linux-kernel - [PATCH V31 16/25] Prohibit PCMCIA CIS storage when the kernel is locked down

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Message-Id: <20190326182742.16950-17-matthewgarrett@google.com>
Date:   Tue, 26 Mar 2019 11:27:32 -0700
From:   Matthew Garrett <matthewgarrett@...gle.com>
To:     jmorris@...ei.org
Cc:     linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org, dhowells@...hat.com,
        linux-api@...r.kernel.org, luto@...nel.org,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        Matthew Garrett <mjg59@...gle.com>
Subject: [PATCH V31 16/25] Prohibit PCMCIA CIS storage when the kernel is
 locked down

From: David Howells <dhowells@...hat.com>

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>
Signed-off-by: Matthew Garrett <mjg59@...gle.com>
---
 drivers/pcmcia/cistpl.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/pcmcia/cistpl.c b/drivers/pcmcia/cistpl.c
index ac0672b8dfca..9e23300a55e5 100644
--- a/drivers/pcmcia/cistpl.c
+++ b/drivers/pcmcia/cistpl.c
@@ -1578,6 +1578,10 @@ 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",
+				  LOCKDOWN_INTEGRITY))
+		return -EPERM;
+
 	s = to_socket(container_of(kobj, struct device, kobj));
 
 	if (off)
-- 
2.21.0.392.gf8f6787159e-goog