#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
+
+
// relocation_info.r_length field has value 3 for 64-bit executables and value 2 for 32-bit executables
#if __LP64__
#define LC_SEGMENT_COMMAND LC_SEGMENT_64
ImageLoaderMachO::ImageLoaderMachO(const macho_header* mh, const char* path, unsigned int segCount,
uint32_t segOffsets[], unsigned int libCount)
- : ImageLoader(path, libCount), fMachOData((uint8_t*)mh), fLinkEditBase(NULL), fSlide(0),
+ : ImageLoader(path, libCount), fCoveredCodeLength(0), fMachOData((uint8_t*)mh), fLinkEditBase(NULL), fSlide(0),
fEHFrameSectionOffset(0), fUnwindInfoSectionOffset(0), fDylibIDOffset(0),
- fSegmentsCount(segCount), fIsSplitSeg(false), fInSharedCache(false),
+fSegmentsCount(segCount), fIsSplitSeg(false), fInSharedCache(false),
#if TEXT_RELOC_SUPPORT
fTextSegmentRebases(false),
fTextSegmentBinds(false),
// determine if this mach-o file has classic or compressed LINKEDIT and number of segments it has
-void ImageLoaderMachO::sniffLoadCommands(const macho_header* mh, const char* path, bool* compressed,
+void ImageLoaderMachO::sniffLoadCommands(const macho_header* mh, const char* path, bool inCache, bool* compressed,
unsigned int* segCount, unsigned int* libCount, const LinkContext& context,
- const linkedit_data_command** codeSigCmd)
+ const linkedit_data_command** codeSigCmd,
+ const encryption_info_command** encryptCmd)
{
*compressed = false;
*segCount = 0;
*libCount = 0;
*codeSigCmd = NULL;
- struct macho_segment_command* segCmd;
- bool foundLoadCommandSegment = false;
- uint32_t loadCommandSegmentIndex = 0xFFFFFFFF;
- uintptr_t loadCommandSegmentVMStart = 0;
- uintptr_t loadCommandSegmentVMEnd = 0;
+ *encryptCmd = NULL;
const uint32_t cmd_count = mh->ncmds;
const struct load_command* const startCmds = (struct load_command*)(((uint8_t*)mh) + sizeof(macho_header));
const struct load_command* const endCmds = (struct load_command*)(((uint8_t*)mh) + sizeof(macho_header) + mh->sizeofcmds);
const struct load_command* cmd = startCmds;
+ bool foundLoadCommandSegment = false;
for (uint32_t i = 0; i < cmd_count; ++i) {
uint32_t cmdLength = cmd->cmdsize;
+ struct macho_segment_command* segCmd;
if ( cmdLength < 8 ) {
dyld::throwf("malformed mach-o image: load command #%d length (%u) too small in %s",
i, cmdLength, path);
break;
case LC_SEGMENT_COMMAND:
segCmd = (struct macho_segment_command*)cmd;
+#if __MAC_OS_X_VERSION_MIN_REQUIRED
+ // rdar://problem/19617624 allow unmapped segments on OSX (but not iOS)
+ if ( (segCmd->filesize > segCmd->vmsize) && (segCmd->vmsize != 0) )
+#else
+ if ( segCmd->filesize > segCmd->vmsize )
+#endif
+ dyld::throwf("malformed mach-o image: segment load command %s filesize is larger than vmsize", segCmd->segname);
// ignore zero-sized segments
if ( segCmd->vmsize != 0 )
*segCount += 1;
- // <rdar://problem/7942521> all load commands must be in an executable segment
- if ( context.codeSigningEnforced && (segCmd->fileoff < mh->sizeofcmds) && (segCmd->filesize != 0) ) {
- if ( (segCmd->fileoff != 0) || (segCmd->filesize < (mh->sizeofcmds+sizeof(macho_header))) )
- dyld::throwf("malformed mach-o image: segment %s does not span all load commands", segCmd->segname);
- if ( segCmd->initprot != (VM_PROT_READ | VM_PROT_EXECUTE) )
- dyld::throwf("malformed mach-o image: load commands found in segment %s with wrong permissions", segCmd->segname);
- if ( foundLoadCommandSegment )
- throw "load commands in multiple segments";
- foundLoadCommandSegment = true;
- loadCommandSegmentIndex = i;
- loadCommandSegmentVMStart = segCmd->vmaddr;
