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 12:04 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
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