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SubjectRe: [RCF] [PATCH] unprivileged mount/umount
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> What if proc filesystem is removed from the kernel?
>
> Ability to access some other namespace through the proc filesystem does
> not look clean. I think it should be cleanly supported through VFS.
>
> Also cd'ing into a new namespace just allows you to browse through
> the other namespace. But it does not effectively change the process's
> namespace. Things like mount in the other namespace will be failed
> by check_mount() anyway.
>
> I think, we need sys calls like sys_cdnamespace() which switches to a
> new namespace.

Jamie's proposal was to make chroot() swich namespace.

> Effectively the process's current->namespace has to be modified,
> for the process to be effectively work in the new namespace.

current->namespace could be dropped altogether, and
current->current->fs->rootmnt->mnt_namespace could be used instead.

It's a nice logical extension of chroot(), without needing new
syscalls.

Miklos
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