mirror of
https://github.com/darlinghq/darling-dyld.git
synced 2024-11-26 22:00:26 +00:00
1426 lines
62 KiB
C++
1426 lines
62 KiB
C++
/*
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* Copyright (c) 2017 Apple Inc. All rights reserved.
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*
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* @APPLE_LICENSE_HEADER_START@
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this
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* file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_LICENSE_HEADER_END@
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/errno.h>
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#include <sys/mman.h>
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#include <mach/mach.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <assert.h>
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#include <mach-o/reloc.h>
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#include <mach-o/nlist.h>
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extern "C" {
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#include <corecrypto/ccdigest.h>
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#include <corecrypto/ccsha1.h>
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#include <corecrypto/ccsha2.h>
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}
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#include "MachOFile.h"
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#include "MachOLoaded.h"
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#include "CodeSigningTypes.h"
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namespace dyld3 {
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void MachOLoaded::getLinkEditLoadCommands(Diagnostics& diag, LinkEditInfo& result) const
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{
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result.dyldInfo = nullptr;
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result.exportsTrie = nullptr;
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result.chainedFixups = nullptr;
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result.symTab = nullptr;
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result.dynSymTab = nullptr;
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result.splitSegInfo = nullptr;
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result.functionStarts = nullptr;
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result.dataInCode = nullptr;
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result.codeSig = nullptr;
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__block bool hasUUID = false;
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__block bool hasMinVersion = false;
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__block bool hasEncrypt = false;
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forEachLoadCommand(diag, ^(const load_command* cmd, bool& stop) {
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switch ( cmd->cmd ) {
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case LC_DYLD_INFO:
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case LC_DYLD_INFO_ONLY:
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if ( cmd->cmdsize != sizeof(dyld_info_command) )
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diag.error("LC_DYLD_INFO load command size wrong");
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else if ( result.dyldInfo != nullptr )
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diag.error("multiple LC_DYLD_INFO load commands");
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result.dyldInfo = (dyld_info_command*)cmd;
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break;
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case LC_DYLD_EXPORTS_TRIE:
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if ( cmd->cmdsize != sizeof(linkedit_data_command) )
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diag.error("LC_DYLD_EXPORTS_TRIE load command size wrong");
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else if ( result.exportsTrie != nullptr )
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diag.error("multiple LC_DYLD_EXPORTS_TRIE load commands");
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result.exportsTrie = (linkedit_data_command*)cmd;
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break;
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case LC_DYLD_CHAINED_FIXUPS:
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if ( cmd->cmdsize != sizeof(linkedit_data_command) )
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diag.error("LC_DYLD_CHAINED_FIXUPS load command size wrong");
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else if ( result.chainedFixups != nullptr )
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diag.error("multiple LC_DYLD_CHAINED_FIXUPS load commands");
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result.chainedFixups = (linkedit_data_command*)cmd;
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break;
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case LC_SYMTAB:
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if ( cmd->cmdsize != sizeof(symtab_command) )
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diag.error("LC_SYMTAB load command size wrong");
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else if ( result.symTab != nullptr )
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diag.error("multiple LC_SYMTAB load commands");
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result.symTab = (symtab_command*)cmd;
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break;
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case LC_DYSYMTAB:
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if ( cmd->cmdsize != sizeof(dysymtab_command) )
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diag.error("LC_DYSYMTAB load command size wrong");
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else if ( result.dynSymTab != nullptr )
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diag.error("multiple LC_DYSYMTAB load commands");
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result.dynSymTab = (dysymtab_command*)cmd;
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break;
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case LC_SEGMENT_SPLIT_INFO:
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if ( cmd->cmdsize != sizeof(linkedit_data_command) )
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diag.error("LC_SEGMENT_SPLIT_INFO load command size wrong");
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else if ( result.splitSegInfo != nullptr )
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diag.error("multiple LC_SEGMENT_SPLIT_INFO load commands");
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result.splitSegInfo = (linkedit_data_command*)cmd;
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break;
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case LC_FUNCTION_STARTS:
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if ( cmd->cmdsize != sizeof(linkedit_data_command) )
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diag.error("LC_FUNCTION_STARTS load command size wrong");
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else if ( result.functionStarts != nullptr )
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diag.error("multiple LC_FUNCTION_STARTS load commands");
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result.functionStarts = (linkedit_data_command*)cmd;
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break;
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case LC_DATA_IN_CODE:
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if ( cmd->cmdsize != sizeof(linkedit_data_command) )
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diag.error("LC_DATA_IN_CODE load command size wrong");
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else if ( result.dataInCode != nullptr )
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diag.error("multiple LC_DATA_IN_CODE load commands");
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result.dataInCode = (linkedit_data_command*)cmd;
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break;
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case LC_CODE_SIGNATURE:
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if ( cmd->cmdsize != sizeof(linkedit_data_command) )
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diag.error("LC_CODE_SIGNATURE load command size wrong");
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else if ( result.codeSig != nullptr )
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diag.error("multiple LC_CODE_SIGNATURE load commands");
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result.codeSig = (linkedit_data_command*)cmd;
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break;
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case LC_UUID:
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if ( cmd->cmdsize != sizeof(uuid_command) )
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diag.error("LC_UUID load command size wrong");
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else if ( hasUUID )
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diag.error("multiple LC_UUID load commands");
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hasUUID = true;
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break;
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case LC_VERSION_MIN_IPHONEOS:
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case LC_VERSION_MIN_MACOSX:
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case LC_VERSION_MIN_TVOS:
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case LC_VERSION_MIN_WATCHOS:
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if ( cmd->cmdsize != sizeof(version_min_command) )
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diag.error("LC_VERSION_* load command size wrong");
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else if ( hasMinVersion )
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diag.error("multiple LC_VERSION_MIN_* load commands");
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hasMinVersion = true;
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break;
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case LC_BUILD_VERSION:
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if ( cmd->cmdsize != (sizeof(build_version_command) + ((build_version_command*)cmd)->ntools * sizeof(build_tool_version)) )
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diag.error("LC_BUILD_VERSION load command size wrong");
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break;
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case LC_ENCRYPTION_INFO:
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if ( cmd->cmdsize != sizeof(encryption_info_command) )
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diag.error("LC_ENCRYPTION_INFO load command size wrong");
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else if ( hasEncrypt )
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diag.error("multiple LC_ENCRYPTION_INFO load commands");
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else if ( is64() )
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diag.error("LC_ENCRYPTION_INFO found in 64-bit mach-o");
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hasEncrypt = true;
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break;
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case LC_ENCRYPTION_INFO_64:
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if ( cmd->cmdsize != sizeof(encryption_info_command_64) )
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diag.error("LC_ENCRYPTION_INFO_64 load command size wrong");
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else if ( hasEncrypt )
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diag.error("multiple LC_ENCRYPTION_INFO_64 load commands");
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else if ( !is64() )
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diag.error("LC_ENCRYPTION_INFO_64 found in 32-bit mach-o");
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hasEncrypt = true;
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break;
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}
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});
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if ( diag.noError() && (result.dynSymTab != nullptr) && (result.symTab == nullptr) )
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diag.error("LC_DYSYMTAB but no LC_SYMTAB load command");
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}
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void MachOLoaded::getLinkEditPointers(Diagnostics& diag, LinkEditInfo& result) const
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{
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getLinkEditLoadCommands(diag, result);
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if ( diag.noError() )
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getLayoutInfo(result.layout);
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}
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const uint8_t* MachOLoaded::getExportsTrie(const LinkEditInfo& leInfo, uint64_t& trieSize) const
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{
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if ( leInfo.exportsTrie != nullptr) {
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trieSize = leInfo.exportsTrie->datasize;
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uint64_t offsetInLinkEdit = leInfo.exportsTrie->dataoff - leInfo.layout.linkeditFileOffset;
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return (uint8_t*)this + (leInfo.layout.linkeditUnslidVMAddr - leInfo.layout.textUnslidVMAddr) + offsetInLinkEdit;
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}
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else if ( leInfo.dyldInfo != nullptr ) {
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trieSize = leInfo.dyldInfo->export_size;
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uint64_t offsetInLinkEdit = leInfo.dyldInfo->export_off - leInfo.layout.linkeditFileOffset;
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return (uint8_t*)this + (leInfo.layout.linkeditUnslidVMAddr - leInfo.layout.textUnslidVMAddr) + offsetInLinkEdit;
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}
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trieSize = 0;
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return nullptr;
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}
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void MachOLoaded::getLayoutInfo(LayoutInfo& result) const
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{
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forEachSegment(^(const SegmentInfo& info, bool& stop) {
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if ( strcmp(info.segName, "__TEXT") == 0 ) {
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result.textUnslidVMAddr = (uintptr_t)info.vmAddr;
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result.slide = (uintptr_t)(((uint64_t)this) - info.vmAddr);
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}
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else if ( strcmp(info.segName, "__LINKEDIT") == 0 ) {
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result.linkeditUnslidVMAddr = (uintptr_t)info.vmAddr;
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result.linkeditFileOffset = (uint32_t)info.fileOffset;
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result.linkeditFileSize = (uint32_t)info.fileSize;
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result.linkeditSegIndex = info.segIndex;
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}
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result.lastSegIndex = info.segIndex;
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});
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}
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bool MachOLoaded::hasExportTrie(uint32_t& runtimeOffset, uint32_t& size) const
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{
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runtimeOffset = 0;
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size = 0;
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Diagnostics diag;
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LinkEditInfo leInfo;
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getLinkEditPointers(diag, leInfo);
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diag.assertNoError(); // any malformations in the file should have been caught by earlier validate() call
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if ( diag.hasError() )
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return false;
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uint64_t trieSize;
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if ( const uint8_t* trie = getExportsTrie(leInfo, trieSize) ) {
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runtimeOffset = (uint32_t)(trie - (uint8_t*)this);
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size = (uint32_t)trieSize;
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return true;
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}
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return false;
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}
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#if BUILDING_LIBDYLD
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// this is only used by dlsym() at runtime. All other binding is done when the closure is built.
