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--- dyld/dyld-1241.17/common/ClosureFileSystemPhysical.cpp
+++ /dev/null
@@ -1,306 +0,0 @@
-/*
- * Copyright (c) 2017 Apple Inc. All rights reserved.
- *
- * @APPLE_LICENSE_HEADER_START@
- *
- * This file contains Original Code and/or Modifications of Original Code
- * as defined in and that are subject to the Apple Public Source License
- * Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
- *
- * The Original Code and all software distributed under the License are
- * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- * Please see the License for the specific language governing rights and
- * limitations under the License.
- *
- * @APPLE_LICENSE_HEADER_END@
- */
-
-#include "ClosureFileSystemPhysical.h"
-
-#include <TargetConditionals.h>
-
-#include <string.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <sys/errno.h>
-#include <sys/mman.h>
-#include <sys/stat.h>
-#include <mach/mach.h>
-#if !TARGET_OS_SIMULATOR && !TARGET_OS_DRIVERKIT
- #include <sandbox.h>
- #include <sandbox/private.h>
-#endif
-#include <TargetConditionals.h>
-#include "MachOFile.h"
-#include "MachOAnalyzer.h"
-
-using dyld3::closure::FileSystemPhysical;
-
-bool FileSystemPhysical::getRealPath(const char possiblePath[MAXPATHLEN], char realPath[MAXPATHLEN]) const {
- __block bool success = false;
- // first pass: open file and ask kernel for canonical path
- forEachPath(possiblePath, ^(const char* aPath, unsigned prefixLen, bool& stop) {
- int fd = dyld3::open(aPath, O_RDONLY, 0);
- if ( fd != -1 ) {
- char tempPath[MAXPATHLEN];
- success = (fcntl(fd, F_GETPATH, tempPath) == 0);
- ::close(fd);
- if ( success ) {
- // if prefix was used, remove it
- strcpy(realPath, &tempPath[prefixLen]);
- }
- stop = true;
- }
- });
- if (success)
- return success;
-
- // second pass: file does not exist but may be a symlink to a non-existent file
- // This is only for use on-device on platforms where dylibs are removed
- if ( _overlayPath == nullptr && _rootPath == nullptr ) {
- realpath(possiblePath, realPath);
- int realpathErrno = errno;
- // If realpath() resolves to a path which does not exist on disk, errno is set to ENOENT
- success = (realpathErrno == ENOENT) || (realpathErrno == 0);
- }
- return success;
-}
-
-static bool sandboxBlocked(const char* path, const char* kind)
-{
-#if TARGET_OS_SIMULATOR || TARGET_OS_DRIVERKIT
- // sandbox calls not yet supported in dyld_sim
- return false;
-#else
- sandbox_filter_type filter = (sandbox_filter_type)(SANDBOX_FILTER_PATH | SANDBOX_CHECK_NO_REPORT);
- return ( sandbox_check(getpid(), kind, filter, path) > 0 );
-#endif
-}
-
-static bool sandboxBlockedMmap(const char* path)
-{
- return sandboxBlocked(path, "file-map-executable");
-}
-
-static bool sandboxBlockedOpen(const char* path)
-{
- return sandboxBlocked(path, "file-read-data");
-}
-
-static bool sandboxBlockedStat(const char* path)
-{
- return sandboxBlocked(path, "file-read-metadata");
-}
-
-void FileSystemPhysical::forEachPath(const char* path, void (^handler)(const char* fullPath, unsigned prefixLen, bool& stop)) const
-{
- bool stop = false;
- char altPath[PATH_MAX];
- if ( _overlayPath != nullptr ) {
- strlcpy(altPath, _overlayPath, PATH_MAX);
- strlcat(altPath, path, PATH_MAX);
- handler(altPath, (unsigned)strlen(_overlayPath), stop);
- if ( stop )
- return;
- }
- if ( _rootPath != nullptr ) {
- strlcpy(altPath, _rootPath, PATH_MAX);
- if ( path[0] != '/' )
- strlcat(altPath, "/", PATH_MAX);
- strlcat(altPath, path, PATH_MAX);
- handler(altPath, (unsigned)strlen(_rootPath), stop);
- if ( stop )
- return;
- }
- else {
- handler(path, 0, stop);
- }
-}
-
-static bool isFileRelativePath(const char* path)
-{
- if ( path[0] == '/' )
- return false;
- if ( path[0] != '.' )
- return true;
- if ( path[1] == '/' )
- return true;
- if ( (path[1] == '.') && (path[2] == '/') )
- return true;
- return false;
-}
-
-// Returns true on success. If an error occurs the given callback will be called with the reason.
