linux-kernel - Re: [PATCH v3 1/3] nvme-auth: alloc nvme_dhchap

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Date:   Tue, 17 Oct 2023 08:05:16 +0200
From:   Hannes Reinecke <hare@...e.de>
To:     Mark O'Donovan <shiftee@...teo.net>, linux-kernel@...r.kernel.org
Cc:     linux-nvme@...ts.infradead.org, sagi@...mberg.me, hch@....de,
        axboe@...nel.dk, kbusch@...nel.org,
        Akash Appaiah <Akash.Appaiah@...l.com>
Subject: Re: [PATCH v3 1/3] nvme-auth: alloc nvme_dhchap_key as single buffer

On 10/17/23 00:58, Mark O'Donovan wrote:
> Co-developed-by: Akash Appaiah <Akash.Appaiah@...l.com>
> Signed-off-by: Akash Appaiah <Akash.Appaiah@...l.com>
> Signed-off-by: Mark O'Donovan <shiftee@...teo.net>
> ---
>   drivers/nvme/common/auth.c | 26 +++++++++++++++-----------
>   include/linux/nvme-auth.h  |  3 ++-
>   2 files changed, 17 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/nvme/common/auth.c b/drivers/nvme/common/auth.c
> index d90e4f0c08b7..225fc474e34a 100644
> --- a/drivers/nvme/common/auth.c
> +++ b/drivers/nvme/common/auth.c
> @@ -163,14 +163,9 @@ struct nvme_dhchap_key *nvme_auth_extract_key(unsigned char *secret,
>   	p = strrchr(secret, ':');
>   	if (p)
>   		allocated_len = p - secret;
> -	key = kzalloc(sizeof(*key), GFP_KERNEL);
> +	key = nvme_auth_alloc_key(allocated_len, 0);
>   	if (!key)
>   		return ERR_PTR(-ENOMEM);
> -	key->key = kzalloc(allocated_len, GFP_KERNEL);
> -	if (!key->key) {
> -		ret = -ENOMEM;
> -		goto out_free_key;
> -	}
>   
>   	key_len = base64_decode(secret, allocated_len, key->key);
>   	if (key_len < 0) {
> @@ -213,19 +208,28 @@ struct nvme_dhchap_key *nvme_auth_extract_key(unsigned char *secret,
>   	key->hash = key_hash;
>   	return key;
>   out_free_secret:
> -	kfree_sensitive(key->key);
> -out_free_key:
> -	kfree(key);
> +	nvme_auth_free_key(key);
>   	return ERR_PTR(ret);
>   }
>   EXPORT_SYMBOL_GPL(nvme_auth_extract_key);
>   
> +struct nvme_dhchap_key *nvme_auth_alloc_key(u32 len, u8 hash)
> +{
> +	struct nvme_dhchap_key *key = kzalloc(len + sizeof(*key), GFP_KERNEL);
> +
> +	if (key) {
> +		key->len = len;
> +		key->hash = hash;
> +	}
> +	return key;
> +}
> +EXPORT_SYMBOL_GPL(nvme_auth_alloc_key);
> +
>   void nvme_auth_free_key(struct nvme_dhchap_key *key)
>   {
>   	if (!key)
>   		return;
> -	kfree_sensitive(key->key);
> -	kfree(key);
> +	kfree_sensitive(key);
>   }
>   EXPORT_SYMBOL_GPL(nvme_auth_free_key);
>   
> diff --git a/include/linux/nvme-auth.h b/include/linux/nvme-auth.h
> index dcb8030062dd..df96940be930 100644
> --- a/include/linux/nvme-auth.h
> +++ b/include/linux/nvme-auth.h
> @@ -9,9 +9,9 @@
>   #include <crypto/kpp.h>
>   
>   struct nvme_dhchap_key {
> -	u8 *key;
>   	size_t len;
>   	u8 hash;
> +	u8 key[];
>   };
>   
>   u32 nvme_auth_get_seqnum(void);
> @@ -27,6 +27,7 @@ u8 nvme_auth_hmac_id(const char *hmac_name);
>   struct nvme_dhchap_key *nvme_auth_extract_key(unsigned char *secret,
>   					      u8 key_hash);
>   void nvme_auth_free_key(struct nvme_dhchap_key *key);
> +struct nvme_dhchap_key *nvme_auth_alloc_key(u32 len, u8 hash);
>   u8 *nvme_auth_transform_key(struct nvme_dhchap_key *key, char *nqn);
>   int nvme_auth_generate_key(u8 *secret, struct nvme_dhchap_key **ret_key);
>   int nvme_auth_augmented_challenge(u8 hmac_id, u8 *skey, size_t skey_len,
Good idea.

Reviewed-by: Hannes Reinecke <hare@...e.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                Kernel Storage Architect
hare@...e.de                              +49 911 74053 688
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