From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) (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 85AE52035D6E2 for ; Wed, 14 Aug 2019 18:36:43 -0700 (PDT) Subject: [PATCH 2/3] libnvdimm/security: Tighten scope of nvdimm->busy vs security operations From: Dan Williams Date: Wed, 14 Aug 2019 18:20:23 -0700 Message-ID: <156583202386.2815870.16611751329252858110.stgit@dwillia2-desk3.amr.corp.intel.com> In-Reply-To: <156583201347.2815870.4687949334637966672.stgit@dwillia2-desk3.amr.corp.intel.com> References: <156583201347.2815870.4687949334637966672.stgit@dwillia2-desk3.amr.corp.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: linux-kernel@vger.kernel.org List-ID: The blanket blocking of all security operations while the DIMM is in active use in a region is too restrictive. The only security operations that need to be aware of the ->busy state are those that mutate the state of data, i.e. erase and overwrite. Refactor the ->busy checks to be applied at the entry common entry point in __security_store() rather than each of the helper routines. Cc: Dave Jiang Signed-off-by: Dan Williams --- drivers/nvdimm/dimm_devs.c | 33 ++++++++++++++++----------------- drivers/nvdimm/security.c | 10 ---------- 2 files changed, 16 insertions(+), 27 deletions(-) diff --git a/drivers/nvdimm/dimm_devs.c b/drivers/nvdimm/dimm_devs.c index 53330625fe07..d837cb9be83d 100644 --- a/drivers/nvdimm/dimm_devs.c +++ b/drivers/nvdimm/dimm_devs.c @@ -424,9 +424,6 @@ static ssize_t __security_store(struct device *dev, const char *buf, size_t len) unsigned int key, newkey; int i; - if (atomic_read(&nvdimm->busy)) - return -EBUSY; - rc = sscanf(buf, "%"__stringify(SEC_CMD_SIZE)"s" " %"__stringify(KEY_ID_SIZE)"s" " %"__stringify(KEY_ID_SIZE)"s", @@ -451,23 +448,25 @@ 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, NVDIMM_USER); - } else if (i == OP_ERASE) { - dev_dbg(dev, "erase %u\n", key); - rc = nvdimm_security_erase(nvdimm, key, NVDIMM_USER); + } else if (i == OP_UPDATE || i == OP_MASTER_UPDATE) { + dev_dbg(dev, "%s %u %u\n", ops[i].name, key, newkey); + rc = nvdimm_security_update(nvdimm, key, newkey, i == OP_UPDATE + ? NVDIMM_USER : NVDIMM_MASTER); + } else if (i == OP_ERASE || i == OP_MASTER_ERASE) { + dev_dbg(dev, "%s %u\n", ops[i].name, key); + if (atomic_read(&nvdimm->busy)) { + dev_dbg(dev, "Unable to secure erase while DIMM active.\n"); + return -EBUSY; + } + rc = nvdimm_security_erase(nvdimm, key, i == OP_ERASE + ? NVDIMM_USER : NVDIMM_MASTER); } else if (i == OP_OVERWRITE) { dev_dbg(dev, "overwrite %u\n", key); + if (atomic_read(&nvdimm->busy)) { + dev_dbg(dev, "Unable to overwrite while DIMM active.\n"); + return -EBUSY; + } rc = nvdimm_security_overwrite(nvdimm, key); - } else if (i == OP_MASTER_UPDATE) { - dev_dbg(dev, "master_update %u %u\n", key, newkey); - rc = nvdimm_security_update(nvdimm, key, newkey, - NVDIMM_MASTER); - } else if (i == OP_MASTER_ERASE) { - dev_dbg(dev, "master_erase %u\n", key); - rc = nvdimm_security_erase(nvdimm, key, - NVDIMM_MASTER); } else return -EINVAL; diff --git a/drivers/nvdimm/security.c b/drivers/nvdimm/security.c index 5862d0eee9db..2166e627383a 100644 --- a/drivers/nvdimm/security.c +++ b/drivers/nvdimm/security.c @@ -334,11 +334,6 @@ int nvdimm_security_erase(struct nvdimm *nvdimm, unsigned int keyid, || !nvdimm->sec.flags) return -EOPNOTSUPP; - if (atomic_read(&nvdimm->busy)) { - dev_dbg(dev, "Unable to secure erase while DIMM active.\n"); - return -EBUSY; - } - rc = check_security_state(nvdimm); if (rc) return rc; @@ -380,11 +375,6 @@ int nvdimm_security_overwrite(struct nvdimm *nvdimm, unsigned int keyid) || !nvdimm->sec.flags) return -EOPNOTSUPP; - if (atomic_read(&nvdimm->busy)) { - dev_dbg(dev, "Unable to overwrite while DIMM active.\n"); - return -EBUSY; - } - if (dev->driver == NULL) { dev_dbg(dev, "Unable to overwrite while DIMM active.\n"); return -EINVAL; _______________________________________________ Linux-nvdimm mailing list Linux-nvdimm@lists.01.org https://lists.01.org/mailman/listinfo/linux-nvdimm