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OSKext.cpp
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OSKext.cpp
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/*
* Copyright (c) 2008-2009 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. The rights granted to you under the License
* may not be used to create, or enable the creation or redistribution of,
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
*
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
extern "C" {
#include <kern/clock.h>
#include <kern/host.h>
#include <kern/kext_alloc.h>
#include <kextd/kextd_mach.h>
#include <libkern/kernel_mach_header.h>
#include <libkern/kext_panic_report.h>
#include <libkern/kext_request_keys.h>
#include <libkern/mkext.h>
#include <libkern/prelink.h>
#include <libkern/version.h>
#include <libkern/zlib.h>
#include <mach/mach_vm.h>
#include <sys/sysctl.h>
};
#include <libkern/OSKextLibPrivate.h>
#include <libkern/c++/OSKext.h>
#include <libkern/c++/OSLib.h>
#include <IOKit/IOLib.h>
#include <IOKit/IOCatalogue.h>
#include <IOKit/IORegistryEntry.h>
#include <IOKit/IOService.h>
#if PRAGMA_MARK
#pragma mark External & Internal Function Protos
#endif
/*********************************************************************
*********************************************************************/
extern "C" {
// in libkern/OSKextLib.cpp, not in header for a reason.
extern kern_return_t OSKextPingKextd(void);
extern int IODTGetLoaderInfo(const char * key, void ** infoAddr, int * infoSize);
extern void IODTFreeLoaderInfo(const char * key, void * infoAddr, int infoSize);
extern void OSRuntimeUnloadCPPForSegment(kernel_segment_command_t * segment);
extern void OSRuntimeUnloadCPP(kmod_info_t * ki, void * data);
extern ppnum_t pmap_find_phys(pmap_t pmap, addr64_t va); /* osfmk/machine/pmap.h */
}
static OSReturn _OSKextCreateRequest(
const char * predicate,
OSDictionary ** requestP);
static OSString * _OSKextGetRequestPredicate(OSDictionary * requestDict);
static OSObject * _OSKextGetRequestArgument(
OSDictionary * requestDict,
const char * argName);
static bool _OSKextSetRequestArgument(
OSDictionary * requestDict,
const char * argName,
OSObject * value);
static void * _OSKextExtractPointer(OSData * wrapper);
static OSReturn _OSDictionarySetCStringValue(
OSDictionary * dict,
const char * key,
const char * value);
#if CONFIG_MACF_KEXT
static void * MACFCopyModuleDataForKext(
OSKext * theKext,
mach_msg_type_number_t * datalen);
#endif /* CONFIG_MACF_KEXT */
#if PRAGMA_MARK
#pragma mark Constants & Macros
#endif
/*********************************************************************
* Constants & Macros
*********************************************************************/
/* A typical Snow Leopard system has a bit under 120 kexts loaded.
* Use this number to create containers.
*/
#define kOSKextTypicalLoadCount (120)
/* Any kext will have at least 1 retain for the internal lookup-by-ID dict.
* A loaded kext will no dependents or external retains will have 2 retains.
*/
#define kOSKextMinRetainCount (1)
#define kOSKextMinLoadedRetainCount (2)
/**********
* Strings and substrings used in dependency resolution.
*/
#define APPLE_KEXT_PREFIX "com.apple."
#define KERNEL_LIB "com.apple.kernel"
#define PRIVATE_KPI "com.apple.kpi.private"
/* Version for compatbility pseudokexts (com.apple.kernel.*),
* compatible back to v6.0.
*/
#define KERNEL6_LIB "com.apple.kernel.6.0"
#define KERNEL6_VERSION "7.9.9"
#define KERNEL_LIB_PREFIX "com.apple.kernel."
#define KPI_LIB_PREFIX "com.apple.kpi."
#define STRING_HAS_PREFIX(s, p) (strncmp((s), (p), strlen(p)) == 0)
/*********************************************************************
* infoDict keys for internally-stored data. Saves on ivar slots for
* objects we don't keep around past boot time or during active load.
*********************************************************************/
/* A usable, uncompressed file is stored under this key.
