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

Matthew Garrett matthewgarrett at google.com
Tue Mar 26 18:27:32 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>
Signed-off-by: Matthew Garrett <mjg59 at google.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",
+		return -EPERM;
 	s = to_socket(container_of(kobj, struct device, kobj));
 	if (off)

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