
unload_lp $MOD_LIVEPATCH2
unload_lp $MOD_LIVEPATCH3
-check_result "% modprobe $MOD_LIVEPATCH2
+check_result "% insmod test_modules/$MOD_LIVEPATCH2.ko
livepatch: enabling patch '$MOD_LIVEPATCH2'
livepatch: '$MOD_LIVEPATCH2': initializing patching transition
$MOD_LIVEPATCH2: pre_patch_callback: vmlinux
$MOD_LIVEPATCH2: post_patch_callback: vmlinux
$MOD_LIVEPATCH2: fix_console_loglevel: fixing console_loglevel
livepatch: '$MOD_LIVEPATCH2': patching complete
-% modprobe $MOD_LIVEPATCH3
+% insmod test_modules/$MOD_LIVEPATCH3.ko
livepatch: enabling patch '$MOD_LIVEPATCH3'
livepatch: '$MOD_LIVEPATCH3': initializing patching transition
$MOD_LIVEPATCH3: pre_patch_callback: vmlinux
$MOD_LIVEPATCH3: fix_console_loglevel: taking over the console_loglevel change
livepatch: '$MOD_LIVEPATCH3': patching complete
% rmmod $MOD_LIVEPATCH2
-% modprobe $MOD_LIVEPATCH2
+% insmod test_modules/$MOD_LIVEPATCH2.ko
livepatch: enabling patch '$MOD_LIVEPATCH2'
livepatch: '$MOD_LIVEPATCH2': initializing patching transition
$MOD_LIVEPATCH2: pre_patch_callback: vmlinux
disable_lp $MOD_LIVEPATCH2
unload_lp $MOD_LIVEPATCH2
-check_result "% modprobe $MOD_LIVEPATCH2
+check_result "% insmod test_modules/$MOD_LIVEPATCH2.ko
livepatch: enabling patch '$MOD_LIVEPATCH2'
livepatch: '$MOD_LIVEPATCH2': initializing patching transition
$MOD_LIVEPATCH2: pre_patch_callback: vmlinux
$MOD_LIVEPATCH2: post_patch_callback: vmlinux
$MOD_LIVEPATCH2: fix_console_loglevel: fixing console_loglevel
livepatch: '$MOD_LIVEPATCH2': patching complete
-% modprobe $MOD_LIVEPATCH
+% insmod test_modules/$MOD_LIVEPATCH.ko
livepatch: Livepatch patch ($MOD_LIVEPATCH) is not compatible with the already installed livepatches.
-modprobe: ERROR: could not insert '$MOD_LIVEPATCH': Invalid argument
+insmod: ERROR: could not insert module test_modules/$MOD_LIVEPATCH.ko: Invalid parameters
% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH2/enabled
livepatch: '$MOD_LIVEPATCH2': initializing unpatching transition
$MOD_LIVEPATCH2: pre_unpatch_callback: vmlinux
unload_lp $MOD_LIVEPATCH
-check_result "% modprobe $MOD_LIVEPATCH
+check_result "% insmod test_modules/$MOD_LIVEPATCH.ko
livepatch: enabling patch '$MOD_LIVEPATCH'
livepatch: '$MOD_LIVEPATCH': initializing patching transition
livepatch: '$MOD_LIVEPATCH': starting patching transition
disable_lp $MOD_LIVEPATCH
unload_lp $MOD_LIVEPATCH
-check_result "% modprobe test_klp_callbacks_demo
+check_result "% insmod test_modules/test_klp_callbacks_demo.ko
livepatch: enabling patch 'test_klp_callbacks_demo'
livepatch: 'test_klp_callbacks_demo': initializing patching transition
test_klp_callbacks_demo: pre_patch_callback: vmlinux
livepatch: 'test_klp_callbacks_demo': completing patching transition
test_klp_callbacks_demo: post_patch_callback: vmlinux
livepatch: 'test_klp_callbacks_demo': patching complete
-% modprobe test_klp_callbacks_mod
+% insmod test_modules/test_klp_callbacks_mod.ko
livepatch: applying patch 'test_klp_callbacks_demo' to loading module 'test_klp_callbacks_mod'
test_klp_callbacks_demo: pre_patch_callback: test_klp_callbacks_mod -> [MODULE_STATE_COMING] Full formed, running module_init
test_klp_callbacks_demo: post_patch_callback: test_klp_callbacks_mod -> [MODULE_STATE_COMING] Full formed, running module_init
--- /dev/null
+TESTMODS_DIR := $(realpath $(dir $(abspath $(lastword $(MAKEFILE_LIST)))))
+KDIR ?= /lib/modules/$(shell uname -r)/build
+
+obj-m += test_klp_atomic_replace.o \
+ test_klp_callbacks_busy.o \
+ test_klp_callbacks_demo.o \
+ test_klp_callbacks_demo2.o \
+ test_klp_callbacks_mod.o \
+ test_klp_livepatch.o \
+ test_klp_state.o \
+ test_klp_state2.o \
+ test_klp_state3.o \
+ test_klp_shadow_vars.o
+
+modules:
+ $(Q)$(MAKE) -C $(KDIR) modules KBUILD_EXTMOD=$(TESTMODS_DIR)
+
+clean:
+ $(Q)$(MAKE) -C $(KDIR) clean KBUILD_EXTMOD=$(TESTMODS_DIR)
