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>
Gbp-Pq: Topic features/all/lockdown
Gbp-Pq: Name 0059-Prohibit-PCMCIA-CIS-storage-when-the-kernel-is-locke.patch

diff --git a/drivers/pcmcia/cistpl.c b/drivers/pcmcia/cistpl.c
index 55ef7d1fd8da139caae507d928dd9f0b6fc70373..193e4f7b73b1d4b75a66ad8ab7830497eea9cd77 100644 (file)
--- a/drivers/pcmcia/cistpl.c
+++ b/drivers/pcmcia/cistpl.c
@@ -1578,6 +1578,11 @@ static ssize_t pccard_store_cis(struct file *filp, struct kobject *kobj,
        struct pcmcia_socket *s;
        int error;
 
+       if (kernel_is_locked_down()) {
+               pr_err("Direct CIS storage isn't permitted when the kernel is locked down\n");
+               return -EPERM;
+       }
+
        s = to_socket(container_of(kobj, struct device, kobj));
 
        if (off)