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Tue, 17 Oct 2023 12:53:07 +0200 (CEST) From: Mark O'Donovan To: linux-kernel@vger.kernel.org Cc: linux-nvme@lists.infradead.org, sagi@grimberg.me, hch@lst.de, axboe@kernel.dk, kbusch@kernel.org, hare@suse.de, Mark O'Donovan , Akash Appaiah Subject: [PATCH v4 1/3] nvme-auth: alloc nvme_dhchap_key as single buffer Date: Tue, 17 Oct 2023 10:52:49 +0000 Message-Id: <20231017105251.3274652-2-shiftee@posteo.net> In-Reply-To: <20231017105251.3274652-1-shiftee@posteo.net> References: <20231017105251.3274652-1-shiftee@posteo.net> MIME-Version: 1.0 X-Spam-Status: No, score=-0.8 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on pete.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (pete.vger.email [0.0.0.0]); Tue, 17 Oct 2023 03:53:25 -0700 (PDT) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1779999715115453899 X-GMAIL-MSGID: 1779999715115453899 Co-developed-by: Akash Appaiah Signed-off-by: Akash Appaiah Signed-off-by: Mark O'Donovan Reviewed-by: Hannes Reinecke --- V2 -> V3: initial version V3 -> V4: added function to get size of key struct drivers/nvme/common/auth.c | 35 ++++++++++++++++++++++++----------- include/linux/nvme-auth.h | 4 +++- 2 files changed, 27 insertions(+), 12 deletions(-) diff --git a/drivers/nvme/common/auth.c b/drivers/nvme/common/auth.c index d90e4f0c08b7..984f4320aca3 100644 --- a/drivers/nvme/common/auth.c +++ b/drivers/nvme/common/auth.c @@ -150,6 +150,14 @@ size_t nvme_auth_hmac_hash_len(u8 hmac_id) } EXPORT_SYMBOL_GPL(nvme_auth_hmac_hash_len); +u32 nvme_auth_key_struct_size(u32 key_len) +{ + struct nvme_dhchap_key key; + + return struct_size(&key, key, key_len); +} +EXPORT_SYMBOL_GPL(nvme_auth_key_struct_size); + struct nvme_dhchap_key *nvme_auth_extract_key(unsigned char *secret, u8 key_hash) { @@ -163,14 +171,9 @@ 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 +216,29 @@ 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) +{ + u32 num_bytes = nvme_auth_key_struct_size(len); + struct nvme_dhchap_key *key = kzalloc(num_bytes, 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..a5ae9abe1ef6 100644 --- a/include/linux/nvme-auth.h +++ b/include/linux/nvme-auth.h @@ -9,9 +9,9 @@ #include struct nvme_dhchap_key { - u8 *key; size_t len; u8 hash; + u8 key[]; }; u32 nvme_auth_get_seqnum(void); @@ -24,9 +24,11 @@ const char *nvme_auth_digest_name(u8 hmac_id); size_t nvme_auth_hmac_hash_len(u8 hmac_id); u8 nvme_auth_hmac_id(const char *hmac_name); +u32 nvme_auth_key_struct_size(u32 key_len); 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,