--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/userlibandfileserver/fileserver/inc/f32image.h Thu Dec 17 09:24:54 2009 +0200
@@ -0,0 +1,1248 @@
+// Copyright (c) 1996-2009 Nokia Corporation and/or its subsidiary(-ies).
+// All rights reserved.
+// This component and the accompanying materials are made available
+// under the terms of the License "Eclipse Public License v1.0"
+// which accompanies this distribution, and is available
+// at the URL "http://www.eclipse.org/legal/epl-v10.html".
+//
+// Initial Contributors:
+// Nokia Corporation - initial contribution.
+//
+// Contributors:
+//
+// Description:
+// f32\inc\f32image.h
+//
+// WARNING: This file contains some APIs which are internal and are subject
+// to change without notice. Such APIs should therefore not be used
+// outside the Kernel and Hardware Services package.
+//
+
+/**
+ @file f32\inc\f32image.h
+ @internalTechnology
+*/
+
+#ifndef __F32IMAGE_H__
+#define __F32IMAGE_H__
+#include <e32cmn.h>
+
+/**
+Value used for E32ImageHeader::iCpuIdentifier.
+*/
+enum TCpu
+ {
+ ECpuUnknown=0, ECpuX86=0x1000, ECpuArmV4=0x2000, ECpuArmV5=0x2001, ECpuArmV6=0x2002, ECpuMCore=0x4000
+ };
+
+/**
+Ordinal value of the first entry in an executables export directory.
+@see E32ImageHeader::iExportDirOffset.
+*/
+const TInt KOrdinalBase=1;
+
+/**
+Value used to initialise E32ImageHeader::iHeaderCrc prior to CRC generation.
+*/
+const TUint32 KImageCrcInitialiser = 0xc90fdaa2u;
+
+
+/**
+Byte offset from an executable's entrypoint to the code segment ID storage location.
+*/
+const TUint KCodeSegIdOffset = 12;
+
+//
+// Flags fields for E32ImageHeader::iFlags
+//
+
+const TUint KImageDll = 0x00000001u; ///< Flag set if executable is a DLL, clear if an EXE.
+
+const TUint KImageNoCallEntryPoint = 0x00000002u; ///< Obsolete flag ignored since Symbian OS version 8.1b.
+
+const TUint KImageFixedAddressExe = 0x00000004u; ///< Executable's data should not move when running on the moving memory model.
+
+const TUint KImageABIMask = 0x00000018u; ///< Bitmask for ABI value.
+const TInt KImageABIShift = 3; ///< Bit shift count for ABI value.
+const TUint KImageABI_GCC98r2 = 0x00000000u; ///< Obsolete ABI for ARM targets.
+const TUint KImageABI_EABI = 0x00000008u; ///< ARM EABI
+
+const TUint KImageEptMask = 0x000000e0u; ///< Bitmask for Entrypoint value.
+const TInt KImageEptShift = 5; ///< Bit shift count for Entrypoint value
+const TUint KImageEpt_Eka1 = 0x00000000u; ///< @removed Obsolete format not used since Symbian OS version 8.1b.
+const TUint KImageEpt_Eka2 = 0x00000020u; ///< Standard entrypoint for ARM executable.
+
+const TUint KImageCodeUnpaged = 0x00000100u; ///< Executable image should not be demand paged. Exclusive with KImageCodePaged,
+const TUint KImageCodePaged = 0x00000200u; ///< Executable image should be demand paged. Exclusive with KImageCodeUnpaged,
+
+const TUint KImageNmdExpData = 0x00000400u; ///< Flag to indicate when named symbol export data present in image
+
+const TUint KImageDebuggable = 0x00000800u; ///< Flag to indicate image is debuggable
+
+const TUint KImageDataUnpaged = 0x00001000u; ///< Flag to indicate the image should not be data paged. Exclusive with KImageDataPaged.
+const TUint KImageDataPaged = 0x00002000u; ///< Flag to indicate the image should be data paged. Exclusive with KImageDataUnpaged.
+const TUint KImageDataPagingMask = KImageDataUnpaged | KImageDataPaged; ///< Mask for data paging flags.
+
+const TUint KImageSMPSafe = 0x00004000u; ///< Flag to indicate image is SMP safe
+
+const TUint KImageHWFloatMask = 0x00f00000u; ///< Bitmask for Floating Point type.
+const TInt KImageHWFloatShift = 20; ///< Bit shift count for Floating Point type.
+const TUint KImageHWFloat_None = EFpTypeNone << KImageHWFloatShift; ///< No hardware floating point used.
+const TUint KImageHWFloat_VFPv2 = EFpTypeVFPv2 << KImageHWFloatShift; ///< ARM VFPv2 floating point used.
+
+const TUint KImageHdrFmtMask = 0x0f000000u; ///< Bitmask for header format type.
+const TInt KImageHdrFmtShift = 24; ///< Bit shift count for header format type.
+const TUint KImageHdrFmt_Original = 0x00000000u; ///< @removed Obsolete format not used since Symbian OS version 8.1b.
+const TUint KImageHdrFmt_J = 0x01000000u; ///< @removed Obsolete format not used since Symbian OS version 8.1b.
+const TUint KImageHdrFmt_V = 0x02000000u; ///< Header has format given by class E32ImageHeaderV.
+
+const TUint KImageImpFmtMask = 0xf0000000u; ///< Bitmask for import section format type.
+const TInt KImageImpFmtShift = 28; ///< Bit shift count for import section format type.
+const TUint KImageImpFmt_PE = 0x00000000u; ///< PE-derived imports.
+const TUint KImageImpFmt_ELF = 0x10000000u; ///< ELF-derived imports.
+const TUint KImageImpFmt_PE2 = 0x20000000u; ///< PE-derived imports without redundant copy of import ordinals.
+
+
+
+
+// forward references...
+class RFile;
+class E32RelocSection;
+
+
+/**
+Structure for an executable image's header.
+This is extended by E32ImageHeaderComp and E32ImageHeaderV.
+All executables since Symbian OS version 8.1b have an header given by class E32ImageHeaderV.
+
+Summary of an executable image structure...
+
+- Header, 0..iCodeOffset-1
+- Code part, iCodeOffset..iCodeOffset+iCodeSize-1
+ - .text section, 0 + iTextSize
+ - Import Address Table (IAT), iText + ?
+ - Export Directory, iExportDirOffset + iExportDirCount*4 (in .text Section)
+- Rest of data, iCodeOffset+iCodeSize..EOF
+ - .data section, iDataOffset + iDataSize
+ - Import section, iImportOffset + sizeof(E32ImportSection)+?
+ - Code relocation section, iCodeRelocOffset + sizeof(E32RelocSection)+?
+ - Data relocation section, iDataRelocOffset + sizeof(E32RelocSection)+?
