third_party/android_crazy_linker/src/tests/test_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 // A crazy linker test to:
   6 // - Load a library (libfoo.so) with the linker.
   7 // - Find the address of the "Foo" function in it.
   8 // - Call the function.
   9 // - Close the library.
  10
  11 #include <errno.h>
  12 #include <stdarg.h>
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <sys/socket.h>
  16 #include <sys/uio.h>
  17 #include <sys/wait.h>
  18 #include <unistd.h>
  19
  20 #include <crazy_linker.h>
  21
  22 #include "test_util.h"
  23
  24 typedef void (*FunctionPtr)();
  25
  26 int main() {
  27   crazy_context_t* context = crazy_context_create();
  28
  29   RelroLibrary foo;
  30
  31   // Load at fixed address to simplify testing.
  32   crazy_context_set_load_address(context, 0x20000000);
  33   foo.Init("libfoo_with_relro.so", context);
  34
  35   printf("Library loaded\n");
  36
  37   int pipes[2];
  38   if (socketpair(AF_UNIX, SOCK_STREAM, 0, pipes) < 0)
  39     Panic("Could not create socket pair: %s", strerror(errno));
  40
  41   pid_t child = fork();
  42   if (child < 0)
  43     Panic("Could not fork test program!");
  44
  45   if (child == 0) {
  46     // In the child.
  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     printf("Parent enabling foo RELRO sharing\n");
  72
  73     foo.EnableSharedRelro(context);
  74     foo.SendRelroInfo(pipes[1]);
  75
  76     printf("RELRO enabled and sent to child\n");
  77
  78     CheckRelroMaps(1);
  79
  80     printf("Parent waiting for child\n");
  81
  82     // Wait for child to complete.
  83     int status;
  84     waitpid(child, &status, 0);
  85
  86     if (WIFSIGNALED(status))
  87       Panic("Child terminated by signal!!\n");
  88     else if (WIFEXITED(status)) {
  89       int child_status = WEXITSTATUS(status);
  90       if (child_status != 0)
  91         Panic("Child terminated with status=%d\n", child_status);
  92     } else
  93       Panic("Child exited for unknown reason!!\n");
  94   }
  95
  96   crazy_context_destroy(context);
  97   return 0;
  98 }