#include "dyld_images.h"
#include "dyld_priv.h"
+// this was in dyld_priv.h but it is no longer exported
+extern "C" {
+ const struct dyld_all_image_infos* _dyld_get_all_image_infos();
+}
+
+namespace {
+
+void withRemoteBuffer(task_t task, vm_address_t remote_address, size_t remote_size, bool allow_truncation, kern_return_t *kr, void (^block)(void *buffer, size_t size)) {
+ kern_return_t r = KERN_SUCCESS;
+ mach_vm_address_t local_address = 0;
+ mach_vm_address_t local_size = remote_size;
+ while (1) {
+ vm_prot_t cur_protection, max_protection;
+ r = mach_vm_remap(mach_task_self(),
+ &local_address,
+ local_size,
+ 0, // mask
+ VM_FLAGS_ANYWHERE | VM_FLAGS_RETURN_DATA_ADDR | VM_FLAGS_RESILIENT_CODESIGN,
+ task,
+ remote_address,
+ TRUE, // Copy semantics: changes to this memory by the target process will not be visible in this process
+ &cur_protection,
+ &max_protection,
+ VM_INHERIT_DEFAULT);
+ //Do this here to allow chaining of multiple embedded blocks with a single error out;
+ if (kr != NULL) {
+ *kr = r;
+ }
+ if (r == KERN_SUCCESS) {
+ // We got someting, call the block and then exit
+ block(reinterpret_cast<void *>(local_address), local_size);
+ vm_deallocate(mach_task_self(), local_address, local_size);
+ break;
+ }
+ if (!allow_truncation) {
+ break;
+ }
+ // We did not get something, but we are allowed to truncate and try again
+ uint64_t trunc_size = ((remote_address + local_size - 1) & PAGE_MASK) + 1;
+ if (local_size <= trunc_size) {
+ //Even if we truncate it will be in the same page, time to accept defeat
+ break;
+ } else {
+ local_size -= trunc_size;
+ }
+ }
+}
+
+template<typename T>
+void withRemoteObject(task_t task, vm_address_t remote_address, kern_return_t *kr, void (^block)(T t))
+{
+ withRemoteBuffer(task, remote_address, sizeof(T), false, kr, ^(void *buffer, size_t size) {
+ block(*reinterpret_cast<T *>(buffer));
+ });
+}
+};
//
// Opaque object returned by _dyld_process_info_create()
bool invalid() { return ((char*)_stringRevBumpPtr < (char*)_curSegment); }
const char* copyPath(task_t task, uint64_t pathAddr, kern_return_t* kr);
- const char* addString(const char*);
+ const char* addString(const char*, size_t);
const char* copySegmentName(const char*);
void addInfoFromLoadCommands(const mach_header* mh, uint64_t addressInTask, size_t size);
{
// figure out how many path strings will need to be copied and their size
const dyld_all_image_infos* myInfo = _dyld_get_all_image_infos();
- bool sameCacheAsThisProcess = ((memcmp(myInfo->sharedCacheUUID, allImageInfo.sharedCacheUUID, 16) == 0) && (myInfo->sharedCacheSlide == allImageInfo.sharedCacheSlide));
+ bool sameCacheAsThisProcess = !allImageInfo.processDetachedFromSharedRegion
+ && !myInfo->processDetachedFromSharedRegion
+ && ((memcmp(myInfo->sharedCacheUUID, allImageInfo.sharedCacheUUID, 16) == 0)
+ && (myInfo->sharedCacheSlide == allImageInfo.sharedCacheSlide));
unsigned countOfPathsNeedingCopying = 0;
if ( sameCacheAsThisProcess ) {
for (int i=0; i < allImageInfo.infoArrayCount; ++i) {
goto fail;
}
}
-
+
// fill in info for each image