+*/
+class E32ImageHeader
+ {
+public:
+ static TInt New(E32ImageHeader*& aHdr, RFile& aFile);
+ static TInt New(E32ImageHeader*& aHdr, TUint8* aFileData, TUint32 aFileSize);
+ TInt ValidateHeader(TInt aFileSize, TUint32& aUncompressedSize) const;
+
+ inline static TUint ABIFromFlags(TUint aFlags);
+ inline static TUint EptFromFlags(TUint aFlags);
+ inline static TUint HdrFmtFromFlags(TUint aFlags);
+ inline static TUint ImpFmtFromFlags(TUint aFlags);
+
+ inline TUint ABI() const;
+ inline TUint EntryPointFormat() const;
+ inline TUint HeaderFormat() const;
+ inline TUint ImportFormat() const;
+
+ inline TUint32 CompressionType() const;
+ inline TUint32 ModuleVersion() const;
+ inline TInt TotalSize() const;
+ inline TInt UncompressedFileSize() const;
+ inline void GetSecurityInfo(SSecurityInfo& aInfo) const;
+ inline TCpu CpuIdentifier() const;
+ inline TProcessPriority ProcessPriority() const;
+ inline TUint32 ExceptionDescriptor() const;
+public:
+ TUint32 iUid1; ///< KDynamicLibraryUidValue or KExecutableImageUidValue
+ TUint32 iUid2; ///< Second UID for executable.
+ TUint32 iUid3; ///< Third UID for executable.
+ TUint32 iUidChecksum; ///< Checksum for iUid1, iUid2 and iUid3.
+ TUint iSignature; ///< Contains 'EPOC'.
+ TUint32 iHeaderCrc; ///< CRC-32 of entire header. @see #KImageCrcInitialiser.
+ TUint32 iModuleVersion; ///< Version number for this executable (used in link resolution).
+ TUint32 iCompressionType; ///< Type of compression used for file contents located after the header. (UID or 0 for none).
+ TVersion iToolsVersion; ///< Version number of tools which generated this file.
+ TUint32 iTimeLo; ///< Least significant 32 bits of the time of image creation, in milliseconds since since midnight Jan 1st, 2000.
+ TUint32 iTimeHi; ///< Most significant 32 bits of the time of image creation, in milliseconds since since midnight Jan 1st, 2000.
+ TUint iFlags; ///< Contains various bit-fields of attributes for the image.
+ TInt iCodeSize; ///< Size of executables code. Includes import address table, constant data and export directory.
+ TInt iDataSize; ///< Size of executables initialised data.
+ TInt iHeapSizeMin; ///< Minimum size for an EXEs runtime heap memory.
+ TInt iHeapSizeMax; ///< Maximum size for an EXEs runtime heap memory.
+ TInt iStackSize; ///< Size for stack required by an EXEs initial thread.
+ TInt iBssSize; ///< Size of executables uninitialised data.
+ TUint iEntryPoint; ///< Offset into code of the entry point.
+ TUint iCodeBase; ///< Virtual address that the executables code is linked for.
+ TUint iDataBase; ///< Virtual address that the executables data is linked for.
+ TInt iDllRefTableCount; ///< Number of executable against which this executable is linked. The number of files mention in the import section at iImportOffset.
+ TUint iExportDirOffset; ///< Byte offset into file of the export directory.
+ TInt iExportDirCount; ///< Number of entries in the export directory.
+ TInt iTextSize; ///< Size of just the text section, also doubles as the offset for the Import Address Table w.r.t. the code section.
+ TUint iCodeOffset; ///< Offset into file of the code section. Also doubles the as header size.
+ TUint iDataOffset; ///< Offset into file of the data section.
+ TUint iImportOffset; ///< Offset into file of the import section (E32ImportSection).
+ TUint iCodeRelocOffset; ///< Offset into file of the code relocation section (E32RelocSection).
+ TUint iDataRelocOffset; ///< Offset into file of the data relocation section (E32RelocSection).
+ TUint16 iProcessPriority; ///< Initial runtime process priorty for an EXE. (Value from enum TProcessPriority.)
+ TUint16 iCpuIdentifier; ///< Value from enum TCpu which indicates the CPU architecture for which the image was created
+ };
+
+
+/**
+Extends E32ImageHeader.
+*/
+class E32ImageHeaderComp : public E32ImageHeader
+ {
+public:
+ TUint32 iUncompressedSize; ///< Uncompressed size of file data after the header, or zero if file not compressed.
+ };
+
+
+/**
+Extends E32ImageHeaderComp.
+All Symbian OS executable files have a header in this format since OS version 8.1b.
+*/
+class E32ImageHeaderV : public E32ImageHeaderComp
+ {
+public:
+ SSecurityInfo iS; ///< Platform Security information of executable.
+ TUint32 iExceptionDescriptor; ///< Offset in bytes from start of code section to Exception Descriptor, bit 0 set if valid.
+ TUint32 iSpare2; ///< Reserved for future use. Set to zero.
+ TUint16 iExportDescSize; ///< Size of export description stored in iExportDesc.
+ TUint8 iExportDescType; ///< Type of description of holes in export table
+ TUint8 iExportDesc[1]; ///< Description of holes in export table, size given by iExportDescSize..
+public:
+ TInt ValidateWholeImage(TAny* aBufferStart, TUint aBufferSize) const;
+ TInt ValidateHeader(TInt aFileSize, TUint32& aUncompressedSize) const;
+ TInt ValidateExportDescription() const;
+ TInt ValidateRelocations(TAny* aBufferStart, TUint aBufferSize, TUint aRelocationInfoOffset, TUint aRelocatedSectionSize, E32RelocSection*& aRelocationSection) const;
+ TInt ValidateImports(TAny* aBufferStart, TUint aBufferSize, TUint& aBiggestImportCount) const;
+ TInt ValidateAndAdjust(TUint32 aFileSize);
+ };
+
+// export description type E32ImageHeaderV::iExportDescType
+const TUint KImageHdr_ExpD_NoHoles =0x00; ///< No holes, all exports present.
+const TUint KImageHdr_ExpD_FullBitmap =0x01; ///< Full bitmap present at E32ImageHeaderV::iExportDesc
+const TUint KImageHdr_ExpD_SparseBitmap8 =0x02; ///< Sparse bitmap present at E32ImageHeaderV::iExportDesc, granularity 8
+const TUint KImageHdr_ExpD_Xip =0xff; ///< XIP file
+
+
+//
+// inline getters for E32ImageHeader
+//
+
+/**
+Extract ABI type from aFlags.
+*/
+inline TUint E32ImageHeader::ABIFromFlags(TUint aFlags)
+ {
+ return aFlags & KImageABIMask;
+ }
+
+/**
+Extract ABI type from #iFlags.
+*/
+inline TUint E32ImageHeader::ABI() const
+ {
+ return ABIFromFlags(iFlags);
+ }
+
+/**
+Extract entrypoint format from aFlags.
