Re: [PATCH] userns/capability: Add user namespace capability

[Richard Weinberger]

On Sat, Oct 17, 2015 at 5:58 PM, Tobias Markus <tobias@xxxxxxxxx> wrote:
> One question remains though: Does this break userspace executables that
> expect being able to create user namespaces without priviledge? Since
> creating user namespaces without CAP_SYS_ADMIN was not possible before
> Linux 3.8, programs should already expect a potential EPERM upon calling
> clone. Since creating a user namespace without CAP_SYS_USER_NS would
> also cause EPERM, we should be on the safe side.

In case of doubt, yes it will break existing software.
Hiding user namespaces behind CAP_SYS_USER_NS will not magically
make them secure.

-- 
Thanks,
//richard
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