- loadCommandSegmentVMEnd = segCmd->vmaddr + segCmd->vmsize;
- if ( (intptr_t)(segCmd->vmsize) < 0)
- dyld::throwf("malformed mach-o image: segment load command %s size too large", segCmd->segname);
- if ( loadCommandSegmentVMEnd < loadCommandSegmentVMStart )
+ if ( context.codeSigningEnforced ) {
+ uintptr_t vmStart = segCmd->vmaddr;
+ uintptr_t vmSize = segCmd->vmsize;
+ uintptr_t vmEnd = vmStart + vmSize;
+ uintptr_t fileStart = segCmd->fileoff;
+ uintptr_t fileSize = segCmd->filesize;
+ if ( (intptr_t)(vmEnd) < 0)
+ dyld::throwf("malformed mach-o image: segment load command %s vmsize too large", segCmd->segname);
+ if ( vmStart > vmEnd )
dyld::throwf("malformed mach-o image: segment load command %s wraps around address space", segCmd->segname);
+ if ( vmSize != fileSize ) {
+ if ( (segCmd->initprot == 0) && (fileSize != 0) )
+ dyld::throwf("malformed mach-o image: unaccessable segment %s has filesize != 0", segCmd->segname);
+ else if ( vmSize < fileSize )
+ dyld::throwf("malformed mach-o image: segment %s has vmsize < filesize", segCmd->segname);
+ }
+ if ( inCache ) {
+ if ( (fileSize != 0) && (segCmd->initprot == (VM_PROT_READ | VM_PROT_EXECUTE)) ) {
+ if ( foundLoadCommandSegment )
+ throw "load commands in multiple segments";
+ foundLoadCommandSegment = true;
+ }
+ }
+ else if ( (fileStart < mh->sizeofcmds) && (fileSize != 0) ) {
+ // <rdar://problem/7942521> all load commands must be in an executable segment
+ if ( (fileStart != 0) || (fileSize < (mh->sizeofcmds+sizeof(macho_header))) )
+ dyld::throwf("malformed mach-o image: segment %s does not span all load commands", segCmd->segname);
+ if ( segCmd->initprot != (VM_PROT_READ | VM_PROT_EXECUTE) )
+ dyld::throwf("malformed mach-o image: load commands found in segment %s with wrong permissions", segCmd->segname);
+ if ( foundLoadCommandSegment )
+ throw "load commands in multiple segments";
+ foundLoadCommandSegment = true;
+ }
+
+ const struct macho_section* const sectionsStart = (struct macho_section*)((char*)segCmd + sizeof(struct macho_segment_command));
+ const struct macho_section* const sectionsEnd = §ionsStart[segCmd->nsects];
+ for (const struct macho_section* sect=sectionsStart; sect < sectionsEnd; ++sect) {
+ if (!inCache && sect->offset != 0 && ((sect->offset + sect->size) > (segCmd->fileoff + segCmd->filesize)))
+ dyld::throwf("malformed mach-o image: section %s,%s of '%s' exceeds segment %s booundary", sect->segname, sect->sectname, path, segCmd->segname);
+ }
}
break;
case LC_SEGMENT_COMMAND_WRONG:
case LC_CODE_SIGNATURE:
*codeSigCmd = (struct linkedit_data_command*)cmd; // only support one LC_CODE_SIGNATURE per image
break;
+ case LC_ENCRYPTION_INFO:
+ case LC_ENCRYPTION_INFO_64:
+ *encryptCmd = (struct encryption_info_command*)cmd; // only support one LC_ENCRYPTION_INFO[_64] per image
+ break;
}
cmd = nextCmd;
}
-
+
if ( context.codeSigningEnforced && !foundLoadCommandSegment )
throw "load commands not in a segment";
- // <rdar://problem/13145644> verify another segment does not over-map load commands
- cmd = startCmds;
+
+ // <rdar://problem/13145644> verify every segment does not overlap another segment
if ( context.codeSigningEnforced ) {
+ uintptr_t lastFileStart = 0;
+ uintptr_t linkeditFileStart = 0;
+ const struct load_command* cmd1 = startCmds;
for (uint32_t i = 0; i < cmd_count; ++i) {
- switch (cmd->cmd) {
- case LC_SEGMENT_COMMAND:
- if ( i != loadCommandSegmentIndex ) {
- segCmd = (struct macho_segment_command*)cmd;
- uintptr_t start = segCmd->vmaddr;
- uintptr_t end = segCmd->vmaddr + segCmd->vmsize;