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bool MachOLoaded::hasExportedSymbol(const char* symbolName, DependentToMachOLoaded finder, void** result,
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bool* resultPointsToInstructions) const
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{
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typedef void* (*ResolverFunc)(void);
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ResolverFunc resolver;
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Diagnostics diag;
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FoundSymbol foundInfo;
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if ( findExportedSymbol(diag, symbolName, false, foundInfo, finder) ) {
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switch ( foundInfo.kind ) {
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case FoundSymbol::Kind::headerOffset: {
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*result = (uint8_t*)foundInfo.foundInDylib + foundInfo.value;
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*resultPointsToInstructions = false;
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int64_t slide = foundInfo.foundInDylib->getSlide();
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foundInfo.foundInDylib->forEachSection(^(const SectionInfo& sectInfo, bool malformedSectionRange, bool& stop) {
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uint64_t sectStartAddr = sectInfo.sectAddr + slide;
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uint64_t sectEndAddr = sectStartAddr + sectInfo.sectSize;
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if ( ((uint64_t)*result >= sectStartAddr) && ((uint64_t)*result < sectEndAddr) ) {
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*resultPointsToInstructions = (sectInfo.sectFlags & S_ATTR_PURE_INSTRUCTIONS) || (sectInfo.sectFlags & S_ATTR_SOME_INSTRUCTIONS);
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stop = true;
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}
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});
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break;
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}
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case FoundSymbol::Kind::absolute:
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*result = (void*)(long)foundInfo.value;
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*resultPointsToInstructions = false;
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break;
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case FoundSymbol::Kind::resolverOffset:
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// foundInfo.value contains "stub".
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// in dlsym() we want to call resolver function to get final function address
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resolver = (ResolverFunc)((uint8_t*)foundInfo.foundInDylib + foundInfo.resolverFuncOffset);
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*result = (*resolver)();
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// FIXME: Set this properly
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*resultPointsToInstructions = true;
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break;
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}
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return true;
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}
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return false;
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}
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#endif // BUILDING_LIBDYLD
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bool MachOLoaded::findExportedSymbol(Diagnostics& diag, const char* symbolName, bool weakImport, FoundSymbol& foundInfo, DependentToMachOLoaded findDependent) const
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{
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LinkEditInfo leInfo;
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getLinkEditPointers(diag, leInfo);
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if ( diag.hasError() )
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return false;
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uint64_t trieSize;
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if ( const uint8_t* trieStart = getExportsTrie(leInfo, trieSize) ) {
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const uint8_t* trieEnd = trieStart + trieSize;
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const uint8_t* node = trieWalk(diag, trieStart, trieEnd, symbolName);
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if ( node == nullptr ) {
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// symbol not exported from this image. Seach any re-exported dylibs
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__block unsigned depIndex = 0;
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__block bool foundInReExportedDylib = false;
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forEachDependentDylib(^(const char* loadPath, bool isWeak, bool isReExport, bool isUpward, uint32_t compatVersion, uint32_t curVersion, bool& stop) {
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if ( isReExport && findDependent ) {
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if ( const MachOLoaded* depMH = findDependent(this, depIndex) ) {
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if ( depMH->findExportedSymbol(diag, symbolName, weakImport, foundInfo, findDependent) ) {
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stop = true;
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foundInReExportedDylib = true;
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}
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}
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}
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++depIndex;
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});
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return foundInReExportedDylib;
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}
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const uint8_t* p = node;
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const uint64_t flags = read_uleb128(diag, p, trieEnd);
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if ( flags & EXPORT_SYMBOL_FLAGS_REEXPORT ) {
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if ( !findDependent )
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return false;
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// re-export from another dylib, lookup there
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const uint64_t ordinal = read_uleb128(diag, p, trieEnd);
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const char* importedName = (char*)p;
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if ( importedName[0] == '\0' )
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importedName = symbolName;
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if ( (ordinal == 0) || (ordinal > dependentDylibCount()) ) {
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diag.error("re-export ordinal %lld out of range for %s", ordinal, symbolName);
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return false;
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}
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uint32_t depIndex = (uint32_t)(ordinal-1);
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if ( const MachOLoaded* depMH = findDependent(this, depIndex) ) {
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return depMH->findExportedSymbol(diag, importedName, weakImport, foundInfo, findDependent);
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}
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else if (weakImport) {
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return false;
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}
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else {
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diag.error("dependent dylib %lld not found for re-exported symbol %s", ordinal, symbolName);
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return false;
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}
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}
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foundInfo.kind = FoundSymbol::Kind::headerOffset;
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foundInfo.isThreadLocal = false;
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foundInfo.isWeakDef = false;
