Re: [PATCH v2] selinux: Permit bounded transitions under NO_NEW_PRIVS or NOSUID.

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On Tue, Aug 12, 2014 at 12:08 PM, Paul Moore <paul@xxxxxxxxxxxxxx> wrote:
> On Tuesday, August 12, 2014 11:56:42 AM Andy Lutomirski wrote:
>> On Aug 12, 2014 11:07 AM, "Stephen Smalley" <sds@xxxxxxxxxxxxx> wrote:
>> > On 08/12/2014 02:01 PM, Andy Lutomirski wrote:
>> > > On Mon, Aug 4, 2014 at 10:36 AM, Stephen Smalley wrote:
>> > >> If the callee SID is bounded by the caller SID, then allowing
>> > >> the transition to occur poses no risk of privilege escalation and we
>> > >> can therefore safely allow the transition to occur.  Add this exemption
>> > >> for both the case where a transition was explicitly requested by the
>> > >> application and the case where an automatic transition is defined in
>> > >> policy.
>> > >
>> > > This still wants something like security_bounded_transition_noaudit,
>> > > right?  (Or just a parameter about whether to audit -- there will only
>> > > be two callers, I think.)
>> >
>> > I think generating an audit record is correct in this case; the
>> > operation would have succeeded if the type were bounded, so it is
>> > correct and helpful to report this to the audit log for diagnosing
>> > failures.  I think Paul's prior objection was that you could end up with
>> > an audit record even when the operation succeeded when we allowed the
>> > transitions on either a bounded transition or dyntransition permission,
>> > but that is no longer the case.
>>
>> Fair enough.
>
> Yes, the audit problem is no longer an issue and the comments look good to me.
>
>> Does this have any chance of making 3.17?
>
> No.  That ship has sailed.
>
> However, I would still like to see some more Reviewed-by/Tested-by mails
> before we merge this for 3.18.  Andy, based on discussion on this thread and
> previous threads, I assume you're happy with this patch?

Yes.

Reviewed-by: Andy Lutomirski <luto@xxxxxxxxxxxxxx>

Not actually tested-by because I don't have the slightest clue how to
write a bounded transition rule to test with.

--Andy

>
> --
> paul moore
> www.paul-moore.com
>



-- 
Andy Lutomirski
AMA Capital Management, LLC
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