Loading...
--- libmalloc/libmalloc-283.40.1/src/malloc.c
+++ libmalloc/libmalloc-317.121.1/src/malloc.c
@@ -47,12 +47,18 @@
*/
int32_t malloc_num_zones = 0;
int32_t malloc_num_zones_allocated = 0;
-malloc_zone_t **malloc_zones = 0;
+malloc_zone_t **malloc_zones = (malloc_zone_t **)0xdeaddeaddeaddead;
malloc_logger_t *malloc_logger = NULL;
+
+static uint32_t initial_num_zones;
+static malloc_zone_t *initial_scalable_zone;
+static malloc_zone_t *initial_nano_zone;
static malloc_zone_t *initial_default_zone = NULL;
unsigned malloc_debug_flags = 0;
-boolean_t malloc_tracing_enabled = false;
+bool malloc_tracing_enabled = false;
+bool malloc_space_efficient_enabled = false;
+bool malloc_medium_space_efficient_enabled = false;
unsigned malloc_check_start = 0; // 0 means don't check
unsigned malloc_check_counter = 0;
@@ -60,8 +66,6 @@
static int malloc_check_sleep = 100; // default 100 second sleep
static int malloc_check_abort = 0; // default is to sleep, not abort
-
-static os_once_t _malloc_initialize_pred;
static
struct msl {
@@ -118,6 +122,7 @@
#define DEFAULT_MALLOC_ZONE_STRING "DefaultMallocZone"
#define DEFAULT_PUREGEABLE_ZONE_STRING "DefaultPurgeableMallocZone"
#define MALLOC_HELPER_ZONE_STRING "MallocHelperZone"
+#define MALLOC_PGUARD_ZONE_STRING "ProbGuardMallocZone"
MALLOC_NOEXPORT
unsigned int phys_ncpus;
@@ -137,6 +142,7 @@
static const char medium_enabled_boot_arg[] = "malloc_medium_zone";
static const char max_medium_magazines_boot_arg[] = "malloc_max_medium_magazines";
static const char medium_activation_threshold_boot_arg[] = "malloc_medium_activation_threshold";
+static const char medium_space_efficient_boot_arg[] = "malloc_medium_space_efficient";
#endif // CONFIG_MEDIUM_ALLOCATOR
/********* Utilities ************/
@@ -156,6 +162,7 @@
#endif // TARGET_OS_DRIVERKIT
void __malloc_init(const char *apple[]);
+static void _malloc_initialize(const char *apple[], const char *bootargs);
static int
__entropy_from_kernel(const char *str)
@@ -185,6 +192,32 @@
}
}
return idx;
+}
+
+#if TARGET_OS_OSX && defined(__x86_64__)
+static uint64_t
+__is_translated(void)
+{
+ return (*(uint64_t*)_COMM_PAGE_CPU_CAPABILITIES64) & kIsTranslated;
+}
+#endif /* TARGET_OS_OSX */
+
+
+#define LIBMALLOC_EXPERIMENT_FACTORS_KEY "MallocExperiment="
+#define LIBMALLOC_EXPERIMENT_DISABLE_MEDIUM (1ULL)
+static void
+__malloc_init_experiments(const char *str)
+{
+ uint64_t experiment_factors = 0;
+ str = strchr(str, '=');
+ if (str) {
+ experiment_factors = strtoull_l(str + 1, NULL, 16, NULL);
+ }
+ switch (experiment_factors) {
+ case LIBMALLOC_EXPERIMENT_DISABLE_MEDIUM:
+ magazine_medium_enabled = false;
+ break;
+ }
}
static void
@@ -223,6 +256,16 @@
}
#if CONFIG_MEDIUM_ALLOCATOR
+#if TARGET_OS_OSX
+#if defined(__x86_64__)
+ if (__is_translated()) {
+ magazine_medium_active_threshold = 0;
+ }
+#elif defined(__arm64__)
+ magazine_medium_active_threshold = 0;
+#endif
+#endif /* TARGET_OS_OSX */
+
flag = malloc_common_value_for_key_copy(bootargs, medium_enabled_boot_arg,
value_buf, sizeof(value_buf));
if (flag) {
@@ -258,10 +301,22 @@
"malloc_max_medium_magazines must be positive - ignored.\n");
}
}
+
+ flag = malloc_common_value_for_key_copy(bootargs,
+ medium_space_efficient_boot_arg, value_buf, sizeof(value_buf));
+ if (flag) {
+ const char *endp;
+ long value = malloc_common_convert_to_long(flag, &endp);
+ if (!*endp) {
+ malloc_medium_space_efficient_enabled = (value != 0);
+ }
+ }
#endif // CONFIG_MEDIUM_ALLOCATOR
}
-/* TODO: Investigate adding _malloc_initialize() into this libSystem initializer */
+extern malloc_zone_t *force_asan_init_if_present(void)
+ asm("_malloc_default_zone");
+
void
__malloc_init(const char *apple[])
{
@@ -270,18 +325,23 @@
// to temporarily allocate at least a page of memory to read the bootargs
// into.