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Joe Lawrence <joe.lawrence@redhat.com>
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/livepatch.h>
+
+static int replace;
+module_param(replace, int, 0644);
+MODULE_PARM_DESC(replace, "replace (default=0)");
+
+#include <linux/seq_file.h>
+static int livepatch_meminfo_proc_show(struct seq_file *m, void *v)
+{
+ seq_printf(m, "%s: %s\n", THIS_MODULE->name,
+ "this has been live patched");
+ return 0;
+}
+
+static struct klp_func funcs[] = {
+ {
+ .old_name = "meminfo_proc_show",
+ .new_func = livepatch_meminfo_proc_show,
+ }, {}
+};
+
+static struct klp_object objs[] = {
+ {
+ /* name being NULL means vmlinux */
+ .funcs = funcs,
+ }, {}
+};
+
+static struct klp_patch patch = {
+ .mod = THIS_MODULE,
+ .objs = objs,
+ /* set .replace in the init function below for demo purposes */
+};
+
+static int test_klp_atomic_replace_init(void)
+{
+ patch.replace = replace;
+ return klp_enable_patch(&patch);
+}
+
+static void test_klp_atomic_replace_exit(void)
+{
+}
+
+module_init(test_klp_atomic_replace_init);
+module_exit(test_klp_atomic_replace_exit);
+MODULE_LICENSE("GPL");
+MODULE_INFO(livepatch, "Y");
+MODULE_AUTHOR("Joe Lawrence <joe.lawrence@redhat.com>");
+MODULE_DESCRIPTION("Livepatch test: atomic replace");
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Joe Lawrence <joe.lawrence@redhat.com>
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/workqueue.h>
+#include <linux/delay.h>
+
+/* load/run-time control from sysfs writer */
+static bool block_transition;
+module_param(block_transition, bool, 0644);
+MODULE_PARM_DESC(block_transition, "block_transition (default=false)");
+
+static void busymod_work_func(struct work_struct *work);
+static DECLARE_WORK(work, busymod_work_func);
+static DECLARE_COMPLETION(busymod_work_started);
+
+static void busymod_work_func(struct work_struct *work)
+{
+ pr_info("%s enter\n", __func__);
+ complete(&busymod_work_started);
+
+ while (READ_ONCE(block_transition)) {
+ /*
+ * Busy-wait until the sysfs writer has acknowledged a
+ * blocked transition and clears the flag.
+ */
+ msleep(20);
+ }
+
+ pr_info("%s exit\n", __func__);
+}
+
+static int test_klp_callbacks_busy_init(void)
+{
+ pr_info("%s\n", __func__);
+ schedule_work(&work);
+
+ /*
+ * To synchronize kernel messages, hold the init function from
+ * exiting until the work function's entry message has printed.
+ */
+ wait_for_completion(&busymod_work_started);
+
+ if (!block_transition) {
+ /*
+ * Serialize output: print all messages from the work
+ * function before returning from init().
+ */
+ flush_work(&work);
+ }
+
+ return 0;
+}
+
+static void test_klp_callbacks_busy_exit(void)
+{
+ WRITE_ONCE(block_transition, false);
+ flush_work(&work);
+ pr_info("%s\n", __func__);
+}
+
+module_init(test_klp_callbacks_busy_init);
+module_exit(test_klp_callbacks_busy_exit);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Joe Lawrence <joe.lawrence@redhat.com>");
+MODULE_DESCRIPTION("Livepatch test: busy target module");
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Joe Lawrence <joe.lawrence@redhat.com>
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/livepatch.h>
+
+static int pre_patch_ret;
+module_param(pre_patch_ret, int, 0644);
+MODULE_PARM_DESC(pre_patch_ret, "pre_patch_ret (default=0)");
+
+static const char *const module_state[] = {
+ [MODULE_STATE_LIVE] = "[MODULE_STATE_LIVE] Normal state",
+ [MODULE_STATE_COMING] = "[MODULE_STATE_COMING] Full formed, running module_init",
+ [MODULE_STATE_GOING] = "[MODULE_STATE_GOING] Going away",
+ [MODULE_STATE_UNFORMED] = "[MODULE_STATE_UNFORMED] Still setting it up",
+};
+
+static void callback_info(const char *callback, struct klp_object *obj)
+{
+ if (obj->mod)
