From: Aleksa Sarai <cyphar@cyphar.com>
To: "Enrico Weigelt, metux IT consult" <lkml@metux.net>
Cc: Christian Brauner <christian@brauner.io>,
torvalds@linux-foundation.org, viro@zeniv.linux.org.uk,
jannh@google.com, dhowells@redhat.com, linux-api@vger.kernel.org,
linux-kernel@vger.kernel.org, serge@hallyn.com, luto@kernel.org,
arnd@arndb.de, ebiederm@xmission.com, keescook@chromium.org,
tglx@linutronix.de, mtk.manpages@gmail.com,
akpm@linux-foundation.org, oleg@redhat.com,
joel@joelfernandes.org, dancol@google.com
Subject: Re: RFC: on adding new CLONE_* flags [WAS Re: [PATCH 0/4] clone: add CLONE_PIDFD]
Date: Tue, 16 Apr 2019 05:59:11 +1000 [thread overview]
Message-ID: <20190415195911.z7b7miwsj67ha54y@yavin> (raw)
In-Reply-To: <dc05ffe3-c2ff-8b3e-d181-e0cc620bf91d@metux.net>
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On 2019-04-15, Enrico Weigelt, metux IT consult <lkml@metux.net> wrote:
> > This patchset makes it possible to retrieve pid file descriptors at
> > process creation time by introducing the new flag CLONE_PIDFD to the
> > clone() system call as previously discussed.
>
> Sorry, for highjacking this thread, but I'm curious on what things to
> consider when introducing new CLONE_* flags.
>
> The reason I'm asking is:
>
> I'm working on implementing plan9-like fs namespaces, where unprivileged
> processes can change their own namespace at will. For that, certain
> traditional unix'ish things have to be disabled, most notably suid.
> As forbidding suid can be helpful in other scenarios, too, I thought
> about making this its own feature. Doing that switch on clone() seems
> a nice place for that, IMHO.
Just spit-balling -- is no_new_privs not sufficient for this usecase?
Not granting privileges such as setuid during execve(2) is the main
point of that flag.
--
Aleksa Sarai
Senior Software Engineer (Containers)
SUSE Linux GmbH
<https://www.cyphar.com/>
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next prev parent reply other threads:[~2019-04-15 19:59 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-14 20:14 [PATCH 0/4] clone: add CLONE_PIDFD Christian Brauner
2019-04-14 20:14 ` [PATCH 1/4] Make anon_inodes unconditional Christian Brauner
2019-04-14 20:14 ` [PATCH 2/4] clone: add CLONE_PIDFD Christian Brauner
2019-04-15 10:52 ` Oleg Nesterov
2019-04-15 11:42 ` Christian Brauner
2019-04-15 13:24 ` Oleg Nesterov
2019-04-15 13:52 ` Christian Brauner
2019-04-15 16:25 ` Joel Fernandes
2019-04-15 17:15 ` Jonathan Kowalski
2019-04-15 19:39 ` Daniel Colascione
2019-04-14 20:14 ` [PATCH 3/4] signal: support CLONE_PIDFD with pidfd_send_signal Christian Brauner
2019-04-14 20:14 ` [PATCH 4/4] samples: show race-free pidfd metadata access Christian Brauner
2019-04-15 10:08 ` RFC: on adding new CLONE_* flags [WAS Re: [PATCH 0/4] clone: add CLONE_PIDFD] Enrico Weigelt, metux IT consult
2019-04-15 15:50 ` Serge E. Hallyn
2019-04-16 18:32 ` Enrico Weigelt, metux IT consult
2019-04-29 15:49 ` Serge E. Hallyn
2019-04-29 17:31 ` Enrico Weigelt, metux IT consult
2019-05-05 2:32 ` Serge E. Hallyn
2019-04-15 19:59 ` Aleksa Sarai [this message]
2019-04-15 20:29 ` Andy Lutomirski
2019-04-15 21:27 ` Jonathan Kowalski
2019-04-15 23:58 ` Andy Lutomirski
2019-04-16 18:45 ` Enrico Weigelt, metux IT consult
2019-04-16 21:31 ` Andy Lutomirski
2019-04-17 12:03 ` Enrico Weigelt, metux IT consult
2019-04-17 12:54 ` Christian Brauner
2019-04-18 15:46 ` Enrico Weigelt, metux IT consult
2019-04-17 12:19 ` Florian Weimer
2019-04-17 16:46 ` Andy Lutomirski
2019-04-20 7:14 ` Kevin Easton
2019-04-20 11:15 ` Christian Brauner
2019-04-20 15:06 ` Daniel Colascione
2019-04-29 19:30 ` Jann Horn
2019-04-29 19:55 ` Jann Horn
2019-04-29 20:21 ` Linus Torvalds
2019-04-29 20:38 ` Florian Weimer
2019-04-29 20:51 ` Christian Brauner
2019-04-29 21:31 ` Linus Torvalds
2019-04-30 7:01 ` Florian Weimer
2019-04-30 0:38 ` Jann Horn
2019-04-30 2:16 ` Linus Torvalds
2019-04-30 8:21 ` Florian Weimer
2019-04-30 16:19 ` Linus Torvalds
2019-04-30 16:26 ` Linus Torvalds
2019-04-30 17:07 ` Florian Weimer
2019-04-30 12:39 ` Oleg Nesterov
2019-04-30 16:24 ` Linus Torvalds
2019-04-29 20:49 ` Florian Weimer
2019-04-29 20:52 ` Christian Brauner
2019-04-20 15:28 ` Al Viro
2019-04-16 18:37 ` Enrico Weigelt, metux IT consult
2019-04-15 10:16 ` [PATCH 0/4] clone: add CLONE_PIDFD Enrico Weigelt, metux IT consult
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