391 lines
13 KiB
C++
391 lines
13 KiB
C++
/*
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* TNG eWallet — Zygisk companion.
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*
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* stable: PLT + ABRT/SIGTRAP swallow + exit_group seccomp@400ms.
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* Promon worker SIGSEGV (libtngdigital_ewallet.so null deref): LR-return skip (cap N).
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* pc==lr 循环 SEGV 也 skip；libc++abi __cxa_guard_acquire → SIGABRT 吞掉。
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*/
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#include <android/log.h>
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#include <errno.h>
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#include <linux/audit.h>
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#include <linux/filter.h>
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#include <linux/seccomp.h>
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#include <pthread.h>
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#include <signal.h>
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#include <stddef.h>
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#include <sys/mman.h>
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#include <sys/prctl.h>
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#include <sys/syscall.h>
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#include <sys/sysmacros.h>
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#include <ucontext.h>
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#include <unistd.h>
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#include <atomic>
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#include <cstdint>
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#include <cstdio>
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#include <cstring>
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#include "zygisk.hpp"
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#define SC_RET_ALLOW 0x7fff0000U
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#define SC_RET_ERRNO_EPERM (0x00050000U | 1U)
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#define LOG_TAG "TngExitGuard"
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#define LOGI(...) __android_log_print(ANDROID_LOG_INFO, LOG_TAG, __VA_ARGS__)
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#define LOGE(...) __android_log_print(ANDROID_LOG_ERROR, LOG_TAG, __VA_ARGS__)
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static constexpr const char *kTargetPkg = "my.com.tngdigital.ewallet";
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static constexpr const char *kPromonSo = "libtngdigital_ewallet.so";
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static bool g_enabled = false;
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static std::atomic<int> g_seccomp_ok{0};
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static std::atomic<int> g_stack_chk{0};
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static std::atomic<int> g_promon_segv{0};
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static std::atomic<uintptr_t> g_promon_start{0};
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static std::atomic<uintptr_t> g_promon_end{0};
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/* 隔离进程 :goacqowmmt 会循环 SEGV；cap=16 打满后 freeze 反拖累主进程 */
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static constexpr int kMaxPromonSegvSkip = 0; /* 0 = unlimited LR-return skip */
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static std::atomic<int> g_soft_sig_logged{0};
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static void freeze_forever() {
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for (;;) pause();
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}
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static void refresh_promon_so_range() {
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FILE *fp = fopen("/proc/self/maps", "r");
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if (!fp) return;
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char line[1024];
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uintptr_t start = 0, end = 0;
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while (fgets(line, sizeof(line), fp)) {
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unsigned long s = 0, e = 0;
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char path[512] = {};
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int n = sscanf(line, "%lx-%lx %*s %*s %*s %*s %511[^\n]", &s, &e, path);
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if (n < 3) continue;
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char *p = path;
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while (*p == ' ') ++p;
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if (strstr(p, kPromonSo) == nullptr) continue;
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if (start == 0 || s < start) start = s;
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if (e > end) end = e;
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}
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fclose(fp);
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if (start != 0 && end > start) {
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g_promon_start.store(start);
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g_promon_end.store(end);
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}
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}
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static bool pc_in_promon_so(uintptr_t pc) {
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uintptr_t start = g_promon_start.load();
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uintptr_t end = g_promon_end.load();
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return start != 0 && pc >= start && pc < end;
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}
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static void promon_segv_handler(int sig, siginfo_t *info, void *ctx) {
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(void)sig;
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(void)info;
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ucontext_t *uc = reinterpret_cast<ucontext_t *>(ctx);
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#if defined(__aarch64__)
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uintptr_t pc = uc->uc_mcontext.pc;
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uintptr_t lr = uc->uc_mcontext.regs[30];
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#else
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uintptr_t pc = 0;
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uintptr_t lr = 0;
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#endif
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refresh_promon_so_range();
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/* Promon 典型 pc==lr 自旋 null deref；maps 尚未刷新时也按此 skip */
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if (pc != 0 && pc == lr) {
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int n = ++g_promon_segv;
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if (n <= 3 || n % 50 == 0) {
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LOGI("promon pc==lr SIGSEGV tid=%d pc=%lx n=%d — skip to pc+4",
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(int)gettid(), (unsigned long)pc, n);
