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SubjectRe: [PATCH -mm 0/7] execns syscall and user namespace
Cedric Le Goater <> 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?

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