-// On success, info is filled with info about the loaded file. If the path supplied includes a symlink,
-// the supplier realerPath is filled in with the real path of the file, otherwise it is set to the empty string.
-bool FileSystemPhysical::loadFile(const char* path, LoadedFileInfo& info, char realerPath[MAXPATHLEN], void (^error)(const char* format, ...)) const {
- if ( !_allowRelativePaths && isFileRelativePath(path) ) {
- error("relative file paths not allowed '%s'", path);
- return false;
- }
- // open file
- __block int fd;
- __block struct stat statBuf;
- forEachPath(path, ^(const char* aPath, unsigned prefixLen, bool& stop) {
- fd = dyld3::open(aPath, O_RDONLY, 0);
- if ( fd == -1 ) {
- int openErrno = errno;
- if ( (openErrno == EPERM) && sandboxBlockedOpen(path) )
- error("file system sandbox blocked open(\"%s\", O_RDONLY)", path);
- else if ( (openErrno != ENOENT) && (openErrno != ENOTDIR) )
- error("open(\"%s\", O_RDONLY) failed with errno=%d", path, openErrno);
- }
- else {
- // get file info
- if ( ::fstat(fd, &statBuf) != 0 ) {
- int statErr = errno;
- if ( (statErr == EPERM) && sandboxBlockedStat(path) )
- error("file system sandbox blocked stat(\"%s\")", path);
- else
- error("stat(\"%s\") failed with errno=%d", path, errno);
- ::close(fd);
- fd = -1;
- }
- else {
- // Get the realpath of the file if it is a symlink
- char tempPath[MAXPATHLEN];
- if ( fcntl(fd, F_GETPATH, tempPath) == 0 ) {
- const char* realPathWithin = &tempPath[prefixLen];
- // Don't set the realpath if it is just the same as the regular path
- if ( strcmp(path, realPathWithin) == 0 ) {
- // zero out realerPath if path is fine as-is
- // <rdar://45018392> don't trash input 'path' if realerPath is same buffer as path
- if ( realerPath != path )
- realerPath[0] = '\0';
- }
- else
- strcpy(realerPath, realPathWithin);
- stop = true;
- }
- else {
- error("Could not get real path for \"%s\"\n", path);
- ::close(fd);
- fd = -1;
- }
- }
- }
- });
- if ( fd == -1 )
- return false;
-
- // only regular files can be loaded
- if ( !S_ISREG(statBuf.st_mode) ) {
- error("not a file for %s", path);
- ::close(fd);
- return false;
- }
-
- // mach-o files must be at list one page in size
- if ( statBuf.st_size < 4096 ) {
- error("file too short %s", path);
- ::close(fd);
- return false;
- }
-
- info.fileContent = nullptr;
- info.fileContentLen = statBuf.st_size;
- info.sliceOffset = 0;
- info.sliceLen = statBuf.st_size;
- info.isOSBinary = false;
- info.inode = statBuf.st_ino;
- info.mtime = statBuf.st_mtime;
- info.path = path;
-
- // mmap() whole file
- void* wholeFile = ::mmap(nullptr, (size_t)statBuf.st_size, PROT_READ, MAP_PRIVATE|MAP_RESILIENT_CODESIGN, fd, 0);
- if ( wholeFile == MAP_FAILED ) {
- int mmapErr = errno;
- if ( mmapErr == EPERM ) {
- if ( sandboxBlockedMmap(path) )
- error("file system sandbox blocked mmap() of '%s'", path);
