diff options
| -rw-r--r-- | drivers/acpi/nfit/core.c | 5 | ||||
| -rw-r--r-- | drivers/acpi/nfit/intel.c | 90 | ||||
| -rw-r--r-- | drivers/nvdimm/bus.c | 21 | ||||
| -rw-r--r-- | drivers/nvdimm/dimm_devs.c | 32 | ||||
| -rw-r--r-- | drivers/nvdimm/nd-core.h | 14 | ||||
| -rw-r--r-- | drivers/nvdimm/region_devs.c | 5 | ||||
| -rw-r--r-- | drivers/nvdimm/security.c | 133 | ||||
| -rw-r--r-- | include/linux/libnvdimm.h | 9 |
8 files changed, 304 insertions, 5 deletions
diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c index 41c261ab793e..ab57a3fe4511 100644 --- a/drivers/acpi/nfit/core.c +++ b/drivers/acpi/nfit/core.c @@ -2045,6 +2045,11 @@ static int acpi_nfit_register_dimms(struct acpi_nfit_desc *acpi_desc) if (!nvdimm) continue; + rc = nvdimm_security_setup_events(nvdimm); + if (rc < 0) + dev_warn(acpi_desc->dev, + "security event setup failed: %d\n", rc); + nfit_kernfs = sysfs_get_dirent(nvdimm_kobj(nvdimm)->sd, "nfit"); if (nfit_kernfs) nfit_mem->flags_attr = sysfs_get_dirent(nfit_kernfs, diff --git a/drivers/acpi/nfit/intel.c b/drivers/acpi/nfit/intel.c index e0e04b730b4f..82e805d4458a 100644 --- a/drivers/acpi/nfit/intel.c +++ b/drivers/acpi/nfit/intel.c @@ -28,6 +28,14 @@ static enum nvdimm_security_state intel_security_state(struct nvdimm *nvdimm) if (!test_bit(NVDIMM_INTEL_GET_SECURITY_STATE, &nfit_mem->dsm_mask)) return -ENXIO; + /* + * Short circuit the state retrieval while we are doing overwrite. + * The DSM spec states that the security state is indeterminate + * until the overwrite DSM completes. + */ + if (nvdimm_in_overwrite(nvdimm)) + return NVDIMM_SECURITY_OVERWRITE; + rc = nvdimm_ctl(nvdimm, ND_CMD_CALL, &nd_cmd, sizeof(nd_cmd), NULL); if (rc < 0) return rc; @@ -249,6 +257,86 @@ static int intel_security_erase(struct nvdimm *nvdimm, return 0; } +static int intel_security_query_overwrite(struct nvdimm *nvdimm) +{ + int rc; + struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm); + struct { + struct nd_cmd_pkg pkg; + struct nd_intel_query_overwrite cmd; + } nd_cmd = { + .pkg = { + .nd_command = NVDIMM_INTEL_QUERY_OVERWRITE, + .nd_family = NVDIMM_FAMILY_INTEL, + .nd_size_out = ND_INTEL_STATUS_SIZE, + .nd_fw_size = ND_INTEL_STATUS_SIZE, + }, + }; + + if (!test_bit(NVDIMM_INTEL_QUERY_OVERWRITE, &nfit_mem->dsm_mask)) + return -ENOTTY; + + 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_OQUERY_INPROGRESS: + return -EBUSY; + default: + return -ENXIO; + } + + /* flush all cache before we make the nvdimms available */ + nvdimm_invalidate_cache(); + return 0; +} + +static int intel_security_overwrite(struct nvdimm *nvdimm, + const struct nvdimm_key_data *nkey) +{ + int rc; + struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm); + struct { + struct nd_cmd_pkg pkg; + struct nd_intel_overwrite cmd; + } nd_cmd = { + .pkg = { + .nd_command = NVDIMM_INTEL_OVERWRITE, + .