patrickl@xxxxxxxxx said:
> I think UML is good, but how can I technically prove this point to my
> managers (they want some "proofs")?
You can't. There is possibly a sequence of normal unprivileged instructions
which can crash the CPU. If an app were to execute this sequence, the machine
crashes, whether the app is inside a UML or not.
What UML does is change the nature of the interaction of the app and host
kernel. Running on the host, an app can execute any of ~250 system calls.
Running inside UML, it ends up making maybe 20-30 different system calls.
This reduces the host kernel code that's executed, making an argument that
UML is protective of the host.
On the other hand, those 20-30 system calls are very intensively used, and
this increases the possibility of exercising race conditions and the like.
Jeff
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