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--- libmalloc/libmalloc-116.50.8/src/nano_malloc.c
+++ libmalloc/libmalloc-116/src/nano_malloc.c
@@ -566,10 +566,6 @@
p.addr = (uint64_t)ptr; // Begin the dissection of ptr
- if (nanozone->our_signature != p.fields.nano_signature) {
- return 0;
- }
-
if (nanozone->phys_ncpus <= p.fields.nano_mag_index) {
return 0;
}
@@ -956,19 +952,14 @@
__nano_free(nanozone_t *nanozone, void *ptr, boolean_t do_scribble)
{
MALLOC_TRACE(TRACE_nano_free, (uintptr_t)nanozone, (uintptr_t)ptr, do_scribble, 0);
+ nano_blk_addr_t p; // happily, the compiler holds this in a register
if (!ptr) {
return; // Protect against malloc_zone_free() passing NULL.
}
-
- // <rdar://problem/26481467> exhausting a slot may result in a pointer with
- // the nanozone prefix being given to nano_free via malloc_zone_free. Calling
- // vet_and_size here, instead of in _nano_free_check_scribble means we can
- // early-out into the helper_zone if it turns out nano does not own this ptr.
- size_t sz = _nano_vet_and_size_of_live(nanozone, ptr);
-
- if (sz) {
- _nano_free_trusted_size_check_scribble(nanozone, ptr, sz, do_scribble);
+ p.addr = (uint64_t)ptr; // place ptr on the dissecting table
+ if (nanozone->our_signature == p.fields.nano_signature) {
+ _nano_free_check_scribble(nanozone, ptr, do_scribble);
return;
} else {
malloc_zone_t *zone = (malloc_zone_t *)(nanozone->helper_zone);
@@ -987,17 +978,13 @@
static void
nano_forked_free(nanozone_t *nanozone, void *ptr)
{
+ nano_blk_addr_t p; // happily, the compiler holds this in a register
+
if (!ptr) {
return; // Protect against malloc_zone_free() passing NULL.
}
-
- // <rdar://problem/26481467> exhausting a slot may result in a pointer with
- // the nanozone prefix being given to nano_free via malloc_zone_free. Calling
- // vet_and_size here, instead of in _nano_free_check_scribble means we can
- // early-out into the helper_zone if it turns out nano does not own this ptr.
- size_t sz = _nano_vet_and_size_of_live(nanozone, ptr);
-
- if (sz) {
+ p.addr = (uint64_t)ptr; // place ptr on the dissecting table
+ if (nanozone->our_signature == p.fields.nano_signature) {
/* NOTHING. Drop it on the floor as nanozone metadata could be fouled by fork. */
return;
} else {
@@ -1039,42 +1026,49 @@
static void *
nano_realloc(nanozone_t *nanozone, void *ptr, size_t new_size)
{
- // could occur through malloc_zone_realloc() path
- if (!ptr) {
+ nano_blk_addr_t p; // happily, the compiler holds this in a register
+
+ p.addr = (uint64_t)ptr; // place ptr on the dissecting table
+
+ if (NULL == ptr) { // could occur through malloc_zone_realloc() path
// If ptr is a null pointer, realloc() shall be equivalent to malloc() for the specified size.
return nano_malloc(nanozone, new_size);
- }
-
- size_t old_size = _nano_vet_and_size_of_live(nanozone, ptr);
- if (!old_size) {
- // not-nano pointer, hand down to helper zone
- malloc_zone_t *zone = (malloc_zone_t *)(nanozone->helper_zone);
- return zone->realloc(zone, ptr, new_size);
- } else {
- if (new_size <= NANO_MAX_SIZE) {
- // nano to nano?
+ } else if (nanozone->our_signature == p.fields.nano_signature) { // Our signature?
