Re: [PATCH 2/5] x86, mpx: hook #BR exception handler to allocatebound tables

From: H. Peter Anvin
Date: Fri Jan 17 2014 - 12:51:43 EST

On 01/17/2014 09:14 AM, Steven Rostedt wrote:
>>> All I'm trying to say is, it might not be such a good idea to sleep in a
>>> fault handler...
>> A fault handler from user space is really nothing other than a different
>> kind of system call. It is nothing magic about it.
> Exactly. I was saying that #BR should be just like #PF, as it can
> detect bugs in the kernel too. The first thing the handler should do is
> check to see if the fault occurred in userspace or kernel space. If it
> is userspace, then there's no restrictions. If it is kernel space then
> we should do the bare minimum to report the bug and then kill whatever
> task happened to do it.

Yes. We call this "oopsing" ;)


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