On Thu, 2006-08-10 at 13:52 +0200, Andi Kleen wrote:
> On Thursday 10 August 2006 13:36, Fernando Luis Vázquez Cao wrote:
> > A kprobe executes IRET early and that could cause NMI recursion and stack
> > corruption.
> >
> > Note: This problem was originally spotted and solved by Andi Kleen in the
> > x86_64 architecture. This patch is an adaption of his patch for i386.
>
> Originally Jan Beulich discovered these classes of bugs actually
Sorry for the mistake Jan.
> I applied the two patches (after fixing lots of rejects because that
> code had already changed a lot). But I have my doubts it is complete.
>
> e.g. the NMI watchdog nmi code has lots of callees which you don't
> handle (notifier chains, spinlocks, printks which can call practically everything, ...)
>
> The printk in the NMI handler look pretty bogus so I just removed it.
I had done the same in my local repository (^-^).
> But all the other code would be tricky. but .e.g. marking up
> spinlocks would be probably not a good idea.
>
> When we oops (call die) perhaps we can force kprobes to be disabled?
>
> Also everybody hooking into the die chain would need to be covered too.
>
> Probably some followon work is needed.
Agreed. In fact I am currently working on that. I sent the previous
patches just to get started.
Thank you,
Fernando
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