unit-tests/test-cases/trie-symbol-overrun/main.c

   1 /*
   2  * Copyright (c) 2009 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 #include <stdio.h>  // fprintf(), NULL
  24 #include <stdlib.h> // exit(), EXIT_SUCCESS
  25 #include <mach-o/dyld.h>
  26 #include <mach/mach.h>
  27 #include <sys/mman.h>
  28 #include <dlfcn.h>
  29 #include <Availability.h>
  30
  31
  32 #include "test.h" // PASS(), FAIL(), XPASS(), XFAIL()
  33
  34
  35
  36 int main()
  37 {
  38         // allocate two pages
  39         vm_address_t addr = 0;
  40         kern_return_t r = vm_allocate(mach_task_self(), &addr, 8192, VM_FLAGS_ANYWHERE);
  41         if ( r != KERN_SUCCESS )  {
  42                 FAIL("vm_allocate returned %d", r);
  43                 exit(0);
  44         }
  45         // mark the second page unreadable
  46         mprotect((char*)(addr+4096), 4096, 0);
  47         // copy a string to the end of the first page
  48         char* sym = (char*)(addr+4096-5);
  49         strcpy(sym, "_abd");
  50
  51         // call a dyld API that uses the string
  52         // if dyld reads past the end of the string, it will crash
  53         // <rdar://problem/6493245> trie parser can read past end of input symbol name
  54 #if defined(__MAC_OS_X_VERSION_MIN_REQUIRED) && (__MAC_OS_X_VERSION_MIN_REQUIRED <= __MAC_10_5)
  55         _dyld_lookup_and_bind(sym, NULL, NULL);
  56 #else
  57         dlsym(RTLD_DEFAULT, sym);
  58 #endif
  59         PASS("trie-symbol-overrun");
  60         return EXIT_SUCCESS;
  61 }