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211
kernel/kpm/kpm.c
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211
kernel/kpm/kpm.c
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/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright (C) 2025 Liankong (xhsw.new@outlook.com). All Rights Reserved.
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* 本代码由GPL-2授权
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*
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* 适配KernelSU的KPM 内核模块加载器兼容实现
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*
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* 集成了 ELF 解析、内存布局、符号处理、重定位（支持 ARM64 重定位类型）
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* 并参照KernelPatch的标准KPM格式实现加载和控制
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*/
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#include <linux/export.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/fs.h>
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#include <linux/kernfs.h>
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#include <linux/file.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/uaccess.h>
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#include <linux/elf.h>
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#include <linux/kallsyms.h>
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#include <linux/version.h>
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#include <linux/list.h>
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#include <linux/spinlock.h>
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#include <linux/rcupdate.h>
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#include <asm/elf.h>
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#include <linux/vmalloc.h>
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#include <linux/mm.h>
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#include <linux/string.h>
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#include <asm/cacheflush.h>
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#include <linux/module.h>
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#include <linux/vmalloc.h>
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#include <linux/set_memory.h>
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#include <linux/version.h>
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#include <linux/export.h>
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#include <linux/slab.h>
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#include <asm/insn.h>
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#include <linux/kprobes.h>
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#include <linux/stacktrace.h>
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#include <linux/kallsyms.h>
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(5,0,0) && defined(CONFIG_MODULES)
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#include <linux/moduleloader.h>
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#endif
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#include "kpm.h"
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#include "compact.h"
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#ifndef NO_OPTIMIZE
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#if defined(__GNUC__) && !defined(__clang__)
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#define NO_OPTIMIZE __attribute__((optimize("O0")))
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#elif defined(__clang__)
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#define NO_OPTIMIZE __attribute__((optnone))
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#else
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#define NO_OPTIMIZE
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#endif
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#endif
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noinline NO_OPTIMIZE void sukisu_kpm_load_module_path(const char *path,
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const char *args, void *ptr, void __user *result)
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{
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int res = -1;
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printk("KPM: Stub function called (sukisu_kpm_load_module_path). "
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"path=%s args=%s ptr=%p\n", path, args, ptr);
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__asm__ volatile("nop");
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if (copy_to_user(result, &res, sizeof(res)) < 1)
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printk("KPM: Copy to user failed.");
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}
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EXPORT_SYMBOL(sukisu_kpm_load_module_path);
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noinline NO_OPTIMIZE void sukisu_kpm_unload_module(const char *name,
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void *ptr, void __user *result)
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{
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int res = -1;
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printk("KPM: Stub function called (sukisu_kpm_unload_module). "
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"name=%s ptr=%p\n", name, ptr);
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__asm__ volatile("nop");
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if (copy_to_user(result, &res, sizeof(res)) < 1)
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printk("KPM: Copy to user failed.");
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}
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EXPORT_SYMBOL(sukisu_kpm_unload_module);
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noinline NO_OPTIMIZE void sukisu_kpm_num(void __user *result)
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{
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int res = 0;
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printk("KPM: Stub function called (sukisu_kpm_num).\n");
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__asm__ volatile("nop");
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if (copy_to_user(result, &res, sizeof(res)) < 1)
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printk("KPM: Copy to user failed.");
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}
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EXPORT_SYMBOL(sukisu_kpm_num);
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noinline NO_OPTIMIZE void sukisu_kpm_info(const char *name, void __user *out,
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void __user *result)
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{
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int res = -1;
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printk("KPM: Stub function called (sukisu_kpm_info). "
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"name=%s buffer=%p\n", name, out);
