mirror of
https://github.com/ocornut/imgui.git
synced 2026-11-06 14:35:51 +01:00
259 lines
7.9 KiB
C++
259 lines
7.9 KiB
C++
/**
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* injector.cpp – 让 dlopen 正常返回（不再依赖 segfault）
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/ptrace.h>
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#include <sys/uio.h>
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#include <sys/wait.h>
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#include <sys/user.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <dirent.h>
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#include <dlfcn.h>
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#include <errno.h>
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#include <linux/elf.h>
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#include <asm/ptrace.h>
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#include <ctype.h>
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#define DEFAULT_SO_PATH "/data/1/libMyMenu.so"
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#define DEFAULT_PKG_NAME "com.tencent.jkchess"
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// ---------- 查找进程 ----------
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int find_pid_by_name(const char* proc_name) {
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DIR* dir = opendir("/proc");
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if (!dir) return -1;
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struct dirent* entry;
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int pid = -1;
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while ((entry = readdir(dir)) != nullptr) {
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if (entry->d_type != DT_DIR) continue;
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int tmp_pid = atoi(entry->d_name);
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if (tmp_pid <= 0) continue;
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char cmdline_path[256];
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snprintf(cmdline_path, sizeof(cmdline_path), "/proc/%d/cmdline", tmp_pid);
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FILE* fp = fopen(cmdline_path, "r");
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if (fp) {
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char cmdline[256] = {0};
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size_t n = fread(cmdline, 1, sizeof(cmdline) - 1, fp);
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fclose(fp);
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if (n > 0) {
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char* pkg = cmdline;
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char* last_slash = strrchr(pkg, '/');
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if (last_slash) pkg = last_slash + 1;
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if (strcmp(pkg, proc_name) == 0) {
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pid = tmp_pid;
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break;
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}
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}
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}
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}
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closedir(dir);
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return pid;
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}
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// ---------- ptrace 读写 ----------
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long ptrace_writedata(int pid, unsigned long addr, const void* buffer, size_t size) {
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for (size_t i = 0; i < size; i += sizeof(long)) {
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long data = 0;
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memcpy(&data, (char*)buffer + i, (size - i) < sizeof(long) ? (size - i) : sizeof(long));
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if (ptrace(PTRACE_POKEDATA, pid, addr + i, data) == -1) {
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perror("ptrace_pokedata");
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return -1;
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}
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}
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return 0;
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}
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// ---------- 扫描远程进程的可写内存 ----------
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unsigned long find_writable_region(int pid, size_t needed_size) {
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char maps_path[64];
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snprintf(maps_path, sizeof(maps_path), "/proc/%d/maps", pid);
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FILE* fp = fopen(maps_path, "r");
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if (!fp) {
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perror("open remote maps");
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return 0;
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}
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char line[512];
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unsigned long best_addr = 0;
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while (fgets(line, sizeof(line), fp)) {
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unsigned long start, end;
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char perms[8];
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if (sscanf(line, "%lx-%lx %s", &start, &end, perms) != 3) continue;
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if (strchr(perms, 'w') && start >= 0x1000000 && (end - start) >= needed_size) {
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if (strstr(line, "libc_malloc") || strstr(line, "[heap]") || strstr(line, "[anon]")) {
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best_addr = start;
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break;
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}
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if (best_addr == 0) best_addr = start;
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}
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}
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fclose(fp);
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return best_addr;
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}
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// ---------- 注入主函数 ----------
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int inject_so(int pid, const char* so_path) {
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if (ptrace(PTRACE_ATTACH, pid, 0, 0) == -1) {
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perror("ptrace attach");
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return -1;
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}
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int status;
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waitpid(pid, &status, 0);
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if (!WIFSTOPPED(status)) {
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fprintf(stderr, "process not stopped\n");
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ptrace(PTRACE_DETACH, pid, 0, 0);
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return -1;
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}
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struct user_pt_regs orig_regs, regs;
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struct iovec iov = { &orig_regs, sizeof(orig_regs) };
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if (ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &iov) == -1) {
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perror("getregset original");
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ptrace(PTRACE_DETACH, pid, 0, 0);
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return -1;
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}
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regs = orig_regs;
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size_t path_len = strlen(so_path) + 1;
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unsigned long remote_addr = find_writable_region(pid, path_len);
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if (remote_addr == 0) {
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fprintf(stderr, "No suitable writable region\n");
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ptrace(PTRACE_DETACH, pid, 0, 0);
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return -1;
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}
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printf("[+] Using writable region at 0x%lx\n", remote_addr);
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if (ptrace_writedata(pid, remote_addr, so_path, path_len) == -1) {
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fprintf(stderr, "ptrace_writedata failed\n");