+ pr_info("%s: %s -> %s\n", callback, obj->mod->name,
+ module_state[obj->mod->state]);
+ else
+ pr_info("%s: vmlinux\n", callback);
+}
+
+/* Executed on object patching (ie, patch enablement) */
+static int pre_patch_callback(struct klp_object *obj)
+{
+ callback_info(__func__, obj);
+ return pre_patch_ret;
+}
+
+/* Executed on object unpatching (ie, patch disablement) */
+static void post_patch_callback(struct klp_object *obj)
+{
+ callback_info(__func__, obj);
+}
+
+/* Executed on object unpatching (ie, patch disablement) */
+static void pre_unpatch_callback(struct klp_object *obj)
+{
+ callback_info(__func__, obj);
+}
+
+/* Executed on object unpatching (ie, patch disablement) */
+static void post_unpatch_callback(struct klp_object *obj)
+{
+ callback_info(__func__, obj);
+}
+
+static void patched_work_func(struct work_struct *work)
+{
+ pr_info("%s\n", __func__);
+}
+
+static struct klp_func no_funcs[] = {
+ {}
+};
+
+static struct klp_func busymod_funcs[] = {
+ {
+ .old_name = "busymod_work_func",
+ .new_func = patched_work_func,
+ }, {}
+};
+
+static struct klp_object objs[] = {
+ {
+ .name = NULL, /* vmlinux */
+ .funcs = no_funcs,
+ .callbacks = {
+ .pre_patch = pre_patch_callback,
+ .post_patch = post_patch_callback,
+ .pre_unpatch = pre_unpatch_callback,
+ .post_unpatch = post_unpatch_callback,
+ },
+ }, {
+ .name = "test_klp_callbacks_mod",
+ .funcs = no_funcs,
+ .callbacks = {
+ .pre_patch = pre_patch_callback,
+ .post_patch = post_patch_callback,
+ .pre_unpatch = pre_unpatch_callback,
+ .post_unpatch = post_unpatch_callback,
+ },
+ }, {
+ .name = "test_klp_callbacks_busy",
+ .funcs = busymod_funcs,
+ .callbacks = {
+ .pre_patch = pre_patch_callback,
+ .post_patch = post_patch_callback,
+ .pre_unpatch = pre_unpatch_callback,
+ .post_unpatch = post_unpatch_callback,
+ },
+ }, { }
+};
+
+static struct klp_patch patch = {
+ .mod = THIS_MODULE,
+ .objs = objs,
+};
+
+static int test_klp_callbacks_demo_init(void)
+{
+ return klp_enable_patch(&patch);
+}
+
+static void test_klp_callbacks_demo_exit(void)
+{
+}
+
+module_init(test_klp_callbacks_demo_init);
+module_exit(test_klp_callbacks_demo_exit);
+MODULE_LICENSE("GPL");
+MODULE_INFO(livepatch, "Y");
+MODULE_AUTHOR("Joe Lawrence <joe.lawrence@redhat.com>");
+MODULE_DESCRIPTION("Livepatch test: livepatch demo");
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Joe Lawrence <joe.lawrence@redhat.com>
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/livepatch.h>
+
+static int replace;
+module_param(replace, int, 0644);
+MODULE_PARM_DESC(replace, "replace (default=0)");
+
+static const char *const module_state[] = {
+ [MODULE_STATE_LIVE] = "[MODULE_STATE_LIVE] Normal state",
+ [MODULE_STATE_COMING] = "[MODULE_STATE_COMING] Full formed, running module_init",
+ [MODULE_STATE_GOING] = "[MODULE_STATE_GOING] Going away",
+ [MODULE_STATE_UNFORMED] = "[MODULE_STATE_UNFORMED] Still setting it up",
+};
+
+static void callback_info(const char *callback, struct klp_object *obj)
+{
+ if (obj->mod)
+ pr_info("%s: %s -> %s\n", callback, obj->mod->name,
+ module_state[obj->mod->state]);
+ else
+ pr_info("%s: vmlinux\n", callback);
+}
+
+/* Executed on object patching (ie, patch enablement) */
+static int pre_patch_callback(struct klp_object *obj)
+{
+ callback_info(__func__, obj);
+ return 0;
+}
+
+/* Executed on object unpatching (ie, patch disablement) */
+static void post_patch_callback(struct klp_object *obj)
+{
+ callback_info(__func__, obj);
+}
+
+/* Executed on object unpatching (ie, patch disablement) */
+static void pre_unpatch_callback(struct klp_object *obj)
+{
+ callback_info(__func__, obj);
+}
+
+/* Executed on object unpatching (ie, patch disablement) */
+static void post_unpatch_callback(struct klp_object *obj)
+{
+ callback_info(__func__, obj);
+}
+
+static struct klp_func no_funcs[] = {