for (uint32_t i=0; i < allImageInfo.infoArrayCount; ++i) {
if ( kern_return_t r = obj->addImage(task, sameCacheAsThisProcess, imageArray[i].imageLoadAddress, imageArray[i].imageFilePath, NULL) ) {
return NULL;
}
- unsigned imageCount = 0; // main executable and dyld
- uint64_t mainExecutableAddress = 0;
- uint64_t dyldAddress = 0;
+ __block unsigned imageCount = 0; // main executable and dyld
+ __block uint64_t mainExecutableAddress = 0;
+ __block uint64_t dyldAddress = 0;
char dyldPathBuffer[PATH_MAX+1];
char mainExecutablePathBuffer[PATH_MAX+1];
+ __block char * dyldPath = &dyldPathBuffer[0];
+ __block char * mainExecutablePath = &mainExecutablePathBuffer[0];
mach_vm_size_t size;
for (mach_vm_address_t address = 0; ; address += size) {
vm_region_basic_info_data_64_t info;
(vm_region_info_t)&info, &infoCount, &objectName);
if ( result != KERN_SUCCESS )
break;
- if ( info.protection == (VM_PROT_READ|VM_PROT_EXECUTE) ) {
+ if ( info.protection != (VM_PROT_READ|VM_PROT_EXECUTE) )
+ continue;
// read start of vm region to verify it is a mach header
- mach_vm_size_t readSize = sizeof(mach_header_64);
- mach_header_64 mhBuffer;
- if ( mach_vm_read_overwrite(task, address, sizeof(mach_header_64), (vm_address_t)&mhBuffer, &readSize) != KERN_SUCCESS )
- continue;
- if ( (mhBuffer.magic != MH_MAGIC) && (mhBuffer.magic != MH_MAGIC_64) )
- continue;
- // now know the region is the start of a mach-o file
- if ( mhBuffer.filetype == MH_EXECUTE ) {
- mainExecutableAddress = address;
- int len = proc_regionfilename(pid, mainExecutableAddress, mainExecutablePathBuffer, PATH_MAX);
- if ( len != 0 )
- mainExecutablePathBuffer[len] = '\0';
- ++imageCount;
- }
- else if ( mhBuffer.filetype == MH_DYLINKER ) {
- dyldAddress = address;
- int len = proc_regionfilename(pid, dyldAddress, dyldPathBuffer, PATH_MAX);
- if ( len != 0 )
- dyldPathBuffer[len] = '\0';
- ++imageCount;
- }
+ withRemoteObject(task, address, NULL, ^(mach_header_64 mhBuffer){
+ if ( (mhBuffer.magic != MH_MAGIC) && (mhBuffer.magic != MH_MAGIC_64) )
+ return;
+ // now know the region is the start of a mach-o file
+ if ( mhBuffer.filetype == MH_EXECUTE ) {
+ mainExecutableAddress = address;
+ int len = proc_regionfilename(pid, mainExecutableAddress, mainExecutablePath, PATH_MAX);
+ if ( len != 0 ) {
+ mainExecutablePath[len] = '\0';
+ }
+ ++imageCount;
+ }
+ else if ( mhBuffer.filetype == MH_DYLINKER ) {
+ dyldAddress = address;
+ int len = proc_regionfilename(pid, dyldAddress, dyldPath, PATH_MAX);
+ if ( len != 0 ) {
+ dyldPath[len] = '\0';
+ }
+ ++imageCount;
+ }
+ });
//fprintf(stderr, "vm region: addr=0x%llX, size=0x%llX, prot=0x%X\n", (uint64_t)address, (uint64_t)size, info.protection);
- }
}
//fprintf(stderr, "dyld: addr=0x%llX, path=%s\n", dyldAddress, dyldPathBuffer);
//fprintf(stderr, "app: addr=0x%llX, path=%s\n", mainExecutableAddress, mainExecutablePathBuffer);
// fill in info for dyld
if ( dyldAddress != 0 ) {
- if ( kern_return_t r = obj->addDyldImage(task, dyldAddress, 0, dyldPathBuffer) ) {
+ if ( kern_return_t r = obj->addDyldImage(task, dyldAddress, 0, dyldPath) ) {
