• Android中实现对/system/bin/surfaceflinger进程进行拦截和注入


    对于Android for arm上的so注入(inject)和挂钩(hook),网上已有牛人给出了代码inject。由于实现中的ptrace函数是依赖于平台的,所以不经改动只能用于arm平台。本文将之扩展了一下,使它能够通用于Android的x86和arm平台。Arm平台部分基本重用了inject中的代码,其中因为汇编不好移植且容易出错,所以把shellcode.s用ptrace_call替换掉了,另外保留了mmap,用来传字符串参数,当然也可以通过栈来传,但栈里和其它东西混一起,一弄不好就会隔儿了,所以还是保险点好。最后注意设备要root。

    还有就是要在Linux中配置一下NDK编译环境呀~~(这个可以google了~~)


    首先创建目录及文件:

    文件夹:jni

    文件:
        inject.c
        Android.mk
        Application.mk

    (说明:由于NDK编译的条件限制,所以我们需要创建的jni文件夹,当然这个文件的名字必须是jni)

    注入的核心源代码:

    inject.c

    #include <stdio.h>    
    #include <stdlib.h>    
    #include <asm/user.h>    
    #include <asm/ptrace.h>    
    #include <sys/ptrace.h>    
    #include <sys/wait.h>    
    #include <sys/mman.h>    
    #include <dlfcn.h>    
    #include <dirent.h>    
    #include <unistd.h>    
    #include <string.h>    
    #include <elf.h>    
    #include <android/log.h>    
        
    #if defined(__i386__)    
    #define pt_regs         user_regs_struct    
    #endif    
        
    #define ENABLE_DEBUG 1    
        
    #if ENABLE_DEBUG    
    #define  LOG_TAG "INJECT"    
    #define  LOGD(fmt, args...)  __android_log_print(ANDROID_LOG_DEBUG,LOG_TAG, fmt, ##args)    
    #define DEBUG_PRINT(format,args...)     
        LOGD(format, ##args)    
    #else    
    #define DEBUG_PRINT(format,args...)    
    #endif    
        
    #define CPSR_T_MASK     ( 1u << 5 )    
        
    const char *libc_path = "/system/lib/libc.so";    
    const char *linker_path = "/system/bin/linker";    
        
    int ptrace_readdata(pid_t pid,  uint8_t *src, uint8_t *buf, size_t size)    
    {    
        uint32_t i, j, remain;    
        uint8_t *laddr;    
        
        union u {    
            long val;    
            char chars[sizeof(long)];    
        } d;    
        
        j = size / 4;    
        remain = size % 4;    
        
        laddr = buf;    
        
        for (i = 0; i < j; i ++) {    
            d.val = ptrace(PTRACE_PEEKTEXT, pid, src, 0);    
            memcpy(laddr, d.chars, 4);    
            src += 4;    
            laddr += 4;    
        }    
        
        if (remain > 0) {    
            d.val = ptrace(PTRACE_PEEKTEXT, pid, src, 0);    
            memcpy(laddr, d.chars, remain);    
        }    
        
        return 0;    
    }    
        
    int ptrace_writedata(pid_t pid, uint8_t *dest, uint8_t *data, size_t size)    
    {    
        uint32_t i, j, remain;    
        uint8_t *laddr;    
        
        union u {    
            long val;    
            char chars[sizeof(long)];    
        } d;    
        
        j = size / 4;    
        remain = size % 4;    
        
        laddr = data;    
        
        for (i = 0; i < j; i ++) {    
            memcpy(d.chars, laddr, 4);    
            ptrace(PTRACE_POKETEXT, pid, dest, d.val);    
        
            dest  += 4;    
            laddr += 4;    
        }    
        
        if (remain > 0) {    
            d.val = ptrace(PTRACE_PEEKTEXT, pid, dest, 0);    
            for (i = 0; i < remain; i ++) {    
                d.chars[i] = *laddr ++;    
            }    
        
            ptrace(PTRACE_POKETEXT, pid, dest, d.val);    
        }    
        
        return 0;    
    }    
        
    #if defined(__arm__)    
    int ptrace_call(pid_t pid, uint32_t addr, long *params, uint32_t num_params, struct pt_regs* regs)    
    {    
        uint32_t i;    
        for (i = 0; i < num_params && i < 4; i ++) {    
            regs->uregs[i] = params[i];    
        }    
        
