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ovmf
ovmf-bsc1130267-overflow-in-partition-and-udf.p...
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File ovmf-bsc1130267-overflow-in-partition-and-udf.patch of Package ovmf
From 7e553e84a832140c54b9fe3fecff0ec857d215c3 Mon Sep 17 00:00:00 2001 From: Hao Wu <hao.a.wu@intel.com> Date: Tue, 12 Dec 2017 16:30:18 +0800 Subject: [PATCH 1/5] MdeModulePkg/UdfDxe: Refine boundary checks for file/path name string REF:https://bugzilla.tianocore.org/show_bug.cgi?id=828 The commit refines the boundary checks for file/path name string to prevent possible buffer overrun. Cc: Ruiyu Ni <ruiyu.ni@intel.com> Cc: Jiewen Yao <jiewen.yao@intel.com> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Hao Wu <hao.a.wu@intel.com> Reviewed-by: Paulo Alcantara <palcantara@suse.de> Acked-by: Star Zeng <star.zeng@intel.com> (cherry picked from commit b9ae1705adfdd43668027a25a2b03c2e81960219) --- MdeModulePkg/Universal/Disk/UdfDxe/File.c | 30 +++++++-- .../Disk/UdfDxe/FileSystemOperations.c | 65 +++++++++++++++++-- MdeModulePkg/Universal/Disk/UdfDxe/Udf.h | 30 ++++++++- 3 files changed, 110 insertions(+), 15 deletions(-) diff --git a/MdeModulePkg/Universal/Disk/UdfDxe/File.c b/MdeModulePkg/Universal/Disk/UdfDxe/File.c index 6f07bf2066dc..bd723d0257be 100644 --- a/MdeModulePkg/Universal/Disk/UdfDxe/File.c +++ b/MdeModulePkg/Universal/Disk/UdfDxe/File.c @@ -2,6 +2,7 @@ Handle operations in files and directories from UDF/ECMA-167 file systems. Copyright (C) 2014-2017 Paulo Alcantara <pcacjr@zytor.com> + Copyright (c) 2018, Intel Corporation. All rights reserved.<BR> This program and the accompanying materials are licensed and made available under the terms and conditions of the BSD License which accompanies this @@ -248,7 +249,7 @@ UdfOpen ( FileName = TempFileName + 1; } - StrCpyS (NewPrivFileData->FileName, UDF_PATH_LENGTH, FileName); + StrCpyS (NewPrivFileData->FileName, UDF_FILENAME_LENGTH, FileName); Status = GetFileSize ( PrivFsData->BlockIo, @@ -444,7 +445,7 @@ UdfRead ( FreePool ((VOID *)NewFileEntryData); NewFileEntryData = FoundFile.FileEntry; - Status = GetFileNameFromFid (NewFileIdentifierDesc, FileName); + Status = GetFileNameFromFid (NewFileIdentifierDesc, ARRAY_SIZE (FileName), FileName); if (EFI_ERROR (Status)) { FreePool ((VOID *)FoundFile.FileIdentifierDesc); goto Error_Get_FileName; @@ -456,7 +457,7 @@ UdfRead ( FoundFile.FileIdentifierDesc = NewFileIdentifierDesc; FoundFile.FileEntry = NewFileEntryData; - Status = GetFileNameFromFid (FoundFile.FileIdentifierDesc, FileName); + Status = GetFileNameFromFid (FoundFile.FileIdentifierDesc, ARRAY_SIZE (FileName), FileName); if (EFI_ERROR (Status)) { goto Error_Get_FileName; } @@ -718,6 +719,12 @@ UdfSetPosition ( /** Get information about a file. + @attention This is boundary function that may receive untrusted input. + @attention The input is from FileSystem. + + The File Set Descriptor is external input, so this routine will do basic + validation for File Set Descriptor and report status. + @param This Protocol instance pointer. @param InformationType Type of information to return in Buffer. @param BufferSize On input size of buffer, on output amount of data in @@ -794,6 +801,10 @@ UdfGetInfo ( *String = *(UINT8 *)(OstaCompressed + Index) << 