char bootargs[1024] = { '\0' };
+ bool allow_bootargs = true;
+#if CONFIG_FEATUREFLAGS_SIMPLE
+ allow_bootargs &= os_feature_enabled_simple(libmalloc, EnableBootArgs, false);
+#endif
+#if defined(_COMM_PAGE_DEV_FIRM)
+ allow_bootargs &= !!*((uint32_t *)_COMM_PAGE_DEV_FIRM);
+#endif // _COMM_PAGE_DEV_FIRM
+
size_t len = sizeof(bootargs) - 1;
- if (!sysctlbyname("kern.bootargs", bootargs, &len, NULL, 0) && len > 0) {
+ if (allow_bootargs &&
+ !sysctlbyname("kern.bootargs", bootargs, &len, NULL, 0) &&
+ len > 0) {
bootargs[len + 1] = '\0';
}
-#if CONFIG_NANOZONE
- // TODO: envp should be passed down from Libsystem
- const char **envp = (const char **)*_NSGetEnviron();
- nano_common_init(envp, apple, bootargs);
-#endif
-
const char **p;
+ const char *malloc_experiments = NULL;
for (p = apple; p && *p; p++) {
if (strstr(*p, "malloc_entropy") == *p) {
int count = __entropy_from_kernel(*p);
@@ -290,7 +350,9 @@
if (sizeof(malloc_entropy) / sizeof(malloc_entropy[0]) == count) {
_malloc_entropy_initialized = true;
}
- break;
+ }
+ if (strstr(*p, LIBMALLOC_EXPERIMENT_FACTORS_KEY) == *p) {
+ malloc_experiments = *p;
}
}
if (!_malloc_entropy_initialized) {
@@ -298,8 +360,36 @@
_malloc_entropy_initialized = true;
}
+ if (malloc_experiments) {
+ __malloc_init_experiments(malloc_experiments);
+ }
__malloc_init_from_bootargs(bootargs);
mvm_aslr_init();
+
+ /*
+ * This really is a renamed call to malloc_default_zone() which is
+ * interposable and interposed by asan, so that we trigger the lazy
+ * initialization of asan _BEFORE_ _malloc_initialize().
+ *
+ * If we do it after, then _malloc_initialize() then ASAN will replace
+ * the system allocator too late and bad things happen.
+ */
+ force_asan_init_if_present();
+
+ _malloc_initialize(apple, bootargs);
+}
+
+static void register_pgm_zone(bool internal_diagnostics);
+static void stack_logging_early_finished(const struct _malloc_late_init *funcs);
+
+// WARNING: The passed _malloc_late_init is a stack variable in
+// libSystem_initializer(). We must not hold on to it.
+void
+__malloc_late_init(const struct _malloc_late_init *mli)
+{
+ register_pgm_zone(mli->internal_diagnostics);
+ stack_logging_early_finished(mli);
+ initial_num_zones = malloc_num_zones;
}
MALLOC_NOEXPORT malloc_zone_t* lite_zone = NULL;
@@ -582,32 +672,37 @@
return default_zone;
}
}
-
- // The default zone is registered in malloc_zones[0]. There's no danger that it will ever be unregistered.
- // So don't advance the FRZ counter yet.
- malloc_zone_t *zone = malloc_zones[0];
- size_t size = zone->size(zone, ptr);
- if (size) { // Claimed by this zone?
- if (returned_size) {
- *returned_size = size;
- }
-
- // Asan and others replace the zone at position 0 with their own zone.
- // In that case just return that zone as they need this information.
- // Otherwise return the virtual default zone, not the actual zone in position 0.
- if (!has_default_zone0()) {
+
+ malloc_zone_t *zone;
+ size_t size;
+
+ // We assume that the initial zones will never be unregistered concurrently while this code is running so we can have
+ // a fast path without locking. Callers who really do unregister these (to install their own default zone) need to
+ // ensure they establish their zone setup during initialization and before entering a multi-threaded environment.
+ for (uint32_t i = 0; i < initial_num_zones; i++) {
+ zone = malloc_zones[i];
+ size = zone->size(zone, ptr);
+
+ if (size) { // Claimed by this zone?
+ if (returned_size) {
+ *returned_size = size;
+ }
+
+ // Asan and others replace the zone at position 0 with their own zone.
+ // In that case just return that zone as they need this information.
+ // Otherwise return the virtual default zone, not the actual zone in position 0.
+ if (i == 0 && has_default_zone0()) {
+ return default_zone;
+ }
+
return zone;
- } else {
- return default_zone;
}
}
int32_t volatile *pFRZCounter = pFRZCounterLive; // Capture pointer to the counter of the moment
OSAtomicIncrement32Barrier(pFRZCounter); // Advance this counter -- our thread is in FRZ
- unsigned index;
int32_t limit = *(int32_t volatile *)&malloc_num_zones;
- malloc_zone_t **zones = &malloc_zones[1];
// From this point on, FRZ is accessing the malloc_zones[] array without locking
// in order to avoid contention on common operations (such as non-default-zone free()).
@@ -624,8 +719,8 @@
// are still valid). It also ensures that all the pointers in the zones array are
// valid until it returns, so that a stale value in limit is not dangerous.
