#include "internal.h"
#if TARGET_OS_EMBEDDED || TARGET_IPHONE_SIMULATOR
#undef ASL_LEVEL_INFO
#define ASL_LEVEL_INFO ASL_LEVEL_NOTICE
#endif
#define MALLOC_ABSOLUTE_MAX_SIZE (SIZE_T_MAX - (2 * PAGE_SIZE))
#define USE_SLEEP_RATHER_THAN_ABORT 0
#define MAX_LITE_MALLOCS 100000000
typedef void(malloc_logger_t)(uint32_t type,
uintptr_t arg1,
uintptr_t arg2,
uintptr_t arg3,
uintptr_t result,
uint32_t num_hot_frames_to_skip);
extern malloc_logger_t *__syscall_logger;
static _malloc_lock_s _malloc_lock = _MALLOC_LOCK_INIT;
#define MALLOC_LOCK() _malloc_lock_lock(&_malloc_lock)
#define MALLOC_TRY_LOCK() _malloc_lock_trylock(&_malloc_lock)
#define MALLOC_UNLOCK() _malloc_lock_unlock(&_malloc_lock)
#define MALLOC_REINIT_LOCK() _malloc_lock_init(&_malloc_lock)
int32_t malloc_num_zones = 0;
int32_t malloc_num_zones_allocated = 0;
malloc_zone_t **malloc_zones = 0;
malloc_logger_t *malloc_logger = NULL;
static malloc_zone_t *initial_default_zone = NULL;
unsigned malloc_debug_flags = 0;
boolean_t malloc_tracing_enabled = false;
unsigned malloc_check_start = 0; unsigned malloc_check_counter = 0;
unsigned malloc_check_each = 1000;
int _malloc_no_asl_log = 0;
static int malloc_check_sleep = 100; static int malloc_check_abort = 0;
static int malloc_debug_file = STDERR_FILENO;
static os_once_t _malloc_initialize_pred;
static const char Malloc_Facility[] = "com.apple.Libsystem.malloc";
static int counterAlice = 0, counterBob = 0;
static int *pFRZCounterLive = &counterAlice, *pFRZCounterDrain = &counterBob;
static inline malloc_zone_t *inline_malloc_default_zone(void) __attribute__((always_inline));
#define MALLOC_LOG_TYPE_ALLOCATE stack_logging_type_alloc
#define MALLOC_LOG_TYPE_DEALLOCATE stack_logging_type_dealloc
#define MALLOC_LOG_TYPE_HAS_ZONE stack_logging_flag_zone
#define MALLOC_LOG_TYPE_CLEARED stack_logging_flag_cleared
#define DEFAULT_MALLOC_ZONE_STRING "DefaultMallocZone"
#define DEFAULT_PUREGEABLE_ZONE_STRING "DefaultPurgeableMallocZone"
boolean_t malloc_engaged_nano(void);
#if CONFIG_NANOZONE
boolean_t _malloc_engaged_nano;
#endif
__attribute__((visibility("hidden"))) uint64_t malloc_entropy[2] = {0, 0};
static bool _malloc_entropy_initialized;
void __malloc_init(const char *apple[]);
static int
__entropy_from_kernel(const char *str)
{
unsigned long long val;
char tmp[20], *p;
int idx = 0;
str = strchr(str, '=');
if (str == NULL) {
return 0;
}
str++;
while (str && idx < sizeof(malloc_entropy) / sizeof(malloc_entropy[0])) {
strlcpy(tmp, str, 20);
p = strchr(tmp, ',');
if (p) {
*p = '\0';
}
val = strtoull_l(tmp, NULL, 0, NULL);
malloc_entropy[idx] = (uint64_t)val;
idx++;
if ((str = strchr(str, ',')) != NULL) {
str++;
}
}
return idx;
}
void
__malloc_init(const char *apple[])
{
const char **p;
#if CONFIG_NANOZONE
_malloc_engaged_nano = 0;
for (p = apple; p && *p; p++) {
if (0 == strncmp(*p, "MallocNanoZone=1", strlen("MallocNanoZone=1"))) {
_malloc_engaged_nano = 1;
break;
}
}
#endif
for (p = apple; p && *p; p++) {
if (strstr(*p, "malloc_entropy") == *p) {
int count = __entropy_from_kernel(*p);
bzero((void *)*p, strlen(*p));
if (sizeof(malloc_entropy) / sizeof(malloc_entropy[0]) == count) {
_malloc_entropy_initialized = true;
}
break;
}
}
if (!_malloc_entropy_initialized) {
getentropy((void*)malloc_entropy, sizeof(malloc_entropy));
_malloc_entropy_initialized = true;
}
}
static malloc_zone_t* lite_zone = NULL;
MALLOC_ALWAYS_INLINE
static inline malloc_zone_t *
runtime_default_zone() {
return (lite_zone) ? lite_zone : inline_malloc_default_zone();
}
static size_t
default_zone_size(malloc_zone_t *zone, const void *ptr)
{
zone = runtime_default_zone();
return zone->size(zone, ptr);
}
static void *
default_zone_malloc(malloc_zone_t *zone, size_t size)
{
zone = runtime_default_zone();
return zone->malloc(zone, size);
}
static void *
default_zone_calloc(malloc_zone_t *zone, size_t num_items, size_t size)
{
zone = runtime_default_zone();
return zone->calloc(zone, num_items, size);
}
static void *
default_zone_valloc(malloc_zone_t *zone, size_t size)
{
zone = runtime_default_zone();
return zone->valloc(zone, size);
}
static void
default_zone_free(malloc_zone_t *zone, void *ptr)
{
zone = runtime_default_zone();
return zone->free(zone, ptr);
}
static void *
default_zone_realloc(malloc_zone_t *zone, void *ptr, size_t new_size)
{
zone = runtime_default_zone();
return zone->realloc(zone, ptr, new_size);
}
static void
default_zone_destroy(malloc_zone_t *zone)
{
zone = runtime_default_zone();
return zone->destroy(zone);
}
static unsigned
default_zone_batch_malloc(malloc_zone_t *zone, size_t size, void **results, unsigned count)
{
zone = runtime_default_zone();
return zone->batch_malloc(zone, size, results, count);
}
static void
default_zone_batch_free(malloc_zone_t *zone, void **to_be_freed, unsigned count)
{
zone = runtime_default_zone();
return zone->batch_free(zone, to_be_freed, count);
}
static void *
default_zone_memalign(malloc_zone_t *zone, size_t alignment, size_t size)
{
zone = runtime_default_zone();
return zone->memalign(zone, alignment, size);
}
static void
default_zone_free_definite_size(malloc_zone_t *zone, void *ptr, size_t size)
{
zone = runtime_default_zone();
return zone->free_definite_size(zone, ptr, size);
}
static size_t
default_zone_pressure_relief(malloc_zone_t *zone, size_t goal)
{
zone = runtime_default_zone();
return zone->pressure_relief(zone, goal);
}
static kern_return_t
default_zone_ptr_in_use_enumerator(task_t task,
void *context,
unsigned type_mask,
vm_address_t zone_address,
memory_reader_t reader,
vm_range_recorder_t recorder)
{
malloc_zone_t *zone = runtime_default_zone();
return zone->introspect->enumerator(task, context, type_mask, (vm_address_t) zone, reader, recorder);
}
static size_t
default_zone_good_size(malloc_zone_t *zone, size_t size)
{
zone = runtime_default_zone();
return zone->introspect->good_size(zone, size);
}
static boolean_t
default_zone_check(malloc_zone_t *zone)
{
zone = runtime_default_zone();
return zone->introspect->check(zone);
}
static void
default_zone_print(malloc_zone_t *zone, boolean_t verbose)
{
zone = runtime_default_zone();
return zone->introspect->check(zone);
}
static void
default_zone_log(malloc_zone_t *zone, void *log_address)
{
zone = runtime_default_zone();