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, + }, + }; + + if (!test_bit(NVDIMM_INTEL_OVERWRITE, &nfit_mem->dsm_mask)) + return -ENOTTY; + + /* flush all cache before we erase DIMM */ + nvdimm_invalidate_cache(); + if (nkey) + memcpy(nd_cmd.cmd.passphrase, nkey->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: + return 0; + case ND_INTEL_STATUS_OVERWRITE_UNSUPPORTED: + return -ENOTSUPP; + case ND_INTEL_STATUS_INVALID_PASS: + return -EINVAL; + case ND_INTEL_STATUS_INVALID_STATE: + default: + return -ENXIO; + } +} + /* * TODO: define a cross arch wbinvd equivalent when/if * NVDIMM_FAMILY_INTEL command support arrives on another arch. @@ -273,6 +361,8 @@ static const struct nvdimm_security_ops __intel_security_ops = { #ifdef CONFIG_X86 .unlock = intel_security_unlock, .erase = intel_security_erase, + .overwrite = intel_security_overwrite, + .query_overwrite = intel_security_query_overwrite, #endif }; diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c index eae17d8ee539..adb01c1f92de 100644 --- a/drivers/nvdimm/bus.c +++ b/drivers/nvdimm/bus.c @@ -393,9 +393,24 @@ static int child_unregister(struct device *dev, void *data) * i.e. remove classless children */ if (dev->class) - /* pass */; - else - nd_device_unregister(dev, ND_SYNC); + return 0; + + if (is_nvdimm(dev)) { + struct nvdimm *nvdimm = to_nvdimm(dev); + bool dev_put = false; + + /* We are shutting down. Make state frozen artificially. */ + nvdimm_bus_lock(dev); + nvdimm->sec.state = NVDIMM_SECURITY_FROZEN; + if (test_and_clear_bit(NDD_WORK_PENDING, &nvdimm->flags)) + dev_put = true; + nvdimm_bus_unlock(dev); + cancel_delayed_work_sync(&nvdimm->dwork); + if (dev_put) + put_device(dev); + } + nd_device_unregister(dev, ND_SYNC); + return 0; } diff --git a/drivers/nvdimm/dimm_devs.c b/drivers/nvdimm/dimm_devs.c index bc432b7c17b8..6affa270abd3 100644 --- a/drivers/nvdimm/dimm_devs.c +++ b/drivers/nvdimm/dimm_devs.c @@ -395,7 +395,8 @@ static ssize_t security_show(struct device *dev, C( OP_FREEZE, "freeze", 1), \ C( OP_DISABLE, "disable", 2), \ C( OP_UPDATE, "update", 3), \ - C( OP_ERASE, "erase", 2) + C( OP_ERASE, "erase", 2), \ + C( OP_OVERWRITE, "overwrite", 2) #undef C #define C(a, b, c) a enum nvdimmsec_op_ids { OPS }; @@ -452,6 +453,9 @@ static ssize_t __security_store(struct device *dev, const char *buf, size_t len) } else if (i == OP_ERASE) { dev_dbg(dev, "erase %u\n", key); rc = nvdimm_security_erase(nvdimm, key); + } else if (i == OP_OVERWRITE) { + dev_dbg(dev, "overwrite %u\n", key); + rc = nvdimm_security_overwrite(nvdimm, key); } else return -EINVAL; @@ -503,7 +507,8 @@ static umode_t nvdimm_visible(struct kobject *kobj, struct attribute *a, int n) /* Are there any state mutation ops? */ if (nvdimm->sec.ops->freeze || nvdimm->sec.ops->disable || nvdimm->sec.ops->change_key - || nvdimm->sec.ops->erase) + || nvdimm->sec.ops->erase + || nvdimm->sec.ops->overwrite) return a->mode; return 0444; } @@ -546,6 +551,8 @@ struct nvdimm *__nvdimm_create(struct nvdimm_bus *nvdimm_bus, dev->devt = MKDEV(nvdimm_major, nvdimm->id); dev->groups = groups; nvdimm->sec.ops = sec_ops; + nvdimm->sec.overwrite_tmo = 0; + INIT_DELAYED_WORK(&nvdimm->dwork, nvdimm_security_overwrite_query); /* * Security