Making time(0) produce an error

Asked Sep 17 '22 at 22:09

Active Sep 17 '22 at 22:10

Viewed 34 times

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.

edited Sep 17 '22 at 22:10

asked Sep 17 '22 at 22:09

531-M31C

You could write your own implementation of `time`, compile it into a library and use `LD_PRELOAD` to load it and use it instead of the original implementation. – Steffen Ullrich Sep 18 '22 at 05:19
Example: https://github.com/zardus/preeny/blob/master/src/detime.c – multithr3at3d Sep 18 '22 at 22:42

Making time(0) produce an error

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