+*/
+inline TUint E32ImageHeader::EptFromFlags(TUint aFlags)
+ {
+ return aFlags & KImageEptMask;
+ }
+
+/**
+Extract entrypoint format from #iFlags.
+*/
+inline TUint E32ImageHeader::EntryPointFormat() const
+ {
+ return EptFromFlags(iFlags);
+ }
+
+/**
+Extract header format from aFlags.
+*/
+inline TUint E32ImageHeader::HdrFmtFromFlags(TUint aFlags)
+ {
+ return aFlags & KImageHdrFmtMask;
+ }
+
+/**
+Extract header format from #iFlags.
+*/
+inline TUint E32ImageHeader::HeaderFormat() const
+ {
+ return HdrFmtFromFlags(iFlags);
+ }
+
+/**
+Extract import format from aFlags.
+*/
+inline TUint E32ImageHeader::ImpFmtFromFlags(TUint aFlags)
+ {
+ return aFlags & KImageImpFmtMask;
+ }
+
+/**
+Extract import format from #iFlags.
+*/
+inline TUint E32ImageHeader::ImportFormat() const
+ {
+ return ImpFmtFromFlags(iFlags);
+ }
+
+/**
+Return #iCompressionType.
+*/
+inline TUint32 E32ImageHeader::CompressionType() const
+ {
+ return iCompressionType;
+ }
+
+/**
+Return #iModuleVersion.
+*/
+inline TUint32 E32ImageHeader::ModuleVersion() const
+ {
+ return iModuleVersion;
+ }
+
+/**
+Return size of this header.
+*/
+inline TInt E32ImageHeader::TotalSize() const
+ {
+ return iCodeOffset;
+ }
+
+/**
+Return total size of file after decompression, or -1 if file not compressed.
+*/
+inline TInt E32ImageHeader::UncompressedFileSize() const
+ {
+ if(iCompressionType==0)
+ return -1; // not compressed
+ else
+ return ((E32ImageHeaderComp*)this)->iUncompressedSize + TotalSize();
+ }
+
+/**
+Return copy of security info, #E32ImageHeaderV::iS.
+*/
+inline void E32ImageHeader::GetSecurityInfo(SSecurityInfo& aInfo) const
+ {
+ aInfo = ((E32ImageHeaderV*)this)->iS;
+ }
+
+/**
+Return #iCpuIdentifier.
+*/
+inline TCpu E32ImageHeader::CpuIdentifier() const
+ {
+ return (TCpu)iCpuIdentifier;
+ }
+
+/**
+Return #iProcessPriority.
+*/
+inline TProcessPriority E32ImageHeader::ProcessPriority() const
+ {
+ return (TProcessPriority)iProcessPriority;
+ }
+
+/**
+Return fffset in bytes from start of code section for the Exception Descriptor.
+Or zero if not present.
+*/
+inline TUint32 E32ImageHeader::ExceptionDescriptor() const
+ {
+ TUint32 xd = ((E32ImageHeaderV*)this)->iExceptionDescriptor;
+
+ if((xd & 1) && (xd != 0xffffffffu))
+ return (xd & ~1);
+
+ return 0;
+ }
+
+
+/**
+A block of imports from a single executable.
+These structures are conatined in a images Import Section (E32ImportSection).
+*/
+class E32ImportBlock
+ {
+public:
+ inline const E32ImportBlock* NextBlock(TUint aImpFmt) const;
+ inline TInt Size(TUint aImpFmt) const;
+ inline const TUint* Imports() const; // import list if present
+public:
+ TUint32 iOffsetOfDllName; ///< Offset from start of import section for a NUL terminated executable (DLL or EXE) name.
+ TInt iNumberOfImports; ///< Number of imports from this executable.
+// TUint iImport[iNumberOfImports]; ///< For ELF-derived executes: list of code section offsets. For PE, list of imported ordinals. Omitted in PE2 import format
+ };
+
+/**
+Return size of this import block.
+@param aImpFmt Import format as obtained from image header.
+*/
+inline TInt E32ImportBlock::Size(TUint aImpFmt) const
+ {
+ TInt r = sizeof(E32ImportBlock);
+ if(aImpFmt!=KImageImpFmt_PE2)
+ r += iNumberOfImports * sizeof(TUint);
+ return r;
+ }
+
+/**
+Return pointer to import block which immediately follows this one.
+@param aImpFmt Import format as obtained from image header.
+*/
+inline const E32ImportBlock* E32ImportBlock::NextBlock(TUint aImpFmt) const
+ {
+ const E32ImportBlock* next = this + 1;
+ if(aImpFmt!=KImageImpFmt_PE2)
+ next = (const E32ImportBlock*)( (TUint8*)next + iNumberOfImports * sizeof(TUint) );
+ return next;
+ }
+
+/**
+Return address of first import in this block.
+For import format KImageImpFmt_ELF, imports are list of code section offsets.
+For import format KImageImpFmt_PE, imports are a list of imported ordinals.
+For import format KImageImpFmt_PE2, the import list is not present and should not be accessed.
+*/
+inline const TUint* E32ImportBlock::Imports() const
+ {
+ return (const TUint*)(this + 1);
+ }
+
+
+/**
+Header for the Import Section in an image, as referenced by E32ImageHeader::iImportOffset.
+Immediately following this structure are an array of E32ImportBlock structures.
+The number of these is given by E32ImageHeader::iDllRefTableCount.
+*/
+class E32ImportSection
+ {
+public:
+ TInt iSize; ///< Size of this section excluding 'this' structure
+// E32ImportBlock iImportBlock[iDllRefTableCount];
+ };
+
+
+/**
+A block of relocations for a single page (4kB) of code/data.
+
+Immediately following this structure are an array of TUint16 values
+each representing a single value in the page which is to be relocated.
+The lower 12 bits of each entry is the offset, in bytes, from start of this page.
+The Upper 4 bits are the relocation type to be applied to the 32-bit value located
+at that offset.
+ - 1 means relocate relative to code section.
+ - 2 means relocate relative to data section.
+ - 3 means relocate relative to code or data section; calculate which.
+
+A value of all zeros (0x0000) is ignored. (Used for padding structure to 4 byte alignment).
+*/
+class E32RelocBlock
+ {
+public:
+ TUint32 iPageOffset; ///< Offset, in bytes, for the page being relocated; relative to the section start. Always a multiple of the page size: 4096 bytes.
+ TUint32 iBlockSize; ///< Size, in bytes, for this block structure. Always a multiple of 4.
+// TUint16 iEntry[]
+ };
+
+
+/**
+Header for a Relocation Section in an image, as referenced by E32ImageHeader::iCodeRelocOffset
+or E32ImageHeader::iDataRelocOffset.
+
+Immediately following this structure are an array of E32RelocBlock structures.
