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FUN_00401000 entry point (main) FUN_00401200 parse_input FUN_00401430 execute FUN_00401780 op_add FUN_00401810 op_sub FUN_004018c0 op_load FUN_00401950 op_store FUN_00401b10 win int main(void) char buf[256]; read(0, buf, 256); parse_input(buf); execute(); puts("Failure!"); return 0;
The program reads a user‑supplied string (up to 256 bytes) from , parses it as a sequence of ISA‑mini instructions, executes them, and finally prints either Success! or Failure! .
Thus, if we can , the program will call win after finishing the instruction stream, and we win. 5. Vulnerability Discovery The ST instruction performs:
Putting it together (little‑endian encoding for the immediate):
FUN_00401000 entry point (main) FUN_00401200 parse_input FUN_00401430 execute FUN_00401780 op_add FUN_00401810 op_sub FUN_004018c0 op_load FUN_00401950 op_store FUN_00401b10 win int main(void) char buf[256]; read(0, buf, 256); parse_input(buf); execute(); puts("Failure!"); return 0;
The program reads a user‑supplied string (up to 256 bytes) from , parses it as a sequence of ISA‑mini instructions, executes them, and finally prints either Success! or Failure! .
Thus, if we can , the program will call win after finishing the instruction stream, and we win. 5. Vulnerability Discovery The ST instruction performs:
Putting it together (little‑endian encoding for the immediate):
