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--- libmalloc/libmalloc-116.30.3/src/nano_malloc.c
+++ libmalloc/libmalloc-140.40.1/src/nano_malloc.c
@@ -125,7 +125,7 @@
if (add_guard_pages) {
addr += vm_page_size;
- protect((void *)addr, size, PROT_NONE, debug_flags);
+ mvm_protect((void *)addr, size, PROT_NONE, debug_flags);
}
return (void *)addr;
}
@@ -153,6 +153,44 @@
nanozone_error(nanozone, 0, "Can't deallocate_pages at", addr, NULL);
}
}
+
+#if NANO_PREALLOCATE_BAND_VM
+static boolean_t
+nano_preallocate_band_vm(void)
+{
+ nano_blk_addr_t u;
+ uintptr_t s, e;
+
+ u.fields.nano_signature = NANOZONE_SIGNATURE;
+ u.fields.nano_mag_index = 0;
+ u.fields.nano_band = 0;
+ u.fields.nano_slot = 0;
+ u.fields.nano_offset = 0;
+
+ s = u.addr; // start of first possible band
+
+ u.fields.nano_mag_index = (1 << NANO_MAG_BITS) - 1;
+ u.fields.nano_band = (1 << NANO_BAND_BITS) - 1;
+
+ e = u.addr + BAND_SIZE; // end of last possible band
+
+ mach_vm_address_t vm_addr = s;
+ mach_vm_size_t vm_size = (e - s);
+
+ kern_return_t kr = mach_vm_map(mach_task_self(), &vm_addr, vm_size, 0,
+ VM_MAKE_TAG(VM_MEMORY_MALLOC_NANO), MEMORY_OBJECT_NULL, 0, FALSE,
+ VM_PROT_DEFAULT, VM_PROT_ALL, VM_INHERIT_DEFAULT);
+
+ void *q = (void *)vm_addr;
+ if (kr || q != (void*)s) { // Must get exactly what we asked for
+ if (!kr) {
+ mach_vm_deallocate(mach_task_self(), vm_addr, vm_size);
+ }
+ return FALSE;
+ }
+ return TRUE;
+}
+#endif
/*
* We maintain separate free lists for each (quantized) size. The literature
@@ -190,8 +228,8 @@
pMeta->slot_current_base_addr = p;
mach_vm_address_t vm_addr = p & ~((uintptr_t)(BAND_SIZE - 1)); // Address of the (2MB) band covering this (128KB) slot
-
if (nanozone->band_max_mapped_baseaddr[mag_index] < vm_addr) {
+#if !NANO_PREALLOCATE_BAND_VM
// Obtain the next band to cover this slot
kern_return_t kr = mach_vm_map(mach_task_self(), &vm_addr, BAND_SIZE, 0, VM_MAKE_TAG(VM_MEMORY_MALLOC_NANO),
MEMORY_OBJECT_NULL, 0, FALSE, VM_PROT_DEFAULT, VM_PROT_ALL, VM_INHERIT_DEFAULT);
@@ -203,7 +241,7 @@
}
return FALSE;
}
-
+#endif
nanozone->band_max_mapped_baseaddr[mag_index] = vm_addr;
}
@@ -987,13 +1025,17 @@
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.
}
- p.addr = (uint64_t)ptr; // place ptr on the dissecting table
- if (nanozone->our_signature == p.fields.nano_signature) {
+
+ // <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) {
/* NOTHING. Drop it on the floor as nanozone metadata could be fouled by fork. */
return;
} else {
@@ -1035,49 +1077,42 @@
static void *
nano_realloc(nanozone_t *nanozone, void *ptr, size_t new_size)
{
- 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
+ // could occur through malloc_zone_realloc() path
+ if (!ptr) {
// If ptr is a null pointer, realloc() shall be equivalent to malloc() for the specified size.
return nano_malloc(nanozone, new_size);
- } else if (nanozone->our_signature == p.fields.nano_signature) { // Our signature?
- if (new_size <= NANO_MAX_SIZE) { // nano to nano?
+ }
+
+ 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?
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);
+ 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;
- } 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);
-
- return zone->realloc(zone, ptr, new_size);
+ }
+ /* NOTREACHED */
}
/* NOTREACHED */
}
@@ -1085,14 +1120,18 @@
static void *
nano_forked_realloc(nanozone_t *nanozone, void *ptr, size_t new_size)
{
- 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
+ // could occur through malloc_zone_realloc() path
+ if (!ptr) {
// If ptr is a null pointer, realloc() shall be equivalent to malloc() for the specified size.
return nano_forked_malloc(nanozone, new_size);
- } else if (nanozone->our_signature == p.fields.nano_signature) { // Our signature?
+ }
+
+ 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 (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.