+*/
+class E32RelocSection
+ {
+public:
+ TInt iSize; ///< Size of this relocation section including 'this' structure. Always a multiple of 4.
+ TInt iNumberOfRelocs; ///< Number of relocations in this section.
+// E32RelocBlock iRelockBlock[];
+ };
+
+
+/**
+Structure contained in the export directory in text section of the stdexe/stddll.
+It contains information on the names of symbols exported by this stdexe/stddll and
+pointers to a E32EpocExpSymInfoHdr structure of any stddlls that are dependencies of
+this stdexe/stddll.
+
+This is not used for emulator images see E32EmulExpSymInfoHdr below.
+@see E32EmulExpSymInfoHdr
+*/
+class E32EpocExpSymInfoHdr
+ {
+public:
+ TInt iSize; // size of this Table
+ TInt16 iFlags;
+ TInt16 iSymCount; // number of symbols
+ TInt iSymbolTblOffset; // start of the symbol table - offset from byte 0 of this header
+ TInt iStringTableSz; // size of the string table
+ TInt iStringTableOffset; // start of the string table having names of the symbols - offset from byte 0 of this header
+ TInt iDllCount; // Number of dependent DLLs
+ TInt iDepDllZeroOrdTableOffset; // offset of the DLL dependency table - offset from byte 0 of this header.
+ };
+
+
+/**
+Header of the structure contained in the 'KWin32SectionName_NmdExpData'
+segment of emulator stdexe & stddll images.
+The segment contains addresses of symbols and NULL
+terminated ASCII strings of the names of static dependencies.
+For a stdexe, this segment contains the following:
+ a) symbol count (iSymCount) and static dependency count (iDllCount)
+ b) iSymCount * symbol addresses
+ c) iSymCount * symbol names
+ d) iDllCount * dependency names
+
+For a stddll, this segment contains the following:
+ a) symbol count (iSymCout) is always 0
+ b) static dependency count (iDllCount)
+ c) iDllCount * dependency names
+The symbol addresses and names are not required for a stddll as the Windows API,
+GetProcAddress may be used to get the addresses for symbol names.
+Since this API works only on DLL handles, we explicitly list them for stdexes.
+This is used for emulator images only.
+*/
+class E32EmulExpSymInfoHdr
+ {
+public:
+ TInt32 iSymCount; // Number of symbols
+ TInt32 iDllCount; // Number of static dependency DLLs
+ };
+
+
+
+#ifdef INCLUDE_E32IMAGEHEADER_IMPLEMENTATION
+
+// include code which implements validation functions...
+
+#ifndef RETURN_FAILURE
+#define RETURN_FAILURE(_r) return (_r)
+#endif
+
+#ifndef E32IMAGEHEADER_TRACE
+#define E32IMAGEHEADER_TRACE(_t) ((void)0)
+#endif
+
+
+#include <e32uid.h>
+
+
+/**
+Validate this image header.
+
+After successful validation the following are true:
+ - File size is big enough to contain the entire header.
+ - Values #iUidChecksum, #iSignature and #iHeaderCrc are correct.
+ - CPU type (#iCpuIdentifier), ABI type (#iFlags&#KImageABIMask) and
+ entrypoint type (#iFlags&#KImageEptMask) are valid for this system.
+ - Code part of file as specified by #iCodeOffset and #iCodeSize is fully within the file.
+ - Text section size (#iTextSize) is within code part.
+ - Entrypoint value (#iEntryPoint) lies within the code part and is aligned correctly.
+ - Export directory as specified by #iExportDirCount and #iExportDirOffset is fully
+ within code part and is aligned correctly.
+ - Exception description (E32ImageHeaderV::iExceptionDescriptor), if present,
+ lies within the code part.
+ - Data part of file as specified by #iDataOffset and #iDataSize is fully within the file.
+ Or data is not present (#iDataOffset==#iDataSize==0).
+ - Import section (class E32ImportSection at #iImportOffset) is within 'rest of data'
+ and aligned correctly. Data following the E32ImportSection header is NOT validated or
+ checked if it is fully contained within the file.
+ - Code relocations (class E32RelocSection at #iCodeRelocOffset) is within 'rest of data'
+ and aligned correctly. Data following the E32RelocSection header is NOT validated or
+ checked if it is fully contained within the file.
+ - Data relocations (class E32RelocSection at #iDataRelocOffset) is within 'rest of data'
+ and aligned correctly. Data following the E32RelocSection header is NOT validated or
+ checked if it is fully contained within the file.
+ - Export description is validated by E32ImageHeaderV::ValidateExportDescription().
+ - #iUid1 is consistant with #iFlags&#KImageDll. I.e. if flaged as a DLL, #iUid1 is
+ KDynamicLibraryUidValue, otherwise it is KExecutableImageUidValue.
+ - Version number (#iModuleVersion) is valid. (Major and minor versions are <32768).
+ - File compression type (#iCompressionType) is supported.
+ - #iHeapSizeMax>=#iHeapSizeMin
+ - All signed values in header are not negative.
+
+@param aFileSize Total size of the file from which this header was created.
+@param[out] aUncompressedSize Returns the total size that the file data would be once decompressed.
+
+@return KErrNone if no errors detected;
+ KErrCorrupt if errors found;
+ KErrNotSupported if image format not supported on this platform.
+*/
+TInt E32ImageHeader::ValidateHeader(TInt aFileSize, TUint32& aUncompressedSize) const
+ {
+ // check file is big enough for any header...
+ if(TUint(aFileSize)<sizeof(*this))
+ return KErrCorrupt;
+
+ TUint hdrfmt = HeaderFormat();
+ if(hdrfmt==KImageHdrFmt_V)
+ return ((E32ImageHeaderV*)this)->ValidateHeader(aFileSize,aUncompressedSize);
+
+ return KErrNotSupported; // header format unrecognised
+ }
+
+/**
+Validate this image header.
+
+@param aFileSize Total size of the file from which this header was created.
+@param[out] aUncompressedSize Returns the total size that the file data would be once decompressed.
+
+@return KErrNone if no errors detected;
+ KErrCorrupt if errors found;
+ KErrNotSupported if image format not supported on this platform.
+*/
+TInt E32ImageHeaderV::ValidateHeader(TInt aFileSize, TUint32& aUncompressedSize) const
+ {
+ const TUint KMaxDesSize = 0x0fffffffu; // maximum size of descriptor
+ if(aFileSize==-1)
+ {
+ // file size unknown, set to maximum valid so rest of validation works...
+ aFileSize = KMaxDesSize;
+ }
+ if(TUint(aFileSize)>KMaxDesSize)
+ RETURN_FAILURE(KErrCorrupt); // file size negative or too big
+
+ aUncompressedSize = 0;
+
+ // check file is big enough to contain this header...