- if ( ((start <= loadCommandSegmentVMStart) && (end > loadCommandSegmentVMStart))
- || ((start >= loadCommandSegmentVMStart) && (start < loadCommandSegmentVMEnd)) )
- dyld::throwf("malformed mach-o image: segment %s overlaps load commands", segCmd->segname);
+ if ( cmd1->cmd == LC_SEGMENT_COMMAND ) {
+ struct macho_segment_command* segCmd1 = (struct macho_segment_command*)cmd1;
+ uintptr_t vmStart1 = segCmd1->vmaddr;
+ uintptr_t vmEnd1 = segCmd1->vmaddr + segCmd1->vmsize;
+ uintptr_t fileStart1 = segCmd1->fileoff;
+ uintptr_t fileEnd1 = segCmd1->fileoff + segCmd1->filesize;
+
+ if (fileStart1 > lastFileStart)
+ lastFileStart = fileStart1;
+
+ if ( strcmp(&segCmd1->segname[0], "__LINKEDIT") == 0 ) {
+ linkeditFileStart = fileStart1;
+ }
+
+ const struct load_command* cmd2 = startCmds;
+ for (uint32_t j = 0; j < cmd_count; ++j) {
+ if ( cmd2 == cmd1 )
+ continue;
+ if ( cmd2->cmd == LC_SEGMENT_COMMAND ) {
+ struct macho_segment_command* segCmd2 = (struct macho_segment_command*)cmd2;
+ uintptr_t vmStart2 = segCmd2->vmaddr;
+ uintptr_t vmEnd2 = segCmd2->vmaddr + segCmd2->vmsize;
+ uintptr_t fileStart2 = segCmd2->fileoff;
+ uintptr_t fileEnd2 = segCmd2->fileoff + segCmd2->filesize;
+ if ( ((vmStart2 <= vmStart1) && (vmEnd2 > vmStart1) && (vmEnd1 > vmStart1))
+ || ((vmStart2 >= vmStart1) && (vmStart2 < vmEnd1) && (vmEnd2 > vmStart2)) )
+ dyld::throwf("malformed mach-o image: segment %s vm overlaps segment %s", segCmd1->segname, segCmd2->segname);
+ if ( ((fileStart2 <= fileStart1) && (fileEnd2 > fileStart1) && (fileEnd1 > fileStart1))
+ || ((fileStart2 >= fileStart1) && (fileStart2 < fileEnd1) && (fileEnd2 > fileStart2)) )
+ dyld::throwf("malformed mach-o image: segment %s file content overlaps segment %s", segCmd1->segname, segCmd2->segname);
}
- break;
+ cmd2 = (const struct load_command*)(((char*)cmd2)+cmd2->cmdsize);
+ }
}
- cmd = (const struct load_command*)(((char*)cmd)+cmd->cmdsize);
+ cmd1 = (const struct load_command*)(((char*)cmd1)+cmd1->cmdsize);
}
+
+ if (lastFileStart != linkeditFileStart)
+ dyld::throwf("malformed mach-o image: __LINKEDIT must be last segment");
}
-
+
// fSegmentsArrayCount is only 8-bits
if ( *segCount > 255 )
dyld::throwf("malformed mach-o image: more than 255 segments in %s", path);
-
+
// fSegmentsArrayCount is only 8-bits
if ( *libCount > 4095 )
dyld::throwf("malformed mach-o image: more than 4095 dependent libraries in %s", path);
unsigned int segCount;
unsigned int libCount;
const linkedit_data_command* codeSigCmd;
- sniffLoadCommands(mh, path, &compressed, &segCount, &libCount, context, &codeSigCmd);
+ const encryption_info_command* encryptCmd;
+ sniffLoadCommands(mh, path, false, &compressed, &segCount, &libCount, context, &codeSigCmd, &encryptCmd);
// instantiate concrete class based on content of load commands
if ( compressed )
return ImageLoaderMachOCompressed::instantiateMainExecutable(mh, slide, path, segCount, libCount, context);
unsigned int segCount;
unsigned int libCount;
const linkedit_data_command* codeSigCmd;
- sniffLoadCommands((const macho_header*)fileData, path, &compressed, &segCount, &libCount, context, &codeSigCmd);
+ const encryption_info_command* encryptCmd;
+ sniffLoadCommands((const macho_header*)fileData, path, false, &compressed, &segCount, &libCount, context, &codeSigCmd, &encryptCmd);
// instantiate concrete class based on content of load commands
if ( compressed )
- return ImageLoaderMachOCompressed::instantiateFromFile(path, fd, fileData, offsetInFat, lenInFat, info, segCount, libCount, codeSigCmd, context);
