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--- dyld/dyld-852/src/ImageLoaderMachO.cpp
+++ dyld/dyld-625.13/src/ImageLoaderMachO.cpp
@@ -39,7 +39,6 @@
#include <mach/thread_status.h>
#include <mach-o/loader.h>
#include <mach-o/nlist.h>
-#include <mach-o/dyld_images.h>
#include <sys/sysctl.h>
#include <sys/syscall.h>
#include <libkern/OSAtomic.h>
@@ -56,18 +55,62 @@
#if SUPPORT_CLASSIC_MACHO
#include "ImageLoaderMachOClassic.h"
#endif
+#include "mach-o/dyld_images.h"
#include "Tracing.h"
-#include "dyld2.h"
+#include "dyld.h"
// <rdar://problem/8718137> use stack guard random value to add padding between dylibs
extern "C" long __stack_chk_guard;
-#define LIBSYSTEM_DYLIB_PATH "/usr/lib/libSystem.B.dylib"
-#define LIBDYLD_DYLIB_PATH "/usr/lib/system/libdyld.dylib"
-#if TARGET_OS_OSX
- #define DRIVERKIT_LIBSYSTEM_DYLIB_PATH "/System/DriverKit/usr/lib/libSystem.dylib"
- #define DRIVERKIT_LIBDYLD_DYLIB_PATH "/System/DriverKit/usr/lib/system/libdyld.dylib"
-#endif
+#ifndef LC_LOAD_UPWARD_DYLIB
+ #define LC_LOAD_UPWARD_DYLIB (0x23|LC_REQ_DYLD) /* load of dylib whose initializers run later */
+#endif
+
+#ifndef LC_VERSION_MIN_TVOS
+ #define LC_VERSION_MIN_TVOS 0x2F
+#endif
+
+#ifndef LC_VERSION_MIN_WATCHOS
+ #define LC_VERSION_MIN_WATCHOS 0x30
+#endif
+
+#ifndef LC_BUILD_VERSION
+ #define LC_BUILD_VERSION 0x32 /* build for platform min OS version */
+
+ /*
+ * The build_version_command contains the min OS version on which this
+ * binary was built to run for its platform. The list of known platforms and
+ * tool values following it.
+ */
+ struct build_version_command {
+ uint32_t cmd; /* LC_BUILD_VERSION */
+ uint32_t cmdsize; /* sizeof(struct build_version_command) plus */
+ /* ntools * sizeof(struct build_tool_version) */
+ uint32_t platform; /* platform */
+ uint32_t minos; /* X.Y.Z is encoded in nibbles xxxx.yy.zz */
+ uint32_t sdk; /* X.Y.Z is encoded in nibbles xxxx.yy.zz */
+ uint32_t ntools; /* number of tool entries following this */
+ };
+
+ struct build_tool_version {
+ uint32_t tool; /* enum for the tool */
+ uint32_t version; /* version number of the tool */
+ };
+
+ /* Known values for the platform field above. */
+ #define PLATFORM_MACOS 1
+ #define PLATFORM_IOS 2
+ #define PLATFORM_TVOS 3
+ #define PLATFORM_WATCHOS 4
+ #define PLATFORM_BRIDGEOS 5
+
+ /* Known values for the tool field above. */
+ #define TOOL_CLANG 1
+ #define TOOL_SWIFT 2
+ #define TOOL_LD 3
+#endif
+
+#define LIBSYSTEM_DYLIB_PATH "/usr/lib/libSystem.B.dylib"
// relocation_info.r_length field has value 3 for 64-bit executables and value 2 for 32-bit executables
#if __LP64__
@@ -97,8 +140,6 @@
#if TEXT_RELOC_SUPPORT
fTextSegmentRebases(false),
fTextSegmentBinds(false),
-#else
- fReadOnlyDataSegment(false),
#endif
#if __i386__
fReadOnlyImportSegment(false),
@@ -127,7 +168,7 @@
}
-#if TARGET_OS_OSX
+#if __MAC_OS_X_VERSION_MIN_REQUIRED
static uintptr_t pageAlign(uintptr_t value)
{
return (value + 4095) & (-4096);
@@ -148,6 +189,8 @@
const uint32_t cmd_count = mh->ncmds;
const uint32_t sizeofcmds = mh->sizeofcmds;
+ if ( sizeofcmds > (MAX_MACH_O_HEADER_AND_LOAD_COMMANDS_SIZE-sizeof(macho_header)) )
+ dyld::throwf("malformed mach-o: load commands size (%u) > %u", sizeofcmds, MAX_MACH_O_HEADER_AND_LOAD_COMMANDS_SIZE);
if ( cmd_count > (sizeofcmds/sizeof(load_command)) )
dyld::throwf("malformed mach-o: ncmds (%u) too large to fit in sizeofcmds (%u)", cmd_count, sizeofcmds);
const struct load_command* const startCmds = (struct load_command*)(((uint8_t*)mh) + sizeof(macho_header));
@@ -157,8 +200,6 @@
const macho_segment_command* linkeditSegCmd = NULL;
const macho_segment_command* startOfFileSegCmd = NULL;
const dyld_info_command* dyldInfoCmd = NULL;
- const linkedit_data_command* chainedFixupsCmd = NULL;
