From: Pavel Machek <pavel@ucw.cz>
To: One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>
Cc: Alex Dubov <alex.dubov@gmail.com>,
linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk,
corbet@lwn.net, richardcochran@gmail.com
Subject: Re: syscall: introduce sendfd() syscall (v.2)
Date: Sun, 7 Dec 2014 10:55:29 +0100 [thread overview]
Message-ID: <20141207095529.GA18733@amd> (raw)
In-Reply-To: <20141205132250.6f2f9ec1@lxorguk.ukuu.org.uk>
On Fri 2014-12-05 13:22:50, One Thousand Gnomes wrote:
>
> > 2.a. If task A has sufficient capabilities to send signals to task B, then
> > task A is already in position to do anything it wants with task B, including
> > killing it outright.
>
> Not entirely true.
>
> - We have securirty models like SELinux
> - We have namespaces and being able to send an fd between namespaces is
> not quite as flexible as you would make it
>
> I suspect therefore it needs security hooks but otherwise looks more sane
> than the current AF_UNIX approach.
The right test for "can do anything" is "can_ptrace()"...
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
prev parent reply other threads:[~2014-12-07 9:55 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-03 9:00 syscall: introduce sendfd() syscall (v.2) Alex Dubov
2014-12-03 9:00 ` [PATCH] " Alex Dubov
[not found] ` <CAE2SPAa3FZz6MH41UB-CmruFw0kCTq=KS5MkNXMaiEidpSGkSg@mail.gmail.com>
2014-12-06 3:55 ` Alex Dubov
2014-12-05 13:22 ` One Thousand Gnomes
2014-12-06 4:13 ` Alex Dubov
2014-12-07 9:55 ` Pavel Machek [this message]
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