Add support for freeze security on Intel nvdimm. This locks out any
changes to security for the DIMM unless a reboot is done. This is triggered
by writing "freeze" to the "security" sysfs attribute. libnvdimm will
support the generic freeze_lock API call.
Signed-off-by: Dave Jiang <dave.ji...@intel.com>
---
drivers/acpi/nfit/intel.c | 51 ++++++++++++++++++++++++++++++++++++++++++++
drivers/nvdimm/dimm_devs.c | 22 +++++++++++++++++++
include/linux/libnvdimm.h | 2 ++
3 files changed, 75 insertions(+)
diff --git a/drivers/acpi/nfit/intel.c b/drivers/acpi/nfit/intel.c
index 2418f4b8c1fd..0ab56f03ebc4 100644
--- a/drivers/acpi/nfit/intel.c
+++ b/drivers/acpi/nfit/intel.c
@@ -18,6 +18,53 @@
#include "intel.h"
#include "nfit.h"
+static int intel_dimm_security_freeze_lock(struct nvdimm_bus *nvdimm_bus,
+ struct nvdimm *nvdimm)
+{
+ 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_freeze_lock cmd;
+ } nd_cmd = {
+ .pkg = {
+ .nd_command = NVDIMM_INTEL_FREEZE_LOCK,
+ .nd_family = NVDIMM_FAMILY_INTEL,
+ .nd_size_in = 0,
+ .nd_size_out = ND_INTEL_STATUS_SIZE,
+ .nd_fw_size = ND_INTEL_STATUS_SIZE,
+ },
+ .cmd = {
+ .status = 0,
+ },
+ };
+
+ if (!test_bit(NVDIMM_INTEL_FREEZE_LOCK, &nfit_mem->dsm_mask))
+ return -ENOTTY;
+
+ 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_STATE:
+ default:
+ rc = -ENXIO;
+ goto out;
+ }
+
+ out:
+ return rc;
+}
+
static int intel_dimm_security_disable(struct nvdimm_bus *nvdimm_bus,
struct nvdimm *nvdimm, struct nvdimm_key_data *nkey)
{
@@ -241,6 +288,9 @@ static int intel_dimm_security_state(struct nvdimm_bus
*nvdimm_bus,
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 if (nd_cmd.cmd.state & ND_INTEL_SEC_STATE_FROZEN ||
+ nd_cmd.cmd.state & ND_INTEL_SEC_STATE_PLIMIT)
+ *state = NVDIMM_SECURITY_FROZEN;
else
*state = NVDIMM_SECURITY_UNLOCKED;
} else
@@ -257,4 +307,5 @@ struct nvdimm_security_ops intel_security_ops = {
.unlock = intel_dimm_security_unlock,
.change_key = intel_dimm_security_update_passphrase,
.disable = intel_dimm_security_disable,
+ .freeze_lock = intel_dimm_security_freeze_lock,
};
diff --git a/drivers/nvdimm/dimm_devs.c b/drivers/nvdimm/dimm_devs.c
index 0ef89a2ec9d2..f1f2a52a108d 100644
--- a/drivers/nvdimm/dimm_devs.c
+++ b/drivers/nvdimm/dimm_devs.c
@@ -125,6 +125,26 @@ int nvdimm_security_get_state(struct device *dev)
&nvdimm->state);
}
+static int nvdimm_security_freeze_lock(struct device *dev)
+{
+ struct nvdimm *nvdimm = to_nvdimm(dev);
+ struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
+ int rc;
+
+ if (!nvdimm->security_ops)
+ return 0;
+
+ if (nvdimm->state == NVDIMM_SECURITY_UNSUPPORTED)
+ return 0;
+
+ rc = nvdimm->security_ops->freeze_lock(nvdimm_bus, nvdimm);
+ if (rc < 0)
+ return rc;
+
+ nvdimm_security_get_state(dev);
+ return 0;
+}
+
static int nvdimm_security_disable(struct device *dev)
{
struct nvdimm *nvdimm = to_nvdimm(dev);
@@ -668,6 +688,8 @@ static ssize_t security_store(struct device *dev,
rc = nvdimm_security_change_key(dev);
else if (sysfs_streq(buf, "disable"))
rc = nvdimm_security_disable(dev);
+ else if (sysfs_streq(buf, "freeze"))
+ rc = nvdimm_security_freeze_lock(dev);
else
return -EINVAL;
diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h
index 59ad04261f34..1836599ed5b8 100644
--- a/include/linux/libnvdimm.h
+++ b/include/linux/libnvdimm.h
@@ -185,6 +185,8 @@ struct nvdimm_security_ops {
struct nvdimm_key_data *new_data);
int (*disable)(struct nvdimm_bus *nvdimm_bus,
struct nvdimm *nvdimm, struct nvdimm_key_data *nkey);
+ int (*freeze_lock)(struct nvdimm_bus *nvdimm_bus,
+ struct nvdimm *nvdimm);
};
void badrange_init(struct badrange *badrange);
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