@@ -1,3 +1,4 @@
obj-$(CONFIG_ACPI_NFIT) := nfit.o
nfit-y := core.o
+nfit-$(CONFIG_X86) += intel.o
nfit-$(CONFIG_X86_MCE) += mce.o
@@ -1910,7 +1910,8 @@ static int acpi_nfit_register_dimms(struct acpi_nfit_desc *acpi_desc)
nvdimm = nvdimm_create(acpi_desc->nvdimm_bus, nfit_mem,
acpi_nfit_dimm_attribute_groups,
flags, cmd_mask, flush ? flush->hint_count : 0,
- nfit_mem->flush_wpq, nfit_mem->id);
+ nfit_mem->flush_wpq, nfit_mem->id,
+ acpi_nfit_get_security_ops(nfit_mem->family));
if (!nvdimm)
return -ENOMEM;
new file mode 100644
@@ -0,0 +1,151 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright(c) 2018 Intel Corporation. All rights reserved. */
+/*
+ * Intel specific NFIT ops
+ */
+#include <linux/libnvdimm.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/ndctl.h>
+#include <linux/sysfs.h>
+#include <linux/delay.h>
+#include <linux/acpi.h>
+#include <linux/io.h>
+#include <linux/nd.h>
+#include <asm/cacheflush.h>
+#include <asm/smp.h>
+#include <acpi/nfit.h>
+#include "intel.h"
+#include "nfit.h"
+
+static int intel_dimm_security_unlock(struct nvdimm_bus *nvdimm_bus,
+ struct nvdimm *nvdimm, struct nvdimm_key_data *nkey)
+{
+ struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
+ int cmd_rc, rc = 0;
+ struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
+ struct {
+ struct nd_cmd_pkg pkg;
+ struct nd_intel_unlock_unit cmd;
+ } nd_cmd = {
+ .pkg = {
+ .nd_command = NVDIMM_INTEL_UNLOCK_UNIT,
+ .nd_family = NVDIMM_FAMILY_INTEL,
+ .nd_size_in = ND_INTEL_PASSPHRASE_SIZE,
+ .nd_size_out = ND_INTEL_STATUS_SIZE,
+ .nd_fw_size = ND_INTEL_STATUS_SIZE,
+ },
+ .cmd = {
+ .status = 0,
+ },
+ };
+
+ if (!test_bit(NVDIMM_INTEL_UNLOCK_UNIT, &nfit_mem->dsm_mask))
+ return -ENOTTY;
+
+ memcpy(nd_cmd.cmd.passphrase, nkey->data, ND_INTEL_PASSPHRASE_SIZE);
+ rc = nd_desc->ndctl(nd_desc, nvdimm, ND_CMD_CALL, &nd_cmd,
+ sizeof(nd_cmd), &cmd_rc);
+ if (rc < 0)
+ goto out;
+ if (cmd_rc < 0) {
+ rc = cmd_rc;
+ goto out;
+ }
+
+ switch (nd_cmd.cmd.status) {
+ case 0:
+ break;
+ case ND_INTEL_STATUS_INVALID_PASS:
+ rc = -EINVAL;
+ goto out;
+ case ND_INTEL_STATUS_INVALID_STATE:
+ default:
+ rc = -ENXIO;
+ goto out;
+ }
+
+ /*
+ * TODO: define a cross arch wbinvd when/if NVDIMM_FAMILY_INTEL
+ * support arrives on another arch.
