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--- Libc/Libc-498/gen/malloc.c
+++ Libc/Libc-825.26/gen/malloc.c
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 1999, 2006, 2007 Apple Inc. All rights reserved.
+ * Copyright (c) 1999, 2006-2008 Apple Inc. All rights reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
@@ -22,12 +22,13 @@
*/
#include <pthread_internals.h>
+#include "magmallocProvider.h"
+#include <mach-o/dyld.h> /* for NSVersionOfLinkTimeLibrary() */
#import <stdlib.h>
#import <stdio.h>
#import <string.h>
#import <unistd.h>
-#import <objc/zone.h>
#import <malloc/malloc.h>
#import <fcntl.h>
#import <crt_externs.h>
@@ -35,11 +36,15 @@
#import <pthread_internals.h>
#import <limits.h>
#import <dlfcn.h>
+#import <mach/mach_vm.h>
+#import <mach/mach_init.h>
+#import <sys/mman.h>
#import "scalable_malloc.h"
#import "stack_logging.h"
#import "malloc_printf.h"
#import "_simple.h"
+#import "CrashReporterClient.h"
/*
* MALLOC_ABSOLUTE_MAX_SIZE - There are many instances of addition to a
@@ -56,16 +61,20 @@
#define USE_SLEEP_RATHER_THAN_ABORT 0
-#define INITIAL_ZONES 8 // After this number, we reallocate for new zones
-
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);
__private_extern__ pthread_lock_t _malloc_lock = 0; // initialized in __libc_init
-static malloc_zone_t *initial_malloc_zones[INITIAL_ZONES] = {0};
-
-/* The following variables are exported for the benefit of performance tools */
+
+/* The following variables are exported for the benefit of performance tools
+ *
+ * It should always be safe to first read malloc_num_zones, then read
+ * malloc_zones without taking the lock, if only iteration is required and
+ * provided that when malloc_destroy_zone is called all prior operations on that
+ * zone are complete and no further calls referencing that zone can be made.
+ */
unsigned malloc_num_zones = 0;
-malloc_zone_t **malloc_zones = initial_malloc_zones;
+unsigned malloc_num_zones_allocated = 0;
+malloc_zone_t **malloc_zones = 0;
malloc_logger_t *malloc_logger = NULL;
unsigned malloc_debug_flags = 0;
@@ -89,12 +98,18 @@
* 3 - a new default zone has been created and another environment variable scan
*/
__private_extern__ int malloc_def_zone_state = 0;
-__private_extern__ malloc_zone_t *__zone0 = NULL;
static const char Malloc_Facility[] = "com.apple.Libsystem.malloc";
#define MALLOC_LOCK() LOCK(_malloc_lock)
#define MALLOC_UNLOCK() UNLOCK(_malloc_lock)
+
+/*
+ * Counters that coordinate zone destruction (in malloc_zone_unregister) with
+ * find_registered_zone (here abbreviated as FRZ).
+ */
+static int counterAlice = 0, counterBob = 0;
+static int *pFRZCounterLive= &counterAlice, *pFRZCounterDrain = &counterBob;
#define MALLOC_LOG_TYPE_ALLOCATE stack_logging_type_alloc
#define MALLOC_LOG_TYPE_DEALLOCATE stack_logging_type_dealloc
@@ -102,33 +117,93 @@
#define MALLOC_LOG_TYPE_CLEARED stack_logging_flag_cleared
/********* Utilities ************/
+__private_extern__ uint64_t malloc_entropy[2] = {0, 0};
+
+void __malloc_entropy_setup(const char *apple[]) __attribute__ ((visibility ("hidden")));
+
+static int
+__entropy_from_kernel(const char *str)
+{
+ unsigned long long val;
+ char tmp[20], *p;
+ int idx = 0;
+
+ /* Skip over key to the first value */
+ 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(tmp, NULL, 0);
+ malloc_entropy[idx] = (uint64_t)val;
+ idx++;
+ if ((str = strchr(str, ',')) != NULL)
+ str++;
+ }
+ return idx;
+}
+
+void
+__malloc_entropy_setup(const char *apple[])
+{
+ const char **p;
+ for (p = apple; p && *p; p++) {
+ if (strstr(*p, "malloc_entropy") == *p) {
+ if (sizeof(malloc_entropy)/sizeof(malloc_entropy[0]) == __entropy_from_kernel(*p))
+ return;
+ else
+ break;
+ }
+ }
+
+ malloc_entropy[0] = ((uint64_t)arc4random()) << 32 | ((uint64_t)arc4random());
+ malloc_entropy[1] = ((uint64_t)arc4random()) << 32 | ((uint64_t)arc4random());
+ return;
+}
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) {
- // Returns a zone which may contain ptr, or NULL.