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foundInfo.foundInDylib = this;
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foundInfo.value = read_uleb128(diag, p, trieEnd);
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foundInfo.resolverFuncOffset = 0;
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foundInfo.foundSymbolName = symbolName;
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if ( diag.hasError() )
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return false;
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switch ( flags & EXPORT_SYMBOL_FLAGS_KIND_MASK ) {
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case EXPORT_SYMBOL_FLAGS_KIND_REGULAR:
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if ( flags & EXPORT_SYMBOL_FLAGS_STUB_AND_RESOLVER ) {
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foundInfo.kind = FoundSymbol::Kind::headerOffset;
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foundInfo.resolverFuncOffset = (uint32_t)read_uleb128(diag, p, trieEnd);
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}
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else {
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foundInfo.kind = FoundSymbol::Kind::headerOffset;
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}
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if ( flags & EXPORT_SYMBOL_FLAGS_WEAK_DEFINITION )
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foundInfo.isWeakDef = true;
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break;
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case EXPORT_SYMBOL_FLAGS_KIND_THREAD_LOCAL:
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foundInfo.isThreadLocal = true;
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break;
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case EXPORT_SYMBOL_FLAGS_KIND_ABSOLUTE:
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foundInfo.kind = FoundSymbol::Kind::absolute;
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break;
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default:
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diag.error("unsupported exported symbol kind. flags=%llu at node offset=0x%0lX", flags, (long)(node-trieStart));
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return false;
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}
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return true;
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}
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else {
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// this is an old binary (before macOS 10.6), scan the symbol table
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foundInfo.foundInDylib = nullptr;
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forEachGlobalSymbol(diag, ^(const char* aSymbolName, uint64_t n_value, uint8_t n_type, uint8_t n_sect, uint16_t n_desc, bool& stop) {
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if ( strcmp(aSymbolName, symbolName) == 0 ) {
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foundInfo.kind = FoundSymbol::Kind::headerOffset;
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foundInfo.isThreadLocal = false;
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foundInfo.foundInDylib = this;
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foundInfo.value = n_value - leInfo.layout.textUnslidVMAddr;
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foundInfo.resolverFuncOffset = 0;
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foundInfo.foundSymbolName = symbolName;
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stop = true;
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}
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});
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if ( foundInfo.foundInDylib == nullptr ) {
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// symbol not exported from this image. Search any re-exported dylibs
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__block unsigned depIndex = 0;
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forEachDependentDylib(^(const char* loadPath, bool isWeak, bool isReExport, bool isUpward, uint32_t compatVersion, uint32_t curVersion, bool& stop) {
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if ( isReExport && findDependent ) {
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if ( const MachOLoaded* depMH = findDependent(this, depIndex) ) {
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if ( depMH->findExportedSymbol(diag, symbolName, weakImport, foundInfo, findDependent) ) {
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stop = true;
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}
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}
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}
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++depIndex;
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});
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}
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return (foundInfo.foundInDylib != nullptr);
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}
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}
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intptr_t MachOLoaded::getSlide() const
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{
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Diagnostics diag;
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__block intptr_t slide = 0;
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forEachLoadCommand(diag, ^(const load_command* cmd, bool& stop) {
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if ( cmd->cmd == LC_SEGMENT_64 ) {
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const segment_command_64* seg = (segment_command_64*)cmd;
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if ( strcmp(seg->segname, "__TEXT") == 0 ) {
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slide = (uintptr_t)(((uint64_t)this) - seg->vmaddr);
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stop = true;
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}
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}
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else if ( cmd->cmd == LC_SEGMENT ) {
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const segment_command* seg = (segment_command*)cmd;
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if ( strcmp(seg->segname, "__TEXT") == 0 ) {
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slide = (uintptr_t)(((uint64_t)this) - seg->vmaddr);
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stop = true;
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}
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}
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});
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diag.assertNoError(); // any malformations in the file should have been caught by earlier validate() call
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return slide;
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}
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const uint8_t* MachOLoaded::getLinkEditContent(const LayoutInfo& info, uint32_t fileOffset) const
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{
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uint32_t offsetInLinkedit = fileOffset - info.linkeditFileOffset;
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uintptr_t linkeditStartAddr = info.linkeditUnslidVMAddr + info.slide;
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return (uint8_t*)(linkeditStartAddr + offsetInLinkedit);
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}
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|
void MachOLoaded::forEachGlobalSymbol(Diagnostics& diag, void (^callback)(const char* symbolName, uint64_t n_value, uint8_t n_type, uint8_t n_sect, uint16_t n_desc, bool& stop)) const
|
|
{
|
|
LinkEditInfo leInfo;
|
|
getLinkEditPointers(diag, leInfo);
|
|
if ( diag.hasError() )
|
|
return;
|
|
|
|
const bool is64Bit = is64();
|
|
if ( leInfo.symTab != nullptr ) {
|
|
uint32_t globalsStartIndex = 0;
|
|
uint32_t globalsCount = leInfo.symTab->nsyms;
|
|
if ( leInfo.dynSymTab != nullptr ) {
|
|
globalsStartIndex = leInfo.dynSymTab->iextdefsym;
|
|
globalsCount = leInfo.dynSymTab->nextdefsym;
|
|
}
|
|
uint32_t maxStringOffset = leInfo.symTab->strsize;
|
|
const char* stringPool = (char*)getLinkEditContent(leInfo.layout, leInfo.symTab->stroff);
|
|
const struct nlist* symbols = (struct nlist*) (getLinkEditContent(leInfo.layout, leInfo.symTab->symoff));