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}
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uc->uc_mcontext.pc = pc + 4;
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return;
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}
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if (pc_in_promon_so(pc) || pc_in_promon_so(lr)) {
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int n = ++g_promon_segv;
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uintptr_t target = lr;
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if (target == 0 || target == pc) {
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target = pc + 4;
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}
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if (kMaxPromonSegvSkip <= 0 || n <= kMaxPromonSegvSkip) {
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if (n <= 3 || n % 50 == 0) {
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LOGI("promon SIGSEGV tid=%d pc=%lx lr=%lx n=%d — skip to %lx",
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(int)gettid(), (unsigned long)pc, (unsigned long)lr, n,
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(unsigned long)target);
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}
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uc->uc_mcontext.pc = target;
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return;
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}
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LOGI("promon SIGSEGV tid=%d n=%d — cap hit, freeze", (int)gettid(), n);
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freeze_forever();
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}
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signal(SIGSEGV, SIG_DFL);
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raise(SIGSEGV);
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}
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/** libc++abi __cxa_guard_acquire 递归初始化 → abort；跳回 LR 继续而非杀进程。 */
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static void fatal_skip_handler(int sig, siginfo_t *info, void *ctx) {
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(void)info;
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ucontext_t *uc = reinterpret_cast<ucontext_t *>(ctx);
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#if defined(__aarch64__)
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uintptr_t pc = uc->uc_mcontext.pc;
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uintptr_t lr = uc->uc_mcontext.regs[30];
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LOGI("swallowed signal %d tid=%d pc=%lx lr=%lx", sig, (int)gettid(),
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(unsigned long)pc, (unsigned long)lr);
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if (lr != 0) {
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uc->uc_mcontext.pc = lr;
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return;
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}
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if (pc != 0) {
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uc->uc_mcontext.pc = pc + 4;
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return;
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}
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#endif
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freeze_forever();
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}
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static void install_fatal_skip_handlers() {
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struct sigaction sa {};
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sa.sa_sigaction = fatal_skip_handler;
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sa.sa_flags = SA_SIGINFO | SA_ONSTACK;
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sigemptyset(&sa.sa_mask);
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sigaction(SIGABRT, &sa, nullptr);
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sigaction(SIGTRAP, &sa, nullptr);
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LOGI("fatal skip handlers (ABRT+TRAP→LR)");
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}
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static void install_promon_segv_handler() {
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refresh_promon_so_range();
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struct sigaction sa {};
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sa.sa_sigaction = promon_segv_handler;
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sa.sa_flags = SA_SIGINFO | SA_ONSTACK;
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sigemptyset(&sa.sa_mask);
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if (sigaction(SIGSEGV, &sa, nullptr) != 0) {
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LOGE("SIGSEGV handler install failed errno=%d", errno);
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return;
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}
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LOGI("promon SIGSEGV handler armed range=%lx-%lx",
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(unsigned long)g_promon_start.load(),
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(unsigned long)g_promon_end.load());
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}
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static void install_soft_signals() {
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struct sigaction sa {};
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sa.sa_sigaction = fatal_skip_handler;
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sa.sa_flags = SA_SIGINFO | SA_ONSTACK;
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sigemptyset(&sa.sa_mask);
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sigaction(SIGABRT, &sa, nullptr);
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sigaction(SIGTRAP, &sa, nullptr);
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if (g_soft_sig_logged.fetch_add(1) == 0) {
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LOGI("soft signals (ABRT+TRAP skip→LR)");
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}
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}
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#if defined(__aarch64__)
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#define _BPFI(code, jt, jf, k) \
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((struct sock_filter){(unsigned short)(code), (jt), (jf), (unsigned int)(k)})
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static int install_seccomp_exit_group_only() {
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struct sock_filter filter[] = {
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_BPFI(BPF_LD | BPF_W | BPF_ABS, 0, 0, offsetof(struct seccomp_data, arch)),
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_BPFI(BPF_JMP | BPF_JEQ | BPF_K, 1, 0, AUDIT_ARCH_AARCH64),
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_BPFI(BPF_RET | BPF_K, 0, 0, SC_RET_ALLOW),
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_BPFI(BPF_LD | BPF_W | BPF_ABS, 0, 0, offsetof(struct seccomp_data, nr)),
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_BPFI(BPF_JMP | BPF_JEQ | BPF_K, 0, 1, 94),
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_BPFI(BPF_RET | BPF_K, 0, 0, SC_RET_ERRNO_EPERM),
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_BPFI(BPF_RET | BPF_K, 0, 0, SC_RET_ALLOW),
