On Fri, Mar 11, 2016 at 9:30 AM, Andy Lutomirski <luto@xxxxxxxxxxxxxx> wrote:
>
> What if we had an ioctl to do these data-leaking operations that took,
> as an extra parameter, an fd to the block device node. They allow
> access if the fd points to the right inode and has FMODE_READ (and LSM
> checks say it's okay). Sure, it's awkward, but it's much safer.
That sounds absolutely horrible.
I'd *much* prefer the suggestion from Alan to simply have a mount-time
option to enable it. That way, you will never get any surprises, and
no "subtle new behavior for somebody who set their system up in a way
that doesn't allow for this".
So you'd have to explicitly say "my setup is ok with hole punching".
Linus
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