> >
> > I'm asking you to expand on what the problems would be if we were to
> > enhance the namespace code as suggested.
>
> OK, what I was thinking, is that the user could create a new
> namespace, that has all the filesystems remounted 'nosuid'. This
> wouldn't need any new kernel infrastructure, just a suid-root program
> (e.g. newns_nosuid), that would do a clone(CLONE_NEWNS), then
> recursively remount everything 'nosuid' in the new namespace. Then
> restore the user's privileges, and exec a shell.
>
I'm confused why everything has to be remounted nosuid. I understand
enforcing synthetics to be mounted nosuid, but not the rest of the
file systems. I thought all the problems revolving around the private
namespace solution where the FUSE team's desire to have per-user
namespace and/or per-session namespace versus per-process namespace.
-eric
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