| 1 | /* $Id: ldrNative-posix.cpp 79559 2019-07-05 15:42:51Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - Binary Image Loader, POSIX native.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2019 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | */
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| 26 |
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| 27 |
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| 28 | /*********************************************************************************************************************************
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| 29 | * Header Files *
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| 30 | *********************************************************************************************************************************/
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| 31 | #define LOG_GROUP RTLOGGROUP_LDR
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| 32 | #include <dlfcn.h>
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| 33 |
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| 34 | #include <iprt/ldr.h>
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| 35 | #include <iprt/assert.h>
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| 36 | #include <iprt/path.h>
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| 37 | #include <iprt/alloca.h>
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| 38 | #include <iprt/string.h>
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| 39 | #include <iprt/err.h>
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| 40 | #include <iprt/log.h>
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| 41 | #include "internal/ldr.h"
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| 42 |
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| 43 |
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| 44 | /*********************************************************************************************************************************
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| 45 | * Global Variables *
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| 46 | *********************************************************************************************************************************/
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| 47 | #if defined(RT_OS_OS2) || defined(RT_OS_WINDOWS)
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| 48 | static const char g_szSuff[] = ".DLL";
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| 49 | #elif defined(RT_OS_L4)
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| 50 | static const char g_szSuff[] = ".s.so";
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| 51 | #elif defined(RT_OS_DARWIN)
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| 52 | static const char g_szSuff[] = ".dylib";
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| 53 | #else
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| 54 | static const char g_szSuff[] = ".so";
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| 55 | #endif
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| 56 |
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| 57 |
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| 58 | DECLHIDDEN(int) rtldrNativeLoad(const char *pszFilename, uintptr_t *phHandle, uint32_t fFlags, PRTERRINFO pErrInfo)
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| 59 | {
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| 60 | /*
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| 61 | * Do we need to add an extension?
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| 62 | */
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| 63 | if (!RTPathHasSuffix(pszFilename) && !(fFlags & RTLDRLOAD_FLAGS_NO_SUFFIX))
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| 64 | {
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| 65 | size_t cch = strlen(pszFilename);
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| 66 | char *psz = (char *)alloca(cch + sizeof(g_szSuff));
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| 67 | if (!psz)
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| 68 | return RTErrInfoSet(pErrInfo, VERR_NO_MEMORY, "alloca failed");
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| 69 | memcpy(psz, pszFilename, cch);
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| 70 | memcpy(psz + cch, g_szSuff, sizeof(g_szSuff));
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| 71 | pszFilename = psz;
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| 72 | }
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| 73 |
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| 74 | /*
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| 75 | * Attempt load.
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| 76 | */
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| 77 | int fFlagsNative = RTLD_NOW;
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| 78 | if (fFlags & RTLDRLOAD_FLAGS_GLOBAL)
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| 79 | fFlagsNative |= RTLD_GLOBAL;
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| 80 | else
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| 81 | fFlagsNative |= RTLD_LOCAL;
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| 82 | void *pvMod = dlopen(pszFilename, fFlagsNative);
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| 83 | if (pvMod)
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| 84 | {
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| 85 | *phHandle = (uintptr_t)pvMod;
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| 86 | return VINF_SUCCESS;
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| 87 | }
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| 88 |
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| 89 | const char *pszDlError = dlerror();
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| 90 | RTErrInfoSet(pErrInfo, VERR_FILE_NOT_FOUND, pszDlError);
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| 91 | LogRel(("rtldrNativeLoad: dlopen('%s', RTLD_NOW | RTLD_LOCAL) failed: %s\n", pszFilename, pszDlError));
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| 92 | return VERR_FILE_NOT_FOUND;
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| 93 | }
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| 94 |
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| 95 |
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| 96 | DECLCALLBACK(int) rtldrNativeGetSymbol(PRTLDRMODINTERNAL pMod, const char *pszSymbol, void **ppvValue)
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| 97 | {
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| 98 | PRTLDRMODNATIVE pModNative = (PRTLDRMODNATIVE)pMod;
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| 99 | #ifdef RT_OS_OS2
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| 100 | /* Prefix the symbol with an underscore (assuming __cdecl/gcc-default). */
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| 101 | size_t cch = strlen(pszSymbol);
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| 102 | char *psz = (char *)alloca(cch + 2);
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| 103 | psz[0] = '_';
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| 104 | memcpy(psz + 1, pszSymbol, cch + 1);
