PSB + FUP decoder errors

Open ezhes opened this issue 5 years ago • 2 comments

When do we actually use the IP provided by an FUP in a PSB? It seems like we have decoding issues when the tracing is enabled while the process is running (so no PGE.TIP)

Jan 08 '21 23:01 ezhes

We hit this occasionally while fuzzing. It's fairly rare (in terms of iterations) but it does happen a few times.

slide = 0x7ffff7f3a000

a.zip

Jan 13 '21 11:01 ezhes

It seems from that trace that PSB FUP IP values can be at least used to fill LastIP field which is zeroed by PSB. Looks like this is already implemented, what problems do you have with PSB FUPs?

Mar 22 '21 13:03 vient