- for (index = 1; index < limit; ++index, ++zones) {
- zone = *zones;
+ for (uint32_t i = initial_num_zones; i < limit; i++) {
+ zone = malloc_zones[i];
size = zone->size(zone, ptr);
if (size) { // Claimed by this zone?
goto out;
@@ -758,20 +853,14 @@
// malloc_num_zones, protect_size);
}
-// To be used in _malloc_initialize_once() only, call that function instead.
+// This used to be called lazyily because it is using
+// dyld_process_is_restricted() before dyld_init() has run.
+//
+// However this function is safe to use, we keep this function separate
+// if we ever need to have a 2-stage init in the future.
static void
-_malloc_initialize(void *context __unused)
-{
- MALLOC_LOCK();
- unsigned n;
- malloc_zone_t *zone = NULL;
-
- if (!_malloc_entropy_initialized) {
- // Lazy initialization may occur before __malloc_init (rdar://27075409)
- // TODO: make this a fatal error
- malloc_report(ASL_LEVEL_ERR, "*** malloc was initialized without entropy\n");
- }
-
+_malloc_initialize(const char *apple[], const char *bootargs)
+{
phys_ncpus = *(uint8_t *)(uintptr_t)_COMM_PAGE_PHYSICAL_CPUS;
logical_ncpus = *(uint8_t *)(uintptr_t)_COMM_PAGE_LOGICAL_CPUS;
@@ -811,70 +900,75 @@
}
set_flags_from_environment(); // will only set flags up to two times
- n = malloc_num_zones;
+
+#if CONFIG_NANOZONE
+ // TODO: envp should be passed down from Libsystem
+ const char **envp = (const char **)*_NSGetEnviron();
+ nano_common_init(envp, apple, bootargs);
+#endif
+
+ const uint32_t k_max_zones = 2;
+ malloc_zone_t *zone_stack[k_max_zones];
+ const char *name_stack[k_max_zones];
+ uint32_t num_zones = 0;
+
+ initial_scalable_zone = create_scalable_zone(0, malloc_debug_flags);
+ zone_stack[num_zones] = initial_scalable_zone;
+ name_stack[num_zones] = DEFAULT_MALLOC_ZONE_STRING;
+ num_zones++;
#if CONFIG_NANOZONE
nano_common_configure();
-
- malloc_zone_t *helper_zone = create_scalable_zone(0, malloc_debug_flags);
+
+ malloc_zone_t *helper_zone = zone_stack[num_zones - 1];
+ malloc_zone_t *nano_zone = NULL;
if (_malloc_engaged_nano == NANO_V2) {
- zone = nanov2_create_zone(helper_zone, malloc_debug_flags);
+ nano_zone = nanov2_create_zone(helper_zone, malloc_debug_flags);
} else if (_malloc_engaged_nano == NANO_V1) {
- zone = nano_create_zone(helper_zone, malloc_debug_flags);
- }
-
- if (zone) {
- malloc_zone_register_while_locked(zone);
- malloc_zone_register_while_locked(helper_zone);
-
- // Must call malloc_set_zone_name() *after* helper and nano are hooked together.
- 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);
+ nano_zone = nano_create_zone(helper_zone, malloc_debug_flags);
+ }
+
+ if (nano_zone) {
+ initial_nano_zone = nano_zone;
+ zone_stack[num_zones] = nano_zone;
+ name_stack[num_zones] = DEFAULT_MALLOC_ZONE_STRING;
+ name_stack[num_zones - 1] = MALLOC_HELPER_ZONE_STRING;
+ num_zones++;
+ }
#endif
- initial_default_zone = zone;
-
- if (n != 0) { // make the default first, for efficiency
- 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);
- }
+ MALLOC_ASSERT(num_zones <= k_max_zones);
+ initial_default_zone = zone_stack[num_zones - 1];
+
+ // 2 separate loops: malloc_set_zone_name already requires a working allocator.
+ for (int i = num_zones - 1; i >= 0; i--) malloc_zone_register_while_locked(zone_stack[i]);
+ for (int i = num_zones - 1; i >= 0; i--) malloc_set_zone_name(zone_stack[i], name_stack[i]);
+
+ initial_num_zones = malloc_num_zones;
// malloc_report(ASL_LEVEL_INFO, "%d registered zones\n", malloc_num_zones);
// malloc_report(ASL_LEVEL_INFO, "malloc_zones is at %p; malloc_num_zones is at %p\n", (unsigned)&malloc_zones,
// (unsigned)&malloc_num_zones);
- MALLOC_UNLOCK();
-}
-
-MALLOC_ALWAYS_INLINE
-static inline void
-_malloc_initialize_once(void)
-{
- os_once(&_malloc_initialize_pred, NULL, _malloc_initialize);
+}
+
+static void make_last_zone_default_zone(void);
+static void
+register_pgm_zone(bool internal_diagnostics)
+{
+ if (pguard_enabled(internal_diagnostics)) {
+ malloc_zone_t *wrapped_zone = malloc_zones[0];
+ malloc_zone_t *pgm_zone = pguard_create_zone(wrapped_zone);
+ malloc_zone_register_while_locked(pgm_zone);
+ make_last_zone_default_zone();
+ initial_default_zone = pgm_zone;
+ malloc_set_zone_name(pgm_zone, MALLOC_PGUARD_ZONE_STRING);
+ }
}
static inline malloc_zone_t *
inline_malloc_default_zone(void)
{
- _malloc_initialize_once();
// malloc_report(ASL_LEVEL_INFO, "In inline_malloc_default_zone with %d %d\n", malloc_num_zones, malloc_has_debug_zone);
return malloc_zones[0];
}
@@ -883,41 +977,6 @@
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_report(ASL_LEVEL_INFO, "In inline_malloc_default_scalable_zone with %d %d\n", malloc_num_zones,
- // malloc_has_debug_zone);
-
- 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_report(ASL_LEVEL_ERR, "*** malloc_default_scalable_zone() failed to find 'DefaultMallocZone'\n");
- return NULL; // FIXME: abort() instead?
