+/*********************************************************************
+*********************************************************************/
+void
+KLDBootstrap::readPrelinkedExtensions(
+ kernel_section_t * prelinkInfoSect)
+{
+ OSArray * infoDictArray = NULL; // do not release
+ OSObject * parsedXML = NULL; // must release
+ OSDictionary * prelinkInfoDict = NULL; // do not release
+ OSString * errorString = NULL; // must release
+ OSKext * theKernel = NULL; // must release
+
+ kernel_segment_command_t * prelinkTextSegment = NULL; // see code
+ kernel_segment_command_t * prelinkInfoSegment = NULL; // see code
+
+ /* We make some copies of data, but if anything fails we're basically
+ * going to fail the boot, so these won't be cleaned up on error.
+ */
+ void * prelinkData = NULL; // see code
+ vm_size_t prelinkLength = 0;
+
+#if !__LP64__ && !defined(__arm__)
+ vm_map_offset_t prelinkDataMapOffset = 0;
+ void * prelinkCopy = NULL; // see code
+ kern_return_t mem_result = KERN_SUCCESS;
+#endif
+
+ OSDictionary * infoDict = NULL; // do not release
+
+ IORegistryEntry * registryRoot = NULL; // do not release
+ OSNumber * prelinkCountObj = NULL; // must release
+
+ u_int i = 0;
+
+ OSKextLog(/* kext */ NULL,
+ kOSKextLogProgressLevel |
+ kOSKextLogDirectoryScanFlag | kOSKextLogArchiveFlag,
+ "Starting from prelinked kernel.");
+
+ prelinkTextSegment = getsegbyname(kPrelinkTextSegment);
+ if (!prelinkTextSegment) {
+ OSKextLog(/* kext */ NULL,
+ kOSKextLogErrorLevel |
+ kOSKextLogDirectoryScanFlag | kOSKextLogArchiveFlag,
+ "Can't find prelinked kexts' text segment.");
+ goto finish;
+ }
+
+ prelinkData = (void *) prelinkTextSegment->vmaddr;
+ prelinkLength = prelinkTextSegment->vmsize;
+
+#if !__LP64__ && !__arm__
+ /* XXX: arm's pmap implementation doesn't seem to let us do this */
+
+ /* To enable paging and write/execute protections on the kext
+ * executables, we need to copy them out of the booter-created
+ * memory, reallocate that space with VM, then prelinkCopy them back in.
+ * This isn't necessary on LP64 because kexts have their own VM
+ * region on that architecture model.
+ */
+
+ mem_result = kmem_alloc(kernel_map, (vm_offset_t *)&prelinkCopy,
+ prelinkLength);
+ if (mem_result != KERN_SUCCESS) {
+ OSKextLog(/* kext */ NULL,
+ kOSKextLogErrorLevel |
+ kOSKextLogGeneralFlag | kOSKextLogArchiveFlag,
+ "Can't copy prelinked kexts' text for VM reassign.");
+ goto finish;
+ }
+
+ /* Copy it out.
+ */
+ memcpy(prelinkCopy, prelinkData, prelinkLength);
+
+ /* Dump the booter memory.
+ */
+ ml_static_mfree((vm_offset_t)prelinkData, prelinkLength);
+
+ /* Set up the VM region.
+ */
+ prelinkDataMapOffset = (vm_map_offset_t)(uintptr_t)prelinkData;
+ mem_result = vm_map_enter_mem_object(
+ kernel_map,
+ &prelinkDataMapOffset,
+ prelinkLength, /* mask */ 0,
+ VM_FLAGS_FIXED | VM_FLAGS_OVERWRITE,
+ (ipc_port_t)NULL,
+ (vm_object_offset_t) 0,
+ /* copy */ FALSE,
+ /* cur_protection */ VM_PROT_ALL,
+ /* max_protection */ VM_PROT_ALL,
+ /* inheritance */ VM_INHERIT_DEFAULT);
+ if ((mem_result != KERN_SUCCESS) ||
+ (prelinkTextSegment->vmaddr != prelinkDataMapOffset))
+ {
+ OSKextLog(/* kext */ NULL,
+ kOSKextLogErrorLevel |
+ kOSKextLogGeneralFlag | kOSKextLogArchiveFlag,
+ "Can't create kexts' text VM entry at 0x%llx, length 0x%x (error 0x%x).",
+ (unsigned long long) prelinkDataMapOffset, prelinkLength, mem_result);
+ goto finish;
+ }
+ prelinkData = (void *)(uintptr_t)prelinkDataMapOffset;
+
+ /* And copy it back.