|
|
const struct nlist_64* symbols64 = (struct nlist_64*)symbols;
|
|
bool stop = false;
|
|
for (uint32_t i=0; (i < globalsCount) && !stop; ++i) {
|
|
if ( is64Bit ) {
|
|
const struct nlist_64& sym = symbols64[globalsStartIndex+i];
|
|
if ( sym.n_un.n_strx > maxStringOffset )
|
|
continue;
|
|
if ( (sym.n_type & N_EXT) && ((sym.n_type & N_TYPE) == N_SECT) && ((sym.n_type & N_STAB) == 0) )
|
|
callback(&stringPool[sym.n_un.n_strx], sym.n_value, sym.n_type, sym.n_sect, sym.n_desc, stop);
|
|
}
|
|
else {
|
|
const struct nlist& sym = symbols[globalsStartIndex+i];
|
|
if ( sym.n_un.n_strx > maxStringOffset )
|
|
continue;
|
|
if ( (sym.n_type & N_EXT) && ((sym.n_type & N_TYPE) == N_SECT) && ((sym.n_type & N_STAB) == 0) )
|
|
callback(&stringPool[sym.n_un.n_strx], sym.n_value, sym.n_type, sym.n_sect, sym.n_desc, stop);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void MachOLoaded::forEachLocalSymbol(Diagnostics& diag, void (^callback)(const char* symbolName, uint64_t n_value, uint8_t n_type, uint8_t n_sect, uint16_t n_desc, bool& stop)) const
|
|
{
|
|
LinkEditInfo leInfo;
|
|
getLinkEditPointers(diag, leInfo);
|
|
if ( diag.hasError() )
|
|
return;
|
|
|
|
const bool is64Bit = is64();
|
|
if ( leInfo.symTab != nullptr ) {
|
|
uint32_t localsStartIndex = 0;
|
|
uint32_t localsCount = leInfo.symTab->nsyms;
|
|
if ( leInfo.dynSymTab != nullptr ) {
|
|
localsStartIndex = leInfo.dynSymTab->ilocalsym;
|
|
localsCount = leInfo.dynSymTab->nlocalsym;
|
|
}
|
|
uint32_t maxStringOffset = leInfo.symTab->strsize;
|
|
const char* stringPool = (char*)getLinkEditContent(leInfo.layout, leInfo.symTab->stroff);
|
|
const struct nlist* symbols = (struct nlist*) (getLinkEditContent(leInfo.layout, leInfo.symTab->symoff));
|
|
const struct nlist_64* symbols64 = (struct nlist_64*)(getLinkEditContent(leInfo.layout, leInfo.symTab->symoff));
|
|
bool stop = false;
|
|
for (uint32_t i=0; (i < localsCount) && !stop; ++i) {
|
|
if ( is64Bit ) {
|
|
const struct nlist_64& sym = symbols64[localsStartIndex+i];
|
|
if ( sym.n_un.n_strx > maxStringOffset )
|
|
continue;
|
|
if ( ((sym.n_type & N_EXT) == 0) && ((sym.n_type & N_TYPE) == N_SECT) && ((sym.n_type & N_STAB) == 0) )
|
|
callback(&stringPool[sym.n_un.n_strx], sym.n_value, sym.n_type, sym.n_sect, sym.n_desc, stop);
|
|
}
|
|
else {
|
|
const struct nlist& sym = symbols[localsStartIndex+i];
|
|
if ( sym.n_un.n_strx > maxStringOffset )
|
|
continue;
|
|
if ( ((sym.n_type & N_EXT) == 0) && ((sym.n_type & N_TYPE) == N_SECT) && ((sym.n_type & N_STAB) == 0) )
|
|
callback(&stringPool[sym.n_un.n_strx], sym.n_value, sym.n_type, sym.n_sect, sym.n_desc, stop);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
uint32_t MachOLoaded::dependentDylibCount() const
|
|
{
|
|
__block uint32_t count = 0;
|
|
forEachDependentDylib(^(const char* loadPath, bool isWeak, bool isReExport, bool isUpward, uint32_t compatVersion, uint32_t curVersion, bool& stop) {
|
|
++count;
|
|
});
|
|
return count;
|
|
}
|
|
|
|
const char* MachOLoaded::dependentDylibLoadPath(uint32_t depIndex) const
|
|
{
|
|
__block const char* foundLoadPath = nullptr;
|
|
__block uint32_t curDepIndex = 0;
|
|
forEachDependentDylib(^(const char* loadPath, bool isWeak, bool isReExport, bool isUpward, uint32_t compatVersion, uint32_t curVersion, bool& stop) {
|
|
if ( curDepIndex == depIndex ) {
|
|
foundLoadPath = loadPath;
|
|
stop = true;
|
|
}
|
|
++curDepIndex;
|
|
});
|
|
return foundLoadPath;
|
|
}
|
|
|
|
const char* MachOLoaded::segmentName(uint32_t targetSegIndex) const
|
|
{
|
|
__block const char* result = nullptr;
|
|
forEachSegment(^(const SegmentInfo& info, bool& stop) {
|
|
if ( targetSegIndex == info.segIndex ) {
|
|
result = info.segName;
|
|
stop = true;
|
|
}
|
|
});
|
|
return result;
|
|
}
|
|
|
|
bool MachOLoaded::findClosestFunctionStart(uint64_t address, uint64_t* functionStartAddress) const
|
|
{
|
|
Diagnostics diag;
|
|
LinkEditInfo leInfo;
|
|
getLinkEditPointers(diag, leInfo);
|
|
if ( diag.hasError() )
|
|
return false;
|
|
if ( leInfo.functionStarts == nullptr )
|
|
return false;
|
|
|
|
const uint8_t* starts = getLinkEditContent(leInfo.layout, leInfo.functionStarts->dataoff);
|
|
const uint8_t* startsEnd = starts + leInfo.functionStarts->datasize;
|
|
|
|
uint64_t lastAddr = (uint64_t)(long)this;
|
|
uint64_t runningAddr = lastAddr;
|
|
while (diag.noError()) {
|
|
uint64_t value = read_uleb128(diag, starts, startsEnd);
|
|
if ( value == 0 )
|
|
break;
|
|
lastAddr = runningAddr;
|
|
runningAddr += value;
|
|
//fprintf(stderr, " addr=0x%08llX\n", runningAddr);
|
|
if ( runningAddr > address ) {
|
|
*functionStartAddress = lastAddr;
|
|
return true;
|
|
}
|
|
};
|
|
|
|
return false;
|
|
}
|
|
|
|
bool MachOLoaded::findClosestSymbol(uint64_t address, const char** symbolName, uint64_t* symbolAddr) const
|
|
{
|
|
Diagnostics diag;
|
|
LinkEditInfo leInfo;
|
|
getLinkEditPointers(diag, leInfo);
|
|
if ( diag.hasError() )
|
|
return false;
|
|
if ( (leInfo.symTab == nullptr) || (leInfo.dynSymTab == nullptr) )
|
|
return false;
|
|
uint64_t targetUnslidAddress = address - leInfo.layout.slide;
|
|
|
|
// find section index the address is in to validate n_sect
|
|
__block uint32_t sectionIndexForTargetAddress = 0;
|
|
forEachSection(^(const SectionInfo& sectInfo, bool malformedSectionRange, bool& stop) {
|
|
++sectionIndexForTargetAddress;
|
|
if ( (sectInfo.sectAddr <= targetUnslidAddress) && (targetUnslidAddress < sectInfo.sectAddr+sectInfo.sectSize) ) {
|
|
stop = true;
|
|
}
|
|
});
|
|
|
|
uint32_t maxStringOffset = leInfo.symTab->strsize;
|
|
const char* stringPool = (char*)getLinkEditContent(leInfo.layout, leInfo.symTab->stroff);
|
|
const struct nlist* symbols = (struct nlist*) (getLinkEditContent(leInfo.layout, leInfo.symTab->symoff));
|
|
if ( is64() ) {
|
|
const struct nlist_64* symbols64 = (struct nlist_64*)symbols;
|
|
const struct nlist_64* bestSymbol = nullptr;
|
|
// first walk all global symbols
|
|
const struct nlist_64* const globalsStart = &symbols64[leInfo.dynSymTab->iextdefsym];
|
|
const struct nlist_64* const globalsEnd = &globalsStart[leInfo.dynSymTab->nextdefsym];
|
|
for (const struct nlist_64* s = globalsStart; s < globalsEnd; ++s) {
|
|
if ( (s->n_type & N_TYPE) == N_SECT ) {
|
|
if ( bestSymbol == nullptr ) {
|
|
if ( (s->n_value <= targetUnslidAddress) && (s->n_sect == sectionIndexForTargetAddress) )
|
|
bestSymbol = s;
|
|
}
|
|
else if ( (s->n_value <= targetUnslidAddress) && (bestSymbol->n_value < s->n_value) && (s->n_sect == sectionIndexForTargetAddress) ) {
|
|
bestSymbol = s;
|
|
}
|
|
}
|
|
}
|
|
// next walk all local symbols
|
|
const struct nlist_64* const localsStart = &symbols64[leInfo.dynSymTab->ilocalsym];
|
|
const struct nlist_64* const localsEnd = &localsStart[leInfo.dynSymTab->nlocalsym];
|
|
for (const struct nlist_64* s = localsStart; s < localsEnd; ++s) {
|
|
if ( ((s->n_type & N_TYPE) == N_SECT) && ((s->n_type & N_STAB) == 0) ) {
|
|
if ( bestSymbol == nullptr ) {
|
|
if ( (s->n_value <= targetUnslidAddress) && (s->n_sect == sectionIndexForTargetAddress) )
|
|
bestSymbol = s;
|
|
}
|
|
else if ( (s->n_value <= targetUnslidAddress) && (bestSymbol->n_value < s->n_value) && (s->n_sect == sectionIndexForTargetAddress) ) {
|
|
bestSymbol = s;
|
|
}
|
|
}
|
|
}
|
|
if ( bestSymbol != NULL ) {
|
|
*symbolAddr = bestSymbol->n_value + leInfo.layout.slide;
|
|
if ( bestSymbol->n_un.n_strx < maxStringOffset )
|
|
*symbolName = &stringPool[bestSymbol->n_un.n_strx];
|
|
return true;
|
|
}
|
|
}
|
|
else {
|
|
const struct nlist* bestSymbol = nullptr;
|
|
// first walk all global symbols
|
|
const struct nlist* const globalsStart = &symbols[leInfo.dynSymTab->iextdefsym];
|
|
const struct nlist* const globalsEnd = &globalsStart[leInfo.dynSymTab->nextdefsym];
|
|
for (const struct nlist* s = globalsStart; s < globalsEnd; ++s) {
|
|
if ( (s->n_type & N_TYPE) == N_SECT ) {
|
|
if ( bestSymbol == nullptr ) {
|
|
if ( (s->n_value <= targetUnslidAddress) && (s->n_sect == sectionIndexForTargetAddress) )
|
|
bestSymbol = s;
|
|
}
|
|
else if ( (s->n_value <= targetUnslidAddress) && (bestSymbol->n_value < s->n_value) && (s->n_sect == sectionIndexForTargetAddress) ) {
|
|
bestSymbol = s;
|
|
}
|
|
}
|
|
}
|
|
// next walk all local symbols
|
|
const struct nlist* const localsStart = &symbols[leInfo.dynSymTab->ilocalsym];
|
|
const struct nlist* const localsEnd = &localsStart[leInfo.dynSymTab->nlocalsym];
|
|
for (const struct nlist* s = localsStart; s < localsEnd; ++s) {
|
|
if ( ((s->n_type & N_TYPE) == N_SECT) && ((s->n_type & N_STAB) == 0) ) {
|
|
if ( bestSymbol == nullptr ) {
|
|
if ( (s->n_value <= targetUnslidAddress) && (s->n_sect == sectionIndexForTargetAddress) )
|
|
bestSymbol = s;
