lkml.org 
[lkml]   [2016]   [Feb]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] arm64/efi: check SetupMode when determining Secure Boot status
Date
According to the UEFI specification, the platform is operating in secure
boot mode if SetupMode is 0 and SecureBoot is 1, and cannot operate in
secure boot mode if SetupMode is set to 1. Check the value of SetupMode
when determining the state of Secure Boot.

Signed-off-by: Linn Crosetto <linn@hpe.com>
---
drivers/firmware/efi/libstub/arm-stub.c | 34 +++++++++++++++++++++------------
1 file changed, 22 insertions(+), 12 deletions(-)

diff --git a/drivers/firmware/efi/libstub/arm-stub.c b/drivers/firmware/efi/libstub/arm-stub.c
index 3397902..7ef2e20 100644
--- a/drivers/firmware/efi/libstub/arm-stub.c
+++ b/drivers/firmware/efi/libstub/arm-stub.c
@@ -20,26 +20,36 @@

static int efi_secureboot_enabled(efi_system_table_t *sys_table_arg)
{
- static efi_guid_t const var_guid = EFI_GLOBAL_VARIABLE_GUID;
- static efi_char16_t const var_name[] = {
+ static efi_char16_t const sb_var_name[] = {
'S', 'e', 'c', 'u', 'r', 'e', 'B', 'o', 'o', 't', 0 };
+ static efi_char16_t const sm_var_name[] = {
+ 'S', 'e', 't', 'u', 'p', 'M', 'o', 'd', 'e', 0 };

+ efi_guid_t var_guid = EFI_GLOBAL_VARIABLE_GUID;
efi_get_variable_t *f_getvar = sys_table_arg->runtime->get_variable;
- unsigned long size = sizeof(u8);
- efi_status_t status;
u8 val;
+ unsigned long size = sizeof(val);
+ efi_status_t status;

- status = f_getvar((efi_char16_t *)var_name, (efi_guid_t *)&var_guid,
+ status = f_getvar((efi_char16_t *)sb_var_name, (efi_guid_t *)&var_guid,
NULL, &size, &val);

- switch (status) {
- case EFI_SUCCESS:
- return val;
- case EFI_NOT_FOUND:
+ if (status != EFI_SUCCESS)
return 0;
- default:
- return 1;
- }
+
+ if (val == 0)
+ return 0;
+
+ status = f_getvar((efi_char16_t *)sm_var_name, (efi_guid_t *)&var_guid,
+ NULL, &size, &val);
+
+ if (status != EFI_SUCCESS)
+ return 0;
+
+ if (val == 1)
+ return 0;
+
+ return 1;
}

efi_status_t efi_open_volume(efi_system_table_t *sys_table_arg,
--
2.1.4
\
 
 \ /
  Last update: 2016-02-24 01:41    [W:0.339 / U:0.120 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site