}
static void *
@@ -980,7 +1039,7 @@
// PR_7288598: Must pass a *scalable* zone (szone) as the helper for create_purgeable_zone().
// Take care that the zone so obtained is not subject to interposing.
//
- malloc_zone_t *tmp = create_purgeable_zone(0, inline_malloc_default_scalable_zone(), malloc_debug_flags);
+ malloc_zone_t *tmp = create_purgeable_zone(0, initial_scalable_zone, malloc_debug_flags);
malloc_zone_register(tmp);
malloc_set_zone_name(tmp, DEFAULT_PUREGEABLE_ZONE_STRING);
if (!OSAtomicCompareAndSwapPtrBarrier(NULL, tmp, (void**)&dpz)) {
@@ -1008,6 +1067,7 @@
malloc_debug_flags = MALLOC_ABORT_ON_CORRUPTION;
}
#endif
+
/*
* Given that all environment variables start with "Malloc" we optimize by scanning quickly
* first the environment, therefore avoiding repeated calls to getenv().
@@ -1039,19 +1099,32 @@
return;
}
- if (getenv("MallocGuardEdges")) {
- malloc_debug_flags |= MALLOC_ADD_GUARD_PAGES;
- malloc_report(ASL_LEVEL_INFO, "protecting edges\n");
- if (getenv("MallocDoNotProtectPrelude")) {
- malloc_debug_flags |= MALLOC_DONT_PROTECT_PRELUDE;
- malloc_report(ASL_LEVEL_INFO, "... but not protecting prelude guard page\n");
- }
- if (getenv("MallocDoNotProtectPostlude")) {
- malloc_debug_flags |= MALLOC_DONT_PROTECT_POSTLUDE;
- malloc_report(ASL_LEVEL_INFO, "... but not protecting postlude guard page\n");
- }
- }
-
+ flag = getenv("MallocGuardEdges");
+ if (flag) {
+ if (!strcmp(flag, "all")) {
+ // "MallocGuardEdges=all" adds guard page(s) for every region.
+ // Do not do this on 32-bit platforms because there is insufficient
+ // address space. These pages are always protected.
+#if MALLOC_TARGET_64BIT
+ malloc_debug_flags |= MALLOC_GUARD_ALL | MALLOC_ADD_GUARD_PAGE_FLAGS;
+ malloc_debug_flags &= ~(MALLOC_DONT_PROTECT_PRELUDE|MALLOC_DONT_PROTECT_POSTLUDE);
+ malloc_report(ASL_LEVEL_INFO, "adding guard pages to all regions\n");
+#endif // MALLOC_TARGET_64BIT
+ } else {
+ malloc_debug_flags |= MALLOC_ADD_GUARD_PAGE_FLAGS;
+ malloc_debug_flags &= ~MALLOC_GUARD_ALL;
+ malloc_report(ASL_LEVEL_INFO, "adding guard pages for large allocator blocks\n");
+ if (getenv("MallocDoNotProtectPrelude")) {
+ malloc_debug_flags |= MALLOC_DONT_PROTECT_PRELUDE;
+ malloc_report(ASL_LEVEL_INFO, "... but not protecting prelude guard page\n");
+ }
+ if (getenv("MallocDoNotProtectPostlude")) {
+ malloc_debug_flags |= MALLOC_DONT_PROTECT_POSTLUDE;
+ malloc_report(ASL_LEVEL_INFO, "... but not protecting postlude guard page\n");
+ }
+ }
+ }
+
if (getenv("MallocScribble")) {
malloc_debug_flags |= MALLOC_DO_SCRIBBLE;
malloc_report(ASL_LEVEL_INFO, "enabling scribbling to detect mods to free blocks\n");
@@ -1149,6 +1222,40 @@
}
}
+ flag = getenv("MallocLargeDisableASLR");
+ if (flag) {
+ uint64_t value = (uint64_t)strtoull(flag, NULL, 0);
+ if (value == 0) {
+ malloc_report(ASL_LEVEL_INFO, "Enabling ASLR slide on large allocations\n");
+ malloc_debug_flags &= ~DISABLE_LARGE_ASLR;
+ } else if (value != 0) {
+ malloc_report(ASL_LEVEL_INFO, "Disabling ASLR slide on large allocations\n");
+ malloc_debug_flags |= DISABLE_LARGE_ASLR;
+ }
+ }
+
+#if CONFIG_AGGRESSIVE_MADVISE || CONFIG_LARGE_CACHE
+ // convenience flag to configure policies usually associated with memory-constrained platforms (iOS)
+ // that trade some amount of time efficiency for space efficiency
+ flag = getenv("MallocSpaceEfficient");
+ if (flag) {
+ const char *endp;
+ long value = malloc_common_convert_to_long(flag, &endp);
+ if (!*endp && endp != flag && (value == 0 || value == 1)) {
+#if CONFIG_AGGRESSIVE_MADVISE
+ aggressive_madvise_enabled = (value == 1);
+#endif // CONFIG_AGGRESSIVE_MADVISE
+#if CONFIG_LARGE_CACHE
+ large_cache_enabled = (value == 0);
+#endif // CONFIG_LARGE_CACHE
+ malloc_space_efficient_enabled = (value == 1);
+ // consider disabling medium magazine if aggressive madvise is not sufficient
+ } else {
+ malloc_report(ASL_LEVEL_ERR, "MallocSpaceEfficient must be 0 or 1.\n");
+ }
+ }
