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

From: Matthew Garrett
Date: Thu Feb 28 2019 - 18:12:56 EST


From: David Howells <dhowells@xxxxxxxxxx>

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

Suggested-by: Dominik Brodowski <linux@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
cc: linux-pcmcia@xxxxxxxxxxxxxxxxxxx
---
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)
--
2.21.0.352.gf09ad66450-goog