        //    
        // push remained params onto stack    
        //    
        if (i < num_params) {    
            regs->ARM_sp -= (num_params - i) * sizeof(long) ;    
            ptrace_writedata(pid, (void *)regs->ARM_sp, (uint8_t *)¶ms[i], (num_params - i) * sizeof(long));    
        }    
        
        regs->ARM_pc = addr;    
        if (regs->ARM_pc & 1) {    
            /* thumb */    
            regs->ARM_pc &= (~1u);    
            regs->ARM_cpsr |= CPSR_T_MASK;    
        } else {    
            /* arm */    
            regs->ARM_cpsr &= ~CPSR_T_MASK;    
        }    
        
        regs->ARM_lr = 0;        
        
        if (ptrace_setregs(pid, regs) == -1     
                || ptrace_continue(pid) == -1) {    
            printf("error
    ");    
            return -1;    
        }    
        
        int stat = 0;  
        waitpid(pid, &stat, WUNTRACED);  
        while (stat != 0xb7f) {  
            if (ptrace_continue(pid) == -1) {  
                printf("error
    ");  
                return -1;  
            }  
            waitpid(pid, &stat, WUNTRACED);  
        }  
        
        return 0;    
    }    
        
    #elif defined(__i386__)    
    long ptrace_call(pid_t pid, uint32_t addr, long *params, uint32_t num_params, struct user_regs_struct * regs)    
    {    
        regs->esp -= (num_params) * sizeof(long) ;    
        ptrace_writedata(pid, (void *)regs->esp, (uint8_t *)params, (num_params) * sizeof(long));    
        
        long tmp_addr = 0x00;    
        regs->esp -= sizeof(long);    
        ptrace_writedata(pid, regs->esp, (char *)&tmp_addr, sizeof(tmp_addr));     
        
        regs->eip = addr;    
        
        if (ptrace_setregs(pid, regs) == -1     
                || ptrace_continue( pid) == -1) {    
            printf("error
    ");    
            return -1;    
        }    
        
        int stat = 0;  
        waitpid(pid, &stat, WUNTRACED);  
        while (stat != 0xb7f) {  
            if (ptrace_continue(pid) == -1) {  
                printf("error
    ");  
                return -1;  
            }  
            waitpid(pid, &stat, WUNTRACED);  
        }  
        
        return 0;    
    }    
    #else     
    #error "Not supported"    
    #endif    
        
    int ptrace_getregs(pid_t pid, struct pt_regs * regs)    
    {    
        if (ptrace(PTRACE_GETREGS, pid, NULL, regs) < 0) {    
            perror("ptrace_getregs: Can not get register values");    
            return -1;    
        }    
        
        return 0;    
    }    
        
    int ptrace_setregs(pid_t pid, struct pt_regs * regs)    
    {    
        if (ptrace(PTRACE_SETREGS, pid, NULL, regs) < 0) {    
            perror("ptrace_setregs: Can not set register values");    
            return -1;    
        }    
        
        return 0;    
    }    
        
    int ptrace_continue(pid_t pid)    
    {    
        if (ptrace(PTRACE_CONT, pid, NULL, 0) < 0) {    
            perror("ptrace_cont");    
            return -1;    
        }    
        
        return 0;    
    }    
        
    int ptrace_attach(pid_t pid)    
    {    
        if (ptrace(PTRACE_ATTACH, pid, NULL, 0) < 0) {    
            perror("ptrace_attach");    
            return -1;    
        }    
        
        int status = 0;    
        waitpid(pid, &status , WUNTRACED);    
        
        return 0;    
    }    
        
    int ptrace_detach(pid_t pid)    
    {    
        if (ptrace(PTRACE_DETACH, pid, NULL, 0) < 0) {    
            perror("ptrace_detach");    
            return -1;    
        }    
        
        return 0;    
    }    
        
    void* get_module_base(pid_t pid, const char* module_name)    
    {    
        FILE *fp;    
        long addr = 0;    
        char *pch;    
        char filename[32];    
        char line[1024];    
        