+#endif // CONFIG_AGGRESSIVE_MADVISE || CONFIG_LARGE_CACHE
+
#if CONFIG_MEDIUM_ALLOCATOR
flag = getenv("MallocMediumZone");
if (flag) {
@@ -1171,6 +1278,23 @@
magazine_medium_active_threshold = value;
malloc_report(ASL_LEVEL_INFO, "Medium activation threshold set to %lly\n", magazine_medium_active_threshold);
}
+ }
+
+ flag = getenv("MallocMediumSpaceEfficient");
+ if (flag) {
+ uint64_t value = (uint64_t)strtoull(flag, NULL, 0);
+ if (value == 0) {
+ malloc_medium_space_efficient_enabled = false;
+ } else if (value == 1) {
+ malloc_medium_space_efficient_enabled = true;
+ }
+ }
+
+ if (malloc_medium_space_efficient_enabled && malloc_space_efficient_enabled) {
+ // Bring down MallocMaxMediumMagazines to only a single magazine in
+ // space-efficent processes but do this before the envvar so that it
+ // can still be overridden at the command line.
+ max_medium_magazines = 1;
}
flag = getenv("MallocMaxMediumMagazines");
@@ -1194,6 +1318,32 @@
}
}
#endif // CONFIG_MEDIUM_ALLOCATOR
+
+#if CONFIG_AGGRESSIVE_MADVISE
+ flag = getenv("MallocAggressiveMadvise");
+ if (flag) {
+ const char *endp;
+ long value = malloc_common_convert_to_long(flag, &endp);
+ if (!*endp && endp != flag && (value == 0 || value == 1)) {
+ aggressive_madvise_enabled = (value == 1);
+ } else {
+ malloc_report(ASL_LEVEL_ERR, "MallocAggressiveMadvise must be 0 or 1.\n");
+ }
+ }
+#endif // CONFIG_AGGRESSIVE_MADVISE
+
+#if CONFIG_LARGE_CACHE
+ flag = getenv("MallocLargeCache");
+ if (flag) {
+ const char *endp;
+ long value = malloc_common_convert_to_long(flag, &endp);
+ if (!*endp && endp != flag && (value == 0 || value == 1)) {
+ large_cache_enabled = (value == 1);
+ } else {
+ malloc_report(ASL_LEVEL_ERR, "MallocLargeCache must be 0 or 1.\n");
+ }
+ }
+#endif // CONFIG_LARGE_CACHE
#if CONFIG_RECIRC_DEPOT
flag = getenv("MallocRecircRetainedRegions");
@@ -1239,10 +1389,27 @@
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;
+}
+
+static void
+make_last_zone_default_zone(void)
+{
+ unsigned protect_size = malloc_num_zones_allocated * sizeof(malloc_zone_t *);
+ mprotect(malloc_zones, protect_size, PROT_READ | PROT_WRITE);
+
+ malloc_zone_t *last_zone = malloc_zones[malloc_num_zones - 1];
+
+ // assert(zone == malloc_zones[malloc_num_zones - 1];
+ for (int i = malloc_num_zones - 1; i > 0; --i) {
+ malloc_zones[i] = malloc_zones[i - 1];
+ }
+ malloc_zones[0] = last_zone;
+
+ mprotect(malloc_zones, protect_size, PROT_READ);
}
/*
@@ -1253,9 +1420,7 @@
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();
@@ -1270,16 +1435,7 @@
}
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);
-
- // assert(zone == malloc_zones[malloc_num_zones - 1];
- 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);
+ make_last_zone_default_zone();
MALLOC_UNLOCK();
}
@@ -1364,9 +1520,13 @@
/********* Block creation and manipulation ************/
+__attribute__((cold, noinline))
static void
internal_check(void)
{
+ if (malloc_check_counter++ < malloc_check_start) {
+ return;
+ }
if (malloc_zone_check(NULL)) {
if (!frames) {
vm_allocate(mach_task_self(), (void *)&frames, vm_page_size, 1);
@@ -1376,90 +1536,141 @@
malloc_check_start += malloc_check_each;
}
+__options_decl(malloc_zone_options_t, unsigned, {
+ MZ_NONE = 0x0,
+ MZ_POSIX = 0x1,
+ MZ_C11 = 0x2,
+});
+
+static inline void
+malloc_set_errno_fast(malloc_zone_options_t mzo, int err)
+{
+ if (mzo & MZ_POSIX) {
+#if TARGET_OS_SIMULATOR
+ errno = err;
+#else
+ (*_pthread_errno_address_direct()) = err;
+#endif
+ }
+}
+
+MALLOC_NOINLINE
+static void *
+_malloc_zone_malloc(malloc_zone_t *zone, size_t size, malloc_zone_options_t mzo)
+{
+ MALLOC_TRACE(TRACE_malloc | DBG_FUNC_START, (uintptr_t)zone, size, 0, 0);
+
+ void *ptr = NULL;
+
+ if (malloc_check_start) {
+ internal_check();
+ }
+ if (size > MALLOC_ABSOLUTE_MAX_SIZE) {
+ goto out;
+ }
+
+ ptr = zone->malloc(zone, size); // if lite zone is passed in then we still call the lite methods
+
