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 <Availability.h>
  27 #include <mach-o/getsect.h>
  28 #include <mach/mach.h>
  29 #include <mach/mach_vm.h>
  30 #include "test.h" // PASS(), FAIL(), XPASS(), XFAIL()
  31
  32 #if __MAC_OS_X_VERSION_MIN_REQUIRED
  33
  34 extern void foo();
  35 extern int fooData;
  36
  37 static vm_prot_t getPermission(void* addr)
  38 {
  39     mach_vm_address_t                           address = (mach_vm_address_t)(uintptr_t)addr;
  40     kern_return_t                                       result;
  41     mach_port_t                                         object_name;
  42     vm_region_basic_info_data_64_t      info;
  43     mach_msg_type_number_t                      count;
  44     mach_vm_size_t                                      size = 4096;
  45
  46         count = VM_REGION_BASIC_INFO_COUNT_64;
  47         result = mach_vm_region(mach_task_self(),
  48                                         &address,
  49                                         &size,
  50                                         VM_REGION_BASIC_INFO_64,
  51                                         (vm_region_info_t)&info,
  52                                         &count,
  53                                         &object_name);
  54         //fprintf(stderr, "result=%X, info.protection=%X\n", result, info.protection);
  55         if ( result == KERN_SUCCESS )
  56                 return info.protection;
  57         return 0;
  58 }
  59
  60
  61 static void* getStubAddr()
  62 {
  63         unsigned long size;
  64 #if __i386__
  65         return getsectdata("__IMPORT", "__jump_table", &size);
  66 #elif __ppc__
  67         void* p = getsectdata("__TEXT", "__picsymbolstub1", &size);
  68         if ( p != NULL )
  69                 return p;
  70         return getsectdata("__TEXT", "__symbol_stub1", &size);
  71 #elif __ppc64__
  72         return getsectdata("__TEXT", "__picsymbolstub1", &size);
  73 #elif __x86_64__
  74         return getsectdata("__TEXT", "__symbol_stub1", &size);
  75 #elif __arm__
  76         void* p = getsectdata("__TEXT", "__symbol_stub4", &size);
  77         if ( p != NULL )
  78                 return p;
  79         return getsectdata("__TEXT", "__symbolstub1", &size);
  80 #else
  81         #error unknown arch
  82 #endif
  83 }
  84
  85
  86 static void checkStubs(void* addr)
  87 {
  88         vm_prot_t perm = getPermission(addr);
  89         if ( (perm == 0) || ((perm & VM_PROT_WRITE) != 0) ) {
  90                 FAIL("read-only-stubs: bad permissions %d at address %p", perm, addr);
  91                 exit(0);
  92         }
  93 }
  94
  95
  96 int main()
  97 {
  98         void* stubAddr = getStubAddr();
  99 #if __i386__
 100         if ( stubAddr != NULL )
 101 #endif
 102         {
 103         checkStubs(stubAddr);
 104         fooData = 1;
 105         foo();
 106         checkStubs(stubAddr);
 107         }
 108         PASS("read-only-stubs");
 109         return EXIT_SUCCESS;
 110 }
 111
 112 #else
 113
 114 int main()
 115 {
 116         // iOS does not have modifiable stubs
 117         PASS("read-only-stubs");
 118         return EXIT_SUCCESS;
 119 }
 120
 121 #endif
 122