+ if (new_size <= NANO_MAX_SIZE) { // nano to nano?
void *q = _nano_realloc(nanozone, ptr, new_size);
if (q) {
return q;
- } else {
- // nano exhausted
- /* FALLTHROUGH to helper zone copying case */
- }
- }
-
+ } else { // nano exhausted
+ /* FALLTHROUGH to helper zone copying case */
+ }
+ }
+
+ // nano to larger-than-nano (or FALLTHROUGH from just above)
+ size_t old_size = _nano_vet_and_size_of_live(nanozone, ptr);
+
+ if (!old_size) {
+ nanozone_error(nanozone, 1, "pointer being reallocated was not allocated", ptr, NULL);
+ return NULL;
+ } else {
+ malloc_zone_t *zone = (malloc_zone_t *)(nanozone->helper_zone);
+ void *new_ptr = zone->malloc(zone, new_size);
+
+ if (new_ptr) {
+ size_t valid_size = MIN(old_size, new_size);
+ memcpy(new_ptr, ptr, valid_size);
+ _nano_free_check_scribble(nanozone, ptr, (nanozone->debug_flags & MALLOC_DO_SCRIBBLE));
+ return new_ptr;
+ } else {
+ /* Original ptr is left intact */
+ return NULL;
+ }
+ /* NOTREACHED */
+ }
+ } else {
+ // other-than-nano (not necessarily larger! possibly NULL!) to whatever
malloc_zone_t *zone = (malloc_zone_t *)(nanozone->helper_zone);
- void *new_ptr = zone->malloc(zone, new_size);
-
- if (new_ptr) {
- size_t valid_size = MIN(old_size, new_size);
- memcpy(new_ptr, ptr, valid_size);
- _nano_free_check_scribble(nanozone, ptr, (nanozone->debug_flags & MALLOC_DO_SCRIBBLE));
- return new_ptr;
- } else {
- /* Original ptr is left intact */
- return NULL;
- }
- /* NOTREACHED */
+
+ return zone->realloc(zone, ptr, new_size);
}
/* NOTREACHED */
}
@@ -1082,18 +1076,14 @@
static void *
nano_forked_realloc(nanozone_t *nanozone, void *ptr, size_t new_size)
{
- // could occur through malloc_zone_realloc() path
- if (!ptr) {
+ nano_blk_addr_t p; // happily, the compiler holds this in a register
+
+ p.addr = (uint64_t)ptr; // place ptr on the dissecting table
+
+ if (NULL == ptr) { // could occur through malloc_zone_realloc() path
// If ptr is a null pointer, realloc() shall be equivalent to malloc() for the specified size.
return nano_forked_malloc(nanozone, new_size);
- }
-
- size_t old_size = _nano_vet_and_size_of_live(nanozone, ptr);
- if (!old_size) {
- // not-nano pointer, hand down to helper zone
- malloc_zone_t *zone = (malloc_zone_t *)(nanozone->helper_zone);
- return zone->realloc(zone, ptr, new_size);
- } else {
+ } else if (nanozone->our_signature == p.fields.nano_signature) { // Our signature?
if (0 == new_size) {
// If size is 0 and ptr is not a null pointer, the object pointed to is freed.
// However as nanozone metadata could be fouled by fork, we'll intentionally leak it.
@@ -1103,19 +1093,31 @@
return nano_forked_malloc(nanozone, 1);
}
+ size_t old_size = _nano_vet_and_size_of_live(nanozone, ptr);
+
+ if (!old_size) {
+ nanozone_error(nanozone, 1, "pointer being reallocated was not allocated", ptr, NULL);
+ return NULL;
+ } else {
+ malloc_zone_t *zone = (malloc_zone_t *)(nanozone->helper_zone);
+ void *new_ptr = zone->malloc(zone, new_size);
+
+ if (new_ptr) {
+ size_t valid_size = MIN(old_size, new_size);
+ memcpy(new_ptr, ptr, valid_size);
+ /* Original pointer is intentionally leaked as nanozone metadata could be fouled by fork. */
+ return new_ptr;
+ } else {
+ /* Original ptr is left intact */
+ return NULL;
+ }
+ /* NOTREACHED */
+ }
+ } else {
+ // other-than-nano (not necessarily larger! possibly NULL!) to whatever
malloc_zone_t *zone = (malloc_zone_t *)(nanozone->helper_zone);
- void *new_ptr = zone->malloc(zone, new_size);
-
- if (new_ptr) {
- size_t valid_size = MIN(old_size, new_size);
- memcpy(new_ptr, ptr, valid_size);
- /* Original pointer is intentionally leaked as nanozone metadata could be fouled by fork. */
- return new_ptr;
- } else {
- /* Original ptr is left intact */
- return NULL;
- }
- /* NOTREACHED */
+
+ return zone->realloc(zone, ptr, new_size);
}
/* NOTREACHED */
}