state must be initialized before device_add() for * attribute visibility. @@ -557,6 +564,22 @@ struct nvdimm *__nvdimm_create(struct nvdimm_bus *nvdimm_bus, } EXPORT_SYMBOL_GPL(__nvdimm_create); +int nvdimm_security_setup_events(struct nvdimm *nvdimm) +{ + nvdimm->sec.overwrite_state = sysfs_get_dirent(nvdimm->dev.kobj.sd, + "security"); + if (!nvdimm->sec.overwrite_state) + return -ENODEV; + return 0; +} +EXPORT_SYMBOL_GPL(nvdimm_security_setup_events); + +int nvdimm_in_overwrite(struct nvdimm *nvdimm) +{ + return test_bit(NDD_SECURITY_OVERWRITE, &nvdimm->flags); +} +EXPORT_SYMBOL_GPL(nvdimm_in_overwrite); + int nvdimm_security_freeze(struct nvdimm *nvdimm) { int rc; @@ -569,6 +592,11 @@ int nvdimm_security_freeze(struct nvdimm *nvdimm) if (nvdimm->sec.state < 0) return -EIO; + if (test_bit(NDD_SECURITY_OVERWRITE, &nvdimm->flags)) { + dev_warn(&nvdimm->dev, "Overwrite operation in progress.\n"); + return -EBUSY; + } + rc = nvdimm->sec.ops->freeze(nvdimm); nvdimm->sec.state = nvdimm_security_state(nvdimm); diff --git a/drivers/nvdimm/nd-core.h b/drivers/nvdimm/nd-core.h index b4b633ccfbe9..952d688982d8 100644 --- a/drivers/nvdimm/nd-core.h +++ b/drivers/nvdimm/nd-core.h @@ -21,6 +21,7 @@ extern struct list_head nvdimm_bus_list; extern struct mutex nvdimm_bus_list_mutex; extern int nvdimm_major; +extern struct workqueue_struct *nvdimm_wq; struct nvdimm_bus { struct nvdimm_bus_descriptor *nd_desc; @@ -45,7 +46,10 @@ struct nvdimm { struct { const struct nvdimm_security_ops *ops; enum nvdimm_security_state state; + unsigned int overwrite_tmo; + struct kernfs_node *overwrite_state; } sec; + struct delayed_work dwork; }; static inline enum nvdimm_security_state nvdimm_security_state( @@ -62,6 +66,8 @@ int nvdimm_security_disable(struct nvdimm *nvdimm, unsigned int keyid); int nvdimm_security_update(struct nvdimm *nvdimm, unsigned int keyid, unsigned int new_keyid); int nvdimm_security_erase(struct nvdimm *nvdimm, unsigned int keyid); +int nvdimm_security_overwrite(struct nvdimm *nvdimm, unsigned int keyid); +void nvdimm_security_overwrite_query(struct work_struct *work); #else static inline int nvdimm_security_disable(struct nvdimm *nvdimm, unsigned int keyid) @@ -77,6 +83,14 @@ static inline int nvdimm_security_erase(struct nvdimm *nvdimm, unsigned int keyi { return -EOPNOTSUPP; } +static inline int nvdimm_security_overwrite(struct nvdimm *nvdimm, + unsigned int keyid) +{ + return -EOPNOTSUPP; +} +static inline void nvdimm_security_overwrite_query(struct work_struct *work) +{ +} #endif /** diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c index 174a418cb171..b4d8e4ed3020 100644 --- a/drivers/nvdimm/region_devs.c +++ b/drivers/nvdimm/region_devs.c @@ -79,6 +79,11 @@ int nd_region_activate(struct nd_region *nd_region) struct nd_mapping *nd_mapping = &nd_region->mapping[i]; struct nvdimm *nvdimm = nd_mapping->nvdimm; + if (test_bit(NDD_SECURITY_OVERWRITE, &nvdimm->flags)) { + nvdimm_bus_unlock(&nd_region->dev); + return -EBUSY; + } + /* at least one null hint slot