*/
#define _kOSKextExecutableKey "_OSKextExecutable"
/* An indirect reference to the executable file from an mkext
* is stored under this key.
*/
#define _kOSKextMkextExecutableReferenceKey "_OSKextMkextExecutableReference"
/* If the file is contained in a larger buffer laid down by the booter or
* sent from user space, the OSKext stores that OSData under this key so that
* references are properly tracked. This is always an mkext, right now.
*/
#define _kOSKextExecutableExternalDataKey "_OSKextExecutableExternalData"
#if PRAGMA_MARK
#pragma mark Typedefs
#endif
/*********************************************************************
* Typedefs
*********************************************************************/
/*********************************************************************
* MkextEntryRef describes the contents of an OSData object
* referencing a file entry from an mkext so that we can uncompress
* (if necessary) and extract it on demand.
*
* It contains the mkextVersion in case we ever wind up supporting
* multiple mkext formats. Mkext format 1 is officially retired as of
* Snow Leopard.
*********************************************************************/
typedef struct MkextEntryRef {
mkext_basic_header * mkext; // beginning of whole mkext file
void * fileinfo; // mkext2_file_entry or equiv; see mkext.h
} MkextEntryRef;
#if PRAGMA_MARK
#pragma mark Global and static Module Variables
#endif
/*********************************************************************
* Global & static variables, used to keep track of kexts.
*********************************************************************/
static bool sPrelinkBoot = false;
static bool sSafeBoot = false;
/******
* sKextLock is the principal lock for OSKext. Below, there is also an
* sKextInnerLock used to guard access to data accessed on in-calls from
* IOService. This 2nd lock is required to prevent a deadlock
* with IOService calling back into OSKext::considerUnloads()
* on a separate thread during a kext load operation.
*/
static IORecursiveLock * sKextLock = NULL;
static OSDictionary * sKextsByID = NULL;
static OSArray * sLoadedKexts = NULL;
// Requests to kextd waiting to be picked up.
static OSArray * sKernelRequests = NULL;
// Identifier of kext load requests in sKernelRequests
static OSSet * sPostedKextLoadIdentifiers = NULL;
static OSArray * sRequestCallbackRecords = NULL;
// Identifiers of all kexts ever requested in kernel; used for prelinked kernel
static OSSet * sAllKextLoadIdentifiers = NULL;
static KXLDContext * sKxldContext = NULL;
static uint32_t sNextLoadTag = 0;
static uint32_t sNextRequestTag = 0;
static bool sUserLoadsActive = false;
static bool sKextdActive = false;
static bool sDeferredLoadSucceeded = false;
static bool sConsiderUnloadsExecuted = false;
static bool sKernelRequestsEnabled = true;
static bool sLoadEnabled = true;
static bool sUnloadEnabled = true;
/*********************************************************************
* Stuff for the OSKext representing the kernel itself.
**********/
static OSKext * sKernelKext = NULL;
/* Set up a fake kmod_info struct for the kernel.
* It's used in OSRuntime.cpp to call OSRuntimeInitializeCPP()
* before OSKext is initialized; that call only needs the name
* and address to be set correctly.
*
* We don't do much else with the kerne's kmod_info; we never
* put it into the kmod list, never adjust the reference count,
* and never have kernel components reference it.
* For that matter, we don't do much with kmod_info structs
* at all anymore! We just keep them filled in for gdb and
* binary compability.
*/
kmod_info_t g_kernel_kmod_info = {
/* next */ 0,
/* info_version */ KMOD_INFO_VERSION,
/* id */ 0, // loadTag: kernel is always 0
/* name */ kOSKextKernelIdentifier, // bundle identifier
/* version */ "0", // filled in in OSKext::initialize()
/* reference_count */ -1, // never adjusted; kernel never unloads
/* reference_list */ NULL,
/* address */ (vm_address_t)&_mh_execute_header,
/* size */ 0, // filled in in OSKext::initialize()
/* hdr_size */ 0,
/* start */ 0,
/* stop */ 0
};
extern "C" {
// symbol 'kmod' referenced in: model_dep.c, db_trace.c, symbols.c, db_low_trace.c,
// dtrace.c, dtrace_glue.h, OSKext.cpp, locore.s, lowmem_vectors.s,
// misc_protos.h, db_low_trace.c, kgmacros
// 'kmod' is a holdover from the old kmod system, we can't rename it.