|
|
}
|
|
else if ( (s->n_value <= targetUnslidAddress) && (bestSymbol->n_value < s->n_value) && (s->n_sect == sectionIndexForTargetAddress) ) {
|
|
bestSymbol = s;
|
|
}
|
|
}
|
|
}
|
|
if ( bestSymbol != nullptr ) {
|
|
#if __arm__
|
|
if ( bestSymbol->n_desc & N_ARM_THUMB_DEF )
|
|
*symbolAddr = (bestSymbol->n_value | 1) + leInfo.layout.slide;
|
|
else
|
|
*symbolAddr = bestSymbol->n_value + leInfo.layout.slide;
|
|
#else
|
|
*symbolAddr = bestSymbol->n_value + leInfo.layout.slide;
|
|
#endif
|
|
if ( bestSymbol->n_un.n_strx < maxStringOffset )
|
|
*symbolName = &stringPool[bestSymbol->n_un.n_strx];
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
const void* MachOLoaded::findSectionContent(const char* segName, const char* sectName, uint64_t& size) const
|
|
{
|
|
__block const void* result = nullptr;
|
|
forEachSection(^(const SectionInfo& sectInfo, bool malformedSectionRange, bool& stop) {
|
|
if ( (strcmp(sectInfo.sectName, sectName) == 0) && (strcmp(sectInfo.segInfo.segName, segName) == 0) ) {
|
|
size = sectInfo.sectSize;
|
|
result = (void*)(sectInfo.sectAddr + getSlide());
|
|
}
|
|
});
|
|
return result;
|
|
}
|
|
|
|
|
|
bool MachOLoaded::intersectsRange(uintptr_t start, uintptr_t length) const
|
|
{
|
|
__block bool result = false;
|
|
uintptr_t slide = getSlide();
|
|
forEachSegment(^(const SegmentInfo& info, bool& stop) {
|
|
if ( (info.vmAddr+info.vmSize+slide >= start) && (info.vmAddr+slide < start+length) )
|
|
result = true;
|
|
});
|
|
return result;
|
|
}
|
|
|
|
const uint8_t* MachOLoaded::trieWalk(Diagnostics& diag, const uint8_t* start, const uint8_t* end, const char* symbol)
|
|
{
|
|
STACK_ALLOC_OVERFLOW_SAFE_ARRAY(uint32_t, visitedNodeOffsets, 128);
|
|
visitedNodeOffsets.push_back(0);
|
|
const uint8_t* p = start;
|
|
while ( p < end ) {
|
|
uint64_t terminalSize = *p++;
|
|
if ( terminalSize > 127 ) {
|
|
// except for re-export-with-rename, all terminal sizes fit in one byte
|
|
--p;
|
|
terminalSize = read_uleb128(diag, p, end);
|
|
if ( diag.hasError() )
|
|
return nullptr;
|
|
}
|
|
if ( (*symbol == '\0') && (terminalSize != 0) ) {
|
|
return p;
|
|
}
|
|
const uint8_t* children = p + terminalSize;
|
|
if ( children > end ) {
|
|
//diag.error("malformed trie node, terminalSize=0x%llX extends past end of trie\n", terminalSize);
|
|
return nullptr;
|
|
}
|
|
uint8_t childrenRemaining = *children++;
|
|
p = children;
|
|
uint64_t nodeOffset = 0;
|
|
for (; childrenRemaining > 0; --childrenRemaining) {
|
|
const char* ss = symbol;
|
|
bool wrongEdge = false;
|
|
// scan whole edge to get to next edge
|
|
// if edge is longer than target symbol name, don't read past end of symbol name
|
|
char c = *p;
|
|
while ( c != '\0' ) {
|
|
if ( !wrongEdge ) {
|
|
if ( c != *ss )
|
|
wrongEdge = true;
|
|
++ss;
|
|
}
|
|
++p;
|
|
c = *p;
|
|
}
|
|
if ( wrongEdge ) {
|
|
// advance to next child
|
|
++p; // skip over zero terminator
|
|
// skip over uleb128 until last byte is found
|
|
while ( (*p & 0x80) != 0 )
|
|
++p;
|
|
++p; // skip over last byte of uleb128
|
|
if ( p > end ) {
|
|
diag.error("malformed trie node, child node extends past end of trie\n");
|
|
return nullptr;
|
|
}
|
|
}
|
|
else {
|
|
// the symbol so far matches this edge (child)
|
|
// so advance to the child's node
|
|
++p;
|
|
nodeOffset = read_uleb128(diag, p, end);
|
|
if ( diag.hasError() )
|
|
return nullptr;
|
|
if ( (nodeOffset == 0) || ( &start[nodeOffset] > end) ) {
|
|
diag.error("malformed trie child, nodeOffset=0x%llX out of range\n", nodeOffset);
|
|
return nullptr;
|
|
}
|
|
symbol = ss;
|
|
break;
|
|
}
|
|
}
|
|
if ( nodeOffset != 0 ) {
|
|
if ( nodeOffset > (uint64_t)(end-start) ) {
|
|
diag.error("malformed trie child, nodeOffset=0x%llX out of range\n", nodeOffset);
|
|
return nullptr;
|
|
}
|
|
// check for cycles
|
|
for (uint32_t aVisitedNodeOffset : visitedNodeOffsets) {
|
|
if ( aVisitedNodeOffset == nodeOffset ) {
|
|
diag.error("malformed trie child, cycle to nodeOffset=0x%llX\n", nodeOffset);
|
|
return nullptr;
|
|
}
|
|
}
|
|
visitedNodeOffsets.push_back((uint32_t)nodeOffset);
|
|
p = &start[nodeOffset];
|
|
}
|
|
else
|
|
p = end;
|
|
}
|
|
return nullptr;
|
|
}
|
|
|
|
void MachOLoaded::forEachCDHashOfCodeSignature(const void* codeSigStart, size_t codeSignLen,
|
|
void (^callback)(const uint8_t cdHash[20])) const
|
|
{
|
|
#ifndef DARLING
|
|
forEachCodeDirectoryBlob(codeSigStart, codeSignLen, ^(const void *cdBuffer) {
|
|
const CS_CodeDirectory* cd = (const CS_CodeDirectory*)cdBuffer;
|
|
uint32_t cdLength = htonl(cd->length);
|
|
uint8_t cdHash[20];
|
|
if ( cd->hashType == CS_HASHTYPE_SHA384 ) {
|
|
uint8_t digest[CCSHA384_OUTPUT_SIZE];
|
|
const struct ccdigest_info* di = ccsha384_di();
|
|
ccdigest_di_decl(di, tempBuf); // declares tempBuf array in stack
|
|
ccdigest_init(di, tempBuf);
|
|
ccdigest_update(di, tempBuf, cdLength, cd);
|
|
ccdigest_final(di, tempBuf, digest);
|
|
ccdigest_di_clear(di, tempBuf);
|
|
// cd-hash of sigs that use SHA384 is the first 20 bytes of the SHA384 of the code digest
|
|
memcpy(cdHash, digest, 20);
|
|
callback(cdHash);
|
|
return;
|
|
}
|
|
else if ( (cd->hashType == CS_HASHTYPE_SHA256) || (cd->hashType == CS_HASHTYPE_SHA256_TRUNCATED) ) {
|
|
uint8_t digest[CCSHA256_OUTPUT_SIZE];
|
|
const struct ccdigest_info* di = ccsha256_di();
|
|
ccdigest_di_decl(di, tempBuf); // declares tempBuf array in stack
|
|
ccdigest_init(di, tempBuf);
|
|
ccdigest_update(di, tempBuf, cdLength, cd);
|
|
ccdigest_final(di, tempBuf, digest);
|
|
ccdigest_di_clear(di, tempBuf);
|
|
// cd-hash of sigs that use SHA256 is the first 20 bytes of the SHA256 of the code digest
|
|
memcpy(cdHash, digest, 20);
|
|
callback(cdHash);
|
|
return;
|
|
}
|
|
else if ( cd->hashType == CS_HASHTYPE_SHA1 ) {
|
|
// compute hash directly into return buffer
|
|
const struct ccdigest_info* di = ccsha1_di();
|
|
ccdigest_di_decl(di, tempBuf); // declares tempBuf array in stack
|
|
ccdigest_init(di, tempBuf);
|
|
ccdigest_update(di, tempBuf, cdLength, cd);
|
|
ccdigest_final(di, tempBuf, cdHash);
|
|
ccdigest_di_clear(di, tempBuf);
|
|
callback(cdHash);
|
|
return;
|
|
}
|
|
});
|
|
#endif
|
|
}
|
|
|
|
|
|
// Note, this has to match the kernel
|
|
static const uint32_t hashPriorities[] = {
|
|
CS_HASHTYPE_SHA1,
|
|
CS_HASHTYPE_SHA256_TRUNCATED,
|
|
CS_HASHTYPE_SHA256,
|
|
CS_HASHTYPE_SHA384,
|
|
};
|
|
|
|
static unsigned int hash_rank(const CS_CodeDirectory *cd)
|
|
{
|
|
uint32_t type = cd->hashType;
|
|
for (uint32_t n = 0; n < sizeof(hashPriorities) / sizeof(hashPriorities[0]); ++n) {
|
|
if (hashPriorities[n] == type)
|
|
return n + 1;
|
|
}
|
|
|
|
/* not supported */
|
|
return 0;
|
|
}
|
|
|
|
// Note, this does NOT match the kernel.
|
|
// On watchOS, in main executables, we will record all cd hashes then make sure
|
|
// one of the ones we record matches the kernel.
|
|
// This list is only for dylibs where we embed the cd hash in the closure instead of the
|
|
// mod time and inode
|
|
// This is sorted so that we choose sha1 first when checking dylibs
|
|
static const uint32_t hashPriorities_watchOS_dylibs[] = {
|
|
CS_HASHTYPE_SHA256_TRUNCATED,
|
|
CS_HASHTYPE_SHA256,
|
|
CS_HASHTYPE_SHA384,
|
|
CS_HASHTYPE_SHA1
|
|
};
|
|
|
|
static unsigned int hash_rank_watchOS_dylibs(const CS_CodeDirectory *cd)
|
|
{
|
|
uint32_t type = cd->hashType;
|
|
for (uint32_t n = 0; n < sizeof(hashPriorities_watchOS_dylibs) / sizeof(hashPriorities_watchOS_dylibs[0]); ++n) {
|
|
if (hashPriorities_watchOS_dylibs[n] == type)
|
|
return n + 1;
|
|
}
|
|
|
|
/* not supported */
|
|
return 0;
|
|
}
|
|
|
|
// This calls the callback for all code directories required for a given platform/binary combination.
|
|
// On watchOS main executables this is all cd hashes.
|
|
// On watchOS dylibs this is only the single cd hash we need (by rank defined by dyld, not the kernel).
|
|
// On all other platforms this always returns a single best cd hash (ranked to match the kernel).
|
|
// Note the callback parameter is really a CS_CodeDirectory.
|
|
void MachOLoaded::forEachCodeDirectoryBlob(const void* codeSigStart, size_t codeSignLen,
|
|
void (^callback)(const void* cd)) const
|
|
{
|
|
// verify min length of overall code signature
|
|
if ( codeSignLen < sizeof(CS_SuperBlob) )
|
|
return;
|
|
|
|
// verify magic at start
|
|
const CS_SuperBlob* codeSuperBlob = (CS_SuperBlob*)codeSigStart;
|
|
if ( codeSuperBlob->magic != htonl(CSMAGIC_EMBEDDED_SIGNATURE) )
|
|
return;
|
|
|
|
// verify count of sub-blobs not too large
|
|
uint32_t subBlobCount = htonl(codeSuperBlob->count);
|
|
if ( (codeSignLen-sizeof(CS_SuperBlob))/sizeof(CS_BlobIndex) < subBlobCount )
|
|
return;
|
|
|
|
// Note: The kernel sometimes chooses sha1 on watchOS, and sometimes sha256.