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};
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struct sock_fprog prog = {
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.len = (unsigned short)(sizeof(filter) / sizeof(filter[0])),
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.filter = filter,
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};
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prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
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long rc = syscall(__NR_seccomp, SECCOMP_SET_MODE_FILTER,
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SECCOMP_FILTER_FLAG_TSYNC, &prog);
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if (rc != 0) {
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rc = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
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if (rc != 0) {
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LOGE("seccomp failed errno=%d", errno);
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return -1;
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}
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LOGI("seccomp exit_group via prctl");
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} else {
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LOGI("seccomp exit_group via TSYNC");
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}
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g_seccomp_ok.store(1);
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return 0;
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}
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#else
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static int install_seccomp_exit_group_only() { return -1; }
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#endif
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using exit_fn = void (*)(int);
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using kill_fn = int (*)(pid_t, int);
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using tgkill_fn = int (*)(int, int, int);
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using raise_fn = int (*)(int);
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using pthread_kill_fn = int (*)(pthread_t, int);
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static exit_fn orig_exit = nullptr;
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static exit_fn orig__exit = nullptr;
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static void (*orig_abort)() = nullptr;
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static void (*orig_stack_chk_fail)() = nullptr;
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static kill_fn orig_kill = nullptr;
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static tgkill_fn orig_tgkill = nullptr;
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static raise_fn orig_raise = nullptr;
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static pthread_kill_fn orig_pthread_kill = nullptr;
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static bool deadly(int sig) {
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return sig == SIGKILL || sig == SIGABRT || sig == SIGTERM ||
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sig == SIGTRAP || sig == SIGILL ||
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sig == 9 || sig == 6 || sig == 5 || sig == 4 || sig == 15;
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}
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static void hooked_exit(int code) { LOGI("blocked exit(%d)", code); }
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static void hooked__exit(int code) { LOGI("blocked _exit(%d)", code); }
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static void hooked_abort() {
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LOGI("blocked abort() tid=%d", (int)gettid());
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}
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static void hooked_stack_chk_fail() {
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int n = ++g_stack_chk;
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LOGI("blocked __stack_chk_fail tid=%d n=%d", (int)gettid(), n);
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}
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static int hooked_raise(int sig) {
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if (deadly(sig)) {
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LOGI("blocked raise(%d)", sig);
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return 0;
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}
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return orig_raise ? orig_raise(sig) : -1;
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}
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static int hooked_kill(pid_t pid, int sig) {
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if (deadly(sig)) {
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LOGI("blocked kill(%d,%d)", (int)pid, sig);
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return 0;
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}
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return orig_kill ? orig_kill(pid, sig) : -1;
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}
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static int hooked_tgkill(int tgid, int tid, int sig) {
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if (deadly(sig)) {
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LOGI("blocked tgkill(%d,%d,%d)", tgid, tid, sig);
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return 0;
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}
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return orig_tgkill ? orig_tgkill(tgid, tid, sig) : -1;
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}
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static int hooked_pthread_kill(pthread_t thread, int sig) {
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if (deadly(sig)) {
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LOGI("blocked pthread_kill(sig=%d)", sig);
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return 0;
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}
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return orig_pthread_kill ? orig_pthread_kill(thread, sig) : -1;
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}
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static bool find_libc(dev_t *dev, ino_t *ino) {
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FILE *fp = fopen("/proc/self/maps", "r");
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if (!fp) return false;
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char line[1024];
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bool ok = false;
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while (fgets(line, sizeof(line), fp)) {
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uintptr_t start = 0, end = 0;
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char perms[8] = {};
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unsigned long long offset = 0;
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char deststr[32] = {};
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unsigned long inode = 0;
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char path[512] = {};
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int n = sscanf(line, "%lx-%lx %7s %llx %31s %lu %511[^\n]",
