integrity: Make arch_ima_get_secureboot integrity-wide

EVM and other LSMs need the ability to query the secure boot status of
the system, without directly calling the IMA arch_ima_get_secureboot
function. Refactor the secure boot status check into a general function
named arch_get_secureboot.

Reported-and-suggested-by: Mimi Zohar <zohar@linux.ibm.com>
Suggested-by: Roberto Sassu <roberto.sassu@huawei.com>
Signed-off-by: Coiby Xu <coxu@redhat.com>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>

2 files changed, 6 insertions, 5 deletions

diff --git a/arch/powerpc/kernel/ima_arch.c b/arch/powerpc/kernel/ima_arch.c
index b7029beed847..0d8892a03526 100644
--- a/arch/powerpc/kernel/ima_arch.c
+++ b/arch/powerpc/kernel/ima_arch.c
@@ -7,11 +7,6 @@
 #include <linux/ima.h>
 #include <asm/secure_boot.h>
 
-bool arch_ima_get_secureboot(void)
-{
-	return is_ppc_secureboot_enabled();
-}
-
 /*
  * The "secure_rules" are enabled only on "secureboot" enabled systems.
  * These rules verify the file signatures against known good values.
diff --git a/arch/powerpc/kernel/secure_boot.c b/arch/powerpc/kernel/secure_boot.c
index 3a28795b4ed8..28436c1599e0 100644
--- a/arch/powerpc/kernel/secure_boot.c
+++ b/arch/powerpc/kernel/secure_boot.c
@@ -5,6 +5,7 @@
  */
 #include <linux/types.h>
 #include <linux/of.h>
+#include <linux/secure_boot.h>
 #include <linux/string_choices.h>
 #include <asm/secure_boot.h>
 
@@ -44,6 +45,11 @@ out:
 	return enabled;
 }
 
+bool arch_get_secureboot(void)
+{
+	return is_ppc_secureboot_enabled();
+}
+
 bool is_ppc_trustedboot_enabled(void)
 {
 	struct device_node *node;