├── .gitignore ├── .travis.yml ├── Android.mk ├── Application.mk ├── LICENSE ├── Makefile ├── README.md └── src ├── include ├── config.h ├── injector.h ├── ptrace.h └── utils.h ├── injector.c ├── main.c ├── ptrace.c └── utils.c /.gitignore: -------------------------------------------------------------------------------- 1 | build/ 2 | -------------------------------------------------------------------------------- /.travis.yml: -------------------------------------------------------------------------------- 1 | language: c 2 | before_install: 3 | - wget http://dl.google.com/android/ndk/android-ndk-r10e-linux-x86_64.bin 4 | - chmod +x android-ndk-r10e-linux-x86_64.bin 5 | - ./android-ndk-r10e-linux-x86_64.bin > /dev/null 6 | - export PATH=$PATH:`pwd`/android-ndk-r10e 7 | script: 8 | - make -------------------------------------------------------------------------------- /Android.mk: -------------------------------------------------------------------------------- 1 | LOCAL_PATH := $(call my-dir) 2 | 3 | include $(CLEAR_VARS) 4 | 5 | LOCAL_MODULE := injector 6 | LOCAL_SRC_FILES := $(subst $(LOCAL_PATH)/,,$(wildcard $(LOCAL_PATH)/src/*.c)) 7 | LOCAL_C_INCLUDES += $(LOCAL_PATH)/src/include 8 | LOCAL_LDFLAGS += -pie 9 | 10 | include $(BUILD_EXECUTABLE) 11 | -------------------------------------------------------------------------------- /Application.mk: -------------------------------------------------------------------------------- 1 | APP_ABI := armeabi-v7a arm64-v8a 2 | APP_BUILD_SCRIPT := ./Android.mk 3 | APP_CFLAGS := -fPIE -std=c99 4 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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We also recommend that a 185 | file or class name and description of purpose be included on the 186 | same "printed page" as the copyright notice for easier 187 | identification within third-party archives. 188 | 189 | Copyright {yyyy} {name of copyright owner} 190 | 191 | Licensed under the Apache License, Version 2.0 (the "License"); 192 | you may not use this file except in compliance with the License. 193 | You may obtain a copy of the License at 194 | 195 | http://www.apache.org/licenses/LICENSE-2.0 196 | 197 | Unless required by applicable law or agreed to in writing, software 198 | distributed under the License is distributed on an "AS IS" BASIS, 199 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 200 | See the License for the specific language governing permissions and 201 | limitations under the License. 202 | -------------------------------------------------------------------------------- /Makefile: -------------------------------------------------------------------------------- 1 | all: 2 | @ndk-build -B\ 3 | NDK_PROJECT_PATH=.\ 4 | NDK_APPLICATION_MK=./Application.mk\ 5 | NDK_APP_DST_DIR=./build/\ 6 | NDK_APP_OUT=./build/ \ 7 | APP_BUILD_SCRIPT=./Android.mk 8 | clean: 9 | @rm -rf ./build 10 | install: 11 | @adb push build/injector /sdcard/ 12 | @adb shell su -c "cp /storage/emulated/0/injector /data/local/" 13 | @adb shell su -c "chmod 777 /data/local/injector" 14 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # TinyInjector 2 | [![Build Status](https://travis-ci.org/Shunix/TinyInjector.svg?branch=master)](https://travis-ci.org/Shunix/TinyInjector) 3 | 4 | Shared Library Injector on Android 5 | -------------------------------------------------------------------------------- /src/include/config.h: -------------------------------------------------------------------------------- 1 | #ifndef CONFIG_H_ 2 | #define CONFIG_H_ 3 | #define DEBUG 1 4 | #endif 5 | -------------------------------------------------------------------------------- /src/include/injector.h: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | #ifndef