283 lines
8.2 KiB
C
283 lines
8.2 KiB
C
/* 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/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/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/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/set_memory.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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#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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#include "../kernel_compat.h"
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#define KPM_NAME_LEN 32
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#define KPM_ARGS_LEN 1024
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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, int *result)
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{
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pr_info("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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}
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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, int *result)
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{
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pr_info("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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}
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EXPORT_SYMBOL(sukisu_kpm_unload_module);
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noinline NO_OPTIMIZE void sukisu_kpm_num(int *result)
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{
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pr_info("kpm: Stub function called (sukisu_kpm_num).\n");
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__asm__ volatile("nop");
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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, char *buf, int bufferSize,
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int *size)
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{
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pr_info("kpm: Stub function called (sukisu_kpm_info). "
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"name=%s buffer=%p\n", name, buf);
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__asm__ volatile("nop");
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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 *out, int bufferSize,
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int *result)
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{
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pr_info("kpm: Stub function called (sukisu_kpm_list). "
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"buffer=%p size=%d\n", out, bufferSize);
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}
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EXPORT_SYMBOL(sukisu_kpm_list);
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noinline NO_OPTIMIZE void sukisu_kpm_control(const char *name, const char *args, long arg_len,
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int *result)
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{
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pr_info("kpm: Stub function called (sukisu_kpm_control). "
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"name=%p args=%p arg_len=%ld\n", name, args, arg_len);
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__asm__ volatile("nop");
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}
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EXPORT_SYMBOL(sukisu_kpm_control);
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noinline NO_OPTIMIZE void sukisu_kpm_version(char *buf, int bufferSize)
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{
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pr_info("kpm: Stub function called (sukisu_kpm_version). "
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"buffer=%p\n", buf);
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}
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EXPORT_SYMBOL(sukisu_kpm_version);
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noinline int sukisu_handle_kpm(unsigned long control_code, unsigned long arg1, unsigned long arg2,
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unsigned long result_code)
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{
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int res = -1;
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if (control_code == SUKISU_KPM_LOAD) {
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char kernel_load_path[256];
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char kernel_args_buffer[256];
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if (arg1 == 0) {
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res = -EINVAL;
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goto exit;
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}
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if (!ksu_access_ok(arg1, sizeof(kernel_load_path))) {
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goto invalid_arg;
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}
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strncpy_from_user((char *)&kernel_load_path, (const char *)arg1, sizeof(kernel_load_path));
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if (arg2 != 0) {
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if (!ksu_access_ok(arg2, sizeof(kernel_args_buffer))) {
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goto invalid_arg;
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}
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strncpy_from_user((char *)&kernel_args_buffer, (const char *)arg2, sizeof(kernel_args_buffer));
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}
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sukisu_kpm_load_module_path((const char *)&kernel_load_path,
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(const char *)&kernel_args_buffer, NULL, &res);
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} else if (control_code == SUKISU_KPM_UNLOAD) {
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char kernel_name_buffer[256];
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if (arg1 == 0) {
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res = -EINVAL;
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goto exit;
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}
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if (!ksu_access_ok(arg1, sizeof(kernel_name_buffer))) {
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goto invalid_arg;
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}
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strncpy_from_user((char *)&kernel_name_buffer, (const char *)arg1, sizeof(kernel_name_buffer));
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sukisu_kpm_unload_module((const char *)&kernel_name_buffer, NULL, &res);
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} else if (control_code == SUKISU_KPM_NUM) {
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sukisu_kpm_num(&res);
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} else if (control_code == SUKISU_KPM_INFO) {
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char kernel_name_buffer[256];
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char buf[256];
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int size;
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if (arg1 == 0 || arg2 == 0) {
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res = -EINVAL;
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goto exit;
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}
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if (!ksu_access_ok(arg1, sizeof(kernel_name_buffer))) {
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goto invalid_arg;
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}
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strncpy_from_user((char *)&kernel_name_buffer, (const char __user *)arg1, sizeof(kernel_name_buffer));
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sukisu_kpm_info((const char *)&kernel_name_buffer, (char *)&buf, sizeof(buf), &size);
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if (!ksu_access_ok(arg2, size)) {
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goto invalid_arg;
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}
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res = copy_to_user(arg2, &buf, size);
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} else if (control_code == SUKISU_KPM_LIST) {
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char buf[1024];
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int len = (int) arg2;
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if (len <= 0) {
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res = -EINVAL;
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goto exit;
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}
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if (!ksu_access_ok(arg2, len)) {
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goto invalid_arg;
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}
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sukisu_kpm_list((char *)&buf, sizeof(buf), &res);
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if (res > len) {
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res = -ENOBUFS;
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goto exit;
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}
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if (copy_to_user(arg1, &buf, len) != 0)
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pr_info("kpm: Copy to user failed.");
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} else if (control_code == SUKISU_KPM_CONTROL) {
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char kpm_name[KPM_NAME_LEN] = { 0 };
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char kpm_args[KPM_ARGS_LEN] = { 0 };
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if (!ksu_access_ok(arg1, sizeof(kpm_name))) {
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goto invalid_arg;
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}
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if (!ksu_access_ok(arg2, sizeof(kpm_args))) {
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goto invalid_arg;
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}
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long name_len = strncpy_from_user((char *)&kpm_name, (const char __user *)arg1, sizeof(kpm_name));
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if (name_len <= 0) {
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res = -EINVAL;
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goto exit;
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}
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long arg_len = strncpy_from_user((char *)&kpm_args, (const char __user *)arg2, sizeof(kpm_args));
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sukisu_kpm_control((const char *)&kpm_name, (const char *)&kpm_args, arg_len, &res);
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} else if (control_code == SUKISU_KPM_VERSION) {
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char buffer[256] = {0};
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sukisu_kpm_version((char*) &buffer, sizeof(buffer));
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unsigned int outlen = (unsigned int) arg2;
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int len = strlen(buffer);
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if (len >= outlen) len = outlen - 1;
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res = copy_to_user(arg1, &buffer, len + 1);
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}
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exit:
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if (copy_to_user(result_code, &res, sizeof(res)) != 0)
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pr_info("kpm: Copy to user failed.");
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return 0;
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invalid_arg:
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pr_err("kpm: invalid pointer detected! arg1: %px arg2: %px\n", (void *)arg1, (void *)arg2);
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res = -EFAULT;
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goto exit;
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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 control_code) {
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return (control_code >= CMD_KPM_CONTROL &&
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control_code <= CMD_KPM_CONTROL_MAX) ? 1 : 0;
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}
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int do_kpm(void __user *arg)
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{
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struct ksu_kpm_cmd cmd;
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if (copy_from_user(&cmd, arg, sizeof(cmd))) {
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pr_err("kpm: copy_from_user failed\n");
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return -EFAULT;
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}
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if (!ksu_access_ok(cmd.control_code, sizeof(int))) {
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pr_err("kpm: invalid control_code pointer %px\n", (void *)cmd.control_code);
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return -EFAULT;
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}
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if (!ksu_access_ok(cmd.result_code, sizeof(int))) {
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pr_err("kpm: invalid result_code pointer %px\n", (void *)cmd.result_code);
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return -EFAULT;
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}
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return sukisu_handle_kpm(cmd.control_code, cmd.arg1, cmd.arg2, cmd.result_code);
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}
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