Subject: Re: bug#44261: running a daemon with userns in relocateble pack breaks
From: Ludovic Courtès <[email-masked]>
To: Jan Nieuwenhuizen <[email-masked]>
Cc: [email-masked]
Date: Sat, 31 Oct 2020 23:19:49 +0100
List-Id: <debbugs-submit.debbugs.gnu.org>

Hi,

Jan Nieuwenhuizen <[email-masked]> skribis:

> Ludovic Courtès writes:

[...]

>> The attached patch adds a test loosely based on yours and a fix for
>> that.  The fix (for the “userns” engine) is to make NEW_ROOT a tmpfs,
>> such that upon completion, all we need to do is to unmount it and remove
>> it; it lives on as the root file system of child processes.
>>
>> In the “fakechroot” case, we have to leave NEW_ROOT behind, which is not
>> great but acceptable (it’s user-owned, #o700, and it’s under /tmp).  The
>> test only checks the “userns” engine.
>
> Yes, I think this is acceptable.
>
>> If you confirm that it works for you and looks reasonable, we can apply
>> it.
>
> Yes, this works.  The test and also my reproducer now work fine.

Thanks for checking, I pushed the fix as
bfe82fe2f6e9f34c0774fe2114cdc7e937ba8bd2.

Ludo’.