        if (pid < 0) {    
            /* self process */    
            snprintf(filename, sizeof(filename), "/proc/self/maps", pid);    
        } else {    
            snprintf(filename, sizeof(filename), "/proc/%d/maps", pid);    
        }    
        
        fp = fopen(filename, "r");    
        
        if (fp != NULL) {    
            while (fgets(line, sizeof(line), fp)) {    
                if (strstr(line, module_name)) {    
                    pch = strtok( line, "-" );    
                    addr = strtoul( pch, NULL, 16 );    
        
                    if (addr == 0x8000)    
                        addr = 0;    
        
                    break;    
                }    
            }    
        
            fclose(fp) ;    
        }    
        
        return (void *)addr;    
    }    
        
    void* get_remote_addr(pid_t target_pid, const char* module_name, void* local_addr)    
    {    
        void* local_handle, *remote_handle;    
        
        local_handle = get_module_base(-1, module_name);    
        remote_handle = get_module_base(target_pid, module_name);    
        
        DEBUG_PRINT("[+] get_remote_addr: local[%x], remote[%x]
    ", local_handle, remote_handle);    
        
        void * ret_addr = (void *)((uint32_t)local_addr + (uint32_t)remote_handle - (uint32_t)local_handle);    
        
    #if defined(__i386__)    
        if (!strcmp(module_name, libc_path)) {    
            ret_addr += 2;    
        }    
    #endif    
        return ret_addr;    
    }    
        
    int find_pid_of(const char *process_name)    
    {    
        int id;    
        pid_t pid = -1;    
        DIR* dir;    
        FILE *fp;    
        char filename[32];    
        char cmdline[256];    
        
        struct dirent * entry;    
        
        if (process_name == NULL)    
            return -1;    
        
        dir = opendir("/proc");    
        if (dir == NULL)    
            return -1;    
        
        while((entry = readdir(dir)) != NULL) {    
            id = atoi(entry->d_name);    
            if (id != 0) {    
                sprintf(filename, "/proc/%d/cmdline", id);    
                fp = fopen(filename, "r");    
                if (fp) {    
                    fgets(cmdline, sizeof(cmdline), fp);    
                    fclose(fp);    
        
                    if (strcmp(process_name, cmdline) == 0) {    
                        /* process found */    
                        pid = id;    
                        break;    
                    }    
                }    
            }    
        }    
        
        closedir(dir);    
        return pid;    
    }    
        
    long ptrace_retval(struct pt_regs * regs)    
    {    
    #if defined(__arm__)    
        return regs->ARM_r0;    
    #elif defined(__i386__)    
        return regs->eax;    
    #else    
    #error "Not supported"    
    #endif    
    }    
        
    long ptrace_ip(struct pt_regs * regs)    
    {    
    #if defined(__arm__)    
        return regs->ARM_pc;    
    #elif defined(__i386__)    
        return regs->eip;    
    #else    
    #error "Not supported"    
    #endif    
    }    
        
    int ptrace_call_wrapper(pid_t target_pid, const char * func_name, void * func_addr, long * parameters, int param_num, struct pt_regs * regs)     
    {    
        DEBUG_PRINT("[+] Calling %s in target process.
    ", func_name);    
        if (ptrace_call(target_pid, (uint32_t)func_addr, parameters, param_num, regs) == -1)    
            return -1;    
        
        if (ptrace_getregs(target_pid, regs) == -1)    
            return -1;    
        DEBUG_PRINT("[+] Target process returned from %s, return value=%x, pc=%x 
    ",     
                func_name, ptrace_retval(regs), ptrace_ip(regs));    
        return 0;    
    }    
        
    int inject_remote_process(pid_t target_pid, const char *library_path, const char *function_name, const char *param, size_t param_size)    
    {    
        int ret = -1;    
        void *mmap_addr, *dlopen_addr, *dlsym_addr, *dlclose_addr, *dlerror_addr;    
        void *local_handle, *remote_handle, *dlhandle;    
        uint8_t *map_base = 0;    
        uint8_t *dlopen_param1_ptr, *dlsym_param2_ptr, *saved_r0_pc_ptr, *inject_param_ptr, *remote_code_ptr, *local_code_ptr;    
        
        struct pt_regs regs, original_regs;    
        extern uint32_t _dlopen_addr_s, _dlopen_param1_s, _dlopen_param2_s, _dlsym_addr_s,     
            _dlsym_param2_s, _dlclose_addr_s, _inject_start_s, _inject_end_s, _inject_function_param_s,     
            _saved_cpsr_s, _saved_r0_pc_s;    
        
        uint32_t code_length;    
        long parameters[10];    
        
