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nvdimm/cxl/pmem: Add support for master passphrase disable security command

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The original nvdimm_security_ops ->disable() only supports user passphrase
for security disable. The CXL spec introduced the disabling of master
passphrase. Add a ->disable_master() callback to support this new operation
and leaving the old ->disable() mechanism alone. A "disable_master" command
is added for the sysfs attribute in order to allow command to be issued
from userspace. ndctl will need enabling in order to utilize this new
operation.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/166983616454.2734609.14204031148234398086.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dave Jiang 2022-11-30 12:22:44 -07:00 committed by Dan Williams
parent 9f01733387
commit dcedadfae2
3 changed files with 46 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
drivers/cxl/security.c
View File

@ -71,8 +71,9 @@ static int cxl_pmem_security_change_key(struct nvdimm *nvdimm,
return rc;
}
static int cxl_pmem_security_disable(struct nvdimm *nvdimm,
const struct nvdimm_key_data *key_data)
static int __cxl_pmem_security_disable(struct nvdimm *nvdimm,
const struct nvdimm_key_data *key_data,
enum nvdimm_passphrase_type ptype)
{
struct cxl_nvdimm *cxl_nvd = nvdimm_provider_data(nvdimm);
struct cxl_memdev *cxlmd = cxl_nvd->cxlmd;
@ -80,7 +81,8 @@ static int cxl_pmem_security_disable(struct nvdimm *nvdimm,
struct cxl_disable_pass dis_pass;
int rc;
dis_pass.type = CXL_PMEM_SEC_PASS_USER;
dis_pass.type = ptype == NVDIMM_MASTER ?
CXL_PMEM_SEC_PASS_MASTER : CXL_PMEM_SEC_PASS_USER;
memcpy(dis_pass.pass, key_data->data, NVDIMM_PASSPHRASE_LEN);
rc = cxl_mbox_send_cmd(cxlds, CXL_MBOX_OP_DISABLE_PASSPHRASE,
@ -88,6 +90,18 @@ static int cxl_pmem_security_disable(struct nvdimm *nvdimm,
return rc;
}
static int cxl_pmem_security_disable(struct nvdimm *nvdimm,
const struct nvdimm_key_data *key_data)
{
return __cxl_pmem_security_disable(nvdimm, key_data, NVDIMM_USER);
}
static int cxl_pmem_security_disable_master(struct nvdimm *nvdimm,
const struct nvdimm_key_data *key_data)
{
return __cxl_pmem_security_disable(nvdimm, key_data, NVDIMM_MASTER);
}
static int cxl_pmem_security_freeze(struct nvdimm *nvdimm)
{
struct cxl_nvdimm *cxl_nvd = nvdimm_provider_data(nvdimm);
@ -155,6 +169,7 @@ static const struct nvdimm_security_ops __cxl_security_ops = {
.freeze = cxl_pmem_security_freeze,
.unlock = cxl_pmem_security_unlock,
.erase = cxl_pmem_security_passphrase_erase,
.disable_master = cxl_pmem_security_disable_master,
};
const struct nvdimm_security_ops *cxl_security_ops = &__cxl_security_ops;

33
drivers/nvdimm/security.c
View File

@ -239,7 +239,8 @@ static int check_security_state(struct nvdimm *nvdimm)
return 0;
}
static int security_disable(struct nvdimm *nvdimm, unsigned int keyid)
static int security_disable(struct nvdimm *nvdimm, unsigned int keyid,
enum nvdimm_passphrase_type pass_type)
{
struct device *dev = &nvdimm->dev;
struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
@ -250,8 +251,13 @@ static int security_disable(struct nvdimm *nvdimm, unsigned int keyid)
/* 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->disable
|| !nvdimm->sec.flags)
if (!nvdimm->sec.ops || !nvdimm->sec.flags)
return -EOPNOTSUPP;
if (pass_type == NVDIMM_USER && !nvdimm->sec.ops->disable)
return -EOPNOTSUPP;
if (pass_type == NVDIMM_MASTER && !nvdimm->sec.ops->disable_master)
return -EOPNOTSUPP;
rc = check_security_state(nvdimm);
@ -263,12 +269,21 @@ static int security_disable(struct nvdimm *nvdimm, unsigned int keyid)
if (!data)
return -ENOKEY;
rc = nvdimm->sec.ops->disable(nvdimm, data);
dev_dbg(dev, "key: %d disable: %s\n", key_serial(key),
if (pass_type == NVDIMM_MASTER) {
rc = nvdimm->sec.ops->disable_master(nvdimm, data);
dev_dbg(dev, "key: %d disable_master: %s\n", key_serial(key),
rc == 0 ? "success" : "fail");
} else {
rc = nvdimm->sec.ops->disable(nvdimm, data);
dev_dbg(dev, "key: %d disable: %s\n", key_serial(key),
rc == 0 ? "success" : "fail");
}
nvdimm_put_key(key);
nvdimm->sec.flags = nvdimm_security_flags(nvdimm, NVDIMM_USER);
if (pass_type == NVDIMM_MASTER)
nvdimm->sec.ext_flags = nvdimm_security_flags(nvdimm, NVDIMM_MASTER);
else
nvdimm->sec.flags = nvdimm_security_flags(nvdimm, NVDIMM_USER);
return rc;
}
@ -473,6 +488,7 @@ void nvdimm_security_overwrite_query(struct work_struct *work)
#define OPS \
C( OP_FREEZE, "freeze", 1), \
C( OP_DISABLE, "disable", 2), \
C( OP_DISABLE_MASTER, "disable_master", 2), \
C( OP_UPDATE, "update", 3), \
C( OP_ERASE, "erase", 2), \
C( OP_OVERWRITE, "overwrite", 2), \
@ -524,7 +540,10 @@ ssize_t nvdimm_security_store(struct device *dev, const char *buf, size_t len)
rc = nvdimm_security_freeze(nvdimm);
} else if (i == OP_DISABLE) {
dev_dbg(dev, "disable %u\n", key);
rc = security_disable(nvdimm, key);
rc = security_disable(nvdimm, key, NVDIMM_USER);
} else if (i == OP_DISABLE_MASTER) {
dev_dbg(dev, "disable_master %u\n", key);
rc = security_disable(nvdimm, key, NVDIMM_MASTER);
} 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

2
include/linux/libnvdimm.h
View File

@ -183,6 +183,8 @@ struct nvdimm_security_ops {
int (*overwrite)(struct nvdimm *nvdimm,
const struct nvdimm_key_data *key_data);
int (*query_overwrite)(struct nvdimm *nvdimm);
int (*disable_master)(struct nvdimm *nvdimm,
const struct nvdimm_key_data *key_data);
};
enum nvdimm_fwa_state {