INJECTOR_H_ 4 | #define INJECTOR_H_ 5 | 6 | #if defined(__aarch64__) 7 | #define LIBC_PATH_OLD "/system/lib64/libc.so" 8 | #define LIBC_PATH_NEW "/apex/com.android.runtime/lib64/bionic/libc.so" 9 | #define LINKER_PATH_OLD "/system/lib64/libdl.so" 10 | #define LINKER_PATH_NEW "/apex/com.android.runtime/lib64/bionic/libdl.so" 11 | #define VNDK_LIB_PATH "/system/lib64/libRS.so" 12 | #else 13 | #define LIBC_PATH_OLD "/system/lib/libc.so" 14 | #define LIBC_PATH_NEW "/apex/com.android.runtime/lib/bionic/libc.so" 15 | #define LINKER_PATH_OLD "/system/lib/libdl.so" 16 | #define LINKER_PATH_NEW "/apex/com.android.runtime/lib/bionic/libdl.so" 17 | #define VNDK_LIB_PATH "/system/lib/libRS.so" 18 | #endif 19 | 20 | long CallMmap(pid_t pid, size_t length); 21 | long CallDlopen(pid_t pid, const char* library_path); 22 | long CallDlsym(pid_t pid, long so_handle, const char* symbol); 23 | long CallDlclose(pid_t pid, long so_handle); 24 | long InjectLibrary(pid_t pid, const char* library_path); 25 | #endif 26 | -------------------------------------------------------------------------------- /src/include/ptrace.h: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | #ifndef PTRACE_H_ 4 | #define PTRACE_H_ 5 | #define CPSR_T_MASK (1u << 5) 6 | 7 | int PtraceAttach(pid_t pid); 8 | int PtraceDetach(pid_t pid); 9 | void PtraceWrite(pid_t pid, uint8_t* addr, uint8_t* data, size_t size); 10 | long CallRemoteFunction(pid_t pid, long function_addr, long* args, size_t argc); // call function in remote process 11 | long CallRemoteFunctionFromNamespace(pid_t pid, long function_addr, long namespace_addr, long* args, size_t argc); 12 | #endif 13 | -------------------------------------------------------------------------------- /src/include/utils.h: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | 4 | #ifndef UTILS_H_ 5 | #define UTILS_H_ 6 | pid_t GetPid(const char* process_name); // get pid of specified process 7 | bool IsSelinuxEnabled(); // check the status of SELinux 8 | void DisableSelinux(); // disable SELinux 9 | long GetModuleBaseAddr(pid_t pid, const char* module_name); // get base address of specified module in given process 10 | long GetRemoteFuctionAddr(pid_t remote_pid, const char* module_name, long local_function_addr); // get fuction address in remote process 11 | #endif 12 | -------------------------------------------------------------------------------- /src/injector.c: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | #include 4 | #include "config.h" 5 | #include "injector.h" 6 | #include "ptrace.h" 7 | #include "utils.h" 8 | #include 9 | 10 | static int android_os_version = -1; 11 | 12 | int GetOSVersion() 13 | { 14 | if (android_os_version != -1) { 15 | return android_os_version; 16 | } 17 | 18 | char os_version[PROP_VALUE_MAX + 1]; 19 | int os_version_length = __system_property_get("ro.build.version.release", os_version); 20 | android_os_version = atoi(os_version); 21 | 22 | return android_os_version; 23 | } 24 | 25 | const char* GetLibcPath() 26 | { 27 | if (GetOSVersion() >= 10) { 28 | return LIBC_PATH_NEW; 29 | } else { 30 | return LIBC_PATH_OLD; 31 | } 32 | } 33 | 34 | const char* GetLinkerPath() 35 | { 36 | if (GetOSVersion() >= 10) { 37 | return LINKER_PATH_NEW; 38 | } else { 39 | return LINKER_PATH_OLD; 40 | } 41 | } 42 | 43 | long CallMmap(pid_t pid, size_t length) { 44 | long function_addr = GetRemoteFuctionAddr(pid, GetLibcPath(), ((long) (void*)mmap)); 45 | long params[6]; 46 | params[0] = 0; 47 | params[1] = length; 48 | params[2] = PROT_READ | PROT_WRITE; 49 | params[3] = MAP_PRIVATE | MAP_ANONYMOUS; 50 | params[4] = 0; 51 | params[5] = 0; 52 | if (DEBUG) { 53 | printf("mmap called, function address %lx process %d size %zu\n", function_addr, pid, length); 