+ { }
+};
+
+static struct klp_object objs[] = {
+ {
+ .name = NULL, /* vmlinux */
+ .funcs = no_funcs,
+ .callbacks = {
+ .pre_patch = pre_patch_callback,
+ .post_patch = post_patch_callback,
+ .pre_unpatch = pre_unpatch_callback,
+ .post_unpatch = post_unpatch_callback,
+ },
+ }, { }
+};
+
+static struct klp_patch patch = {
+ .mod = THIS_MODULE,
+ .objs = objs,
+ /* set .replace in the init function below for demo purposes */
+};
+
+static int test_klp_callbacks_demo2_init(void)
+{
+ patch.replace = replace;
+ return klp_enable_patch(&patch);
+}
+
+static void test_klp_callbacks_demo2_exit(void)
+{
+}
+
+module_init(test_klp_callbacks_demo2_init);
+module_exit(test_klp_callbacks_demo2_exit);
+MODULE_LICENSE("GPL");
+MODULE_INFO(livepatch, "Y");
+MODULE_AUTHOR("Joe Lawrence <joe.lawrence@redhat.com>");
+MODULE_DESCRIPTION("Livepatch test: livepatch demo2");
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Joe Lawrence <joe.lawrence@redhat.com>
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+
+static int test_klp_callbacks_mod_init(void)
+{
+ pr_info("%s\n", __func__);
+ return 0;
+}
+
+static void test_klp_callbacks_mod_exit(void)
+{
+ pr_info("%s\n", __func__);
+}
+
+module_init(test_klp_callbacks_mod_init);
+module_exit(test_klp_callbacks_mod_exit);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Joe Lawrence <joe.lawrence@redhat.com>");
+MODULE_DESCRIPTION("Livepatch test: target module");
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2014 Seth Jennings <sjenning@redhat.com>
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/livepatch.h>
+
+#include <linux/seq_file.h>
+static int livepatch_cmdline_proc_show(struct seq_file *m, void *v)
+{
+ seq_printf(m, "%s: %s\n", THIS_MODULE->name,
+ "this has been live patched");
+ return 0;
+}
+
+static struct klp_func funcs[] = {
+ {
+ .old_name = "cmdline_proc_show",
+ .new_func = livepatch_cmdline_proc_show,
+ }, { }
+};
+
+static struct klp_object objs[] = {
+ {
+ /* name being NULL means vmlinux */
+ .funcs = funcs,
+ }, { }
+};
+
+static struct klp_patch patch = {
+ .mod = THIS_MODULE,
+ .objs = objs,
+};
+
+static int test_klp_livepatch_init(void)
+{
+ return klp_enable_patch(&patch);
+}
+
+static void test_klp_livepatch_exit(void)
+{
+}
+
+module_init(test_klp_livepatch_init);
+module_exit(test_klp_livepatch_exit);
+MODULE_LICENSE("GPL");
+MODULE_INFO(livepatch, "Y");
+MODULE_AUTHOR("Seth Jennings <sjenning@redhat.com>");
+MODULE_DESCRIPTION("Livepatch test: livepatch module");
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Joe Lawrence <joe.lawrence@redhat.com>
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/livepatch.h>
+#include <linux/slab.h>
+
+/*
+ * Keep a small list of pointers so that we can print address-agnostic
+ * pointer values. Use a rolling integer count to differentiate the values.
+ * Ironically we could have used the shadow variable API to do this, but
+ * let's not lean too heavily on the very code we're testing.
+ */
+static LIST_HEAD(ptr_list);
+struct shadow_ptr {
+ void *ptr;
+ int id;
+ struct list_head list;
+};
+
+static void free_ptr_list(void)
+{
+ struct shadow_ptr *sp, *tmp_sp;
+
+ list_for_each_entry_safe(sp, tmp_sp, &ptr_list, list) {
+ list_del(&sp->list);
+ kfree(sp);
+ }
+}
+
+static int ptr_id(void *ptr)
+{
+ struct shadow_ptr *sp;
+ static int count;
+
+ list_for_each_entry(sp, &ptr_list, list) {
+ if (sp->ptr == ptr)
+ return sp->id;
+ }
+
+ sp = kmalloc(sizeof(*sp), GFP_ATOMIC);
+ if (!sp)
+ return -ENOMEM;
+ sp->ptr = ptr;
+ sp->id = count++;
+
+ list_add(&sp->list, &ptr_list);
+
+ return sp->id;
+}
+
+/*
+ * Shadow variable wrapper functions that echo the function and arguments
+ * to the kernel log for testing verification. Don't display raw pointers,
+ * but use the ptr_id() value instead.