- // Speed is critical for this function, so it is not guaranteed to return
- // the zone which contains ptr. For N zones, zones 1 through N - 1 are
- // checked to see if they contain ptr. If so, the zone containing ptr is
- // returned. Otherwise the last zone is returned, since it is the last zone
- // in which ptr may reside. Clients should call zone->size(ptr) on the
- // return value to determine whether or not ptr is an allocated object.
- // This behavior optimizes for the case where ptr is an allocated object,
- // and there is only one zone.
- unsigned index, limit = malloc_num_zones;
- if (limit == 0)
- return NULL;
+ // Returns a zone which contains ptr, else NULL
+
+ if (0 == malloc_num_zones) {
+ if (returned_size) *returned_size = 0;
+ return NULL;
+ }
+
+ // 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;
+ return zone;
+ }
+
+ int *pFRZCounter = pFRZCounterLive; // Capture pointer to the counter of the moment
+ __sync_fetch_and_add(pFRZCounter, 1); // Advance this counter -- our thread is in FRZ
- malloc_zone_t **zones = malloc_zones;
- for (index = 0; index < limit - 1; ++index, ++zones) {
- malloc_zone_t *zone = *zones;
- size_t size = zone->size(zone, ptr);
- if (size) {
+ unsigned index;
+ unsigned limit = 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) { // Claimed by this zone?
if (returned_size) *returned_size = size;
+ __sync_fetch_and_sub(pFRZCounter, 1); // our thread is leaving FRZ
return zone;
}
}
- return malloc_zones[index];
+ // Unclaimed by any zone.
+ if (returned_size) *returned_size = 0;
+ __sync_fetch_and_sub(pFRZCounter, 1); // our thread is leaving FRZ
+ return NULL;
}
__private_extern__ __attribute__((noinline)) void
@@ -137,30 +212,86 @@
// that will be called after an error message appears. It does not make
// sense for developers to call this function, so it is marked
// __private_extern__ to prevent it from becoming API.
+ MAGMALLOC_MALLOCERRORBREAK(); // DTrace USDT probe
+}
+
+__private_extern__ boolean_t __stack_logging_locked();
+
+__private_extern__ __attribute__((noinline)) __attribute__((used)) int
+malloc_gdb_po_unsafe(void) {
+ // In order to implement "po" other data formatters in gdb, the debugger
+ // calls functions that call malloc. The debugger will only run one thread
+ // of the program in this case, so if another thread is holding a zone lock,
+ // gdb may deadlock in this case.
+ //
+ // Iterate over the zones in malloc_zones, and call "trylock" on the zone
+ // lock. If trylock succeeds, unlock it, otherwise return "locked". Returns
+ // 0 == safe, 1 == locked/unsafe.
+
+ 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];
+
+ // Version must be >= 5 to look at the new introspection field.
