Re: [PATCH 03/04] Add encryption ops to the keyctl syscall

[David Härdeman <david@2gen.com>]

On Tue, Jan 24, 2006 at 10:58:24AM +0000, David Howells wrote:
> > +	key = key_ref_to_ptr(key_ref);
> > +
> > +	/* see if we can read it directly */
> > +	ret = key_permission(key_ref, KEY_READ);
>
> You don't actually need to calculate key until after you've done all those
> checks, so I'd move it further down the file. You can use the function to
> release key references in the error handling or have a separate error handling
> return path.

Do you mean that I should move the key_ref_to_ptr call to right after 
the can_read_key label? If that is the case, shouldn't the same thing be 
done for keyctl_read_key?

> > +			down_read(&key->sem);
> > +			ret = key->type->encrypt(key, data, dlen, result, rlen);
> > +			up_read(&key->sem);
>
> Do we really want to restrict the key type implementor to using the r/w
> semaphore. Would it be better to let the type decide whether it wants to use
> the semaphore or let it use RCU if it so desires?

Ok, I'll move the semaphore into the dsa key type instead and change the 
appropriate comments.

Re,
David
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