|
|
// Embed all of them so that we just need to match any of them
|
|
const bool isWatchOS = this->builtForPlatform(Platform::watchOS);
|
|
const bool isMainExecutable = this->isMainExecutable();
|
|
auto hashRankFn = isWatchOS ? &hash_rank_watchOS_dylibs : &hash_rank;
|
|
|
|
// walk each sub blob, looking at ones with type CSSLOT_CODEDIRECTORY
|
|
const CS_CodeDirectory* bestCd = nullptr;
|
|
for (uint32_t i=0; i < subBlobCount; ++i) {
|
|
if ( codeSuperBlob->index[i].type == htonl(CSSLOT_CODEDIRECTORY) ) {
|
|
// Ok, this is the regular code directory
|
|
} else if ( codeSuperBlob->index[i].type >= htonl(CSSLOT_ALTERNATE_CODEDIRECTORIES) && codeSuperBlob->index[i].type <= htonl(CSSLOT_ALTERNATE_CODEDIRECTORY_LIMIT)) {
|
|
// Ok, this is the alternative code directory
|
|
} else {
|
|
continue;
|
|
}
|
|
uint32_t cdOffset = htonl(codeSuperBlob->index[i].offset);
|
|
// verify offset is not out of range
|
|
if ( cdOffset > (codeSignLen - sizeof(CS_CodeDirectory)) )
|
|
continue;
|
|
const CS_CodeDirectory* cd = (CS_CodeDirectory*)((uint8_t*)codeSuperBlob + cdOffset);
|
|
uint32_t cdLength = htonl(cd->length);
|
|
// verify code directory length not out of range
|
|
if ( cdLength > (codeSignLen - cdOffset) )
|
|
continue;
|
|
|
|
// The watch main executable wants to know about all cd hashes
|
|
if ( isWatchOS && isMainExecutable ) {
|
|
callback(cd);
|
|
continue;
|
|
}
|
|
|
|
if ( cd->magic == htonl(CSMAGIC_CODEDIRECTORY) ) {
|
|
if ( !bestCd || (hashRankFn(cd) > hashRankFn(bestCd)) )
|
|
bestCd = cd;
|
|
}
|
|
}
|
|
|
|
// Note this callback won't happen on watchOS as that one was done in the loop
|
|
if ( bestCd != nullptr )
|
|
callback(bestCd);
|
|
}
|
|
|
|
|
|
uint64_t MachOLoaded::ChainedFixupPointerOnDisk::Arm64e::unpackTarget() const
|
|
{
|
|
assert(this->authBind.bind == 0);
|
|
assert(this->authBind.auth == 0);
|
|
return ((uint64_t)(this->rebase.high8) << 56) | (this->rebase.target);
|
|
}
|
|
|
|
uint64_t MachOLoaded::ChainedFixupPointerOnDisk::Arm64e::signExtendedAddend() const
|
|
{
|
|
assert(this->authBind.bind == 1);
|
|
assert(this->authBind.auth == 0);
|
|
uint64_t addend19 = this->bind.addend;
|
|
if ( addend19 & 0x40000 )
|
|
return addend19 | 0xFFFFFFFFFFFC0000ULL;
|
|
else
|
|
return addend19;
|
|
}
|
|
|
|
const char* MachOLoaded::ChainedFixupPointerOnDisk::Arm64e::keyName(uint8_t keyBits)
|
|
{
|
|
static const char* names[] = {
|
|
"IA", "IB", "DA", "DB"
|
|
};
|
|
assert(keyBits < 4);
|
|
return names[keyBits];
|
|
}
|
|
const char* MachOLoaded::ChainedFixupPointerOnDisk::Arm64e::keyName() const
|
|
{
|
|
assert(this->authBind.auth == 1);
|
|
return keyName(this->authBind.key);
|
|
}
|
|
|
|
uint64_t MachOLoaded::ChainedFixupPointerOnDisk::Arm64e::signPointer(uint64_t unsignedAddr, void* loc, bool addrDiv, uint16_t diversity, uint8_t key)
|
|
{
|
|
// don't sign NULL
|
|
if ( unsignedAddr == 0 )
|
|
return 0;
|
|
|
|
#if __has_feature(ptrauth_calls)
|
|
uint64_t extendedDiscriminator = diversity;
|
|
if ( addrDiv )
|
|
extendedDiscriminator = __builtin_ptrauth_blend_discriminator(loc, extendedDiscriminator);
|
|
switch ( key ) {
|
|
case 0: // IA
|
|
return (uintptr_t)__builtin_ptrauth_sign_unauthenticated((void*)unsignedAddr, 0, extendedDiscriminator);
|
|
case 1: // IB
|
|
return (uintptr_t)__builtin_ptrauth_sign_unauthenticated((void*)unsignedAddr, 1, extendedDiscriminator);
|
|
case 2: // DA
|
|
return (uintptr_t)__builtin_ptrauth_sign_unauthenticated((void*)unsignedAddr, 2, extendedDiscriminator);
|
|
case 3: // DB
|
|
return (uintptr_t)__builtin_ptrauth_sign_unauthenticated((void*)unsignedAddr, 3, extendedDiscriminator);
|
|
}
|
|
assert(0 && "invalid signing key");
|
|
#else
|
|
assert(0 && "arm64e signing only arm64e");
|
|
#endif
|
|
}
|
|
|
|
|
|
uint64_t MachOLoaded::ChainedFixupPointerOnDisk::Arm64e::signPointer(void* loc, uint64_t target) const
|
|
{
|
|
assert(this->authBind.auth == 1);
|
|
return signPointer(target, loc, authBind.addrDiv, authBind.diversity, authBind.key);
|
|
}
|
|
|
|
uint64_t MachOLoaded::ChainedFixupPointerOnDisk::Generic64::unpackedTarget() const
|
|
{
|
|
return (((uint64_t)this->rebase.high8) << 56) | (uint64_t)(this->rebase.target);
|
|
}
|
|
|
|
uint64_t MachOLoaded::ChainedFixupPointerOnDisk::Generic64::signExtendedAddend() const
|
|
{
|
|
uint64_t addend27 = this->bind.addend;
|
|
uint64_t top8Bits = addend27 & 0x00007F80000ULL;
|
|
uint64_t bottom19Bits = addend27 & 0x0000007FFFFULL;
|
|
uint64_t newValue = (top8Bits << 13) | (((uint64_t)(bottom19Bits << 37) >> 37) & 0x00FFFFFFFFFFFFFF);
|
|
return newValue;
|
|
}
|
|
|
|
const char* MachOLoaded::ChainedFixupPointerOnDisk::Kernel64::keyName() const
|
|
{
|
|
static const char* names[] = {
|
|
"IA", "IB", "DA", "DB"
|
|
};
|
|
assert(this->isAuth == 1);
|
|
uint8_t keyBits = this->key;
|
|
assert(keyBits < 4);
|
|
return names[keyBits];
|
|
}
|
|
|
|
bool MachOLoaded::ChainedFixupPointerOnDisk::isRebase(uint16_t pointerFormat, uint64_t preferedLoadAddress, uint64_t& targetRuntimeOffset) const
|
|
{
|
|
switch (pointerFormat) {
|
|
case DYLD_CHAINED_PTR_ARM64E:
|
|
case DYLD_CHAINED_PTR_ARM64E_USERLAND:
|
|
case DYLD_CHAINED_PTR_ARM64E_USERLAND24:
|
|
case DYLD_CHAINED_PTR_ARM64E_KERNEL:
|
|
case DYLD_CHAINED_PTR_ARM64E_FIRMWARE:
|
|
if ( this->arm64e.bind.bind )
|
|
return false;
|
|
if ( this->arm64e.authRebase.auth ) {
|
|
targetRuntimeOffset = this->arm64e.authRebase.target;
|
|
return true;
|
|
}
|
|
else {
|
|
targetRuntimeOffset = this->arm64e.unpackTarget();
|
|
if ( (pointerFormat == DYLD_CHAINED_PTR_ARM64E) || (pointerFormat == DYLD_CHAINED_PTR_ARM64E_FIRMWARE) ) {
|
|
targetRuntimeOffset -= preferedLoadAddress;
|
|
}
|
|
return true;
|
|
}
|
|
break;
|
|
case DYLD_CHAINED_PTR_64:
|
|
case DYLD_CHAINED_PTR_64_OFFSET:
|
|
if ( this->generic64.bind.bind )
|
|
return false;
|
|
targetRuntimeOffset = this->generic64.unpackedTarget();
|
|
if ( pointerFormat == DYLD_CHAINED_PTR_64 )
|
|
targetRuntimeOffset -= preferedLoadAddress;
|
|
return true;
|
|
break;
|
|
case DYLD_CHAINED_PTR_64_KERNEL_CACHE:
|
|
case DYLD_CHAINED_PTR_X86_64_KERNEL_CACHE:
|
|
targetRuntimeOffset = this->kernel64.target;
|
|
return true;
|
|
break;
|
|
case DYLD_CHAINED_PTR_32:
|
|
if ( this->generic32.bind.bind )
|
|
return false;
|
|
targetRuntimeOffset = this->generic32.rebase.target - preferedLoadAddress;
|
|
return true;
|
|
break;
|
|
case DYLD_CHAINED_PTR_32_FIRMWARE:
|
|
targetRuntimeOffset = this->firmware32.target - preferedLoadAddress;
