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/*
* Copyright (c) 2014 HockeyApp, Bit Stadium GmbH.
* All rights reserved.
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#import "CRLCrashCorruptObjC.h"
#import <dlfcn.h>
#import <objc/message.h>
#import <mach-o/loader.h>
#import <mach-o/nlist.h>
@implementation CRLCrashCorruptObjC
- (NSString *)category { return @"Various"; }
- (NSString *)title { return @"Corrupt the Objective-C runtime's structures"; }
- (NSString *)desc { return @""
"Write garbage into data areas used by the Objective-C runtime to track classes and objects. "
"Bugs of this nature are why crash reporters cannot use Objective-C in their crash handling code, "
"as attempting to do so is likely to lead to a crash in the crash reporting code.";
}
- (void)crash
{
Class objClass = [NSObject class];
// VERY VERY PRIVATE INTERNAL RUNTIME DETAILS VERY VERY EVIL THIS IS BAD!!!
struct objc_cache_t {
uintptr_t mask; /* total = mask + 1 */
uintptr_t occupied;
void *buckets[1];
};
struct objc_class_t {
struct objc_class_t *isa;
struct objc_class_t *superclass;
struct objc_cache_t cache;
IMP *vtable;
uintptr_t data_NEVER_USE; // class_rw_t * plus custom rr/alloc flags
};
#if __i386__ && !TARGET_IPHONE_SIMULATOR
#define __bridge
#endif
struct objc_class_t *objClassInternal = (__bridge struct objc_class_t *)objClass;
// Trashes NSObject's method cache
memset(&objClassInternal->cache, 0xa5, sizeof(struct objc_cache_t));
[self description];
}
@end