Re: [RFC] capabilities: Ambient capabilities

[Andy Lutomirski]

On Apr 24, 2015 2:15 PM, "Serge E. Hallyn" <serge@xxxxxxxxxx> wrote:
>
> On Fri, Apr 24, 2015 at 01:18:44PM -0700, Andy Lutomirski wrote:
> > On Fri, Apr 24, 2015 at 1:13 PM, Christoph Lameter <cl@xxxxxxxxx> wrote:
> > > On Fri, 24 Apr 2015, Andy Lutomirski wrote:
> > >
> > >> That's sort of what my patch does -- you need CAP_SETPCAP to switch
> > >> the securebit.
> > >>
> > >> But Christoph's patch required it to add caps to the ambient set, right?
> > >
> > > Yes but you seem to be just adding one additional step without too much of
> > > a benefit because you still need CAP_SETPCAP.
> > >
> >
> > No, because I set the default to on :)
>
> Right - I definately prefer
>
> . default off
> . CAP_SETPCAP required to turn it on (for self and children)
> . once on, anyone can copy bits from (whatever we decided) to pA.
>

Why default off?  If there's some weird reason that switching it on
could cause a security problem, then I'd agree, but I haven't spotted
a reason yet.

--Andy
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