|
|
return true;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
assert(0 && "unsupported pointer chain format");
|
|
}
|
|
|
|
bool MachOLoaded::ChainedFixupPointerOnDisk::isBind(uint16_t pointerFormat, uint32_t& bindOrdinal, int64_t& addend) const
|
|
{
|
|
addend = 0;
|
|
switch (pointerFormat) {
|
|
case DYLD_CHAINED_PTR_ARM64E:
|
|
case DYLD_CHAINED_PTR_ARM64E_USERLAND:
|
|
case DYLD_CHAINED_PTR_ARM64E_USERLAND24:
|
|
case DYLD_CHAINED_PTR_ARM64E_KERNEL:
|
|
case DYLD_CHAINED_PTR_ARM64E_FIRMWARE:
|
|
if ( !this->arm64e.authBind.bind )
|
|
return false;
|
|
if ( this->arm64e.authBind.auth ) {
|
|
if ( pointerFormat == DYLD_CHAINED_PTR_ARM64E_USERLAND24 )
|
|
bindOrdinal = this->arm64e.authBind24.ordinal;
|
|
else
|
|
bindOrdinal = this->arm64e.authBind.ordinal;
|
|
return true;
|
|
}
|
|
else {
|
|
if ( pointerFormat == DYLD_CHAINED_PTR_ARM64E_USERLAND24 )
|
|
bindOrdinal = this->arm64e.bind24.ordinal;
|
|
else
|
|
bindOrdinal = this->arm64e.bind.ordinal;
|
|
addend = this->arm64e.signExtendedAddend();
|
|
return true;
|
|
}
|
|
break;
|
|
case DYLD_CHAINED_PTR_64:
|
|
case DYLD_CHAINED_PTR_64_OFFSET:
|
|
if ( !this->generic64.bind.bind )
|
|
return false;
|
|
bindOrdinal = this->generic64.bind.ordinal;
|
|
addend = this->generic64.bind.addend;
|
|
return true;
|
|
break;
|
|
case DYLD_CHAINED_PTR_32:
|
|
if ( !this->generic32.bind.bind )
|
|
return false;
|
|
bindOrdinal = this->generic32.bind.ordinal;
|
|
addend = this->generic32.bind.addend;
|
|
return true;
|
|
break;
|
|
case DYLD_CHAINED_PTR_64_KERNEL_CACHE:
|
|
case DYLD_CHAINED_PTR_X86_64_KERNEL_CACHE:
|
|
return false;
|
|
default:
|
|
break;
|
|
}
|
|
assert(0 && "unsupported pointer chain format");
|
|
}
|
|
|
|
unsigned MachOLoaded::ChainedFixupPointerOnDisk::strideSize(uint16_t pointerFormat)
|
|
{
|
|
switch (pointerFormat) {
|
|
case DYLD_CHAINED_PTR_ARM64E:
|
|
case DYLD_CHAINED_PTR_ARM64E_USERLAND:
|
|
case DYLD_CHAINED_PTR_ARM64E_USERLAND24:
|
|
return 8;
|
|
case DYLD_CHAINED_PTR_ARM64E_KERNEL:
|
|
case DYLD_CHAINED_PTR_ARM64E_FIRMWARE:
|
|
case DYLD_CHAINED_PTR_32_FIRMWARE:
|
|
case DYLD_CHAINED_PTR_64:
|
|
case DYLD_CHAINED_PTR_64_OFFSET:
|
|
case DYLD_CHAINED_PTR_32:
|
|
case DYLD_CHAINED_PTR_32_CACHE:
|
|
case DYLD_CHAINED_PTR_64_KERNEL_CACHE:
|
|
return 4;
|
|
case DYLD_CHAINED_PTR_X86_64_KERNEL_CACHE:
|
|
return 1;
|
|
}
|
|
assert(0 && "unsupported pointer chain format");
|
|
}
|
|
|
|
#if BUILDING_DYLD || BUILDING_LIBDYLD
|
|
void MachOLoaded::fixupAllChainedFixups(Diagnostics& diag, const dyld_chained_starts_in_image* starts, uintptr_t slide,
|
|
Array<const void*> bindTargets, void (^logFixup)(void* loc, void* newValue)) const
|
|
{
|
|
forEachFixupInAllChains(diag, starts, true, ^(ChainedFixupPointerOnDisk* fixupLoc, const dyld_chained_starts_in_segment* segInfo, bool& stop) {
|
|
void* newValue;
|
|
switch (segInfo->pointer_format) {
|
|
#if __LP64__
|
|
#if __has_feature(ptrauth_calls)
|
|
case DYLD_CHAINED_PTR_ARM64E:
|
|
case DYLD_CHAINED_PTR_ARM64E_KERNEL:
|
|
case DYLD_CHAINED_PTR_ARM64E_USERLAND:
|
|
case DYLD_CHAINED_PTR_ARM64E_USERLAND24:
|
|
if ( fixupLoc->arm64e.authRebase.auth ) {
|
|
if ( fixupLoc->arm64e.authBind.bind ) {
|
|
uint32_t bindOrdinal = (segInfo->pointer_format == DYLD_CHAINED_PTR_ARM64E_USERLAND24) ? fixupLoc->arm64e.authBind24.ordinal : fixupLoc->arm64e.authBind.ordinal;
|
|
if ( bindOrdinal >= bindTargets.count() ) {
|
|
diag.error("out of range bind ordinal %d (max %lu)", bindOrdinal, bindTargets.count());
|
|
stop = true;
|
|
break;
|
|
}
|
|
else {
|
|
// authenticated bind
|
|
newValue = (void*)(bindTargets[bindOrdinal]);
|
|
if (newValue != 0) // Don't sign missing weak imports
|
|
newValue = (void*)fixupLoc->arm64e.signPointer(fixupLoc, (uintptr_t)newValue);
|
|
}
|
|
}
|
|
else {
|
|
// authenticated rebase
|
|
newValue = (void*)fixupLoc->arm64e.signPointer(fixupLoc, (uintptr_t)this + fixupLoc->arm64e.authRebase.target);
|
|
}
|
|
}
|
|
else {
|
|
if ( fixupLoc->arm64e.bind.bind ) {
|
|
uint32_t bindOrdinal = (segInfo->pointer_format == DYLD_CHAINED_PTR_ARM64E_USERLAND24) ? fixupLoc->arm64e.bind24.ordinal : fixupLoc->arm64e.bind.ordinal;
|
|
if ( bindOrdinal >= bindTargets.count() ) {
|
|
diag.error("out of range bind ordinal %d (max %lu)", bindOrdinal, bindTargets.count());
|
|
stop = true;
|
|
break;
|
|
}
|
|
else {
|
|
// plain bind
|
|
newValue = (void*)((long)bindTargets[bindOrdinal] + fixupLoc->arm64e.signExtendedAddend());
|
|
}
|
|
}
|
|
else {
|
|
// plain rebase (old format target is vmaddr, new format target is offset)
|
|
if ( segInfo->pointer_format == DYLD_CHAINED_PTR_ARM64E )
|
|
newValue = (void*)(fixupLoc->arm64e.unpackTarget()+slide);
|
|
else
|
|
newValue = (void*)((uintptr_t)this + fixupLoc->arm64e.unpackTarget());
|
|
}
|
|
}
|
|
if ( logFixup )
|
|
logFixup(fixupLoc, newValue);
|
|
fixupLoc->raw64 = (uintptr_t)newValue;
|
|
break;
|
|
#endif
|
|
case DYLD_CHAINED_PTR_64:
|
|
case DYLD_CHAINED_PTR_64_OFFSET:
|
|
if ( fixupLoc->generic64.bind.bind ) {
|
|
if ( fixupLoc->generic64.bind.ordinal >= bindTargets.count() ) {
|
|
diag.error("out of range bind ordinal %d (max %lu)", fixupLoc->generic64.bind.ordinal, bindTargets.count());
|
|
stop = true;
|
|
break;
|
|
}
|
|
else {
|
|
newValue = (void*)((long)bindTargets[fixupLoc->generic64.bind.ordinal] + fixupLoc->generic64.signExtendedAddend());
|
|
}
|
|
}
|
|
else {
|
|
// plain rebase (old format target is vmaddr, new format target is offset)
|
|
if ( segInfo->pointer_format == DYLD_CHAINED_PTR_64 )
|
|
newValue = (void*)(fixupLoc->generic64.unpackedTarget()+slide);
|
|
else
|
|
newValue = (void*)((uintptr_t)this + fixupLoc->generic64.unpackedTarget());
|
|
}
|
|
if ( logFixup )
|
|
logFixup(fixupLoc, newValue);
|
|
fixupLoc->raw64 = (uintptr_t)newValue;
|
|
break;
|
|
#else
|
|
case DYLD_CHAINED_PTR_32:
|
|
if ( fixupLoc->generic32.bind.bind ) {
|
|
if ( fixupLoc->generic32.bind.ordinal >= bindTargets.count() ) {
|
|
diag.error("out of range bind ordinal %d (max %lu)", fixupLoc->generic32.bind.ordinal, bindTargets.count());
|
|
stop = true;
|
|
break;
|
|
}
|
|
else {
|
|
newValue = (void*)((long)bindTargets[fixupLoc->generic32.bind.ordinal] + fixupLoc->generic32.bind.addend);
|
|
}
|
|
}
|
|
else {
|
|
if ( fixupLoc->generic32.rebase.target > segInfo->max_valid_pointer ) {
|
|
// handle non-pointers in chain
|
|
uint32_t bias = (0x04000000 + segInfo->max_valid_pointer)/2;
|
|
newValue = (void*)(fixupLoc->generic32.rebase.target - bias);
|
|
}
|
|
