From: "Enrico Weigelt, metux IT consult" <lkml@metux.net>
To: 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
Cc: 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, cyphar@cyphar.com, joel@joelfernandes.org,
dancol@google.com
Subject: RFC: on adding new CLONE_* flags [WAS Re: [PATCH 0/4] clone: add CLONE_PIDFD]
Date: Mon, 15 Apr 2019 12:08:09 +0200 [thread overview]
Message-ID: <dc05ffe3-c2ff-8b3e-d181-e0cc620bf91d@metux.net> (raw)
In-Reply-To: <20190414201436.19502-1-christian@brauner.io>
On 14.04.19 22:14, Christian Brauner wrote:
Hi folks,
> 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.
As there might be potentially even more CLONE_* flags in the future,
and the bitmask size is limited, this raises the question on how to
proceed with those flag additions in the future.
What's your thoughts on that ?
--mtx
--
Enrico Weigelt, metux IT consult
Free software and Linux embedded engineering
info@metux.net -- +49-151-27565287
next prev parent reply other threads:[~2019-04-15 10:09 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 ` Enrico Weigelt, metux IT consult [this message]
2019-04-15 15:50 ` RFC: on adding new CLONE_* flags [WAS Re: [PATCH 0/4] clone: add CLONE_PIDFD] 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
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=dc05ffe3-c2ff-8b3e-d181-e0cc620bf91d@metux.net \
--to=lkml@metux.net \
--cc=akpm@linux-foundation.org \
--cc=arnd@arndb.de \
--cc=christian@brauner.io \
--cc=cyphar@cyphar.com \
--cc=dancol@google.com \
--cc=dhowells@redhat.com \
--cc=ebiederm@xmission.com \
--cc=jannh@google.com \
--cc=joel@joelfernandes.org \
--cc=keescook@chromium.org \
--cc=linux-api@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=luto@kernel.org \
--cc=mtk.manpages@gmail.com \
--cc=oleg@redhat.com \
--cc=serge@hallyn.com \
--cc=tglx@linutronix.de \
--cc=torvalds@linux-foundation.org \
--cc=viro@zeniv.linux.org.uk \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
Powered by JetHome