        DEBUG_PRINT("[+] Injecting process: %d
    ", target_pid);    
        
        if (ptrace_attach(target_pid) == -1)    
            goto exit;    
        
        if (ptrace_getregs(target_pid, &regs) == -1)    
            goto exit;    
        
        /* save original registers */    
        memcpy(&original_regs, &regs, sizeof(regs));    
        
        mmap_addr = get_remote_addr(target_pid, libc_path, (void *)mmap);    
        DEBUG_PRINT("[+] Remote mmap address: %x
    ", mmap_addr);    
        
        /* call mmap */    
        parameters[0] = 0;  // addr    
        parameters[1] = 0x4000; // size    
        parameters[2] = PROT_READ | PROT_WRITE | PROT_EXEC;  // prot    
        parameters[3] =  MAP_ANONYMOUS | MAP_PRIVATE; // flags    
        parameters[4] = 0; //fd    
        parameters[5] = 0; //offset    
        
        if (ptrace_call_wrapper(target_pid, "mmap", mmap_addr, parameters, 6, &regs) == -1)    
            goto exit;    
        
        map_base = ptrace_retval(&regs);    
        
        dlopen_addr = get_remote_addr( target_pid, linker_path, (void *)dlopen );    
        dlsym_addr = get_remote_addr( target_pid, linker_path, (void *)dlsym );    
        dlclose_addr = get_remote_addr( target_pid, linker_path, (void *)dlclose );    
        dlerror_addr = get_remote_addr( target_pid, linker_path, (void *)dlerror );    
        
        DEBUG_PRINT("[+] Get imports: dlopen: %x, dlsym: %x, dlclose: %x, dlerror: %x
    ",    
                dlopen_addr, dlsym_addr, dlclose_addr, dlerror_addr);    
        
        printf("library path = %s
    ", library_path);    
        ptrace_writedata(target_pid, map_base, library_path, strlen(library_path) + 1);    
        
        parameters[0] = map_base;       
        parameters[1] = RTLD_NOW| RTLD_GLOBAL;     
        
        if (ptrace_call_wrapper(target_pid, "dlopen", dlopen_addr, parameters, 2, &regs) == -1)    
            goto exit;    
        
        void * sohandle = ptrace_retval(&regs);    
        
    #define FUNCTION_NAME_ADDR_OFFSET       0x100    
        ptrace_writedata(target_pid, map_base + FUNCTION_NAME_ADDR_OFFSET, function_name, strlen(function_name) + 1);    
        parameters[0] = sohandle;       
        parameters[1] = map_base + FUNCTION_NAME_ADDR_OFFSET;     
        
        if (ptrace_call_wrapper(target_pid, "dlsym", dlsym_addr, parameters, 2, &regs) == -1)    
            goto exit;    
        
        void * hook_entry_addr = ptrace_retval(&regs);    
        DEBUG_PRINT("hook_entry_addr = %p
    ", hook_entry_addr);    
        
    #define FUNCTION_PARAM_ADDR_OFFSET      0x200    
        ptrace_writedata(target_pid, map_base + FUNCTION_PARAM_ADDR_OFFSET, param, strlen(param) + 1);    
        parameters[0] = map_base + FUNCTION_PARAM_ADDR_OFFSET;      
      
        if (ptrace_call_wrapper(target_pid, "hook_entry", hook_entry_addr, parameters, 1, &regs) == -1)    
            goto exit;        
        
        printf("Press enter to dlclose and detach
    ");    
        getchar();    
        parameters[0] = sohandle;       
        
        if (ptrace_call_wrapper(target_pid, "dlclose", dlclose, parameters, 1, &regs) == -1)    
            goto exit;    
        