+ if (zone->version < 5)
+ continue;
+
+ if (zone->introspect->zone_locked && zone->introspect->zone_locked(zone))
+ return 1;
+ }
+ return 0;
}
/********* Creation and destruction ************/
static void set_flags_from_environment(void);
-// malloc_zone_register_while_locked may drop the lock temporarily
static void
malloc_zone_register_while_locked(malloc_zone_t *zone) {
- /* Note that given the sequencing it is always safe to first get the number of zones, then get malloc_zones without taking the lock, if all you need is to iterate through the list */
- if (malloc_num_zones >= INITIAL_ZONES) {
- malloc_zone_t **zones = malloc_zones;
- malloc_zone_t *pzone = malloc_zones[0];
- boolean_t copy = malloc_num_zones == INITIAL_ZONES;
- if (copy) zones = NULL; // to avoid realloc on something not allocated
- MALLOC_UNLOCK();
- zones = pzone->realloc(pzone, zones, (malloc_num_zones + 1) * sizeof(malloc_zone_t *)); // we leak initial_malloc_zones, not worth tracking it
- MALLOC_LOCK();
- if (copy) memcpy(zones, malloc_zones, malloc_num_zones * sizeof(malloc_zone_t *));
- malloc_zones = zones;
- }
- malloc_zones[malloc_num_zones] = zone;
- malloc_num_zones++; // note that we do this after setting malloc_num_zones, so enumerations without taking the lock are safe
- // _malloc_printf(ASL_LEVEL_INFO, "Registered %p malloc_zones at address %p is %p [%d zones]\n", zone, &malloc_zones, malloc_zones, malloc_num_zones);
+ size_t protect_size;
+ unsigned i;
+
+ /* scan the list of zones, to see if this zone is already registered. If
+ * so, print an error message and return. */
+ 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 *);
+ size_t alloc_size = malloc_zones_size + vm_page_size;
+
+ malloc_zone_t **new_zones = mmap(0, alloc_size, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, VM_MAKE_TAG(VM_MEMORY_MALLOC), 0);
+
+ /* If there were previously allocated malloc zones, we need to copy them
+ * out of the previous array and into the new zones array */
+ if (malloc_zones)
+ memcpy(new_zones, malloc_zones, malloc_zones_size);
+
+ /* Update the malloc_zones pointer, which we leak if it was previously
+ * allocated, and the number of zones allocated */
+ protect_size = alloc_size;
+ malloc_zones = new_zones;
+ malloc_num_zones_allocated = alloc_size / sizeof(malloc_zone_t *);
+ } else {
+ /* If we don't need to reallocate zones, we need to briefly change the
+ * page protection the malloc zones to allow writes */
+ 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;
+
+ /* Finally, now that the zone is registered, disallow write access to the
+ * malloc_zones array */
+ mprotect(malloc_zones, protect_size, PROT_READ);
+ //_malloc_printf(ASL_LEVEL_INFO, "Registered malloc_zone %p in malloc_zones %p [%u zones, %u bytes]\n", zone, malloc_zones, malloc_num_zones, protect_size);
}
static void
@@ -174,17 +305,20 @@
set_flags_from_environment(); // will only set flags up to two times
n = malloc_num_zones;
zone = create_scalable_zone(0, malloc_debug_flags);
- //malloc_zone_register_while_locked may drop the lock temporarily
malloc_zone_register_while_locked(zone);
malloc_set_zone_name(zone, "DefaultMallocZone");
if (n != 0) { // make the default first, for efficiency
- malloc_zone_t *hold = malloc_zones[0];
- if(hold->zone_name && strcmp(hold->zone_name, "DefaultMallocZone") == 0) {
- free((void *)hold->zone_name);
- hold->zone_name = NULL;
- }
- malloc_zones[0] = malloc_zones[n];
- malloc_zones[n] = hold;
+ 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, "DefaultMallocZone") == 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_printf(ASL_LEVEL_INFO, "%d registered zones\n", malloc_num_zones);
// _malloc_printf(ASL_LEVEL_INFO, "malloc_zones is at %p; malloc_num_zones is at %p\n", (unsigned)&malloc_zones, (unsigned)&malloc_num_zones);
@@ -203,6 +337,47 @@
malloc_zone_t *
malloc_default_zone(void) {
return inline_malloc_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;
+
+ if (malloc_def_zone_state < 2) _malloc_initialize();
+ // _malloc_printf(ASL_LEVEL_INFO, "In inline_malloc_default_scalable_zone with %d %d\n", malloc_num_zones, malloc_has_debug_zone);
+
+ MALLOC_LOCK();
+ for (index = 0; index < malloc_num_zones; ++index) {
+ malloc_zone_t *z = malloc_zones[index];
+
+ if(z->zone_name && strcmp(z->zone_name, "DefaultMallocZone") == 0) {
+ MALLOC_UNLOCK();
+ return z;
+ }
+ }
+ MALLOC_UNLOCK();
+
+ malloc_printf("*** malloc_default_scalable_zone() failed to find 'DefaultMallocZone'\n");
+ return NULL; // FIXME: abort() instead?