return zone->introspect->log(zone, log_address);
}
static void
default_zone_force_lock(malloc_zone_t *zone)
{
zone = runtime_default_zone();
return zone->introspect->force_lock(zone);
}
static void
default_zone_force_unlock(malloc_zone_t *zone)
{
zone = runtime_default_zone();
return zone->introspect->force_unlock(zone);
}
static void
default_zone_statistics(malloc_zone_t *zone, malloc_statistics_t *stats)
{
zone = runtime_default_zone();
return zone->introspect->statistics(zone, stats);
}
static boolean_t
default_zone_locked(malloc_zone_t *zone)
{
zone = runtime_default_zone();
return zone->introspect->zone_locked(zone);
}
static void
default_zone_reinit_lock(malloc_zone_t *zone)
{
zone = runtime_default_zone();
return zone->introspect->reinit_lock(zone);
}
static struct malloc_introspection_t default_zone_introspect = {
default_zone_ptr_in_use_enumerator,
default_zone_good_size,
default_zone_check,
default_zone_print,
default_zone_log,
default_zone_force_lock,
default_zone_force_unlock,
default_zone_statistics,
default_zone_locked,
NULL,
NULL,
NULL,
NULL,
default_zone_reinit_lock
};
typedef struct {
malloc_zone_t malloc_zone;
uint8_t pad[PAGE_MAX_SIZE - sizeof(malloc_zone_t)];
} virtual_default_zone_t;
static virtual_default_zone_t virtual_default_zone
__attribute__((section("__DATA,__v_zone")))
__attribute__((aligned(PAGE_MAX_SIZE))) = {
NULL,
NULL,
default_zone_size,
default_zone_malloc,
default_zone_calloc,
default_zone_valloc,
default_zone_free,
default_zone_realloc,
default_zone_destroy,
DEFAULT_MALLOC_ZONE_STRING,
default_zone_batch_malloc,
default_zone_batch_free,
&default_zone_introspect,
9,
default_zone_memalign,
default_zone_free_definite_size,
default_zone_pressure_relief
};
static malloc_zone_t *default_zone = &virtual_default_zone.malloc_zone;
static boolean_t
has_default_zone0(void)
{
if (!malloc_zones) {
return false;
}
return initial_default_zone == malloc_zones[0];
}
static inline malloc_zone_t *find_registered_zone(const void *, size_t *) __attribute__((always_inline));
static inline malloc_zone_t *
find_registered_zone(const void *ptr, size_t *returned_size)
{
if (0 == malloc_num_zones) {
if (returned_size) {
*returned_size = 0;
}
return NULL;
}
if (lite_zone) {
malloc_zone_t *zone = lite_zone;
size_t size = zone->size(zone, ptr);
if (size) { if (returned_size) {
*returned_size = size;
}
return default_zone;
}
}
malloc_zone_t *zone = malloc_zones[0];
size_t size = zone->size(zone, ptr);
if (size) { if (returned_size) {
*returned_size = size;
}
if (!has_default_zone0()) {
return zone;
} else {
return default_zone;
}
}
int *pFRZCounter = pFRZCounterLive; __sync_fetch_and_add(pFRZCounter, 1);
unsigned index;
int32_t limit = *(volatile int32_t *)&malloc_num_zones;
malloc_zone_t **zones = &malloc_zones[1];
for (index = 1; index < limit; ++index, ++zones) {
zone = *zones;
size = zone->size(zone, ptr);
if (size) { if (returned_size) {
*returned_size = size;
}
__sync_fetch_and_sub(pFRZCounter, 1); return zone;
}
}
if (returned_size) {
*returned_size = 0;
}
__sync_fetch_and_sub(pFRZCounter, 1); return NULL;
}
void
malloc_error_break(void)
{
MAGMALLOC_MALLOCERRORBREAK(); }
int
malloc_gdb_po_unsafe(void)
{
if (__stack_logging_locked()) {
return 1;
}
malloc_zone_t **zones = malloc_zones;
unsigned i, e = malloc_num_zones;
for (i = 0; i != e; ++i) {
malloc_zone_t *zone = zones[i];
if (zone->version < 5) {
continue;
}
if (zone->introspect->zone_locked && zone->introspect->zone_locked(zone)) {
return 1;
}
}
return 0;
}
static void set_flags_from_environment(void);
static void
malloc_zone_register_while_locked(malloc_zone_t *zone)
{
size_t protect_size;
unsigned i;
for (i = 0; i != malloc_num_zones; ++i) {
if (zone == malloc_zones[i]) {
_malloc_printf(ASL_LEVEL_ERR, "Attempted to register zone more than once: %p\n", zone);
return;
}
}
if (malloc_num_zones == malloc_num_zones_allocated) {
size_t malloc_zones_size = malloc_num_zones * sizeof(malloc_zone_t *);
mach_vm_size_t alloc_size = round_page(malloc_zones_size + vm_page_size);
mach_vm_address_t vm_addr;
int alloc_flags = VM_FLAGS_ANYWHERE | VM_MAKE_TAG(VM_MEMORY_MALLOC);
vm_addr = vm_page_size;
kern_return_t kr = mach_vm_allocate(mach_task_self(), &vm_addr, alloc_size, alloc_flags);
if (kr) {
_malloc_printf(ASL_LEVEL_ERR, "malloc_zone_register allocation failed: %d\n", kr);
return;
}
malloc_zone_t **new_zones = (malloc_zone_t **)vm_addr;
if (malloc_zones) {
memcpy(new_zones, malloc_zones, malloc_zones_size);
vm_addr = (mach_vm_address_t)malloc_zones;
mach_vm_size_t dealloc_size = round_page(malloc_zones_size);
mach_vm_deallocate(mach_task_self(), vm_addr, dealloc_size);
}
protect_size = alloc_size;
malloc_zones = new_zones;
malloc_num_zones_allocated = (int32_t)(alloc_size / sizeof(malloc_zone_t *));
} else {
protect_size = malloc_num_zones_allocated * sizeof(malloc_zone_t *);
mprotect(malloc_zones, protect_size, PROT_READ | PROT_WRITE);
}
malloc_zones[malloc_num_zones] = zone;
__sync_fetch_and_add(&malloc_num_zones, 1);
mprotect(malloc_zones, protect_size, PROT_READ);
}
static void
create_and_insert_lite_zone_while_locked()
{
malloc_zone_t *zone0 = malloc_zones[0];
malloc_zone_t *stack_logging_lite_zone = create_stack_logging_lite_zone(0, zone0, malloc_debug_flags);
malloc_zone_register_while_locked(stack_logging_lite_zone);
malloc_set_zone_name(stack_logging_lite_zone, MALLOC_STOCK_LOGGING_LITE_ZONE_NAME);
lite_zone = stack_logging_lite_zone;
}
boolean_t
turn_on_stack_logging(stack_logging_mode_type mode)
{
boolean_t ret = false;
MALLOC_LOCK();
if (!stack_logging_enable_logging) {
if (__uniquing_table_memory_was_deleted()) {
} else {
switch (mode) {
case stack_logging_mode_all:
__prepare_to_log_stacks(false);
malloc_logger = __disk_stack_logging_log_stack;
__syscall_logger = __disk_stack_logging_log_stack;
stack_logging_mode = mode;
stack_logging_enable_logging = 1;
ret = true;
malloc_printf("recording malloc and VM allocation stacks to disk using standard recorder\n");
break;
case stack_logging_mode_malloc:
__prepare_to_log_stacks(false);
malloc_logger = __disk_stack_logging_log_stack;
stack_logging_mode = mode;
stack_logging_enable_logging = 1;
ret = true;
malloc_printf("recording malloc (but not VM allocation) stacks to disk using standard recorder\n");