54 | } 55 | return CallRemoteFunction(pid, function_addr, params, 6); 56 | } 57 | 58 | long CallMunmap(pid_t pid, long addr, size_t length) { 59 | long function_addr = GetRemoteFuctionAddr(pid, GetLibcPath(), ((long) (void*)munmap)); 60 | long params[2]; 61 | params[0] = addr; 62 | params[1] = length; 63 | if (DEBUG) { 64 | printf("munmap called, function address %lx process %d address %lx size %zu\n", function_addr, pid, addr, length); 65 | } 66 | return CallRemoteFunction(pid, function_addr, params, 2); 67 | } 68 | 69 | long CallDlopen(pid_t pid, const char* library_path) { 70 | long function_addr = GetRemoteFuctionAddr(pid, GetLinkerPath(), ((long) (void*)dlopen)); 71 | long mmap_ret = CallMmap(pid, 0x400); 72 | PtraceWrite(pid, (uint8_t*)mmap_ret, (uint8_t*)library_path, strlen(library_path) + 1); 73 | long params[2]; 74 | params[0] = mmap_ret; 75 | params[1] = RTLD_NOW | RTLD_LOCAL; 76 | if (DEBUG) { 77 | printf("dlopen called, function address %lx process %d library path %s\n", function_addr, pid, library_path); 78 | } 79 | long vndk_return_addr = GetModuleBaseAddr(pid, VNDK_LIB_PATH); 80 | long ret = CallRemoteFunctionFromNamespace(pid, function_addr, vndk_return_addr, params, 2); 81 | CallMunmap(pid, mmap_ret, 0x400); 82 | return ret; 83 | } 84 | 85 | long CallDlsym(pid_t pid, long so_handle, const char* symbol) { 86 | long function_addr = GetRemoteFuctionAddr(pid, GetLinkerPath(), ((long) (void*)dlsym)); 87 | long mmap_ret = CallMmap(pid, 0x400); 88 | PtraceWrite(pid, (uint8_t*)mmap_ret, (uint8_t*)symbol, strlen(symbol) + 1); 89 | long params[2]; 90 | params[0] = so_handle; 91 | params[1] = mmap_ret; 92 | if (DEBUG) { 93 | printf("dlsym called, function address %lx process %d so handle %lx symbol name %s\n", function_addr, pid, so_handle, symbol); 94 | } 95 | long ret = CallRemoteFunction(pid, function_addr, params, 2); 96 | CallMunmap(pid, mmap_ret, 0x400); 97 | return ret; 98 | } 99 | 100 | long CallDlclose(pid_t pid, long so_handle) { 101 | long function_addr = GetRemoteFuctionAddr(pid, GetLinkerPath(), ((long) (void*)dlclose)); 102 | long params[1]; 103 | params[0] = so_handle; 104 | if (DEBUG) { 105 | printf("dlclose called, function address %lx process %d so handle %lx\n", function_addr, pid, so_handle); 106 | } 107 | return CallRemoteFunction(pid, function_addr, params, 1); 108 | } 109 | 110 | long InjectLibrary(pid_t pid, const char* library_path) { 111 | if (DEBUG) { 112 | printf("Injection started...\n"); 113 | } 114 | PtraceAttach(pid); 115 | long so_handle = CallDlopen(pid, library_path); 116 | if (DEBUG) { 117 | if (!so_handle) { 118 | printf("Injection failed...\n"); 119 | } else { 120 | printf("Injection ended succesfully...\n"); 121 | } 122 | } 123 | 124 | PtraceDetach(pid); 125 | return so_handle; 126 | } 127 | -------------------------------------------------------------------------------- /src/main.c: -------------------------------------------------------------------------------- 1 | #include 2 | #include "config.h" 3 | #include "injector.h" 4 | #include "utils.h" 5 | 6 | int main(int argc, char const *argv[]) { 7 | if (argc != 3) { 8 | printf("Usage: %s [process name] [library path]\n", argv[0]); 9 | return -1; 10 | } 11 | 12 | const char* process_name = argv[1]; 13 | const char* library_path = argv[2]; 14 | pid_t pid = GetPid(process_name); 15 | if (DEBUG) { 16 | printf("process name: %s, library path: %s, pid: %d\n", process_name, library_path, pid); 17 | } 18 | 19 | if (IsSelinuxEnabled()) { 20 | DisableSelinux(); 21 | } 22 | 23 | InjectLibrary(pid, library_path); 24 | return 0; 25 | } 26 | -------------------------------------------------------------------------------- /src/ptrace.c: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | #include 