+}
+
+malloc_zone_t *
+malloc_default_purgeable_zone(void) {
+ static malloc_zone_t *dpz;
+
+ if (!dpz) {
+ //
+ // 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_register(tmp);
+ malloc_set_zone_name(tmp, "DefaultPurgeableMallocZone");
+ if (!__sync_bool_compare_and_swap(&dpz, NULL, tmp))
+ malloc_destroy_zone(tmp);
+ }
+ return dpz;
}
// For debugging, allow stack logging to both memory and disk to compare their results.
@@ -225,7 +400,15 @@
close(malloc_debug_file);
malloc_debug_file = STDERR_FILENO;
}
- malloc_debug_flags = 0;
+#if __LP64__
+ malloc_debug_flags = SCALABLE_MALLOC_ABORT_ON_CORRUPTION; // Set always on 64-bit processes
+#else
+ int libSystemVersion = NSVersionOfLinkTimeLibrary("System");
+ if ((-1 != libSystemVersion) && ((libSystemVersion >> 16) < 126) /* Lion or greater */)
+ malloc_debug_flags = 0;
+ else
+ malloc_debug_flags = SCALABLE_MALLOC_ABORT_ON_CORRUPTION;
+#endif
stack_logging_enable_logging = 0;
stack_logging_dontcompact = 0;
malloc_logger = NULL;
@@ -259,7 +442,7 @@
}
}
if (getenv("MallocGuardEdges")) {
- malloc_debug_flags = SCALABLE_MALLOC_ADD_GUARD_PAGES;
+ malloc_debug_flags |= SCALABLE_MALLOC_ADD_GUARD_PAGES;
_malloc_printf(ASL_LEVEL_INFO, "protecting edges\n");
if (getenv("MallocDoNotProtectPrelude")) {
malloc_debug_flags |= SCALABLE_MALLOC_DONT_PROTECT_PRELUDE;
@@ -287,7 +470,7 @@
malloc_logger = (void *)val;
_malloc_printf(ASL_LEVEL_INFO, "recording stacks using recorder %p\n", malloc_logger);
} else if (strcmp(flag,"memory") == 0) {
- malloc_logger = stack_logging_log_stack;
+ malloc_logger = (malloc_logger_t *)stack_logging_log_stack;
_malloc_printf(ASL_LEVEL_INFO, "recording malloc stacks in memory using standard recorder\n");
} else if (strcmp(flag,"both") == 0) {
malloc_logger = stack_logging_log_stack_debug;
@@ -306,13 +489,23 @@
}
}
if (getenv("MallocScribble")) {
- malloc_debug_flags |= SCALABLE_MALLOC_DO_SCRIBBLE;
- _malloc_printf(ASL_LEVEL_INFO, "enabling scribbling to detect mods to free blocks\n");
+ malloc_debug_flags |= SCALABLE_MALLOC_DO_SCRIBBLE;
+ _malloc_printf(ASL_LEVEL_INFO, "enabling scribbling to detect mods to free blocks\n");
}
if (getenv("MallocErrorAbort")) {
- malloc_debug_flags |= SCALABLE_MALLOC_ABORT_ON_ERROR;
- _malloc_printf(ASL_LEVEL_INFO, "enabling abort() on bad malloc or free\n");
- }
+ malloc_debug_flags |= SCALABLE_MALLOC_ABORT_ON_ERROR;
+ _malloc_printf(ASL_LEVEL_INFO, "enabling abort() on bad malloc or free\n");
+ }
+#if __LP64__
+ /* initialization above forces SCALABLE_MALLOC_ABORT_ON_CORRUPTION of 64-bit processes */
+#else
+ flag = getenv("MallocCorruptionAbort");
+ if (flag && (flag[0] == '0')) { // Set from an environment variable in 32-bit processes
+ malloc_debug_flags &= ~SCALABLE_MALLOC_ABORT_ON_CORRUPTION;
+ } else if (flag) {
+ malloc_debug_flags |= SCALABLE_MALLOC_ABORT_ON_CORRUPTION;
+ }
+#endif
flag = getenv("MallocCheckHeapStart");
if (flag) {
malloc_check_start = strtoul(flag, NULL, 0);
@@ -351,13 +544,16 @@
"- 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"
- "- MallocErrorAbort to abort on a bad malloc or free\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"
"- MallocHelp - this help!\n");
}
}
@@ -372,25 +568,54 @@
return NULL;
}
if (malloc_def_zone_state < 2) _malloc_initialize();
- zone = create_scalable_zone(start_size, malloc_debug_flags);
+ zone = create_scalable_zone(start_size, flags | malloc_debug_flags);
malloc_zone_register(zone);
return zone;
}
+/*
