linux-kernel - [PATCH 22/24] Prohibit PCMCIA CIS storage when the kernel is locked down

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Date:   Wed, 05 Apr 2017 21:17:45 +0100
From:   David Howells <dhowells@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     gnomes@...rguk.ukuu.org.uk, linux-efi@...r.kernel.org,
        matthew.garrett@...ula.com, gregkh@...uxfoundation.org,
        linux-pcmcia@...ts.infradead.org, dhowells@...hat.com,
        linux-security-module@...r.kernel.org, keyrings@...r.kernel.org
Subject: [PATCH 22/24] 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@...inikbrodowski.net>
Signed-off-by: David Howells <dhowells@...hat.com>
cc: linux-pcmcia@...ts.infradead.org
---

 drivers/pcmcia/cistpl.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/pcmcia/cistpl.c b/drivers/pcmcia/cistpl.c
index 55ef7d1fd8da..193e4f7b73b1 100644
--- a/drivers/pcmcia/cistpl.c
+++ b/drivers/pcmcia/cistpl.c
@@ -1578,6 +1578,11 @@ static ssize_t pccard_store_cis(struct file *filp, struct kobject *kobj,
 	struct pcmcia_socket *s;
 	int error;
 
+	if (kernel_is_locked_down()) {
+		pr_err("Direct CIS storage isn't permitted when the kernel is locked down\n");
+		return -EPERM;
+	}
+
 	s = to_socket(container_of(kobj, struct device, kobj));
 
 	if (off)