[PATCH 3/5] cxl/pmem: Enforce keyctl ABI for PMEM security

[Dan Williams <dan.j.williams@intel.com>]

Preclude the possibility of user tooling sending device secrets in the
clear into the kernel by marking the security commands as exclusive.
This mandates the usage of the keyctl ABI for managing the device
passphrase.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
 drivers/cxl/core/mbox.c |   10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c
index 8747db329087..35dd889f1d3a 100644
--- a/drivers/cxl/core/mbox.c
+++ b/drivers/cxl/core/mbox.c
@@ -704,6 +704,16 @@ int cxl_enumerate_cmds(struct cxl_dev_state *cxlds)
 		rc = 0;
 	}
 
+	/*
+	 * Setup permanently kernel exclusive commands, i.e. the
+	 * mechanism is driven through sysfs, keyctl, etc...
+	 */
+	set_bit(CXL_MEM_COMMAND_ID_SET_PASSPHRASE, cxlds->exclusive_cmds);
+	set_bit(CXL_MEM_COMMAND_ID_DISABLE_PASSPHRASE, cxlds->exclusive_cmds);
+	set_bit(CXL_MEM_COMMAND_ID_UNLOCK, cxlds->exclusive_cmds);
+	set_bit(CXL_MEM_COMMAND_ID_PASSPHRASE_SECURE_ERASE,
+		cxlds->exclusive_cmds);
+
 out:
 	kvfree(gsl);
 	return rc;