linux-kernel - Re: [PATCH v1.5 5/5] keys: add new key-type encrypted

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Date:	Fri, 03 Dec 2010 13:42:05 +0000
From:	David Howells <dhowells@...hat.com>
To:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
Cc:	dhowells@...hat.com, linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org, keyrings@...ux-nfs.org,
	linux-crypto@...r.kernel.org,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	James Morris <jmorris@...ei.org>,
	David Safford <safford@...son.ibm.com>,
	Rajiv Andrade <srajiv@...ux.vnet.ibm.com>
Subject: Re: [PATCH v1.5 5/5] keys: add new key-type encrypted

Mimi Zohar <zohar@...ux.vnet.ibm.com> wrote:

> +#define KEY_TRUSTED_PREFIX "trusted:"
> +#define KEY_TRUSTED_PREFIX_LEN (sizeof (KEY_TRUSTED_PREFIX) - 1)
> +#define KEY_USER_PREFIX "user:"
> +#define KEY_USER_PREFIX_LEN (sizeof (KEY_USER_PREFIX) - 1)

I'd recommend using static const char arrays.

> +static int datablob_parse(char *datablob, char **master_desc,
> ...
> +		*hex_encoded_data = *hex_encoded_iv + (2 * ivsize) + 2;

Do you need to validate the length of the string here?

> +static struct key *request_trusted_key(const char *trusted_desc,
> +				       u8 **master_key,
> +				       unsigned int *master_keylen)

You need to annotate the function with an __acquires() to indicate that it
returns with a lock held for Sparse checking.  I think you should be able to
do:

	__acquires(tkey->sem)

on the line before the '{'.

> +static struct key *request_user_key(const char *master_desc, u8 **master_key,
> +				    unsigned int *master_keylen)

Ditto.

> +static struct sdesc *init_sdesc(struct crypto_shash *alg)
> +{
> +	struct sdesc *sdesc;
> +	int size;
> +
> +	size = sizeof(struct shash_desc) + crypto_shash_descsize(alg);
> +	sdesc = kmalloc(size, GFP_KERNEL);

I think I'd call it alloc_sdesc() rather than init_sdesc().

> +static int calc_hmac(u8 *digest, const u8 *key, const unsigned int keylen,
> +		     const u8 *buf, const unsigned int buflen)

size_t not 'const unsigned int' please.  There are multiple of these within
the patch.

> +	sg_set_buf(&sg_out[0], epayload->decrypted_data,
> +		   (unsigned int)epayload->decrypted_datalen);

Superfluous cast.

David
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