- const linkedit_data_command* exportsTrieCmd = NULL;
const symtab_command* symTabCmd = NULL;
const dysymtab_command* dynSymbTabCmd = NULL;
for (uint32_t i = 0; i < cmd_count; ++i) {
@@ -182,20 +223,9 @@
dyldInfoCmd = (struct dyld_info_command*)cmd;
*compressed = true;
break;
- case LC_DYLD_CHAINED_FIXUPS:
- if ( cmd->cmdsize != sizeof(linkedit_data_command) )
- throw "malformed mach-o image: LC_DYLD_CHAINED_FIXUPS size wrong";
- chainedFixupsCmd = (struct linkedit_data_command*)cmd;
- *compressed = true;
- break;
- case LC_DYLD_EXPORTS_TRIE:
- if ( cmd->cmdsize != sizeof(linkedit_data_command) )
- throw "malformed mach-o image: LC_DYLD_EXPORTS_TRIE size wrong";
- exportsTrieCmd = (struct linkedit_data_command*)cmd;
- break;
case LC_SEGMENT_COMMAND:
segCmd = (struct macho_segment_command*)cmd;
-#if TARGET_OS_OSX
+#if __MAC_OS_X_VERSION_MIN_REQUIRED
// rdar://problem/19617624 allow unmapped segments on OSX (but not iOS)
if ( ((segCmd->filesize) > pageAlign(segCmd->vmsize)) && (segCmd->vmsize != 0) )
#else
@@ -211,7 +241,7 @@
if ( segCmd->vmsize != 0 )
*segCount += 1;
if ( strcmp(segCmd->segname, "__LINKEDIT") == 0 ) {
- #if TARGET_OS_SIMULATOR
+ #if TARGET_IPHONE_SIMULATOR
// Note: should check on all platforms that __LINKEDIT is read-only, but <rdar://problem/22637626&22525618>
if ( segCmd->initprot != VM_PROT_READ )
throw "malformed mach-o image: __LINKEDIT segment does not have read-only permissions";
@@ -305,7 +335,6 @@
case LC_LOAD_UPWARD_DYLIB:
*libCount += 1;
// fall thru
- [[clang::fallthrough]];
case LC_ID_DYLIB:
dylibCmd = (dylib_command*)cmd;
if ( dylibCmd->dylib.name.offset > cmdLength )
@@ -347,12 +376,12 @@
throw "malformed mach-o image: LC_DYSYMTAB size wrong";
dynSymbTabCmd = (dysymtab_command*)cmd;
break;
-#if TARGET_OS_OSX
+#if __MAC_OS_X_VERSION_MIN_REQUIRED
// <rdar://problem/26797345> error when loading iOS Simulator mach-o binary into macOS process
case LC_VERSION_MIN_WATCHOS:
case LC_VERSION_MIN_TVOS:
case LC_VERSION_MIN_IPHONEOS:
- if ( !context.iOSonMac )
+ if ( !context.marzipan )
throw "mach-o, but built for simulator (not macOS)";
break;
#endif
@@ -367,7 +396,7 @@
if ( !inCache && (startOfFileSegCmd == NULL) )
throw "malformed mach-o image: missing __TEXT segment that maps start of file";
// <rdar://problem/13145644> verify every segment does not overlap another segment
- if ( context.strictMachORequired && !inCache ) {
+ if ( context.strictMachORequired ) {
uintptr_t lastFileStart = 0;
uintptr_t linkeditFileStart = 0;
const struct load_command* cmd1 = startCmds;
@@ -414,8 +443,8 @@
}
// validate linkedit content
- if ( (dyldInfoCmd == NULL) && (chainedFixupsCmd == NULL) && (symTabCmd == NULL) )
- throw "malformed mach-o image: missing LC_SYMTAB, LC_DYLD_INFO, or LC_DYLD_CHAINED_FIXUPS";
+ if ( (dyldInfoCmd == NULL) && (symTabCmd == NULL) )
+ throw "malformed mach-o image: missing LC_SYMTAB or LC_DYLD_INFO";
if ( dynSymbTabCmd == NULL )
throw "malformed mach-o image: missing LC_DYSYMTAB";
@@ -470,22 +499,6 @@
if ( offset > linkeditFileOffsetEnd )
throw "malformed mach-o image: dyld export info overruns __LINKEDIT";
}
- }
-
- if ( !inCache && (chainedFixupsCmd != NULL) && context.strictMachORequired ) {
- // validate all LC_DYLD_CHAINED_FIXUPS chunks fit in LINKEDIT and don't overlap
- if ( chainedFixupsCmd->dataoff < linkeditFileOffsetStart )
- throw "malformed mach-o image: dyld chained fixups info underruns __LINKEDIT";
- if ( (chainedFixupsCmd->dataoff + chainedFixupsCmd->datasize) > linkeditFileOffsetEnd )
- throw "malformed mach-o image: dyld chained fixups info overruns __LINKEDIT";
- }
-
- if ( !inCache && (exportsTrieCmd != NULL) && context.strictMachORequired ) {
- // validate all LC_DYLD_EXPORTS_TRIE chunks fit in LINKEDIT and don't overlap