break;
case stack_logging_mode_vm:
__prepare_to_log_stacks(false);
__syscall_logger = __disk_stack_logging_log_stack;
stack_logging_mode = mode;
stack_logging_enable_logging = 1;
ret = true;
malloc_printf("recording VM allocation (but not malloc) stacks to disk using standard recorder\n");
break;
case stack_logging_mode_lite:
if (!has_default_zone0()) {
malloc_printf("zone[0] is not the normal default zone so can't turn on lite mode.\n", mode);
ret = false;
} else {
malloc_printf("recording malloc (but not VM allocation) stacks using lite mode\n");
if (lite_zone) {
enable_stack_logging_lite();
} else {
if (__prepare_to_log_stacks(true)) {
stack_logging_mode = stack_logging_mode_lite;
stack_logging_enable_logging = 1;
__prepare_to_log_stacks_stage2();
create_and_insert_lite_zone_while_locked();
enable_stack_logging_lite();
}
}
ret = true;
}
break;
default:
malloc_printf("invalid mode %d passed to turn_on_stack_logging\n", mode);
break;
}
}
} else {
malloc_printf("malloc stack logging already enabled.\n");
}
MALLOC_UNLOCK();
return ret;
}
void
turn_off_stack_logging()
{
MALLOC_LOCK();
if (stack_logging_enable_logging) {
switch (stack_logging_mode) {
case stack_logging_mode_all:
malloc_logger = NULL;
__syscall_logger = NULL;
stack_logging_enable_logging = 0;
malloc_printf("turning off recording malloc and VM allocation stacks to disk using standard recorder\n");
break;
case stack_logging_mode_malloc:
malloc_logger = NULL;
stack_logging_enable_logging = 0;
malloc_printf("turnning off recording malloc (but not VM allocation) stacks to disk using standard recorder\n");
break;
case stack_logging_mode_vm:
__syscall_logger = NULL;
stack_logging_enable_logging = 0;
malloc_printf("turning off recording VM allocation (but not malloc) stacks to disk using standard recorder\n");
break;
case stack_logging_mode_lite:
malloc_printf("turning off recording malloc (but not VM allocation) stacks using lite mode\n");
disable_stack_logging_lite();
stack_logging_enable_logging = 0;
break;
default:
malloc_printf("invalid stack_logging_mode %d in turn_off_stack_logging\n", stack_logging_mode);
break;
}
} else {
malloc_printf("malloc stack logging not enabled.\n");
}
MALLOC_UNLOCK();
}
static void
_malloc_initialize(void *context __unused)
{
MALLOC_LOCK();
unsigned n;
malloc_zone_t *zone;
if (!_malloc_entropy_initialized) {
malloc_printf("*** malloc was initialized without entropy\n");
}
set_flags_from_environment(); n = malloc_num_zones;
#if CONFIG_NANOZONE
malloc_zone_t *helper_zone = create_scalable_zone(0, malloc_debug_flags);
zone = create_nano_zone(0, helper_zone, malloc_debug_flags);
if (zone) {
malloc_zone_register_while_locked(zone);
malloc_zone_register_while_locked(helper_zone);
malloc_set_zone_name(zone, DEFAULT_MALLOC_ZONE_STRING);
malloc_set_zone_name(helper_zone, MALLOC_HELPER_ZONE_STRING);
} else {
zone = helper_zone;
malloc_zone_register_while_locked(zone);
malloc_set_zone_name(zone, DEFAULT_MALLOC_ZONE_STRING);
}
#else
zone = create_scalable_zone(0, malloc_debug_flags);
malloc_zone_register_while_locked(zone);
malloc_set_zone_name(zone, DEFAULT_MALLOC_ZONE_STRING);
#endif
initial_default_zone = zone;
if (n != 0) { unsigned protect_size = malloc_num_zones_allocated * sizeof(malloc_zone_t *);
malloc_zone_t *hold = malloc_zones[0];
if (hold->zone_name && strcmp(hold->zone_name, DEFAULT_MALLOC_ZONE_STRING) == 0) {
malloc_set_zone_name(hold, NULL);
}
mprotect(malloc_zones, protect_size, PROT_READ | PROT_WRITE);
malloc_zones[0] = malloc_zones[n];
malloc_zones[n] = hold;
mprotect(malloc_zones, protect_size, PROT_READ);
}
if (stack_logging_enable_logging) {
switch (stack_logging_mode) {
case stack_logging_mode_malloc:
malloc_logger = __disk_stack_logging_log_stack;
break;
case stack_logging_mode_vm:
__syscall_logger = __disk_stack_logging_log_stack;
break;
case stack_logging_mode_all:
malloc_logger = __disk_stack_logging_log_stack;
__syscall_logger = __disk_stack_logging_log_stack;
break;
case stack_logging_mode_lite:
create_and_insert_lite_zone_while_locked();
enable_stack_logging_lite();
break;
}
}
MALLOC_UNLOCK();
}
MALLOC_ALWAYS_INLINE
static inline void
_malloc_initialize_once(void)
{
os_once(&_malloc_initialize_pred, NULL, _malloc_initialize);
}
static inline malloc_zone_t *
inline_malloc_default_zone(void)
{
_malloc_initialize_once();
return malloc_zones[0];
}
malloc_zone_t *
malloc_default_zone(void)
{
return default_zone;
}
static inline malloc_zone_t *inline_malloc_default_scalable_zone(void) __attribute__((always_inline));
static inline malloc_zone_t *
inline_malloc_default_scalable_zone(void)
{
unsigned index;
_malloc_initialize_once();
MALLOC_LOCK();
#if CONFIG_NANOZONE
for (index = 0; index < malloc_num_zones; ++index) {
malloc_zone_t *z = malloc_zones[index];
if (z->zone_name && strcmp(z->zone_name, MALLOC_HELPER_ZONE_STRING) == 0) {
MALLOC_UNLOCK();
return z;
}
}
#endif
for (index = 0; index < malloc_num_zones; ++index) {
malloc_zone_t *z = malloc_zones[index];
if (z->zone_name && strcmp(z->zone_name, DEFAULT_MALLOC_ZONE_STRING) == 0) {
MALLOC_UNLOCK();
return z;
}
}
MALLOC_UNLOCK();
malloc_printf("*** malloc_default_scalable_zone() failed to find 'DefaultMallocZone'\n");
return NULL; }
static void *
legacy_zeroing_large_malloc(malloc_zone_t *zone, size_t size)
{
if (size > LARGE_THRESHOLD) { return default_zone_calloc(zone, 1, size); } else {
return default_zone_malloc(zone, size);
}
}
static void *
legacy_zeroing_large_valloc(malloc_zone_t *zone, size_t size)
{
void *p = default_zone_valloc(zone, size);
memset(p, 0, size); return p;
}
void
zeroify_scalable_zone(malloc_zone_t *zone)
{
if (zone == default_zone) {
zone->malloc = (void *)legacy_zeroing_large_malloc;
zone->valloc = (void *)legacy_zeroing_large_valloc;
}
}
boolean_t
malloc_engaged_nano(void)
{
#if CONFIG_NANOZONE
return _malloc_engaged_nano;
#else
return 0;
#endif
}
malloc_zone_t *
malloc_default_purgeable_zone(void)
{
static malloc_zone_t *dpz;
if (!dpz) {
malloc_zone_t *tmp = create_purgeable_zone(0, inline_malloc_default_scalable_zone(), malloc_debug_flags);
malloc_zone_register(tmp);
malloc_set_zone_name(tmp, DEFAULT_PUREGEABLE_ZONE_STRING);
if (!__sync_bool_compare_and_swap(&dpz, NULL, tmp)) {
malloc_destroy_zone(tmp);
}
}