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ptrace(PTRACE_DETACH, pid, 0, 0);
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return -1;
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}
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printf("[+] Wrote SO path\n");
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// 计算远程 dlopen
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void* local_dlopen = (void*)dlopen;
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unsigned long local_libdl_base = 0;
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FILE* fp = fopen("/proc/self/maps", "r");
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if (!fp) {
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perror("open self maps");
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ptrace(PTRACE_DETACH, pid, 0, 0);
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return -1;
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}
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char line[512];
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while (fgets(line, sizeof(line), fp)) {
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if (strstr(line, "libdl.so")) {
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sscanf(line, "%lx", &local_libdl_base);
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break;
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}
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}
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fclose(fp);
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if (local_libdl_base == 0) {
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fprintf(stderr, "can't find local libdl.so base\n");
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ptrace(PTRACE_DETACH, pid, 0, 0);
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return -1;
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}
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unsigned long dlopen_offset = (unsigned long)local_dlopen - local_libdl_base;
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char remote_maps_path[64];
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snprintf(remote_maps_path, sizeof(remote_maps_path), "/proc/%d/maps", pid);
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fp = fopen(remote_maps_path, "r");
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if (!fp) {
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perror("open remote maps");
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ptrace(PTRACE_DETACH, pid, 0, 0);
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return -1;
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}
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unsigned long remote_libdl_base = 0;
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while (fgets(line, sizeof(line), fp)) {
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if (strstr(line, "libdl.so")) {
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sscanf(line, "%lx", &remote_libdl_base);
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break;
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}
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}
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fclose(fp);
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if (remote_libdl_base == 0) {
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fprintf(stderr, "can't find remote libdl.so base\n");
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ptrace(PTRACE_DETACH, pid, 0, 0);
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return -1;
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}
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unsigned long remote_dlopen = remote_libdl_base + dlopen_offset;
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printf("[+] Remote dlopen: 0x%lx\n", remote_dlopen);
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// 设置 PC 为 dlopen，LR 为原 PC+4（让 dlopen 返回后继续执行）
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regs = orig_regs;
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regs.regs[0] = remote_addr;
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regs.regs[1] = RTLD_LAZY;
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regs.pc = remote_dlopen;
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regs.regs[30] = orig_regs.pc + 4; // 返回地址设为原 PC 后一条指令
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iov.iov_base = ®s; iov.iov_len = sizeof(regs);
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if (ptrace(PTRACE_SETREGSET, pid, NT_PRSTATUS, &iov) == -1) {
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perror("setregset for dlopen");
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ptrace(PTRACE_DETACH, pid, 0, 0);
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return -1;
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}
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// 继续执行，不再等待 segfault
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if (ptrace(PTRACE_CONT, pid, 0, 0) == -1) {
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perror("ptrace cont");
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ptrace(PTRACE_DETACH, pid, 0, 0);
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return -1;
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}
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// 等待进程暂停（可能由于信号）或退出
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waitpid(pid, &status, 0);
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// 如果进程意外停止，尝试恢复
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if (WIFSTOPPED(status)) {
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printf("[!] Process stopped with signal %d, continuing...\n", WSTOPSIG(status));
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ptrace(PTRACE_CONT, pid, 0, 0);
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waitpid(pid, &status, 0);
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}
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// 恢复原始寄存器并 detach
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iov.iov_base = &orig_regs; iov.iov_len = sizeof(orig_regs);
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ptrace(PTRACE_SETREGSET, pid, NT_PRSTATUS, &iov);
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ptrace(PTRACE_DETACH, pid, 0, 0);
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printf("[+] Injection completed (dlopen returned).\n");
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return 0;
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}
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// ---------- 主函数 ----------
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int main(int argc, char** argv) {
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const char* so_path = DEFAULT_SO_PATH;
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const char* target = DEFAULT_PKG_NAME;
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int pid = -1;
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if (argc >= 2) so_path = argv[1];
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if (argc >= 3) {
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bool is_digit = true;
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for (int i = 0; argv[2][i]; i++) {
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if (!isdigit(argv[2][i])) { is_digit = false; break; }
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}
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if (is_digit) pid = atoi(argv[2]);
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else target = argv[2];
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}
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printf("[Injector] SO: %s\n", so_path);
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printf("[Injector] Target: %s\n", target);
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if (access(so_path, F_OK) != 0) {
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fprintf(stderr, "SO file not found: %s\n", so_path);
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return 1;
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}
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if (pid <= 0) {
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printf("[Injector] Searching for process '%s'...\n", target);
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pid = find_pid_by_name(target);
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if (pid <= 0) {
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fprintf(stderr, "Process '%s' not found\n", target);
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return 1;
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}
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printf("[Injector] Found PID: %d\n", pid);
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} else {
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printf("[Injector] Using specified PID: %d\n", pid);
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}
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return inject_so(pid, so_path);
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}
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