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Date: Tue, 16 Apr 2024 19:13:50 -0400
From: Demi Marie Obenour <>
Subject: Re: Linux: Disabling network namespaces

On Tue, Apr 16, 2024 at 11:31:43PM +0200, Philippe Cerfon wrote:
> Hey.
> There's even an allegedly "wontfix" bug of mine where I requested that
> Debian switches back to a secure default and disables user namesapce which
> have a long history of being exploitable:
> Don't think the current hole one will have been the last one.
> Unfortunately it seems a feature that only a group of people will need is
> valued more important than keeping users secure. :-(

The problem with disabling unprivileged userns is that in the desktop
Linux case it actually causes serious problems, because creating a
sandbox is now a privileged operation.  IMO Landlock + seccomp is a much
better solution for sandboxing, but I don't think it can do everything
browsers need yet.

For containers, I'm not aware of a good solution right now.
Demi Marie Obenour (she/her/hers)
Invisible Things Lab

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