return dpz;
}
static void
set_flags_from_environment(void)
{
const char *flag;
int fd;
char **env = *_NSGetEnviron();
char **p;
char *c;
bool restricted = 0;
if (malloc_debug_file != STDERR_FILENO) {
close(malloc_debug_file);
malloc_debug_file = STDERR_FILENO;
}
#if __LP64__
malloc_debug_flags = MALLOC_ABORT_ON_CORRUPTION; #else
int libSystemVersion = NSVersionOfLinkTimeLibrary("System");
if ((-1 != libSystemVersion) && ((libSystemVersion >> 16) < 126) ) {
malloc_debug_flags = 0;
} else {
malloc_debug_flags = MALLOC_ABORT_ON_CORRUPTION;
}
#endif
stack_logging_enable_logging = 0;
stack_logging_dontcompact = 0;
malloc_logger = NULL;
malloc_check_start = 0;
malloc_check_each = 1000;
malloc_check_abort = 0;
malloc_check_sleep = 100;
for (p = env; (c = *p) != NULL; ++p) {
if (!strncmp(c, "Malloc", 6)) {
if (issetugid()) {
return;
}
break;
}
}
restricted = dyld_process_is_restricted();
if (c == NULL) {
return;
}
if (!restricted) {
flag = getenv("MallocLogFile");
if (flag) {
fd = open(flag, O_WRONLY | O_APPEND | O_CREAT, 0644);
if (fd >= 0) {
malloc_debug_file = fd;
fcntl(fd, F_SETFD, 0); } else {
malloc_printf("Could not open %s, using stderr\n", flag);
}
}
}
if (getenv("MallocGuardEdges")) {
malloc_debug_flags |= MALLOC_ADD_GUARD_PAGES;
_malloc_printf(ASL_LEVEL_INFO, "protecting edges\n");
if (getenv("MallocDoNotProtectPrelude")) {
malloc_debug_flags |= MALLOC_DONT_PROTECT_PRELUDE;
_malloc_printf(ASL_LEVEL_INFO, "... but not protecting prelude guard page\n");
}
if (getenv("MallocDoNotProtectPostlude")) {
malloc_debug_flags |= MALLOC_DONT_PROTECT_POSTLUDE;
_malloc_printf(ASL_LEVEL_INFO, "... but not protecting postlude guard page\n");
}
}
flag = getenv("MallocStackLogging");
if (!flag) {
flag = getenv("MallocStackLoggingNoCompact");
stack_logging_dontcompact = 1;
}
if (flag) {
boolean_t lite_mode = strcmp(flag, "lite") == 0;
__prepare_to_log_stacks(lite_mode);
if (strcmp(flag, "lite") == 0) {
stack_logging_mode = stack_logging_mode_lite;
_malloc_printf(ASL_LEVEL_INFO, "recording malloc (but not VM allocation) stacks using lite mode\n");
} else if (strcmp(flag,"malloc") == 0) {
stack_logging_mode = stack_logging_mode_malloc;
_malloc_printf(ASL_LEVEL_INFO, "recording malloc (but not VM allocation) stacks to disk using standard recorder\n");
} else if (strcmp(flag, "vm") == 0) {
stack_logging_mode = stack_logging_mode_vm;
_malloc_printf(ASL_LEVEL_INFO, "recording VM allocation (but not malloc) stacks to disk using standard recorder\n");
} else {
stack_logging_mode = stack_logging_mode_all;
_malloc_printf(ASL_LEVEL_INFO, "recording malloc and VM allocation stacks to disk using standard recorder\n");
}
stack_logging_enable_logging = 1;
if (stack_logging_dontcompact) {
if (stack_logging_mode == stack_logging_mode_all || stack_logging_mode == stack_logging_mode_malloc) {
_malloc_printf(
ASL_LEVEL_INFO, "stack logging compaction turned off; size of log files on disk can increase rapidly\n");
} else {
_malloc_printf(ASL_LEVEL_INFO, "stack logging compaction turned off; VM can increase rapidly\n");
}
}
}
if (getenv("MallocScribble")) {
malloc_debug_flags |= MALLOC_DO_SCRIBBLE;
_malloc_printf(ASL_LEVEL_INFO, "enabling scribbling to detect mods to free blocks\n");
}
if (getenv("MallocErrorAbort")) {
malloc_debug_flags |= MALLOC_ABORT_ON_ERROR;
_malloc_printf(ASL_LEVEL_INFO, "enabling abort() on bad malloc or free\n");
}
if (getenv("MallocTracing")) {
malloc_tracing_enabled = true;
}
#if CONFIG_NANOZONE
if ((flag = getenv("MallocNanoZone"))) {
if (flag[0] == '1') {
_malloc_engaged_nano = 1;
} else if (flag[0] == '0') {
_malloc_engaged_nano = 0;
}
}
#endif
#if __LP64__
#else
flag = getenv("MallocCorruptionAbort");
if (!restricted && flag && (flag[0] == '0')) { malloc_debug_flags &= ~MALLOC_ABORT_ON_CORRUPTION;
} else if (flag) {
malloc_debug_flags |= MALLOC_ABORT_ON_CORRUPTION;
}
#endif
flag = getenv("MallocCheckHeapStart");
if (flag) {
malloc_check_start = (unsigned)strtoul(flag, NULL, 0);
if (malloc_check_start == 0) {
malloc_check_start = 1;
}
if (malloc_check_start == -1) {
malloc_check_start = 1;
}
flag = getenv("MallocCheckHeapEach");
if (flag) {
malloc_check_each = (unsigned)strtoul(flag, NULL, 0);
if (malloc_check_each == 0) {
malloc_check_each = 1;
}
if (malloc_check_each == -1) {
malloc_check_each = 1;
}
}
_malloc_printf(
ASL_LEVEL_INFO, "checks heap after %dth operation and each %d operations\n", malloc_check_start, malloc_check_each);
flag = getenv("MallocCheckHeapAbort");
if (flag) {
malloc_check_abort = (unsigned)strtol(flag, NULL, 0);
}
if (malloc_check_abort) {
_malloc_printf(ASL_LEVEL_INFO, "will abort on heap corruption\n");
} else {
flag = getenv("MallocCheckHeapSleep");
if (flag) {
malloc_check_sleep = (unsigned)strtol(flag, NULL, 0);
}
if (malloc_check_sleep > 0) {
_malloc_printf(ASL_LEVEL_INFO, "will sleep for %d seconds on heap corruption\n", malloc_check_sleep);
} else if (malloc_check_sleep < 0) {
_malloc_printf(ASL_LEVEL_INFO, "will sleep once for %d seconds on heap corruption\n", -malloc_check_sleep);
} else {
_malloc_printf(ASL_LEVEL_INFO, "no sleep on heap corruption\n");
}
}
}
if (getenv("MallocHelp")) {
_malloc_printf(ASL_LEVEL_INFO,
"environment variables that can be set for debug:\n"
"- MallocLogFile <f> to create/append messages to file <f> instead of stderr\n"
"- MallocGuardEdges to add 2 guard pages for each large block\n"
"- MallocDoNotProtectPrelude to disable protection (when previous flag set)\n"
"- MallocDoNotProtectPostlude to disable protection (when previous flag set)\n"
"- MallocStackLogging to record all stacks. Tools like leaks can then be applied\n"
"- MallocStackLoggingNoCompact to record all stacks. Needed for malloc_history\n"
"- MallocStackLoggingDirectory to set location of stack logs, which can grow large; default is /tmp\n"
"- MallocScribble to detect writing on free blocks and missing initializers:\n"
" 0x55 is written upon free and 0xaa is written on allocation\n"
"- MallocCheckHeapStart <n> to start checking the heap after <n> operations\n"
"- MallocCheckHeapEach <s> to repeat the checking of the heap after <s> operations\n"
"- MallocCheckHeapSleep <t> to sleep <t> seconds on heap corruption\n"
"- MallocCheckHeapAbort <b> to abort on heap corruption if <b> is non-zero\n"
