@@ -16,6 +16,59 @@
#include <acpi/nfit.h>
#include "nfit.h"
+static int intel_dimm_security_erase(struct nvdimm_bus *nvdimm_bus,
+ struct nvdimm *nvdimm, const char *passphrase)
+{
+ struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
+ int cmd_rc, rc = 0, pkg_size;
+ struct nd_intel_secure_erase *cmd;
+ struct nd_cmd_pkg *pkg;
+ struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
+
+ if (!test_bit(NVDIMM_INTEL_SECURE_ERASE, &nfit_mem->dsm_mask))
+ return -ENOTTY;
+
+ pkg_size = sizeof(*pkg) + sizeof(*cmd);
+ pkg = kzalloc(pkg_size, GFP_KERNEL);
+ if (!pkg)
+ return -ENOMEM;
+
+ pkg->nd_command = NVDIMM_INTEL_SECURE_ERASE;
+ pkg->nd_family = NVDIMM_FAMILY_INTEL;
+ pkg->nd_size_in = ND_INTEL_PASSPHRASE_SIZE;
+ pkg->nd_size_out = ND_INTEL_STATUS_SIZE;
+ pkg->nd_fw_size = pkg->nd_size_out;
+ cmd = (struct nd_intel_secure_erase *)&pkg->nd_payload;
+ memcpy(cmd->passphrase, passphrase, ND_INTEL_PASSPHRASE_SIZE);
+ rc = nd_desc->ndctl(nd_desc, nvdimm, ND_CMD_CALL, pkg,
+ sizeof(pkg_size), &cmd_rc);
+ if (rc < 0)
+ goto out;
+ if (cmd_rc < 0) {
+ rc = cmd_rc;
+ goto out;
+ }
+
+ switch (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;
+ }
+
+ /* DIMM unlocked, invalidate all CPU caches before we read it */
+ wbinvd();
+
+ out:
+ kfree(pkg);
+ return rc;
+}
+
static int intel_dimm_security_freeze_lock(struct nvdimm_bus *nvdimm_bus,
struct nvdimm *nvdimm)
{
@@ -291,4 +344,5 @@ struct nvdimm_security_ops intel_security_ops = {
.change_key = intel_dimm_security_update_passphrase,
.disable = intel_dimm_security_disable,
.freeze_lock = intel_dimm_security_freeze_lock,
+ .erase = intel_dimm_security_erase,
};
@@ -85,6 +85,51 @@ int nvdimm_security_get_state(struct device *dev)
&nvdimm->state);
}
+static int nvdimm_security_erase(struct device *dev)
+{
+ struct nvdimm *nvdimm = to_nvdimm(dev);
+ struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
+ struct key *key;
+ char *payload;
+ int rc = 0;
+
+ if (!nvdimm->security_ops)
+ return 0;
+
+ /* lock the device and disallow driver bind */
+ device_lock(dev);
+ /* No driver data means dimm is disabled. Proceed if so. */
+ if (dev_get_drvdata(dev)) {
+ dev_warn(dev, "Unable to secure erase while DIMM active.\n");
+ rc = -EINVAL;
+ goto out;
+ }
+
+ if (nvdimm->state == NVDIMM_SECURITY_UNSUPPORTED)
+ goto out;
+
+ key = nvdimm_search_key(dev);
+ if (!key)
+ key = nvdimm_request_key(dev);
+ if (!key) {
+ rc = -ENXIO;
+ goto out;
+ }
+
+ down_read(&key->sem);
+ payload = key->payload.data[0];
+ rc = nvdimm->security_ops->erase(nvdimm_bus, nvdimm, payload);
+ up_read(&key->sem);
+ /* remove key since secure erase kills the passphrase */
+ key_invalidate(key);
+ key_put(key);
+
+ out:
+ device_unlock(dev);
+ nvdimm_security_get_state(dev);
+ return rc;
+}
+
static int nvdimm_security_freeze_lock(struct device *dev)
{
struct nvdimm *nvdimm = to_nvdimm(dev);
@@ -650,6 +695,8 @@ static ssize_t security_store(struct device *dev,
rc = nvdimm_security_disable(dev);
else if (strcmp(buf, "freeze") == 0 || strcmp(buf, "freeze\n") == 0)
rc = nvdimm_security_freeze_lock(dev);
+ else if (strcmp(buf, "erase") == 0 || strcmp(buf, "erase\n") == 0)
+ rc = nvdimm_security_erase(dev);
else
return -EINVAL;
@@ -181,6 +181,8 @@ struct nvdimm_security_ops {
struct nvdimm *nvdimm, const char *pass);
int (*freeze_lock)(struct nvdimm_bus *nvdimm_bus,
struct nvdimm *nvdimm);
+ int (*erase)(struct nvdimm_bus *nvdimm_bus,
+ struct nvdimm *nvdimm, const char *passphrase);
};
void badrange_init(struct badrange *badrange);
Adding support to issue a secure erase DSM to the Intel nvdimm. The required passphrase is acquired from userspace through the kernel key management. To trigger the action, "erase" is written to the "security" sysfs attribute. libnvdimm will support the erase generic API call. Signed-off-by: Dave Jiang <dave.jiang@intel.com> --- drivers/acpi/nfit/intel.c | 54 ++++++++++++++++++++++++++++++++++++++++++++ drivers/nvdimm/dimm_devs.c | 47 ++++++++++++++++++++++++++++++++++++++ include/linux/libnvdimm.h | 2 ++ 3 files changed, 103 insertions(+)