diff options
Diffstat (limited to 'src/VBox/Runtime/common/ldr/ldrVfsFile.cpp')
| -rw-r--r-- | src/VBox/Runtime/common/ldr/ldrVfsFile.cpp | 283 |
1 files changed, 283 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/ldr/ldrVfsFile.cpp b/src/VBox/Runtime/common/ldr/ldrVfsFile.cpp new file mode 100644 index 00000000..24df28ca --- /dev/null +++ b/src/VBox/Runtime/common/ldr/ldrVfsFile.cpp @@ -0,0 +1,283 @@ +/* $Id: ldrVfsFile.cpp $ */ +/** @file + * IPRT - Binary Image Loader, The File Oriented Parts, VFS variant. + */ + +/* + * Copyright (C) 2006-2019 Oracle Corporation + * + * This file is part of VirtualBox Open Source Edition (OSE), as + * available from http://www.virtualbox.org. This file is free software; + * you can redistribute it and/or modify it under the terms of the GNU + * General Public License (GPL) as published by the Free Software + * Foundation, in version 2 as it comes in the "COPYING" file of the + * VirtualBox OSE distribution. VirtualBox OSE is distributed in the + * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. + * + * The contents of this file may alternatively be used under the terms + * of the Common Development and Distribution License Version 1.0 + * (CDDL) only, as it comes in the "COPYING.CDDL" file of the + * VirtualBox OSE distribution, in which case the provisions of the + * CDDL are applicable instead of those of the GPL. + * + * You may elect to license modified versions of this file under the + * terms and conditions of either the GPL or the CDDL or both. + */ + + +/********************************************************************************************************************************* +* Header Files * +*********************************************************************************************************************************/ +#define LOG_GROUP RTLOGGROUP_LDR +#include <iprt/ldr.h> +#include "internal/iprt.h" + +#include <iprt/alloc.h> +#include <iprt/file.h> +#include <iprt/assert.h> +#include <iprt/log.h> +#include <iprt/err.h> +#include <iprt/string.h> +#include <iprt/vfs.h> +#include <iprt/formats/mz.h> +#include "internal/ldr.h" + + +/********************************************************************************************************************************* +* Structures and Typedefs * +*********************************************************************************************************************************/ +/** + * VFS file Reader instance. + * This provides raw image bits from a file. + */ +typedef struct RTLDRREADERVFSFILE +{ + /** The core. */ + RTLDRREADER Core; + /** The VFS file. */ + RTVFSFILE hVfsFile; + /** Number of users or the mapping. */ + RTUINT cMappings; + /** Pointer to the in memory mapping. */ + void *pvMapping; + /** The filename (variable size). */ + char szFilename[1]; +} RTLDRREADERVFSFILE; +typedef RTLDRREADERVFSFILE *PRTLDRREADERVFSFILE; + + +/** @copydoc RTLDRREADER::pfnRead */ +static DECLCALLBACK(int) rtldrVfsFileRead(PRTLDRREADER pReader, void *pvBuf, size_t cb, RTFOFF off) +{ + PRTLDRREADERVFSFILE pFileReader = (PRTLDRREADERVFSFILE)pReader; + return RTVfsFileReadAt(pFileReader->hVfsFile, off, pvBuf, cb, NULL); +} + + +/** @copydoc RTLDRREADER::pfnTell */ +static DECLCALLBACK(RTFOFF) rtldrVfsFileTell(PRTLDRREADER