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Subject: [PATCH 16/24] Prohibit PCMCIA CIS storage when the kernel is locked
 down
From:   David Howells <dhowells@redhat.com>
To:     torvalds@linux-foundation.org
Cc:     linux-man@vger.kernel.org, linux-api@vger.kernel.org,
        jmorris@namei.org, linux-kernel@vger.kernel.org,
        dhowells@redhat.com, linux-security-module@vger.kernel.org
Date:   Wed, 11 Apr 2018 17:26:23 +0100
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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>
cc: linux-pcmcia@lists.infradead.org
---

 drivers/pcmcia/cistpl.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/pcmcia/cistpl.c b/drivers/pcmcia/cistpl.c
index 102646fedb56..e46c948d7246 100644
--- a/drivers/pcmcia/cistpl.c
+++ b/drivers/pcmcia/cistpl.c
@@ -1578,6 +1578,9 @@ static ssize_t pccard_store_cis(struct file *filp, struct kobject *kobj,
 	struct pcmcia_socket *s;
 	int error;
 
+	if (kernel_is_locked_down("Direct PCMCIA CIS storage"))
+		return -EPERM;
+
 	s = to_socket(container_of(kobj, struct device, kobj));
 
 	if (off)