kmod_info_t * kmod = NULL;
#define KEXT_PANICLIST_SIZE (2 * PAGE_SIZE)
static char * unloaded_kext_paniclist = NULL;
static uint32_t unloaded_kext_paniclist_size = 0;
static uint32_t unloaded_kext_paniclist_length = 0;
AbsoluteTime last_loaded_timestamp;
static char * loaded_kext_paniclist = NULL;
static uint32_t loaded_kext_paniclist_size = 0;
static uint32_t loaded_kext_paniclist_length = 0;
AbsoluteTime last_unloaded_timestamp;
static void * last_unloaded_address = NULL;
#if __LP64__
static uint64_t last_unloaded_size = 0;
#else
static uint32_t last_unloaded_size = 0;
#endif /* __LP64__ */
};
/*********************************************************************
* Because we can start IOService matching from OSKext (via IOCatalogue)
* and IOService can call into OSKext, there is potential for cross-lock
* contention, so OSKext needs two locks. The regular sKextLock above
* guards most OSKext class/static variables, and sKextInnerLock guards
* variables that can be accessed on in-calls from IOService, currently:
*
* * OSKext::considerUnloads()
*
* Note that sConsiderUnloadsExecuted above belongs to sKextLock!
*
* When both sKextLock and sKextInnerLock need to be taken,
* always lock sKextLock first and unlock it second. Never take both
* locks in an entry point to OSKext; if you need to do so, you must
* spawn an independent thread to avoid potential deadlocks for threads
* calling into OSKext.
*
* All static variables from here to the closing comment block fall
* under sKextInnerLock.
**********/
static IORecursiveLock * sKextInnerLock = NULL;
static bool sAutounloadEnabled = true;
static bool sConsiderUnloadsCalled = false;
static bool sConsiderUnloadsPending = false;
static unsigned int sConsiderUnloadDelay = 60; // seconds
static thread_call_t sUnloadCallout = 0;
static thread_call_t sDestroyLinkContextThread = 0; // one-shot, one-at-a-time thread
static bool sSystemSleep = false; // true when system going to sleep
static const OSKextLogSpec kDefaultKernelLogFilter = kOSKextLogBasicLevel |
kOSKextLogVerboseFlagsMask;
static OSKextLogSpec sKernelLogFilter = kDefaultKernelLogFilter;
static bool sBootArgLogFilterFound = false;
SYSCTL_INT(_debug, OID_AUTO, kextlog, CTLFLAG_RW, &sKernelLogFilter,
sKernelLogFilter, "kernel kext logging");
static OSKextLogSpec sUserSpaceKextLogFilter = kOSKextLogSilentFilter;
static OSArray * sUserSpaceLogSpecArray = NULL;
static OSArray * sUserSpaceLogMessageArray = NULL;
/*********
* End scope for sKextInnerLock-protected variables.
*********************************************************************/
#if PRAGMA_MARK
#pragma mark OSData callbacks (need to move to OSData)
#endif
/*********************************************************************
* C functions used for callbacks.
*********************************************************************/
extern "C" {
void osdata_kmem_free(void * ptr, unsigned int length) {
kmem_free(kernel_map, (vm_address_t)ptr, length);
return;
}
void osdata_phys_free(void * ptr, unsigned int length) {
ml_static_mfree((vm_offset_t)ptr, length);
return;
}
void osdata_vm_deallocate(void * ptr, unsigned int length)
{
(void)vm_deallocate(kernel_map, (vm_offset_t)ptr, length);
return;
}
};
#if PRAGMA_MARK
#pragma mark KXLD Allocation Callback
#endif
/*********************************************************************
* KXLD Allocation Callback
*********************************************************************/
kxld_addr_t
kern_allocate(
u_long size,
KXLDAllocateFlags * flags,
void * user_data)
{
vm_address_t result = 0; // returned
kern_return_t mach_result = KERN_FAILURE;
bool success = false;
OSKext * theKext = (OSKext *)user_data;
u_long roundSize = round_page(size);
OSData * linkBuffer = NULL; // must release
mach_result = kext_alloc(&result, roundSize, /* fixed */ FALSE);
if (mach_result != KERN_SUCCESS) {
OSKextLog(theKext,
kOSKextLogErrorLevel |
kOSKextLogGeneralFlag,
"Can't allocate kernel memory to link %s.",
theKext->getIdentifierCString());
goto finish;
}
/* Create an OSData wrapper for the allocated buffer.
