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Message-Id: <20230816120608.37135-2-hare@suse.de>
Date: Wed, 16 Aug 2023 14:05:51 +0200
From: Hannes Reinecke <hare@...e.de>
To: Christoph Hellwig <hch@....de>
Cc: Sagi Grimberg <sagi@...mberg.me>,
Keith Busch <kbusch@...nel.org>,
linux-nvme@...ts.infradead.org,
Jakub Kicinski <kuba@...nel.org>,
Eric Dumazet <edumazet@...gle.com>,
Paolo Abeni <pabeni@...hat.com>,
netdev@...r.kernel.org,
Hannes Reinecke <hare@...e.de>
Subject: [PATCH 01/18] nvme-keyring: register '.nvme' keyring
Register a '.nvme' keyring to hold keys for TLS and DH-HMAC-CHAP and
add a new config option NVME_KEYRING.
We need a separate keyring for NVMe as the configuration is done
via individual commands (eg for configfs), and the usual per-session
or per-process keyrings can't be used.
Signed-off-by: Hannes Reinecke <hare@...e.de>
Reviewed-by: Sagi Grimberg <sagi@...mberg.me>
---
drivers/nvme/common/Kconfig | 4 ++++
drivers/nvme/common/Makefile | 3 ++-
drivers/nvme/common/keyring.c | 40 +++++++++++++++++++++++++++++++++++
drivers/nvme/host/core.c | 10 +++++++--
include/linux/nvme-keyring.h | 28 ++++++++++++++++++++++++
5 files changed, 82 insertions(+), 3 deletions(-)
create mode 100644 drivers/nvme/common/keyring.c
create mode 100644 include/linux/nvme-keyring.h
diff --git a/drivers/nvme/common/Kconfig b/drivers/nvme/common/Kconfig
index 4514f44362dd..641b27adb047 100644
--- a/drivers/nvme/common/Kconfig
+++ b/drivers/nvme/common/Kconfig
@@ -2,3 +2,7 @@
config NVME_COMMON
tristate
+
+config NVME_KEYRING
+ bool
+ select KEYS
diff --git a/drivers/nvme/common/Makefile b/drivers/nvme/common/Makefile
index 720c625b8a52..0cbd0b0b8d49 100644
--- a/drivers/nvme/common/Makefile
+++ b/drivers/nvme/common/Makefile
@@ -4,4 +4,5 @@ ccflags-y += -I$(src)
obj-$(CONFIG_NVME_COMMON) += nvme-common.o
-nvme-common-y += auth.o
+nvme-common-$(CONFIG_NVME_AUTH) += auth.o
+nvme-common-$(CONFIG_NVME_KEYRING) += keyring.o
diff --git a/drivers/nvme/common/keyring.c b/drivers/nvme/common/keyring.c
new file mode 100644
index 000000000000..5cf64b278119
--- /dev/null
+++ b/drivers/nvme/common/keyring.c
@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2023 Hannes Reinecke, SUSE Labs
+ */
+
+#include <linux/module.h>
+#include <linux/seq_file.h>
+#include <linux/key-type.h>
+#include <keys/user-type.h>
+#include <linux/nvme.h>
+
+static struct key *nvme_keyring;
+
+key_serial_t nvme_keyring_id(void)
+{
+ return nvme_keyring->serial;
+}
+EXPORT_SYMBOL_GPL(nvme_keyring_id);
+
+int nvme_keyring_init(void)
+{
+ nvme_keyring = keyring_alloc(".nvme",
+ GLOBAL_ROOT_UID, GLOBAL_ROOT_GID,
+ current_cred(),
+ (KEY_POS_ALL & ~KEY_POS_SETATTR) |
+ (KEY_USR_ALL & ~KEY_USR_SETATTR),
+ KEY_ALLOC_NOT_IN_QUOTA, NULL, NULL);
+ if (IS_ERR(nvme_keyring))
+ return PTR_ERR(nvme_keyring);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(nvme_keyring_init);
+
+void nvme_keyring_exit(void)
+{
+ key_revoke(nvme_keyring);
+ key_put(nvme_keyring);
+}
+EXPORT_SYMBOL_GPL(nvme_keyring_exit);
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 37b6fa746662..dfc574d0f18d 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -25,6 +25,7 @@
#include "nvme.h"
#include "fabrics.h"
#include <linux/nvme-auth.h>
+#include <linux/nvme-keyring.h>
#define CREATE_TRACE_POINTS
#include "trace.h"
@@ -4703,12 +4704,16 @@ static int __init nvme_core_init(void)
result = PTR_ERR(nvme_ns_chr_class);
goto unregister_generic_ns;
}
-
- result = nvme_init_auth();
+ result = nvme_keyring_init();
if (result)
goto destroy_ns_chr;
+ result = nvme_init_auth();
+ if (result)
+ goto keyring_exit;
return 0;
+keyring_exit:
+ nvme_keyring_exit();
destroy_ns_chr:
class_destroy(nvme_ns_chr_class);
unregister_generic_ns:
@@ -4732,6 +4737,7 @@ static int __init nvme_core_init(void)
static void __exit nvme_core_exit(void)
{
nvme_exit_auth();
+ nvme_keyring_exit();
class_destroy(nvme_ns_chr_class);
class_destroy(nvme_subsys_class);
class_destroy(nvme_class);
diff --git a/include/linux/nvme-keyring.h b/include/linux/nvme-keyring.h
new file mode 100644
index 000000000000..32bd264a71e6
--- /dev/null
+++ b/include/linux/nvme-keyring.h
@@ -0,0 +1,28 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2023 Hannes Reinecke, SUSE Labs
+ */
+
+#ifndef _NVME_KEYRING_H
+#define _NVME_KEYRING_H
+
+#ifdef CONFIG_NVME_KEYRING
+
+key_serial_t nvme_keyring_id(void);
+int nvme_keyring_init(void);
+void nvme_keyring_exit(void);
+
+#else
+
+static inline key_serial_t nvme_keyring_id(void)
+{
+ return 0;
+}
+static inline int nvme_keyring_init(void)
+{
+ return 0;
+}
+static inline void nvme_keyring_exit(void) {}
+
+#endif /* !CONFIG_NVME_KEYRING */
+#endif /* _NVME_KEYRING_H */
--
2.35.3
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