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 Forums >>  Debuggers  >>  Noob olly question

Topic created on: October 13, 2006 17:08 CDT by tehryan .

I'm pretty new to RE and i'm trying to get a handle on olly. I want to take a look at how the Math.random() javascript function works in firefox by making a call to it, and debugging firefox as it executes that call. My problem is getting olly to break at a pertinent time. Is there a way I can just get olly to watch for a particular value (like, 12345) and then throw that somewhere in my javascript so that when the javascript starts getting executed, Olly will break at least CLOSE to what I should be looking at ?

  sp     October 14, 2006 01:22.07 CDT
No need to debug anything here. FireFox is Open Source. You can grab the source code from here and check out mozilla/js/src/jsmath.c . The entire code is in that file.

If you still want to debug it in OllyDbg for whatever reason you could make a file like <scr1pt>alert(Math.random())</scr1pt> and try to break on the message box. Alternatively, since you know the code you're looking for from the C source, you could probably locate the relevant code in the binary using a small IDC script in IDA. Another option is to insert a __asm int 03 instruction into the source code and recompile it.

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