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+++ dyld/dyld-625.13/dyld3/ClosureFileSystemPhysical.cpp
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+/*
+ * 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 <fcntl.h>
+#include <stdlib.h>
+#include <sandbox.h>
+#include <sandbox/private.h>
+#include <unistd.h>
+#include <sys/errno.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+
+using dyld3::closure::FileSystemPhysical;
+
+bool FileSystemPhysical::getRealPath(const char possiblePath[MAXPATHLEN], char realPath[MAXPATHLEN]) const {
+ bool success = false;
+ int fd = ::open(possiblePath, O_RDONLY);
+ if ( fd != -1 ) {
+ success = fcntl(fd, F_GETPATH, realPath) == 0;
+ ::close(fd);
+ }
+ if (success)
+ return success;
+ realpath(possiblePath, realPath);
+ int realpathErrno = errno;
+ // If realpath() resolves to a path which does not exist on disk, errno is set to ENOENT
+ return (realpathErrno == ENOENT) || (realpathErrno == 0);
+}
+
+static bool sandboxBlocked(const char* path, const char* kind)
+{
+#if TARGET_IPHONE_SIMULATOR
+ // 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");
+}
+
+// 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 {
+ // open file
+ const char* originalPath = path;
+ char altPath[PATH_MAX];
+ int fd = -1;
+ if ( _fileSystemPrefix != nullptr ) {
+ strlcpy(altPath, _fileSystemPrefix, PATH_MAX);
+ strlcat(altPath, path, PATH_MAX);
+ fd = ::open(altPath, O_RDONLY, 0);
+ if ( fd != -1 )
+ path = altPath;
+ }
+ if ( fd == -1 ) {
+ fd = ::open(path, 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);
+ return false;
+ }
+ }
+
+ // Get the realpath of the file if it is a symlink
+ if ( fcntl(fd, F_GETPATH, realerPath) == 0 ) {
+ // Don't set the realpath if it is just the same as the regular path
+ if ( strcmp(originalPath, realerPath) == 0 )
+ realerPath[0] = '\0';
+ } else {
+ error("Could not get real path for \"%s\"\n", path);
+ ::close(fd);
+ return false;
+ }
+
+ // get file info
+ struct stat statBuf;
+#if TARGET_IPHONE_SIMULATOR
+ if ( ::stat(path, &statBuf) != 0 ) {
+#else
+ if ( ::fstat(fd, &statBuf) != 0 ) {
+#endif
+ 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);
+ 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.inode = statBuf.st_ino;
+ info.mtime = statBuf.st_mtime;
+ info.path = originalPath;
+
+ // 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;
+
+ // 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)keepStartOffset);
+ if ((keepStartOffset + keepLength) != info.fileContentLen) {
+ // Round up to page alignment
+ keepLength = (keepLength + PAGE_SIZE - 1) & (-PAGE_SIZE);
+ ::munmap((void*)((char*)info.fileContent + keepStartOffset + keepLength), (size_t)(info.fileContentLen - (keepStartOffset + keepLength)));
+ }
+ 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) const {
+ struct stat statBuf;
+ if ( _fileSystemPrefix != nullptr ) {
+ char altPath[PATH_MAX];
+ strlcpy(altPath, _fileSystemPrefix, PATH_MAX);
+ strlcat(altPath, path, PATH_MAX);
+ if ( ::stat(altPath, &statBuf) == 0 ) {
+ if (inode)
+ *inode = statBuf.st_ino;
+ if (mtime)
+ *mtime = statBuf.st_mtime;
+ if (issetuid)
+ *issetuid = (statBuf.st_mode & (S_ISUID|S_ISGID));
+ return true;
+ }
+ }
+ if ( ::stat(path, &statBuf) != 0 )
+ return false;
+ if (inode)
+ *inode = statBuf.st_ino;
+ if (mtime)
+ *mtime = statBuf.st_mtime;
+ if (issetuid)
+ *issetuid = (statBuf.st_mode & (S_ISUID|S_ISGID));
+ return true;
+}