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__asm__ volatile("nop");
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if (copy_to_user(result, &res, sizeof(res)) < 1)
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printk("KPM: Copy to user failed.");
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}
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EXPORT_SYMBOL(sukisu_kpm_info);
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noinline NO_OPTIMIZE void sukisu_kpm_list(void __user *out, unsigned int bufferSize,
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void __user *result)
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{
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int res = -1;
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printk("KPM: Stub function called (sukisu_kpm_list). "
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"buffer=%p size=%d\n", out, bufferSize);
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if (copy_to_user(result, &res, sizeof(res)) < 1)
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printk("KPM: Copy to user failed.");
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}
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EXPORT_SYMBOL(sukisu_kpm_list);
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noinline NO_OPTIMIZE void sukisu_kpm_control(void __user *name, void __user *args,
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void __user *result)
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{
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int res = -1;
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printk("KPM: Stub function called (sukisu_kpm_control). "
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"name=%p args=%p\n", name, args);
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__asm__ volatile("nop");
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if (copy_to_user(result, &res, sizeof(res)) < 1)
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printk("KPM: Copy to user failed.");
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}
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EXPORT_SYMBOL(sukisu_kpm_control);
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noinline NO_OPTIMIZE void sukisu_kpm_version(void __user *out, unsigned int bufferSize,
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void __user *result)
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{
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int res = -1;
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printk("KPM: Stub function called (sukisu_kpm_version). "
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"buffer=%p size=%d\n", out, bufferSize);
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if (copy_to_user(result, &res, sizeof(res)) < 1)
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printk("KPM: Copy to user failed.");
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}
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EXPORT_SYMBOL(sukisu_kpm_version);
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noinline int sukisu_handle_kpm(unsigned long arg2, unsigned long arg3, unsigned long arg4,
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unsigned long arg5)
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{
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if (arg2 == SUKISU_KPM_LOAD) {
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char kernel_load_path[256] = { 0 };
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char kernel_args_buffer[256] = { 0 };
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if (arg3 == 0)
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return -1;
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strncpy_from_user((char *)&kernel_load_path, (const char __user *)arg3, 255);
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if (arg4 != 0)
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strncpy_from_user((char *)&kernel_args_buffer, (const char __user *)arg4, 255);
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sukisu_kpm_load_module_path((const char *)&kernel_load_path,
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(const char *)&kernel_args_buffer, NULL, (void __user *)arg5);
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} else if (arg2 == SUKISU_KPM_UNLOAD) {
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char kernel_name_buffer[256] = { 0 };
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if (arg3 == 0)
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return -1;
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strncpy_from_user((char *)&kernel_name_buffer, (const char __user *)arg3, 255);
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sukisu_kpm_unload_module((const char *)&kernel_name_buffer, NULL,
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(void __user *)arg5);
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} else if (arg2 == SUKISU_KPM_NUM) {
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sukisu_kpm_num((void __user *)arg5);
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} else if (arg2 == SUKISU_KPM_INFO) {
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char kernel_name_buffer[256] = { 0 };
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if (arg3 == 0 || arg4 == 0)
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return -1;
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strncpy_from_user((char *)&kernel_name_buffer, (const char __user *)arg3, 255);
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sukisu_kpm_info((const char *)&kernel_name_buffer, (char __user *)arg4,
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(void __user *)arg5);
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} else if (arg2 == SUKISU_KPM_LIST) {
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sukisu_kpm_list((char __user *)arg3, (unsigned int)arg4, (void __user *)arg5);
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} else if (arg2 == SUKISU_KPM_CONTROL) {
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sukisu_kpm_control((char __user *)arg3, (char __user *)arg4, (void __user *)arg5);
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} else if (arg2 == SUKISU_KPM_VERSION) {
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sukisu_kpm_version((char __user *)arg3, (unsigned int)arg4, (void __user *)arg5);
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}
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return 0;
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}
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EXPORT_SYMBOL(sukisu_handle_kpm);
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int sukisu_is_kpm_control_code(unsigned long arg2) {
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return (arg2 >= CMD_KPM_CONTROL &&
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arg2 <= CMD_KPM_CONTROL_MAX) ? 1 : 0;
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}
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