- if ( exportsTrieCmd->dataoff < linkeditFileOffsetStart )
- throw "malformed mach-o image: dyld chained fixups info underruns __LINKEDIT";
- if ( (exportsTrieCmd->dataoff + exportsTrieCmd->datasize) > linkeditFileOffsetEnd )
- throw "malformed mach-o image: dyld chained fixups info overruns __LINKEDIT";
}
if ( symTabCmd != NULL ) {
@@ -508,13 +521,6 @@
if ( context.strictMachORequired || (symTabCmd->stroff + symTabCmd->strsize > ((linkeditFileOffsetEnd + 4095) & (-4096))) )
throw "malformed mach-o image: symbol strings overrun __LINKEDIT";
}
-#if TARGET_OS_OSX
- if ( (symTabCmd->symoff % sizeof(void*)) != 0 ) {
- // <rdar://53723577> allow old malformed plugins in new app
- if ( sdkVersion((mach_header*)mh) >= DYLD_PACKED_VERSION(10,15,0) )
- throw "malformed mach-o image: mis-aligned symbol table __LINKEDIT";
- }
-#endif
// validate indirect symbol table
if ( dynSymbTabCmd->nindirectsyms != 0 ) {
if ( dynSymbTabCmd->indirectsymoff < linkeditFileOffsetStart )
@@ -554,10 +560,6 @@
if ( needsAddedLibSystemDepency(*libCount, mh) )
*libCount = 1;
-
- // dylibs that use LC_DYLD_CHAINED_FIXUPS have that load command removed when put in the dyld cache
- if ( !*compressed && (mh->flags & MH_DYLIB_IN_CACHE) )
- *compressed = true;
}
@@ -670,7 +672,7 @@
for(unsigned int i=0; i < fSegmentsCount; ++i) {
// set up pointer to __LINKEDIT segment
if ( strcmp(segName(i),"__LINKEDIT") == 0 ) {
- #if !TARGET_OS_OSX
+ #if !__MAC_OS_X_VERSION_MIN_REQUIRED
// <rdar://problem/42419336> historically, macOS never did this check
if ( segFileOffset(i) > fCoveredCodeLength )
dyld::throwf("cannot load '%s' (segment outside of code signature)", this->getShortName());
@@ -685,9 +687,6 @@
if ( segHasBindFixUps(i) )
fTextSegmentBinds = true;
}
-#else
- if ( segIsReadOnlyData(i) )
- fReadOnlyDataSegment = true;
#endif
#if __i386__
if ( segIsReadOnlyImport(i) )
@@ -713,8 +712,6 @@
// walk load commands (mapped in at start of __TEXT segment)
const dyld_info_command* dyldInfo = NULL;
- const linkedit_data_command* chainedFixupsCmd = NULL;
- const linkedit_data_command* exportsTrieCmd = NULL;
const macho_nlist* symbolTable = NULL;
const char* symbolTableStrings = NULL;
const struct load_command* firstUnknownCmd = NULL;
@@ -751,17 +748,11 @@
case LC_DYLD_INFO_ONLY:
dyldInfo = (struct dyld_info_command*)cmd;
break;
- case LC_DYLD_CHAINED_FIXUPS:
- chainedFixupsCmd = (struct linkedit_data_command*)cmd;
- break;
- case LC_DYLD_EXPORTS_TRIE:
- exportsTrieCmd = (struct linkedit_data_command*)cmd;
- break;
case LC_SEGMENT_COMMAND:
{
const struct macho_segment_command* seg = (struct macho_segment_command*)cmd;
const bool isTextSeg = (strcmp(seg->segname, "__TEXT") == 0);
- #if __i386__ && TARGET_OS_OSX
+ #if __i386__ && __MAC_OS_X_VERSION_MIN_REQUIRED
const bool isObjCSeg = (strcmp(seg->segname, "__OBJC") == 0);
if ( isObjCSeg )
fNotifyObjC = true;
@@ -774,8 +765,6 @@
const uint8_t type = sect->flags & SECTION_TYPE;
if ( type == S_MOD_INIT_FUNC_POINTERS )
fHasInitializers = true;
- else if ( type == S_INIT_FUNC_OFFSETS )
- fHasInitializers = true;
else if ( type == S_MOD_TERM_FUNC_POINTERS )
fHasTerminators = true;
else if ( type == S_DTRACE_DOF )
@@ -785,7 +774,7 @@
else if ( isTextSeg && (strcmp(sect->sectname, "__unwind_info") == 0) )
fUnwindInfoSectionOffset = (uint32_t)((uint8_t*)sect - fMachOData);
- #if __i386__ && TARGET_OS_OSX
+ #if __i386__ && __MAC_OS_X_VERSION_MIN_REQUIRED
else if ( isObjCSeg ) {
if ( strcmp(sect->sectname, "__image_info") == 0 ) {
const uint32_t* imageInfo = (uint32_t*)(sect->addr + fSlide);
@@ -799,7 +788,7 @@
}
#else
else if ( isDataSeg && (strncmp(sect->sectname, "__objc_imageinfo", 16) == 0) ) {
- #if TARGET_OS_OSX
+ #if __MAC_OS_X_VERSION_MIN_REQUIRED
const uint32_t* imageInfo = (uint32_t*)(sect->addr + fSlide);
