From 3f19cad3fa0d0fff18ee126f03a80420ae7bcbc9 Mon Sep 17 00:00:00 2001
From: David Howells <dhowells@redhat.com>
Date: Mon, 19 Aug 2019 17:17:53 -0700
Subject: lockdown: Prohibit PCMCIA CIS storage when the kernel is locked down

Prohibit replacement of the PCMCIA Card Information Structure when the
kernel is locked down.

Suggested-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Matthew Garrett <mjg59@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: James Morris <jmorris@namei.org>
---
 drivers/pcmcia/cistpl.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'drivers/pcmcia/cistpl.c')

diff --git a/drivers/pcmcia/cistpl.c b/drivers/pcmcia/cistpl.c
index abd029945cc8..629359fe3513 100644
--- a/drivers/pcmcia/cistpl.c
+++ b/drivers/pcmcia/cistpl.c
@@ -21,6 +21,7 @@
 #include <linux/pci.h>
 #include <linux/ioport.h>
 #include <linux/io.h>
+#include <linux/security.h>
 #include <asm/byteorder.h>
 #include <asm/unaligned.h>
 
@@ -1575,6 +1576,10 @@ static ssize_t pccard_store_cis(struct file *filp, struct kobject *kobj,
 	struct pcmcia_socket *s;
 	int error;
 
+	error = security_locked_down(LOCKDOWN_PCMCIA_CIS);
+	if (error)
+		return error;
+
 	s = to_socket(container_of(kobj, struct device, kobj));
 
 	if (off)
-- 
cgit v1.2.3-59-g8ed1b