diff options
Diffstat (limited to 'drivers/nvdimm/security.c')
-rw-r--r-- | drivers/nvdimm/security.c | 90 |
1 files changed, 86 insertions, 4 deletions
diff --git a/drivers/nvdimm/security.c b/drivers/nvdimm/security.c index 2166e627383a..9e45b207ff01 100644 --- a/drivers/nvdimm/security.c +++ b/drivers/nvdimm/security.c @@ -235,7 +235,7 @@ static int check_security_state(struct nvdimm *nvdimm) return 0; } -int nvdimm_security_disable(struct nvdimm *nvdimm, unsigned int keyid) +static int security_disable(struct nvdimm *nvdimm, unsigned int keyid) { struct device *dev = &nvdimm->dev; struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); @@ -268,7 +268,7 @@ int nvdimm_security_disable(struct nvdimm *nvdimm, unsigned int keyid) return rc; } -int nvdimm_security_update(struct nvdimm *nvdimm, unsigned int keyid, +static int security_update(struct nvdimm *nvdimm, unsigned int keyid, unsigned int new_keyid, enum nvdimm_passphrase_type pass_type) { @@ -318,7 +318,7 @@ int nvdimm_security_update(struct nvdimm *nvdimm, unsigned int keyid, return rc; } -int nvdimm_security_erase(struct nvdimm *nvdimm, unsigned int keyid, +static int security_erase(struct nvdimm *nvdimm, unsigned int keyid, enum nvdimm_passphrase_type pass_type) { struct device *dev = &nvdimm->dev; @@ -360,7 +360,7 @@ int nvdimm_security_erase(struct nvdimm *nvdimm, unsigned int keyid, return rc; } -int nvdimm_security_overwrite(struct nvdimm *nvdimm, unsigned int keyid) +static int security_overwrite(struct nvdimm *nvdimm, unsigned int keyid) { struct device *dev = &nvdimm->dev; struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); @@ -465,3 +465,85 @@ void nvdimm_security_overwrite_query(struct work_struct *work) __nvdimm_security_overwrite_query(nvdimm); nvdimm_bus_unlock(&nvdimm->dev); } + +#define OPS \ + C( OP_FREEZE, "freeze", 1), \ + C( OP_DISABLE, "disable", 2), \ + C( OP_UPDATE, "update", 3), \ + C( OP_ERASE, "erase", 2), \ + C( OP_OVERWRITE, "overwrite", 2), \ + C( OP_MASTER_UPDATE, "master_update", 3), \ + C( OP_MASTER_ERASE, "master_erase", 2) +#undef C +#define C(a, b, c) a +enum nvdimmsec_op_ids { OPS }; +#undef C +#define C(a, b, c) { b, c } +static struct { + const char *name; + int args; +} ops[] = { OPS }; +#undef C + +#define SEC_CMD_SIZE 32 +#define KEY_ID_SIZE 10 + +ssize_t nvdimm_security_store(struct device *dev, const char *buf, size_t len) +{ + struct nvdimm *nvdimm = to_nvdimm(dev); + ssize_t rc; + char cmd[SEC_CMD_SIZE+1], keystr[KEY_ID_SIZE+1], + nkeystr[KEY_ID_SIZE+1]; + unsigned int key, newkey; + int i; + + rc = sscanf(buf, "%"__stringify(SEC_CMD_SIZE)"s" + " %"__stringify(KEY_ID_SIZE)"s" + " %"__stringify(KEY_ID_SIZE)"s", + cmd, keystr, nkeystr); + if (rc < 1) + return -EINVAL; + for (i = 0; i < ARRAY_SIZE(ops); i++) + if (sysfs_streq(cmd, ops[i].name)) + break; + if (i >= ARRAY_SIZE(ops)) + return -EINVAL; + if (ops[i].args > 1) + rc = kstrtouint(keystr, 0, &key); + if (rc >= 0 && ops[i].args > 2) + rc = kstrtouint(nkeystr, 0, &newkey); + if (rc < 0) + return rc; + + if (i == OP_FREEZE) { + dev_dbg(dev, "freeze\n"); + rc = nvdimm_security_freeze(nvdimm); + } else if (i == OP_DISABLE) { + dev_dbg(dev, "disable %u\n", key); + rc = security_disable(nvdimm, key); + } else if (i == OP_UPDATE || i == OP_MASTER_UPDATE) { + dev_dbg(dev, "%s %u %u\n", ops[i].name, key, newkey); + rc = 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 = 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 = security_overwrite(nvdimm, key); + } else + return -EINVAL; + + if (rc == 0) + rc = len; + return rc; +} |