3 ms·

int noMain() __attribute__ (constructor); int noMain() { printf("Goodbye, main()"); } // &etc.

• dfox 9y ago
  This actually would not link, because _start() or something it calls into (depending on implementation of CRT on given platform) would contain unresolved reference to main. (and goven the fact that all this CRT startup code is usually one .o, you cannot just patch out the part that calls main(), you have to replace it completely) On the other hand something around the lines of: void _start(){ write(1, "Hello world\n", 12); exit(0); } should probably work, given that you link it without CRT startup code (ie. gcc -nostdlib)
  • im3w1l 9y ago
    Now for more confusion, have a main function that _start doesn't call. Now for even more confusion, have the main function (which never runs) call the _start function.
    • gumby 9y ago
      You are evil!
      • therein 9y ago
        He should be writing some crackmes.