[PATCH v5 07/12] cxl/mbox: Block inject and clear poison opcodes in raw mode

[alison.schofield@intel.com]

From: Alison Schofield <alison.schofield@intel.com>

Inject and clear poison are commands intended for debug environments,
and can cause data corruption if issued without validation. They are
kernel exclusive commands not available to userspace through ioctls,
but could be submitted via the raw mode ioctl.

Add inject and clear poison to the cxl_disabled_raw_commands[] list.
Attempts by userspace to issue either command via the RAW ioctl fail
with -EPERM.

Signed-off-by: Alison Schofield <alison.schofield@intel.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
 drivers/cxl/core/mbox.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c
index a8369ef56f61..b380208f85c2 100644
--- a/drivers/cxl/core/mbox.c
+++ b/drivers/cxl/core/mbox.c
@@ -89,6 +89,9 @@ static struct cxl_mem_command cxl_mem_commands[CXL_MEM_COMMAND_ID_MAX] = {
  *
  * CXL_MBOX_OP_[GET_]SCAN_MEDIA: The kernel provides a native error list that
  * is kept up to date with patrol notifications and error management.
+ *
+ * CXL_MBOX_OP_[INJECT|CLEAR]_POISON: The kernel provides a debugfs interface
+ * to these commands. See: Documentation/ABI/testing/debugfs-cxl
  */
 static u16 cxl_disabled_raw_commands[] = {
 	CXL_MBOX_OP_ACTIVATE_FW,
@@ -97,6 +100,8 @@ static u16 cxl_disabled_raw_commands[] = {
 	CXL_MBOX_OP_SET_SHUTDOWN_STATE,
 	CXL_MBOX_OP_SCAN_MEDIA,
 	CXL_MBOX_OP_GET_SCAN_MEDIA,
+	CXL_MBOX_OP_INJECT_POISON,
+	CXL_MBOX_OP_CLEAR_POISON,
 };
 
 /*
-- 
2.37.3