* Note that we do not set a dealloc function on it here.
* We have to call vm_map_unwire() on it in OSKext::unload()
* and an OSData dealloc function can't take all those parameters.
*/
linkBuffer = OSData::withBytesNoCopy((void *)result, roundSize);
if (!linkBuffer) {
OSKextLog(theKext,
kOSKextLogErrorLevel |
kOSKextLogGeneralFlag,
"Can't allocate linked executable wrapper for %s.",
theKext->getIdentifierCString());
goto finish;
}
OSKextLog(theKext,
kOSKextLogProgressLevel |
kOSKextLogLoadFlag | kOSKextLogLinkFlag,
"Allocated link buffer for kext %s at %p (%lu bytes).",
theKext->getIdentifierCString(),
(void *)result, (unsigned long)roundSize);
theKext->setLinkedExecutable(linkBuffer);
*flags = kKxldAllocateWritable;
success = true;
finish:
if (!success && result) {
kext_free(result, roundSize);
result = 0;
}
OSSafeRelease(linkBuffer);
return (kxld_addr_t)result;
}
/*********************************************************************
*********************************************************************/
void
kxld_log_callback(
KXLDLogSubsystem subsystem,
KXLDLogLevel level,
const char * format,
va_list argList,
void * user_data)
{
OSKext *theKext = (OSKext *) user_data;
OSKextLogSpec logSpec = 0;
switch (subsystem) {
case kKxldLogLinking:
logSpec |= kOSKextLogLinkFlag;
break;
case kKxldLogPatching:
logSpec |= kOSKextLogPatchFlag;
break;
}
switch (level) {
case kKxldLogExplicit:
logSpec |= kOSKextLogExplicitLevel;
break;
case kKxldLogErr:
logSpec |= kOSKextLogErrorLevel;
break;
case kKxldLogWarn:
logSpec |= kOSKextLogWarningLevel;
break;
case kKxldLogBasic:
logSpec |= kOSKextLogProgressLevel;
break;
case kKxldLogDetail:
logSpec |= kOSKextLogDetailLevel;
break;
case kKxldLogDebug:
logSpec |= kOSKextLogDebugLevel;
break;
}
OSKextVLog(theKext, logSpec, format, argList);
}
#if PRAGMA_MARK
#pragma mark Module Config (Startup & Shutdown)
#endif
/*********************************************************************
* Module Config (Class Definition & Class Methods)
*********************************************************************/
#define super OSObject
OSDefineMetaClassAndStructors(OSKext, OSObject)
/*********************************************************************
*********************************************************************/
/* static */
void
OSKext::initialize(void)
{
OSData * kernelExecutable = NULL; // do not release
u_char * kernelStart = NULL; // do not free
size_t kernelLength = 0;
OSString * scratchString = NULL; // must release
IORegistryEntry * registryRoot = NULL; // do not release
OSNumber * kernelCPUType = NULL; // must release
OSNumber * kernelCPUSubtype = NULL; // must release
OSKextLogSpec bootLogFilter = kOSKextLogSilentFilter;
bool setResult = false;
uint64_t * timestamp = 0;
char bootArgBuffer[16]; // for PE_parse_boot_argn w/strings
/* This must be the first thing allocated. Everything else grabs this lock.