if ( kr != NULL )
*kr = r;
free(obj);
// fill in info for each image
if ( mainExecutableAddress != 0 ) {
- if ( kern_return_t r = obj->addImage(task, false, mainExecutableAddress, 0, mainExecutablePathBuffer) ) {
+ if ( kern_return_t r = obj->addImage(task, false, mainExecutableAddress, 0, mainExecutablePath) ) {
if ( kr != NULL )
*kr = r;
free(obj);
-const char* dyld_process_info_base::addString(const char* str)
+const char* dyld_process_info_base::addString(const char* str, size_t maxlen)
{
- size_t len = strlen(str) + 1;
+ size_t len = strnlen(str, maxlen) + 1;
_stringRevBumpPtr -= len;
- strcpy(_stringRevBumpPtr, str);
+ strlcpy(_stringRevBumpPtr, str, len);
return _stringRevBumpPtr;
}
const char* dyld_process_info_base::copyPath(task_t task, uint64_t stringAddressInTask, kern_return_t* kr)
{
- char temp[PATH_MAX+8]; // +8 is to allow '\0' at temp[PATH_MAX]
- mach_vm_size_t readSize = PATH_MAX;
- if ( ((stringAddressInTask & 0xFFF) + PATH_MAX) < 4096 ) {
- // string fits within page, only one vm_read needed
- if ( kern_return_t r = mach_vm_read_overwrite(task, stringAddressInTask, PATH_MAX, (vm_address_t)&temp, &readSize) ) {
- if ( kr != NULL )
- *kr = r;
- return NULL;
- }
- }
- else {
- // string may cross page boundary, split into two reads
- size_t firstLen = 4096 - (stringAddressInTask & 0xFFF);
- readSize = firstLen;
- if ( kern_return_t r = mach_vm_read_overwrite(task, stringAddressInTask, firstLen, (vm_address_t)&temp, &readSize) ) {
- if ( kr != NULL )
- *kr = r;
- return NULL;
- }
- temp[firstLen] = '\0';
- if ( strlen(temp) >= firstLen ) {
- readSize = PATH_MAX-firstLen;
- if ( kern_return_t r = mach_vm_read_overwrite(task, stringAddressInTask+firstLen, PATH_MAX-firstLen, (vm_address_t)&temp+firstLen, &readSize) ) {
- if ( kr != NULL )
- *kr = r;
- return NULL;
- temp[PATH_MAX] = '\0'; // truncate any string that is too long
- }
- }
- }
- if ( kr != NULL )
- *kr = KERN_SUCCESS;
- return addString(temp);
-}
+ __block const char* retval = NULL;
+ withRemoteBuffer(task, stringAddressInTask, PATH_MAX, true, kr, ^(void *buffer, size_t size) {
+ retval = addString(static_cast<const char *>(buffer), size);
+ });
+ return retval;
+}
kern_return_t dyld_process_info_base::addImage(task_t task, bool sameCacheAsThisProcess, uint64_t imageAddress, uint64_t imagePath, const char* imagePathLocal)
{
_curImage->loadAddress = imageAddress;
_curImage->segmentStartIndex = _curSegmentIndex;
if ( imagePathLocal != NULL ) {
- _curImage->path = addString(imagePathLocal);
+ _curImage->path = addString(imagePathLocal, PATH_MAX);
}
else if ( sameCacheAsThisProcess && inCache(imagePath) ) {
_curImage->path = (const char*)imagePath;
addInfoFromLoadCommands((mach_header*)imageAddress, imageAddress, 32*1024);
}
else {
- mach_vm_size_t readSize = sizeof(mach_header_64);
- mach_header_64 mhBuffer;
- if ( kern_return_t r = mach_vm_read_overwrite(task, imageAddress, sizeof(mach_header_64), (vm_address_t)&mhBuffer, &readSize) ) {
- return r;
- }
- size_t headerPagesSize = (sizeof(mach_header_64) + mhBuffer.sizeofcmds + 4095) & (-4096);
