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121 lines
2.9 KiB
121 lines
2.9 KiB
// SPDX-License-Identifier: GPL-2.0 |
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// Copyright (C) 2018 Joe Lawrence <[email protected]> |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/module.h> |
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#include <linux/kernel.h> |
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#include <linux/livepatch.h> |
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static int pre_patch_ret; |
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module_param(pre_patch_ret, int, 0644); |
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MODULE_PARM_DESC(pre_patch_ret, "pre_patch_ret (default=0)"); |
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static const char *const module_state[] = { |
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[MODULE_STATE_LIVE] = "[MODULE_STATE_LIVE] Normal state", |
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[MODULE_STATE_COMING] = "[MODULE_STATE_COMING] Full formed, running module_init", |
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[MODULE_STATE_GOING] = "[MODULE_STATE_GOING] Going away", |
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[MODULE_STATE_UNFORMED] = "[MODULE_STATE_UNFORMED] Still setting it up", |
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}; |
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static void callback_info(const char *callback, struct klp_object *obj) |
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{ |
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if (obj->mod) |
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pr_info("%s: %s -> %s\n", callback, obj->mod->name, |
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module_state[obj->mod->state]); |
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else |
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pr_info("%s: vmlinux\n", callback); |
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} |
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/* Executed on object patching (ie, patch enablement) */ |
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static int pre_patch_callback(struct klp_object *obj) |
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{ |
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callback_info(__func__, obj); |
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return pre_patch_ret; |
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} |
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/* Executed on object unpatching (ie, patch disablement) */ |
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static void post_patch_callback(struct klp_object *obj) |
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{ |
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callback_info(__func__, obj); |
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} |
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/* Executed on object unpatching (ie, patch disablement) */ |
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static void pre_unpatch_callback(struct klp_object *obj) |
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{ |
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callback_info(__func__, obj); |
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} |
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/* Executed on object unpatching (ie, patch disablement) */ |
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static void post_unpatch_callback(struct klp_object *obj) |
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{ |
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callback_info(__func__, obj); |
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} |
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static void patched_work_func(struct work_struct *work) |
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{ |
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pr_info("%s\n", __func__); |
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} |
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static struct klp_func no_funcs[] = { |
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{} |
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}; |
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static struct klp_func busymod_funcs[] = { |
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{ |
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.old_name = "busymod_work_func", |
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.new_func = patched_work_func, |
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}, {} |
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}; |
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static struct klp_object objs[] = { |
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{ |
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.name = NULL, /* vmlinux */ |
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.funcs = no_funcs, |
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.callbacks = { |
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.pre_patch = pre_patch_callback, |
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.post_patch = post_patch_callback, |
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.pre_unpatch = pre_unpatch_callback, |
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.post_unpatch = post_unpatch_callback, |
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}, |
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}, { |
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.name = "test_klp_callbacks_mod", |
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.funcs = no_funcs, |
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.callbacks = { |
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.pre_patch = pre_patch_callback, |
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.post_patch = post_patch_callback, |
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.pre_unpatch = pre_unpatch_callback, |
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.post_unpatch = post_unpatch_callback, |
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}, |
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}, { |
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.name = "test_klp_callbacks_busy", |
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.funcs = busymod_funcs, |
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.callbacks = { |
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.pre_patch = pre_patch_callback, |
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.post_patch = post_patch_callback, |
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.pre_unpatch = pre_unpatch_callback, |
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.post_unpatch = post_unpatch_callback, |
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}, |
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}, { } |
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}; |
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static struct klp_patch patch = { |
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.mod = THIS_MODULE, |
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.objs = objs, |
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}; |
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static int test_klp_callbacks_demo_init(void) |
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{ |
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return klp_enable_patch(&patch); |
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} |
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static void test_klp_callbacks_demo_exit(void) |
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{ |
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} |
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module_init(test_klp_callbacks_demo_init); |
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module_exit(test_klp_callbacks_demo_exit); |
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MODULE_LICENSE("GPL"); |
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MODULE_INFO(livepatch, "Y"); |
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MODULE_AUTHOR("Joe Lawrence <[email protected]>"); |
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MODULE_DESCRIPTION("Livepatch test: livepatch demo");
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