From: Serge Hallyn <serge.hallyn@ubuntu.com>
To: Christoph Lameter <cl@linux.com>
Cc: "Serge E. Hallyn" <serge@hallyn.com>,
Serge Hallyn <serge.hallyn@canonical.com>,
Andy Lutomirski <luto@amacapital.net>,
Aaron Jones <aaronmdjones@gmail.com>, Ted Ts'o <tytso@mit.edu>,
linux-security-module@vger.kernel.org, akpm@linuxfoundation.org,
"Andrew G. Morgan" <morgan@kernel.org>,
Mimi Zohar <zohar@linux.vnet.ibm.com>,
Austin S Hemmelgarn <ahferroin7@gmail.com>,
Markku Savela <msa@moth.iki.fi>,
Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
linux-kernel@vger.kernel.org, linux-api@vger.kernel.org,
Michael Kerrisk <mtk.manpages@gmail.com>,
Jonathan Corbet <corbet@lwn.net>
Subject: Re: [PATCH] capabilities: Ambient capability set V1
Date: Wed, 25 Feb 2015 03:32:47 +0000 [thread overview]
Message-ID: <20150225033247.GC29685@ubuntumail> (raw)
In-Reply-To: <alpine.DEB.2.11.1502241120270.29416@gentwo.org>
Quoting Christoph Lameter (cl@linux.com):
> On Tue, 24 Feb 2015, Serge Hallyn wrote:
>
> > Unless I'm misunderstanding what you are saying, apps do have surprises.
> > They drop capabilities, execute a file, and the result has capabilities
> > which the app couldn't have expected. At least if the bits have to be
> > in fI to become part of pP', the app has a clue.
>
> Well yes but the surprises do not occur in the cap bits they are
> manipulating or inspecting via prctl.
>
> > To be clear, I'm suggesting that the rules at exec become:
> >
> > pI' = pI
>
> Ok that is new and on its own may solve the issue?
No that's not new.
> > pA' = pA (pA is ambient)
>
> Thats what this patch does
>
> > pP' = (X & fP) | (pI & (fI | pA))
>
> Hmmm... fP is empty for the file not having caps. so
>
> pP' = pI & pA
Right.
> > pE' = pP' & fE
>
> fE? So the inherited caps are not effective? fE would be empty for a file
> not having caps thus the ambient caps would not be available in the child.
Yeah we could make this
pE' = pP' & (fE | pA)
-serge
next prev parent reply other threads:[~2015-02-25 3:32 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-05 21:56 [PATCH] capabilities: Ambient capability set V1 Christoph Lameter
[not found] ` <alpine.DEB.2.11.1502051554500.4876-gkYfJU5Cukgdnm+yROfE0A@public.gmane.org>
2015-02-23 14:58 ` Christoph Lameter
2015-02-23 15:44 ` Andy Lutomirski
[not found] ` <CALCETrWJCcBBGGp21C4cdtiU79K-P3t+6rFJUWcXcLR1jqrrFQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-02-23 15:53 ` Christoph Lameter
2015-02-23 15:59 ` Andy Lutomirski
2015-02-23 16:41 ` Christoph Lameter
2015-02-23 23:51 ` Andy Lutomirski
2015-02-24 15:48 ` Christoph Lameter
2015-02-23 16:16 ` Serge Hallyn
2015-02-23 16:33 ` Andy Lutomirski
[not found] ` <CALCETrW78805ayUL=ZYBdFwVdDvJZus2JL0VVmEBE8=L1Nm5Sw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-02-23 16:45 ` Serge E. Hallyn
2015-02-23 16:47 ` Christoph Lameter
2015-02-23 16:44 ` Christoph Lameter
2015-02-23 16:46 ` Serge E. Hallyn
2015-02-23 16:50 ` Christoph Lameter
2015-02-23 18:15 ` Serge Hallyn
2015-02-23 18:27 ` Christoph Lameter
2015-02-24 5:19 ` Serge E. Hallyn
[not found] ` <20150224051928.GA14755-7LNsyQBKDXoIagZqoN9o3w@public.gmane.org>
2015-02-24 15:47 ` Serge E. Hallyn
2015-02-24 15:58 ` Christoph Lameter
2015-02-24 16:44 ` Serge Hallyn
2015-02-24 17:28 ` Christoph Lameter
2015-02-25 3:32 ` Serge Hallyn [this message]
2015-02-25 20:25 ` Christoph Lameter
2015-02-26 15:35 ` Serge E. Hallyn
[not found] ` <20150226153524.GC15182-7LNsyQBKDXoIagZqoN9o3w@public.gmane.org>
2015-02-26 18:28 ` Christoph Lameter
2015-02-26 19:32 ` Serge E. Hallyn
2015-02-26 19:38 ` Andy Lutomirski
[not found] ` <CALCETrWpKiurZEEOT25i_xrtQyk5dht+wjUO4+tGs+N_7JCdYA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-02-26 20:16 ` Christoph Lameter
2015-02-26 20:33 ` Serge E. Hallyn
[not found] ` <20150226193200.GA17709-7LNsyQBKDXoIagZqoN9o3w@public.gmane.org>
2015-02-26 20:13 ` Christoph Lameter
2015-02-26 20:34 ` Serge E. Hallyn
2015-02-26 20:51 ` Andy Lutomirski
2015-02-26 20:55 ` Serge E. Hallyn
[not found] ` <20150226205512.GA19273-7LNsyQBKDXoIagZqoN9o3w@public.gmane.org>
2015-02-26 20:58 ` Andy Lutomirski
2015-02-26 21:19 ` Serge E. Hallyn
2015-02-26 21:29 ` Christoph Lameter
2015-02-26 21:09 ` Christoph Lameter
[not found] ` <alpine.DEB.2.11.1502261507450.8274-gkYfJU5Cukgdnm+yROfE0A@public.gmane.org>
2015-02-26 21:13 ` Serge E. Hallyn
2015-02-26 21:23 ` Christoph Lameter
2015-02-26 21:32 ` Serge E. Hallyn
2015-02-26 21:37 ` Christoph Lameter
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