1// Copyright 2014 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include <errno.h>
6#include <stdarg.h>
7#include <stdio.h>
8#include <stdlib.h>
9#include <sys/socket.h>
10#include <sys/uio.h>
11#include <sys/wait.h>
12#include <unistd.h>
13
14#include <crazy_linker.h>
15
16#include "test_util.h"
17
18#define PARENT_ADDRESS 0x20000000
19#define CHILD_ADDRESS 0x20134000
20
21typedef void (*FunctionPtr)();
22
23int main() {
24
25  if (!crazy_system_can_share_relro()) {
26    fprintf(stderr, "WARNING: Test ignored due to broken kernel!!\n");
27    return 0;
28  }
29
30  crazy_context_t* context = crazy_context_create();
31
32  RelroLibrary foo;
33
34  int pipes[2];
35  if (socketpair(AF_UNIX, SOCK_STREAM, 0, pipes) < 0)
36    Panic("Could not create socket pair: %s", strerror(errno));
37
38  pid_t child = fork();
39  if (child < 0)
40    Panic("Could not fork test program!");
41
42  if (child == 0) {
43    // In the child.
44    crazy_context_set_load_address(context, CHILD_ADDRESS);
45    foo.Init("libfoo_with_relro.so", context);
46
47    printf("Child waiting for foo relro fd\n");
48
49    foo.ReceiveRelroInfo(pipes[0]);
50    foo.UseSharedRelro(context);
51
52    printf("RELRO used in child process\n");
53
54    CheckRelroMaps(1);
55
56    FunctionPtr foo_func;
57    if (!crazy_library_find_symbol(
58             foo.library, "Foo", reinterpret_cast<void**>(&foo_func)))
59      Panic("Could not find 'Foo' in library");
60
61    printf("Calling Foo()\n");
62    (*foo_func)();
63
64    printf("Foo called, exiting\n");
65
66    exit(0);
67
68  } else {
69    // In the parent.
70
71    // Load at fixed address to simplify testing.
72    crazy_context_set_load_address(context, PARENT_ADDRESS);
73    foo.Init("libfoo_with_relro.so", context);
74
75    printf("Library loaded\n");
76
77    printf("Parent enabling foo RELRO sharing\n");
78
79    foo.CreateSharedRelro(context, CHILD_ADDRESS);
80    foo.SendRelroInfo(pipes[1]);
81
82    printf("Relocated RELRO sent to child\n");
83
84    CheckRelroMaps(0);
85
86    printf("Parent waiting for child\n");
87
88    // Wait for child to complete.
89    int status;
90    waitpid(child, &status, 0);
91
92    if (WIFSIGNALED(status))
93      Panic("Child terminated by signal!!\n");
94    else if (WIFEXITED(status)) {
95      int child_status = WEXITSTATUS(status);
96      if (child_status != 0)
97        Panic("Child terminated with status=%d\n", child_status);
98    } else
99      Panic("Child exited for unknown reason!!\n");
100  }
101
102  crazy_context_destroy(context);
103  return 0;
104}
105