+ */
+static void *shadow_get(void *obj, unsigned long id)
+{
+ int **sv;
+
+ sv = klp_shadow_get(obj, id);
+ pr_info("klp_%s(obj=PTR%d, id=0x%lx) = PTR%d\n",
+ __func__, ptr_id(obj), id, ptr_id(sv));
+
+ return sv;
+}
+
+static void *shadow_alloc(void *obj, unsigned long id, size_t size,
+ gfp_t gfp_flags, klp_shadow_ctor_t ctor,
+ void *ctor_data)
+{
+ int **var = ctor_data;
+ int **sv;
+
+ sv = klp_shadow_alloc(obj, id, size, gfp_flags, ctor, var);
+ pr_info("klp_%s(obj=PTR%d, id=0x%lx, size=%zx, gfp_flags=%pGg), ctor=PTR%d, ctor_data=PTR%d = PTR%d\n",
+ __func__, ptr_id(obj), id, size, &gfp_flags, ptr_id(ctor),
+ ptr_id(*var), ptr_id(sv));
+
+ return sv;
+}
+
+static void *shadow_get_or_alloc(void *obj, unsigned long id, size_t size,
+ gfp_t gfp_flags, klp_shadow_ctor_t ctor,
+ void *ctor_data)
+{
+ int **var = ctor_data;
+ int **sv;
+
+ sv = klp_shadow_get_or_alloc(obj, id, size, gfp_flags, ctor, var);
+ pr_info("klp_%s(obj=PTR%d, id=0x%lx, size=%zx, gfp_flags=%pGg), ctor=PTR%d, ctor_data=PTR%d = PTR%d\n",
+ __func__, ptr_id(obj), id, size, &gfp_flags, ptr_id(ctor),
+ ptr_id(*var), ptr_id(sv));
+
+ return sv;
+}
+
+static void shadow_free(void *obj, unsigned long id, klp_shadow_dtor_t dtor)
+{
+ klp_shadow_free(obj, id, dtor);
+ pr_info("klp_%s(obj=PTR%d, id=0x%lx, dtor=PTR%d)\n",
+ __func__, ptr_id(obj), id, ptr_id(dtor));
+}
+
+static void shadow_free_all(unsigned long id, klp_shadow_dtor_t dtor)
+{
+ klp_shadow_free_all(id, dtor);
+ pr_info("klp_%s(id=0x%lx, dtor=PTR%d)\n", __func__, id, ptr_id(dtor));
+}
+
+
+/* Shadow variable constructor - remember simple pointer data */
+static int shadow_ctor(void *obj, void *shadow_data, void *ctor_data)
+{
+ int **sv = shadow_data;
+ int **var = ctor_data;
+
+ if (!var)
+ return -EINVAL;
+
+ *sv = *var;
+ pr_info("%s: PTR%d -> PTR%d\n", __func__, ptr_id(sv), ptr_id(*var));
+
+ return 0;
+}
+
+/*
+ * With more than one item to free in the list, order is not determined and
+ * shadow_dtor will not be passed to shadow_free_all() which would make the
+ * test fail. (see pass 6)
+ */
+static void shadow_dtor(void *obj, void *shadow_data)
+{
+ int **sv = shadow_data;
+
+ pr_info("%s(obj=PTR%d, shadow_data=PTR%d)\n",
+ __func__, ptr_id(obj), ptr_id(sv));
+}
+
+/* number of objects we simulate that need shadow vars */
+#define NUM_OBJS 3
+
+/* dynamically created obj fields have the following shadow var id values */
+#define SV_ID1 0x1234
+#define SV_ID2 0x1235
+
+/*
+ * The main test case adds/removes new fields (shadow var) to each of these
+ * test structure instances. The last group of fields in the struct represent
+ * the idea that shadow variables may be added and removed to and from the
+ * struct during execution.
+ */
+struct test_object {
+ /* add anything here below and avoid to define an empty struct */
+ struct shadow_ptr sp;
+
+ /* these represent shadow vars added and removed with SV_ID{1,2} */
+ /* char nfield1; */
+ /* int nfield2; */
+};
+
+static int test_klp_shadow_vars_init(void)
+{
+ struct test_object objs[NUM_OBJS];
+ char nfields1[NUM_OBJS], *pnfields1[NUM_OBJS], **sv1[NUM_OBJS];
+ char *pndup[NUM_OBJS];
+ int nfields2[NUM_OBJS], *pnfields2[NUM_OBJS], **sv2[NUM_OBJS];
+ void **sv;
+ int ret;
+ int i;
+
+ ptr_id(NULL);
+
+ /*
+ * With an empty shadow variable hash table, expect not to find
+ * any matches.
