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authorDave Jiang <dave.jiang@intel.com>2018-12-07 13:29:09 -0700
committerDan Williams <dan.j.williams@intel.com>2018-12-21 12:44:41 -0800
commitd2a4ac73f56a5d0709d28b41fec8d15e4500f8f1 (patch)
tree6ae066b618c3c0c68865b0783f88da25d2d69a7a /drivers/nvdimm
parent03b65b22ada8115a7a7bfdf0789f6a94adfd6070 (diff)
acpi/nfit, libnvdimm: Add enable/update passphrase support for Intel nvdimms
Add support for enabling and updating passphrase on the Intel nvdimms. The passphrase is the an encrypted key in the kernel user keyring. We trigger the update via writing "update <old_keyid> <new_keyid>" to the sysfs attribute "security". If no <old_keyid> exists (for enabling security) then a 0 should be used. Signed-off-by: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/nvdimm')
-rw-r--r--drivers/nvdimm/dimm_devs.c11
-rw-r--r--drivers/nvdimm/nd-core.h7
-rw-r--r--drivers/nvdimm/security.c58
3 files changed, 69 insertions, 7 deletions
diff --git a/drivers/nvdimm/dimm_devs.c b/drivers/nvdimm/dimm_devs.c
index 7f42cc4e119b..1cc3a6af3d0e 100644
--- a/drivers/nvdimm/dimm_devs.c
+++ b/drivers/nvdimm/dimm_devs.c
@@ -392,8 +392,9 @@ static ssize_t security_show(struct device *dev,
}
#define OPS \
- C( OP_FREEZE, "freeze", 1), \
- C( OP_DISABLE, "disable", 2)
+ C( OP_FREEZE, "freeze", 1), \
+ C( OP_DISABLE, "disable", 2), \
+ C( OP_UPDATE, "update", 3)
#undef C
#define C(a, b, c) a
enum nvdimmsec_op_ids { OPS };
@@ -444,6 +445,9 @@ static ssize_t __security_store(struct device *dev, const char *buf, size_t len)
} else if (i == OP_DISABLE) {
dev_dbg(dev, "disable %u\n", key);
rc = nvdimm_security_disable(nvdimm, key);
+ } else if (i == OP_UPDATE) {
+ dev_dbg(dev, "update %u %u\n", key, newkey);
+ rc = nvdimm_security_update(nvdimm, key, newkey);
} else
return -EINVAL;
@@ -493,7 +497,8 @@ 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 || nvdimm->sec.ops->disable)
+ if (nvdimm->sec.ops->freeze || nvdimm->sec.ops->disable
+ || nvdimm->sec.ops->change_key)
return a->mode;
return 0444;
}
diff --git a/drivers/nvdimm/nd-core.h b/drivers/nvdimm/nd-core.h
index d1351c0b1119..c2567f9ae07b 100644
--- a/drivers/nvdimm/nd-core.h
+++ b/drivers/nvdimm/nd-core.h
@@ -59,12 +59,19 @@ static inline enum nvdimm_security_state nvdimm_security_state(
int nvdimm_security_freeze(struct nvdimm *nvdimm);
#if IS_ENABLED(CONFIG_NVDIMM_KEYS)
int nvdimm_security_disable(struct nvdimm *nvdimm, unsigned int keyid);
+int nvdimm_security_update(struct nvdimm *nvdimm, unsigned int keyid,
+ unsigned int new_keyid);
#else
static inline int nvdimm_security_disable(struct nvdimm *nvdimm,
unsigned int keyid)
{
return -EOPNOTSUPP;
}
+static inline int nvdimm_security_update(struct nvdimm *nvdimm, unsigned int keyid,
+ unsigned int new_keyid)
+{
+ return -EOPNOTSUPP;
+}
#endif
/**
diff --git a/drivers/nvdimm/security.c b/drivers/nvdimm/security.c
index 647a99dd3182..df7f070e96fb 100644
--- a/drivers/nvdimm/security.c
+++ b/drivers/nvdimm/security.c
@@ -15,6 +15,9 @@
#include "nd-core.h"
#include "nd.h"
+#define NVDIMM_BASE_KEY 0
+#define NVDIMM_NEW_KEY 1
+
static bool key_revalidate = true;
module_param(key_revalidate, bool, 0444);
MODULE_PARM_DESC(key_revalidate, "Require key validation at init.");
@@ -70,7 +73,7 @@ static struct key *nvdimm_request_key(struct nvdimm *nvdimm)
}
static struct key *nvdimm_lookup_user_key(struct nvdimm *nvdimm,
- key_serial_t id)
+ key_serial_t id, int subclass)
{
key_ref_t keyref;
struct key *key;
@@ -86,10 +89,10 @@ static struct key *nvdimm_lookup_user_key(struct nvdimm *nvdimm,
key_put(key);
return NULL;
}
- dev_dbg(dev, "%s: key found: %#x\n", __func__, key_serial(key));
+ dev_dbg(dev, "%s: key found: %#x\n", __func__, key_serial(key));
- down_read(&key->sem);
+ down_read_nested(&key->sem, subclass);
epayload = dereference_key_locked(key);
if (epayload->decrypted_datalen != NVDIMM_PASSPHRASE_LEN) {
up_read(&key->sem);
@@ -197,7 +200,7 @@ int nvdimm_security_disable(struct nvdimm *nvdimm, unsigned int keyid)
return -EIO;
}
- key = nvdimm_lookup_user_key(nvdimm, keyid);
+ key = nvdimm_lookup_user_key(nvdimm, keyid, NVDIMM_BASE_KEY);
if (!key)
return -ENOKEY;
@@ -209,3 +212,50 @@ int nvdimm_security_disable(struct nvdimm *nvdimm, unsigned int keyid)
nvdimm->sec.state = nvdimm_security_state(nvdimm);
return rc;
}
+
+int nvdimm_security_update(struct nvdimm *nvdimm, unsigned int keyid,
+ unsigned int new_keyid)
+{
+ struct device *dev = &nvdimm->dev;
+ struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
+ struct key *key, *newkey;
+ 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->change_key
+ || nvdimm->sec.state < 0)
+ return -EOPNOTSUPP;
+
+ if (nvdimm->sec.state >= NVDIMM_SECURITY_FROZEN) {
+ dev_warn(dev, "Incorrect security state: %d\n",
+ nvdimm->sec.state);
+ return -EIO;
+ }
+
+ if (keyid == 0)
+ key = NULL;
+ else {
+ key = nvdimm_lookup_user_key(nvdimm, keyid, NVDIMM_BASE_KEY);
+ if (!key)
+ return -ENOKEY;
+ }
+
+ newkey = nvdimm_lookup_user_key(nvdimm, new_keyid, NVDIMM_NEW_KEY);
+ if (!newkey) {
+ nvdimm_put_key(key);
+ return -ENOKEY;
+ }
+
+ rc = nvdimm->sec.ops->change_key(nvdimm, key ? key_data(key) : NULL,
+ key_data(newkey));
+ dev_dbg(dev, "key: %d %d update: %s\n",
+ key_serial(key), key_serial(newkey),
+ rc == 0 ? "success" : "fail");
+
+ nvdimm_put_key(newkey);
+ nvdimm_put_key(key);
+ nvdimm->sec.state = nvdimm_security_state(nvdimm);
+ return rc;
+}

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