From: Matthew Garrett
Git-commit: Not yet, reviewing
Patch-mainline: Not yet, reviewing
References: fate#314486
Target: SLE-11 SP3
From: Josh Boyer
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
Acked-by: Lee, Chun-Yi
---
kernel/cred.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
--- 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
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