[PATCH AUTOSEL 6.11 053/244] nvme-tcp: check for invalidated or revoked key

Sasha Levin
2024-09-25T11:38:31Z

From: Hannes Reinecke <hare@kernel.org>

[ Upstream commit 5bc46b49c828a6dfaab80b71ecb63fe76a1096d2 ]

key_lookup() will always return a key, even if that key is revoked
or invalidated. So check for invalid keys before continuing.

Signed-off-by: Hannes Reinecke <hare@kernel.org>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/nvme/common/keyring.c | 22 ++++++++++++++++++++++
drivers/nvme/host/Kconfig | 1 +
drivers/nvme/host/fabrics.c | 2 +-
drivers/nvme/host/tcp.c | 2 +-
include/linux/nvme-keyring.h | 6 +++++-
5 files changed, 30 insertions(+), 3 deletions(-)

diff --git a/drivers/nvme/common/keyring.c b/drivers/nvme/common/keyring.c
index 05e89307c8aa3..ed5167f942d89 100644
--- a/drivers/nvme/common/keyring.c
+++ b/drivers/nvme/common/keyring.c
@@ -20,6 +20,28 @@ key_serial_t nvme_keyring_id(void)
}
EXPORT_SYMBOL_GPL(nvme_keyring_id);

+static bool nvme_tls_psk_revoked(struct key *psk)
+{
+ return test_bit(KEY_FLAG_REVOKED, &psk->flags) ||
+ test_bit(KEY_FLAG_INVALIDATED, &psk->flags);
+}
+
+struct key *nvme_tls_key_lookup(key_serial_t key_id)
+{
+ struct key *key = key_lookup(key_id);
+
+ if (IS_ERR(key)) {
+ pr_err("key id %08x not found\n", key_id);
+ return key;
+ }
+ if (nvme_tls_psk_revoked(key)) {
+ pr_err("key id %08x revoked\n", key_id);
+ return ERR_PTR(-EKEYREVOKED);
+ }
+ return key;
+}
+EXPORT_SYMBOL_GPL(nvme_tls_key_lookup);
+
static void nvme_tls_psk_describe(const struct key *key, struct seq_file *m)
{
seq_puts(m, key->description);
diff --git a/drivers/nvme/host/Kconfig b/drivers/nvme/host/Kconfig
index a3caef75aa0a8..883aaab2d83e3 100644
--- a/drivers/nvme/host/Kconfig
+++ b/drivers/nvme/host/Kconfig
@@ -109,6 +109,7 @@ config NVME_HOST_AUTH
bool "NVMe over Fabrics In-Band Authentication in host side"
depends on NVME_CORE
select NVME_AUTH
+ select NVME_KEYRING if NVME_TCP_TLS
help
This provides support for NVMe over Fabrics In-Band Authentication in
host side.
diff --git a/drivers/nvme/host/fabrics.c b/drivers/nvme/host/fabrics.c
index f5f545fa01035..432efcbf9e2f5 100644
--- a/drivers/nvme/host/fabrics.c
+++ b/drivers/nvme/host/fabrics.c
@@ -665,7 +665,7 @@ static struct key *nvmf_parse_key(int key_id)
return ERR_PTR(-EINVAL);
}

- key = key_lookup(key_id);
+ key = nvme_tls_key_lookup(key_id);
if (IS_ERR(key))
pr_err("key id %08x not found\n", key_id);
else
diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c
index b305873e588e6..e3d82e91151af 100644
--- a/drivers/nvme/host/tcp.c
+++ b/drivers/nvme/host/tcp.c
@@ -1596,7 +1596,7 @@ static void nvme_tcp_tls_done(void *data, int status, key_serial_t pskid)
goto out_complete;
}

- tls_key = key_lookup(pskid);
+ tls_key = nvme_tls_key_lookup(pskid);
if (IS_ERR(tls_key)) {
dev_warn(ctrl->ctrl.device, "queue %d: Invalid key %x\n",
qid, pskid);
diff --git a/include/linux/nvme-keyring.h b/include/linux/nvme-keyring.h
index e10333d78dbbe..19d2b256180fd 100644
--- a/include/linux/nvme-keyring.h
+++ b/include/linux/nvme-keyring.h
@@ -12,7 +12,7 @@ key_serial_t nvme_tls_psk_default(struct key *keyring,
const char *hostnqn, const char *subnqn);

key_serial_t nvme_keyring_id(void);
-
+struct key *nvme_tls_key_lookup(key_serial_t key_id);
#else

static inline key_serial_t nvme_tls_psk_default(struct key *keyring,
@@ -24,5 +24,9 @@ static inline key_serial_t nvme_keyring_id(void)
{
return 0;
}
+static inline struct key *nvme_tls_key_lookup(key_serial_t key_id)
+{
+ return ERR_PTR(-ENOTSUPP);
+}
#endif /* !CONFIG_NVME_KEYRING */
#endif /* _NVME_KEYRING_H */
--
2.43.0