Migration to trusted keys: sealing user-provided key?

[David Howells]

Jan Lübbe <jlu at pengutronix.de> wrote:

> ... But at this point, you can still do 'keyctl read' on that key, exposing
> the key material to user space.

I wonder if it would help to provide a keyctl function to mark a key as being
permanently unreadable - so that it overrides the READ permission bit.

Alternatively, you can disable READ and SETATTR permission - but that then
prevents you from removing other perms if you want to :-/

David