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From: Tycho Andersen <tycho@tycho.ws>
To: Andy Lutomirski <luto@amacapital.net>
Cc: Kees Cook <keescook@chromium.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Linux Containers <containers@lists.linux-foundation.org>,
	Linux API <linux-api@vger.kernel.org>,
	Oleg Nesterov <oleg@redhat.com>,
	"Eric W. Biederman" <ebiederm@xmission.com>,
	"Serge E. Hallyn" <serge@hallyn.com>,
	Christian Brauner <christian.brauner@ubuntu.com>,
	Tyler Hicks <tyhicks@canonical.com>,
	Akihiro Suda <suda.akihiro@lab.ntt.co.jp>,
	Jann Horn <jannh@google.com>
Subject: Re: [PATCH v6 4/5] seccomp: add support for passing fds via USER_NOTIF
Date: Tue, 25 Sep 2018 06:53:27 -0600	[thread overview]
Message-ID: <20180925125327.GB9537@cisco> (raw)
In-Reply-To: <CALCETrWEr_VAtJu1mm1akTigsRUXAA7_7RHb-WGHqnyNy=j17Q@mail.gmail.com>

On Thu, Sep 20, 2018 at 07:18:45PM -0700, Andy Lutomirski wrote:
> Hmm.  This does mean that we need a test case for a user notifier
> returning -ERESTARTSYS.  It should Just Work (tm), but those are
> famous last words.

Just to confirm, I've got a test case that works like this:

1. fork and install a SIGUSR1 handler
2. tracee does a syscall that gets trapped
3. send SIGUSR1
4. respond from the listener with -ERESTARTSYS
5. see another of the same syscall, even though the tracee still thinks
   its in the first one
6. respond with something reasonable, the tracee sees this response

I think that's the intended behavior. Note that when the listener
responds with -ERESTARTSYS and there is no signal pending, the task
just dies. That might be reasonable, I'm not sure.

Tycho

  parent reply	other threads:[~2018-09-25 12:53 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
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 [this message]
2018-09-06 15:28 ` [PATCH v6 5/5] samples: add an example of seccomp user trap Tycho Andersen

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