From: "Anton V. Boyarshinov" <boyarsh@altlinux.org>
To: Christian Brauner <brauner@kernel.org>
Cc: viro@zeniv.linux.org.uk, linux-fsdevel@vger.kernel.org,
ebiederm@xmission.com, legion@kernel.org, ldv@altlinux.org,
linux-kernel@vger.kernel.org,
kernel-hardening@lists.openwall.com,
Christoph Hellwig <hch@lst.de>,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [PATCH] Add ability to disallow idmapped mounts
Date: Fri, 4 Feb 2022 13:26:16 +0300 [thread overview]
Message-ID: <20220204132616.28de9c4a@tower> (raw)
In-Reply-To: <20220204094515.6vvxhzcyemvrb2yy@wittgenstein>
В Fri, 4 Feb 2022 10:45:15 +0100
Christian Brauner <brauner@kernel.org> пишет:
> If you want to turn off idmapped mounts you can already do so today via:
> echo 0 > /proc/sys/user/max_user_namespaces
It turns off much more than idmapped mounts only. More fine grained
control seems better for me.
> They can neither
> be created as an unprivileged user nor can they be created inside user
> namespaces.
But actions of fully privileged user can open non-obvious ways to
privilege escalation.
next prev parent reply other threads:[~2022-02-04 10:26 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-04 6:53 [PATCH] Add ability to disallow idmapped mounts Anton V. Boyarshinov
2022-02-04 9:45 ` Christian Brauner
2022-02-04 10:26 ` Anton V. Boyarshinov [this message]
2022-02-04 15:10 ` Christian Brauner
2022-02-05 7:57 ` Anton V. Boyarshinov
2022-02-05 13:57 ` James Bottomley
2022-02-06 13:47 ` Christian Brauner
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=20220204132616.28de9c4a@tower \
--to=boyarsh@altlinux.org \
--cc=brauner@kernel.org \
--cc=ebiederm@xmission.com \
--cc=hch@lst.de \
--cc=kernel-hardening@lists.openwall.com \
--cc=ldv@altlinux.org \
--cc=legion@kernel.org \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--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