From: chenc2 Date: Wed, 18 Oct 2017 06:23:45 +0000 (+0800) Subject: SecurityPkg/SecureBootConfigDxe: Handle lack of STR_SIGNATURE_* tokens X-Git-Tag: edk2-stable201903~3202 X-Git-Url: https://git.proxmox.com/?p=mirror_edk2.git;a=commitdiff_plain;h=3539e850ebf7f208dd6132a576afc737fbe90d5a SecurityPkg/SecureBootConfigDxe: Handle lack of STR_SIGNATURE_* tokens Add check to avoid NULL ptr dereference. The function HiiGetString will return NULL pointer when the platform does not install the appropriate string or call HiiGetString fail.(For example, HII not support specified language.) Cc: Zhang Chao Cc: Wu Hao Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: chenc2 Reviewed-by: Chao Zhang Reviewed-by: Wu Hao --- diff --git a/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigImpl.c b/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigImpl.c index acb0dc0558..d035763106 100644 --- a/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigImpl.c +++ b/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigImpl.c @@ -3572,6 +3572,9 @@ LoadSignatureList ( { EFI_STATUS Status; EFI_STRING_ID ListType; + EFI_STRING FormatNameString; + EFI_STRING FormatHelpString; + EFI_STRING FormatTypeString; EFI_SIGNATURE_LIST *ListWalker; EFI_IFR_GUID_LABEL *StartLabel; EFI_IFR_GUID_LABEL *EndLabel; @@ -3591,6 +3594,8 @@ LoadSignatureList ( CHAR16 HelpBuffer[BUFFER_MAX_SIZE]; Status = EFI_SUCCESS; + FormatNameString = NULL; + FormatHelpString = NULL; StartOpCodeHandle = NULL; EndOpCodeHandle = NULL; StartGotoHandle = NULL; @@ -3705,6 +3710,12 @@ LoadSignatureList ( goto ON_EXIT; } + FormatNameString = HiiGetString (PrivateData->HiiHandle, STRING_TOKEN (STR_SIGNATURE_LIST_NAME_FORMAT), NULL); + FormatHelpString = HiiGetString (PrivateData->HiiHandle, STRING_TOKEN (STR_SIGNATURE_LIST_HELP_FORMAT), NULL); + if (FormatNameString == NULL || FormatHelpString == NULL) { + goto ON_EXIT; + } + RemainingSize = DataSize; ListWalker = (EFI_SIGNATURE_LIST *)VariableData; while ((RemainingSize > 0) && (RemainingSize >= ListWalker->SignatureListSize)) { @@ -3725,21 +3736,23 @@ LoadSignatureList ( } else { ListType = STRING_TOKEN (STR_LIST_TYPE_UNKNOWN); } + FormatTypeString = HiiGetString (PrivateData->HiiHandle, ListType, NULL); + if (FormatTypeString == NULL) { + goto ON_EXIT; + } ZeroMem (NameBuffer, sizeof (NameBuffer)); - UnicodeSPrint (NameBuffer, - sizeof (NameBuffer), - HiiGetString (PrivateData->HiiHandle, STRING_TOKEN (STR_SIGNATURE_LIST_NAME_FORMAT), NULL), - Index + 1 - ); + UnicodeSPrint (NameBuffer, sizeof (NameBuffer), FormatNameString, Index + 1); ZeroMem (HelpBuffer, sizeof (HelpBuffer)); UnicodeSPrint (HelpBuffer, sizeof (HelpBuffer), - HiiGetString (PrivateData->HiiHandle, STRING_TOKEN (STR_SIGNATURE_LIST_HELP_FORMAT), NULL), - HiiGetString (PrivateData->HiiHandle, ListType, NULL), + FormatHelpString, + FormatTypeString, SIGNATURE_DATA_COUNTS (ListWalker) ); + SECUREBOOT_FREE_NON_NULL (FormatTypeString); + FormatTypeString = NULL; HiiCreateGotoOpCode ( StartOpCodeHandle, @@ -3777,6 +3790,8 @@ ON_EXIT: SECUREBOOT_FREE_NON_OPCODE (EndGotoHandle); SECUREBOOT_FREE_NON_NULL (VariableData); + SECUREBOOT_FREE_NON_NULL (FormatNameString); + SECUREBOOT_FREE_NON_NULL (FormatHelpString); PrivateData->ListCount = Index; @@ -3922,6 +3937,8 @@ FormatHelpInfo ( EFI_STATUS Status; EFI_TIME *Time; EFI_STRING_ID ListTypeId; + EFI_STRING FormatHelpString; + EFI_STRING FormatTypeString; UINTN DataSize; UINTN HelpInfoIndex; UINTN TotalSize; @@ -3931,12 +3948,13 @@ FormatHelpInfo ( CHAR16 *HelpInfoString; BOOLEAN IsCert; - Status = EFI_SUCCESS; - Time = NULL; - HelpInfoIndex = 0; - DataString = NULL; - HelpInfoString = NULL; - IsCert = FALSE; + Status = EFI_SUCCESS; + Time = NULL; + FormatTypeString = NULL; + HelpInfoIndex = 0; + DataString = NULL; + HelpInfoString = NULL; + IsCert = FALSE; if (CompareGuid(&ListEntry->SignatureType, &gEfiCertRsa2048Guid)) { ListTypeId = STRING_TOKEN(STR_LIST_TYPE_RSA2048_SHA256); @@ -3969,6 +3987,11 @@ FormatHelpInfo ( goto ON_EXIT; } + FormatTypeString = HiiGetString (PrivateData->HiiHandle, ListTypeId, NULL); + if (FormatTypeString == NULL) { + goto ON_EXIT; + } + TotalSize = 1024; HelpInfoString = AllocateZeroPool (TotalSize); if (HelpInfoString == NULL) { @@ -3981,40 +4004,45 @@ FormatHelpInfo ( // ZeroMem (GuidString, sizeof (GuidString)); GuidToString(&DataEntry->SignatureOwner, GuidString, BUFFER_MAX_SIZE); + FormatHelpString = HiiGetString (PrivateData->HiiHandle, STRING_TOKEN (STR_SIGNATURE_DATA_HELP_FORMAT_GUID), NULL); + if (FormatHelpString == NULL) { + goto ON_EXIT; + } HelpInfoIndex += UnicodeSPrint ( &HelpInfoString[HelpInfoIndex], TotalSize - sizeof(CHAR16) * HelpInfoIndex, - HiiGetString (PrivateData->HiiHandle, STRING_TOKEN (STR_SIGNATURE_DATA_HELP_FORMAT_GUID), NULL), + FormatHelpString, GuidString ); + SECUREBOOT_FREE_NON_NULL (FormatHelpString); + FormatHelpString = NULL; // // Format content part, it depends on the type of signature list, hash value or CN. // if (IsCert) { GetCommonNameFromX509 (ListEntry, DataEntry, &DataString); - HelpInfoIndex += UnicodeSPrint( - &HelpInfoString[HelpInfoIndex], - TotalSize - sizeof(CHAR16) * HelpInfoIndex, - HiiGetString (PrivateData->HiiHandle, STRING_TOKEN (STR_SIGNATURE_DATA_HELP_FORMAT_CN), NULL), - HiiGetString (PrivateData->HiiHandle, ListTypeId, NULL), - DataSize, - DataString - ); + FormatHelpString = HiiGetString (PrivateData->HiiHandle, STRING_TOKEN (STR_SIGNATURE_DATA_HELP_FORMAT_CN), NULL); } else { // // Format hash value for each signature data entry. // ParseHashValue (ListEntry, DataEntry, &DataString); - HelpInfoIndex += UnicodeSPrint ( - &HelpInfoString[HelpInfoIndex], - TotalSize - sizeof(CHAR16) * HelpInfoIndex, - HiiGetString (PrivateData->HiiHandle, STRING_TOKEN (STR_SIGNATURE_DATA_HELP_FORMAT_HASH), NULL), - HiiGetString (PrivateData->HiiHandle, ListTypeId, NULL), - DataSize, - DataString - ); + FormatHelpString = HiiGetString (PrivateData->HiiHandle, STRING_TOKEN (STR_SIGNATURE_DATA_HELP_FORMAT_HASH), NULL); + } + if (FormatHelpString == NULL) { + goto ON_EXIT; } + HelpInfoIndex += UnicodeSPrint ( + &HelpInfoString[HelpInfoIndex], + TotalSize - sizeof (CHAR16) * HelpInfoIndex, + FormatHelpString, + FormatTypeString, + DataSize, + DataString + ); + SECUREBOOT_FREE_NON_NULL (FormatHelpString); + FormatHelpString = NULL; // // Format revocation time part. @@ -4032,13 +4060,18 @@ FormatHelpInfo ( Time->Minute, Time->Second ); - + FormatHelpString = HiiGetString (PrivateData->HiiHandle, STRING_TOKEN (STR_SIGNATURE_DATA_HELP_FORMAT_TIME), NULL); + if (FormatHelpString == NULL) { + goto ON_EXIT; + } UnicodeSPrint ( &HelpInfoString[HelpInfoIndex], TotalSize - sizeof (CHAR16) * HelpInfoIndex, - HiiGetString (PrivateData->HiiHandle, STRING_TOKEN (STR_SIGNATURE_DATA_HELP_FORMAT_TIME), NULL), + FormatHelpString, TimeString ); + SECUREBOOT_FREE_NON_NULL (FormatHelpString); + FormatHelpString = NULL; } *StringId = HiiSetString (PrivateData->HiiHandle, 0, HelpInfoString, NULL); @@ -4046,6 +4079,8 @@ ON_EXIT: SECUREBOOT_FREE_NON_NULL (DataString); SECUREBOOT_FREE_NON_NULL (HelpInfoString); + SECUREBOOT_FREE_NON_NULL (FormatTypeString); + return Status; } @@ -4076,6 +4111,7 @@ LoadSignatureData ( EFI_IFR_GUID_LABEL *StartLabel; EFI_IFR_GUID_LABEL *EndLabel; EFI_STRING_ID HelpStringId; + EFI_STRING FormatNameString; VOID *StartOpCodeHandle; VOID *EndOpCodeHandle; UINTN DataSize; @@ -4086,6 +4122,7 @@ LoadSignatureData ( CHAR16 NameBuffer[BUFFER_MAX_SIZE]; Status = EFI_SUCCESS; + FormatNameString = NULL; StartOpCodeHandle = NULL; EndOpCodeHandle = NULL; Index = 0; @@ -4167,17 +4204,18 @@ LoadSignatureData ( ListWalker = (EFI_SIGNATURE_LIST *)((UINT8 *)ListWalker + ListWalker->SignatureListSize); } + FormatNameString = HiiGetString (PrivateData->HiiHandle, STRING_TOKEN (STR_SIGNATURE_DATA_NAME_FORMAT), NULL); + if (FormatNameString == NULL) { + goto ON_EXIT; + } + DataWalker = (EFI_SIGNATURE_DATA *)((UINT8 *)ListWalker + sizeof(EFI_SIGNATURE_LIST) + ListWalker->SignatureHeaderSize); for (Index = 0; Index < SIGNATURE_DATA_COUNTS(ListWalker); Index = Index + 1) { // // Format name buffer. // ZeroMem (NameBuffer, sizeof (NameBuffer)); - UnicodeSPrint (NameBuffer, - sizeof (NameBuffer), - HiiGetString (PrivateData->HiiHandle, STRING_TOKEN (STR_SIGNATURE_DATA_NAME_FORMAT), NULL), - Index + 1 - ); + UnicodeSPrint (NameBuffer, sizeof (NameBuffer), FormatNameString, Index + 1); // // Format help info buffer. @@ -4221,6 +4259,7 @@ ON_EXIT: SECUREBOOT_FREE_NON_OPCODE (EndOpCodeHandle); SECUREBOOT_FREE_NON_NULL (VariableData); + SECUREBOOT_FREE_NON_NULL (FormatNameString); return Status; }