+ return ImageLoaderMachOCompressed::instantiateFromFile(path, fd, fileData, dataSize, offsetInFat, lenInFat, info, segCount, libCount, codeSigCmd, encryptCmd, context);
else
#if SUPPORT_CLASSIC_MACHO
- return ImageLoaderMachOClassic::instantiateFromFile(path, fd, fileData, offsetInFat, lenInFat, info, segCount, libCount, codeSigCmd, context);
+ return ImageLoaderMachOClassic::instantiateFromFile(path, fd, fileData, dataSize, offsetInFat, lenInFat, info, segCount, libCount, codeSigCmd, context);
#else
throw "missing LC_DYLD_INFO load command";
#endif
unsigned int segCount;
unsigned int libCount;
const linkedit_data_command* codeSigCmd;
- sniffLoadCommands(mh, path, &compressed, &segCount, &libCount, context, &codeSigCmd);
+ const encryption_info_command* encryptCmd;
+ sniffLoadCommands(mh, path, true, &compressed, &segCount, &libCount, context, &codeSigCmd, &encryptCmd);
// instantiate concrete class based on content of load commands
if ( compressed )
return ImageLoaderMachOCompressed::instantiateFromCache(mh, path, slide, info, segCount, libCount, context);
unsigned int segCount;
unsigned int libCount;
const linkedit_data_command* sigcmd;
- sniffLoadCommands(mh, moduleName, &compressed, &segCount, &libCount, context, &sigcmd);
+ const encryption_info_command* encryptCmd;
+ sniffLoadCommands(mh, moduleName, false, &compressed, &segCount, &libCount, context, &sigcmd, &encryptCmd);
// instantiate concrete class based on content of load commands
if ( compressed )
return ImageLoaderMachOCompressed::instantiateFromMemory(moduleName, mh, len, segCount, libCount, context);
}
-void ImageLoaderMachO::parseLoadCmds()
+void ImageLoaderMachO::parseLoadCmds(const LinkContext& context)
{
// now that segments are mapped in, get real fMachOData, fLinkEditBase, and fSlide
for(unsigned int i=0; i < fSegmentsCount; ++i) {
// set up pointer to __LINKEDIT segment
- if ( strcmp(segName(i),"__LINKEDIT") == 0 )
+ if ( strcmp(segName(i),"__LINKEDIT") == 0 ) {
+ if ( context.codeSigningEnforced && (segFileOffset(i) > fCoveredCodeLength))
+ dyld::throwf("cannot load '%s' (segment outside of code signature)", this->getShortName());
fLinkEditBase = (uint8_t*)(segActualLoadAddress(i) - segFileOffset(i));
+ }
#if TEXT_RELOC_SUPPORT
// __TEXT segment always starts at beginning of file and contains mach_header and load commands
if ( segExecutable(i) ) {
break;
case LC_VERSION_MIN_MACOSX:
case LC_VERSION_MIN_IPHONEOS:
+ case LC_VERSION_MIN_TVOS:
+ case LC_VERSION_MIN_WATCHOS:
minOSVersionCmd = (version_min_command*)cmd;
break;
default:
dyld::throwf("required code signature missing for '%s'\n", this->getPath());
}
#endif
+ //Since we don't have a range for the signature we have to assume full coverage
+ fCoveredCodeLength = UINT64_MAX;
}
else {
#if __MAC_OS_X_VERSION_MIN_REQUIRED
siginfo.fs_file_start=offsetInFatFile; // start of mach-o slice in fat file
siginfo.fs_blob_start=(void*)(long)(codeSigCmd->dataoff); // start of CD in mach-o file
siginfo.fs_blob_size=codeSigCmd->datasize; // size of CD
- int result = fcntl(fd, F_ADDFILESIGS, &siginfo);
+ int result = fcntl(fd, F_ADDFILESIGS_RETURN, &siginfo);
+
+#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
+
+ if ( result == -1 ) {
+ result = fcntl(fd, F_ADDFILESIGS, &siginfo);
+ siginfo.fs_file_start = codeSigCmd->dataoff;
+ }
+#endif
+
if ( result == -1 ) {
if ( (errno == EPERM) || (errno == EBADEXEC) )
dyld::throwf("code signature invalid for '%s'\n", this->getPath());
if ( context.verboseCodeSignatures )