        /* restore */    
        ptrace_setregs(target_pid, &original_regs);    
        ptrace_detach(target_pid);    
        ret = 0;    
        
    exit:    
        return ret;    
    }    
        
    int main(int argc, char** argv) {    
        pid_t target_pid;    
        target_pid = find_pid_of("/system/bin/surfaceflinger");    
        if (-1 == target_pid) {  
            printf("Can't find the process
    ");  
            return -1;  
        }  
        //target_pid = find_pid_of("/data/test");    
        inject_remote_process(target_pid, "/data/libhello.so", "hook_entry",  "I'm parameter!", strlen("I'm parameter!"));    
        return 0;  
    } 

    注意上面的/system/bin/surfaceflinger进程我随手写的,你的设备上不一定有。没有的话挑其它的也行,前提是ps命令里能找到。


    Android.mk:

    LOCAL_PATH := $(call my-dir)  
    include $(CLEAR_VARS)  
    LOCAL_MODULE := inject   
    LOCAL_SRC_FILES := inject.c   
    #shellcode.s   
    LOCAL_LDLIBS += -L$(SYSROOT)/usr/lib -llog   
    #LOCAL_FORCE_STATIC_EXECUTABLE := true  
    include $(BUILD_EXECUTABLE)  

    Application.mk:
    APP_ABI := x86 armeabi-v7a  

    运行nkd-build编译成生x86和arm平台下的可执行文件:


    再来生成要注入的so,创建目录及文件:
    jni
        suf.c
        Android.mk

        Application.mk


    suf.c:

    #include <unistd.h>  
    #include <stdio.h>  
    #include <stdlib.h>  
    #include <android/log.h>  
    #include <elf.h>  
    #include <fcntl.h>  
      
    #define LOG_TAG "DEBUG"  
    #define LOGD(fmt, args...) __android_log_print(ANDROID_LOG_DEBUG, LOG_TAG, fmt, ##args)    
      
    int hook_entry(char * a){  
        LOGD("Hook success, pid = %d
    ", getpid());  
        LOGD("Hello %s
    ", a);  
        return 0;  
    }  

    Android.mk:
    LOCAL_PATH := $(call my-dir)  
    include $(CLEAR_VARS)  
    LOCAL_LDLIBS += -L$(SYSROOT)/usr/lib -llog   
    #LOCAL_ARM_MODE := arm  
    LOCAL_MODULE    := suf  
    LOCAL_SRC_FILES := suf.c  
    include $(BUILD_SHARED_LIBRARY)  

    Application.mk:
    APP_ABI := x86 armeabi-v7a  

    运行nkd-build编译成生x86和arm平台下的so:


    然后就可以跑起来试试了,连接root过的Android设备或者打开模拟器。将inject和libhello.so拷入设备,设执行权限,执行:
    先看看被注入进程(surfaceflinger)的mmap,可以看到我们的so已经被加载了,紧接着的那一块就是我们mmap出来的:

    从logcat中也可以看到so注入成功,并且以被注入进程的身份执行了so中的代码.



    将编译好的文件拷贝到设备的data目录(这里不一定要拷贝到data目录下面,这个可以看自己的需要了)下面:

    adb push inject /data/

    adb push libsuf.so /data/

    然后修改一下文件的权限

    chmod 777 inject

    然后运行inject,同时我们可以查询一下/system/bin/surfaceflinger进程信息,可以看到,我们将libsuf.so注入到了此进程中.



    简单的注入成功,现在我们再来做一个实验,就是应用这套机制来截获surfaceflinger中的eglSwapBuffers调用,然后用我们自己的函数来替换掉原来的eglSwapBuffers调用。关于截系统中的函数调用网上有例子,这里依葫芦画瓢。首先将suf.c改下:

    #include <unistd.h>  
    #include <stdio.h>  
    #include <stdlib.h>  
    #include <android/log.h>  
    #include <EGL/egl.h>  
    #include <GLES/gl.h>  
    #include <elf.h>  
    #include <fcntl.h>  
    #include <sys/mman.h>  
      
