linux-kernel - Re: [PATCH v5 1/1] fs: Allow no_new

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Message-ID: <1616800362.522029786@f737.i.mail.ru>
Date:   Sat, 27 Mar 2021 02:12:42 +0300
From:   Askar Safin <safinaskar@...l.ru>
To:     Mickaël Salaün <mic@...ikod.net>,
        kernel-hardening@...ts.openwall.com, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-security-module@...r.kernel.org
Subject: Re: [PATCH v5 1/1] fs: Allow no_new_privs tasks to call chroot(2)

Hi. Unprivileged users already can do chroot. He should simply create userns and then call "chroot" inside. As an LWN commenter noted, you can simply run 
"unshare -r /usr/sbin/chroot some-dir". (I recommend reading all comments: https://lwn.net/Articles/849125/ .)

Also: if you need chroot for path resolving only, consider openat2 with RESOLVE_IN_ROOT ( https://lwn.net/Articles/796868/ ).

==
Askar Safin
https://github.com/safinaskar