dyld::log("dyld: Failed registering code signature for %s, errno=%d\n", this->getPath(), errno);
+ siginfo.fs_file_start = UINT64_MAX;
+ } else if ( context.verboseCodeSignatures ) {
+ dyld::log("dyld: Registered code signature for %s\n", this->getPath());
+ }
+ fCoveredCodeLength = siginfo.fs_file_start;
+ }
+}
+
+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 __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_MACOSX_VERSION_10_9 ) {
+ return;
+ }
+#endif
+ if (codeSigCmd != NULL) {
+ if ( context.verboseMapping )
+ dyld::log("dyld: validate pages: %llu\n", (unsigned long long)offsetInFat);
+
+ void *fdata = xmmap(NULL, lenFileData, PROT_READ | PROT_EXEC, MAP_SHARED, fd, offsetInFat);
+ if ( fdata == MAP_FAILED ) {
+ if ( context.processRequiresLibraryValidation )
+ dyld::throwf("cannot load image with wrong team ID in process using Library Validation");
else
- dyld::log("dyld: Registered code signature for %s\n", this->getPath());
+ dyld::throwf("mmap() errno=%d validating first page of '%s'", errno, getInstallPath());
}
+ if ( memcmp(fdata, fileData, lenFileData) != 0 )
+ dyld::throwf("mmap() page compare failed for '%s'", getInstallPath());
+ munmap(fdata, lenFileData);
}
}
switch ( cmd->cmd ) {
case LC_VERSION_MIN_MACOSX:
case LC_VERSION_MIN_IPHONEOS:
+ case LC_VERSION_MIN_TVOS:
+ case LC_VERSION_MIN_WATCHOS:
versCmd = (version_min_command*)cmd;
return versCmd->sdk;
}
switch ( cmd->cmd ) {
case LC_VERSION_MIN_MACOSX:
case LC_VERSION_MIN_IPHONEOS:
+ case LC_VERSION_MIN_TVOS:
+ case LC_VERSION_MIN_WATCHOS:
versCmd = (version_min_command*)cmd;
return versCmd->version;
}
const char* pathToAdd = NULL;
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.processIsRestricted && (context.mainExecutable == this) ) {
+ if ( context.processIsRestricted && !context.processRequiresLibraryValidation && (context.mainExecutable == this) ) {
dyld::warn("LC_RPATH %s in %s being ignored in restricted program because of @loader_path\n", path, this->getPath());
break;
}
}
}
else if ( (strncmp(path, "@executable_path", 16) == 0) && ((path[16] == '/') || (path[16] == '\0')) ) {
- if ( context.processIsRestricted ) {
+ if ( context.processIsRestricted && !context.processRequiresLibraryValidation ) {
dyld::warn("LC_RPATH %s in %s being ignored in restricted program because of @executable_path\n", path, this->getPath());
break;
}
}
}
}
- else if ( (path[0] != '/') && context.processIsRestricted ) {
+ else if ( (path[0] != '/') && context.processIsRestricted && !context.processRequiresLibraryValidation ) {
dyld::warn("LC_RPATH %s in %s being ignored in restricted program because it is a relative path\n", path, this->getPath());
break;
}
for (uint32_t i = 0; i < cmd_count; ++i) {
if ( cmd->cmd == LC_SEGMENT_COMMAND ) {
const struct macho_segment_command* seg = (struct macho_segment_command*)cmd;
- if ( strcmp(seg->segname, "__DATA") == 0 ) {
+ if ( strncmp(seg->segname, "__DATA", 6) == 0 ) {
const struct macho_section* const sectionsStart = (struct macho_section*)((char*)seg + sizeof(struct macho_segment_command));
const struct macho_section* const sectionsEnd = §ionsStart[seg->nsects];
for (const struct macho_section* sect=sectionsStart; sect < sectionsEnd; ++sect) {
if ( strcmp(sect->sectname, "__dyld" ) == 0 ) {
struct DATAdyld* dd = (struct DATAdyld*)(sect->addr + fSlide);
- #if !__arm64__
+ #if !__arm64__ && !__ARM_ARCH_7K__
if ( sect->size > offsetof(DATAdyld, dyldLazyBinder) ) {
if ( dd->dyldLazyBinder != (void*)&stub_binding_helper )
dd->dyldLazyBinder = (void*)&stub_binding_helper;
projects / apple / dyld.git / blobdiff