unit-tests/test-cases/read-only-stubs/main.c

   1 /*
   2  * Copyright (c) 2007 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 <unistd.h>
  26 #include <mach-o/getsect.h>
  27 #include <mach/mach.h>
  28 #include <mach/mach_vm.h>
  29 #include "test.h" // PASS(), FAIL(), XPASS(), XFAIL()
  30
  31
  32 extern void foo();
  33 extern int fooData;
  34
  35 static vm_prot_t getPermission(void* addr)
  36 {
  37     mach_vm_address_t                           address = (mach_vm_address_t)(uintptr_t)addr;
  38     kern_return_t                                       result;
  39     mach_port_t                                         object_name;
  40     vm_region_basic_info_data_64_t      info;
  41     mach_msg_type_number_t                      count;
  42     mach_vm_size_t                                      size = 4096;
  43
  44         count = VM_REGION_BASIC_INFO_COUNT_64;
  45         result = mach_vm_region(mach_task_self(),
  46                                         &address,
  47                                         &size,
  48                                         VM_REGION_BASIC_INFO_64,
  49                                         (vm_region_info_t)&info,
  50                                         &count,
  51                                         &object_name);
  52         //fprintf(stderr, "result=%X, info.protection=%X\n", result, info.protection);
  53         if ( result == KERN_SUCCESS )
  54                 return info.protection;
  55         return 0;
  56 }
  57
  58
  59 static void* getStubAddr()
  60 {
  61         unsigned long size;
  62 #if __i386__
  63         return getsectdata("__IMPORT", "__jump_table", &size);
  64 #elif __ppc__
  65         void* p = getsectdata("__TEXT", "__picsymbolstub1", &size);
  66         if ( p != NULL )
  67                 return p;
  68         return getsectdata("__TEXT", "__symbol_stub1", &size);
  69 #elif __ppc64__
  70         return getsectdata("__TEXT", "__picsymbolstub1", &size);
  71 #elif __x86_64__
  72         return getsectdata("__TEXT", "__symbol_stub1", &size);
  73 #else
  74         #error unknown arch
  75 #endif
  76 }
  77
  78
  79 static void checkStubs(void* addr)
  80 {
  81         vm_prot_t perm = getPermission(addr);
  82         if ( (perm == 0) || ((perm & VM_PROT_WRITE) != 0) ) {
  83                 FAIL("read-only-stubs: bad permissions %d at address %p", perm, addr);
  84                 exit(0);
  85         }
  86 }
  87
  88
  89 int main()
  90 {
  91         void* stubAddr = getStubAddr();
  92         checkStubs(stubAddr);
  93         fooData = 1;
  94         foo();
  95         checkStubs(stubAddr);
  96         PASS("read-only-stubs");
  97         return EXIT_SUCCESS;
  98 }
  99
 100