+ * For use by CheckFix: establish a new default zone whose behavior is, apart from
+ * the use of death-row and per-CPU magazines, that of Leopard.
+ */
+void
+malloc_create_legacy_default_zone(void)
+{
+ malloc_zone_t *zone;
+ int i;
+
+ if (malloc_def_zone_state < 2) _malloc_initialize();
+ zone = create_legacy_scalable_zone(0, malloc_debug_flags);
+
+ MALLOC_LOCK();
+ malloc_zone_register_while_locked(zone);
+
+ //
+ // Establish the legacy scalable zone just created as the default zone.
+ //
+ malloc_zone_t *hold = malloc_zones[0];
+ if(hold->zone_name && strcmp(hold->zone_name, "DefaultMallocZone") == 0) {
+ malloc_set_zone_name(hold, NULL);
+ }
+ malloc_set_zone_name(zone, "DefaultMallocZone");
+
+ 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);
+ MALLOC_UNLOCK();
+}
+
void
malloc_destroy_zone(malloc_zone_t *zone) {
+ malloc_set_zone_name(zone, NULL); // Deallocate zone name wherever it may reside PR_7701095
malloc_zone_unregister(zone);
zone->destroy(zone);
-}
-
-/* called from the {put,set,unset}env routine */
-__private_extern__ void
-__malloc_check_env_name(const char *name)
-{
- MALLOC_LOCK();
- if(malloc_def_zone_state == 2 && strncmp(name, "Malloc", 6) == 0)
- malloc_def_zone_state = 1;
- MALLOC_UNLOCK();
}
/********* Block creation and manipulation ************/
@@ -400,19 +625,21 @@
static vm_address_t *frames = NULL;
static unsigned num_frames;
if (malloc_zone_check(NULL)) {
- _malloc_printf(ASL_LEVEL_NOTICE, "MallocCheckHeap: PASSED check at %dth operation\n", malloc_check_counter-1);
- if (!frames) vm_allocate(mach_task_self(), (void *)&frames, vm_page_size, 1);
- thread_stack_pcs(frames, vm_page_size/sizeof(vm_address_t) - 1, &num_frames);
+ if (!frames) vm_allocate(mach_task_self(), (void *)&frames, vm_page_size, 1);
+ thread_stack_pcs(frames, 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;
- _SIMPLE_STRING b = _simple_salloc();
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));
- _simple_sfree(b);
} else {
/*
* Should only get here if vm_allocate() can't get a single page of
@@ -429,8 +656,11 @@
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 (malloc_check_abort) {
+ CRSetCrashLogMessage(b ? _simple_string(b) : "*** 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);
@@ -455,7 +685,8 @@
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);
+ 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;
}
@@ -469,7 +700,9 @@
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);
+ 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;
}
@@ -483,7 +716,8 @@
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);
+ 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;
}
@@ -497,28 +731,61 @@
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);
+ 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);
return new_ptr;
}
void
malloc_zone_free(malloc_zone_t *zone, void *ptr) {
- 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_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) {
+ 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) {
- malloc_zone_t *zone;
if (!ptr)
return NULL;
- zone = find_registered_zone(ptr, NULL);
- if (zone && zone->size(zone, ptr))
- return zone;
- return NULL;
+ else
+ return find_registered_zone(ptr, NULL);
+}
+
+void *
+malloc_zone_memalign(malloc_zone_t *zone, size_t alignment, size_t size) {
+ void *ptr;
+ if (zone->version < 5) // Version must be >= 5 to look at the new memalign field.