*/
sKextLock = IORecursiveLockAlloc();
sKextInnerLock = IORecursiveLockAlloc();
assert(sKextLock);
assert(sKextInnerLock);
sKextsByID = OSDictionary::withCapacity(kOSKextTypicalLoadCount);
sLoadedKexts = OSArray::withCapacity(kOSKextTypicalLoadCount);
sKernelRequests = OSArray::withCapacity(0);
sPostedKextLoadIdentifiers = OSSet::withCapacity(0);
sAllKextLoadIdentifiers = OSSet::withCapacity(kOSKextTypicalLoadCount);
sRequestCallbackRecords = OSArray::withCapacity(0);
assert(sKextsByID && sLoadedKexts && sKernelRequests &&
sPostedKextLoadIdentifiers && sAllKextLoadIdentifiers &&
sRequestCallbackRecords);
/* Read the log flag boot-args and set the log flags.
*/
if (PE_parse_boot_argn("kextlog", &bootLogFilter, sizeof("kextlog=0x00000000 "))) {
sBootArgLogFilterFound = true;
sKernelLogFilter = bootLogFilter;
// log this if any flags are set
OSKextLog(/* kext */ NULL,
kOSKextLogBasicLevel |
kOSKextLogFlagsMask,
"Kernel kext log filter 0x%x per kextlog boot arg.",
(unsigned)sKernelLogFilter);
}
sSafeBoot = PE_parse_boot_argn("-x", bootArgBuffer,
sizeof(bootArgBuffer)) ? true : false;
if (sSafeBoot) {
OSKextLog(/* kext */ NULL,
kOSKextLogWarningLevel |
kOSKextLogGeneralFlag,
"SAFE BOOT DETECTED - "
"only valid OSBundleRequired kexts will be loaded.");
}
/* Set up an OSKext instance to represent the kernel itself.
*/
sKernelKext = new OSKext;
assert(sKernelKext);
kernelStart = (u_char *)&_mh_execute_header;
kernelLength = getlastaddr() - (vm_offset_t)kernelStart;
kernelExecutable = OSData::withBytesNoCopy(
kernelStart, kernelLength);
assert(kernelExecutable);
sKernelKext->loadTag = sNextLoadTag++; // the kernel is load tag 0
sKernelKext->bundleID = OSSymbol::withCString(kOSKextKernelIdentifier);
sKernelKext->version = OSKextParseVersionString(osrelease);
sKernelKext->compatibleVersion = sKernelKext->version;
sKernelKext->linkedExecutable = kernelExecutable;
// linkState will be set first time we do a link
sKernelKext->flags.hasAllDependencies = 1;
sKernelKext->flags.kernelComponent = 1;
sKernelKext->flags.prelinked = 0;
sKernelKext->flags.loaded = 1;
sKernelKext->flags.started = 1;
sKernelKext->flags.CPPInitialized = 0;
sKernelKext->kmod_info = &g_kernel_kmod_info;
strlcpy(g_kernel_kmod_info.version, osrelease,
sizeof(g_kernel_kmod_info.version));
g_kernel_kmod_info.size = kernelLength;
g_kernel_kmod_info.id = sKernelKext->loadTag;
/* Cons up an info dict, so we don't have to have special-case
* checking all over.
*/
sKernelKext->infoDict = OSDictionary::withCapacity(5);
assert(sKernelKext->infoDict);
setResult = sKernelKext->infoDict->setObject(kCFBundleIdentifierKey,
sKernelKext->bundleID);
assert(setResult);
setResult = sKernelKext->infoDict->setObject(kOSKernelResourceKey,
kOSBooleanTrue);
assert(setResult);
scratchString = OSString::withCStringNoCopy(osrelease);
assert(scratchString);
setResult = sKernelKext->infoDict->setObject(kCFBundleVersionKey,
scratchString);
assert(setResult);
OSSafeReleaseNULL(scratchString);
scratchString = OSString::withCStringNoCopy("mach_kernel");
assert(scratchString);
setResult = sKernelKext->infoDict->setObject(kCFBundleNameKey,
scratchString);
assert(setResult);
OSSafeReleaseNULL(scratchString);
/* Add the kernel kext to the bookkeeping dictionaries. Note that
* the kernel kext doesn't have a kmod_info struct. copyInfo()
* gathers info from other places anyhow.