+ */
+ /* DIMM unlocked, invalidate all CPU caches before we read it */
+ wbinvd_on_all_cpus();
+
+ out:
+ return rc;
+}
+
+static int intel_dimm_security_state(struct nvdimm_bus *nvdimm_bus,
+ struct nvdimm *nvdimm, enum nvdimm_security_state *state)
+{
+ struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
+ int cmd_rc, rc = 0;
+ struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
+ struct {
+ struct nd_cmd_pkg pkg;
+ struct nd_intel_get_security_state cmd;
+ } nd_cmd = {
+ .pkg = {
+ .nd_command = NVDIMM_INTEL_GET_SECURITY_STATE,
+ .nd_family = NVDIMM_FAMILY_INTEL,
+ .nd_size_in = 0,
+ .nd_size_out =
+ sizeof(struct nd_intel_get_security_state),
+ .nd_fw_size =
+ sizeof(struct nd_intel_get_security_state),
+ },
+ .cmd = {
+ .status = 0,
+ .state = 0,
+ },
+ };
+
+ if (!test_bit(NVDIMM_INTEL_GET_SECURITY_STATE, &nfit_mem->dsm_mask)) {
+ *state = NVDIMM_SECURITY_UNSUPPORTED;
+ return 0;
+ }
+
+ *state = NVDIMM_SECURITY_DISABLED;
+ rc = nd_desc->ndctl(nd_desc, nvdimm, ND_CMD_CALL, &nd_cmd,
+ sizeof(nd_cmd), &cmd_rc);
+ if (rc < 0)
+ goto out;
+ if (cmd_rc < 0) {
+ rc = cmd_rc;
+ goto out;
+ }
+
+ switch (nd_cmd.cmd.status) {
+ case 0:
+ break;
+ case ND_INTEL_STATUS_RETRY:
+ rc = -EAGAIN;
+ goto out;
+ case ND_INTEL_STATUS_NOT_READY:
+ default:
+ rc = -ENXIO;
+ goto out;
+ }
+
+ /* check and see if security is enabled and locked */
+ if (nd_cmd.cmd.state & ND_INTEL_SEC_STATE_UNSUPPORTED)
+ *state = NVDIMM_SECURITY_UNSUPPORTED;
+ else if (nd_cmd.cmd.state & ND_INTEL_SEC_STATE_ENABLED) {
+ if (nd_cmd.cmd.state & ND_INTEL_SEC_STATE_LOCKED)
+ *state = NVDIMM_SECURITY_LOCKED;
+ else
+ *state = NVDIMM_SECURITY_UNLOCKED;
+ } else
+ *state = NVDIMM_SECURITY_DISABLED;
+
+ out:
+ if (rc < 0)
+ *state = NVDIMM_SECURITY_INVALID;
+ return rc;
+}
+
+struct nvdimm_security_ops intel_security_ops = {
+ .state = intel_dimm_security_state,
+ .unlock = intel_dimm_security_unlock,
+};
@@ -8,6 +8,8 @@
#ifdef CONFIG_X86
+extern struct nvdimm_security_ops intel_security_ops;
+
#define ND_INTEL_STATUS_SIZE 4
#define ND_INTEL_PASSPHRASE_SIZE 32
@@ -62,6 +64,20 @@ struct nd_intel_overwrite {
struct nd_intel_query_overwrite {
u32 status;
} __packed;
+
#endif /* CONFIG_X86 */
+static inline struct nvdimm_security_ops *
+acpi_nfit_get_security_ops(int family)
+{
+ switch (family) {
+#ifdef CONFIG_X86
+ case NVDIMM_FAMILY_INTEL:
+ return &intel_security_ops;
+#endif
+ default:
+ return NULL;
+ }
+}
+
#endif
@@ -51,6 +51,13 @@ static int nvdimm_probe(struct device *dev)
get_device(dev);
kref_init(&ndd->kref);
+ nvdimm_security_get_state(dev);
+
+ /* unlock DIMM here before touch label */
+ rc = nvdimm_security_unlock_dimm(dev);
+ if (rc < 0)
+ dev_warn(dev, "failed to unlock dimm %s\n", dev_name(dev));
+
/*
* EACCES failures reading the namespace label-area-properties
* are interpreted as the DIMM capacity being locked but the
@@ -67,6 +67,110 @@ static void nvdimm_key_destroy(struct key *key)
kfree(key->payload.data[0]);
}
+/*
+ * Find key in kernel keyring
+ */
+static struct key *nvdimm_search_key(struct device *dev)
+{
+ struct nvdimm *nvdimm = to_nvdimm(dev);
+ char *desc;
+ key_ref_t keyref;
+ struct key *key = NULL;
+
+ if (!nvdimm->security_ops)
+ return NULL;
+
+ desc = kzalloc(NVDIMM_KEY_DESC_LEN, GFP_KERNEL);
+ if (!desc)
+ return NULL;
+
+ keyref = keyring_search(make_key_ref(nvdimm_cred->thread_keyring, 1),
+ &nvdimm_key_type, nvdimm->dimm_id);
+ if (IS_ERR(keyref))
+ key = NULL;
+ else
+ key = key_ref_to_ptr(keyref);
+
+ kfree(desc);
+ return key;
+}
+
+/*
+ * Retrieve kernel key for DIMM and request from user space if necessary.
