[PATCH 5.14 22/23] cxl/pci: Fix lockdown level

From: Greg Kroah-Hartman
Date: Fri Sep 10 2021 - 08:31:33 EST

From: Dan Williams <dan.j.williams@xxxxxxxxx>

commit 9e56614c44b994b78fc9fcb2070bcbe3f5df0d7b upstream.

A proposed rework of security_locked_down() users identified that the
cxl_pci driver was passing the wrong lockdown_reason. Update
cxl_mem_raw_command_allowed() to fail raw command access when raw pci
access is also disabled.

Fixes: 13237183c735 ("cxl/mem: Add a "RAW" send command")
Cc: Ben Widawsky <ben.widawsky@xxxxxxxxx>
Cc: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Cc: Ondrej Mosnacek <omosnace@xxxxxxxxxx>
Cc: Paul Moore <paul@xxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/163072204525.2250120.16615792476976546735.stgit@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
drivers/cxl/pci.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/cxl/pci.c
+++ b/drivers/cxl/pci.c
@@ -568,7 +568,7 @@ static bool cxl_mem_raw_command_allowed(
return false;

- if (security_locked_down(LOCKDOWN_NONE))
+ if (security_locked_down(LOCKDOWN_PCI_ACCESS))
return false;

if (cxl_raw_allow_all)