+ if(aFileSize<(TInt)sizeof(*this))
+ RETURN_FAILURE(KErrCorrupt);
+
+ // check header format version...
+ if((iFlags&KImageHdrFmtMask)!=KImageHdrFmt_V)
+ RETURN_FAILURE(KErrNotSupported);
+
+ // check header size...
+ TUint headerSize = iCodeOffset;
+ if(headerSize>TUint(aFileSize))
+ RETURN_FAILURE(KErrCorrupt); // Fuzzer can't trigger this because Loader will fail earlier when reading header from file
+
+ // check iCpuIdentifier...
+ TCpu cpu = (TCpu)iCpuIdentifier;
+ TBool isARM = (cpu==ECpuArmV4 || cpu==ECpuArmV5 || cpu==ECpuArmV6);
+#if defined(__CPU_ARM)
+ if(!isARM)
+ RETURN_FAILURE(KErrNotSupported);
+#elif defined(__CPU_X86)
+ if(cpu!=ECpuX86)
+ RETURN_FAILURE(KErrNotSupported);
+#endif
+ TUint32 pointerAlignMask = isARM ? 3 : 0; // mask of bits which must be zero for aligned pointers/offsets
+
+ // check iUid1,iUid2,iUid3,iUidChecksum...
+ TUidType uids = *(const TUidType*)&iUid1;
+ TCheckedUid chkuid(uids);
+ const TUint32* pChkUid = (const TUint32*)&chkuid; // need hackery to verify the UID checksum since everything is private
+ if(pChkUid[3]!=iUidChecksum)
+ RETURN_FAILURE(KErrCorrupt);
+
+ // check iSignature...
+ if(iSignature!=0x434f5045) // 'EPOC'
+ RETURN_FAILURE(KErrCorrupt);
+
+ // check iHeaderCrc...
+ TUint32 supplied_crc = iHeaderCrc;
+ ((E32ImageHeaderV*)this)->iHeaderCrc = KImageCrcInitialiser;
+ TUint32 crc = 0;
+ Mem::Crc32(crc, this, headerSize);
+ ((E32ImageHeaderV*)this)->iHeaderCrc = supplied_crc;
+ if(crc!=supplied_crc)
+ RETURN_FAILURE(KErrCorrupt);
+
+ // check iModuleVersion...
+ TUint32 mv = iModuleVersion;
+ if(mv>=0x80000000u || (mv&0x0000ffffu)>0x8000u)
+ RETURN_FAILURE(KErrNotSupported);
+
+ // check iCompressionType and get uncompressed size...
+ TUint compression = iCompressionType;
+ TUint uncompressedSize = aFileSize;
+ if(compression!=KFormatNotCompressed)
+ {
+ if(compression!=KUidCompressionDeflate && compression!=KUidCompressionBytePair)
+ RETURN_FAILURE(KErrNotSupported); // unknown compression method
+ uncompressedSize = headerSize+iUncompressedSize;
+ if(uncompressedSize<headerSize)
+ RETURN_FAILURE(KErrCorrupt); // size overflowed 32 bits
+ }
+
+ // check sizes won't overflow the limit for a descriptor (many Loader uses won't like that).
+ if(uncompressedSize>KMaxDesSize)
+ RETURN_FAILURE(KErrCorrupt);
+
+ // check KImageDll in iFlags...
+ if(iFlags&KImageDll)
+ {
+ if(iUid1!=TUint32(KDynamicLibraryUidValue))
+ RETURN_FAILURE(KErrNotSupported);
+ }
+ else if(iUid1!=TUint32(KExecutableImageUidValue))
+ RETURN_FAILURE(KErrNotSupported);
+
+ // check iFlags for ABI and entry point types...
+ if(isARM)
+ {
+ if((iFlags&KImageEptMask)!=KImageEpt_Eka2)
+ RETURN_FAILURE(KErrNotSupported);
+ #if defined(__EABI__)
+ if((iFlags&KImageABIMask)!=KImageABI_EABI)
+ RETURN_FAILURE(KErrNotSupported);
+ #elif defined(__GCC32__)
+ if((iFlags&KImageABIMask)!=KImageABI_GCC98r2)
+ RETURN_FAILURE(KErrNotSupported);
+ #endif
+ }
+ else
+ {
+ if(iFlags&KImageEptMask)
+ RETURN_FAILURE(KErrNotSupported); // no special entry point type allowed on non-ARM targets
+ if(iFlags&KImageABIMask)
+ RETURN_FAILURE(KErrNotSupported);
+ }
+
+ // check iFlags for import format...
+ if((iFlags&KImageImpFmtMask)>KImageImpFmt_PE2)
+ RETURN_FAILURE(KErrNotSupported);
+
+ // check iHeapSizeMin...
+ if(iHeapSizeMin<0)
+ RETURN_FAILURE(KErrCorrupt);
+
+ // check iHeapSizeMax...
+ if(iHeapSizeMax<iHeapSizeMin)
+ RETURN_FAILURE(KErrCorrupt);
+
+ // check iStackSize...
+ if(iStackSize<0)
+ RETURN_FAILURE(KErrCorrupt);
+
+ // check iBssSize...
+ if(iBssSize<0)
+ RETURN_FAILURE(KErrCorrupt);
+
+ // check iEntryPoint...
+ if(iEntryPoint>=TUint(iCodeSize))
+ RETURN_FAILURE(KErrCorrupt);
+ if(iEntryPoint+KCodeSegIdOffset+sizeof(TUint32)>TUint(iCodeSize))
+ RETURN_FAILURE(KErrCorrupt);
+ if(iEntryPoint&pointerAlignMask)
+ RETURN_FAILURE(KErrCorrupt); // not aligned
+
+ // check iCodeBase...
+ if(iCodeBase&3)
+ RETURN_FAILURE(KErrCorrupt); // not aligned
+
+ // check iDataBase...
+ if(iDataBase&3)
+ RETURN_FAILURE(KErrCorrupt); // not aligned
+
+ // check iDllRefTableCount...
+ if(iDllRefTableCount<0)
+ RETURN_FAILURE(KErrCorrupt);
+ if(iDllRefTableCount)
+ {
+ if(!iImportOffset)
+ RETURN_FAILURE(KErrCorrupt); // we link to DLLs but have no import data
+ }
+
+ // check iCodeOffset and iCodeSize specify region in file...
+ TUint codeStart = iCodeOffset;
+ TUint codeEnd = codeStart+iCodeSize;
+ if(codeEnd<codeStart)
+ RETURN_FAILURE(KErrCorrupt);
+// if(codeStart<headerSize)
+// RETURN_FAILURE(KErrCorrupt); // can't happen because headerSize is defined as iCodeOffset (codeStart)
+ if(codeEnd>uncompressedSize)
+ RETURN_FAILURE(KErrCorrupt);
+
+ // check iDataOffset and iDataSize specify region in file...