+ return NULL;
+ if (!(zone->memalign))
+ 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;
+ }
+ 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);
+ return ptr;
}
/********* Functions for zone implementors ************/
@@ -533,15 +800,41 @@
void
malloc_zone_unregister(malloc_zone_t *z) {
unsigned index;
+
+ if (malloc_num_zones == 0)
+ return;
+
MALLOC_LOCK();
- index = malloc_num_zones;
- while (index--) {
- malloc_zone_t *zone = malloc_zones[index];
- if (zone == z) {
- malloc_zones[index] = malloc_zones[--malloc_num_zones];
- MALLOC_UNLOCK();
- return;
- }
+ for (index = 0; index < malloc_num_zones; ++index) {
+ if (z != malloc_zones[index])
+ continue;
+
+ // Modify the page to be allow write access, so that we can update the
+ // malloc_zones array.
+ size_t protect_size = malloc_num_zones_allocated * sizeof(malloc_zone_t *);
+ mprotect(malloc_zones, protect_size, PROT_READ | PROT_WRITE);
+
+ // If we found a match, replace it with the entry at the end of the list, shrink the list,
+ // and leave the end of the list intact to avoid racing with find_registered_zone().
+
+ malloc_zones[index] = malloc_zones[malloc_num_zones - 1];
+ --malloc_num_zones;
+
+ mprotect(malloc_zones, protect_size, PROT_READ);
+
+ // Exchange the roles of the FRZ counters. The counter that has captured the number of threads presently
+ // executing *inside* find_regiatered_zone is swapped with the counter drained to zero last time through.
+ // The former is then allowed to drain to zero while this thread yields.
+ int *p = pFRZCounterLive;
+ pFRZCounterLive = pFRZCounterDrain;
+ pFRZCounterDrain = p;
+ __sync_synchronize(); // Full memory barrier
+
+ while (0 != *pFRZCounterDrain) { pthread_yield_np(); }
+
+ MALLOC_UNLOCK();
+
+ return;
}
MALLOC_UNLOCK();
malloc_printf("*** malloc_zone_unregister() failed for %p\n", z);
@@ -550,13 +843,23 @@
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;
}
- newName = malloc_zone_malloc(z, strlen(name) + 1);
- strcpy(newName, name);
- z->zone_name = (const char *)newName;
+ 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 *
@@ -645,15 +948,33 @@
void
free(void *ptr) {
malloc_zone_t *zone;
- if (!ptr) return;
- zone = find_registered_zone(ptr, NULL);
- if (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 & (SCALABLE_MALLOC_ABORT_ON_CORRUPTION|SCALABLE_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);
+ CRSetCrashLogMessage(_simple_string(b));
+ } else {
+ CRSetCrashLogMessage("*** 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;
+ void *retval = NULL;
void *old_ptr;
malloc_zone_t *zone;
size_t old_size = 0;
@@ -671,18 +992,23 @@
retval = malloc_zone_malloc(inline_malloc_default_zone(), new_size);
} else {
zone = find_registered_zone(old_ptr, &old_size);
- if (zone && (old_size == 0))
- old_size = zone->size(zone, old_ptr);
- if (zone && (old_size >= new_size))
- return old_ptr;
- /*
- * if old_size is still 0 here, it means that either zone was NULL or
- * the call to zone->size() returned 0, indicating the pointer is not
- * not in that zone. In this case, just use the default zone.