"- MallocCorruptionAbort to abort on malloc errors, but not on out of memory for 32-bit processes\n"
" MallocCorruptionAbort is always set on 64-bit processes\n"
"- MallocErrorAbort to abort on any malloc error, including out of memory\n"\
"- MallocTracing to emit kdebug trace points on malloc entry points\n"\
"- MallocHelp - this help!\n");
}
}
malloc_zone_t *
malloc_create_zone(vm_size_t start_size, unsigned flags)
{
malloc_zone_t *zone;
if (start_size > MALLOC_ABSOLUTE_MAX_SIZE) {
return NULL;
}
_malloc_initialize_once();
zone = create_scalable_zone(start_size, flags | malloc_debug_flags);
malloc_zone_register(zone);
return zone;
}
void
malloc_create_legacy_default_zone(void)
{
malloc_zone_t *zone;
int i;
_malloc_initialize_once();
zone = create_legacy_scalable_zone(0, malloc_debug_flags);
MALLOC_LOCK();
malloc_zone_register_while_locked(zone);
malloc_zone_t *hold = malloc_zones[0];
if (hold->zone_name && strcmp(hold->zone_name, DEFAULT_MALLOC_ZONE_STRING) == 0) {
malloc_set_zone_name(hold, NULL);
}
malloc_set_zone_name(zone, DEFAULT_MALLOC_ZONE_STRING);
unsigned protect_size = malloc_num_zones_allocated * sizeof(malloc_zone_t *);
mprotect(malloc_zones, protect_size, PROT_READ | PROT_WRITE);
for (i = malloc_num_zones - 1; i > 0; --i) {
malloc_zones[i] = malloc_zones[i - 1];
}
malloc_zones[0] = zone;
mprotect(malloc_zones, protect_size, PROT_READ);
MALLOC_UNLOCK();
}
void
malloc_destroy_zone(malloc_zone_t *zone)
{
malloc_set_zone_name(zone, NULL); malloc_zone_unregister(zone);
zone->destroy(zone);
}
static void
internal_check(void)
{
static vm_address_t *frames = NULL;
static unsigned num_frames;
if (malloc_zone_check(NULL)) {
if (!frames) {
vm_allocate(mach_task_self(), (void *)&frames, vm_page_size, 1);
}
thread_stack_pcs(frames, (unsigned)(vm_page_size / sizeof(vm_address_t) - 1), &num_frames);
} else {
_SIMPLE_STRING b = _simple_salloc();
if (b) {
_simple_sprintf(b, "*** MallocCheckHeap: FAILED check at %dth operation\n", malloc_check_counter - 1);
} else {
_malloc_printf(MALLOC_PRINTF_NOLOG, "*** MallocCheckHeap: FAILED check at %dth operation\n", malloc_check_counter - 1);
}
malloc_printf("*** MallocCheckHeap: FAILED check at %dth operation\n", malloc_check_counter - 1);
if (frames) {
unsigned index = 1;
if (b) {
_simple_sappend(b, "Stack for last operation where the malloc check succeeded: ");
while (index < num_frames)
_simple_sprintf(b, "%p ", frames[index++]);
malloc_printf("%s\n(Use 'atos' for a symbolic stack)\n", _simple_string(b));
} else {
_malloc_printf(MALLOC_PRINTF_NOLOG, "Stack for last operation where the malloc check succeeded: ");
while (index < num_frames)
_malloc_printf(MALLOC_PRINTF_NOLOG, "%p ", frames[index++]);
_malloc_printf(MALLOC_PRINTF_NOLOG, "\n(Use 'atos' for a symbolic stack)\n");
}
}
if (malloc_check_each > 1) {
unsigned recomm_each = (malloc_check_each > 10) ? malloc_check_each / 10 : 1;
unsigned recomm_start =
(malloc_check_counter > malloc_check_each + 1) ? malloc_check_counter - 1 - malloc_check_each : 1;
malloc_printf(
"*** Recommend using 'setenv MallocCheckHeapStart %d; setenv MallocCheckHeapEach %d' to narrow down failure\n",
recomm_start, recomm_each);
}
if (malloc_check_abort) {
if (b) {
_os_set_crash_log_message_dynamic(_simple_string(b));
} else {
_os_set_crash_log_message("*** MallocCheckHeap: FAILED check");
}
abort();
} else if (b) {
_simple_sfree(b);
}
if (malloc_check_sleep > 0) {
_malloc_printf(ASL_LEVEL_NOTICE, "*** Sleeping for %d seconds to leave time to attach\n", malloc_check_sleep);
sleep(malloc_check_sleep);
} else if (malloc_check_sleep < 0) {
_malloc_printf(ASL_LEVEL_NOTICE, "*** Sleeping once for %d seconds to leave time to attach\n", -malloc_check_sleep);
sleep(-malloc_check_sleep);
malloc_check_sleep = 0;
}
}
malloc_check_start += malloc_check_each;
}
void *
malloc_zone_malloc(malloc_zone_t *zone, size_t size)
{
MALLOC_TRACE(TRACE_malloc | DBG_FUNC_START, (uintptr_t)zone, size, 0, 0);
void *ptr;
if (malloc_check_start && (malloc_check_counter++ >= malloc_check_start)) {
internal_check();
}
if (size > MALLOC_ABSOLUTE_MAX_SIZE) {
return NULL;
}
ptr = zone->malloc(zone, size);
if (malloc_logger) {
malloc_logger(MALLOC_LOG_TYPE_ALLOCATE | MALLOC_LOG_TYPE_HAS_ZONE, (uintptr_t)zone, (uintptr_t)size, 0, (uintptr_t)ptr, 0);
}
MALLOC_TRACE(TRACE_malloc | DBG_FUNC_END, (uintptr_t)zone, size, (uintptr_t)ptr, 0);
return ptr;
}
void *
malloc_zone_calloc(malloc_zone_t *zone, size_t num_items, size_t size)
{
void *ptr;
size_t alloc_size;
if (malloc_check_start && (malloc_check_counter++ >= malloc_check_start)) {
internal_check();
}
if (os_mul_overflow(num_items, size, &alloc_size) || alloc_size > MALLOC_ABSOLUTE_MAX_SIZE){
errno = ENOMEM;
return NULL;
}
ptr = zone->calloc(zone, num_items, size);
if (malloc_logger) {
malloc_logger(MALLOC_LOG_TYPE_ALLOCATE | MALLOC_LOG_TYPE_HAS_ZONE | MALLOC_LOG_TYPE_CLEARED, (uintptr_t)zone,
(uintptr_t)(num_items * size), 0, (uintptr_t)ptr, 0);
}
return ptr;
}
void *
malloc_zone_valloc(malloc_zone_t *zone, size_t size)
{
void *ptr;
if (malloc_check_start && (malloc_check_counter++ >= malloc_check_start)) {
internal_check();
}
if (size > MALLOC_ABSOLUTE_MAX_SIZE) {
return NULL;
}
ptr = zone->valloc(zone, size);
if (malloc_logger) {
malloc_logger(MALLOC_LOG_TYPE_ALLOCATE | MALLOC_LOG_TYPE_HAS_ZONE, (uintptr_t)zone, (uintptr_t)size, 0, (uintptr_t)ptr, 0);
}
return ptr;
}
void *
malloc_zone_realloc(malloc_zone_t *zone, void *ptr, size_t size)
{
MALLOC_TRACE(TRACE_realloc | DBG_FUNC_START, (uintptr_t)zone, (uintptr_t)ptr, size, 0);
void *new_ptr;
if (malloc_check_start && (malloc_check_counter++ >= malloc_check_start)) {
internal_check();
}
if (size > MALLOC_ABSOLUTE_MAX_SIZE) {
return NULL;
}
new_ptr = zone->realloc(zone, ptr, size);
if (malloc_logger) {
malloc_logger(MALLOC_LOG_TYPE_ALLOCATE | MALLOC_LOG_TYPE_DEALLOCATE | MALLOC_LOG_TYPE_HAS_ZONE, (uintptr_t)zone,
(uintptr_t)ptr, (uintptr_t)size, (uintptr_t)new_ptr, 0);
}
MALLOC_TRACE(TRACE_realloc | DBG_FUNC_END, (uintptr_t)zone, (uintptr_t)ptr, size, (uintptr_t)new_ptr);
return new_ptr;
}
void
malloc_zone_free(malloc_zone_t *zone, void *ptr)
{
MALLOC_TRACE(TRACE_free, (uintptr_t)zone, (uintptr_t)ptr, 0, 0);
if (malloc_logger) {