+ */
+ sv = shadow_get(&objs[0], SV_ID1);
+ if (!sv)
+ pr_info(" got expected NULL result\n");
+
+ /* pass 1: init & alloc a char+int pair of svars for each objs */
+ for (i = 0; i < NUM_OBJS; i++) {
+ pnfields1[i] = &nfields1[i];
+ ptr_id(pnfields1[i]);
+
+ if (i % 2) {
+ sv1[i] = shadow_alloc(&objs[i], SV_ID1,
+ sizeof(pnfields1[i]), GFP_KERNEL,
+ shadow_ctor, &pnfields1[i]);
+ } else {
+ sv1[i] = shadow_get_or_alloc(&objs[i], SV_ID1,
+ sizeof(pnfields1[i]), GFP_KERNEL,
+ shadow_ctor, &pnfields1[i]);
+ }
+ if (!sv1[i]) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ pnfields2[i] = &nfields2[i];
+ ptr_id(pnfields2[i]);
+ sv2[i] = shadow_alloc(&objs[i], SV_ID2, sizeof(pnfields2[i]),
+ GFP_KERNEL, shadow_ctor, &pnfields2[i]);
+ if (!sv2[i]) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ }
+
+ /* pass 2: verify we find allocated svars and where they point to */
+ for (i = 0; i < NUM_OBJS; i++) {
+ /* check the "char" svar for all objects */
+ sv = shadow_get(&objs[i], SV_ID1);
+ if (!sv) {
+ ret = -EINVAL;
+ goto out;
+ }
+ if ((char **)sv == sv1[i] && *sv1[i] == pnfields1[i])
+ pr_info(" got expected PTR%d -> PTR%d result\n",
+ ptr_id(sv1[i]), ptr_id(*sv1[i]));
+
+ /* check the "int" svar for all objects */
+ sv = shadow_get(&objs[i], SV_ID2);
+ if (!sv) {
+ ret = -EINVAL;
+ goto out;
+ }
+ if ((int **)sv == sv2[i] && *sv2[i] == pnfields2[i])
+ pr_info(" got expected PTR%d -> PTR%d result\n",
+ ptr_id(sv2[i]), ptr_id(*sv2[i]));
+ }
+
+ /* pass 3: verify that 'get_or_alloc' returns already allocated svars */
+ for (i = 0; i < NUM_OBJS; i++) {
+ pndup[i] = &nfields1[i];
+ ptr_id(pndup[i]);
+
+ sv = shadow_get_or_alloc(&objs[i], SV_ID1, sizeof(pndup[i]),
+ GFP_KERNEL, shadow_ctor, &pndup[i]);
+ if (!sv) {
+ ret = -EINVAL;
+ goto out;
+ }
+ if ((char **)sv == sv1[i] && *sv1[i] == pnfields1[i])
+ pr_info(" got expected PTR%d -> PTR%d result\n",
+ ptr_id(sv1[i]), ptr_id(*sv1[i]));
+ }
+
+ /* pass 4: free <objs[*], SV_ID1> pairs of svars, verify removal */
+ for (i = 0; i < NUM_OBJS; i++) {
+ shadow_free(&objs[i], SV_ID1, shadow_dtor); /* 'char' pairs */
+ sv = shadow_get(&objs[i], SV_ID1);
+ if (!sv)
+ pr_info(" got expected NULL result\n");
+ }
+
+ /* pass 5: check we still find <objs[*], SV_ID2> svar pairs */
+ for (i = 0; i < NUM_OBJS; i++) {
+ sv = shadow_get(&objs[i], SV_ID2); /* 'int' pairs */
+ if (!sv) {
+ ret = -EINVAL;
+ goto out;
+ }
+ if ((int **)sv == sv2[i] && *sv2[i] == pnfields2[i])
+ pr_info(" got expected PTR%d -> PTR%d result\n",
+ ptr_id(sv2[i]), ptr_id(*sv2[i]));
+ }
+
+ /* pass 6: free all the <objs[*], SV_ID2> svar pairs too. */
+ shadow_free_all(SV_ID2, NULL); /* 'int' pairs */
+ for (i = 0; i < NUM_OBJS; i++) {
+ sv = shadow_get(&objs[i], SV_ID2);
+ if (!sv)
+ pr_info(" got expected NULL result\n");
+ }
+
+ free_ptr_list();
+
+ return 0;
+out:
+ shadow_free_all(SV_ID1, NULL); /* 'char' pairs */
+ shadow_free_all(SV_ID2, NULL); /* 'int' pairs */
+ free_ptr_list();
+
+ return ret;
+}
+
+static void test_klp_shadow_vars_exit(void)
+{
+}
+
+module_init(test_klp_shadow_vars_init);
+module_exit(test_klp_shadow_vars_exit);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Joe Lawrence <joe.lawrence@redhat.com>");
+MODULE_DESCRIPTION("Livepatch test: shadow variables");
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2019 SUSE
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/printk.h>
+#include <linux/livepatch.h>
+
+#define CONSOLE_LOGLEVEL_STATE 1
+/* Version 1 does not support migration. */
+#define CONSOLE_LOGLEVEL_STATE_VERSION 1
+
+static const char *const module_state[] = {
+ [MODULE_STATE_LIVE] = "[MODULE_STATE_LIVE] Normal state",
+ [MODULE_STATE_COMING] = "[MODULE_STATE_COMING] Full formed, running module_init",
+ [MODULE_STATE_GOING] = "[MODULE_STATE_GOING] Going away",
+ [MODULE_STATE_UNFORMED] = "[MODULE_STATE_UNFORMED] Still setting it up",
+};
+
+static void callback_info(const char *callback, struct klp_object *obj)
+{
+ if (obj->mod)
+ pr_info("%s: %s -> %s\n", callback, obj->mod->name,
+ module_state[obj->mod->state]);
+ else
+ pr_info("%s: vmlinux\n", callback);