per-dimm for the "no-hint" case */ flush_data_size += sizeof(void *); num_flush = min_not_zero(num_flush, nvdimm->num_flush); diff --git a/drivers/nvdimm/security.c b/drivers/nvdimm/security.c index 05677be3c0dd..5055979f89c4 100644 --- a/drivers/nvdimm/security.c +++ b/drivers/nvdimm/security.c @@ -143,6 +143,11 @@ static int __nvdimm_security_unlock(struct nvdimm *nvdimm) || nvdimm->sec.state < 0) return -EIO; + if (test_bit(NDD_SECURITY_OVERWRITE, &nvdimm->flags)) { + dev_warn(dev, "Security operation in progress.\n"); + return -EBUSY; + } + /* * If the pre-OS has unlocked the DIMM, attempt to send the key * from request_key() to the hardware for verification. Failure @@ -203,6 +208,11 @@ int nvdimm_security_disable(struct nvdimm *nvdimm, unsigned int keyid) return -EIO; } + if (test_bit(NDD_SECURITY_OVERWRITE, &nvdimm->flags)) { + dev_warn(dev, "Security operation in progress.\n"); + return -EBUSY; + } + key = nvdimm_lookup_user_key(nvdimm, keyid, NVDIMM_BASE_KEY); if (!key) return -ENOKEY; @@ -288,6 +298,11 @@ int nvdimm_security_erase(struct nvdimm *nvdimm, unsigned int keyid) return -EIO; } + if (test_bit(NDD_SECURITY_OVERWRITE, &nvdimm->flags)) { + dev_warn(dev, "Security operation in progress.\n"); + return -EBUSY; + } + key = nvdimm_lookup_user_key(nvdimm, keyid, NVDIMM_BASE_KEY); if (!key) return -ENOKEY; @@ -300,3 +315,121 @@ int nvdimm_security_erase(struct nvdimm *nvdimm, unsigned int keyid) nvdimm->sec.state = nvdimm_security_state(nvdimm); return rc; } + +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; + 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->overwrite + || nvdimm->sec.state < 0) + return -EOPNOTSUPP; + + if (atomic_read(&nvdimm->busy)) { + dev_warn(dev, "Unable to overwrite while DIMM active.\n"); + return -EBUSY; + } + + if (dev->driver == NULL) { + dev_warn(dev, "Unable to overwrite while DIMM active.\n"); + return -EINVAL; + } + + if (nvdimm->sec.state >= NVDIMM_SECURITY_FROZEN) { + dev_warn(dev, "Incorrect security state: %d\n", + nvdimm->sec.state); + return -EIO; + } + + if (test_bit(NDD_SECURITY_OVERWRITE, &nvdimm->flags)) { + dev_warn(dev, "Security operation in progress.\n"); + return -EBUSY; + } + + if (keyid == 0) + key = NULL; + else { + key = nvdimm_lookup_user_key(nvdimm, keyid, NVDIMM_BASE_KEY); + if (!key) + return -ENOKEY; + } + + rc = nvdimm->sec.ops->overwrite(nvdimm, key ? key_data(key) : NULL); + dev_dbg(dev, "key: %d overwrite submission: %s\n", key_serial(key), + rc == 0 ? "success" : "fail"); + + nvdimm_put_key(key); + if (rc == 0) { + set_bit(NDD_SECURITY_OVERWRITE, &nvdimm->flags); + set_bit(NDD_WORK_PENDING, &nvdimm->flags); + nvdimm->sec.state = NVDIMM_SECURITY_OVERWRITE; + /* + * Make sure we don't lose device while doing overwrite + * query. + */ + get_device(dev); + queue_delayed_work(system_wq, &nvdimm->dwork, 0); + } + return rc; +} + +void __nvdimm_security_overwrite_query(struct nvdimm *nvdimm) +{ + struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&nvdimm->dev); + int rc; + unsigned int