*/
setResult = sKextsByID->setObject(sKernelKext->bundleID, sKernelKext);
assert(setResult);
setResult = sLoadedKexts->setObject(sKernelKext);
assert(setResult);
sKernelKext->release();
registryRoot = IORegistryEntry::getRegistryRoot();
kernelCPUType = OSNumber::withNumber(
(long long unsigned int)_mh_execute_header.cputype,
8 * sizeof(_mh_execute_header.cputype));
kernelCPUSubtype = OSNumber::withNumber(
(long long unsigned int)_mh_execute_header.cpusubtype,
8 * sizeof(_mh_execute_header.cpusubtype));
assert(registryRoot && kernelCPUSubtype && kernelCPUType);
registryRoot->setProperty(kOSKernelCPUTypeKey, kernelCPUType);
registryRoot->setProperty(kOSKernelCPUSubtypeKey, kernelCPUSubtype);
OSSafeRelease(kernelCPUType);
OSSafeRelease(kernelCPUSubtype);
timestamp = __OSAbsoluteTimePtr(&last_loaded_timestamp);
*timestamp = 0;
timestamp = __OSAbsoluteTimePtr(&last_unloaded_timestamp);
*timestamp = 0;
OSKextLog(/* kext */ NULL,
kOSKextLogProgressLevel |
kOSKextLogGeneralFlag,
"Kext system initialized.");
return;
}
/*********************************************************************
* This could be in OSKextLib.cpp but we need to hold a lock
* while removing all the segments and sKextLock will do.
*********************************************************************/
/* static */
OSReturn
OSKext::removeKextBootstrap(void)
{
OSReturn result = kOSReturnError;
static bool alreadyDone = false;
boolean_t keepsyms = FALSE;
const char * dt_kernel_header_name = "Kernel-__HEADER";
const char * dt_kernel_symtab_name = "Kernel-__SYMTAB";
kernel_mach_header_t * dt_mach_header = NULL;
int dt_mach_header_size = 0;
struct symtab_command * dt_symtab = NULL;
int dt_symtab_size = 0;
int dt_result = 0;
kernel_segment_command_t * seg_to_remove = NULL;
#if __ppc__ || __arm__
const char * dt_segment_name = NULL;
void * segment_paddress = NULL;
int segment_size = 0;
#endif
/* This must be the very first thing done by this function.
*/
IORecursiveLockLock(sKextLock);
/* If we already did this, it's a success.
*/
if (alreadyDone) {
result = kOSReturnSuccess;
goto finish;
}
OSKextLog(/* kext */ NULL,
kOSKextLogProgressLevel |
kOSKextLogGeneralFlag,
"Jettisoning kext bootstrap segments.");
PE_parse_boot_argn("keepsyms", &keepsyms, sizeof(keepsyms));
/*****
* Dispose of unnecessary stuff that the booter didn't need to load.
*/
dt_result = IODTGetLoaderInfo(dt_kernel_header_name,
(void **)&dt_mach_header, &dt_mach_header_size);
if (dt_result == 0 && dt_mach_header) {
IODTFreeLoaderInfo(dt_kernel_header_name, (void *)dt_mach_header,
round_page_32(dt_mach_header_size));
}
dt_result = IODTGetLoaderInfo(dt_kernel_symtab_name,
(void **)&dt_symtab, &dt_symtab_size);
if (dt_result == 0 && dt_symtab) {
IODTFreeLoaderInfo(dt_kernel_symtab_name, (void *)dt_symtab,
round_page_32(dt_symtab_size));
}
/*****
* KLD bootstrap segment.
*/
// xxx - should rename KLD segment
seg_to_remove = getsegbyname("__KLD");
if (seg_to_remove) {
OSRuntimeUnloadCPPForSegment(seg_to_remove);
}
#if __ppc__ || __arm__
/* Free the memory that was set up by bootx.
*/
dt_segment_name = "Kernel-__KLD";
if (0 == IODTGetLoaderInfo(dt_segment_name, &segment_paddress, &segment_size)) {
IODTFreeLoaderInfo(dt_segment_name, (void *)segment_paddress,
(int)segment_size);
}
#elif __i386__ || __x86_64__
/* On x86, use the mapping data from the segment load command to
* unload KLD directly.