@@ -1102,31 +1141,19 @@
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);
+ 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;
- } 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);
-
- return zone->realloc(zone, ptr, new_size);
+ }
+ /* NOTREACHED */
}
/* NOTREACHED */
}
@@ -1843,19 +1870,24 @@
nanozone_t *nanozone;
int i, j;
+ /* Note: It is important that create_nano_zone clears _malloc_engaged_nano
+ * if it is unable to enable the nanozone (and chooses not to abort). As
+ * several functions rely on _malloc_engaged_nano to determine if they
+ * should manipulate the nanozone, and these should not run if we failed
+ * to create the zone.
+ */
if (!_malloc_engaged_nano) {
return NULL;
}
-#if defined(__x86_64__)
if (_COMM_PAGE_VERSION_REQD > (*((uint16_t *)_COMM_PAGE_VERSION))) {
MALLOC_PRINTF_FATAL_ERROR((*((uint16_t *)_COMM_PAGE_VERSION)), "comm page version mismatch");
}
-#endif
/* get memory for the zone. */
nanozone = nano_allocate_pages(NULL, NANOZONE_PAGED_SIZE, 0, 0, VM_MEMORY_MALLOC);
if (!nanozone) {
+ _malloc_engaged_nano = false;
return NULL;
}
@@ -1887,20 +1919,18 @@
nanozone->our_signature = NANOZONE_SIGNATURE;
/* Query the number of configured processors. */
-#if defined(__x86_64__)
nanozone->phys_ncpus = *(uint8_t *)(uintptr_t)_COMM_PAGE_PHYSICAL_CPUS;
nanozone->logical_ncpus = *(uint8_t *)(uintptr_t)_COMM_PAGE_LOGICAL_CPUS;
-#else
-#error Unknown architecture
-#endif
-
- if (nanozone->phys_ncpus > sizeof(nanozone->core_mapped_size) / sizeof(nanozone->core_mapped_size[0])) {
- _malloc_printf(ASL_LEVEL_NOTICE, "nano zone abandoned because NCPUS mismatch.\n");
- return NULL;
+
+ if (nanozone->phys_ncpus > sizeof(nanozone->core_mapped_size) /
+ sizeof(nanozone->core_mapped_size[0])) {
+ MALLOC_PRINTF_FATAL_ERROR(nanozone->phys_ncpus,
+ "nanozone abandoned because NCPUS > max magazines.\n");
}
if (0 != (nanozone->logical_ncpus % nanozone->phys_ncpus)) {
- MALLOC_PRINTF_FATAL_ERROR(nanozone->logical_ncpus % nanozone->phys_ncpus, "logical_ncpus % phys_ncpus != 0");
+ MALLOC_PRINTF_FATAL_ERROR(nanozone->logical_ncpus % nanozone->phys_ncpus,
+ "logical_ncpus % phys_ncpus != 0");
}
switch (nanozone->logical_ncpus / nanozone->phys_ncpus) {
@@ -1946,6 +1976,40 @@
return (malloc_zone_t *)nanozone;
}
+boolean_t _malloc_engaged_nano;
+
+void
+nano_init(const char *envp[], const char *apple[])
+{
+ const char *flag = _simple_getenv(apple, "MallocNanoZone");
+ if (flag && flag[0] == '1') {
+ _malloc_engaged_nano = 1;
+ }
+#if CONFIG_NANO_SMALLMEM_DYNAMIC_DISABLE_35305995
+ // Disable nano malloc on <=1gb configurations rdar://problem/35305995
+ uint64_t memsize = platform_hw_memsize();
+ if (memsize <= (1ull << 30)) {
+ _malloc_engaged_nano = 0;
+ }
+#endif // CONFIG_NANO_SMALLMEM_DYNAMIC_DISABLE_35305995
+ /* Explicit overrides from the environment */
+ flag = _simple_getenv(envp, "MallocNanoZone");
+ if (flag && flag[0] == '1') {
+ _malloc_engaged_nano = 1;
+ } else if (flag && flag[0] == '0') {
+ _malloc_engaged_nano = 0;
+ }
+#if NANO_PREALLOCATE_BAND_VM
+ // Unconditionally preallocate the VA space set aside for nano malloc to
+ // reserve it in all configurations. rdar://problem/33392283
+ boolean_t preallocated = nano_preallocate_band_vm();
+ if (!preallocated && _malloc_engaged_nano) {
+ _malloc_printf(ASL_LEVEL_NOTICE, "nano zone abandoned due to inability to preallocate reserved vm space.\n");
+ _malloc_engaged_nano = 0;
+ }
+#endif
+}
+
#endif // CONFIG_NANOZONE
/* vim: set noet:ts=4:sw=4:cindent: */