diff options
| -rw-r--r-- | fallback.c | 81 |
1 files changed, 81 insertions, 0 deletions
@@ -9,6 +9,8 @@ #include "shim.h" +#define NO_REBOOT L"FB_NO_REBOOT" + EFI_LOADED_IMAGE *this_image = NULL; int @@ -971,6 +973,65 @@ try_start_first_option(EFI_HANDLE parent_image_handle) return efi_status; } +static UINT32 +get_fallback_no_reboot(void) +{ + EFI_STATUS efi_status; + UINT32 no_reboot; + UINTN size = sizeof(UINT32); + + efi_status = gRT->GetVariable(NO_REBOOT, &SHIM_LOCK_GUID, + NULL, &size, &no_reboot); + if (!EFI_ERROR(efi_status)) { + return no_reboot; + } + return 0; +} + +static EFI_STATUS +set_fallback_no_reboot(void) +{ + EFI_STATUS efi_status; + UINT32 no_reboot = 1; + efi_status = gRT->SetVariable(NO_REBOOT, &SHIM_LOCK_GUID, + EFI_VARIABLE_NON_VOLATILE + | EFI_VARIABLE_BOOTSERVICE_ACCESS + | EFI_VARIABLE_RUNTIME_ACCESS, + sizeof(UINT32), &no_reboot); + return efi_status; +} + +static int +draw_countdown(void) +{ + CHAR16 *title = L"Boot Option Restoration"; + CHAR16 *message = L"Press any key to stop system reset"; + int timeout; + + timeout = console_countdown(title, message, 5); + + return timeout; +} + +static int +get_user_choice(void) +{ + int choice; + CHAR16 *title[] = {L"Boot Option Restored", NULL}; + CHAR16 *menu_strings[] = { + L"Reset system", + L"Continue boot", + L"Always continue boot", + NULL + }; + + do { + choice = console_select(title, menu_strings, 0); + } while (choice < 0 || choice > 2); + + return choice; +} + extern EFI_STATUS efi_main(EFI_HANDLE image, EFI_SYSTEM_TABLE *systab); @@ -1037,6 +1098,26 @@ efi_main(EFI_HANDLE image, EFI_SYSTEM_TABLE *systab) VerbosePrint(L"tpm not present, starting the first image\n"); try_start_first_option(image); } else { + if (get_fallback_no_reboot() == 1) { + VerbosePrint(L"NO_REBOOT is set, starting the first image\n"); + try_start_first_option(image); + } + + int timeout = draw_countdown(); + if (timeout == 0) + goto reset; + + int choice = get_user_choice(); + if (choice == 0) { + goto reset; + } else if (choice == 2) { + efi_status = set_fallback_no_reboot(); + if (EFI_ERROR(efi_status)) + goto reset; + } + VerbosePrint(L"tpm present, starting the first image\n"); + try_start_first_option(image); +reset: VerbosePrint(L"tpm present, resetting system\n"); } |