From: Oleg Nesterov <oleg@redhat.com>
To: Matthew Dempsky <mdempsky@chromium.org>
Cc: Kees Cook <keescook@chromium.org>,
Julien Tinnes <jln@chromium.org>,
Roland McGrath <mcgrathr@chromium.org>,
Jan Kratochvil <jan.kratochvil@redhat.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3] ptrace: Fix fork event messages across pid namespaces
Date: Mon, 7 Apr 2014 21:24:19 +0200 [thread overview]
Message-ID: <20140407192419.GB24607@redhat.com> (raw)
In-Reply-To: <CAF52+S4hs2oM_qw9Zo-6qiOp_-Cyt3ZpL+zU2_MUv=d7UKPqEA@mail.gmail.com>
On 04/02, Matthew Dempsky wrote:
>
> On Wed, Apr 2, 2014 at 2:58 PM, Matthew Dempsky <mdempsky@google.com> wrote:
> > Otherwise, it looks like (e.g.) the attempts to get the parent's pid
> > in fill_prstatus() and tomoyo_sys_getppid() are also theoretical races
> > of the same kind?
>
> Doh, nevermind, those functions would potentially be use null "struct
> pid" pointers, not "struct pid_namespace" pointers; and pid_nr_ns()
> guards against pid being null.
Yes, and they want the parent's pid, not ours pid in parent's namespace.
Hmm. In fact I am replying only because I am not sure fill_psinfo() is
correct, perhaps it confuses tid with tgid. I dunno.
Oleg.
next prev parent reply other threads:[~2014-04-07 19:24 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1396288478-1314-1-git-send-email-mdempsky@chromium.org>
[not found] ` <20140331181651.GA27686@redhat.com>
[not found] ` <CAF52+S5i7oqJnJ1NN0bk5Vg=CiYrussw0AunteE72kMMcWkeJA@mail.gmail.com>
2014-04-01 18:52 ` [PATCH v2] Fix ptrace events across pid namespaces Oleg Nesterov
2014-04-01 20:44 ` Matthew Dempsky
2014-04-01 22:29 ` [PATCH v3] ptrace: Fix fork event messages " Matthew Dempsky
2014-04-02 0:39 ` Matthew Dempsky
2014-04-02 14:58 ` Oleg Nesterov
2014-04-02 15:44 ` [PATCH 0/1] pid_namespace: pidns_get() should check task_active_pid_ns() != NULL Oleg Nesterov
2014-04-02 15:45 ` [PATCH 1/1] " Oleg Nesterov
2014-04-02 16:53 ` Eric W. Biederman
2014-04-02 15:58 ` Oleg Nesterov
2014-04-02 22:01 ` Eric W. Biederman
2014-04-02 21:58 ` [PATCH v3] ptrace: Fix fork event messages across pid namespaces Matthew Dempsky
2014-04-02 22:37 ` Matthew Dempsky
2014-04-07 19:24 ` Oleg Nesterov [this message]
2014-04-03 2:26 ` [PATCH v4] " Matthew Dempsky
2014-04-03 15:44 ` Oleg Nesterov
2014-04-03 16:13 ` Oleg Nesterov
2014-04-03 18:07 ` Matthew Dempsky
2014-04-07 19:06 ` Oleg Nesterov
2014-04-29 20:20 ` [RESEND PATCH " Matthew Dempsky
2014-04-29 22:11 ` Andrew Morton
2014-04-30 0:34 ` [PATCH v5] " Matthew Dempsky
2014-04-30 11:51 ` Oleg Nesterov
2014-04-30 20:16 ` Andrew Morton
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