1 // Copyright (c) 2013 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
main()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