"Serge E. Hallyn" <serge@xxxxxxxxxx> writes:
> Quoting Eric W. Biederman (ebiederm@xxxxxxxxxxxx):
>> A child user namespace having capabilities against processes in it's
>> parent seems totally bizarre and pretty dangerous from a capabilities
>> standpoint.
>
> How would it have them against its parent?
init_user_ns
userns a --- created by kuid 1
userns b -- created by kuid 2
process c in userns b with kuid 1
Serge read the first permisison check in common_cap.
Think what happens in the above example.
For the rest I understand your concern.
Serge please read and look at the patches I have posted to fix
the issues Andy found with the user namespace tree. Especially
the fix to commit_creds.
After you have looked at the patches to fix the issues I will
be happy to discuss things further with you.
Eric
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