- else
- error("code signing blocked mmap() of '%s'", path);
- }
- else {
- error("mmap() failed with errno=%d for %s", errno, path);
- }
- ::close(fd);
- return false;
- }
- info.fileContent = wholeFile;
-
- // if this is an arm64e mach-o or a fat file with an arm64e slice we need to record if it is an OS binary
-#if TARGET_OS_OSX && __arm64e__
- const MachOAnalyzer* ma = (MachOAnalyzer*)wholeFile;
- if ( ma->hasMachOMagic() ) {
- if ( (ma->cputype == CPU_TYPE_ARM64) && ((ma->cpusubtype & ~CPU_SUBTYPE_MASK) == CPU_SUBTYPE_ARM64E) ) {
- if ( ma->isOSBinary(fd, 0, info.fileContentLen) )
- info.isOSBinary = true;
- }
- }
- else if ( const FatFile* fat = FatFile::isFatFile(wholeFile) ) {
- Diagnostics diag;
- fat->forEachSlice(diag, info.fileContentLen, ^(uint32_t sliceCpuType, uint32_t sliceCpuSubType, const void* sliceStart, uint64_t sliceSize, bool& stop) {
- if ( (sliceCpuType == CPU_TYPE_ARM64) && ((sliceCpuSubType & ~CPU_SUBTYPE_MASK) == CPU_SUBTYPE_ARM64E) ) {
- uint64_t sliceOffset = (uint8_t*)sliceStart-(uint8_t*)wholeFile;
- const MachOAnalyzer* sliceMA = (MachOAnalyzer*)((uint8_t*)wholeFile + sliceOffset);
- if ( sliceMA->isOSBinary(fd, sliceOffset, sliceSize) )
- info.isOSBinary = true;
- }
- });
- }
-#endif
- // Set unmap as the unload method.
- info.unload = [](const LoadedFileInfo& info) {
- ::munmap((void*)info.fileContent, (size_t)info.fileContentLen);
- };
-
- ::close(fd);
- return true;
-}
-
-void FileSystemPhysical::unloadFile(const LoadedFileInfo& info) const {
- if (info.unload)
- info.unload(info);
-}
-
-void FileSystemPhysical::unloadPartialFile(LoadedFileInfo& info, uint64_t keepStartOffset, uint64_t keepLength) const {
- // Unmap from 0..keepStartOffset and (keepStartOffset+keepLength)..info.fileContentLen
- if (keepStartOffset)
- ::munmap((void*)info.fileContent, (size_t)trunc_page(keepStartOffset));
- if ((keepStartOffset + keepLength) != info.fileContentLen) {
- uintptr_t start = round_page((uintptr_t)info.fileContent + keepStartOffset + keepLength);
- uintptr_t end = (uintptr_t)info.fileContent + (uintptr_t)info.fileContentLen;
- ::munmap((void*)start, end - start);
- }
- info.fileContent = (const void*)((char*)info.fileContent + keepStartOffset);
- info.fileContentLen = keepLength;
-}
-
-bool FileSystemPhysical::fileExists(const char* path, uint64_t* inode, uint64_t* mtime,
- bool* issetuid, bool* inodesMatchRuntime) const {
- __block bool result = false;
- forEachPath(path, ^(const char* aPath, unsigned prefixLen, bool& stop) {
- struct stat statBuf;
- if ( dyld3::stat(aPath, &statBuf) == 0 ) {
- if (inode)
- *inode = statBuf.st_ino;
- if (mtime)
- *mtime = statBuf.st_mtime;
- if (issetuid)
- *issetuid = (statBuf.st_mode & (S_ISUID|S_ISGID));
- if (inodesMatchRuntime)
- *inodesMatchRuntime = true;
- stop = true;
- result = true;
- }
- });
- return result;
-}