uint32_t flags = imageInfo[1];
if ( (flags & 4) && (((macho_header*)fMachOData)->filetype != MH_EXECUTE) )
@@ -826,6 +815,7 @@
case LC_REEXPORT_DYLIB:
case LC_LOAD_UPWARD_DYLIB:
case LC_MAIN:
+ // do nothing, just prevent LC_REQ_DYLD exception from occuring
break;
case LC_VERSION_MIN_MACOSX:
case LC_VERSION_MIN_IPHONEOS:
@@ -857,13 +847,9 @@
if ( dyldInfo != NULL )
this->setDyldInfo(dyldInfo);
- if ( chainedFixupsCmd != NULL )
- this->setChainedFixups(chainedFixupsCmd);
- if ( exportsTrieCmd != NULL )
- this->setExportsTrie(exportsTrieCmd);
-
if ( symbolTable != NULL)
this->setSymbolTableInfo(symbolTable, symbolTableStrings, dynSymbolTable);
+
}
// don't do this work in destructor because we need object to be full subclass
@@ -1013,13 +999,6 @@
}
#endif
-bool ImageLoaderMachO::segIsReadOnlyData(unsigned int segIndex) const
-{
- const macho_segment_command* segCmd = segLoadCommand(segIndex);
- return ( (segCmd->initprot & VM_PROT_WRITE)
- && ((segCmd->initprot & VM_PROT_EXECUTE) == 0)
- && (segCmd->flags & SG_READ_ONLY) );
-}
void ImageLoaderMachO::UnmapSegments()
{
@@ -1047,6 +1026,32 @@
}
+// prefetch __DATA/__OBJC pages during launch, but not for dynamically loaded code
+void ImageLoaderMachO::preFetchDATA(int fd, uint64_t offsetInFat, const LinkContext& context)
+{
+ if ( context.linkingMainExecutable ) {
+ for(unsigned int i=0, e=segmentCount(); i < e; ++i) {
+ if ( segWriteable(i) && (segFileSize(i) > 0) ) {
+ // prefetch writable segment that have mmap'ed regions
+ radvisory advice;
+ advice.ra_offset = offsetInFat + segFileOffset(i);
+ advice.ra_count = (int)segFileSize(i);
+ // limit prefetch to 1MB (256 pages)
+ if ( advice.ra_count > 1024*1024 )
+ advice.ra_count = 1024*1024;
+ // don't prefetch single pages, let them fault in
+ fgTotalBytesPreFetched += advice.ra_count;
+ fcntl(fd, F_RDADVISE, &advice);
+ if ( context.verboseMapping ) {
+ dyld::log("%18s prefetching 0x%0lX -> 0x%0lX\n",
+ segName(i), segActualLoadAddress(i), segActualLoadAddress(i)+advice.ra_count-1);
+ }
+ }
+ }
+ }
+}
+
+
bool ImageLoaderMachO::segmentsMustSlideTogether() const
{
return true;
@@ -1137,9 +1142,9 @@
disableCoverageCheck();
}
else {
-#if TARGET_OS_OSX
+#if __MAC_OS_X_VERSION_MIN_REQUIRED
// <rdar://problem/13622786> ignore code signatures in binaries built with pre-10.9 tools
- if ( this->sdkVersion() < DYLD_PACKED_VERSION(10,9,0) ) {
+ if ( this->sdkVersion() < DYLD_MACOSX_VERSION_10_9 ) {
disableCoverageCheck();
return;
}
@@ -1151,7 +1156,7 @@
siginfo.fs_blob_size=codeSigCmd->datasize; // size of CD
int result = fcntl(fd, F_ADDFILESIGS_RETURN, &siginfo);
-#if TARGET_OS_SIMULATOR
+#if TARGET_IPHONE_SIMULATOR
// rdar://problem/18759224> check range covered by the code directory after loading
// Attempt to fallback only if we are in the simulator
@@ -1189,10 +1194,10 @@
void ImageLoaderMachO::validateFirstPages(const struct linkedit_data_command* codeSigCmd, int fd, const uint8_t *fileData, size_t lenFileData, off_t offsetInFat, const LinkContext& context)
{
-#if TARGET_OS_OSX
+#if __MAC_OS_X_VERSION_MIN_REQUIRED
// rdar://problem/21839703> 15A226d: dyld crashes in mageLoaderMachO::validateFirstPages during dlopen() after encountering an mmap failure
// We need to ignore older code signatures because they will be bad.
- if ( this->sdkVersion() < DYLD_PACKED_VERSION(10,9,0) ) {
+ if ( this->sdkVersion() < DYLD_MACOSX_VERSION_10_9 ) {
return;
}
#endif
@@ -1344,13 +1349,8 @@
entry_point_command* mainCmd = (entry_point_command*)cmd;
void* entry = (void*)(mainCmd->entryoff + (char*)fMachOData);
// <rdar://problem/8543820&9228031> verify entry point is in image
- if ( this->containsAddress(entry) ) {
-#if __has_feature(ptrauth_calls)
- // start() calls the result pointer as a function pointer so we need to sign it.