+ */
+static struct key *nvdimm_request_key(struct device *dev)
+{
+ struct nvdimm *nvdimm = to_nvdimm(dev);
+ struct key *key = NULL;
+
+ if (!nvdimm->security_ops)
+ return NULL;
+
+ key = request_key(&nvdimm_key_type, nvdimm->dimm_id, nvdimm->dimm_id);
+ if (IS_ERR(key))
+ key = NULL;
+
+ return key;
+}
+
+int nvdimm_security_get_state(struct device *dev)
+{
+ struct nvdimm *nvdimm = to_nvdimm(dev);
+ struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
+
+ if (!nvdimm->security_ops)
+ return 0;
+
+ return nvdimm->security_ops->state(nvdimm_bus, nvdimm,
+ &nvdimm->state);
+}
+
+int nvdimm_security_unlock_dimm(struct device *dev)
+{
+ struct nvdimm *nvdimm = to_nvdimm(dev);
+ struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
+ struct key *key;
+ int rc;
+ void *payload;
+ bool cached_key = false;
+
+ if (!nvdimm->security_ops)
+ return 0;
+
+ if (nvdimm->state == NVDIMM_SECURITY_UNLOCKED ||
+ nvdimm->state == NVDIMM_SECURITY_UNSUPPORTED ||
+ nvdimm->state == NVDIMM_SECURITY_DISABLED)
+ return 0;
+
+ key = nvdimm_search_key(dev);
+ if (!key)
+ key = nvdimm_request_key(dev);
+ else
+ cached_key = true;
+ if (!key)
+ return -ENXIO;
+
+ dev_dbg(dev, "%s: key: %#x\n", __func__, key->serial);
+ down_read(&key->sem);
+ payload = key->payload.data[0];
+ rc = nvdimm->security_ops->unlock(nvdimm_bus, nvdimm, payload);
+ up_read(&key->sem);
+
+ if (rc == 0) {
+ if (!cached_key)
+ key_link(nvdimm_cred->thread_keyring, key);
+ nvdimm->state = NVDIMM_SECURITY_UNLOCKED;
+ dev_info(dev, "DIMM %s unlocked\n", dev_name(dev));
+ } else {
+ key_invalidate(key);
+ dev_warn(dev, "Failed to unlock dimm: %s\n", dev_name(dev));
+ }
+
+ key_put(key);
+ nvdimm_security_get_state(dev);
+ return rc;
+}
+
/*
* Retrieve bus and dimm handle and return if this bus supports
* get_config_data commands
@@ -440,7 +544,8 @@ EXPORT_SYMBOL_GPL(nvdimm_attribute_group);
struct nvdimm *nvdimm_create(struct nvdimm_bus *nvdimm_bus, void *provider_data,
const struct attribute_group **groups, unsigned long flags,
unsigned long cmd_mask, int num_flush,
- struct resource *flush_wpq, const char *id)
+ struct resource *flush_wpq, const char *id,
+ struct nvdimm_security_ops *sec_ops)
{
struct nvdimm *nvdimm = kzalloc(sizeof(*nvdimm), GFP_KERNEL);
struct device *dev;
@@ -455,6 +560,7 @@ struct nvdimm *nvdimm_create(struct nvdimm_bus *nvdimm_bus, void *provider_data,
}
memcpy(nvdimm->dimm_id, id, NVDIMM_KEY_DESC_LEN);
+ nvdimm->security_ops = sec_ops;
nvdimm->provider_data = provider_data;
nvdimm->flags = flags;
nvdimm->cmd_mask = cmd_mask;
@@ -43,6 +43,8 @@ struct nvdimm {
int id, num_flush;
struct resource *flush_wpq;
char dimm_id[NVDIMM_KEY_DESC_LEN];
