Re: [PATCH -mm 0/7] execns syscall and user namespace

Eric W. Biederman
2006-07-11T20:24:04Z

Cedric Le Goater <clg@fr.ibm.com> writes:

> Hello !
>
> The following patchset adds the user namespace and a new syscall execns.
>
> The user namespace will allow a process to unshare its user_struct table,
> resetting at the same time its own user_struct and all the associated
> accounting.
>
> The purpose of execns is to make sure that a process unsharing a namespace
> is free from any reference in the previous namespace. the execve() semantic
> seems to be the best candidate as it already flushes the previous process
> context.
>
> Thanks for reviewing, sharing, flaming !

I haven't had a chance to do a thorough review yet but why is
this needed?

What can be left shared by switching to a new namespace and then
execing an executable?

Is it not possible to ensure what you are trying to ensure with
a good user space executable?

Eric