- */
- if (old_size == 0)
- zone = inline_malloc_default_zone();
- retval = malloc_zone_realloc(zone, old_ptr, new_size);
+ 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 & (SCALABLE_MALLOC_ABORT_ON_CORRUPTION|SCALABLE_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);
+ CRSetCrashLogMessage(_simple_string(b));
+ } else {
+ CRSetCrashLogMessage("*** 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;
@@ -711,14 +1037,11 @@
size_t
malloc_size(const void *ptr) {
size_t size = 0;
- if (!ptr) return size;
- malloc_zone_t *zone = find_registered_zone(ptr, &size);
- /*
- * If we found a zone, and size is 0 then we need to check to see if that
- * zone contains ptr. If size is nonzero, then we know zone contains ptr.
- */
- if (zone && (size == 0))
- size = zone->size(zone, ptr);
+
+ if (!ptr)
+ return size;
+
+ (void)find_registered_zone(ptr, &size);
return size;
}
@@ -728,12 +1051,140 @@
return zone->introspect->good_size(zone, size);
}
+/*
+ * The posix_memalign() function shall allocate size bytes aligned on a boundary specified by alignment,
+ * and shall return a pointer to the allocated memory in memptr.
+ * The value of alignment shall be a multiple of sizeof( void *), that is also a power of two.
+ * Upon successful completion, the value pointed to by memptr shall be a multiple of alignment.
+ *
+ * Upon successful completion, posix_memalign() shall return zero; otherwise,
+ * an error number shall be returned to indicate the error.
+ *
+ * The posix_memalign() function shall fail if:
+ * EINVAL
+ * The value of the alignment parameter is not a power of two multiple of sizeof( void *).
+ * ENOMEM
+ * There is insufficient memory available with the requested alignment.
+ */
+
+int
+posix_memalign(void **memptr, size_t alignment, size_t size)
+{
+ void *retval;
+
+ /* POSIX is silent on NULL == memptr !?! */
+
+ retval = malloc_zone_memalign(inline_malloc_default_zone(), alignment, size);
+ if (retval == NULL) {
+ // To avoid testing the alignment constraints redundantly, we'll rely on the
+ // test made in malloc_zone_memalign to vet each request. Only if that test fails
+ // and returns NULL, do we arrive here to detect the bogus alignment and give the
+ // required EINVAL return.
+ if (alignment < sizeof( void *) || // excludes 0 == alignment
+ 0 != (alignment & (alignment - 1))) { // relies on sizeof(void *) being a power of two.
+ return EINVAL;
+ }
+ return ENOMEM;
+ } else {
+ *memptr = retval; // Set iff allocation succeeded
+ return 0;
+ }
+}
+
+static malloc_zone_t *
+find_registered_purgeable_zone(void *ptr) {
+ if (!ptr)
+ return NULL;
+
+ /*
+ * Look for a zone which contains ptr. If that zone does not have the purgeable malloc flag
+ * set, or the allocation is too small, do nothing. Otherwise, set the allocation volatile.
+ * FIXME: for performance reasons, we should probably keep a separate list of purgeable zones
+ * and only search those.