4 | #include 5 | #include "config.h" 6 | #include "ptrace.h" 7 | 8 | #if defined(__aarch64__) 9 | #define pt_regs user_pt_regs 10 | #define uregs regs 11 | #define ARM_r0 regs[0] 12 | #define ARM_lr regs[30] 13 | #define ARM_sp sp 14 | #define ARM_pc pc 15 | #define ARM_cpsr pstate 16 | #endif 17 | 18 | static void PtraceGetRegs(pid_t pid, struct pt_regs *regs); 19 | static void PtraceSetRegs(pid_t pid, struct pt_regs *regs); 20 | static void PtraceCont(pid_t pid); 21 | 22 | int PtraceAttach(pid_t pid) { 23 | if (pid == -1) { 24 | return -1; 25 | } 26 | if (ptrace(PTRACE_ATTACH, pid, NULL, NULL) < 0) { 27 | perror(NULL); 28 | return -1; 29 | } 30 | waitpid(pid, NULL, WUNTRACED); 31 | if (DEBUG) { 32 | printf("Attached to process %d\n", pid); 33 | } 34 | return 0; 35 | } 36 | 37 | int PtraceDetach(pid_t pid) { 38 | if (pid == -1) { 39 | return -1; 40 | } 41 | if (ptrace(PTRACE_DETACH, pid, NULL, NULL) < 0) { 42 | perror(NULL); 43 | return -1; 44 | } 45 | if (DEBUG) { 46 | printf("Detached from process %d\n", pid); 47 | } 48 | return 0; 49 | } 50 | 51 | void PtraceWrite(pid_t pid, uint8_t* addr, uint8_t* data, size_t size) { 52 | const size_t WORD_SIZE = sizeof(long); 53 | int mod = size % WORD_SIZE; 54 | int loop_count = size / WORD_SIZE; 55 | uint8_t* tmp_addr = addr; 56 | uint8_t* tmp_data = data; 57 | for(int i = 0; i < loop_count; ++i) { 58 | ptrace(PTRACE_POKEDATA, pid, tmp_addr, *((long*)tmp_data)); 59 | tmp_addr += WORD_SIZE; 60 | tmp_data += WORD_SIZE; 61 | } 62 | if (mod > 0) { 63 | long val = ptrace(PTRACE_PEEKDATA, pid, tmp_addr, NULL); 64 | uint8_t* p = (uint8_t*) &val; 65 | for(int i = 0; i < mod; ++i) { 66 | *p = *(tmp_data); 67 | p++; 68 | tmp_data++; 69 | } 70 | ptrace(PTRACE_POKEDATA, pid, tmp_addr, val); 71 | } 72 | if (DEBUG) { 73 | printf("Write %zu bytes to %p process %d\n", size, addr, pid); 74 | } 75 | } 76 | 77 | static void PtraceGetRegs(pid_t pid, struct pt_regs *regs) { 78 | #if defined(__aarch64__) 79 | struct { 80 | void* ufb; 81 | size_t len; 82 | } regsvec = { regs, sizeof(struct pt_regs) }; 83 | 84 | ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, ®svec); 85 | #else 86 | ptrace(PTRACE_GETREGS, pid, NULL, regs); 87 | #endif 88 | } 89 | 90 | static void PtraceSetRegs(pid_t pid, struct pt_regs *regs) { 91 | #if defined(__aarch64__) 92 | struct { 93 | void* ufb; 94 | size_t len; 95 | } regsvec = { regs, sizeof(struct pt_regs) }; 96 | 97 | ptrace(PTRACE_SETREGSET, pid, NT_PRSTATUS, ®svec); 98 | #else 99 | ptrace(PTRACE_SETREGS, pid, NULL, regs); 100 | #endif 101 | } 102 | 103 | static void PtraceCont(pid_t pid) { 104 | ptrace(PTRACE_CONT, pid, NULL, NULL); 105 | } 106 | 107 | long CallRemoteFunction(pid_t pid, long function_addr, long* args, size_t argc) { 108 | return CallRemoteFunctionFromNamespace(pid, function_addr, 0, args, argc); 109 | } 110 | 111 | long CallRemoteFunctionFromNamespace(pid_t pid, long function_addr, long return_addr, long* args, size_t argc) { 112 | #if defined(__aarch64__) 113 | #define REGS_ARG_NUM 6 114 | #else 115 | #define REGS_ARG_NUM 4 116 | #endif 117 | 118 | struct pt_regs regs; 119 | // backup the original regs 120 | struct pt_regs backup_regs; 121 | 122 | PtraceGetRegs(pid, ®s); 123 | memcpy(&backup_regs, ®s, sizeof(struct pt_regs)); 124 | // put the first 4 args to r0-r3 125 | for(int i = 0; i < argc && i < REGS_ARG_NUM; ++i) { 126 | regs.uregs[i] = args[i]; 127 | } 128 | // push the remainder to stack 129 | if (argc > REGS_ARG_NUM) { 130 | regs.ARM_sp -= (argc - REGS_ARG_NUM) * sizeof(long); 131 | long* data = args + REGS_ARG_NUM; 132 | PtraceWrite(pid, (uint8_t*)regs.ARM_sp, (uint8_t*)data, (argc - REGS_ARG_NUM) * sizeof(long)); 133 | } 134 | // set return addr to 0, so we could