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| 105 | pszSymbol = psz;
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| 106 | #endif
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| 107 | *ppvValue = dlsym((void *)pModNative->hNative, pszSymbol);
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| 108 | if (*ppvValue)
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| 109 | return VINF_SUCCESS;
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| 110 | return VERR_SYMBOL_NOT_FOUND;
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| 111 | }
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| 112 |
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| 113 |
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| 114 | DECLCALLBACK(int) rtldrNativeClose(PRTLDRMODINTERNAL pMod)
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| 115 | {
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| 116 | PRTLDRMODNATIVE pModNative = (PRTLDRMODNATIVE)pMod;
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| 117 | #ifdef __SANITIZE_ADDRESS__
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| 118 | /* If we are compiled with enabled address sanitizer (gcc/llvm), don't
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| 119 | * unload the module to prevent <unknown module> in the stack trace */
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| 120 | pModNative->fFlags |= RTLDRLOAD_FLAGS_NO_UNLOAD;
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| 121 | #endif
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| 122 | if ( (pModNative->fFlags & RTLDRLOAD_FLAGS_NO_UNLOAD)
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| 123 | || !dlclose((void *)pModNative->hNative))
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| 124 | {
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| 125 | pModNative->hNative = (uintptr_t)0;
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| 126 | return VINF_SUCCESS;
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| 127 | }
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| 128 | Log(("rtldrNativeFree: dlclose(%p) failed: %s\n", pModNative->hNative, dlerror()));
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| 129 | return VERR_GENERAL_FAILURE;
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| 130 | }
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| 131 |
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| 132 |
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| 133 | DECLHIDDEN(int) rtldrNativeLoadSystem(const char *pszFilename, const char *pszExt, uint32_t fFlags, PRTLDRMOD phLdrMod)
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| 134 | {
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| 135 | /*
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| 136 | * For the present we ASSUME that we can trust dlopen to load what we want
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| 137 | * when not specifying a path. There seems to be very little we can do to
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| 138 | * restrict the places dlopen will search for library without doing
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| 139 | * auditing (linux) or something like that.
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| 140 | */
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| 141 | Assert(strchr(pszFilename, '/') == NULL);
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| 142 |
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| 143 | /* Easy if suffix was included. */
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| 144 | if (!pszExt)
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| 145 | return RTLdrLoadEx(pszFilename, phLdrMod, fFlags, NULL);
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| 146 |
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| 147 | /* Combine filename and suffix and then do the loading. */
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| 148 | size_t const cchFilename = strlen(pszFilename);
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| 149 | size_t const cchSuffix = strlen(pszExt);
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| 150 | char *pszTmp = (char *)alloca(cchFilename + cchSuffix + 16 + 1);
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| 151 | memcpy(pszTmp, pszFilename, cchFilename);
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| 152 | memcpy(&pszTmp[cchFilename], pszExt, cchSuffix);
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| 153 | pszTmp[cchFilename + cchSuffix] = '\0';
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| 154 |
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| 155 | int rc = RTLdrLoadEx(pszTmp, phLdrMod, fFlags, NULL);
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| 156 |
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| 157 | #if !defined(RT_OS_DARWIN) && !defined(RT_OS_OS2) && !defined(RT_OS_WINDOWS)
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| 158 | /*
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| 159 | * If no version was given after the .so and do .so.MAJOR search according
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| 160 | * to the range in the fFlags.
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| 161 | */
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| 162 | if (RT_FAILURE(rc) && !(fFlags & RTLDRLOAD_FLAGS_NO_SUFFIX))
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| 163 | {
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| 164 | const char *pszActualSuff = RTPathSuffix(pszTmp);
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| 165 | if (pszActualSuff && strcmp(pszActualSuff, ".so") == 0)
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| 166 | {
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| 167 | uint32_t const uBegin = (fFlags & RTLDRLOAD_FLAGS_SO_VER_BEGIN_MASK) >> RTLDRLOAD_FLAGS_SO_VER_BEGIN_SHIFT;
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| 168 | uint32_t const uEnd = (fFlags & RTLDRLOAD_FLAGS_SO_VER_END_MASK) >> RTLDRLOAD_FLAGS_SO_VER_END_SHIFT;
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| 169 | int32_t const iIncr = uBegin <= uEnd ? 1 : -1;
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| 170 | for (uint32_t uMajorVer = uBegin; uMajorVer != uEnd; uMajorVer += iIncr)
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| 171 | {
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| 172 | RTStrPrintf(&pszTmp[cchFilename + cchSuffix], 16 + 1, ".%u", uMajorVer);
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| 173 | rc = RTLdrLoadEx(pszTmp, phLdrMod, fFlags, NULL);
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| 174 | if (RT_SUCCESS(rc))
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| 175 | break;
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| 176 | }
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| 177 | }
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| 178 | }
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| 179 | #endif
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| 180 |
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| 181 | return rc;
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| 182 | }
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| 183 |
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