pReader) +{ + PRTLDRREADERVFSFILE pFileReader = (PRTLDRREADERVFSFILE)pReader; + return RTVfsFileTell(pFileReader->hVfsFile); +} + + +/** @copydoc RTLDRREADER::pfnSize */ +static DECLCALLBACK(RTFOFF) rtldrVfsFileSize(PRTLDRREADER pReader) +{ + PRTLDRREADERVFSFILE pFileReader = (PRTLDRREADERVFSFILE)pReader; + uint64_t cbFile; + int rc = RTVfsFileGetSize(pFileReader->hVfsFile, &cbFile); + if (RT_SUCCESS(rc)) + return cbFile; + return 0; +} + + +/** @copydoc RTLDRREADER::pfnLogName */ +static DECLCALLBACK(const char *) rtldrVfsFileLogName(PRTLDRREADER pReader) +{ + PRTLDRREADERVFSFILE pFileReader = (PRTLDRREADERVFSFILE)pReader; + return pFileReader->szFilename; +} + + +/** @copydoc RTLDRREADER::pfnMap */ +static DECLCALLBACK(int) rtldrVfsFileMap(PRTLDRREADER pReader, const void **ppvBits) +{ + PRTLDRREADERVFSFILE pFileReader = (PRTLDRREADERVFSFILE)pReader; + + /* + * Already mapped? + */ + if (pFileReader->pvMapping) + { + pFileReader->cMappings++; + *ppvBits = pFileReader->pvMapping; + return VINF_SUCCESS; + } + + /* + * Allocate memory. + */ + RTFOFF cbFile = rtldrVfsFileSize(pReader); + size_t cb = (size_t)cbFile; + if ((RTFOFF)cb != cbFile) + return VERR_IMAGE_TOO_BIG; + pFileReader->pvMapping = RTMemAlloc(cb); + if (!pFileReader->pvMapping) + return VERR_NO_MEMORY; + int rc = rtldrVfsFileRead(pReader, pFileReader->pvMapping, cb, 0); + if (RT_SUCCESS(rc)) + { + pFileReader->cMappings = 1; + *ppvBits = pFileReader->pvMapping; + } + else + { + RTMemFree(pFileReader->pvMapping); + pFileReader->pvMapping = NULL; + } + + return rc; +} + + +/** @copydoc RTLDRREADER::pfnUnmap */ +static DECLCALLBACK(int) rtldrVfsFileUnmap(PRTLDRREADER pReader, const void *pvBits) +{ + PRTLDRREADERVFSFILE pFileReader = (PRTLDRREADERVFSFILE)pReader; + AssertReturn(pFileReader->cMappings > 0, VERR_INVALID_PARAMETER); + + if (!--pFileReader->cMappings) + { + RTMemFree(pFileReader->pvMapping); + pFileReader->pvMapping = NULL; + } + + NOREF(pvBits); + return VINF_SUCCESS; +} + + +/** @copydoc RTLDRREADER::pfnDestroy */ +static DECLCALLBACK(int) rtldrVfsFileDestroy(PRTLDRREADER pReader) +{ + PRTLDRREADERVFSFILE pFileReader = (PRTLDRREADERVFSFILE)pReader; + if (pFileReader->hVfsFile != NIL_RTVFSFILE) + { + RTVfsFileRelease(pFileReader->hVfsFile); + pFileReader->hVfsFile = NIL_RTVFSFILE; + } + RTMemFree(pFileReader); + return VINF_SUCCESS; +} + + +/** + * Opens a loader file reader. + * + * @returns iprt status code. + * @param pszFilename The file to open, can be VFS chain. + * @param ppReader Where to store the reader instance on success. + * @param poffError Where to return the offset into @a pszFilename of an VFS + * chain element causing trouble. Optional. + * @param pErrInfo Where to return extended error information. Optional. + */ +static int rtldrVfsFileCreate(const char *pszFilename, PRTLDRREADER *ppReader, uint32_t *poffError, PRTERRINFO pErrInfo) +{ + size_t cbFilename = strlen(pszFilename) + 1; + int rc = VERR_NO_MEMORY; + PRTLDRREADERVFSFILE pFileReader = (PRTLDRREADERVFSFILE)RTMemAlloc(RT_UOFFSETOF_DYN(RTLDRREADERVFSFILE, szFilename[cbFilename])); + if (pFileReader) + { + memcpy(pFileReader->szFilename, pszFilename, cbFilename); + pFileReader->szFilename[0] = '\0'; + rc = RTVfsChainOpenFile(pszFilename, RTFILE_O_READ | RTFILE_O_OPEN | RTFILE_O_DENY_WRITE, &pFileReader->hVfsFile, + poffError, pErrInfo); + if (RT_SUCCESS(rc)) + { + pFileReader->Core.uMagic = RTLDRREADER_MAGIC; + pFileReader->Core.pfnRead = rtldrVfsFileRead; + pFileReader->Core.pfnTell = rtldrVfsFileTell; + pFileReader->Core.pfnSize = rtldrVfsFileSize; + pFileReader->Core.pfnLogName = rtldrVfsFileLogName; + pFileReader->Core.pfnMap = rtldrVfsFileMap; + pFileReader->Core.pfnUnmap = rtldrVfsFileUnmap; + pFileReader->Core.pfnDestroy = rtldrVfsFileDestroy; + pFileReader->cMappings = 0; + pFileReader->pvMapping = NULL; + *ppReader = &pFileReader->Core; + return VINF_SUCCESS; + } + RTMemFree(pFileReader); + } + *ppReader = NULL; + return rc; +} + + +/** + * Open a binary image file allowing VFS chains in the filename. + * + * @returns iprt status code. + * @param pszFilename Image filename, VFS chain specifiers allowed. + * @param fFlags Valid RTLDR_O_XXX combination. + * @param enmArch CPU architecture specifier for the image to be loaded. + * @param phLdrMod Where to store the handle to the loader module. + * @param poffError Where to return the offset into @a pszFilename of an VFS + * chain element causing trouble. Optional. + * @param pErrInfo Where to return extended error information. Optional. + */ +RTDECL(int) RTLdrOpenVfsChain(const char *pszFilename, uint32_t fFlags, RTLDRARCH enmArch, + PRTLDRMOD phLdrMod, uint32_t *poffError, PRTERRINFO pErrInfo) +{ + LogFlow(("RTLdrOpenVfsChain: pszFilename=%p:{%s} fFlags=%#x enmArch=%d phLdrMod=%p\n", + pszFilename, pszFilename, fFlags, enmArch, phLdrMod)); + AssertMsgReturn(!(fFlags & ~RTLDR_O_VALID_MASK), ("%#x\n", fFlags), VERR_INVALID_PARAMETER); + AssertMsgReturn(enmArch > RTLDRARCH_INVALID && enmArch < RTLDRARCH_END, ("%d\n", enmArch), VERR_INVALID_PARAMETER); + + /* + * Create file reader & invoke worker which identifies and calls the image interpreter. + */ + PRTLDRREADER pReader; + int rc = rtldrVfsFileCreate(pszFilename, &pReader, poffError, pErrInfo); + if (RT_SUCCESS(rc)) + { + if (poffError) + *poffError = 0; + rc = RTLdrOpenWithReader(pReader, fFlags, enmArch, phLdrMod, pErrInfo); + if (RT_SUCCESS(rc)) + { + LogFlow(("RTLdrOpenEx: return %Rrc *phLdrMod=%p\n", rc, *phLdrMod)); + return rc; + } + pReader->pfnDestroy(pReader); + } + *phLdrMod = NIL_RTLDRMOD; + LogFlow(("RTLdrOpenEx: return %Rrc\n", rc)); + return rc; +} +RT_EXPORT_SYMBOL(RTLdrOpenVfsChain); + + +/** + * Open a binary image file using kLdr allowing VFS chains in the filename. + * + * @returns iprt status code. + * @param pszFilename Image filename. + * @param fFlags Reserved, MBZ. + * @param enmArch CPU architecture specifier for the image to be loaded. + * @param phLdrMod Where to store the handle to the loaded module. + * @param poffError Where to return the offset into @a pszFilename of an VFS + * chain element causing trouble. Optional. + * @param pErrInfo Where to return extended error information. Optional. + * @remark Primarily for testing the loader. + */ +RTDECL(int) RTLdrOpenVfsChainkLdr(const char *pszFilename, uint32_t fFlags, RTLDRARCH enmArch, + PRTLDRMOD phLdrMod, uint32_t *poffError, PRTERRINFO pErrInfo) +{ + return RTLdrOpenVfsChain(pszFilename, fFlags, enmArch, phLdrMod, poffError, pErrInfo); +} +RT_EXPORT_SYMBOL(RTLdrOpenVfsChainkLdr); + |