catch SIGSEGV 135 | regs.ARM_lr = return_addr; 136 | regs.ARM_pc = function_addr; 137 | 138 | #if !defined(__aarch64__) 139 | if (regs.ARM_pc & 1) { 140 | // thumb 141 | regs.ARM_pc &= (~1u); 142 | regs.ARM_cpsr |= CPSR_T_MASK; 143 | } else { 144 | // arm 145 | regs.ARM_cpsr &= ~CPSR_T_MASK; 146 | } 147 | #endif 148 | 149 | PtraceSetRegs(pid, ®s); 150 | PtraceCont(pid); 151 | 152 | waitpid(pid, NULL, WUNTRACED); 153 | 154 | // to get return value; 155 | PtraceGetRegs(pid, ®s); 156 | PtraceSetRegs(pid, &backup_regs); 157 | // Fuction return value 158 | if (DEBUG) { 159 | printf("Call remote function %lx with %zu arguments, return value is %llx\n", 160 | function_addr, argc, (long long)regs.ARM_r0); 161 | } 162 | return regs.ARM_r0; 163 | } 164 | -------------------------------------------------------------------------------- /src/utils.c: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | #include 4 | #include 5 | #include 6 | #include "config.h" 7 | #include "utils.h" 8 | 9 | pid_t GetPid(const char* process_name) { 10 | if (process_name == NULL) { 11 | return -1; 12 | } 13 | DIR* dir = opendir("/proc"); 14 | if (dir == NULL) { 15 | return -1; 16 | } 17 | struct dirent* entry; 18 | while((entry = readdir(dir)) != NULL) { 19 | size_t pid = atoi(entry->d_name); 20 | if (pid != 0) { 21 | char file_name[30]; 22 | snprintf(file_name, 30, "/proc/%zu/cmdline", pid); 23 | FILE *fp = fopen(file_name, "r"); 24 | char temp_name[50]; 25 | if (fp != NULL) { 26 | fgets(temp_name, 50, fp); 27 | fclose(fp); 28 | if (strcmp(process_name, temp_name) == 0) { 29 | return pid; 30 | } 31 | } 32 | } 33 | } 34 | return -1; 35 | } 36 | 37 | bool IsSelinuxEnabled() { 38 | FILE* fp = fopen("/proc/filesystems", "r"); 39 | char* line = (char*) calloc(50, sizeof(char)); 40 | bool result = false; 41 | while(fgets(line, 50, fp)) { 42 | if (strstr(line, "selinuxfs")) { 43 | result = true; 44 | } 45 | } 46 | if (line) { 47 | free(line); 48 | } 49 | fclose(fp); 50 | return result; 51 | } 52 | 53 | void DisableSelinux() { 54 | FILE* fp = fopen("/proc/mounts", "r"); 55 | char* line = (char*) calloc(1024, sizeof(char)); 56 | while(fgets(line, 1024, fp)) { 57 | if (strstr(line, "selinuxfs")) { 58 | strtok(line, " "); 59 | char* selinux_dir = strtok(NULL, " "); 60 | char* selinux_path = strcat(selinux_dir, "/enforce"); 61 | FILE* fp_selinux = fopen(selinux_path, "w"); 62 | char* buf = "0"; // set selinux to permissive 63 | fwrite(buf, strlen(buf), 1, fp_selinux); 64 | fclose(fp_selinux); 65 | break; 66 | } 67 | } 68 | fclose(fp); 69 | if (line) { 70 | free(line); 71 | } 72 | } 73 | 74 | long GetModuleBaseAddr(pid_t pid, const char* module_name) { 75 | long base_addr_long = 0; 76 | if (pid == -1) { 77 | return 0; 78 | } 79 | char* file_name = (char*) calloc(50, sizeof(char)); 80 | snprintf(file_name, 50, "/proc/%d/maps", pid); 81 | FILE* fp = fopen(file_name, "r"); 82 | free(file_name); 83 | char line[512]; 84 | if (fp != NULL) { 85 | while(fgets(line, 512, fp) != NULL) { 86 | if (strstr(line, module_name) != NULL) { 87 | char* base_addr = strtok(line, "-"); 88 | base_addr_long = strtoul(base_addr, NULL, 16); 89 | break; 90 | } 91 | } 92 | fclose(fp); 93 | } 94 | return base_addr_long; 95 | } 96 | 97 | long GetRemoteFuctionAddr(pid_t remote_pid, const char* module_name, long local_function_addr) { 98 | pid_t pid = getpid(); 99 | long local_base_addr = GetModuleBaseAddr(pid, module_name); 100 | long remote_base_addr = GetModuleBaseAddr(remote_pid, module_name); 101 | if (local_base_addr == 0 || remote_base_addr == 0) { 102 | return 0; 103 | } 104 | return local_function_addr + (remote_base_addr - local_base_addr); 105 | } 106 | --------------------------------------------------------------------------------