Alexander Smirnov smirn0v

smirn0v / msg send nil self

Created April 30, 2013 20:30

ObjcMsgSend

	// message sent to nil: redirect to nil receiver, if any
	LMsgSendNilSelf:
	call 1f // load new receiver
	1: popl %edx
	movl __objc_nilReceiver-1b(%edx),%eax
	testl %eax, %eax // return nil if no new receiver
	je LMsgSendReturnZero
	movl %eax, self(%esp) // send to new receiver
	jmp LMsgSendReceiverOk // receiver must be in %eax

smirn0v / nil-receiver

Created April 30, 2013 20:38

alternative nil receiver

	#include <Foundation/Foundation.h>

	extern id _objc_setNilReceiver(id newNilReceiver);

	@interface Foo:NSObject{}
	@end
	@implementation Foo
	- (void) some {
	NSLog(@"Some");
	}

smirn0v / gist:5814474

Created June 19, 2013 13:50

inseatd of sed

perl -pe "s/some/some2/g"

smirn0v / gist:5845786

Created June 23, 2013 17:24

Demangle

	$ c++filt __ZNKSs16find_last_not_ofEcm
	std::string::find_last_not_of(char, unsigned long) const

smirn0v / gist:5896401

Created June 30, 2013 18:59

	def a(addr):
	... print "0x%x"%(addr-0x1000+0x51000)

smirn0v / gist:6000265

Created July 15, 2013 14:16

download ssl cert

echo "HEAD / HTTP/1.0\n Host: example.com:443\n\n EOT\n" | openssl s_client -prexit -connect example.com:443

smirn0v / gist:6122949

Created July 31, 2013 15:23

clang build test from console

clang -framework Foundation -fobjc-arc test.m

smirn0v / gist:6146374

Created August 3, 2013 13:03

sudo /usr/sbin/DevToolsSecurity --enable

smirn0v / gist:6172658

Created August 7, 2013 09:42

Alternate xcodebuild

	export DEVELOPER_DIR="/Users/johann/XcodesFolder/Xcode_4_6_3/Xcode.app/Contents/Developer";

smirn0v / gist:6425865

Last active December 23, 2015 10:44

Resign

	1. extract old entitlements

	codesign -d --entitlements :entitlements.plist Payload/PathToApp.app/

	2. fix entitlements, or just copy from provisioning profile
	3. copy new provprofile to Payload/PathToApp.app/embedded.mobileprovision
	4. fix bundle id in info.plist
	4.1 /usr/libexec/PlistBuddy Info.plist
	4.2 set CFBundleIdentifier new.app.bundle.id.with.no.team.id
	4.3 save