Re: [PATCH v6 02/10] x86, mpx: add MPX specific mmap interface

[Dave Hansen]

On 06/27/2014 10:34 AM, Dave Hansen wrote:
> I'm claiming that we need COW behavior for the bounds tables, at least
> by default.  If userspace knows enough about the ways that it is using
> the tables and knows how to share them, let it go to town.  The kernel
> will permit this kind of usage model, but we simply won't be helping
> with the management of the tables when userspace creates them.

Actually, this is another reason we need to mark VMAs as being
MPX-related explicitly instead of inferring it from the tables.  If
userspace does something really specialized like this, the kernel does
not want to confuse these VMAs the ones it created.


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