third_party/android_crazy_linker/src/tests/test_relocated_shared_relro.cpp

   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
  21 typedef void (*FunctionPtr)();
  22
  23 int 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 }