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From: Tycho Andersen <tycho@tycho.ws>
To: Michael Tirado <mtirado418@gmail.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
	Kees Cook <keescook@chromium.org>,
	Andy Lutomirski <luto@amacapital.net>
Subject: Re: [PATCH v6 3/5] seccomp: add a way to get a listener fd from ptrace
Date: Sun, 21 Oct 2018 17:00:45 +0100	[thread overview]
Message-ID: <20181021160045.GA25202@cisco> (raw)
In-Reply-To: <CAMkWEXOywaUUy3=G+26G1uYOPw-pq-Wq68xSPmShuAMCGwfcbQ@mail.gmail.com>

On Wed, Oct 17, 2018 at 06:15:47PM +0000, Michael Tirado wrote:
> Tycho, Sorry for the duplicate, I forgot to CC the list :(
> 
> On Wed, Oct 17, 2018 at 3:00 PM Tycho Andersen <tycho@tycho.ws> wrote:
> >
> >
> > That's one of the use cases, but there are a large number of others. I
> > discuss a few in patch 1:
> > https://www.spinics.net/lists/linux-containers/msg33956.html
> >
> 
> Thanks this is making more sense to me now.
> 
> I haven't been keeping up with the list and just did a bunch
> of reading. It seems that stackable LSM's are making some real
> progress now, and I wonder if those patches are merged would
> using a stacked security module approach be worth exploring if
> it provides the same or greater flexibility, and assuming all
> syscalls of interest can be hooked somehow?

Sorry, I somehow just noticed that this was a duplicate and the one I
replied to was the off-list one. Anyway, no, I don't think that'll
work. The LSM code right now can't do anything besides refuse an
access, and that's a very specific design constraint of it. In
particular, it can't mutate any task state or anything.

What we want in this series is basically the equivalent of
SECCOMP_RET_TRACE, without having to involve ptrace (for a variety of
reasons, mostly that applications want to use ptrace for their own
things). So seccomp seems like the most natural fit.

Tycho

  reply	other threads:[~2018-10-21 16:00 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-06 15:28 [PATCH v6 0/5] seccomp trap to userspace Tycho Andersen
2018-09-06 15:28 ` [PATCH v6 1/5] seccomp: add a return code to " Tycho Andersen
2018-09-06 22:15   ` Tyler Hicks
2018-09-07 15:45     ` Tycho Andersen
2018-09-08 20:35     ` Tycho Andersen
2018-09-06 15:28 ` [PATCH v6 2/5] seccomp: make get_nth_filter available outside of CHECKPOINT_RESTORE Tycho Andersen
2018-09-11 10:25   ` kbuild test robot
2018-09-11 10:25     ` kbuild test robot
2018-09-06 15:28 ` [PATCH v6 3/5] seccomp: add a way to get a listener fd from ptrace Tycho Andersen
2018-09-06 15:45   ` Jann Horn
2018-09-06 15:50     ` Tycho Andersen
2018-09-13  0:00   ` Andy Lutomirski
2018-09-13  9:24     ` Tycho Andersen
2018-10-17  7:25     ` Michael Tirado
2018-10-17 15:00       ` Tycho Andersen
     [not found]         ` <CAMkWEXM1c7AGTH=tpgoHtPnFFY-V+05nGOU90Sa1E3EPY9OhKQ@mail.gmail.com>
2018-10-17 18:15           ` Michael Tirado
2018-10-21 16:00             ` Tycho Andersen [this message]
2018-10-17 18:31       ` Kees Cook
2018-09-06 15:28 ` [PATCH v6 4/5] seccomp: add support for passing fds via USER_NOTIF Tycho Andersen
2018-09-06 16:15   ` Jann Horn
2018-09-06 16:22     ` Tycho Andersen
2018-09-06 18:30       ` Tycho Andersen
2018-09-10 17:00         ` Jann Horn
2018-09-11 20:29           ` Tycho Andersen
2018-09-12 23:52   ` Andy Lutomirski
2018-09-13  9:25     ` Tycho Andersen
2018-09-13  9:42     ` Aleksa Sarai
2018-09-19  9:55     ` Tycho Andersen
2018-09-19 14:19       ` Andy Lutomirski
2018-09-19 14:38         ` Tycho Andersen
2018-09-19 19:58           ` Andy Lutomirski
2018-09-20 23:42             ` Tycho Andersen
2018-09-20 23:42               ` Tycho Andersen
2018-09-21  2:18               ` Andy Lutomirski
2018-09-21 13:39                 ` Tycho Andersen
2018-09-21 18:27                   ` Andy Lutomirski
2018-09-21 22:03                     ` Tycho Andersen
2018-09-21 20:46                   ` Jann Horn
2018-09-25 12:53                 ` Tycho Andersen
2018-09-06 15:28 ` [PATCH v6 5/5] samples: add an example of seccomp user trap Tycho Andersen

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