- return __builtin_ptrauth_sign_unauthenticated(entry, 0, 0);
-#endif
+ if ( this->containsAddress(entry) )
return entry;
- }
else
throw "LC_MAIN entryoff is out of range";
}
@@ -1376,6 +1376,13 @@
#elif __x86_64__
const x86_thread_state64_t* registers = (x86_thread_state64_t*)(((char*)cmd) + 16);
void* entry = (void*)(registers->rip + fSlide);
+ // <rdar://problem/8543820&9228031> verify entry point is in image
+ if ( this->containsAddress(entry) )
+ return entry;
+ #elif __arm64__ && !__arm64e__
+ // temp support until <rdar://39514191> is fixed
+ const uint64_t* regs64 = (uint64_t*)(((char*)cmd) + 16);
+ void* entry = (void*)(regs64[32] + fSlide); // arm_thread_state64_t.__pc
// <rdar://problem/8543820&9228031> verify entry point is in image
if ( this->containsAddress(entry) )
return entry;
@@ -1411,10 +1418,10 @@
{
const dylib_command* dylibID = (dylib_command*)cmd;
const char* installPath = (char*)cmd + dylibID->dylib.name.offset;
- // It is OK for OS dylibs (libSystem or libmath) to have no dependents
+ // It is OK for OS dylibs (libSystem or libmath or Rosetta shims) to have no dependents
// but all other dylibs must depend on libSystem for initialization to initialize libSystem first
- isNonOSdylib = ( (strncmp(installPath, "/usr/lib/", 9) != 0) && (strncmp(installPath, "/System/DriverKit/usr/lib/", 26) != 0) );
- // if (isNonOSdylib) dyld::log("ImageLoaderMachO::needsAddedLibSystemDepency(%s)\n", installPath);
+ // <rdar://problem/6497528> rosetta circular dependency spew
+ isNonOSdylib = ( (strncmp(installPath, "/usr/lib/", 9) != 0) && (strncmp(installPath, "/usr/libexec/oah/Shims", 9) != 0) );
}
break;
}
@@ -1495,7 +1502,7 @@
const char* path = (char*)cmd + ((struct rpath_command*)cmd)->path.offset;
if ( (strncmp(path, "@loader_path", 12) == 0) && ((path[12] == '/') || (path[12] == '\0')) ) {
if ( !context.allowAtPaths && (context.mainExecutable == this) ) {
- dyld::warn("LC_RPATH %s in %s being ignored in restricted program because of @loader_path (Codesign main executable with Library Validation to allow @ paths)\n", path, this->getPath());
+ dyld::warn("LC_RPATH %s in %s being ignored in restricted program because of @loader_path\n", path, this->getPath());
break;
}
char resolvedPath[PATH_MAX];
@@ -1511,7 +1518,7 @@
}
else if ( (strncmp(path, "@executable_path", 16) == 0) && ((path[16] == '/') || (path[16] == '\0')) ) {
if ( !context.allowAtPaths) {
- dyld::warn("LC_RPATH %s in %s being ignored in restricted program because of @executable_path (Codesign main executable with Library Validation to allow @ paths)\n", path, this->getPath());
+ dyld::warn("LC_RPATH %s in %s being ignored in restricted program because of @executable_path\n", path, this->getPath());
break;
}
char resolvedPath[PATH_MAX];
@@ -1532,31 +1539,27 @@
#if SUPPORT_ROOT_PATH
else if ( (path[0] == '/') && (context.rootPaths != NULL) ) {
// <rdar://problem/5869973> DYLD_ROOT_PATH should apply to LC_RPATH rpaths
- // <rdar://problem/49576123> Even if DYLD_ROOT_PATH exists, LC_RPATH should add raw path to rpaths
// DYLD_ROOT_PATH can be a list of paths, but at this point we can only support one, so use first combination that exists
- for (const char** rp = context.rootPaths; *rp != NULL; ++rp) {
+ bool found = false;
+ for(const char** rp = context.rootPaths; *rp != NULL; ++rp) {
char newPath[PATH_MAX];
strlcpy(newPath, *rp, PATH_MAX);
strlcat(newPath, path, PATH_MAX);
struct stat stat_buf;
- if ( dyld3::stat(newPath, &stat_buf) != -1 ) {
- // dyld::log("combined DYLD_ROOT_PATH and LC_RPATH: %s\n", newPath);
- paths.push_back(strdup(newPath));
+ if ( stat(newPath, &stat_buf) != -1 ) {
+ //dyld::log("combined DYLD_ROOT_PATH and LC_RPATH: %s\n", newPath);
+ pathToAdd = strdup(newPath);
+ found = true;
+ break;
}
}
- // add in raw absolute path without root prefix
- pathToAdd = strdup(path);
+ if ( ! found ) {
+ // make copy so that all elements of 'paths' can be freed
+ pathToAdd = strdup(path);
+ }
}
#endif
else {
- // realpath() is slow, and /usr/lib/swift is a real path, so don't realpath it
- if ( strcmp(path, "/usr/lib/swift") != 0 ) {
- char resolvedPath[PATH_MAX];
- if ( (realpath(path, resolvedPath) != NULL) && (strcmp(path, resolvedPath) != 0) ) {
- // <rdar://problem/45470293> support LC_RPATH symlinks to directories of things in the dyld cache
- path = resolvedPath;
- }
- }
// make copy so that all elements of 'paths' can be freed
pathToAdd = strdup(path);
}
@@ -1633,7 +1636,7 @@
#endif
// if loaded at preferred address, no rebasing necessary
- if ( this->fSlide == 0 )
+ if ( this->fSlide == 0 )
return;
#if TEXT_RELOC_SUPPORT
@@ -2072,16 +2075,6 @@
extern "C" void stub_binding_helper();
extern "C" int _dyld_func_lookup(const char* name, void** address);
-static const char* libDyldPath(const ImageLoader::LinkContext& context)
-{
-#if TARGET_OS_OSX
- if ( context.driverKit )
- return DRIVERKIT_LIBDYLD_DYLIB_PATH;
- else
-#endif
- return LIBDYLD_DYLIB_PATH;
-}
-
void ImageLoaderMachO::setupLazyPointerHandler(const LinkContext& context)
{
const macho_header* mh = (macho_header*)fMachOData;
@@ -2110,7 +2103,7 @@
#endif // !__arm64__
// <rdar://problem/40352925> Add work around for existing apps that have deprecated __dyld section
const char* installNm = this->getInstallPath();
- if ( (mh->filetype != MH_DYLIB) || (installNm == NULL) || (strcmp(installNm, libDyldPath(context)) != 0) ) {
+ if ( (mh->filetype != MH_DYLIB) || (installNm == NULL) || (strcmp(installNm, "/usr/lib/system/libdyld.dylib") != 0) ) {
#if TARGET_OS_OSX
// don't allow macOS apps build with 10.14 or later SDK and targeting 10.8 or later to have a __dyld section
