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Date: Thu, 11 May 2023 17:20:20 +0200
From: Florian Weimer <fweimer@...hat.com>
To: Tobias Heider <tobias.heider@...onical.com>
Cc: oss-security@...ts.openwall.com, Turritopsis Dohrnii Teo En Ming
<tdtemccnp@...il.com>, ceo@...-en-ming-corp.com, Piotr Krysiuk
<piotras@...il.com>
Subject: Re: New Linux kernel NetFilter flaw gives attackers
root privileges
* Tobias Heider:
> Another thing worth mentioning is that the apparmor team has done some very
> interesting work on providing finer control over unprivileged user namespaces
> on a per application basis:
> https://gitlab.com/apparmor/apparmor/-/wikis/unprivileged_userns_restriction
>
> This would allow having opt-in unprivileged userns support only for
> confined and explicitly permitted applications and could hopefully
> drastically reduce the impact of similar bugs in the future.
Doesn't unprivileged chroot need user namespace support? So a side
effect of disabling it might be to force applications to switch to
userspace emulation of pathname lookup. That doesn't seem like a good
tradeoff?
Thanks,
Florian
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