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I'm currently reviewing/reversing a software (coded in C) and it has a line like this :

time_t var = time(0);

My goal it to get this time(0) call to return -1. (I cannot modify the parameter.)

Looking for any hints/POC methods to achieve this, with a high preference for solutions which do not require root perms. But I'd be happy to hear root solutions as well. So far I've tried to modify the system's clock, but I can't manage to set it to a value that would make time fail. (Btw hardware manipulation solutions are also welcomed)

Context :

  • System environment : Ubuntu 18.04.1 64-bit.
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