+ TUint dataStart = iDataOffset;
+ TUint dataEnd = dataStart+iDataSize;
+ if(dataEnd<dataStart)
+ RETURN_FAILURE(KErrCorrupt);
+ if(!dataStart)
+ {
+ // no data...
+ if(dataEnd)
+ RETURN_FAILURE(KErrCorrupt);
+ }
+ else
+ {
+ if(dataStart<codeEnd)
+ RETURN_FAILURE(KErrCorrupt);
+ if(dataEnd>uncompressedSize)
+ RETURN_FAILURE(KErrCorrupt);
+ if((dataStart-codeStart)&pointerAlignMask)
+ RETURN_FAILURE(KErrCorrupt); // data not aligned with respect to code
+ }
+
+
+ // check total data size isn't too bit...
+ TUint totalDataSize = iDataSize+iBssSize;
+ if(totalDataSize>0x7fff0000)
+ RETURN_FAILURE(KErrNoMemory);
+
+ // check iExportDirOffset and iExportDirCount specify region in code part...
+ if(TUint(iExportDirCount)>65535)
+ RETURN_FAILURE(KErrCorrupt); // too many exports
+ if(iExportDirCount)
+ {
+ TUint exportsStart = iExportDirOffset;
+ TUint exportsEnd = exportsStart+iExportDirCount*sizeof(TUint32);
+ if(iFlags&KImageNmdExpData)
+ exportsStart -= sizeof(TUint32); // allow for 0th ordinal
+ if(exportsEnd<exportsStart)
+ RETURN_FAILURE(KErrCorrupt);
+ if(exportsStart<codeStart)
+ RETURN_FAILURE(KErrCorrupt);
+ if(exportsEnd>codeEnd)
+ RETURN_FAILURE(KErrCorrupt);
+ if((exportsStart-codeStart)&pointerAlignMask)
+ RETURN_FAILURE(KErrCorrupt); // not aligned within code section
+ }
+
+ // check iTextSize...
+ if(TUint(iTextSize)>TUint(iCodeSize))
+ RETURN_FAILURE(KErrCorrupt);
+
+ // check iImportOffset...
+ TUint start = iImportOffset;
+ if(start)
+ {
+ TUint end = start+sizeof(E32ImportSection); // minimum valid size
+ if(end<start)
+ RETURN_FAILURE(KErrCorrupt);
+ if(start<codeEnd)
+ RETURN_FAILURE(KErrCorrupt);
+ if(end>uncompressedSize)
+ RETURN_FAILURE(KErrCorrupt);
+ if((start-codeEnd)&pointerAlignMask)
+ RETURN_FAILURE(KErrCorrupt); // not aligned within 'rest of data'
+ }
+
+ // check iCodeRelocOffset...
+ start = iCodeRelocOffset;
+ if(start)
+ {
+ TUint end = start+sizeof(E32RelocSection); // minimum valid size
+ if(end<start)
+ RETURN_FAILURE(KErrCorrupt);
+ if(start<codeEnd)
+ RETURN_FAILURE(KErrCorrupt);
+ if(end>uncompressedSize)
+ RETURN_FAILURE(KErrCorrupt);
+ if((start-codeEnd)&pointerAlignMask)
+ RETURN_FAILURE(KErrCorrupt); // not aligned within 'rest of data'
+ }
+
+ // check iDataRelocOffset...
+ start = iDataRelocOffset;
+ if(start)
+ {
+ TUint end = start+sizeof(E32RelocSection); // minimum valid size
+ if(end<start)
+ RETURN_FAILURE(KErrCorrupt);
+ if(start<codeEnd)
+ RETURN_FAILURE(KErrCorrupt);
+ if(end>uncompressedSize)
+ RETURN_FAILURE(KErrCorrupt);
+ if((start-codeEnd)&pointerAlignMask)
+ RETURN_FAILURE(KErrCorrupt); // not aligned within 'rest of data'
+ }
+
+ // check exception descriptor...
+ if(iExceptionDescriptor&1) // if valid...
+ if(iExceptionDescriptor>=TUint(iCodeSize))
+ RETURN_FAILURE(KErrCorrupt);
+
+ TInt r = ValidateExportDescription();
+ if(r!=KErrNone)
+ RETURN_FAILURE(r);
+
+ // done...
+ aUncompressedSize = uncompressedSize;
+ return KErrNone;
+ }
+
+
+/**
+Valdate that the export description is valid.
+*/
+TInt E32ImageHeaderV::ValidateExportDescription() const
+ {
+ TUint headerSize = iCodeOffset;
+
+ // check export description...
+ TUint edSize = iExportDescSize + sizeof(iExportDescSize) + sizeof(iExportDescType);
+ edSize = (edSize+3)&~3;
+ TUint edEnd = _FOFF(E32ImageHeaderV,iExportDescSize)+edSize;
+ if(edEnd!=headerSize)
+ RETURN_FAILURE(KErrCorrupt);
+
+ // size of bitmap of exports...
+ TUint bitmapSize = (iExportDirCount+7) >> 3;
+
+ // check export description bitmap...
+ switch(iExportDescType)
+ {
+ case KImageHdr_ExpD_NoHoles:
+ // no bitmap to check...
+ E32IMAGEHEADER_TRACE(("ValidateExportDescription NoHoles"));
+ return KErrNone;
+
+ case KImageHdr_ExpD_FullBitmap:
+ // full bitmap present...
+ E32IMAGEHEADER_TRACE(("ValidateExportDescription FullBitmap"));
+ if(bitmapSize!=iExportDescSize)
+ RETURN_FAILURE(KErrCorrupt);
+ return KErrNone;
+
+ case KImageHdr_ExpD_SparseBitmap8:
+ {
+ // sparse bitmap present...
+ E32IMAGEHEADER_TRACE(("ValidateExportDescription SparseBitmap8"));
+
+ // get size of meta-bitmap...
+ TUint metaBitmapSize = (bitmapSize+7) >> 3;
+ if(metaBitmapSize>iExportDescSize)
+ RETURN_FAILURE(KErrCorrupt); // doesn't fit
+
+ TUint totalSize = metaBitmapSize;
+
+ // scan meta-bitmap counting extra bytes which should be present...
+ const TUint8* metaBitmap = iExportDesc;
+ const TUint8* metaBitmapEnd = metaBitmap + metaBitmapSize;
+ while(metaBitmap<metaBitmapEnd)
+ {
+ TUint bits = *metaBitmap++;
+ do
+ {
+ if(bits&1)
+ ++totalSize; // another byte is present in bitmap
+ }
+ while(bits>>=1);
+ }
+
+ if(totalSize!=iExportDescSize)
+ RETURN_FAILURE(KErrCorrupt);
+ }
+ return KErrNone;
+
+ default:
+ E32IMAGEHEADER_TRACE(("ValidateExportDescription ?"));
+ RETURN_FAILURE(KErrNotSupported);
+ }
+ }
+
+
+/**
+Validate a relocation section.
