From: Josh Boyer <jwboyer@xxxxxxxxxx>
This forcibly drops CAP_COMPROMISE_KERNEL from both cap_permitted and cap_bset
in the init_cred struct, which everything else inherits from. This works on
any machine and can be used to develop even if the box doesn't have UEFI.
Signed-off-by: Josh Boyer <jwboyer@xxxxxxxxxx>
---
kernel/cred.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/kernel/cred.c b/kernel/cred.c
index de728ac..7e6e83f 100644
--- a/kernel/cred.c
+++ b/kernel/cred.c
@@ -623,6 +623,23 @@ void __init cred_init(void)
0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
}
+void __init secureboot_enable()
+{
+ pr_info("Secure boot enabled\n");
+ cap_lower((&init_cred)->cap_bset, CAP_COMPROMISE_KERNEL);
+ cap_lower((&init_cred)->cap_permitted, CAP_COMPROMISE_KERNEL);
+}
+
+/* Dummy Secure Boot enable option to fake out UEFI SB=1 */
+static int __init secureboot_enable_opt(char *str)
+{
+ int sb_enable = !!simple_strtol(str, NULL, 0);
+ if (sb_enable)
+ secureboot_enable();
+ return 1;
+}
+__setup("secureboot_enable=", secureboot_enable_opt);
+
/**
* prepare_kernel_cred - Prepare a set of credentials for a kernel service
* @daemon: A userspace daemon to be used as a reference
--
1.7.11.4
--
To unsubscribe from this list: send the line "unsubscribe linux-efi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