malloc_logger(MALLOC_LOG_TYPE_DEALLOCATE | MALLOC_LOG_TYPE_HAS_ZONE, (uintptr_t)zone, (uintptr_t)ptr, 0, 0, 0);
}
if (malloc_check_start && (malloc_check_counter++ >= malloc_check_start)) {
internal_check();
}
zone->free(zone, ptr);
}
static void
malloc_zone_free_definite_size(malloc_zone_t *zone, void *ptr, size_t size)
{
MALLOC_TRACE(TRACE_free, (uintptr_t)zone, (uintptr_t)ptr, size, 0);
if (malloc_logger) {
malloc_logger(MALLOC_LOG_TYPE_DEALLOCATE | MALLOC_LOG_TYPE_HAS_ZONE, (uintptr_t)zone, (uintptr_t)ptr, 0, 0, 0);
}
if (malloc_check_start && (malloc_check_counter++ >= malloc_check_start)) {
internal_check();
}
zone->free_definite_size(zone, ptr, size);
}
malloc_zone_t *
malloc_zone_from_ptr(const void *ptr)
{
if (!ptr) {
return NULL;
} else {
return find_registered_zone(ptr, NULL);
}
}
void *
malloc_zone_memalign(malloc_zone_t *zone, size_t alignment, size_t size)
{
MALLOC_TRACE(TRACE_memalign | DBG_FUNC_START, (uintptr_t)zone, alignment, size, 0);
void *ptr;
if (zone->version < 5) { return NULL;
}
if (malloc_check_start && (malloc_check_counter++ >= malloc_check_start)) {
internal_check();
}
if (size > MALLOC_ABSOLUTE_MAX_SIZE) {
return NULL;
}
if (alignment < sizeof(void *) || 0 != (alignment & (alignment - 1))) { return NULL;
}
if (!(zone->memalign)) {
return NULL;
}
ptr = zone->memalign(zone, alignment, size);
if (malloc_logger) {
malloc_logger(MALLOC_LOG_TYPE_ALLOCATE | MALLOC_LOG_TYPE_HAS_ZONE, (uintptr_t)zone, (uintptr_t)size, 0, (uintptr_t)ptr, 0);
}
MALLOC_TRACE(TRACE_memalign | DBG_FUNC_END, (uintptr_t)zone, alignment, size, (uintptr_t)ptr);
return ptr;
}
void
malloc_zone_register(malloc_zone_t *zone)
{
MALLOC_LOCK();
malloc_zone_register_while_locked(zone);
MALLOC_UNLOCK();
}
void
malloc_zone_unregister(malloc_zone_t *z)
{
unsigned index;
if (malloc_num_zones == 0) {
return;
}
MALLOC_LOCK();
for (index = 0; index < malloc_num_zones; ++index) {
if (z != malloc_zones[index]) {
continue;
}
size_t protect_size = malloc_num_zones_allocated * sizeof(malloc_zone_t *);
mprotect(malloc_zones, protect_size, PROT_READ | PROT_WRITE);
malloc_zones[index] = malloc_zones[malloc_num_zones - 1];
--malloc_num_zones;
mprotect(malloc_zones, protect_size, PROT_READ);
int *p = pFRZCounterLive;
pFRZCounterLive = pFRZCounterDrain;
pFRZCounterDrain = p;
__sync_synchronize();
while (0 != *pFRZCounterDrain) {
yield();
}
MALLOC_UNLOCK();
return;
}
MALLOC_UNLOCK();
malloc_printf("*** malloc_zone_unregister() failed for %p\n", z);
}
void
malloc_set_zone_name(malloc_zone_t *z, const char *name)
{
char *newName;
mprotect(z, sizeof(malloc_zone_t), PROT_READ | PROT_WRITE);
if (z->zone_name) {
free((char *)z->zone_name);
z->zone_name = NULL;
}
if (name) {
size_t buflen = strlen(name) + 1;
newName = malloc_zone_malloc(z, buflen);
if (newName) {
strlcpy(newName, name, buflen);
z->zone_name = (const char *)newName;
} else {
z->zone_name = NULL;
}
}
mprotect(z, sizeof(malloc_zone_t), PROT_READ);
}
const char *
malloc_get_zone_name(malloc_zone_t *zone)
{
return zone->zone_name;
}
__attribute__((visibility("hidden"))) void
_malloc_vprintf(int flags, const char *format, va_list ap)
{
_SIMPLE_STRING b;
if (_malloc_no_asl_log || (flags & MALLOC_PRINTF_NOLOG) || (b = _simple_salloc()) == NULL) {
if (!(flags & MALLOC_PRINTF_NOPREFIX)) {
void *self = _os_tsd_get_direct(__TSD_THREAD_SELF);
_simple_dprintf(malloc_debug_file, "%s(%d,%p) malloc: ", getprogname(), getpid(), self);
}
_simple_vdprintf(malloc_debug_file, format, ap);
return;
}
if (!(flags & MALLOC_PRINTF_NOPREFIX)) {
void *self = _os_tsd_get_direct(__TSD_THREAD_SELF);
_simple_sprintf(b, "%s(%d,%p) malloc: ", getprogname(), getpid(), self);
}
_simple_vsprintf(b, format, ap);
_simple_put(b, malloc_debug_file);
_simple_asl_log(flags & MALLOC_PRINTF_LEVEL_MASK, Malloc_Facility, _simple_string(b));
_simple_sfree(b);
}
__attribute__((visibility("hidden"))) void
_malloc_printf(int flags, const char *format, ...)
{
va_list ap;
va_start(ap, format);
_malloc_vprintf(flags, format, ap);
va_end(ap);
}
void
malloc_printf(const char *format, ...)
{
va_list ap;
va_start(ap, format);
_malloc_vprintf(ASL_LEVEL_ERR, format, ap);
va_end(ap);
}
void *
malloc(size_t size)
{
void *retval;
retval = malloc_zone_malloc(default_zone, size);
if (retval == NULL) {
errno = ENOMEM;
}
return retval;
}
void *
calloc(size_t num_items, size_t size)
{
void *retval;
retval = malloc_zone_calloc(default_zone, num_items, size);
if (retval == NULL) {
errno = ENOMEM;
}
return retval;
}
void
free(void *ptr)
{
malloc_zone_t *zone;
size_t size;
if (!ptr) {
return;
}
zone = find_registered_zone(ptr, &size);
if (!zone) {
malloc_printf(
"*** error for object %p: pointer being freed was not allocated\n"
"*** set a breakpoint in malloc_error_break to debug\n",
ptr);
malloc_error_break();
if ((malloc_debug_flags & (MALLOC_ABORT_ON_CORRUPTION | MALLOC_ABORT_ON_ERROR))) {
_SIMPLE_STRING b = _simple_salloc();
if (b) {
_simple_sprintf(b, "*** error for object %p: pointer being freed was not allocated\n", ptr);
_os_set_crash_log_message_dynamic(_simple_string(b));
} else {
_os_set_crash_log_message("*** error: pointer being freed was not allocated\n");
}
abort();
}
} else if (zone->version >= 6 && zone->free_definite_size) {
malloc_zone_free_definite_size(zone, ptr, size);
} else {
malloc_zone_free(zone, ptr);
}
}
void *
realloc(void *in_ptr, size_t new_size)
{
void *retval = NULL;
void *old_ptr;
malloc_zone_t *zone;
old_ptr = (new_size == 0) ? NULL : in_ptr;
if (!old_ptr) {
retval = malloc_zone_malloc(default_zone, new_size);
} else {
zone = find_registered_zone(old_ptr, NULL);
if (!zone) {
malloc_printf(
"*** error for object %p: pointer being realloc'd was not allocated\n"
"*** set a breakpoint in malloc_error_break to debug\n",
old_ptr);
malloc_error_break();
if ((malloc_debug_flags & (MALLOC_ABORT_ON_CORRUPTION | MALLOC_ABORT_ON_ERROR))) {
_SIMPLE_STRING b = _simple_salloc();
if (b) {
_simple_sprintf(b, "*** error for object %p: pointer being realloc'd was not allocated\n", old_ptr);
_os_set_crash_log_message_dynamic(_simple_string(b));
} else {
_os_set_crash_log_message("*** error: pointer being realloc'd was not allocated\n");
}
abort();
}
} else {
retval = malloc_zone_realloc(zone, old_ptr, new_size);
}
}
if (retval == NULL) {
errno = ENOMEM;
} else if (new_size == 0) {