+
+@param aBufferStart Start of buffer containing the data after the code part in the image file.
+@param aBufferSize Size of data at aBufferStart.
+@param aRelocationInfoOffset File offset for relocation section. (#iCodeRelocOffset or #iDataRelocOffset.)
+@param aRelocatedSectionSize Size of section being relocated. (#iCodeSize or #iDataSize.)
+@param[out] aRelocationSection Set to the start of the relocation section in the given buffer.
+
+@return KErrNone if relocation section is valid, else KErrCorrupt.
+*/
+TInt E32ImageHeaderV::ValidateRelocations(TAny* aBufferStart, TUint aBufferSize, TUint aRelocationInfoOffset, TUint aRelocatedSectionSize, E32RelocSection*& aRelocationSection) const
+ {
+ aRelocationSection = 0;
+ if(!aRelocationInfoOffset)
+ return KErrNone; // no relocations
+
+ // get alignment requirements...
+ TCpu cpu = (TCpu)iCpuIdentifier;
+ TBool isARM = (cpu==ECpuArmV4 || cpu==ECpuArmV5 || cpu==ECpuArmV6);
+ TUint32 pointerAlignMask = isARM ? 3 : 0; // mask of bits which must be zero for aligned pointers/offsets
+
+ // buffer pointer to read relocation from...
+ TUint8* bufferStart = (TUint8*)aBufferStart;
+ TUint8* bufferEnd = bufferStart+aBufferSize;
+ TUint baseOffset = iCodeOffset+iCodeSize; // file offset for aBufferStart
+ TUint8* sectionStart = (bufferStart+aRelocationInfoOffset-baseOffset);
+ TUint8* p = sectionStart;
+
+ // read section header (ValidateHeader has alread checked this is OK)...
+ E32RelocSection* sectionHeader = (E32RelocSection*)p;
+ TUint size = sectionHeader->iSize;
+ TUint relocsRemaining = sectionHeader->iNumberOfRelocs;
+ E32IMAGEHEADER_TRACE(("E32RelocSection 0x%x %d",size,relocsRemaining));
+ if(size&3)
+ RETURN_FAILURE(KErrCorrupt); // not multiple of word size
+
+ // calculate buffer range for block data...
+ p = (TUint8*)(sectionHeader+1); // start of first block
+ TUint8* sectionEnd = p+size;
+ if(sectionEnd<p)
+ RETURN_FAILURE(KErrCorrupt); // math overflow
+ if(sectionEnd>bufferEnd)
+ RETURN_FAILURE(KErrCorrupt); // overflows buffer
+
+ // process each block...
+ while(p!=sectionEnd)
+ {
+ E32RelocBlock* block = (E32RelocBlock*)p;
+
+ // get address of first entry in this block...
+ TUint16* entryPtr = (TUint16*)(block+1);
+ if((TUint8*)entryPtr<(TUint8*)block || (TUint8*)entryPtr>sectionEnd)
+ RETURN_FAILURE(KErrCorrupt); // overflows relocation section
+
+ // read block header...
+ TUint pageOffset = block->iPageOffset;
+ TUint blockSize = block->iBlockSize;
+ E32IMAGEHEADER_TRACE(("E32RelocSection block 0x%x 0x%x",pageOffset,blockSize));
+ if(pageOffset&0xfff)
+ RETURN_FAILURE(KErrCorrupt); // not page aligned
+ if(blockSize<sizeof(E32RelocBlock))
+ RETURN_FAILURE(KErrCorrupt); // blockSize must be at least that of the header just read
+ if(blockSize&3)
+ RETURN_FAILURE(KErrCorrupt); // not word aligned
+
+ // caculate end of entries in this block...
+ TUint16* entryEnd = (TUint16*)(p+blockSize);
+ if(entryEnd<entryPtr)
+ RETURN_FAILURE(KErrCorrupt); // math overflow
+ if(entryEnd>(TUint16*)sectionEnd)
+ RETURN_FAILURE(KErrCorrupt); // overflows relocation section
+
+ // process each entry in this block...
+ while(entryPtr<entryEnd)
+ {
+ TUint entry = *entryPtr++;
+ E32IMAGEHEADER_TRACE(("E32RelocSection entry 0x%04x",entry));
+ if(!entry)
+ continue;
+
+ // check relocation type...
+ TUint entryType = entry&0xf000;
+ if(entryType!=KTextRelocType && entryType!=KDataRelocType && entryType!=KInferredRelocType)
+ RETURN_FAILURE(KErrCorrupt);
+
+ // check relocation is within section being relocated...
+ TUint offset = pageOffset+(entry&0x0fff);
+ if(offset>=aRelocatedSectionSize || offset+4>aRelocatedSectionSize)
+ RETURN_FAILURE(KErrCorrupt); // not within section
+ if(offset&pointerAlignMask)
+ RETURN_FAILURE(KErrCorrupt); // not aligned correctly
+
+ // count each relocation processed...
+ --relocsRemaining;
+ }
+
+ // next sub block...
+ p = (TUint8*)entryEnd;
+ }
+
+ // check number of relocations in section header is correct...
+ E32IMAGEHEADER_TRACE(("E32RelocSection relocsRemaining=%d",relocsRemaining));
+ if(relocsRemaining)
+ RETURN_FAILURE(KErrCorrupt); // incorrect number of entries
+
+ aRelocationSection = sectionHeader;
+ return KErrNone;
+ }
+
+
+/**
+Validate an import section.
+
+For PE format imports, this also verifies that the Import Address Table fits within the code
+part of the image.
+
+@param aBufferStart Start of buffer containing the data after the code part in the image file.
+@param aBufferSize Size of data at aBufferStart.
+@param[out] aBiggestImportCount Largest number of imports the image has from any single dependency.
+
+@return KErrNone if section is valid (or absent), else KErrCorrupt.
+*/
+TInt E32ImageHeaderV::ValidateImports(TAny* aBufferStart, TUint aBufferSize, TUint& aBiggestImportCount) const
+ {
+ if(!iImportOffset)
+ {
+ aBiggestImportCount = 0;
+ return KErrNone; // no imports
+ }
+
+ // get alignment requirements...
+ TCpu cpu = (TCpu)iCpuIdentifier;
+ TBool isARM = (cpu==ECpuArmV4 || cpu==ECpuArmV5 || cpu==ECpuArmV6);
+ TUint32 pointerAlignMask = isARM ? 3 : 0; // mask of bits which must be zero for aligned pointers/offsets
+
+ // buffer pointer to read imports from...