if ( (minOSVersion() >= 0x000a0800) && (sdkVersion() >= 0x000a0e00) )
@@ -2155,7 +2148,7 @@
}
else if ( mh->filetype == MH_DYLIB ) {
const char* installPath = this->getInstallPath();
- if ( (installPath != NULL) && ((strncmp(installPath, "/usr/lib/", 9) == 0) || (strncmp(installPath, "/System/DriverKit/usr/lib/", 26) == 0)) ) {
+ if ( (installPath != NULL) && (strncmp(installPath, "/usr/lib/", 9) == 0) ) {
if ( sect->size > offsetof(DATAdyld, vars) ) {
// use ProgramVars from libdyld.dylib but tweak mh field to correct value
dd->vars.mh = context.mainExecutable->machHeader();
@@ -2212,9 +2205,13 @@
bool ImageLoaderMachO::usablePrebinding(const LinkContext& context) const
{
- // dylibs in dyld cache do not need to be rebased or bound
- // for chained fixups always pretend dylib is up to date, patch tables will be used later
- if ( fInSharedCache && (this->allDependentLibrariesAsWhenPreBound() || context.dyldCache->header.builtFromChainedFixups) ) {
+ // if prebound and loaded at prebound address, and all libraries are same as when this was prebound, then no need to bind
+ if ( ((this->isPrebindable() && (this->getSlide() == 0)) || fInSharedCache)
+ && this->usesTwoLevelNameSpace()
+#if !USES_CHAINED_BINDS
+ && this->allDependentLibrariesAsWhenPreBound()
+#endif
+ ) {
// allow environment variables to disable prebinding
if ( context.bindFlat )
return false;
@@ -2274,18 +2271,6 @@
}
}
}
-
-static const char* libSystemPath(const ImageLoader::LinkContext& context)
-{
-#if TARGET_OS_OSX
- if ( context.driverKit )
- return DRIVERKIT_LIBSYSTEM_DYLIB_PATH;
- else
-#endif
- return LIBSYSTEM_DYLIB_PATH;
-}
-
-
void ImageLoaderMachO::doModInitFunctions(const LinkContext& context)
{
@@ -2315,7 +2300,7 @@
if ( ! dyld::gProcessInfo->libSystemInitialized ) {
// <rdar://problem/17973316> libSystem initializer must run first
const char* installPath = getInstallPath();
- if ( (installPath == NULL) || (strcmp(installPath, libSystemPath(context)) != 0) )
+ if ( (installPath == NULL) || (strcmp(installPath, LIBSYSTEM_DYLIB_PATH) != 0) )
dyld::throwf("initializer in image (%s) that does not link with libSystem.dylib\n", this->getPath());
}
if ( context.verboseInit )
@@ -2325,44 +2310,6 @@
dyld3::ScopedTimer(DBG_DYLD_TIMING_STATIC_INITIALIZER, (uint64_t)fMachOData, (uint64_t)func, 0);
func(context.argc, context.argv, context.envp, context.apple, &context.programVars);
}
- bool haveLibSystemHelpersAfter = (dyld::gLibSystemHelpers != NULL);
- if ( !haveLibSystemHelpersBefore && haveLibSystemHelpersAfter ) {
- // now safe to use malloc() and other calls in libSystem.dylib
- dyld::gProcessInfo->libSystemInitialized = true;
- }
- }
- }
- else if ( type == S_INIT_FUNC_OFFSETS ) {
- const uint32_t* inits = (uint32_t*)(sect->addr + fSlide);
- const size_t count = sect->size / sizeof(uint32_t);
- // Ensure section is within segment
- if ( (sect->addr < seg->vmaddr) || (sect->addr+sect->size > seg->vmaddr+seg->vmsize) || (sect->addr+sect->size < sect->addr) )
- dyld::throwf("__init_offsets section has malformed address range for %s\n", this->getPath());
- if ( seg->initprot & VM_PROT_WRITE )
- dyld::throwf("__init_offsets section is not in read-only segment %s\n", this->getPath());
- for (size_t j=0; j < count; ++j) {
- uint32_t funcOffset = inits[j];
- // verify initializers are in image
- if ( ! this->containsAddress((uint8_t*)this->machHeader() + funcOffset) ) {
- dyld::throwf("initializer function offset 0x%08X not in mapped image for %s\n", funcOffset, this->getPath());
- }
- if ( ! dyld::gProcessInfo->libSystemInitialized ) {
- // <rdar://problem/17973316> libSystem initializer must run first
- const char* installPath = getInstallPath();
- if ( (installPath == NULL) || (strcmp(installPath, libSystemPath(context)) != 0) )
- dyld::throwf("initializer in image (%s) that does not link with libSystem.dylib\n", this->getPath());
- }
- Initializer func = (Initializer)((uint8_t*)this->machHeader() + funcOffset);
- if ( context.verboseInit )
- dyld::log("dyld: calling initializer function %p in %s\n", func, this->getPath());
-#if __has_feature(ptrauth_calls)
- func = (Initializer)__builtin_ptrauth_sign_unauthenticated((void*)func, ptrauth_key_asia, 0);
-#endif
- bool haveLibSystemHelpersBefore = (dyld::gLibSystemHelpers != NULL);
- {
- dyld3::ScopedTimer(DBG_DYLD_TIMING_STATIC_INITIALIZER, (uint64_t)fMachOData, (uint64_t)func, 0);
- func(context.argc, context.argv, context.envp, context.apple, &context.programVars);
- }
bool haveLibSystemHelpersAfter = (dyld::gLibSystemHelpers != NULL);
if ( !haveLibSystemHelpersBefore && haveLibSystemHelpersAfter ) {
// now safe to use malloc() and other calls in libSystem.dylib
@@ -2489,13 +2436,13 @@
dyld::log("total images using weak symbols: %u\n", fgImagesRequiringCoalescing);
}
-intptr_t ImageLoaderMachO::assignSegmentAddresses(const LinkContext& context, size_t extraAllocationSize)
+
+intptr_t ImageLoaderMachO::assignSegmentAddresses(const LinkContext& context)
{
// preflight and calculate slide if needed
const bool inPIE = (fgNextPIEDylibAddress != 0);
intptr_t slide = 0;
if ( this->segmentsCanSlide() && this->segmentsMustSlideTogether() ) {
- intptr_t segmentReAlignSlide = 0;
bool needsToSlide = false;
bool imageHasPreferredLoadAddress = segHasPreferredLoadAddress(0);
uintptr_t lowAddr = (unsigned long)(-1);
@@ -2513,53 +2460,22 @@
lowAddr = segLow;
if ( segHigh > highAddr )
highAddr = segHigh;
-
-#if defined(__x86_64__) && !TARGET_OS_SIMULATOR
- // For Cambria on Aruba systems (16k page size), realign the image so the first segment ends on a 16k boundry.
