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Date: Wed, 14 Oct 2020 18:40:31 +0800
From: Chester Lin <clin@...e.com>
To: zohar@...ux.ibm.com, ardb@...nel.org, catalin.marinas@....com,
will@...nel.org, tglx@...utronix.de, mingo@...hat.com,
bp@...en8.de, hpa@...or.com, vincenzo.frascino@....com,
mark.rutland@....com, samitolvanen@...gle.com, masahiroy@...nel.org
CC: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
x86@...nel.org, linux-integrity@...r.kernel.org,
linux-efi@...r.kernel.org, jlee@...e.com, clin@...e.com
Subject: [PATCH v2 1/2] efi: add secure boot get helper
Separate the get_sb_mode() from arch/x86 and treat it as a common function
[rename to efi_get_secureboot_mode] so all EFI-based architectures can
reuse the same logic.
Signed-off-by: Chester Lin <clin@...e.com>
---
arch/x86/kernel/ima_arch.c | 47 ++------------------------------------
drivers/firmware/efi/efi.c | 43 ++++++++++++++++++++++++++++++++++
include/linux/efi.h | 5 ++++
3 files changed, 50 insertions(+), 45 deletions(-)
diff --git a/arch/x86/kernel/ima_arch.c b/arch/x86/kernel/ima_arch.c
index 7dfb1e808928..ed4623ecda6e 100644
--- a/arch/x86/kernel/ima_arch.c
+++ b/arch/x86/kernel/ima_arch.c
@@ -8,49 +8,6 @@
extern struct boot_params boot_params;
-static enum efi_secureboot_mode get_sb_mode(void)
-{
- efi_guid_t efi_variable_guid = EFI_GLOBAL_VARIABLE_GUID;
- efi_status_t status;
- unsigned long size;
- u8 secboot, setupmode;
-
- size = sizeof(secboot);
-
- if (!efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE)) {
- pr_info("ima: secureboot mode unknown, no efi\n");
- return efi_secureboot_mode_unknown;
- }
-
- /* Get variable contents into buffer */
- status = efi.get_variable(L"SecureBoot", &efi_variable_guid,
- NULL, &size, &secboot);
- if (status == EFI_NOT_FOUND) {
- pr_info("ima: secureboot mode disabled\n");
- return efi_secureboot_mode_disabled;
- }
-
- if (status != EFI_SUCCESS) {
- pr_info("ima: secureboot mode unknown\n");
- return efi_secureboot_mode_unknown;
- }
-
- size = sizeof(setupmode);
- status = efi.get_variable(L"SetupMode", &efi_variable_guid,
- NULL, &size, &setupmode);
-
- if (status != EFI_SUCCESS) /* ignore unknown SetupMode */
- setupmode = 0;
-
- if (secboot == 0 || setupmode == 1) {
- pr_info("ima: secureboot mode disabled\n");
- return efi_secureboot_mode_disabled;
- }
-
- pr_info("ima: secureboot mode enabled\n");
- return efi_secureboot_mode_enabled;
-}
-
bool arch_ima_get_secureboot(void)
{
static enum efi_secureboot_mode sb_mode;
@@ -60,7 +17,7 @@ bool arch_ima_get_secureboot(void)
sb_mode = boot_params.secure_boot;
if (sb_mode == efi_secureboot_mode_unset)
- sb_mode = get_sb_mode();
+ sb_mode = efi_get_secureboot_mode();
initialized = true;
}
@@ -70,7 +27,7 @@ bool arch_ima_get_secureboot(void)
return false;
}
-/* secureboot arch rules */
+/* secure and trusted boot arch rules */
static const char * const sb_arch_rules[] = {
#if !IS_ENABLED(CONFIG_KEXEC_SIG)
"appraise func=KEXEC_KERNEL_CHECK appraise_type=imasig",
diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index 5e5480a0a32d..68ffa6a069c0 100644
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -1022,3 +1022,46 @@ static int __init register_update_efi_random_seed(void)
}
late_initcall(register_update_efi_random_seed);
#endif
+
+enum efi_secureboot_mode efi_get_secureboot_mode(void)
+{
+ efi_guid_t efi_variable_guid = EFI_GLOBAL_VARIABLE_GUID;
+ efi_status_t status;
+ unsigned long size;
+ u8 secboot, setupmode;
+
+ size = sizeof(secboot);
+
+ if (!efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE)) {
+ pr_info("ima: secureboot mode unknown, no efi\n");
+ return efi_secureboot_mode_unknown;
+ }
+
+ /* Get variable contents into buffer */
+ status = efi.get_variable(L"SecureBoot", &efi_variable_guid,
+ NULL, &size, &secboot);
+ if (status == EFI_NOT_FOUND) {
+ pr_info("ima: secureboot mode disabled\n");
+ return efi_secureboot_mode_disabled;
+ }
+
+ if (status != EFI_SUCCESS) {
+ pr_info("ima: secureboot mode unknown\n");
+ return efi_secureboot_mode_unknown;
+ }
+
+ size = sizeof(setupmode);
+ status = efi.get_variable(L"SetupMode", &efi_variable_guid,
+ NULL, &size, &setupmode);
+
+ if (status != EFI_SUCCESS) /* ignore unknown SetupMode */
+ setupmode = 0;
+
+ if (secboot == 0 || setupmode == 1) {
+ pr_info("ima: secureboot mode disabled\n");
+ return efi_secureboot_mode_disabled;
+ }
+
+ pr_info("ima: secureboot mode enabled\n");
+ return efi_secureboot_mode_enabled;
+}
diff --git a/include/linux/efi.h b/include/linux/efi.h
index d7c0e73af2b9..a73e5ae04672 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -1076,8 +1076,13 @@ static inline int efi_runtime_map_copy(void *buf, size_t bufsz)
#ifdef CONFIG_EFI
extern bool efi_runtime_disabled(void);
+extern enum efi_secureboot_mode efi_get_secureboot_mode(void);
#else
static inline bool efi_runtime_disabled(void) { return true; }
+static inline enum efi_secureboot_mode efi_get_secureboot_mode(void)
+{
+ return efi_secureboot_mode_disabled;
+}
#endif
extern void efi_call_virt_check_flags(unsigned long flags, const char *call);
--
2.26.1
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