tmo; + + /* The bus lock should be held at the top level of the call stack */ + lockdep_assert_held(&nvdimm_bus->reconfig_mutex); + + /* + * Abort and release device if we no longer have the overwrite + * flag set. It means the work has been canceled. + */ + if (!test_bit(NDD_WORK_PENDING, &nvdimm->flags)) + return; + + tmo = nvdimm->sec.overwrite_tmo; + + if (!nvdimm->sec.ops || !nvdimm->sec.ops->query_overwrite + || nvdimm->sec.state < 0) + return; + + rc = nvdimm->sec.ops->query_overwrite(nvdimm); + if (rc == -EBUSY) { + + /* setup delayed work again */ + tmo += 10; + queue_delayed_work(system_wq, &nvdimm->dwork, tmo * HZ); + nvdimm->sec.overwrite_tmo = min(15U * 60U, tmo); + return; + } + + if (rc < 0) + dev_warn(&nvdimm->dev, "overwrite failed\n"); + else + dev_dbg(&nvdimm->dev, "overwrite completed\n"); + + if (nvdimm->sec.overwrite_state) + sysfs_notify_dirent(nvdimm->sec.overwrite_state); + nvdimm->sec.overwrite_tmo = 0; + clear_bit(NDD_SECURITY_OVERWRITE, &nvdimm->flags); + clear_bit(NDD_WORK_PENDING, &nvdimm->flags); + put_device(&nvdimm->dev); + nvdimm->sec.state = nvdimm_security_state(nvdimm); +} + +void nvdimm_security_overwrite_query(struct work_struct *work) +{ + struct nvdimm *nvdimm = + container_of(work, typeof(*nvdimm), dwork.work); + + nvdimm_bus_lock(&nvdimm->dev); + __nvdimm_security_overwrite_query(nvdimm); + nvdimm_bus_unlock(&nvdimm->dev); +} diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h index 9a6cb7067dc7..d18885304020 100644 --- a/include/linux/libnvdimm.h +++ b/include/linux/libnvdimm.h @@ -38,6 +38,10 @@ enum { NDD_UNARMED = 1, /* locked memory devices should not be accessed */ NDD_LOCKED = 2, + /* memory under security wipes should not be accessed */ + NDD_SECURITY_OVERWRITE = 3, + /* tracking whether or not there is a pending device reference */ + NDD_WORK_PENDING = 4, /* need to set a limit somewhere, but yes, this is likely overkill */ ND_IOCTL_MAX_BUFLEN = SZ_4M, @@ -182,6 +186,9 @@ struct nvdimm_security_ops { const struct nvdimm_key_data *key_data); int (*erase)(struct nvdimm *nvdimm, const struct nvdimm_key_data *key_data); + int (*overwrite)(struct nvdimm *nvdimm, + const struct nvdimm_key_data *key_data); + int (*query_overwrite)(struct nvdimm *nvdimm); }; void badrange_init(struct badrange *badrange); @@ -219,6 +226,7 @@ static inline struct nvdimm *nvdimm_create(struct nvdimm_bus *nvdimm_bus, cmd_mask, num_flush, flush_wpq, NULL, NULL); } +int nvdimm_security_setup_events(struct nvdimm *nvdimm); const struct nd_cmd_desc *nd_cmd_dimm_desc(int cmd); const struct nd_cmd_desc *nd_cmd_bus_desc(int cmd); u32 nd_cmd_in_size(struct nvdimm *nvdimm, int cmd, @@ -244,6 +252,7 @@ u64 nd_fletcher64(void *addr, size_t len, bool le); void nvdimm_flush(struct nd_region *nd_region); int nvdimm_has_flush(struct nd_region *nd_region); int nvdimm_has_cache(struct nd_region *nd_region); +int nvdimm_in_overwrite(struct nvdimm *nvdimm); static inline int nvdimm_ctl(struct nvdimm *nvdimm, unsigned int cmd, void *buf, unsigned int buf_len, int *cmd_rc) |