- // FIXME: this can be removed when Aruba dev systems are no longer supported.
- if ( dyld::isTranslated() && vm_page_size == 0x4000 && i == 0 && segLow == 0 ) {
- const uintptr_t segHighPageOffset = segHigh & vm_page_mask;
- if ( segHighPageOffset > 0 ) {
- // Adjust the slide to make the first segment end on a page boundry.
- needsToSlide = true;
- segmentReAlignSlide = vm_page_size - segHighPageOffset;
-
- if (context.verboseMapping) {
- dyld::log("dyld: Image %s first segment(%s) does not end on a page boundry [0x%lx, 0x%lx) adding 0x%lx to slide to realign\n", getPath(), segName(i), segLow, segHigh, segmentReAlignSlide);
- }
- }
- }
-#endif
+
if ( needsToSlide || !imageHasPreferredLoadAddress || inPIE || !reserveAddressRange(segPreferredLoadAddress(i), segSize(i)) )
needsToSlide = true;
}
if ( needsToSlide ) {
// find a chunk of address space to hold all segments
- size_t size = highAddr-lowAddr+segmentReAlignSlide;
- uintptr_t addr = reserveAnAddressRange(size+extraAllocationSize, context);
- slide = addr - lowAddr + segmentReAlignSlide;
- } else if ( extraAllocationSize ) {
- if (!reserveAddressRange(highAddr, extraAllocationSize)) {
- throw "failed to reserve space for aot";
- }
+ uintptr_t addr = reserveAnAddressRange(highAddr-lowAddr, context);
+ slide = addr - lowAddr;
}
}
else if ( ! this->segmentsCanSlide() ) {
- uintptr_t highAddr = 0;
for(unsigned int i=0, e=segmentCount(); i < e; ++i) {
- const uintptr_t segLow = segPreferredLoadAddress(i);
- const uintptr_t segHigh = dyld_page_round(segLow + segSize(i));
-
- if ( segHigh > highAddr )
- highAddr = segHigh;
-
if ( (strcmp(segName(i), "__PAGEZERO") == 0) && (segFileSize(i) == 0) && (segPreferredLoadAddress(i) == 0) )
continue;
if ( !reserveAddressRange(segPreferredLoadAddress(i), segSize(i)) )
dyld::throwf("can't map unslidable segment %s to 0x%lX with size 0x%lX", segName(i), segPreferredLoadAddress(i), segSize(i));
- }
- if (extraAllocationSize) {
- dyld::throwf("binaries with non-slidable segments don't support aot: %s", this->getPath());
}
}
else {
@@ -2602,58 +2518,23 @@
return true;
}
+
+
void ImageLoaderMachO::mapSegments(int fd, uint64_t offsetInFat, uint64_t lenInFat, uint64_t fileLen, const LinkContext& context)
{
- uint64_t extra_allocation_size = 0;
-
-#if defined(__x86_64__) && !TARGET_OS_SIMULATOR
- if (dyld::isTranslated()) {
- fAotPath = new char[PATH_MAX];
- int ret = syscall(0x7000001, fd, this->getPath(), &extra_allocation_size, fAotPath, PATH_MAX);
- if (ret != 0) {
- delete fAotPath;
- fAotPath = nullptr;
- }
- }
-#endif
-
// find address range for image
- intptr_t slide = this->assignSegmentAddresses(context, extra_allocation_size);
+ intptr_t slide = this->assignSegmentAddresses(context);
if ( context.verboseMapping ) {
if ( offsetInFat != 0 )
dyld::log("dyld: Mapping %s (slice offset=%llu)\n", this->getPath(), (unsigned long long)offsetInFat);
else
dyld::log("dyld: Mapping %s\n", this->getPath());
}
-
- // <rdar://problem/47163421> speculatively read whole slice
- fspecread_t specread = {} ;
- specread.fsr_offset = offsetInFat;
- specread.fsr_length = lenInFat;
- specread.fsr_flags = 0;
- fcntl(fd, F_SPECULATIVE_READ, &specread);
- if ( context.verboseMapping )
- dyld::log("dyld: Speculatively read offset=0x%08llX, len=0x%08llX, path=%s\n", offsetInFat, lenInFat, this->getPath());
-
// map in all segments
- uintptr_t baseAddress = (unsigned long)(-1);
- uintptr_t endAddress = 0;
- uintptr_t mappedMachHeaderAddress = 0;
for(unsigned int i=0, e=segmentCount(); i < e; ++i) {
vm_offset_t fileOffset = (vm_offset_t)(segFileOffset(i) + offsetInFat);
vm_size_t size = segFileSize(i);
uintptr_t requestedLoadAddress = segPreferredLoadAddress(i) + slide;
- const uintptr_t segmentEnd = dyld_page_round(requestedLoadAddress + segSize(i));
-
- if ( requestedLoadAddress < baseAddress )
- baseAddress = requestedLoadAddress;
- if ( segmentEnd > endAddress )
- endAddress = segmentEnd;
-
- if (segFileOffset(i) == 0 && segFileSize(i) != 0) {
- mappedMachHeaderAddress = requestedLoadAddress;
- }
-
int protection = 0;
