svn commit: r240067 - head/sys/kern

[Garrett Cooper]

On Mon, Sep 3, 2012 at 2:23 AM, Aleksandr Rybalko <ray at freebsd.org> wrote:
> On Mon, 3 Sep 2012 02:05:15 -0700
> Garrett Cooper <yanegomi at gmail.com> wrote:
>
>>> On Sep 3, 2012, at 1:52 AM, Aleksandr Rybalko wrote:
>>>
>>> > Author: ray
>>> > Date: Mon Sep  3 08:52:05 2012
>>> > New Revision: 240067
>>> > URL: http://svn.freebsd.org/changeset/base/240067
>>> >
>>> > Log:
>>> >  Add kern.hintmode sysctl variable to show current state of hints:
>>> >  0 - loader hints in environment only;
>>> >  1 - static hints only
>>> >  2 - fallback mode (Dynamic KENV with fallback to kernel
>>> > environment) Add kern.hintmode write handler, accept only value 2.
>>> > That will switch static KENV to dynamic. So it will be possible to
>>> > change device hints.
>>>
>>> ...
>>>
>>> > +  /* Migrate from static to dynamic hints */
>>> > +  switch (hintmode) {
>>> > +  case 0:
>>> > +          if (dynamic_kenv)
>>> > +                  /* Already here */
>>> > +                  hintmode = value; /* XXX: Need we switch
>>> > or not ? */
>>> > +                  return (0);
>>>
>>> ^^^^ typo (missing braces)? ^^^^
>
> Ohhh, yeah, testing now.
> Thank you!
>
>>>
>>> Also, don't you need extra glue for jails?
>
> Why, jails uses separate hints/kenv?

I was wondering whether or not the tunables could be changed from the
jail, thus allowing someone to affect the host system or if this
memory space was effectively CoWed in some way, shape or form.

Thanks!
-Garrett