Re: module ref count

[Stephan Mueller <smueller@chronox.de>]

Am Dienstag, 21. April 2015, 14:56:31 schrieb Stephan Mueller:

Hi Stephan,

> Am Dienstag, 21. April 2015, 14:35:47 schrieb Stephan Mueller:
> 
> Hi Stephan,
> 
> > Hi Herbert,
> > 
> > I am currently working on the template for SP800-38F key wrapping. The
> > module is operational and calculates what I want.
> > 
> > However, I have one problem I am having difficulties to track down and I
> > am
> > wondering whether you could point me to the right direction.
> > 
> > When a caller calls
> > 
> > 	crypto_alloc_aead("kw(aes)", 0, 0);
> > 
> > somehow the refcount of the kernel module implementing the keywrapping is
> > not increased. Once can see that in lsmod where the "Used by" value
> > remains
> > 0.
> > 
> > Then when the caller deallocates the cipher handle, the refcount is -1
> > according to lsmod. With that, a second invocation of crypto_alloc_aead
> > will fail and I even cannot remove the module from the kernel.
> > 
> > Who increases the refcount on the kernel crypto API side?
> 
> I think I hit an even bigger problem: while playing with other AEAD ciphers,
> I see the same thing now:
> 
> $ lsmod
> Module                  Size  Used by
> ansi_cprng             12989  0
> drbg                   30255  0
> algif_rng              12753  0
> seqiv                  13003  -1
> ccm                    17731  -1
> gcm                    23371  -1
> 
> Allocation of these ciphers fail.

After updating to the current cryptodev-2.6 tree from today, this issue 
vanished.

Sorry for the noise, please disregard the thread.
> 
> > Thanks a lot


-- 
Ciao
Stephan