+ TUint8* bufferStart = (TUint8*)aBufferStart;
+ TUint8* bufferEnd = bufferStart+aBufferSize;
+ TUint baseOffset = iCodeOffset+iCodeSize; // file offset for aBufferStart
+ TUint8* sectionStart = (bufferStart+iImportOffset-baseOffset);
+ TUint8* p = sectionStart;
+
+ // read section header (ValidateHeader has alread checked this is OK)...
+ E32ImportSection* sectionHeader = (E32ImportSection*)p;
+ TUint size = sectionHeader->iSize;
+ E32IMAGEHEADER_TRACE(("E32ImportSection 0x%x",size));
+
+ // check section lies within buffer...
+ p = (TUint8*)(sectionHeader+1); // start of first import block
+ TUint8* sectionEnd = sectionStart+size;
+ if(sectionEnd<p)
+ RETURN_FAILURE(KErrCorrupt); // math overflow or not big enough to contain header
+ if(sectionEnd>bufferEnd)
+ RETURN_FAILURE(KErrCorrupt); // overflows buffer
+
+ // process each import block...
+ TUint numDeps = iDllRefTableCount;
+ TUint biggestImportCount = 0;
+ TUint totalImports = 0;
+ TUint importFormat = iFlags&KImageImpFmtMask;
+ while(numDeps--)
+ {
+ // get block header...
+ E32ImportBlock* block = (E32ImportBlock*)p;
+ p = (TUint8*)(block+1);
+ if(p<(TUint8*)block || p>sectionEnd)
+ RETURN_FAILURE(KErrCorrupt); // overflows buffer
+
+ E32IMAGEHEADER_TRACE(("E32ImportBlock 0x%x %d",block->iOffsetOfDllName,block->iNumberOfImports));
+
+ // check import dll name is within section...
+ TUint8* name = sectionStart+block->iOffsetOfDllName;
+ if(name<sectionStart || name>=sectionEnd)
+ RETURN_FAILURE(KErrCorrupt); // not within import section
+ while(*name++ && name<sectionEnd)
+ {}
+ if(name[-1])
+ RETURN_FAILURE(KErrCorrupt); // name overflows section
+ E32IMAGEHEADER_TRACE(("E32ImportBlock %s",sectionStart+block->iOffsetOfDllName));
+
+ // process import count...
+ TUint numberOfImports = block->iNumberOfImports;
+ if(numberOfImports>=0x80000000u/sizeof(TUint32))
+ RETURN_FAILURE(KErrCorrupt); // size doesn't fit into a signed integer
+ if(numberOfImports>biggestImportCount)
+ biggestImportCount = numberOfImports;
+ totalImports += numberOfImports;
+
+ // process import data...
+
+ // PE2 doesn't have any more data...
+ if(importFormat==KImageImpFmt_PE2)
+ continue;
+
+ // get import data range...
+ TUint32* imports = (TUint32*)p;
+ TUint32* importsEnd = imports+numberOfImports;
+ if(importsEnd<imports)
+ RETURN_FAILURE(KErrCorrupt); // math overflow. Fuzzer can't trigger this because needs aBufferStart to be in to be >0x80000000
+ if(importsEnd>(TUint32*)sectionEnd)
+ RETURN_FAILURE(KErrCorrupt); // overflows buffer
+
+ // move pointer on to next block...
+ p = (TUint8*)importsEnd;
+
+ if(importFormat==KImageImpFmt_ELF)
+ {
+ // check imports are in code section...
+ TUint32 limit = iCodeSize-sizeof(TUint32);
+ while(imports<importsEnd)
+ {
+ TUint32 i = *imports++;
+ if(i>limit)
+ RETURN_FAILURE(KErrCorrupt);
+ if(i&pointerAlignMask)
+ RETURN_FAILURE(KErrCorrupt); // not word aligned
+ }
+ }
+ else if(importFormat==KImageImpFmt_PE)
+ {
+ // import data is not used, so don't bother checking it
+ }
+ else
+ {
+ RETURN_FAILURE(KErrCorrupt); // bad import format, Fuzzer can't trigger this because import format checked by header validation
+ }
+
+ // next block...
+ p = (TUint8*)block->NextBlock(importFormat);
+ }
+
+ // done processing imports; for PE derived files now check import address table (IAT)...
+ if(importFormat==KImageImpFmt_PE || importFormat==KImageImpFmt_PE2)
+ {
+ if(totalImports>=0x80000000u/sizeof(TUint32))
+ RETURN_FAILURE(KErrCorrupt); // size doesn't fit into a signed integer
+ TUint importAddressTable = iTextSize; // offset for IAT
+ if(importAddressTable&pointerAlignMask)
+ RETURN_FAILURE(KErrCorrupt); // Fuzzer can't trigger this because PE imports are for X86 which doesn't have alignment restrictions
+ TUint importAddressTableEnd = importAddressTable+sizeof(TUint32)*totalImports;
+ if(importAddressTableEnd<importAddressTable || importAddressTableEnd>TUint(iCodeSize))
+ RETURN_FAILURE(KErrCorrupt); // import address table overflows code part of file
+ E32IMAGEHEADER_TRACE(("E32ImportSection IAT offsets 0x%x..0x%x",importAddressTable,importAddressTableEnd));
+ }
+
+ aBiggestImportCount = biggestImportCount;
+ return KErrNone;
+ }
+
+
+
+
+/**
+Validate a whole executable image.
+
+This runs all of the other validation methods in turn.
+
+@param aBufferStart Start of buffer containing the data after the header part of an image file.
+@param aBufferSize Size of data at aBufferStart.
+
+@return KErrNone if image is valid, else KErrCorrupt or KErrNotSupported.
+*/
+TInt E32ImageHeaderV::ValidateWholeImage(TAny* aBufferStart, TUint aBufferSize) const
+ {
+ TUint32 dummyUncompressedSize;
+ TInt r = ValidateHeader(TotalSize()+aBufferSize,dummyUncompressedSize);
+ if(r!=KErrNone)
+ return r;
+
+ TInt endOfCodeOffset = iCodeSize;
+ void* restOfFileData = ((TUint8*)aBufferStart)+endOfCodeOffset;
+ TInt restOfFileSize = aBufferSize-endOfCodeOffset;
+
+ E32RelocSection* dummy;
+ r = ValidateRelocations(restOfFileData,restOfFileSize,iCodeRelocOffset,iCodeSize,dummy);
+ if(r!=KErrNone)
+ return r;
+ r = ValidateRelocations(restOfFileData,restOfFileSize,iDataRelocOffset,iDataSize,dummy);
+ if(r!=KErrNone)
+ return r;
+
+ TUint biggestImportCount;
+ r = ValidateImports(restOfFileData,restOfFileSize,biggestImportCount);
+ if(r!=KErrNone)
+ return r;
+
+ return r;
+ }
+
+
+#endif // INCLUDE_E32IMAGEHEADER_IMPLEMENTATION
+
+
+#endif // __F32IMAGE_H__
+
+