+ struct nvdimm_security_ops *security_ops;
+ enum nvdimm_security_state state;
};
/**
@@ -424,4 +424,6 @@ static inline bool is_bad_pmem(struct badblocks *bb, sector_t sector,
resource_size_t nd_namespace_blk_validate(struct nd_namespace_blk *nsblk);
const u8 *nd_dev_to_uuid(struct device *dev);
bool pmem_should_map_pages(struct device *dev);
+int nvdimm_security_unlock_dimm(struct device *dev);
+int nvdimm_security_get_state(struct device *dev);
#endif /* __ND_H__ */
@@ -157,9 +157,29 @@ static inline struct nd_blk_region_desc *to_blk_region_desc(
extern struct key_type nvdimm_key_type;
+enum nvdimm_security_state {
+ NVDIMM_SECURITY_INVALID = 0,
+ NVDIMM_SECURITY_DISABLED,
+ NVDIMM_SECURITY_UNLOCKED,
+ NVDIMM_SECURITY_LOCKED,
+ NVDIMM_SECURITY_UNSUPPORTED,
+};
+
#define NVDIMM_PASSPHRASE_LEN 32
#define NVDIMM_KEY_DESC_LEN 25
+struct nvdimm_key_data {
+ u8 data[NVDIMM_PASSPHRASE_LEN];
+};
+
+struct nvdimm_security_ops {
+ int (*state)(struct nvdimm_bus *nvdimm_bus,
+ struct nvdimm *nvdimm,
+ enum nvdimm_security_state *state);
+ int (*unlock)(struct nvdimm_bus *nvdimm_bus,
+ struct nvdimm *nvdimm, struct nvdimm_key_data *nkey);
+};
+
void badrange_init(struct badrange *badrange);
int badrange_add(struct badrange *badrange, u64 addr, u64 length);
void badrange_forget(struct badrange *badrange, phys_addr_t start,
@@ -183,7 +203,8 @@ void *nvdimm_provider_data(struct nvdimm *nvdimm);
struct nvdimm *nvdimm_create(struct nvdimm_bus *nvdimm_bus, void *provider_data,
const struct attribute_group **groups, unsigned long flags,
unsigned long cmd_mask, int num_flush,
- struct resource *flush_wpq, const char *dimm_id);
+ struct resource *flush_wpq, const char *dimm_id,
+ struct nvdimm_security_ops *sec_ops);
const struct nd_cmd_desc *nd_cmd_dimm_desc(int cmd);
const struct nd_cmd_desc *nd_cmd_bus_desc(int cmd);
u32 nd_cmd_in_size(struct nvdimm *nvdimm, int cmd,
Add support to allow query the security status of the Intel nvdimms and also unlock the dimm via the kernel key management APIs. The passphrase is expected to be pulled from userspace through keyutils. Moving the Intel related bits to its own source file as well. Signed-off-by: Dave Jiang <dave.jiang@intel.com> --- drivers/acpi/nfit/Makefile | 1 drivers/acpi/nfit/core.c | 3 + drivers/acpi/nfit/intel.c | 151 ++++++++++++++++++++++++++++++++++++++++++++ drivers/acpi/nfit/intel.h | 16 +++++ drivers/nvdimm/dimm.c | 7 ++ drivers/nvdimm/dimm_devs.c | 108 +++++++++++++++++++++++++++++++ drivers/nvdimm/nd-core.h | 2 + drivers/nvdimm/nd.h | 2 + include/linux/libnvdimm.h | 23 ++++++- 9 files changed, 310 insertions(+), 3 deletions(-) create mode 100644 drivers/acpi/nfit/intel.c