8; Index++; } else { + if (Index > ARRAY_SIZE (VolumeLabel)) { + return EFI_VOLUME_CORRUPTED; + } + *String = 0; } @@ -813,7 +824,11 @@ UdfGetInfo ( String++; } - *String = L'\0'; + Index = ((UINTN)String - (UINTN)VolumeLabel) / sizeof (CHAR16); + if (Index > ARRAY_SIZE (VolumeLabel) - 1) { + Index = ARRAY_SIZE (VolumeLabel) - 1; + } + VolumeLabel[Index] = L'\0'; FileSystemInfoLength = StrSize (VolumeLabel) + sizeof (EFI_FILE_SYSTEM_INFO); @@ -823,8 +838,11 @@ UdfGetInfo ( } FileSystemInfo = (EFI_FILE_SYSTEM_INFO *)Buffer; - StrCpyS (FileSystemInfo->VolumeLabel, ARRAY_SIZE (VolumeLabel), - VolumeLabel); + StrCpyS ( + FileSystemInfo->VolumeLabel, + (*BufferSize - OFFSET_OF (EFI_FILE_SYSTEM_INFO, VolumeLabel)) / sizeof (CHAR16), + VolumeLabel + ); Status = GetVolumeSize ( PrivFsData->BlockIo, PrivFsData->DiskIo, diff --git a/MdeModulePkg/Universal/Disk/UdfDxe/FileSystemOperations.c b/MdeModulePkg/Universal/Disk/UdfDxe/FileSystemOperations.c index e048d95d3120..3f6ebddae4a8 100644 --- a/MdeModulePkg/Universal/Disk/UdfDxe/FileSystemOperations.c +++ b/MdeModulePkg/Universal/Disk/UdfDxe/FileSystemOperations.c @@ -2,6 +2,7 @@ Handle on-disk format and volume structures in UDF/ECMA-167 file systems. Copyright (C) 2014-2017 Paulo Alcantara <pcacjr@zytor.com> + Copyright (c) 2018, Intel Corporation. All rights reserved.<BR> This program and the accompanying materials are licensed and made available under the terms and conditions of the BSD License which accompanies this @@ -1412,7 +1413,7 @@ InternalFindFile ( break; } } else { - Status = GetFileNameFromFid (FileIdentifierDesc, FoundFileName); + Status = GetFileNameFromFid (FileIdentifierDesc, ARRAY_SIZE (FoundFileName), FoundFileName); if (EFI_ERROR (Status)) { break; } @@ -1703,6 +1704,11 @@ FindFile ( while (*FilePath != L'\0') { FileNamePointer = FileName; while (*FilePath != L'\0' && *FilePath != L'\\') { + if ((((UINTN)FileNamePointer - (UINTN)FileName) / sizeof (CHAR16)) >= + (ARRAY_SIZE (FileName) - 1)) { + return EFI_NOT_FOUND; + } + *FileNamePointer++ = *FilePath++; } @@ -1880,22 +1886,38 @@ ReadDirectoryEntry ( Get a filename (encoded in OSTA-compressed format) from a File Identifier Descriptor on an UDF volume. + @attention This is boundary function that may receive untrusted input. + @attention The input is from FileSystem. + + The File Identifier Descriptor is external input, so this routine will do + basic validation for File Identifier Descriptor and report status. + @param[in] FileIdentifierDesc File Identifier Descriptor pointer. + @param[in] CharMax The maximum number of FileName Unicode char, + including terminating null char. @param[out] FileName Decoded filename. @retval EFI_SUCCESS Filename decoded and read. @retval EFI_VOLUME_CORRUPTED The file system structures are corrupted. + @retval EFI_BUFFER_TOO_SMALL The string buffer FileName cannot hold the + decoded filename. **/ EFI_STATUS GetFileNameFromFid ( IN UDF_FILE_IDENTIFIER_DESCRIPTOR *FileIdentifierDesc, + IN UINTN CharMax, OUT CHAR16 *FileName ) { - UINT8 *OstaCompressed; - UINT8 CompressionId; - UINT8 Length; - UINTN Index; + UINT8 *OstaCompressed; + UINT8 CompressionId; + UINT8 Length; + UINTN Index; + CHAR16 *FileNameBak; + + if (CharMax == 0) { + return EFI_BUFFER_TOO_SMALL; + } OstaCompressed = (UINT8 *)( @@ -1908,10 +1930,22 @@ GetFileNameFromFid ( return EFI_VOLUME_CORRUPTED; } + FileNameBak = FileName; + // // Decode filename. // Length = FileIdentifierDesc->LengthOfFileIdentifier; + if (CompressionId == 16) { + if (((UINTN)Length >> 1) > CharMax) { + return EFI_BUFFER_TOO_SMALL; + } + } else { + if ((Length != 0) && ((UINTN)Length - 1 > CharMax)) { + return EFI_BUFFER_TOO_SMALL; + } + } + for (Index = 1; Index < Length; Index++) { if (CompressionId == 16) { *FileName = OstaCompressed[Index++] << 8; @@ -1926,7 +1960,11 @@ GetFileNameFromFid ( FileName++; } - *FileName = L'\0'; + Index = ((UINTN)FileName - (UINTN)FileNameBak) / sizeof (CHAR16); + if (Index > CharMax - 1) { + Index = CharMax - 1; + } + FileNameBak[Index] = L'\0'; return EFI_SUCCESS; } @@ -1934,6 +1972,12 @@ GetFileNameFromFid ( /** Resolve a symlink file on an UDF volume. + @attention This is boundary function that may receive untrusted input. + @attention The input is from FileSystem. + + The Path Component is external input, so this routine will do basic + validation for Path Component and report status. + @param[in] BlockIo BlockIo interface. @param[in] DiskIo DiskIo interface. @param[in] Volume UDF volume information structure. @@ -2052,6 +2096,9 @@ ResolveSymlink ( Index) << 8; Index++; } else { + if (Index > ARRAY_SIZE (FileName)) { + return EFI_UNSUPPORTED; + } *Char = 0; } @@ -2062,7 +2109,11 @@ ResolveSymlink ( Char++; } - *Char = L'\0'; + Index = ((UINTN)Char - (UINTN)FileName) / sizeof (CHAR16); + if (Index > ARRAY_SIZE (FileName) - 1) { + Index = ARRAY_SIZE (FileName) - 1; + } + FileName[Index] = L'\0'; break; } diff --git a/MdeModulePkg/Universal/Disk/UdfDxe/Udf.h b/MdeModulePkg/Universal/Disk/UdfDxe/Udf.h index d441539d162d..9b82441e720b 100644 --- a/MdeModulePkg/Universal/Disk/UdfDxe/Udf.h +++ b/MdeModulePkg/Universal/Disk/UdfDxe/Udf.h @@ -2,6 +2,7 @@ UDF/ECMA-167 file system driver. Copyright (C) 2014-2017 Paulo Alcantara <pcacjr@zytor.com> + Copyright (c) 2018, Intel Corporation. All rights reserved.<BR> This program and the accompanying materials are licensed and made available under the terms and conditions of the BSD License which accompanies this @@ -559,9 +560,16 @@ UdfSetPosition ( /** Get information about a file. + @attention This is boundary function that may receive untrusted input. + @attention The input is from FileSystem. + + The File Set Descriptor is external input, so this routine will do basic + validation for File Set Descriptor and report status. + @param This Protocol instance pointer. @param InformationType Type of information to return in Buffer. - @param BufferSize On input size of buffer, on output amount of data in buffer. + @param BufferSize On input size of buffer, on output amount of data in + buffer. @param Buffer The buffer to return data. @retval EFI_SUCCESS Data was returned. @@ -571,7 +579,8 @@ UdfSetPosition ( @retval EFI_VOLUME_CORRUPTED The file system structures are corrupted. @retval EFI_WRITE_PROTECTED The device is write protected. @retval EFI_ACCESS_DENIED The file was open for read only. - @retval EFI_BUFFER_TOO_SMALL Buffer was too small; required size returned in BufferSize. + @retval EFI_BUFFER_TOO_SMALL Buffer was too small; required size returned in + BufferSize. **/ EFI_STATUS @@ -769,21 +778,38 @@ ReadDirectoryEntry ( Get a filename (encoded in OSTA-compressed format) from a File Identifier Descriptor on an UDF volume. + @attention This is boundary function that may receive untrusted input. + @attention The input is from FileSystem. + + The File Identifier Descriptor is external input, so this routine will do + basic validation for File Identifier Descriptor and report status. + @param[in] FileIdentifierDesc File Identifier Descriptor pointer. + @param[in] CharMax The maximum number of FileName Unicode char, + including terminating null char. @param[out] FileName Decoded filename. @retval EFI_SUCCESS Filename decoded and read. @retval EFI_VOLUME_CORRUPTED The file system structures are corrupted. + @retval EFI_BUFFER_TOO_SMALL The string buffer FileName cannot hold the + decoded filename. **/ EFI_STATUS GetFileNameFromFid ( IN UDF_FILE_IDENTIFIER_DESCRIPTOR *FileIdentifierDesc, + IN UINTN CharMax, OUT CHAR16 *FileName ); /** Resolve a symlink file on an UDF volume. + @attention This is boundary function that may receive untrusted input. + @attention The input is from FileSystem. + + The Path Component is external input, so this routine will do basic + validation for Path Component and report status. + @param[in] BlockIo BlockIo interface. @param[in] DiskIo DiskIo interface. @param[in] Volume UDF volume information structure. -- 2.20.1 From 10ed833c05a1077fe472e790148adcea1e25a4e9 Mon Sep 17 00:00:00 2001 From: Hao Wu <hao.a.wu@intel.com> Date: Wed, 13 Dec 2017 10:23:41 +0800 Subject: [PATCH 2/5] MdeModulePkg/UdfDxe: Add boundary check the read of FE/EFE REF:https://bugzilla.tianocore.org/show_bug.cgi?id=828 Within ReadFile(): Add checks to ensure that when getting the raw data or the Allocation Descriptors' data from a FE/EFE, it will not consume data beyond the size of a FE/EFE. Cc: Ruiyu Ni <ruiyu.ni@intel.com> Cc: Jiewen Yao <jiewen.yao@intel.com> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Hao Wu <hao.a.wu@intel.com> Reviewed-by: Paulo Alcantara <palcantara@suse.de> Acked-by: Star Zeng <star.zeng@intel.com> (cherry picked from commit 5c0748f43f4e1cc15fdd0be64a764eacd7df92f6) --- .../Disk/UdfDxe/FileSystemOperations.c | 54 +++++++++++++++++-- 1 file changed, 50 insertions(+), 4 deletions(-) diff --git a/MdeModulePkg/Universal/Disk/UdfDxe/FileSystemOperations.c b/MdeModulePkg/Universal/Disk/UdfDxe/FileSystemOperations.c index 3f6ebddae4a8..bb8fd4fb68bd 100644 --- a/MdeModulePkg/Universal/Disk/UdfDxe/FileSystemOperations.c +++ b/MdeModulePkg/Universal/Disk/UdfDxe/FileSystemOperations.c @@ -504,15 +504,27 @@ DuplicateFe ( NOTE: The FE/EFE can be thought it was an inode. + @attention This is boundary function that may receive untrusted input. + @attention The input is from FileSystem. + + The (Extended) File Entry is external input, so this routine will do basic + validation for (Extended) File Entry and report status. + @param[in] FileEntryData (Extended) File Entry pointer. + @param[in] FileEntrySize Size of the (Extended) File Entry specified + by FileEntryData. @param[out] Data Buffer contains the raw data of a given (Extended) File Entry. @param[out] Length Length of the data in Buffer. + @retval EFI_SUCCESS Raw data and size of the FE/EFE was read. + @retval EFI_VOLUME_CORRUPTED The file system structures are corrupted. + **/ -VOID +EFI_STATUS GetFileEntryData ( IN VOID *FileEntryData, + IN UINTN FileEntrySize, OUT VOID **Data, OUT UINT64 *Length ) @@ -536,20 +548,40 @@ GetFileEntryData ( *Data = (VOID *)((UINT8 *)FileEntry->Data + FileEntry->LengthOfExtendedAttributes); } + + if ((*Length > FileEntrySize) || + ((UINTN)FileEntryData > (UINTN)(*Data)) || + ((UINTN)(*Data) - (UINTN)FileEntryData > FileEntrySize - *Length)) { + return EFI_VOLUME_CORRUPTED; + } + return EFI_SUCCESS; } /** Get Allocation Descriptors' data information from a given FE/EFE. + @attention This is boundary function that may receive untrusted input. + @attention The input is from FileSystem. + + The (Extended) File Entry is external input, so this routine will do basic + validation for (Extended) File Entry and report status. + @param[in] FileEntryData (Extended) File Entry pointer. + @param[in] FileEntrySize Size of the (Extended) File Entry specified + by FileEntryData. @param[out] AdsData Buffer contains the Allocation Descriptors' data from a given FE/EFE. @param[out] Length Length of the data in AdsData. + @retval EFI_SUCCESS The data and size of Allocation Descriptors + were read from the FE/EFE. + @retval EFI_VOLUME_CORRUPTED The file system structures are corrupted. + **/ -VOID +EFI_STATUS GetAdsInformation ( IN VOID *FileEntryData, + IN UINTN FileEntrySize, OUT VOID **AdsData, OUT UINT64 *Length ) @@ -573,6 +605,13 @@ GetAdsInformation ( *AdsData = (VOID *)((UINT8 *)FileEntry->Data + FileEntry->LengthOfExtendedAttributes); } + + if ((*Length > FileEntrySize) || + ((UINTN)FileEntryData > (UINTN)(*AdsData)) || + ((UINTN)(*AdsData) - (UINTN)FileEntryData > FileEntrySize - *Length)) { + return EFI_VOLUME_CORRUPTED; + } + return EFI_SUCCESS; } /** @@ -1066,7 +1105,10 @@ ReadFile ( // // There are no extents for this FE/EFE. All data is inline. // - GetFileEntryData (FileEntryData, &Data, &Length); + Status = GetFileEntryData (FileEntryData, Volume->FileEntrySize, &Data, &Length); + if (EFI_ERROR (Status)) { + return Status; + } if (ReadFileInfo->Flags == ReadFileGetFileSize) { ReadFileInfo->ReadLength = Length; @@ -1110,7 +1152,11 @@ ReadFile ( // This FE/EFE contains a run of Allocation Descriptors. Get data + size // for start reading them out. // - GetAdsInformation (FileEntryData, &Data, &Length); + Status = GetAdsInformation (FileEntryData, Volume->FileEntrySize, &Data, &Length); + if (EFI_ERROR (Status)) { + return Status; + } + AdOffset = 0; for (;;) { -- 2.20.1 From e8dcd9d262bcbb755573b44522aa558d2879f1c1 Mon Sep 17 00:00:00 2001 From: Hao Wu <hao.a.wu@intel.com> Date: Wed, 13 Dec 2017 14:39:07 +0800 Subject: [PATCH 3/5] MdeModulePkg/UdfDxe: Add boundary check for ComponentIdentifier decode REF:https://bugzilla.tianocore.org/show_bug.cgi?id=828 Within ResolveSymlink(): The boundary check will validate the 'LengthofComponentIdentifier' field of a Path Component matches the data within the relating (Extended) File Entry. Cc: Ruiyu Ni <ruiyu.ni@intel.com> Cc: Jiewen Yao <jiewen.yao@intel.com> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Hao Wu <hao.a.wu@intel.com> Reviewed-by: Paulo Alcantara <palcantara@suse.de> Acked-by: Star Zeng <star.zeng@intel.com> (cherry picked from commit 89f75aa04a97293a8ed9db2a90851a5053730cf5) --- MdeModulePkg/Universal/Disk/UdfDxe/FileSystemOperations.