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

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Date:	Wed, 30 Mar 2016 17:31:46 +0100
From:	David Howells <dhowells@...hat.com>
To:	Tadeusz Struk <tadeusz.struk@...el.com>
Cc:	dhowells@...hat.com, 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

Tadeusz Struk <tadeusz.struk@...el.com> 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.

David