linux-firmware: Use-after-free in AMD Zen2 Processors about aosc-os-abbs

[MingcongBai]

It is recommended to try executing ./zenbleed -v2 or ./zenbleed -v3 as a means to verify the PoC - if you see any random strings being printed, that means the exploit is active.

[chenx97]

The official way of testing uses -s -H 0 to specify a hammer thread to produce a reliable stream of strings to be collected by another thread, and let the program print out such magic strings only. If you see something like "24TERCES@0" rolling out reliably then the exploit works on your machine.

[chenx97]

Before AMD the sloth turns its body around, we have to rely on the kernel setting the chicken bit for us.

[jiegec]

Updated