+}
+
+static struct klp_patch patch;
+
+static int allocate_loglevel_state(void)
+{
+ struct klp_state *loglevel_state;
+
+ loglevel_state = klp_get_state(&patch, CONSOLE_LOGLEVEL_STATE);
+ if (!loglevel_state)
+ return -EINVAL;
+
+ loglevel_state->data = kzalloc(sizeof(console_loglevel), GFP_KERNEL);
+ if (!loglevel_state->data)
+ return -ENOMEM;
+
+ pr_info("%s: allocating space to store console_loglevel\n",
+ __func__);
+ return 0;
+}
+
+static void fix_console_loglevel(void)
+{
+ struct klp_state *loglevel_state;
+
+ loglevel_state = klp_get_state(&patch, CONSOLE_LOGLEVEL_STATE);
+ if (!loglevel_state)
+ return;
+
+ pr_info("%s: fixing console_loglevel\n", __func__);
+ *(int *)loglevel_state->data = console_loglevel;
+ console_loglevel = CONSOLE_LOGLEVEL_MOTORMOUTH;
+}
+
+static void restore_console_loglevel(void)
+{
+ struct klp_state *loglevel_state;
+
+ loglevel_state = klp_get_state(&patch, CONSOLE_LOGLEVEL_STATE);
+ if (!loglevel_state)
+ return;
+
+ pr_info("%s: restoring console_loglevel\n", __func__);
+ console_loglevel = *(int *)loglevel_state->data;
+}
+
+static void free_loglevel_state(void)
+{
+ struct klp_state *loglevel_state;
+
+ loglevel_state = klp_get_state(&patch, CONSOLE_LOGLEVEL_STATE);
+ if (!loglevel_state)
+ return;
+
+ pr_info("%s: freeing space for the stored console_loglevel\n",
+ __func__);
+ kfree(loglevel_state->data);
+}
+
+/* Executed on object patching (ie, patch enablement) */
+static int pre_patch_callback(struct klp_object *obj)
+{
+ callback_info(__func__, obj);
+ return allocate_loglevel_state();
+}
+
+/* Executed on object unpatching (ie, patch disablement) */
+static void post_patch_callback(struct klp_object *obj)
+{
+ callback_info(__func__, obj);
+ fix_console_loglevel();
+}
+
+/* Executed on object unpatching (ie, patch disablement) */
+static void pre_unpatch_callback(struct klp_object *obj)
+{
+ callback_info(__func__, obj);
+ restore_console_loglevel();
+}
+
+/* Executed on object unpatching (ie, patch disablement) */
+static void post_unpatch_callback(struct klp_object *obj)
+{
+ callback_info(__func__, obj);
+ free_loglevel_state();
+}
+
+static struct klp_func no_funcs[] = {
+ {}
+};
+
+static struct klp_object objs[] = {
+ {
+ .name = NULL, /* vmlinux */
+ .funcs = no_funcs,
+ .callbacks = {
+ .pre_patch = pre_patch_callback,
+ .post_patch = post_patch_callback,
+ .pre_unpatch = pre_unpatch_callback,
+ .post_unpatch = post_unpatch_callback,
+ },
+ }, { }
+};
+
+static struct klp_state states[] = {
+ {
+ .id = CONSOLE_LOGLEVEL_STATE,
+ .version = CONSOLE_LOGLEVEL_STATE_VERSION,
+ }, { }
+};
+
+static struct klp_patch patch = {
+ .mod = THIS_MODULE,
+ .objs = objs,
+ .states = states,
+ .replace = true,
+};
+
+static int test_klp_callbacks_demo_init(void)
+{
+ return klp_enable_patch(&patch);
+}
+
+static void test_klp_callbacks_demo_exit(void)
+{
+}
+
+module_init(test_klp_callbacks_demo_init);
+module_exit(test_klp_callbacks_demo_exit);
+MODULE_LICENSE("GPL");
+MODULE_INFO(livepatch, "Y");
+MODULE_AUTHOR("Petr Mladek <pmladek@suse.com>");
+MODULE_DESCRIPTION("Livepatch test: system state modification");
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2019 SUSE
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/printk.h>
+#include <linux/livepatch.h>
+
+#define CONSOLE_LOGLEVEL_STATE 1
+/* Version 2 supports migration. */
+#define CONSOLE_LOGLEVEL_STATE_VERSION 2
+
+static const char *const module_state[] = {
+ [MODULE_STATE_LIVE] = "[MODULE_STATE_LIVE] Normal state",
+ [MODULE_STATE_COMING] = "[MODULE_STATE_COMING] Full formed, running module_init",
+ [MODULE_STATE_GOING] = "[MODULE_STATE_GOING] Going away",
+ [MODULE_STATE_UNFORMED] = "[MODULE_STATE_UNFORMED] Still setting it up",
+};
+
+static void callback_info(const char *callback, struct klp_object *obj)
+{
+ if (obj->mod)
+ pr_info("%s: %s -> %s\n", callback, obj->mod->name,
+ module_state[obj->mod->state]);
+ else
+ pr_info("%s: vmlinux\n", callback);
+}
+
+static struct klp_patch patch;
+
+static int allocate_loglevel_state(void)
+{
+ struct klp_state *loglevel_state, *prev_loglevel_state;
+
