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Message-ID: <20250714-zerkratzen-untrennbar-780218a73780@brauner>
Date: Mon, 14 Jul 2025 10:10:44 +0200
From: Christian Brauner <brauner@...nel.org>
To: Prabhakar Pujeri <prabhakar.pujeri@...il.com>
Cc: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Prabhakar Pujeri <prabhakar.pujeri@...l.com>
Subject: Re: [PATCH] fs: warn on mount propagation in unprivileged user
 namespaces

On Mon, Jul 14, 2025 at 03:05:56AM -0400, Prabhakar Pujeri wrote:
> Mount propagation operations in unprivileged user namespaces can
> bypass isolation. Add a pr_warn_once warning in mount(2) and
> mount_setattr(2) when MS_SHARED, MS_SLAVE, or MS_UNBINDABLE
> propagation flags are used without CAP_SYS_ADMIN. Document the warning
> in sharedsubtree.rst with an explanation why it is emitted and how to
> avoid it.
> ---

This doesn't make sense at all. So no, we're not going to take this.
Rejected-by: Christian Brauner <brauner@...nel.org>

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