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      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 
     28   if (!crazy_system_can_share_relro()) {
     29     fprintf(stderr, "WARNING: Test ignored due to broken kernel!!\n");
     30     return 0;
     31   }
     32 
     33   crazy_context_t* context = crazy_context_create();
     34 
     35   RelroLibrary foo;
     36 
     37   // Load at fixed address to simplify testing.
     38   crazy_context_set_load_address(context, 0x20000000);
     39   foo.Init("libfoo_with_relro.so", context);
     40 
     41   printf("Library loaded\n");
     42 
     43   int pipes[2];
     44   if (socketpair(AF_UNIX, SOCK_STREAM, 0, pipes) < 0)
     45     Panic("Could not create socket pair: %s", strerror(errno));
     46 
     47   pid_t child = fork();
     48   if (child < 0)
     49     Panic("Could not fork test program!");
     50 
     51   if (child == 0) {
     52     // In the child.
     53     printf("Child waiting for foo relro fd\n");
     54 
     55     foo.ReceiveRelroInfo(pipes[0]);
     56     foo.UseSharedRelro(context);
     57 
     58     printf("RELRO used in child process\n");
     59 
     60     CheckRelroMaps(1);
     61 
     62     FunctionPtr foo_func;
     63     if (!crazy_library_find_symbol(
     64              foo.library, "Foo", reinterpret_cast<void**>(&foo_func)))
     65       Panic("Could not find 'Foo' in library");
     66 
     67     printf("Calling Foo()\n");
     68     (*foo_func)();
     69 
     70     printf("Foo called, exiting\n");
     71 
     72     exit(0);
     73 
     74   } else {
     75     // In the parent.
     76 
     77     printf("Parent enabling foo RELRO sharing\n");
     78 
     79     foo.EnableSharedRelro(context);
     80     foo.SendRelroInfo(pipes[1]);
     81 
     82     printf("RELRO enabled and sent to child\n");
     83 
     84     CheckRelroMaps(1);
     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