- vm_address_t localCopyBuffer;
- unsigned int localCopyBufferSize;
- if ( kern_return_t r = mach_vm_read(task, imageAddress, headerPagesSize, &localCopyBuffer, &localCopyBufferSize) ) {
- return r;
+ __block kern_return_t kr = KERN_SUCCESS;
+ withRemoteObject(task, imageAddress, &kr, ^(mach_header_64 mhBuffer) {
+ size_t headerPagesSize = sizeof(mach_header_64) + mhBuffer.sizeofcmds;
+ withRemoteBuffer(task, imageAddress, headerPagesSize, false, &kr, ^(void * buffer, size_t size) {
+ addInfoFromLoadCommands((mach_header*)buffer, imageAddress, size);
+ });
+ });
+ if (kr != KERN_SUCCESS) {
+ return kr;
}
- addInfoFromLoadCommands((mach_header*)localCopyBuffer, imageAddress, localCopyBufferSize);
- vm_deallocate(mach_task_self(), localCopyBuffer, localCopyBufferSize);
}
_curImage->segmentsCount = _curSegmentIndex - _curImage->segmentStartIndex;
_curImage++;
kern_return_t dyld_process_info_base::addDyldImage(task_t task, uint64_t dyldAddress, uint64_t dyldPathAddress, const char* localPath)
{
- kern_return_t kr;
+ __block kern_return_t kr = KERN_SUCCESS;
_curImage->loadAddress = dyldAddress;
_curImage->segmentStartIndex = _curSegmentIndex;
if ( localPath != NULL ) {
- _curImage->path = addString(localPath);
+ _curImage->path = addString(localPath, PATH_MAX);
}
else {
_curImage->path = copyPath(task, dyldPathAddress, &kr);
return kr;
}
- mach_vm_size_t readSize = sizeof(mach_header_64);
- mach_header_64 mhBuffer;
- if ( kern_return_t r = mach_vm_read_overwrite(task, dyldAddress, sizeof(mach_header_64), (vm_address_t)&mhBuffer, &readSize) ) {
- return r;
- }
- size_t headerPagesSize = (sizeof(mach_header_64) + mhBuffer.sizeofcmds + 4095) & (-4096);
- vm_address_t localCopyBuffer;
- unsigned int localCopyBufferSize;
- if ( kern_return_t r = mach_vm_read(task, dyldAddress, headerPagesSize, &localCopyBuffer, &localCopyBufferSize) ) {
- return r;
+ withRemoteObject(task, dyldAddress, &kr, ^(mach_header_64 mhBuffer) {
+ size_t headerPagesSize = sizeof(mach_header_64) + mhBuffer.sizeofcmds;
+ withRemoteBuffer(task, dyldAddress, headerPagesSize, false, &kr, ^(void * buffer, size_t size) {
+ addInfoFromLoadCommands((mach_header*)buffer, dyldAddress, size);
+ });
+ });
+ if (kr != KERN_SUCCESS) {
+ return kr;
}
- addInfoFromLoadCommands((mach_header*)localCopyBuffer, dyldAddress, localCopyBufferSize);
- vm_deallocate(mach_task_self(), localCopyBuffer, localCopyBufferSize);
+
_curImage->segmentsCount = _curSegmentIndex - _curImage->segmentStartIndex;
_curImage++;
return KERN_SUCCESS;
startCmds = (load_command*)((char *)mh + sizeof(mach_header));
else
return; // not a mach-o file, or wrong endianness
-
+
const load_command* const cmdsEnd = (load_command*)((char*)startCmds + mh->sizeofcmds);
const load_command* cmd = startCmds;
for(uint32_t i = 0; i < mh->ncmds; ++i) {
return *s;
}
// copy custom segment names into string pool
- return addString(name);
+ return addString(name, 16);
}
void dyld_process_info_base::forEachImage(void (^callback)(uint64_t machHeaderAddress, const uuid_t uuid, const char* path)) const
projects / apple / dyld.git / blobdiff