+ */
+ size_t size = 0;
+ malloc_zone_t *zone = find_registered_zone(ptr, &size);
+
+ /* FIXME: would really like a zone->introspect->flags->purgeable check, but haven't determined
+ * binary compatibility impact of changing the introspect struct yet. */
+ if (!zone)
+ return NULL;
+
+ /* Check to make sure pointer is page aligned and size is multiple of page size */
+ 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;
+}
+
+/* Returns true if ptr is valid. Ignore the return value from vm_purgeable_control and only report
+ * state. */
+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;
+}
+
+size_t malloc_zone_pressure_relief(malloc_zone_t *zone, size_t goal)
+{
+ if (!zone) {
+ unsigned index = 0;
+ size_t total = 0;
+
+ // Take lock to defend against malloc_destroy_zone()
+ 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) /* Greedy */
+ total += zone->pressure_relief(zone, 0);
+ else if (goal > total)
+ total += zone->pressure_relief(zone, goal - total);
+ else /* total >= goal */
+ break;
+ }
+ MALLOC_UNLOCK();
+ return total;
+ } else {
+ // Assumes zone is not destroyed for the duration of this call
+ if (zone->version < 8)
+ return 0;
+ if (NULL == zone->pressure_relief)
+ return 0;
+ return zone->pressure_relief(zone, goal);
+ }
+}
+
/********* Batch methods ************/
unsigned
malloc_zone_batch_malloc(malloc_zone_t *zone, size_t size, void **results, unsigned num_requested) {
unsigned (*batch_malloc)(malloc_zone_t *, size_t, void **, unsigned) = zone-> batch_malloc;
- if (! batch_malloc) return 0;
+ if (! batch_malloc)
+ return 0;
if (malloc_check_start && (malloc_check_counter++ >= malloc_check_start)) {
internal_check();
}
@@ -811,7 +1262,7 @@
// printf("malloc_get_all_zones succesfully found %d zones\n", 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", (unsigned)&zones_address);
+ malloc_printf("*** malloc_get_all_zones: error reading zones at %p\n", &zones_address);
return err;
}
// printf("malloc_get_all_zones succesfully read %d zones\n", num_zones);
@@ -896,10 +1347,19 @@
static void
DefaultMallocError(int x) {
+#if USE_SLEEP_RATHER_THAN_ABORT
malloc_printf("*** error %d\n", x);
-#if USE_SLEEP_RATHER_THAN_ABORT
sleep(3600);
#else
+ _SIMPLE_STRING b = _simple_salloc();
+ if (b) {
+ _simple_sprintf(b, "*** error %d", x);
+ malloc_printf("%s\n", _simple_string(b));
+ CRSetCrashLogMessage(_simple_string(b));
+ } else {
+ _malloc_printf(MALLOC_PRINTF_NOLOG, "*** error %d", x);
+ CRSetCrashLogMessage("*** DefaultMallocError called");
+ }
abort();
#endif
}
@@ -908,6 +1368,12 @@
malloc_error(void (*func)(int)))(int) {
return DefaultMallocError;
}
+
+/* Stack logging fork-handling prototypes */
+extern void __stack_logging_fork_prepare();
+extern void __stack_logging_fork_parent();
+extern void __stack_logging_fork_child();
+extern void __stack_logging_early_finished();
void
_malloc_fork_prepare() {
@@ -918,12 +1384,14 @@
malloc_zone_t *zone = malloc_zones[index++];
zone->introspect->force_lock(zone);
}
+ __stack_logging_fork_prepare();
}
void
_malloc_fork_parent() {
/* Called in the parent process after a fork() to resume normal operation. */
unsigned index = 0;
+ __stack_logging_fork_parent();
MALLOC_UNLOCK();
while (index < malloc_num_zones) {
malloc_zone_t *zone = malloc_zones[index++];
@@ -935,6 +1403,7 @@
_malloc_fork_child() {
/* Called in the child process after a fork() to resume normal operation. In the MTASK case we also have to change memory inheritance so that the child does not share memory with the parent. */
unsigned index = 0;
+ __stack_logging_fork_child();
MALLOC_UNLOCK();
while (index < malloc_num_zones) {
malloc_zone_t *zone = malloc_zones[index++];
@@ -965,6 +1434,62 @@
return(m);
}
+boolean_t
+malloc_zone_enable_discharge_checking(malloc_zone_t *zone)
+{
+ if (zone->version < 7) // Version must be >= 7 to look at the new discharge checking fields.
+ 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) // Version must be >= 7 to look at the new discharge checking fields.
+ 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) // Version must be >= 7 to look at the new discharge checking fields.
+ 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);
+ }
+}
+
/***************** OBSOLETE ENTRY POINTS ********************/
#if PHASE_OUT_OLD_MALLOC