free(in_ptr);
}
return retval;
}
void *
valloc(size_t size)
{
void *retval;
malloc_zone_t *zone = default_zone;
retval = malloc_zone_valloc(zone, size);
if (retval == NULL) {
errno = ENOMEM;
}
return retval;
}
extern void
vfree(void *ptr)
{
free(ptr);
}
size_t
malloc_size(const void *ptr)
{
size_t size = 0;
if (!ptr) {
return size;
}
(void)find_registered_zone(ptr, &size);
return size;
}
size_t
malloc_good_size(size_t size)
{
malloc_zone_t *zone = default_zone;
return zone->introspect->good_size(zone, size);
}
int
posix_memalign(void **memptr, size_t alignment, size_t size)
{
void *retval;
retval = malloc_zone_memalign(default_zone, alignment, size);
if (retval == NULL) {
if (alignment < sizeof(void *) || 0 != (alignment & (alignment - 1))) { return EINVAL;
}
return ENOMEM;
} else {
*memptr = retval; return 0;
}
}
void *
reallocarray(void * in_ptr, size_t nmemb, size_t size){
size_t alloc_size;
if (os_mul_overflow(nmemb, size, &alloc_size)){
errno = ENOMEM;
return NULL;
}
return realloc(in_ptr, alloc_size);
}
void *
reallocarrayf(void * in_ptr, size_t nmemb, size_t size){
size_t alloc_size;
if (os_mul_overflow(nmemb, size, &alloc_size)){
errno = ENOMEM;
return NULL;
}
return reallocf(in_ptr, alloc_size);
}
static malloc_zone_t *
find_registered_purgeable_zone(void *ptr)
{
if (!ptr) {
return NULL;
}
size_t size = 0;
malloc_zone_t *zone = find_registered_zone(ptr, &size);
if (!zone) {
return NULL;
}
if ((size < vm_page_size) || ((size % vm_page_size) != 0)) {
return NULL;
}
return zone;
}
void
malloc_make_purgeable(void *ptr)
{
malloc_zone_t *zone = find_registered_purgeable_zone(ptr);
if (!zone) {
return;
}
int state = VM_PURGABLE_VOLATILE;
vm_purgable_control(mach_task_self(), (vm_address_t)ptr, VM_PURGABLE_SET_STATE, &state);
return;
}
int
malloc_make_nonpurgeable(void *ptr)
{
malloc_zone_t *zone = find_registered_purgeable_zone(ptr);
if (!zone) {
return 0;
}
int state = VM_PURGABLE_NONVOLATILE;
vm_purgable_control(mach_task_self(), (vm_address_t)ptr, VM_PURGABLE_SET_STATE, &state);
if (state == VM_PURGABLE_EMPTY) {
return EFAULT;
}
return 0;
}
void
malloc_enter_process_memory_limit_warn_mode(void)
{
}
#if ENABLE_MEMORY_RESOURCE_EXCEPTION_HANDLING
static boolean_t
check_is_eligible_for_lite_mode_mre_handling(void)
{
struct stat stat_buf;
if (stat("/var/db/disableLiteModeMemoryResourceExceptionHandling", &stat_buf) == 0) {
return false;
}
if (stat("/var/db/enableLiteModeMemoryResourceExceptionHandling", &stat_buf) == 0) {
return true;
}
return false;
}
static boolean_t
is_eligible_for_lite_mode_mre_handling(void)
{
static boolean_t is_eligible = false;
static boolean_t needs_check = true;
if (needs_check) {
is_eligible = check_is_eligible_for_lite_mode_mre_handling();
needs_check = false;
}
return is_eligible;
}
#endif
void
malloc_memory_event_handler(unsigned long event)
{
if (event & NOTE_MEMORYSTATUS_PRESSURE_WARN) {
malloc_zone_pressure_relief(0, 0);
}
#if ENABLE_MEMORY_RESOURCE_EXCEPTION_HANDLING
static boolean_t warn_mode_entered = false;
static boolean_t warn_mode_disable_retries = false;
if ((event & (NOTE_MEMORYSTATUS_PROC_LIMIT_CRITICAL | NOTE_MEMORYSTATUS_PRESSURE_CRITICAL)) &&
!warn_mode_disable_retries) {
warn_mode_disable_retries = true;
if (warn_mode_entered) {
malloc_printf("malloc_memory_event_handler: stopping stack-logging\n");
turn_off_stack_logging();
__malloc_lock_stack_logging();
__delete_uniquing_table_memory_while_locked();
__malloc_unlock_stack_logging();
warn_mode_entered = false;
}
}
if ((event & NOTE_MEMORYSTATUS_PROC_LIMIT_WARN) &&
!(event & NOTE_MEMORYSTATUS_PRESSURE_CRITICAL) &&
!warn_mode_entered && !warn_mode_disable_retries &&
is_eligible_for_lite_mode_mre_handling()) {
malloc_printf("malloc_memory_event_handler: approaching memory limit. Starting stack-logging.\n");
if (turn_on_stack_logging(stack_logging_mode_lite)) {
warn_mode_entered = true;
max_lite_mallocs = MAX_LITE_MALLOCS;
}
}
#endif
}
size_t
malloc_zone_pressure_relief(malloc_zone_t *zone, size_t goal)
{
if (!zone) {
unsigned index = 0;
size_t total = 0;
MALLOC_LOCK();
while (index < malloc_num_zones) {
zone = malloc_zones[index++];
if (zone->version < 8) {
continue;
}
if (NULL == zone->pressure_relief) {
continue;
}
if (0 == goal) {
total += zone->pressure_relief(zone, 0);
} else if (goal > total) {
total += zone->pressure_relief(zone, goal - total);
} else {
break;
}
}
MALLOC_UNLOCK();
return total;
} else {
if (zone->version < 8) {
return 0;
}
if (NULL == zone->pressure_relief) {
return 0;
}
return zone->pressure_relief(zone, goal);
}
}
unsigned
malloc_zone_batch_malloc(malloc_zone_t *zone, size_t size, void **results, unsigned num_requested)
{
if (!zone->batch_malloc) {
return 0;
}
if (malloc_check_start && (malloc_check_counter++ >= malloc_check_start)) {
internal_check();
}
unsigned batched = zone->batch_malloc(zone, size, results, num_requested);
if (malloc_logger) {
unsigned index = 0;
while (index < batched) {
malloc_logger(MALLOC_LOG_TYPE_ALLOCATE | MALLOC_LOG_TYPE_HAS_ZONE, (uintptr_t)zone, (uintptr_t)size, 0,
(uintptr_t)results[index], 0);
index++;
}
}
return batched;
}
void
malloc_zone_batch_free(malloc_zone_t *zone, void **to_be_freed, unsigned num)
{
if (malloc_check_start && (malloc_check_counter++ >= malloc_check_start)) {
internal_check();
}
if (malloc_logger) {
unsigned index = 0;
while (index < num) {
malloc_logger(
MALLOC_LOG_TYPE_DEALLOCATE | MALLOC_LOG_TYPE_HAS_ZONE, (uintptr_t)zone, (uintptr_t)to_be_freed[index], 0, 0, 0);
index++;
}
}
if (zone->batch_free) {
zone->batch_free(zone, to_be_freed, num);
} else {
void (*free_fun)(malloc_zone_t *, void *) = zone->free;
while (num--) {
void *ptr = *to_be_freed++;
free_fun(zone, ptr);
}
}
}
static kern_return_t
_malloc_default_reader(task_t task, vm_address_t address, vm_size_t size, void **ptr)
{
*ptr = (void *)address;
return 0;
}
kern_return_t
malloc_get_all_zones(task_t task, memory_reader_t reader, vm_address_t **addresses, unsigned *count)
{
vm_address_t remote_malloc_zones = (vm_address_t)&malloc_zones;
vm_address_t remote_malloc_num_zones = (vm_address_t)&malloc_num_zones;
kern_return_t err;
vm_address_t zones_address;
vm_address_t *zones_address_ref;
unsigned num_zones;
unsigned *num_zones_ref;
if (!reader) {