+ */
+ memcpy(prelinkData, prelinkCopy, prelinkLength);
+
+ kmem_free(kernel_map, (vm_offset_t)prelinkCopy, prelinkLength);
+#endif /* !__LP64__ && !__arm__*/
+
+ /* Unserialize the info dictionary from the prelink info section.
+ */
+ parsedXML = OSUnserializeXML((const char *)prelinkInfoSect->addr,
+ &errorString);
+ if (parsedXML) {
+ prelinkInfoDict = OSDynamicCast(OSDictionary, parsedXML);
+ }
+ if (!prelinkInfoDict) {
+ const char * errorCString = "(unknown error)";
+
+ if (errorString && errorString->getCStringNoCopy()) {
+ errorCString = errorString->getCStringNoCopy();
+ } else if (parsedXML) {
+ errorCString = "not a dictionary";
+ }
+ OSKextLog(/* kext */ NULL, kOSKextLogErrorLevel | kOSKextLogArchiveFlag,
+ "Error unserializing prelink plist: %s.", errorCString);
+ goto finish;
+ }
+
+ infoDictArray = OSDynamicCast(OSArray,
+ prelinkInfoDict->getObject(kPrelinkInfoDictionaryKey));
+ if (!infoDictArray) {
+ OSKextLog(/* kext */ NULL, kOSKextLogErrorLevel | kOSKextLogArchiveFlag,
+ "The prelinked kernel has no kext info dictionaries");
+ goto finish;
+ }
+
+ /* Create OSKext objects for each info dictionary.
+ */
+ for (i = 0; i < infoDictArray->getCount(); ++i) {
+ infoDict = OSDynamicCast(OSDictionary, infoDictArray->getObject(i));
+ if (!infoDict) {
+ OSKextLog(/* kext */ NULL,
+ kOSKextLogErrorLevel |
+ kOSKextLogDirectoryScanFlag | kOSKextLogArchiveFlag,
+ "Can't find info dictionary for prelinked kext #%d.", i);
+ continue;
+ }
+
+ /* Create the kext for the entry, then release it, because the
+ * kext system keeps them around until explicitly removed.
+ * Any creation/registration failures are already logged for us.
+ */
+ OSKext * newKext = OSKext::withPrelinkedInfoDict(infoDict);
+ OSSafeReleaseNULL(newKext);
+ }
+
+ /* Store the number of prelinked kexts in the registry so we can tell
+ * when the system has been started from a prelinked kernel.
+ */
+ registryRoot = IORegistryEntry::getRegistryRoot();
+ assert(registryRoot);
+
+ prelinkCountObj = OSNumber::withNumber(
+ (unsigned long long)infoDictArray->getCount(),
+ 8 * sizeof(uint32_t));
+ assert(prelinkCountObj);
+ if (prelinkCountObj) {
+ registryRoot->setProperty(kOSPrelinkKextCountKey, prelinkCountObj);
+ }
+
+ OSKextLog(/* kext */ NULL,
+ kOSKextLogProgressLevel |
+ kOSKextLogGeneralFlag | kOSKextLogKextBookkeepingFlag |
+ kOSKextLogDirectoryScanFlag | kOSKextLogArchiveFlag,
+ "%u prelinked kexts",
+ infoDictArray->getCount());
+
+#if __LP64__
+ /* On LP64 systems, kexts are copied to their own special VM region
+ * during OSKext init time, so we can free the whole segment now.
+ */
+ ml_static_mfree((vm_offset_t) prelinkData, prelinkLength);
+#endif /* __LP64__ */
+
+ /* Free the prelink info segment, we're done with it.
+ */
+ prelinkInfoSegment = getsegbyname(kPrelinkInfoSegment);
+ if (prelinkInfoSegment) {
+ ml_static_mfree((vm_offset_t)prelinkInfoSegment->vmaddr,
+ (vm_size_t)prelinkInfoSegment->vmsize);
+ }
+
+finish:
+ OSSafeRelease(errorString);
+ OSSafeRelease(parsedXML);
+ OSSafeRelease(theKernel);
+ OSSafeRelease(prelinkCountObj);
+ return;
+}
projects / apple / xnu.git / blobdiff