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x86/ima: Check EFI_RUNTIME_SERVICES before using

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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: 399574c64e ("x86/ima: retry detecting secure boot mode")
Cc: stable@vger.kernel.org  (linux-5.0)
Signed-off-by: Scott Wood <swood@redhat.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
This commit is contained in:
Scott Wood 2019-04-23 17:48:07 -05:00 committed by Mimi Zohar
parent a188339ca5
commit 558b523d46
1 changed files with 5 additions and 0 deletions
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5
arch/x86/kernel/ima_arch.c
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@ -18,6 +18,11 @@ 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);