diff options
Diffstat (limited to 'lib/efi_loader/efi_variable.c')
-rw-r--r-- | lib/efi_loader/efi_variable.c | 159 |
1 files changed, 0 insertions, 159 deletions
diff --git a/lib/efi_loader/efi_variable.c b/lib/efi_loader/efi_variable.c index eab5f005da..64dc3d6df9 100644 --- a/lib/efi_loader/efi_variable.c +++ b/lib/efi_loader/efi_variable.c @@ -19,165 +19,6 @@ #include <linux/compat.h> #include <u-boot/crc.h> -enum efi_secure_mode { - EFI_MODE_SETUP, - EFI_MODE_USER, - EFI_MODE_AUDIT, - EFI_MODE_DEPLOYED, -}; - -static bool efi_secure_boot; -static enum efi_secure_mode efi_secure_mode; -static u8 efi_vendor_keys; - -/** - * efi_set_secure_state - modify secure boot state variables - * @secure_boot: value of SecureBoot - * @setup_mode: value of SetupMode - * @audit_mode: value of AuditMode - * @deployed_mode: value of DeployedMode - * - * Modify secure boot status related variables as indicated. - * - * Return: status code - */ -static efi_status_t efi_set_secure_state(u8 secure_boot, u8 setup_mode, - u8 audit_mode, u8 deployed_mode) -{ - efi_status_t ret; - const u32 attributes_ro = EFI_VARIABLE_BOOTSERVICE_ACCESS | - EFI_VARIABLE_RUNTIME_ACCESS | - EFI_VARIABLE_READ_ONLY; - const u32 attributes_rw = EFI_VARIABLE_BOOTSERVICE_ACCESS | - EFI_VARIABLE_RUNTIME_ACCESS; - - efi_secure_boot = secure_boot; - - ret = efi_set_variable_int(L"SecureBoot", &efi_global_variable_guid, - attributes_ro, sizeof(secure_boot), - &secure_boot, false); - if (ret != EFI_SUCCESS) - goto err; - - ret = efi_set_variable_int(L"SetupMode", &efi_global_variable_guid, - attributes_ro, sizeof(setup_mode), - &setup_mode, false); - if (ret != EFI_SUCCESS) - goto err; - - ret = efi_set_variable_int(L"AuditMode", &efi_global_variable_guid, - audit_mode || setup_mode ? - attributes_ro : attributes_rw, - sizeof(audit_mode), &audit_mode, false); - if (ret != EFI_SUCCESS) - goto err; - - ret = efi_set_variable_int(L"DeployedMode", - &efi_global_variable_guid, - audit_mode || deployed_mode || setup_mode ? - attributes_ro : attributes_rw, - sizeof(deployed_mode), &deployed_mode, - false); -err: - return ret; -} - -/** - * efi_transfer_secure_state - handle a secure boot state transition - * @mode: new state - * - * Depending on @mode, secure boot related variables are updated. - * Those variables are *read-only* for users, efi_set_variable_int() - * is called here. - * - * Return: status code - */ -static efi_status_t efi_transfer_secure_state(enum efi_secure_mode mode) -{ - efi_status_t ret; - - EFI_PRINT("Switching secure state from %d to %d\n", efi_secure_mode, - mode); - - if (mode == EFI_MODE_DEPLOYED) { - ret = efi_set_secure_state(1, 0, 0, 1); - if (ret != EFI_SUCCESS) - goto err; - } else if (mode == EFI_MODE_AUDIT) { - ret = efi_set_variable_int(L"PK", &efi_global_variable_guid, - EFI_VARIABLE_BOOTSERVICE_ACCESS | - EFI_VARIABLE_RUNTIME_ACCESS, - 0, NULL, false); - if (ret != EFI_SUCCESS) - goto err; - - ret = efi_set_secure_state(0, 1, 1, 0); - if (ret != EFI_SUCCESS) - goto err; - } else if (mode == EFI_MODE_USER) { - ret = efi_set_secure_state(1, 0, 0, 0); - if (ret != EFI_SUCCESS) - goto err; - } else if (mode == EFI_MODE_SETUP) { - ret = efi_set_secure_state(0, 1, 0, 0); - if (ret != EFI_SUCCESS) - goto err; - } else { - return EFI_INVALID_PARAMETER; - } - - efi_secure_mode = mode; - - return EFI_SUCCESS; - -err: - /* TODO: What action should be taken here? */ - printf("ERROR: Secure state transition failed\n"); - return ret; -} - -/** - * efi_init_secure_state - initialize secure boot state - * - * Return: status code - */ -static efi_status_t efi_init_secure_state(void) -{ - enum efi_secure_mode mode = EFI_MODE_SETUP; - efi_uintn_t size = 0; - efi_status_t ret; - - ret = efi_get_variable_int(L"PK", &efi_global_variable_guid, - NULL, &size, NULL, NULL); - if (ret == EFI_BUFFER_TOO_SMALL) { - if (IS_ENABLED(CONFIG_EFI_SECURE_BOOT)) - mode = EFI_MODE_USER; - } - - ret = efi_transfer_secure_state(mode); - if (ret != EFI_SUCCESS) - return ret; - - /* As we do not provide vendor keys this variable is always 0. */ - ret = efi_set_variable_int(L"VendorKeys", - &efi_global_variable_guid, - EFI_VARIABLE_BOOTSERVICE_ACCESS | - EFI_VARIABLE_RUNTIME_ACCESS | - EFI_VARIABLE_READ_ONLY, - sizeof(efi_vendor_keys), - &efi_vendor_keys, false); - return ret; -} - -/** - * efi_secure_boot_enabled - return if secure boot is enabled or not - * - * Return: true if enabled, false if disabled - */ -bool efi_secure_boot_enabled(void) -{ - return efi_secure_boot; -} #ifdef CONFIG_EFI_SECURE_BOOT static u8 pkcs7_hdr[] = { |