[PATCH 18/27] Prohibit PCMCIA CIS storage when the kernel is locked down

Matthew Garrett matthewgarrett at google.com
Wed Mar 6 23:59:04 UTC 2019

From: David Howells <dhowells at redhat.com>

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

Suggested-by: Dominik Brodowski <linux at dominikbrodowski.net>
Signed-off-by: David Howells <dhowells at redhat.com>
cc: linux-pcmcia at lists.infradead.org
Signed-off-by: Matthew Garrett <matthewgarrett at google.com>
 drivers/pcmcia/cistpl.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/pcmcia/cistpl.c b/drivers/pcmcia/cistpl.c
index ac0672b8dfca..8adf092d0e18 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)

More information about the Linux-security-module-archive mailing list