From: David Howells <dhowells@redhat.com>
Date: Wed, 8 Nov 2017 15:11:35 +0000 (+0000)
Subject: Prohibit PCMCIA CIS storage when the kernel is locked down
X-Git-Tag: archive/raspbian/4.16.16-2+rpi1^2~28
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=7f9f19e4d150f0b7c6daa4051fe61ba65824a923;p=linux.git

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>
cc: linux-pcmcia@lists.infradead.org

Gbp-Pq: Topic features/all/lockdown
Gbp-Pq: Name 0020-Prohibit-PCMCIA-CIS-storage-when-the-kernel-is-locke.patch
---

diff --git a/drivers/pcmcia/cistpl.c b/drivers/pcmcia/cistpl.c
index 102646fedb5..e46c948d724 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)