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&start, &end, perms, &offset, deststr, &inode, path);
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if (n < 7 || inode == 0) continue;
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char *p = path;
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while (*p == ' ') ++p;
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if (strstr(p, "libc.so") == nullptr) continue;
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unsigned maj = 0, min = 0;
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if (sscanf(deststr, "%x:%x", &maj, &min) != 2) continue;
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*dev = makedev(maj, min);
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*ino = inode;
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ok = true;
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break;
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}
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fclose(fp);
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return ok;
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}
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static void install_plt(zygisk::Api *api) {
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if (!api) return;
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dev_t dev = 0;
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ino_t ino = 0;
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if (!find_libc(&dev, &ino)) return;
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api->pltHookRegister(dev, ino, "exit", (void *)hooked_exit, (void **)&orig_exit);
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api->pltHookRegister(dev, ino, "_exit", (void *)hooked__exit, (void **)&orig__exit);
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api->pltHookRegister(dev, ino, "abort", (void *)hooked_abort, (void **)&orig_abort);
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api->pltHookRegister(dev, ino, "__stack_chk_fail",
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(void *)hooked_stack_chk_fail, (void **)&orig_stack_chk_fail);
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api->pltHookRegister(dev, ino, "raise", (void *)hooked_raise, (void **)&orig_raise);
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api->pltHookRegister(dev, ino, "kill", (void *)hooked_kill, (void **)&orig_kill);
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api->pltHookRegister(dev, ino, "tgkill", (void *)hooked_tgkill, (void **)&orig_tgkill);
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api->pltHookRegister(dev, ino, "pthread_kill",
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(void *)hooked_pthread_kill, (void **)&orig_pthread_kill);
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bool ok = api->pltHookCommit();
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LOGI("PLT commit=%d", ok ? 1 : 0);
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}
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static void *phase_thread(void *) {
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install_promon_segv_handler();
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usleep(400 * 1000);
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install_seccomp_exit_group_only();
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LOGI("seccomp armed @400ms ok=%d", g_seccomp_ok.load());
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for (int i = 0; i < 40; i++) {
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usleep(1000 * 1000);
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install_soft_signals();
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if (i % 5 == 0) refresh_promon_so_range();
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}
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LOGI("phase done seccomp=%d stack_chk=%d promon_segv=%d",
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g_seccomp_ok.load(), g_stack_chk.load(), g_promon_segv.load());
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return nullptr;
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}
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static void install_all(zygisk::Api *api) {
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LOGI("install pid=%d (PLT+ABRT/TRAP-skip+pc==lr-SEGV+exit_group@400ms)", getpid());
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install_fatal_skip_handlers();
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install_soft_signals();
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install_plt(api);
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pthread_t th;
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if (pthread_create(&th, nullptr, phase_thread, nullptr) == 0) {
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pthread_detach(th);
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}
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LOGI("ready");
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}
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class TngExitGuardModule : public zygisk::ModuleBase {
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public:
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void onLoad(zygisk::Api *api, JNIEnv *env) override {
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this->api = api;
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this->env = env;
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}
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void preAppSpecialize(zygisk::AppSpecializeArgs *args) override {
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const char *nice = nullptr;
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if (args->nice_name) {
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nice = env->GetStringUTFChars(args->nice_name, nullptr);
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}
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bool match = nice && (
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std::strncmp(nice, kTargetPkg, std::strlen(kTargetPkg)) == 0);
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if (nice) env->ReleaseStringUTFChars(args->nice_name, nice);
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g_enabled = match;
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if (!match) {
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api->setOption(zygisk::Option::DLCLOSE_MODULE_LIBRARY);
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return;
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}
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LOGI("preAppSpecialize matched");
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}
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void postAppSpecialize(const zygisk::AppSpecializeArgs *args) override {
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(void)args;
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if (!g_enabled) return;
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install_all(api);
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}
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private:
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zygisk::Api *api = nullptr;
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JNIEnv *env = nullptr;
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};
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REGISTER_ZYGISK_MODULE(TngExitGuardModule)
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