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path: root/drivers/nvdimm/security.c
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Diffstat (limited to 'drivers/nvdimm/security.c')
-rw-r--r--drivers/nvdimm/security.c118
1 files changed, 73 insertions, 45 deletions
diff --git a/drivers/nvdimm/security.c b/drivers/nvdimm/security.c
index f8bb746a549f..a570f2263a42 100644
--- a/drivers/nvdimm/security.c
+++ b/drivers/nvdimm/security.c
@@ -22,6 +22,8 @@ static bool key_revalidate = true;
module_param(key_revalidate, bool, 0444);
MODULE_PARM_DESC(key_revalidate, "Require key validation at init.");
+static const char zero_key[NVDIMM_PASSPHRASE_LEN];
+
static void *key_data(struct key *key)
{
struct encrypted_key_payload *epayload = dereference_key_locked(key);
@@ -75,6 +77,16 @@ static struct key *nvdimm_request_key(struct nvdimm *nvdimm)
return key;
}
+static const void *nvdimm_get_key_payload(struct nvdimm *nvdimm,
+ struct key **key)
+{
+ *key = nvdimm_request_key(nvdimm);
+ if (!*key)
+ return zero_key;
+
+ return key_data(*key);
+}
+
static struct key *nvdimm_lookup_user_key(struct nvdimm *nvdimm,
key_serial_t id, int subclass)
{
@@ -105,36 +117,57 @@ static struct key *nvdimm_lookup_user_key(struct nvdimm *nvdimm,
return key;
}
-static struct key *nvdimm_key_revalidate(struct nvdimm *nvdimm)
+static const void *nvdimm_get_user_key_payload(struct nvdimm *nvdimm,
+ key_serial_t id, int subclass, struct key **key)
+{
+ *key = NULL;
+ if (id == 0) {
+ if (subclass == NVDIMM_BASE_KEY)
+ return zero_key;
+ else
+ return NULL;
+ }
+
+ *key = nvdimm_lookup_user_key(nvdimm, id, subclass);
+ if (!*key)
+ return NULL;
+
+ return key_data(*key);
+}
+
+
+static int nvdimm_key_revalidate(struct nvdimm *nvdimm)
{
struct key *key;
int rc;
+ const void *data;
if (!nvdimm->sec.ops->change_key)
- return NULL;
+ return -EOPNOTSUPP;
- key = nvdimm_request_key(nvdimm);
- if (!key)
- return NULL;
+ data = nvdimm_get_key_payload(nvdimm, &key);
/*
* Send the same key to the hardware as new and old key to
* verify that the key is good.
*/
- rc = nvdimm->sec.ops->change_key(nvdimm, key_data(key),
- key_data(key), NVDIMM_USER);
+ rc = nvdimm->sec.ops->change_key(nvdimm, data, data, NVDIMM_USER);
if (rc < 0) {
nvdimm_put_key(key);
- key = NULL;
+ return rc;
}
- return key;
+
+ nvdimm_put_key(key);
+ nvdimm->sec.state = nvdimm_security_state(nvdimm, NVDIMM_USER);
+ return 0;
}
static int __nvdimm_security_unlock(struct nvdimm *nvdimm)
{
struct device *dev = &nvdimm->dev;
struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
- struct key *key = NULL;
+ struct key *key;
+ const void *data;
int rc;
/* The bus lock should be held at the top level of the call stack */
@@ -160,16 +193,11 @@ static int __nvdimm_security_unlock(struct nvdimm *nvdimm)
if (!key_revalidate)
return 0;
- key = nvdimm_key_revalidate(nvdimm);
- if (!key)
- return nvdimm_security_freeze(nvdimm);
+ return nvdimm_key_revalidate(nvdimm);
} else
- key = nvdimm_request_key(nvdimm);
+ data = nvdimm_get_key_payload(nvdimm, &key);
- if (!key)
- return -ENOKEY;
-
- rc = nvdimm->sec.ops->unlock(nvdimm, key_data(key));
+ rc = nvdimm->sec.ops->unlock(nvdimm, data);
dev_dbg(dev, "key: %d unlock: %s\n", key_serial(key),
rc == 0 ? "success" : "fail");
@@ -195,6 +223,7 @@ int nvdimm_security_disable(struct nvdimm *nvdimm, unsigned int keyid)
struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
struct key *key;
int rc;
+ const void *data;
/* The bus lock should be held at the top level of the call stack */
lockdep_assert_held(&nvdimm_bus->reconfig_mutex);
