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fi01/ptrace_test.c

Created November 16, 2013 14:54
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  1. fi01 created this gist Nov 16, 2013.
    67 changes: 67 additions & 0 deletions ptrace_test.c
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    /*
    * Copyright (C) 2013 The Android Open Source Project
    *
    * Licensed under the Apache License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    * http://www.apache.org/licenses/LICENSE-2.0
    *
    * Unless required by applicable law or agreed to in writing, software
    * distributed under the License is distributed on an "AS IS" BASIS,
    * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    * See the License for the specific language governing permissions and
    * limitations under the License.
    */

    #include <unistd.h>
    #include <sys/syscall.h>
    #include <sys/ptrace.h>
    #include <sys/wait.h>
    #include <signal.h>
    #include <stdio.h>
    #include <stdlib.h>
    #include <stdbool.h>
    #include <stdint.h>

    int main(void)
    {
    static const char *uevent_helper_data = "test_data";
    unsigned long *uevent_helper_addr = (void *)0xc1032c70;
    static bool child_started = false;
    int i;
    long ret;

    pid_t child_pid = fork();
    if (child_pid == -1) {
    return 1;
    }

    if (child_pid == 0) {
    ret = ptrace(PTRACE_TRACEME, 0, 0, 0);
    if (ret != 0) {
    fprintf(stderr, "child ptrace failed\n");
    }

    child_started = true;

    signal(SIGSTOP, SIG_IGN);
    kill(getpid(), SIGSTOP);

    exit(0);
    }

    do {
    ret = syscall(__NR_ptrace, PTRACE_PEEKDATA, child_pid, &child_started, &child_started);
    } while (!child_started);

    for (i = 0; i < strlen(uevent_helper_data) + 1 + 4; i += 4) {
    ret = syscall(__NR_ptrace, PTRACE_PEEKDATA, child_pid, uevent_helper_data + i, uevent_helper_addr + i / 4);
    if (ret != 0) {
    printf("ptrace(): failed\n");
    break;
    }
    }

    return 0;
    }