Quoting David Newall ([email protected]):
> Bill Davidsen wrote:
>> there is no question that pivot_root is intended to have breadth for more
>> than one process.
>
> I think it's clear from the man page that the original idea was to be able
> to pivot_root for individual processes. The reason it doesn't do that, the
> reason it affects all processes, is to work around the bootstrap problem,
> where processes that don't care what their root (or current) directory is
> are still using the original root.
>
> An extra parameter could be added to specify which behavior is desired,
> probably defaulting to the current behavior. That would remove the need to
> use a chroot bug.
No reason for any new parameters to pivot_root. Just clone your mounts
namespace first.
unshare(CLONE_NEWNS);
chdir(new_dir);
pivot_root(new_dir, oldroot);
Since pivot_root actually fiddles with the vfsmnts, this is really the
only way to go about having it "work with just one process".
-serge
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