test/fakeRealizedClass2.m

   1 /*
   2 Variant on fakeRealizedClass which tests a fake class with no superclass rdar://problem/67692760
   3 TEST_CONFIG OS=macosx
   4 TEST_CRASHES
   5 TEST_RUN_OUTPUT
   6 objc\[\d+\]: realized class 0x[0-9a-fA-F]+ has corrupt data pointer 0x[0-9a-fA-F]+
   7 objc\[\d+\]: HALTED
   8 END
   9 */
  10
  11 #include "test.h"
  12
  13 #include <objc/NSObject.h>
  14
  15 #define RW_REALIZED (1U<<31)
  16
  17 struct ObjCClass {
  18     struct ObjCClass * __ptrauth_objc_isa_pointer isa;
  19     struct ObjCClass * __ptrauth_objc_super_pointer superclass;
  20     void *cachePtr;
  21     uintptr_t zero;
  22     uintptr_t data;
  23 };
  24
  25 struct ObjCClass_ro {
  26     uint32_t flags;
  27     uint32_t instanceStart;
  28     uint32_t instanceSize;
  29 #ifdef __LP64__
  30     uint32_t reserved;
  31 #endif
  32
  33     union {
  34         const uint8_t * ivarLayout;
  35         struct ObjCClass * nonMetaClass;
  36     };
  37
  38     const char * name;
  39     struct ObjCMethodList * __ptrauth_objc_method_list_pointer baseMethodList;
  40     struct protocol_list_t * baseProtocols;
  41     const struct ivar_list_t * ivars;
  42
  43     const uint8_t * weakIvarLayout;
  44     struct property_list_t *baseProperties;
  45 };
  46
  47 extern struct ObjCClass OBJC_METACLASS_$_NSObject;
  48 extern struct ObjCClass OBJC_CLASS_$_NSObject;
  49
  50 struct ObjCClass_ro FakeSuperclassRO = {
  51     .flags = RW_REALIZED
  52 };
  53
  54 struct ObjCClass FakeSuperclass = {
  55     &OBJC_METACLASS_$_NSObject,
  56     NULL,
  57     NULL,
  58     0,
  59     (uintptr_t)&FakeSuperclassRO
  60 };
  61
  62 struct ObjCClass_ro FakeSubclassRO;
  63
  64 struct ObjCClass FakeSubclass = {
  65   &FakeSuperclass,
  66   &FakeSuperclass,
  67   NULL,
  68   0,
  69   (uintptr_t)&FakeSubclassRO
  70 };
  71
  72 static struct ObjCClass *class_ptr __attribute__((used)) __attribute((section("__DATA,__objc_nlclslist"))) = &FakeSubclass;
  73
  74 int main() {}