[PATCH v5 1/1] fs: Allow no_new_privs tasks to call chroot(2)

Mickaël Salaün mic at digikod.net
Sat Mar 27 18:56:23 UTC 2021

On 27/03/2021 00:12, Askar Safin wrote:
> 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/ .)

We know that userns can be use to get the required capability in a new
namespace, but this patch is to not require to use this namespace, as
explained in the commit message. I already added some comments in the
LWN article though.

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

openat2 was also discussed in previous versions of this patch.

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