else {
|
|
newValue = (void*)(fixupLoc->generic32.rebase.target + slide);
|
|
}
|
|
}
|
|
if ( logFixup )
|
|
logFixup(fixupLoc, newValue);
|
|
fixupLoc->raw32 = (uint32_t)(uintptr_t)newValue;
|
|
break;
|
|
#endif // __LP64__
|
|
default:
|
|
diag.error("unsupported pointer chain format: 0x%04X", segInfo->pointer_format);
|
|
stop = true;
|
|
break;
|
|
}
|
|
});
|
|
}
|
|
#endif
|
|
|
|
|
|
bool MachOLoaded::walkChain(Diagnostics& diag, ChainedFixupPointerOnDisk* chain, uint16_t pointer_format, bool notifyNonPointers, uint32_t max_valid_pointer,
|
|
void (^handler)(ChainedFixupPointerOnDisk* fixupLocation, bool& stop)) const
|
|
{
|
|
const unsigned stride = ChainedFixupPointerOnDisk::strideSize(pointer_format);
|
|
bool stop = false;
|
|
bool chainEnd = false;
|
|
while (!stop && !chainEnd) {
|
|
// copy chain content, in case handler modifies location to final value
|
|
ChainedFixupPointerOnDisk chainContent = *chain;
|
|
handler(chain, stop);
|
|
if ( !stop ) {
|
|
switch (pointer_format) {
|
|
case DYLD_CHAINED_PTR_ARM64E:
|
|
case DYLD_CHAINED_PTR_ARM64E_KERNEL:
|
|
case DYLD_CHAINED_PTR_ARM64E_USERLAND:
|
|
case DYLD_CHAINED_PTR_ARM64E_USERLAND24:
|
|
case DYLD_CHAINED_PTR_ARM64E_FIRMWARE:
|
|
if ( chainContent.arm64e.rebase.next == 0 )
|
|
chainEnd = true;
|
|
else
|
|
chain = (ChainedFixupPointerOnDisk*)((uint8_t*)chain + chainContent.arm64e.rebase.next*stride);
|
|
break;
|
|
case DYLD_CHAINED_PTR_64:
|
|
case DYLD_CHAINED_PTR_64_OFFSET:
|
|
if ( chainContent.generic64.rebase.next == 0 )
|
|
chainEnd = true;
|
|
else
|
|
chain = (ChainedFixupPointerOnDisk*)((uint8_t*)chain + chainContent.generic64.rebase.next*4);
|
|
break;
|
|
case DYLD_CHAINED_PTR_32:
|
|
if ( chainContent.generic32.rebase.next == 0 )
|
|
chainEnd = true;
|
|
else {
|
|
chain = (ChainedFixupPointerOnDisk*)((uint8_t*)chain + chainContent.generic32.rebase.next*4);
|
|
if ( !notifyNonPointers ) {
|
|
while ( (chain->generic32.rebase.bind == 0) && (chain->generic32.rebase.target > max_valid_pointer) ) {
|
|
// not a real pointer, but a non-pointer co-opted into chain
|
|
chain = (ChainedFixupPointerOnDisk*)((uint8_t*)chain + chain->generic32.rebase.next*4);
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
case DYLD_CHAINED_PTR_64_KERNEL_CACHE:
|
|
case DYLD_CHAINED_PTR_X86_64_KERNEL_CACHE:
|
|
if ( chainContent.kernel64.next == 0 )
|
|
chainEnd = true;
|
|
else
|
|
chain = (ChainedFixupPointerOnDisk*)((uint8_t*)chain + chainContent.kernel64.next*stride);
|
|
break;
|
|
case DYLD_CHAINED_PTR_32_FIRMWARE:
|
|
if ( chainContent.firmware32.next == 0 )
|
|
chainEnd = true;
|
|
else
|
|
chain = (ChainedFixupPointerOnDisk*)((uint8_t*)chain + chainContent.firmware32.next*4);
|
|
break;
|
|
default:
|
|
diag.error("unknown pointer format 0x%04X", pointer_format);
|
|
stop = true;
|
|
}
|
|
}
|
|
}
|
|
return stop;
|
|
}
|
|
|
|
void MachOLoaded::forEachFixupChainSegment(Diagnostics& diag, const dyld_chained_starts_in_image* starts,
|
|
void (^handler)(const dyld_chained_starts_in_segment* segInfo, uint32_t segIndex, bool& stop)) const
|
|
{
|
|
bool stopped = false;
|
|
for (uint32_t segIndex=0; segIndex < starts->seg_count && !stopped; ++segIndex) {
|
|
if ( starts->seg_info_offset[segIndex] == 0 )
|
|
continue;
|
|
const dyld_chained_starts_in_segment* segInfo = (dyld_chained_starts_in_segment*)((uint8_t*)starts + starts->seg_info_offset[segIndex]);
|
|
handler(segInfo, segIndex, stopped);
|
|
}
|
|
}
|
|
|
|
void MachOLoaded::forEachFixupInSegmentChains(Diagnostics& diag, const dyld_chained_starts_in_segment* segInfo, bool notifyNonPointers,
|
|
void (^handler)(ChainedFixupPointerOnDisk* fixupLocation, const dyld_chained_starts_in_segment* segInfo, bool& stop)) const
|
|
{
|
|
auto adaptor = ^(ChainedFixupPointerOnDisk* fixupLocation, bool& stop) {
|
|
handler(fixupLocation, segInfo, stop);
|
|
};
|
|
bool stopped = false;
|
|
for (uint32_t pageIndex=0; pageIndex < segInfo->page_count && !stopped; ++pageIndex) {
|
|
uint16_t offsetInPage = segInfo->page_start[pageIndex];
|
|
if ( offsetInPage == DYLD_CHAINED_PTR_START_NONE )
|
|
continue;
|
|
if ( offsetInPage & DYLD_CHAINED_PTR_START_MULTI ) {
|
|
// 32-bit chains which may need multiple starts per page
|
|
uint32_t overflowIndex = offsetInPage & ~DYLD_CHAINED_PTR_START_MULTI;
|
|
bool chainEnd = false;
|
|
while (!stopped && !chainEnd) {
|
|
chainEnd = (segInfo->page_start[overflowIndex] & DYLD_CHAINED_PTR_START_LAST);
|
|
offsetInPage = (segInfo->page_start[overflowIndex] & ~DYLD_CHAINED_PTR_START_LAST);
|
|
uint8_t* pageContentStart = (uint8_t*)this + segInfo->segment_offset + (pageIndex * segInfo->page_size);
|
|
ChainedFixupPointerOnDisk* chain = (ChainedFixupPointerOnDisk*)(pageContentStart+offsetInPage);
|
|
stopped = walkChain(diag, chain, segInfo->pointer_format, notifyNonPointers, segInfo->max_valid_pointer, adaptor);
|
|
++overflowIndex;
|
|
}
|
|
}
|
|
else {
|
|
// one chain per page
|
|
uint8_t* pageContentStart = (uint8_t*)this + segInfo->segment_offset + (pageIndex * segInfo->page_size);
|
|
ChainedFixupPointerOnDisk* chain = (ChainedFixupPointerOnDisk*)(pageContentStart+offsetInPage);
|
|
stopped = walkChain(diag, chain, segInfo->pointer_format, notifyNonPointers, segInfo->max_valid_pointer, adaptor);
|
|
}
|
|
}
|
|
}
|
|
|
|
void MachOLoaded::forEachFixupInAllChains(Diagnostics& diag, const dyld_chained_starts_in_image* starts, bool notifyNonPointers,
|
|
void (^handler)(ChainedFixupPointerOnDisk* fixupLocation, const dyld_chained_starts_in_segment* segInfo, bool& stop)) const
|
|
{
|
|
bool stopped = false;
|
|
for (uint32_t segIndex=0; segIndex < starts->seg_count && !stopped; ++segIndex) {
|
|
if ( starts->seg_info_offset[segIndex] == 0 )
|
|
continue;
|
|
const dyld_chained_starts_in_segment* segInfo = (dyld_chained_starts_in_segment*)((uint8_t*)starts + starts->seg_info_offset[segIndex]);
|
|
forEachFixupInSegmentChains(diag, segInfo, notifyNonPointers, handler);
|
|
}
|
|
}
|
|
|
|
void MachOLoaded::forEachFixupInAllChains(Diagnostics& diag, uint16_t pointer_format, uint32_t starts_count, const uint32_t chain_starts[],
|
|
void (^handler)(ChainedFixupPointerOnDisk* fixupLocation, bool& stop)) const
|
|
{
|
|
for (uint32_t i=0; i < starts_count; ++i) {
|
|
ChainedFixupPointerOnDisk* chain = (ChainedFixupPointerOnDisk*)((uint8_t*)this + chain_starts[i]);
|
|
if ( walkChain(diag, chain, pointer_format, false, 0, handler) )
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
} // namespace dyld3
|
|
|