+ if (os_unlikely(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);
+out:
+ if (os_unlikely(ptr == NULL)) {
+ malloc_set_errno_fast(mzo, ENOMEM);
+ }
+ return ptr;
+}
+
void *
malloc_zone_malloc(malloc_zone_t *zone, size_t size)
{
- MALLOC_TRACE(TRACE_malloc | DBG_FUNC_START, (uintptr_t)zone, size, 0, 0);
+ return _malloc_zone_malloc(zone, size, MZ_NONE);
+}
+
+MALLOC_NOINLINE
+static void *
+_malloc_zone_calloc(malloc_zone_t *zone, size_t num_items, size_t size,
+ malloc_zone_options_t mzo)
+{
+ MALLOC_TRACE(TRACE_calloc | DBG_FUNC_START, (uintptr_t)zone, num_items, size, 0);
void *ptr;
- if (malloc_check_start && (malloc_check_counter++ >= malloc_check_start)) {
+ if (malloc_check_start) {
+ internal_check();
+ }
+
+ ptr = zone->calloc(zone, num_items, size);
+
+ if (os_unlikely(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);
+ }
+
+ MALLOC_TRACE(TRACE_calloc | DBG_FUNC_END, (uintptr_t)zone, num_items, size, (uintptr_t)ptr);
+ if (os_unlikely(ptr == NULL)) {
+ malloc_set_errno_fast(mzo, ENOMEM);
+ }
+ return ptr;
+}
+
+void *
+malloc_zone_calloc(malloc_zone_t *zone, size_t num_items, size_t size)
+{
+ return _malloc_zone_calloc(zone, num_items, size, MZ_NONE);
+}
+
+MALLOC_NOINLINE
+static void *
+_malloc_zone_valloc(malloc_zone_t *zone, size_t size, malloc_zone_options_t mzo)
+{
+ MALLOC_TRACE(TRACE_valloc | DBG_FUNC_START, (uintptr_t)zone, size, 0, 0);
+
+ void *ptr = NULL;
+ if (malloc_check_start) {
+ internal_check();
+ }
+ if (size > MALLOC_ABSOLUTE_MAX_SIZE) {
+ goto out;
+ }
+
+ ptr = zone->valloc(zone, size);
+
+ if (os_unlikely(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_valloc | DBG_FUNC_END, (uintptr_t)zone, size, (uintptr_t)ptr, 0);
+out:
+ if (os_unlikely(ptr == NULL)) {
+ malloc_set_errno_fast(mzo, ENOMEM);
+ }
+ return ptr;
+}
+
+void *
+malloc_zone_valloc(malloc_zone_t *zone, size_t size)
+{
+ return _malloc_zone_valloc(zone, size, MZ_NONE);
+}
+
+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) {
internal_check();
}
if (size > MALLOC_ABSOLUTE_MAX_SIZE) {
return NULL;
}
- ptr = zone->malloc(zone, size); // if lite zone is passed in then we still call the lite methods
-
-
- 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)
-{
- MALLOC_TRACE(TRACE_calloc | DBG_FUNC_START, (uintptr_t)zone, num_items, size, 0);
-
- void *ptr;
- if (malloc_check_start && (malloc_check_counter++ >= malloc_check_start)) {
- internal_check();
- }
-
- 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);
- }
-
- MALLOC_TRACE(TRACE_calloc | DBG_FUNC_END, (uintptr_t)zone, num_items, size, (uintptr_t)ptr);
- return ptr;
-}
-
-void *
-malloc_zone_valloc(malloc_zone_t *zone, size_t size)
-{
- MALLOC_TRACE(TRACE_valloc | 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->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);
- }
-
- MALLOC_TRACE(TRACE_valloc | DBG_FUNC_END, (uintptr_t)zone, size, (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) {
+ if (os_unlikely(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);
}
@@ -1472,10 +1683,10 @@
{
MALLOC_TRACE(TRACE_free, (uintptr_t)zone, (uintptr_t)ptr, (ptr) ? *(uintptr_t*)ptr : 0, 0);
- if (malloc_logger) {
+ if (os_unlikely(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)) {
+ if (malloc_check_start) {
internal_check();
}
@@ -1487,10 +1698,10 @@
{
MALLOC_TRACE(TRACE_free, (uintptr_t)zone, (uintptr_t)ptr, size, (ptr && size) ? *(uintptr_t*)ptr : 0);
- if (malloc_logger) {
+ if (os_unlikely(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)) {
+ if (malloc_check_start) {
internal_check();
}
@@ -1507,37 +1718,58 @@
}
}
+MALLOC_NOINLINE
+static void *
+_malloc_zone_memalign(malloc_zone_t *zone, size_t alignment, size_t size,
+ malloc_zone_options_t mzo)
+{
+ MALLOC_TRACE(TRACE_memalign | DBG_FUNC_START, (uintptr_t)zone, alignment, size, 0);
+
+ void *ptr = NULL;
+ int err = ENOMEM;
+ if (zone->version < 5) { // Version must be >= 5 to look at the new memalign field.