* This may invalidate any assumptions about "avail_start"
* defining the lower bound for valid physical addresses.
*/
if (seg_to_remove && seg_to_remove->vmaddr && seg_to_remove->vmsize) {
ml_static_mfree(seg_to_remove->vmaddr, seg_to_remove->vmsize);
}
#else
#error arch
#endif
seg_to_remove = NULL;
/*****
* Prelinked kernel's symtab (if there is one).
*/
kernel_section_t * sect;
sect = getsectbyname("__PRELINK", "__symtab");
if (sect && sect->addr && sect->size) {
ml_static_mfree(sect->addr, sect->size);
}
/*****
* Dump the LINKEDIT segment, unless keepsyms is set.
*/
if (!keepsyms) {
seg_to_remove = (kernel_segment_command_t *)getsegbyname("__LINKEDIT");
if (seg_to_remove) {
OSRuntimeUnloadCPPForSegment(seg_to_remove);
}
#if __ppc__ || __arm__
dt_segment_name = "Kernel-__LINKEDIT";
if (0 == IODTGetLoaderInfo(dt_segment_name,
&segment_paddress, &segment_size)) {
IODTFreeLoaderInfo(dt_segment_name, (void *)segment_paddress,
(int)segment_size);
}
#elif __i386__ || __x86_64__
if (seg_to_remove && seg_to_remove->vmaddr && seg_to_remove->vmsize) {
ml_static_mfree(seg_to_remove->vmaddr, seg_to_remove->vmsize);
}
#else
#error arch
#endif
} else {
OSKextLog(/* kext */ NULL,
kOSKextLogBasicLevel |
kOSKextLogGeneralFlag,
"keepsyms boot arg specified; keeping linkedit segment for symbols.");
}
seg_to_remove = NULL;
alreadyDone = true;
result = kOSReturnSuccess;
finish:
/* This must be the very last thing done before returning.
*/
IORecursiveLockUnlock(sKextLock);
return result;
}
/*********************************************************************
*********************************************************************/
void
OSKext::flushNonloadedKexts(
Boolean flushPrelinkedKexts)
{
OSSet * prelinkedKexts = NULL; // must release
OSCollectionIterator * kextIterator = NULL; // must release
OSCollectionIterator * prelinkIterator = NULL; // must release
const OSSymbol * thisID = NULL; // do not release
OSKext * thisKext = NULL; // do not release
uint32_t count, i;
IORecursiveLockLock(sKextLock);
OSKextLog(/* kext */ NULL,
kOSKextLogProgressLevel |
kOSKextLogKextBookkeepingFlag,
"Flushing nonloaded kexts and other unused data.");
OSKext::considerDestroyingLinkContext();
/* If we aren't flushing unused prelinked kexts, we have to put them
* aside while we flush everything else so make a container for them.
*/
if (!flushPrelinkedKexts) {
prelinkedKexts = OSSet::withCapacity(0);
if (!prelinkedKexts) {
goto finish;
}
}
/* Set aside prelinked kexts (in-use or not) and break
* any lingering inter-kext references for nonloaded kexts
* so they have min. retain counts.
*/
kextIterator = OSCollectionIterator::withCollection(sKextsByID);
if (!kextIterator) {
goto finish;
}
while ((thisID = OSDynamicCast(OSSymbol,
kextIterator->getNextObject()))) {
thisKext = OSDynamicCast(OSKext, sKextsByID->getObject(thisID));
if (thisKext) {
if (prelinkedKexts && thisKext->isPrelinked()) {
prelinkedKexts->setObject(thisKext);
}
thisKext->flushDependencies(/* forceIfLoaded */ false);
}
}
/* Dump all the kexts in the ID dictionary; we'll repopulate it shortly.
*/
sKextsByID->flushCollection();
/* Now put the loaded kexts back into the ID dictionary.
*/
count = sLoadedKexts->getCount();
for (i = 0; i < count; i++) {
thisKext = OSDynamicCast(OSKext, sLoadedKexts->getObject(i));
sKextsByID->setObject(thisKext->getIdentifierCString(), thisKext);
}
/* Finally, put back the prelinked kexts if we saved any.