reader = _malloc_default_reader;
}
err = reader(task, remote_malloc_zones, sizeof(void *), (void **)&zones_address_ref);
if (err) {
malloc_printf("*** malloc_get_all_zones: error reading zones_address at %p\n", (unsigned)remote_malloc_zones);
return err;
}
zones_address = *zones_address_ref;
err = reader(task, remote_malloc_num_zones, sizeof(unsigned), (void **)&num_zones_ref);
if (err) {
malloc_printf("*** malloc_get_all_zones: error reading num_zones at %p\n", (unsigned)remote_malloc_num_zones);
return err;
}
num_zones = *num_zones_ref;
*count = num_zones;
err = reader(task, zones_address, sizeof(malloc_zone_t *) * num_zones, (void **)addresses);
if (err) {
malloc_printf("*** malloc_get_all_zones: error reading zones at %p\n", &zones_address);
return err;
}
return err;
}
void
malloc_zone_print_ptr_info(void *ptr)
{
malloc_zone_t *zone;
if (!ptr) {
return;
}
zone = malloc_zone_from_ptr(ptr);
if (zone) {
printf("ptr %p in registered zone %p\n", ptr, zone);
} else {
printf("ptr %p not in heap\n", ptr);
}
}
boolean_t
malloc_zone_check(malloc_zone_t *zone)
{
boolean_t ok = 1;
if (!zone) {
unsigned index = 0;
while (index < malloc_num_zones) {
zone = malloc_zones[index++];
if (!zone->introspect->check(zone)) {
ok = 0;
}
}
} else {
ok = zone->introspect->check(zone);
}
return ok;
}
void
malloc_zone_print(malloc_zone_t *zone, boolean_t verbose)
{
if (!zone) {
unsigned index = 0;
while (index < malloc_num_zones) {
zone = malloc_zones[index++];
zone->introspect->print(zone, verbose);
}
} else {
zone->introspect->print(zone, verbose);
}
}
void
malloc_zone_statistics(malloc_zone_t *zone, malloc_statistics_t *stats)
{
if (!zone) {
memset(stats, 0, sizeof(*stats));
unsigned index = 0;
while (index < malloc_num_zones) {
zone = malloc_zones[index++];
malloc_statistics_t this_stats;
zone->introspect->statistics(zone, &this_stats);
stats->blocks_in_use += this_stats.blocks_in_use;
stats->size_in_use += this_stats.size_in_use;
stats->max_size_in_use += this_stats.max_size_in_use;
stats->size_allocated += this_stats.size_allocated;
}
} else {
zone->introspect->statistics(zone, stats);
}
}
void
malloc_zone_log(malloc_zone_t *zone, void *address)
{
if (!zone) {
unsigned index = 0;
while (index < malloc_num_zones) {
zone = malloc_zones[index++];
zone->introspect->log(zone, address);
}
} else {
zone->introspect->log(zone, address);
}
}
static void
DefaultMallocError(int x)
{
#if USE_SLEEP_RATHER_THAN_ABORT
malloc_printf("*** error %d\n", x);
sleep(3600);
#else
_SIMPLE_STRING b = _simple_salloc();
if (b) {
_simple_sprintf(b, "*** error %d", x);
malloc_printf("%s\n", _simple_string(b));
_os_set_crash_log_message_dynamic(_simple_string(b));
} else {
_malloc_printf(MALLOC_PRINTF_NOLOG, "*** error %d", x);
_os_set_crash_log_message("*** DefaultMallocError called");
}
abort();
#endif
}
void (*malloc_error(void (*func)(int)))(int)
{
return DefaultMallocError;
}
static void
_malloc_lock_all(void (*callout)(void))
{
unsigned index = 0;
MALLOC_LOCK();
while (index < malloc_num_zones) {
malloc_zone_t *zone = malloc_zones[index++];
zone->introspect->force_lock(zone);
}
callout();
}
static void
_malloc_unlock_all(void (*callout)(void))
{
unsigned index = 0;
callout();
while (index < malloc_num_zones) {
malloc_zone_t *zone = malloc_zones[index++];
zone->introspect->force_unlock(zone);
}
MALLOC_UNLOCK();
}
static void
_malloc_reinit_lock_all(void (*callout)(void))
{
unsigned index = 0;
callout();
while (index < malloc_num_zones) {
malloc_zone_t *zone = malloc_zones[index++];
if (zone->version < 9) { zone->introspect->force_unlock(zone);
} else {
zone->introspect->reinit_lock(zone);
}
}
MALLOC_REINIT_LOCK();
}
void
_malloc_fork_prepare(void)
{
return _malloc_lock_all(&__stack_logging_fork_prepare);
}
void
_malloc_fork_parent(void)
{
return _malloc_unlock_all(&__stack_logging_fork_parent);
}
void
_malloc_fork_child(void)
{
#if CONFIG_NANOZONE
if (_malloc_initialize_pred && _malloc_engaged_nano) {
nano_forked_zone((nanozone_t *)inline_malloc_default_zone());
}
#endif
return _malloc_reinit_lock_all(&__stack_logging_fork_child);
}
struct mstats
mstats(void)
{
malloc_statistics_t s;
struct mstats m;
malloc_zone_statistics(NULL, &s);
m.bytes_total = s.size_allocated;
m.chunks_used = s.blocks_in_use;
m.bytes_used = s.size_in_use;
m.chunks_free = 0;
m.bytes_free = m.bytes_total - m.bytes_used;
return (m);
}
boolean_t
malloc_zone_enable_discharge_checking(malloc_zone_t *zone)
{
if (zone->version < 7) { return FALSE;
}
if (NULL == zone->introspect->enable_discharge_checking) {
return FALSE;
}
return zone->introspect->enable_discharge_checking(zone);
}
void
malloc_zone_disable_discharge_checking(malloc_zone_t *zone)
{
if (zone->version < 7) { return;
}
if (NULL == zone->introspect->disable_discharge_checking) {
return;
}
zone->introspect->disable_discharge_checking(zone);
}
void
malloc_zone_discharge(malloc_zone_t *zone, void *memory)
{
if (NULL == zone) {
zone = malloc_zone_from_ptr(memory);
}
if (NULL == zone) {
return;
}
if (zone->version < 7) { return;
}
if (NULL == zone->introspect->discharge) {
return;
}
zone->introspect->discharge(zone, memory);
}
void
malloc_zone_enumerate_discharged_pointers(malloc_zone_t *zone, void (^report_discharged)(void *memory, void *info))
{
if (!zone) {
unsigned index = 0;
while (index < malloc_num_zones) {
zone = malloc_zones[index++];
if (zone->version < 7) {
continue;
}
if (NULL == zone->introspect->enumerate_discharged_pointers) {
continue;
}
zone->introspect->enumerate_discharged_pointers(zone, report_discharged);
}
} else {
if (zone->version < 7) {
return;
}
if (NULL == zone->introspect->enumerate_discharged_pointers) {
return;
}
zone->introspect->enumerate_discharged_pointers(zone, report_discharged);
}
}
#if PHASE_OUT_OLD_MALLOC
#error PHASE OUT THE FOLLOWING FUNCTIONS
#endif
void
set_malloc_singlethreaded(boolean_t single)
{
static boolean_t warned = 0;
if (!warned) {
#if PHASE_OUT_OLD_MALLOC
malloc_printf("*** OBSOLETE: set_malloc_singlethreaded(%d)\n", single);
#endif
warned = 1;
}
}
void
malloc_singlethreaded(void)
{
static boolean_t warned = 0;
if (!warned) {
malloc_printf("*** OBSOLETE: malloc_singlethreaded()\n");
warned = 1;
}
}
int
malloc_debug(int level)
{
malloc_printf("*** OBSOLETE: malloc_debug()\n");
return 0;
}