@@ -162,6 +162,49 @@ static int intel_security_unlock(struct nvdimm *nvdimm,
return 0;
}
+static int intel_security_disable(struct nvdimm *nvdimm,
+ const struct nvdimm_key_data *key_data)
+{
+ int rc;
+ struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
+ struct {
+ struct nd_cmd_pkg pkg;
+ struct nd_intel_disable_passphrase cmd;
+ } nd_cmd = {
+ .pkg = {
+ .nd_command = NVDIMM_INTEL_DISABLE_PASSPHRASE,
+ .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_DISABLE_PASSPHRASE, &nfit_mem->dsm_mask))
+ return -ENOTTY;
+
+ memcpy(nd_cmd.cmd.passphrase, key_data->data,
+ sizeof(nd_cmd.cmd.passphrase));
+ rc = nvdimm_ctl(nvdimm, ND_CMD_CALL, &nd_cmd, sizeof(nd_cmd), NULL);
+ if (rc < 0)
+ return rc;
+
+ switch (nd_cmd.cmd.status) {
+ case 0:
+ break;
+ case ND_INTEL_STATUS_INVALID_PASS:
+ return -EINVAL;
+ case ND_INTEL_STATUS_INVALID_STATE:
+ default:
+ return -ENXIO;
+ }
+
+ return 0;
+}
+
/*
* TODO: define a cross arch wbinvd equivalent when/if
* NVDIMM_FAMILY_INTEL command support arrives on another arch.
@@ -182,6 +225,7 @@ static const struct nvdimm_security_ops __intel_security_ops = {
.state = intel_security_state,
.freeze = intel_security_freeze,
.change_key = intel_security_change_key,
+ .disable = intel_security_disable,
#ifdef CONFIG_X86
.unlock = intel_security_unlock,
#endif
@@ -391,17 +391,32 @@ static ssize_t security_show(struct device *dev,
return -ENOTTY;
}
+#define SEC_CMD_SIZE 32
+#define KEY_ID_SIZE 10 /* u32 size in string */
static ssize_t __security_store(struct device *dev, const char *buf, size_t len)
{
struct nvdimm *nvdimm = to_nvdimm(dev);
ssize_t rc;
+ char cmd[SEC_CMD_SIZE+1], keystr[KEY_ID_SIZE+1];
+ unsigned int key;
if (atomic_read(&nvdimm->busy))
return -EBUSY;
+ rc = sscanf(buf, "%"__stringify(SEC_CMD_SIZE)"s %"__stringify(KEY_ID_SIZE)"s",
+ cmd, keystr);
if (sysfs_streq(buf, "freeze")) {
dev_dbg(dev, "freeze\n");
rc = nvdimm_security_freeze(nvdimm);
+ } else if (sysfs_streq(cmd, "disable")) {
+ if (rc != 2)
+ return -EINVAL;
+ rc = kstrtouint(keystr, 0, &key);
+ if (rc < 0)
+ return rc;
+ rc = nvdimm_security_disable(nvdimm, key);
+ if (rc < 0)
+ return rc;
} else
return -EINVAL;
@@ -452,7 +467,7 @@ static umode_t nvdimm_visible(struct kobject *kobj, struct attribute *a, int n)
if (nvdimm->sec.state < 0)
return 0;
/* Are there any state mutation ops? */
- if (nvdimm->sec.ops->freeze)
+ if (nvdimm->sec.ops->freeze || nvdimm->sec.ops->disable)
return a->mode;
return 0444;
}
@@ -57,6 +57,7 @@ static inline enum nvdimm_security_state nvdimm_security_state(
return nvdimm->sec.ops->state(nvdimm);
}
int nvdimm_security_freeze(struct nvdimm *nvdimm);
+int nvdimm_security_disable(struct nvdimm *nvdimm, unsigned int keyid);
/**
* struct blk_alloc_info - tracking info for BLK dpa scanning
@@ -69,6 +69,36 @@ static struct key *nvdimm_request_key(struct nvdimm *nvdimm)
return key;
}
+static struct key *nvdimm_lookup_user_key(struct nvdimm *nvdimm,
+ key_serial_t id)
+{
+ key_ref_t keyref;
+ struct key *key;
+ struct encrypted_key_payload *epayload;
+ struct device *dev = &nvdimm->dev;
+
+ keyref = lookup_user_key(id, 0, 0);
+ if (IS_ERR(keyref))
+ return NULL;
+
+ key = key_ref_to_ptr(keyref);
+ if (key->type != &key_type_encrypted) {
+ key_put(key);
+ return NULL;
+ }
+ dev_dbg(dev, "%s: key found: %#x\n", __func__, key_serial(key));
+
+
+ down_read(&key->sem);
+ epayload = dereference_key_locked(key);
+ if (epayload->decrypted_datalen != NVDIMM_PASSPHRASE_LEN) {
+ up_read(&key->sem);
+ key_put(key);
+ key = NULL;
+ }
+ return key;
+}
+
static struct key *nvdimm_key_revalidate(struct nvdimm *nvdimm)
{
struct key *key;
@@ -146,3 +176,36 @@ int nvdimm_security_unlock(struct device *dev)
nvdimm_bus_unlock(dev);
return rc;
}
+
+int nvdimm_security_disable(struct nvdimm *nvdimm, unsigned int keyid)
+{
+ struct device *dev = &nvdimm->dev;
+ struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
+ struct key *key;
+ int rc;
+
+ /* The bus lock should be held at the top level of the call stack */
+ lockdep_assert_held(&nvdimm_bus->reconfig_mutex);
+
+ if (!nvdimm->sec.ops || !nvdimm->sec.ops->disable
+ || nvdimm->sec.state < 0)
+ return -EIO;
+
+ if (nvdimm->sec.state >= NVDIMM_SECURITY_FROZEN) {
+ dev_warn(dev, "Incorrect security state: %d\n",
+ nvdimm->sec.state);
+ return -EIO;
+ }
+
+ key = nvdimm_lookup_user_key(nvdimm, keyid);
+ if (!key)
+ return -ENOKEY;
+
+ rc = nvdimm->sec.ops->disable(nvdimm, key_data(key));
+ dev_dbg(dev, "key: %d disable: %s\n", key_serial(key),
+ rc == 0 ? "success" : "fail");
+
+ nvdimm_put_key(key);
+ nvdimm->sec.state = nvdimm_security_state(nvdimm);
+ return rc;
+}
@@ -178,6 +178,8 @@ struct nvdimm_security_ops {
const struct nvdimm_key_data *new_data);
int (*unlock)(struct nvdimm *nvdimm,
const struct nvdimm_key_data *key_data);
+ int (*disable)(struct nvdimm *nvdimm,
+ const struct nvdimm_key_data *key_data);
};
void badrange_init(struct badrange *badrange);