*/
if (prelinkedKexts) {
prelinkIterator = OSCollectionIterator::withCollection(prelinkedKexts);
if (!prelinkIterator) {
goto finish;
}
while ((thisKext = OSDynamicCast(OSKext,
prelinkIterator->getNextObject()))) {
sKextsByID->setObject(thisKext->getIdentifierCString(),
thisKext);
}
}
finish:
IORecursiveLockUnlock(sKextLock);
OSSafeRelease(prelinkedKexts);
OSSafeRelease(kextIterator);
OSSafeRelease(prelinkIterator);
return;
}
/*********************************************************************
*********************************************************************/
/* static */
void
OSKext::setKextdActive(Boolean active)
{
IORecursiveLockLock(sKextLock);
sKextdActive = active;
if (sKernelRequests->getCount()) {
OSKextPingKextd();
}
IORecursiveLockUnlock(sKextLock);
return;
}
/*********************************************************************
*********************************************************************/
/* static */
void
OSKext::setDeferredLoadSucceeded(Boolean succeeded)
{
IORecursiveLockLock(sKextLock);
sDeferredLoadSucceeded = succeeded;
IORecursiveLockUnlock(sKextLock);
return;
}
/*********************************************************************
* Called from IOSystemShutdownNotification.
*********************************************************************/
/* static */
void
OSKext::willShutdown(void)
{
OSReturn checkResult = kOSReturnError;
OSDictionary * exitRequest = NULL; // must release
IORecursiveLockLock(sKextLock);
OSKext::setLoadEnabled(false);
OSKext::setUnloadEnabled(false);
OSKext::setAutounloadsEnabled(false);
OSKext::setKernelRequestsEnabled(false);
OSKextLog(/* kext */ NULL,
kOSKextLogProgressLevel |
kOSKextLogGeneralFlag,
"System shutdown; requesting immediate kextd exit.");
checkResult = _OSKextCreateRequest(kKextRequestPredicateRequestKextdExit,
&exitRequest);
if (checkResult != kOSReturnSuccess) {
goto finish;
}
if (!sKernelRequests->setObject(exitRequest)) {
goto finish;
}
OSKextPingKextd();
finish:
IORecursiveLockUnlock(sKextLock);
OSSafeRelease(exitRequest);
return;
}
/*********************************************************************
*********************************************************************/
/* static */
bool
OSKext::getLoadEnabled(void)
{
bool result;
IORecursiveLockLock(sKextLock);
result = sLoadEnabled;
IORecursiveLockUnlock(sKextLock);
return result;
}
/*********************************************************************
*********************************************************************/
/* static */
bool
OSKext::setLoadEnabled(bool flag)
{
bool result;
IORecursiveLockLock(sKextLock);
result = sLoadEnabled;
sLoadEnabled = (flag ? true : false);
if (sLoadEnabled != result) {
OSKextLog(/* kext */ NULL,
kOSKextLogBasicLevel |
kOSKextLogLoadFlag,
"Kext loading now %sabled.", sLoadEnabled ? "en" : "dis");
}
IORecursiveLockUnlock(sKextLock);
return result;
}
/*********************************************************************
*********************************************************************/
/* static */
bool
OSKext::getUnloadEnabled(void)
{
bool result;
IORecursiveLockLock(sKextLock);
result = sUnloadEnabled;
IORecursiveLockUnlock(sKextLock);
return result;
}
/*********************************************************************
*********************************************************************/
/* static */
bool
OSKext::setUnloadEnabled(bool flag)
{
bool result;
IORecursiveLockLock(sKextLock);
result = sUnloadEnabled;
sUnloadEnabled = (flag ? true : false);
IORecursiveLockUnlock(sKextLock);
if (sUnloadEnabled != result) {
OSKextLog(/* kext */ NULL,
kOSKextLogBasicLevel |
kOSKextLogGeneralFlag | kOSKextLogLoadFlag,
"Kext unloading now %sabled.", sUnloadEnabled ? "en" : "dis");
}