if ( !segUnaccessible(i) ) {
if ( segExecutable(i) )
@@ -2700,24 +2581,6 @@
(protection & PROT_READ) ? 'r' : '.', (protection & PROT_WRITE) ? 'w' : '.', (protection & PROT_EXEC) ? 'x' : '.' );
}
-#if defined(__x86_64__) && !TARGET_OS_SIMULATOR
- if (dyld::isTranslated() && extra_allocation_size != 0) {
- const struct mach_header* aot_load_address;
- dyld_aot_image_info aot_image_info = {};
- int ret = syscall(0x7000002, this->getPath(), mappedMachHeaderAddress, endAddress, &aot_load_address, &aot_image_info.aotImageSize, aot_image_info.aotImageKey);
- if (ret == 0) {
- extern void addAotImagesToAllAotImages(uint32_t aotInfoCount, const dyld_aot_image_info aotInfo[]);
-
- // fill in the aot load address, at this point the cambria trap has filled in
- // the image size and image key fields
- aot_image_info.aotLoadAddress = aot_load_address;
- aot_image_info.x86LoadAddress = (struct mach_header*)baseAddress;
-
- addAotImagesToAllAotImages(1, &aot_image_info);
- }
- }
-#endif
-
// update slide to reflect load location
this->setSlide(slide);
}
@@ -2725,7 +2588,7 @@
void ImageLoaderMachO::mapSegments(const void* memoryImage, uint64_t imageLen, const LinkContext& context)
{
// find address range for image
- intptr_t slide = this->assignSegmentAddresses(context, 0);
+ intptr_t slide = this->assignSegmentAddresses(context);
if ( context.verboseMapping )
dyld::log("dyld: Mapping memory %p\n", memoryImage);
// map in all segments
@@ -2743,52 +2606,24 @@
this->setSlide(slide);
// set R/W permissions on all segments at slide location
for(unsigned int i=0, e=segmentCount(); i < e; ++i) {
- segProtect(i, context);
- }
-}
-
-static vm_prot_t protectionForSegIndex(const ImageLoaderMachO* image, unsigned int segIndex)
-{
- if ( image->segUnaccessible(segIndex) )
- return 0;
+ segProtect(i, context);
+ }
+}
+
+
+void ImageLoaderMachO::segProtect(unsigned int segIndex, const ImageLoader::LinkContext& context)
+{
vm_prot_t protection = 0;
- if ( image->segExecutable(segIndex) )
- protection |= PROT_EXEC;
- if ( image->segReadable(segIndex) )
- protection |= PROT_READ;
- if ( image->segWriteable(segIndex) )
- protection |= PROT_WRITE;
- return protection;
-}
-
-
-void ImageLoaderMachO::segProtect(unsigned int segIndex, const ImageLoader::LinkContext& context)
-{
- vm_prot_t protection = protectionForSegIndex(this, segIndex);
+ if ( !segUnaccessible(segIndex) ) {
+ if ( segExecutable(segIndex) )
+ protection |= PROT_EXEC;
+ if ( segReadable(segIndex) )
+ protection |= PROT_READ;
+ if ( segWriteable(segIndex) )
+ protection |= PROT_WRITE;
+ }
vm_address_t addr = segActualLoadAddress(segIndex);
vm_size_t size = segSize(segIndex);
-
-#if defined(__x86_64__) && !TARGET_OS_SIMULATOR
- if ( dyld::isTranslated() ) {
- // <rdar://problem/60543794> can't vm_protect non-16KB segments
- if ( (segIndex > 0) && ((addr & 0x3FFF) != 0) ) {
- // overlaps previous segment
- vm_prot_t prevProt = protectionForSegIndex(this, segIndex-1);
- if ( (protection & prevProt) != prevProt ) {
- // previous had more bits, so we need to not apply new permissions to the overlap
- vm_size_t overlap = 0x4000 - (addr & 0x3FFF);
- addr += overlap;
- if ( size >= overlap )
- size -= overlap;
- else if ( size < overlap )
- size = 0;
- }
- if ( size == 0 )
- return;
- }
- }
-#endif
-
const bool setCurrentPermissions = false;
kern_return_t r = vm_protect(mach_task_self(), addr, size, setCurrentPermissions, protection);
if ( r != KERN_SUCCESS ) {
@@ -2913,6 +2748,8 @@
{
if ( lazyBindingInfoOffset > (lazyInfoEnd-lazyInfoStart) )
return false;
+ uint8_t type = BIND_TYPE_POINTER;
+ uint8_t symboFlags = 0;
bool done = false;
const uint8_t* p = &lazyInfoStart[lazyBindingInfoOffset];
while ( !done && (p < lazyInfoEnd) ) {
@@ -2941,11 +2778,13 @@
break;
case BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM:
*symbolName = (char*)p;
+ symboFlags = immediate;
while (*p != '\0')
++p;
++p;
break;
case BIND_OPCODE_SET_TYPE_IMM:
+ type = immediate;
break;
case BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB:
*segIndex = immediate;