+ goto out;
+ }
+ if (malloc_check_start) {
+ internal_check();
+ }
+ if (size > MALLOC_ABSOLUTE_MAX_SIZE) {
+ goto out;
+ }
+ if (alignment < sizeof(void *) || // excludes 0 == alignment
+ 0 != (alignment & (alignment - 1))) { // relies on sizeof(void *) being a power of two.
+ err = EINVAL;
+ goto out;
+ }
+ if ((mzo & MZ_C11) && (size & (alignment - 1)) != 0) { /* C11 requires size to be a multiple of alignment */
+ err = EINVAL;
+ goto out;
+ }
+
+ if (!(zone->memalign)) {
+ goto out;
+ }
+ ptr = zone->memalign(zone, alignment, size);
+
+ if (os_unlikely(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);
+
+out:
+ if (os_unlikely(ptr == NULL)) {
+ if (mzo & MZ_POSIX) {
+ malloc_set_errno_fast(mzo, err);
+ }
+ }
+ return ptr;
+}
+
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) { // Version must be >= 5 to look at the new memalign field.
- 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 *) || // excludes 0 == alignment
- 0 != (alignment & (alignment - 1))) { // relies on sizeof(void *) being a power of two.
- 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;
+ return _malloc_zone_memalign(zone, alignment, size, MZ_NONE);
}
boolean_t
@@ -1548,7 +1780,7 @@
return false;
}
- if (malloc_check_start && (malloc_check_counter++ >= malloc_check_start)) {
+ if (malloc_check_start) {
internal_check();
}
@@ -1598,6 +1830,10 @@
--malloc_num_zones;
mprotect(malloc_zones, protect_size, PROT_READ);
+
+ // MAX(num_zones, 1) enables the fast path in find_registered_zone() for zone 0 even
+ // if it is a custom zone, e.g., ASan and user zones.
+ initial_num_zones = MIN(MAX(malloc_num_zones, 1), initial_num_zones);
// Exchange the roles of the FRZ counters. The counter that has captured the number of threads presently
// executing *inside* find_registered_zone is swapped with the counter drained to zero last time through.
@@ -1631,7 +1867,7 @@
}
if (name) {
size_t buflen = strlen(name) + 1;
- newName = malloc_zone_malloc(z, buflen);
+ newName = _malloc_zone_malloc(z, buflen, MZ_NONE);
if (newName) {
strlcpy(newName, name, buflen);
z->zone_name = (const char *)newName;
@@ -1654,39 +1890,20 @@
void *
malloc(size_t size)
{
- void *retval;
- retval = malloc_zone_malloc(default_zone, size);
- if (retval == NULL) {
- errno = ENOMEM;
- }
- return retval;
+ return _malloc_zone_malloc(default_zone, size, MZ_POSIX);
}
void *
aligned_alloc(size_t alignment, size_t size)
{
- if (alignment < sizeof(void *) || !powerof2(alignment) || /* those are implementation requirements */
- (size & (alignment - 1)) != 0) { /* C11 requires size to be a multiple of alignment */
- errno = EINVAL;
- return NULL;
- }
-
- void *retval = malloc_zone_memalign(default_zone, alignment, size);
- if (retval == NULL) {
- errno = ENOMEM;
- }
- return retval;
+ return _malloc_zone_memalign(default_zone, alignment, size,
+ MZ_POSIX | MZ_C11);
}
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;
+ return _malloc_zone_calloc(default_zone, num_items, size, MZ_POSIX);
}
void
@@ -1745,7 +1962,7 @@
}
if (retval == NULL) {
- errno = ENOMEM;
+ malloc_set_errno_fast(MZ_POSIX, ENOMEM);
} else if (new_size == 0) {
free(in_ptr);
}
@@ -1755,13 +1972,7 @@
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;
+ return _malloc_zone_valloc(default_zone, size, MZ_POSIX);
}
extern void
@@ -1844,9 +2055,11 @@
return true;
}
- // Next, try the default zone, which is always present.
- if (malloc_zone_claimed_address(malloc_zones[0], ptr)) {
- return true;
+ // Next, try the initial zones.
