From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id 0A2D8210D93BE for ; Fri, 3 Aug 2018 17:01:50 -0700 (PDT) Subject: [PATCH v7 07/12] nfit/libnvdimm: add disable passphrase support to Intel nvdimm. From: Dave Jiang Date: Fri, 03 Aug 2018 17:01:48 -0700 Message-ID: <153334090870.60955.12048473116408849750.stgit@djiang5-desk3.ch.intel.com> In-Reply-To: <153334018216.60955.13349338519981704524.stgit@djiang5-desk3.ch.intel.com> References: <153334018216.60955.13349338519981704524.stgit@djiang5-desk3.ch.intel.com> MIME-Version: 1.0 List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-nvdimm-bounces@lists.01.org Sender: "Linux-nvdimm" To: linux-nvdimm@lists.01.org Cc: alison.schofield@intel.com, keescook@chromium.org, ebiggers3@gmail.com, dhowells@redhat.com, keyrings@vger.kernel.org List-ID: Add support to disable passphrase (security) for the Intel nvdimm. The passphrase used for disabling is pulled from userspace via the kernel key management. The action is triggered by writing "disable" to the sysfs attribute "security". libnvdimm will support the generic disable API call. Signed-off-by: Dave Jiang Reviewed-by: Dan Williams --- drivers/acpi/nfit/intel.c | 53 ++++++++++++++++++++++++++++++++++++++++++++ drivers/nvdimm/dimm_devs.c | 45 +++++++++++++++++++++++++++++++++++++ include/linux/libnvdimm.h | 3 ++ 3 files changed, 100 insertions(+), 1 deletion(-) diff --git a/drivers/acpi/nfit/intel.c b/drivers/acpi/nfit/intel.c index 314eae7e02d7..21d30222371f 100644 --- a/drivers/acpi/nfit/intel.c +++ b/drivers/acpi/nfit/intel.c @@ -18,6 +18,58 @@ #include "intel.h" #include "nfit.h" +static int intel_dimm_security_disable(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_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, 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; + } + + out: + return rc; +} + /* * The update passphrase takes the old passphrase and the new passphrase * and send those to the nvdimm. The nvdimm will verify the old @@ -217,4 +269,5 @@ const struct nvdimm_security_ops intel_security_ops = { .state = intel_dimm_security_state, .unlock = intel_dimm_security_unlock, .change_key = intel_dimm_security_update_passphrase, + .disable = intel_dimm_security_disable, }; diff --git a/drivers/nvdimm/dimm_devs.c b/drivers/nvdimm/dimm_devs.c index af0f4ad9d513..4169aabe814e 100644 --- a/drivers/nvdimm/dimm_devs.c +++ b/drivers/nvdimm/dimm_devs.c @@ -143,6 +143,47 @@ int nvdimm_security_get_state(struct device *dev) &nvdimm->state); } +static int nvdimm_security_disable(struct device *dev) +{ + struct nvdimm *nvdimm = to_nvdimm(dev); + struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); + struct key *key; + int rc; + struct user_key_payload *payload; + + if (!nvdimm->security_ops) + return 0; + + if (nvdimm->state == NVDIMM_SECURITY_UNSUPPORTED) + return 0; + + key = nvdimm_get_key(dev); + if (!key) { + dev_warn(dev, "no key found\n"); + return -ENOKEY; + } + + down_read(&key->sem); + payload = key->payload.data[0]; + rc = nvdimm->security_ops->disable(nvdimm_bus, nvdimm, + (void *)payload->data); + up_read(&key->sem); + if (rc < 0) { + dev_warn(dev, "unlock failed\n"); + goto out; + } + + /* If we succeed then remove the key */ + key_unlink(nvdimm_keyring, key); + key_invalidate(key); + nvdimm->key = NULL; + + out: + key_put(key); + nvdimm_security_get_state(dev); + return rc; +} + int nvdimm_security_unlock_dimm(struct device *dev) { struct nvdimm *nvdimm = to_nvdimm(dev); @@ -752,7 +793,9 @@ static ssize_t security_store(struct device *dev, if (__parse_update(buf, len, &old_id, &new_id) == 0) { dev_dbg(dev, "update: old: %u new: %u\n", old_id, new_id); rc = nvdimm_security_change_key(dev, old_id, new_id); - } else + } else if (sysfs_streq(buf, "disable")) + rc = nvdimm_security_disable(dev); + else return -EINVAL; if (rc == 0) diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h index bd6a413164ee..c60ab4b238f3 100644 --- a/include/linux/libnvdimm.h +++ b/include/linux/libnvdimm.h @@ -182,6 +182,9 @@ struct nvdimm_security_ops { struct nvdimm *nvdimm, const struct nvdimm_key_data *old_data, const struct nvdimm_key_data *new_data); + int (*disable)(struct nvdimm_bus *nvdimm_bus, + struct nvdimm *nvdimm, + const struct nvdimm_key_data *nkey); }; void badrange_init(struct badrange *badrange); _______________________________________________ Linux-nvdimm mailing list Linux-nvdimm@lists.01.org https://lists.01.org/mailman/listinfo/linux-nvdimm