+ prev_loglevel_state = klp_get_prev_state(CONSOLE_LOGLEVEL_STATE);
+ if (prev_loglevel_state) {
+ pr_info("%s: space to store console_loglevel already allocated\n",
+ __func__);
+ return 0;
+ }
+
+ loglevel_state = klp_get_state(&patch, CONSOLE_LOGLEVEL_STATE);
+ if (!loglevel_state)
+ return -EINVAL;
+
+ loglevel_state->data = kzalloc(sizeof(console_loglevel), GFP_KERNEL);
+ if (!loglevel_state->data)
+ return -ENOMEM;
+
+ pr_info("%s: allocating space to store console_loglevel\n",
+ __func__);
+ return 0;
+}
+
+static void fix_console_loglevel(void)
+{
+ struct klp_state *loglevel_state, *prev_loglevel_state;
+
+ loglevel_state = klp_get_state(&patch, CONSOLE_LOGLEVEL_STATE);
+ if (!loglevel_state)
+ return;
+
+ prev_loglevel_state = klp_get_prev_state(CONSOLE_LOGLEVEL_STATE);
+ if (prev_loglevel_state) {
+ pr_info("%s: taking over the console_loglevel change\n",
+ __func__);
+ loglevel_state->data = prev_loglevel_state->data;
+ return;
+ }
+
+ pr_info("%s: fixing console_loglevel\n", __func__);
+ *(int *)loglevel_state->data = console_loglevel;
+ console_loglevel = CONSOLE_LOGLEVEL_MOTORMOUTH;
+}
+
+static void restore_console_loglevel(void)
+{
+ struct klp_state *loglevel_state, *prev_loglevel_state;
+
+ prev_loglevel_state = klp_get_prev_state(CONSOLE_LOGLEVEL_STATE);
+ if (prev_loglevel_state) {
+ pr_info("%s: passing the console_loglevel change back to the old livepatch\n",
+ __func__);
+ return;
+ }
+
+ loglevel_state = klp_get_state(&patch, CONSOLE_LOGLEVEL_STATE);
+ if (!loglevel_state)
+ return;
+
+ pr_info("%s: restoring console_loglevel\n", __func__);
+ console_loglevel = *(int *)loglevel_state->data;
+}
+
+static void free_loglevel_state(void)
+{
+ struct klp_state *loglevel_state, *prev_loglevel_state;
+
+ prev_loglevel_state = klp_get_prev_state(CONSOLE_LOGLEVEL_STATE);
+ if (prev_loglevel_state) {
+ pr_info("%s: keeping space to store console_loglevel\n",
+ __func__);
+ return;
+ }
+
+ loglevel_state = klp_get_state(&patch, CONSOLE_LOGLEVEL_STATE);
+ if (!loglevel_state)
+ return;
+
+ pr_info("%s: freeing space for the stored console_loglevel\n",
+ __func__);
+ kfree(loglevel_state->data);
+}
+
+/* Executed on object patching (ie, patch enablement) */
+static int pre_patch_callback(struct klp_object *obj)
+{
+ callback_info(__func__, obj);
+ return allocate_loglevel_state();
+}
+
+/* Executed on object unpatching (ie, patch disablement) */
+static void post_patch_callback(struct klp_object *obj)
+{
+ callback_info(__func__, obj);
+ fix_console_loglevel();
+}
+
+/* Executed on object unpatching (ie, patch disablement) */
+static void pre_unpatch_callback(struct klp_object *obj)
+{
+ callback_info(__func__, obj);
+ restore_console_loglevel();
+}
+
+/* Executed on object unpatching (ie, patch disablement) */
+static void post_unpatch_callback(struct klp_object *obj)
+{
+ callback_info(__func__, obj);
+ free_loglevel_state();
+}
+
+static struct klp_func no_funcs[] = {
+ {}
+};
+
+static struct klp_object objs[] = {
+ {
+ .name = NULL, /* vmlinux */
+ .funcs = no_funcs,
+ .callbacks = {
+ .pre_patch = pre_patch_callback,
+ .post_patch = post_patch_callback,
+ .pre_unpatch = pre_unpatch_callback,
+ .post_unpatch = post_unpatch_callback,
+ },
+ }, { }
+};
+
+static struct klp_state states[] = {
+ {
+ .id = CONSOLE_LOGLEVEL_STATE,
+ .version = CONSOLE_LOGLEVEL_STATE_VERSION,
+ }, { }
+};
+
+static struct klp_patch patch = {
+ .mod = THIS_MODULE,
+ .objs = objs,
+ .states = states,
+ .replace = true,
+};
+
+static int test_klp_callbacks_demo_init(void)
+{
+ return klp_enable_patch(&patch);
+}
+
+static void test_klp_callbacks_demo_exit(void)
+{
+}
+
+module_init(test_klp_callbacks_demo_init);
+module_exit(test_klp_callbacks_demo_exit);
+MODULE_LICENSE("GPL");
+MODULE_INFO(livepatch, "Y");
+MODULE_AUTHOR("Petr Mladek <pmladek@suse.com>");
+MODULE_DESCRIPTION("Livepatch test: system state modification");
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2019 SUSE
+
+/* The console loglevel fix is the same in the next cumulative patch. */
+#include "test_klp_state2.c"
projects / linux / .git / commitdiff