The indirect symbol table, which is located in the _LINKEDIT segment of the binary, is just an array of indexes into the symbol table (also in _LINKEDIT) whose order is identical to that of the pointers in the non-lazy and lazy symbol sections. For the two relevant sections, the section headers ( struct sections from ) provide an offset (in the reserved1 field) into what is known as the indirect symbol table. In order to find the name of the symbol that corresponds to a particular location in one of these sections, we have to jump through several layers of indirection. _nl_symbol_ptr is an array of pointers to non-lazily bound data (these are bound at the time a library is loaded) and _la_symbol_ptr is an array of pointers to imported functions that is generally filled by a routine called dyld_stub_binder during the first call to that symbol (it's also possible to tell dyld to bind these at launch). fishhook re-binds these symbols by determining the locations to update for each of the symbol names passed to rebind_symbols and then writing out the corresponding replacements.įor a given image, the _DATA segment may contain two sections that are relevant for dynamic symbol bindings: _nl_symbol_ptr and _la_symbol_ptr. Return UIApplicationMain(argc, argv, nil, NSStringFromClass()) Ĭalling real open('/var/mobile/Applications/161DA598-5B83-41F5-8A44-675491AF6A2C/Test.app/Test', 0)ĭyld binds lazy and non-lazy symbols by updating pointers in particular sections of the _DATA segment of a Mach-O binary. Printf( "Mach-O Magic Number: %x \n ", magic_number)
Open our own binary and print out first 4 bytes (which is the same // for all Mach-O binaries on a given architecture) int fd = open(argv, O_RDONLY)
Int my_open( const char *path, int oflag. Printf( "Calling real close( %d) \n ", fd)
Static int (*orig_open)( const char *, int. While you're in a bubble.) Perfect timing and puzzle solving skills are essential if you want to avoid the increasingly difficult obstacles and master all of the underwater moves you'll need to win.# import "fishhook.h " static int (*orig_close)( int) You will have to float, fall and fling yourself through the mazes to advance, all while maneuvering with the precision of a ninja (well, the fish version of a ninja. You assume the role of Milo and must master the art of making and popping bubbles to successfully navigate the treacherous waters of Randy's diabolical design. Fish Hooks is an underwater physics-based adventure puzzle starring Milo the fish and a host of his aquatic friends from Freshwater High.
0 kommentar(er)