+ for (uint32_t i = 0; i < initial_num_zones; i++) {
+ if (malloc_zone_claimed_address(malloc_zones[i], ptr)) {
+ return true;
+ }
}
// Try all the other zones. Increment the FRZ barrier so that we can
@@ -1856,10 +2069,9 @@
OSAtomicIncrement32Barrier(pFRZCounter);
int32_t limit = *(int32_t volatile *)&malloc_num_zones;
- malloc_zone_t **zones = &malloc_zones[1];
boolean_t result = false;
- for (unsigned index = 1; index < limit; ++index, ++zones) {
- malloc_zone_t *zone = *zones;
+ for (uint32_t i = initial_num_zones; i < limit; i++) {
+ malloc_zone_t *zone = malloc_zones[i];
if (malloc_zone_claimed_address(zone, ptr)) {
result = true;
break;
@@ -1874,7 +2086,7 @@
reallocarray(void * in_ptr, size_t nmemb, size_t size){
size_t alloc_size;
if (os_mul_overflow(nmemb, size, &alloc_size)){
- errno = ENOMEM;
+ malloc_set_errno_fast(MZ_POSIX, ENOMEM);
return NULL;
}
return realloc(in_ptr, alloc_size);
@@ -1884,7 +2096,7 @@
reallocarrayf(void * in_ptr, size_t nmemb, size_t size){
size_t alloc_size;
if (os_mul_overflow(nmemb, size, &alloc_size)){
- errno = ENOMEM;
+ malloc_set_errno_fast(MZ_POSIX, ENOMEM);
return NULL;
}
return reallocf(in_ptr, alloc_size);
@@ -1969,11 +2181,15 @@
malloc_zone_pressure_relief(0, 0);
}
- if ( ((event & NOTE_MEMORYSTATUS_MSL_STATUS) != 0 && (event & ~NOTE_MEMORYSTATUS_MSL_STATUS) == 0) ||
- (event & (NOTE_MEMORYSTATUS_PROC_LIMIT_WARN | NOTE_MEMORYSTATUS_PROC_LIMIT_CRITICAL | NOTE_MEMORYSTATUS_PRESSURE_CRITICAL)))
- {
+ if ((event & NOTE_MEMORYSTATUS_MSL_STATUS) != 0 && (event & ~NOTE_MEMORYSTATUS_MSL_STATUS) == 0) {
malloc_register_stack_logger();
}
+
+#if ENABLE_MEMORY_RESOURCE_EXCEPTION_HANDLING
+ if (event & (NOTE_MEMORYSTATUS_PROC_LIMIT_WARN | NOTE_MEMORYSTATUS_PROC_LIMIT_CRITICAL | NOTE_MEMORYSTATUS_PRESSURE_CRITICAL)) {
+ malloc_register_stack_logger();
+ }
+#endif // ENABLE_MEMORY_RESOURCE_EXCEPTION_HANDLING
if (msl.handle_memory_event) {
// Let MSL see the event.
@@ -2028,12 +2244,12 @@
if (!zone->batch_malloc) {
return 0;
}
- if (malloc_check_start && (malloc_check_counter++ >= malloc_check_start)) {
+ if (malloc_check_start) {
internal_check();
}
unsigned batched = zone->batch_malloc(zone, size, results, num_requested);
- if (malloc_logger) {
+ if (os_unlikely(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,
@@ -2047,10 +2263,10 @@
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)) {
+ if (malloc_check_start) {
internal_check();
}
- if (malloc_logger) {
+ if (os_unlikely(malloc_logger)) {
unsigned index = 0;
while (index < num) {
malloc_logger(
@@ -2302,11 +2518,11 @@
_malloc_fork_child(void)
{
#if CONFIG_NANOZONE
- if (_malloc_initialize_pred) {
+ if (_malloc_entropy_initialized) {
if (_malloc_engaged_nano == NANO_V2) {
- nanov2_forked_zone((nanozonev2_t *)inline_malloc_default_zone());
+ nanov2_forked_zone((nanozonev2_t *)initial_nano_zone);
} else if (_malloc_engaged_nano == NANO_V1) {
- nano_forked_zone((nanozone_t *)inline_malloc_default_zone());
+ nano_forked_zone((nanozone_t *)initial_nano_zone);
}
}
#endif
@@ -2444,8 +2660,8 @@
/* this is called from libsystem during initialization. */
-void
-__stack_logging_early_finished(const struct _malloc_functions *funcs)
+static void
+stack_logging_early_finished(const struct _malloc_late_init *funcs)
{
#if !TARGET_OS_DRIVERKIT
_dlopen = funcs->dlopen;
@@ -2507,9 +2723,9 @@
if (msl.dylib != NULL) {
return true;
}
- void *dylib = _dlopen("/System/Library/PrivateFrameworks/Alternate/MallocStackLogging.framework/MallocStackLogging", RTLD_GLOBAL);
+ void *dylib = _dlopen("/System/Library/PrivateFrameworks/MallocStackLogging.framework/MallocStackLogging", RTLD_GLOBAL);
if (dylib == NULL) {
- dylib = _dlopen("/System/Library/PrivateFrameworks/MallocStackLogging.framework/MallocStackLogging", RTLD_GLOBAL);
+ return false;
}
os_once(&_register_msl_dylib_pred, dylib, register_msl_dylib);
if (!msl.dylib) {