Re: [PATCH] x86_64: another fix for canonical RIPs during signal handling

[Andi Kleen]

> 
> that's not true. if the application expects to crash due to a bad
> signal handler then rip=0 may or may not achieve that, depending on
> what mapping exists at that address - this is inconsistent behaviour
> (from userland's point of view) created by the kernel itself, hence
> this is a kernel bug and should be fixed.

If it "wants" to crash it can just jump to 0 (or whatever unmapped address
it has) by itself. No need to involve the kernel here.

The only point of the patch was to not make the kernel/CPU crash due 
to CPU bugs triggered by applications. But we really
don't care what happens to the application when it corrupts its stack frame.

-Andi
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