Checking efi_enabled(EFI_BOOT) is not sufficient to ensure that
EFI runtime services are available, e.g. if efi=noruntime is used.
Without this, I get an oops on a PREEMPT_RT kernel where efi=noruntime is
the default.
Fixes: 399574c64eaf94e8 ("x86/ima: retry detecting secure boot mode")
Signed-off-by: Scott Wood <swood@xxxxxxxxxx>
---
arch/x86/kernel/ima_arch.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/arch/x86/kernel/ima_arch.c b/arch/x86/kernel/ima_arch.c
index e47cd9390ab4..2a2e87717bad 100644
--- a/arch/x86/kernel/ima_arch.c
+++ b/arch/x86/kernel/ima_arch.c
@@ -17,6 +17,11 @@ static enum efi_secureboot_mode get_sb_mode(void)
size = sizeof(secboot);
+ if (!efi_enabled(EFI_RUNTIME_SERVICES)) {
+ pr_info("ima: secureboot mode unknown, no efi\n");
+ return efi_secureboot_mode_unknown;
+ }
+
/* Get variable contents into buffer */
status = efi.get_variable(efi_SecureBoot_name, &efi_variable_guid,
NULL, &size, &secboot);
--
1.8.3.1