    #define LOG_TAG "DEBUG"  
    #define LOGD(fmt, args...) __android_log_print(ANDROID_LOG_DEBUG, LOG_TAG, fmt, ##args)    
      
    EGLBoolean (*old_eglSwapBuffers)(EGLDisplay dpy, EGLSurface surf) = -1;  
      
    EGLBoolean new_eglSwapBuffers(EGLDisplay dpy, EGLSurface surface)  
    {  
        LOGD("New eglSwapBuffers
    ");  
        if (old_eglSwapBuffers == -1)  
            LOGD("error
    ");  
        return old_eglSwapBuffers(dpy, surface);  
    }  
      
    void* get_module_base(pid_t pid, const char* module_name)  
    {  
        FILE *fp;  
        long addr = 0;  
        char *pch;  
        char filename[32];  
        char line[1024];  
      
        if (pid < 0) {  
            /* self process */  
            snprintf(filename, sizeof(filename), "/proc/self/maps", pid);  
        } else {  
            snprintf(filename, sizeof(filename), "/proc/%d/maps", pid);  
        }  
      
        fp = fopen(filename, "r");  
      
        if (fp != NULL) {  
            while (fgets(line, sizeof(line), fp)) {  
                if (strstr(line, module_name)) {  
                    pch = strtok( line, "-" );  
                    addr = strtoul( pch, NULL, 16 );  
      
                    if (addr == 0x8000)  
                        addr = 0;  
      
                    break;  
                }  
            }  
      
            fclose(fp) ;  
        }  
      
        return (void *)addr;  
    }  
      
    #define LIBSF_PATH  "/system/lib/libsurfaceflinger.so"    
    int hook_eglSwapBuffers()    
    {    
        old_eglSwapBuffers = eglSwapBuffers;    
        LOGD("Orig eglSwapBuffers = %p
    ", old_eglSwapBuffers);    
        void * base_addr = get_module_base(getpid(), LIBSF_PATH);    
        LOGD("libsurfaceflinger.so address = %p
    ", base_addr);    
      
        int fd;    
        fd = open(LIBSF_PATH, O_RDONLY);    
        if (-1 == fd) {    
            LOGD("error
    ");    
            return -1;    
        }    
      
        Elf32_Ehdr ehdr;    
        read(fd, &ehdr, sizeof(Elf32_Ehdr));    
      
        unsigned long shdr_addr = ehdr.e_shoff;      
        int shnum = ehdr.e_shnum;      
        int shent_size = ehdr.e_shentsize;      
        unsigned long stridx = ehdr.e_shstrndx;      
      
        Elf32_Shdr shdr;    
        lseek(fd, shdr_addr + stridx * shent_size, SEEK_SET);      
        read(fd, &shdr, shent_size);      
      
        char * string_table = (char *)malloc(shdr.sh_size);      
        lseek(fd, shdr.sh_offset, SEEK_SET);      
        read(fd, string_table, shdr.sh_size);    
        lseek(fd, shdr_addr, SEEK_SET);      
      
        int i;      
        uint32_t out_addr = 0;    
        uint32_t out_size = 0;    
        uint32_t got_item = 0;  
        int32_t got_found = 0;    
      
        for (i = 0; i < shnum; i++) {      
            read(fd, &shdr, shent_size);      
            if (shdr.sh_type == SHT_PROGBITS) {    
                int name_idx = shdr.sh_name;      
                if (strcmp(&(string_table[name_idx]), ".got.plt") == 0   
                        || strcmp(&(string_table[name_idx]), ".got") == 0) {      
                    out_addr = base_addr + shdr.sh_addr;      
                    out_size = shdr.sh_size;      
                    LOGD("out_addr = %lx, out_size = %lx
    ", out_addr, out_size);    
      
                    for (i = 0; i < out_size; i += 4) {      
                        got_item = *(uint32_t *)(out_addr + i);    
                        if (got_item  == old_eglSwapBuffers) {      
                            LOGD("Found eglSwapBuffers in got
    ");    
                            got_found = 1;  
      
