@@ -18,6 +18,63 @@
#include "intel.h"
#include "nfit.h"
+static int intel_dimm_security_erase(struct nvdimm_bus *nvdimm_bus,
+ struct nvdimm *nvdimm, const 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_secure_erase cmd;
+ } nd_cmd = {
+ .pkg = {
+ .nd_command = NVDIMM_INTEL_SECURE_ERASE,
+ .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_SECURE_ERASE, &nfit_mem->dsm_mask))
+ return -ENOTTY;
+
+ /* flush all cache before we erase DIMM */
+ wbinvd_on_all_cpus();
+ memcpy(nd_cmd.cmd.passphrase, nkey->data,
+ sizeof(nd_cmd.cmd.passphrase));
+ 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;
+ }
+
+ /* DIMM erased, invalidate all CPU caches before we read it */
+ wbinvd_on_all_cpus();
+
+ out:
+ return rc;
+}
+
static int intel_dimm_security_freeze_lock(struct nvdimm_bus *nvdimm_bus,
struct nvdimm *nvdimm)
{
@@ -321,4 +378,5 @@ const 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,
};
@@ -183,6 +183,74 @@ int nvdimm_security_get_state(struct device *dev)
&nvdimm->state);
}
+static int nvdimm_security_erase(struct device *dev, unsigned int keyid)
+{
+ struct nvdimm *nvdimm = to_nvdimm(dev);
+ struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
+ struct key *key;
+ struct user_key_payload *payload;
+ int rc = 0;
+ bool is_userkey = false;
+
+ if (!nvdimm->security_ops)
+ return -EOPNOTSUPP;
+
+ /* 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 = -EBUSY;
+ goto out;
+ }
+
+ if (nvdimm->state == NVDIMM_SECURITY_UNSUPPORTED) {
+ dev_warn(dev, "Attempt to secure erase in wrong state.\n");
+ rc = -EOPNOTSUPP;
+ goto out;
+ }
+
+ /* look for a key from keyring if exists and remove */
+ key = nvdimm_get_and_verify_key(dev, keyid);
+ if (IS_ERR(key)) {
+ dev_dbg(dev, "Unable to get and verify key\n");
+ rc = PTR_ERR(key);
+ goto out;
+ }
+ if (!key) {
+ dev_dbg(dev, "No cached key found\n");
+ /* get old user key */
+ key = nvdimm_lookup_user_key(dev, keyid);
+ if (!key) {
+ dev_dbg(dev, "Unable to retrieve user key: %d\n",
+ keyid);
+ rc = -ENOKEY;
+ goto out;
+ }
+ is_userkey = true;
+ }
+
+ down_read(&key->sem);
+ payload = key->payload.data[0];
+ rc = nvdimm->security_ops->erase(nvdimm_bus, nvdimm,
+ (void *)payload->data);
+ up_read(&key->sem);
+ /* remove key since secure erase kills the passphrase */
+
+ if (!is_userkey) {
+ key_unlink(nvdimm_keyring, key);
+ key_invalidate(key);
+ nvdimm->key = NULL;
+ }
+ 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);
@@ -817,6 +885,9 @@ static ssize_t security_store(struct device *dev,
} else if (sysfs_streq(buf, "freeze")) {
dev_dbg(dev, "freeze\n");
rc = nvdimm_security_freeze_lock(dev);
+ } else if (strcmp(cmd, "erase") == 0) {
+ dev_dbg(dev, "erase %u\n", old_key);
+ rc = nvdimm_security_erase(dev, old_key);
} else
return -EINVAL;
@@ -187,6 +187,9 @@ struct nvdimm_security_ops {
const struct nvdimm_key_data *nkey);
int (*freeze_lock)(struct nvdimm_bus *nvdimm_bus,
struct nvdimm *nvdimm);
+ int (*erase)(struct nvdimm_bus *nvdimm_bus,
+ struct nvdimm *nvdimm,
+ const struct nvdimm_key_data *nkey);
};
void badrange_init(struct badrange *badrange);