linux-kernel - Re: [PATCH v3 7/7] crypto: AF_ALG

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Date:	Wed, 30 Mar 2016 10:19:43 -0700
From:	Tadeusz Struk <tadeusz.struk@...el.com>
To:	David Howells <dhowells@...hat.com>
Cc:	herbert@...dor.apana.org.au, smueller@...onox.de,
	linux-api@...r.kernel.org, marcel@...tmann.org,
	linux-kernel@...r.kernel.org, keyrings@...r.kernel.org,
	linux-crypto@...r.kernel.org, dwmw2@...radead.org,
	davem@...emloft.net
Subject: Re: [PATCH v3 7/7] crypto: AF_ALG - add support for key_id

Hi David,
On 03/30/2016 09:31 AM, David Howells wrote:
>> +	keyring = request_key(&key_type_asymmetric, key_name, NULL);
>> > +
>> > +	err = -ENOKEY;
>> > +	if (IS_ERR(keyring))
>> > +		goto out;
>> > +
>> > +	pkey = keyring->payload.data[asym_crypto];
> NAK.  This is liable to crash in future.  You may not assume that you know
> what keyring->payload.data[asym_crypto] points to.
> 
> You may not use struct public_key outside of crypto/asymmetric_key/.  It's the
> internal data of the software subtype.  I'll move it out of the global header
> to remove the temptation;-).
> 
> You must use accessor functions such as verify_signature().  Feel free to add
> further accessor functions such as query_asym_capabilities(),
> create_signature(), encrypt_blob() and decrypt_blob() or something like that.

Thanks for your response. I thought that the public_key_query_sw_key(pkey)
check was enough for now.
I'll remove public_key stuff from af_alg and add the accessors.
Thanks,
-- 
TS