                            uint32_t page_size = getpagesize();  
                            uint32_t entry_page_start = (out_addr + i) & (~(page_size - 1));  
                            mprotect((uint32_t *)entry_page_start, page_size, PROT_READ | PROT_WRITE);  
                            *(uint32_t *)(out_addr + i) = new_eglSwapBuffers;    
      
                            break;      
                        } else if (got_item == new_eglSwapBuffers) {      
                            LOGD("Already hooked
    ");    
                            break;      
                        }      
                    }     
                    if (got_found)   
                        break;  
                }     
            }      
        }      
      
        free(string_table);      
        close(fd);    
    }    
      
    int hook_entry(char * a){  
        LOGD("Hook success
    ");  
        LOGD("Start hooking
    ");  
        hook_eglSwapBuffers();    
        return 0;  
    }  

    其实这种查找方法有点简单粗暴,要是正式应用的话可以在动态符号表中查找这个符号的got地址。
    接着Android.mk改为:

    LOCAL_PATH := $(call my-dir)  
    include $(CLEAR_VARS)  
    LOCAL_LDLIBS += -L$(SYSROOT)/usr/lib -llog -lEGL  
    #LOCAL_ARM_MODE := arm  
    LOCAL_MODULE    := hello  
    LOCAL_SRC_FILES := hello.c  
    include $(BUILD_SHARED_LIBRARY) 

    Application.mk :

    APP_ABI := x86 armeabi-v7a    
    APP_PLATFORM := android-14  

    运行ndk-build编译
    和上面一样运行,查看logcat,我们可以看到surfaceflinger中调用eglSwapBuffers的地址已被替换成我们的版本:
    D/INJECT  ( 2231): [+] Injecting process: 1728  
    D/INJECT  ( 2231): [+] get_remote_addr: local[b7e4f000], remote[b7e73000]  
    D/INJECT  ( 2231): [+] Remote mmap address: b7e9fe32  
    D/INJECT  ( 2231): [+] Calling mmap in target process.  
    D/INJECT  ( 2231): [+] Target process returned from mmap, return value=b4f1c000, pc=0   
    D/INJECT  ( 2231): [+] get_remote_addr: local[b7f00000], remote[b7f7e000]  
    D/INJECT  ( 2231): [+] get_remote_addr: local[b7f00000], remote[b7f7e000]  
    D/INJECT  ( 2231): [+] get_remote_addr: local[b7f00000], remote[b7f7e000]  
    D/INJECT  ( 2231): [+] get_remote_addr: local[b7f00000], remote[b7f7e000]  
    D/INJECT  ( 2231): [+] Get imports: dlopen: b7f84f50, dlsym: b7f84fd0, dlclose: b7f84de0, dlerror: b7f84dc0  
    D/INJECT  ( 2231): [+] Calling dlopen in target process.  
    D/INJECT  ( 2231): [+] Target process returned from dlopen, return value=b7f995ec, pc=0   
    D/INJECT  ( 2231): [+] Calling dlsym in target process.  
    D/INJECT  ( 2231): [+] Target process returned from dlsym, return value=b4f17e10, pc=0   
    D/INJECT  ( 2231): hook_entry_addr = 0xb4f17e10  
    D/DEBUG   ( 1728): Hook success  
    D/DEBUG   ( 1728): Start hooking  
    D/DEBUG   ( 1728): Orig eglSwapBuffers = 0xb7d4a9c0  
    D/DEBUG   ( 1728): libsurfaceflinger.so address = 0xb7f22000  
    D/DEBUG   ( 1728): out_addr = b7f7aff4, out_size = 624  
    D/DEBUG   ( 1728): Found eglSwapBuffers in got  
    ...  
    D/DEBUG   ( 1728): New eglSwapBuffers  
    D/DEBUG   ( 1728): New eglSwapBuffers  
    D/DEBUG   ( 1728): New eglSwapBuffers  

    ...  


    Demo下载地址:http://download.csdn.net/detail/jiangwei0910410003/7926427


    这篇文章就简单介绍了如何将对surfaceflinger进程进行注入和拦截的操作。这个还是很有用的,后续我们还会对system_process进程进行注入和拦截,那时候还会参考这篇文章。。


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  • 原文地址:https://www.cnblogs.com/roccheung/p/5797328.html
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