@@ -214,11 +243,12 @@ int nvdimm_security_disable(struct nvdimm *nvdimm, unsigned int keyid)
return -EBUSY;
}
- key = nvdimm_lookup_user_key(nvdimm, keyid, NVDIMM_BASE_KEY);
- if (!key)
+ data = nvdimm_get_user_key_payload(nvdimm, keyid,
+ NVDIMM_BASE_KEY, &key);
+ if (!data)
return -ENOKEY;
- rc = nvdimm->sec.ops->disable(nvdimm, key_data(key));
+ rc = nvdimm->sec.ops->disable(nvdimm, data);
dev_dbg(dev, "key: %d disable: %s\n", key_serial(key),
rc == 0 ? "success" : "fail");
@@ -235,6 +265,7 @@ int nvdimm_security_update(struct nvdimm *nvdimm, unsigned int keyid,
struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
struct key *key, *newkey;
int rc;
+ const void *data, *newdata;
/* The bus lock should be held at the top level of the call stack */
lockdep_assert_held(&nvdimm_bus->reconfig_mutex);
@@ -249,22 +280,19 @@ int nvdimm_security_update(struct nvdimm *nvdimm, unsigned int keyid,
return -EIO;
}
- if (keyid == 0)
- key = NULL;
- else {
- key = nvdimm_lookup_user_key(nvdimm, keyid, NVDIMM_BASE_KEY);
- if (!key)
- return -ENOKEY;
- }
+ data = nvdimm_get_user_key_payload(nvdimm, keyid,
+ NVDIMM_BASE_KEY, &key);
+ if (!data)
+ return -ENOKEY;
- newkey = nvdimm_lookup_user_key(nvdimm, new_keyid, NVDIMM_NEW_KEY);
- if (!newkey) {
+ newdata = nvdimm_get_user_key_payload(nvdimm, new_keyid,
+ NVDIMM_NEW_KEY, &newkey);
+ if (!newdata) {
nvdimm_put_key(key);
return -ENOKEY;
}
- rc = nvdimm->sec.ops->change_key(nvdimm, key ? key_data(key) : NULL,
- key_data(newkey), pass_type);
+ rc = nvdimm->sec.ops->change_key(nvdimm, data, newdata, pass_type);
dev_dbg(dev, "key: %d %d update%s: %s\n",
key_serial(key), key_serial(newkey),
pass_type == NVDIMM_MASTER ? "(master)" : "(user)",
@@ -286,8 +314,9 @@ int nvdimm_security_erase(struct nvdimm *nvdimm, unsigned int keyid,
{
struct device *dev = &nvdimm->dev;
struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
- struct key *key;
+ struct key *key = NULL;
int rc;
+ const void *data;
/* The bus lock should be held at the top level of the call stack */
lockdep_assert_held(&nvdimm_bus->reconfig_mutex);
@@ -319,11 +348,12 @@ int nvdimm_security_erase(struct nvdimm *nvdimm, unsigned int keyid,
return -EOPNOTSUPP;
}
- key = nvdimm_lookup_user_key(nvdimm, keyid, NVDIMM_BASE_KEY);
- if (!key)
+ data = nvdimm_get_user_key_payload(nvdimm, keyid,
+ NVDIMM_BASE_KEY, &key);
+ if (!data)
return -ENOKEY;
- rc = nvdimm->sec.ops->erase(nvdimm, key_data(key), pass_type);
+ rc = nvdimm->sec.ops->erase(nvdimm, data, pass_type);
dev_dbg(dev, "key: %d erase%s: %s\n", key_serial(key),
pass_type == NVDIMM_MASTER ? "(master)" : "(user)",
rc == 0 ? "success" : "fail");
@@ -337,8 +367,9 @@ int nvdimm_security_overwrite(struct nvdimm *nvdimm, unsigned int keyid)
{
struct device *dev = &nvdimm->dev;
struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
- struct key *key;
+ struct key *key = NULL;
int rc;
+ const void *data;
/* The bus lock should be held at the top level of the call stack */
lockdep_assert_held(&nvdimm_bus->reconfig_mutex);
@@ -368,15 +399,12 @@ int nvdimm_security_overwrite(struct nvdimm *nvdimm, unsigned int keyid)
return -EBUSY;
}
- if (keyid == 0)
- key = NULL;
- else {
- key = nvdimm_lookup_user_key(nvdimm, keyid, NVDIMM_BASE_KEY);
- if (!key)
- return -ENOKEY;
- }
+ data = nvdimm_get_user_key_payload(nvdimm, keyid,
+ NVDIMM_BASE_KEY, &key);
+ if (!data)
+ return -ENOKEY;
- rc = nvdimm->sec.ops->overwrite(nvdimm, key ? key_data(key) : NULL);
+ rc = nvdimm->sec.ops->overwrite(nvdimm, data);
dev_dbg(dev, "key: %d overwrite submission: %s\n", key_serial(key),
rc == 0 ? "success" : "fail");
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