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/MdeModulePkg/Universal/Disk/UdfDxe/FileSystemOperations.c b/MdeModulePkg/Universal/Disk/UdfDxe/FileSystemOperations.c index bb8fd4fb68bd..ca9d828eb4c7 100644 --- a/MdeModulePkg/Universal/Disk/UdfDxe/FileSystemOperations.c +++ b/MdeModulePkg/Universal/Disk/UdfDxe/FileSystemOperations.c @@ -2135,6 +2135,10 @@ ResolveSymlink ( return EFI_VOLUME_CORRUPTED; } + if ((UINTN)PathComp->ComponentIdentifier + PathCompLength > (UINTN)EndData) { + return EFI_VOLUME_CORRUPTED; + } + Char = FileName; for (Index = 1; Index < PathCompLength; Index++) { if (CompressionId == 16) { -- 2.20.1 From c7e4427320be645324915f51e8c8e69d9cc3bb89 Mon Sep 17 00:00:00 2001 From: Hao Wu <hao.a.wu@intel.com> Date: Wed, 13 Dec 2017 16:28:33 +0800 Subject: [PATCH 4/5] MdeModulePkg/UdfDxe: Add boundary check for getting volume (free) size REF:https://bugzilla.tianocore.org/show_bug.cgi?id=828 Within GetVolumeSize(): The boundary check will validate the 'NumberOfPartitions' field of a Logical Volume Integrity Descriptor matches the data within the relating Logical Volume Descriptor. Cc: Ruiyu Ni <ruiyu.ni@intel.com> Cc: Jiewen Yao <jiewen.yao@intel.com> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Hao Wu <hao.a.wu@intel.com> Reviewed-by: Paulo Alcantara <palcantara@suse.de> Acked-by: Star Zeng <star.zeng@intel.com> (cherry picked from commit 3b30351b75d70ea65701ac999875fbb81a89a5ca) --- .../Disk/UdfDxe/FileSystemOperations.c | 17 ++++++++++++++++- MdeModulePkg/Universal/Disk/UdfDxe/Udf.h | 7 +++++++ 2 files changed, 23 insertions(+), 1 deletion(-) diff --git a/MdeModulePkg/Universal/Disk/UdfDxe/FileSystemOperations.c b/MdeModulePkg/Universal/Disk/UdfDxe/FileSystemOperations.c index ca9d828eb4c7..223608ada44a 100644 --- a/MdeModulePkg/Universal/Disk/UdfDxe/FileSystemOperations.c +++ b/MdeModulePkg/Universal/Disk/UdfDxe/FileSystemOperations.c @@ -2449,6 +2449,13 @@ SetFileInfo ( /** Get volume and free space size information of an UDF volume. + @attention This is boundary function that may receive untrusted input. + @attention The input is from FileSystem. + + The Logical Volume Descriptor and the Logical Volume Integrity Descriptor are + external inputs, so this routine will do basic validation for both descriptors + and report status. + @param[in] BlockIo BlockIo interface. @param[in] DiskIo DiskIo interface. @param[in] Volume UDF volume information structure. @@ -2487,7 +2494,8 @@ GetVolumeSize ( ExtentAd = &LogicalVolDesc->IntegritySequenceExtent; - if (ExtentAd->ExtentLength == 0) { + if ((ExtentAd->ExtentLength == 0) || + (ExtentAd->ExtentLength < sizeof (UDF_LOGICAL_VOLUME_INTEGRITY))) { return EFI_VOLUME_CORRUPTED; } @@ -2527,6 +2535,13 @@ GetVolumeSize ( goto Out_Free; } + if ((LogicalVolInt->NumberOfPartitions > MAX_UINT32 / sizeof (UINT32) / 2) || + (LogicalVolInt->NumberOfPartitions * sizeof (UINT32) * 2 > + ExtentAd->ExtentLength - sizeof (UDF_LOGICAL_VOLUME_INTEGRITY))) { + Status = EFI_VOLUME_CORRUPTED; + goto Out_Free; + } + *VolumeSize = 0; *FreeSpaceSize = 0; diff --git a/MdeModulePkg/Universal/Disk/UdfDxe/Udf.h b/MdeModulePkg/Universal/Disk/UdfDxe/Udf.h index 9b82441e720b..b054c623e5a5 100644 --- a/MdeModulePkg/Universal/Disk/UdfDxe/Udf.h +++ b/MdeModulePkg/Universal/Disk/UdfDxe/Udf.h @@ -903,6 +903,13 @@ SetFileInfo ( /** Get volume and free space size information of an UDF volume. + @attention This is boundary function that may receive untrusted input. + @attention The input is from FileSystem. + + The Logical Volume Descriptor and the Logical Volume Integrity Descriptor are + external inputs, so this routine will do basic validation for both descriptors + and report status. + @param[in] BlockIo BlockIo interface. @param[in] DiskIo DiskIo interface. @param[in] Volume UDF volume information structure. -- 2.20.1 From 65b766669d3ca2873d0c920f445d1c90e5bc7443 Mon Sep 17 00:00:00 2001 From: Hao Wu <hao.a.wu@intel.com> Date: Fri, 15 Dec 2017 11:22:16 +0800 Subject: [PATCH 5/5] MdeModulePkg/PartitionDxe: Add check for underlying device block size REF:https://bugzilla.tianocore.org/show_bug.cgi?id=828 Within FindAnchorVolumeDescriptorPointer(): Add a check for the underlying device block size to ensure it is greater than the size of an Anchor Volume Descriptor Pointer. Cc: Ruiyu Ni <ruiyu.ni@intel.com> Cc: Jiewen Yao <jiewen.yao@intel.com> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Hao Wu <hao.a.wu@intel.com> Reviewed-by: Paulo Alcantara <palcantara@suse.de> Acked-by: Star Zeng <star.zeng@intel.com> (cherry picked from commit 4df8f5bfa28b8b881e506437e8f08d92c1a00370) --- .../Universal/Disk/PartitionDxe/Udf.c | 29 +++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/MdeModulePkg/Universal/Disk/PartitionDxe/Udf.c b/MdeModulePkg/Universal/Disk/PartitionDxe/Udf.c index 7eee74895872..75aca7921be4 100644 --- a/MdeModulePkg/Universal/Disk/PartitionDxe/Udf.c +++ b/MdeModulePkg/Universal/Disk/PartitionDxe/Udf.c @@ -1,7 +1,16 @@ /** @file Scan for an UDF file system on a formatted media. + Caution: This file requires additional review when modified. + This driver will have external input - CD/DVD media. + This external input must be validated carefully to avoid security issue like + buffer overflow, integer overflow. + + FindUdfFileSystem() routine will consume the media properties and do basic + validation. + Copyright (C) 2014-2017 Paulo Alcantara <pcacjr@zytor.com> + Copyright (c) 2018, Intel Corporation. All rights reserved.<BR> This program and the accompanying materials are licensed and made available under the terms and conditions of the BSD License which accompanies this @@ -100,6 +109,20 @@ FindAnchorVolumeDescriptorPointer ( *LastRecordedBlock = EndLBA; AvdpsCount = 0; + // + // Check if the block size of the underlying media can hold the data of an + // Anchor Volume Descriptor Pointer + // + if (BlockSize < sizeof (UDF_ANCHOR_VOLUME_DESCRIPTOR_POINTER)) { + DEBUG (( + DEBUG_ERROR, + "%a: Media block size 0x%x unable to hold an AVDP.\n", + __FUNCTION__, + BlockSize + )); + return EFI_UNSUPPORTED; + } + // // Find AVDP at block 256 // @@ -597,6 +620,12 @@ Out_Free: /** Find a supported UDF file system in block device. + @attention This is boundary function that may receive untrusted input. + @attention The input is from Partition. + + The CD/DVD media is the external input, so this routine will do basic + validation for the media. + @param[in] BlockIo BlockIo interface. @param[in] DiskIo DiskIo interface. @param[out] StartingLBA UDF file system starting LBA. -- 2.20.1
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