#include <zone_debug.h>
#include <mach/mach_types.h>
#include <mach/vm_param.h>
#include <mach/kern_return.h>
#include <mach/mach_host_server.h>
#include <mach/task_server.h>
#include <mach/machine/vm_types.h>
#include <mach/vm_map.h>
#include <mach/sdt.h>
#include <kern/bits.h>
#include <kern/kern_types.h>
#include <kern/assert.h>
#include <kern/backtrace.h>
#include <kern/host.h>
#include <kern/macro_help.h>
#include <kern/sched.h>
#include <kern/locks.h>
#include <kern/sched_prim.h>
#include <kern/misc_protos.h>
#include <kern/thread_call.h>
#include <kern/zalloc.h>
#include <kern/kalloc.h>
#include <prng/random.h>
#include <vm/pmap.h>
#include <vm/vm_map.h>
#include <vm/vm_kern.h>
#include <vm/vm_page.h>
#include <pexpert/pexpert.h>
#include <machine/machparam.h>
#include <machine/machine_routines.h>
#include <libkern/OSDebug.h>
#include <libkern/OSAtomic.h>
#include <libkern/section_keywords.h>
#include <sys/kdebug.h>
#include <san/kasan.h>
lck_grp_t zone_locks_grp;
lck_grp_attr_t zone_locks_grp_attr;
#define from_zone_map(addr, size) \
((vm_offset_t)(addr) >= zone_map_min_address && \
((vm_offset_t)(addr) + size - 1) < zone_map_max_address )
static inline boolean_t
sample_counter(volatile uint32_t * count_p, uint32_t factor)
{
uint32_t old_count, new_count;
boolean_t rolled_over;
do {
new_count = old_count = *count_p;
if (++new_count >= factor) {
rolled_over = TRUE;
new_count = 0;
} else {
rolled_over = FALSE;
}
} while (!OSCompareAndSwap(old_count, new_count, count_p));
return rolled_over;
}
#if defined(__LP64__)
#define ZP_POISON 0xdeadbeefdeadbeef
#else
#define ZP_POISON 0xdeadbeef
#endif
boolean_t zfree_poison_element(zone_t zone, vm_offset_t elem);
void zalloc_poison_element(boolean_t check_poison, zone_t zone, vm_offset_t addr);
#define ZP_DEFAULT_SAMPLING_FACTOR 16
#define ZP_DEFAULT_SCALE_FACTOR 4
#if DEBUG
#define DEFAULT_ZP_FACTOR (1)
#else
#define DEFAULT_ZP_FACTOR (0)
#endif
uint32_t zp_factor = DEFAULT_ZP_FACTOR;
uint32_t zp_scale = 0;
vm_size_t zp_tiny_zone_limit = 0;
uintptr_t zp_poisoned_cookie = 0;
uintptr_t zp_nopoison_cookie = 0;
#if VM_MAX_TAG_ZONES
boolean_t zone_tagging_on;
#endif
SECURITY_READ_ONLY_LATE(boolean_t) copyio_zalloc_check = TRUE;
static struct bool_gen zone_bool_gen;
static inline void
zp_init(void)
{
char temp_buf[16];
zp_poisoned_cookie = (uintptr_t) early_random();
ml_cpu_info_t cpu_info;
ml_cpu_get_info(&cpu_info);
zp_tiny_zone_limit = (vm_size_t) cpu_info.cache_line_size;
zp_factor = ZP_DEFAULT_SAMPLING_FACTOR;
zp_scale = ZP_DEFAULT_SCALE_FACTOR;
if (zp_factor != 0) {
uint32_t rand_bits = early_random() & 0x3;
if (rand_bits == 0x1) {
zp_factor += 1;
} else if (rand_bits == 0x2) {
zp_factor -= 1;
}
}
if (PE_parse_boot_argn("-zp", temp_buf, sizeof(temp_buf))) {
zp_factor = 1;
}
if (PE_parse_boot_argn("-no-zp", temp_buf, sizeof(temp_buf))) {
zp_factor = 0;
zp_tiny_zone_limit = 0;
printf("Zone poisoning disabled\n");
}
if (PE_parse_boot_argn("zp-factor", &zp_factor, sizeof(zp_factor))) {
printf("Zone poisoning factor override: %u\n", zp_factor);
}
if (PE_parse_boot_argn("zp-scale", &zp_scale, sizeof(zp_scale))) {
printf("Zone poisoning scale factor override: %u\n", zp_scale);
}
zp_nopoison_cookie = (uintptr_t) early_random();
#if MACH_ASSERT
if (zp_poisoned_cookie == zp_nopoison_cookie) {
panic("early_random() is broken: %p and %p are not random\n",
(void *) zp_poisoned_cookie, (void *) zp_nopoison_cookie);
}
#endif
zp_poisoned_cookie |= (uintptr_t)0x1ULL;
zp_nopoison_cookie &= ~((uintptr_t)0x1ULL);
#if defined(__LP64__)
zp_poisoned_cookie &= 0x000000FFFFFFFFFF;
zp_poisoned_cookie |= 0x0535210000000000;
zp_nopoison_cookie &= 0x000000FFFFFFFFFF;
zp_nopoison_cookie |= 0x3f00110000000000;
#endif
}
#define ZONE_PAGE_COUNT_INCR(z, count) \
{ \
OSAddAtomic64(count, &(z->page_count)); \
}
#define ZONE_PAGE_COUNT_DECR(z, count) \
{ \
OSAddAtomic64(-count, &(z->page_count)); \
}
vm_map_t zone_map = VM_MAP_NULL;
vm_offset_t zone_map_min_address = 0;
vm_offset_t zone_map_max_address = 0;
#define MAX_ENTROPY_PER_ZCRAM 4
vm_offset_t zone_metadata_region_min = 0;
vm_offset_t zone_metadata_region_max = 0;
decl_lck_mtx_data(static, zone_metadata_region_lck);
lck_attr_t zone_metadata_lock_attr;
lck_mtx_ext_t zone_metadata_region_lck_ext;
struct zone_free_element {
struct zone_free_element *next;
};
#if CONFIG_ZCACHE
bool cache_all_zones = FALSE;
static char cache_zone_name[MAX_ZONE_NAME];
static inline bool
zone_caching_enabled(zone_t z)
{
return z->cpu_cache_enabled && !z->tags && !z->zleak_on;
}
#endif
decl_simple_lock_data(, all_zones_lock);
unsigned int num_zones_in_use;
unsigned int num_zones;
#if KASAN
#define MAX_ZONES 512
#else
#define MAX_ZONES 320
#endif/* !KASAN */
struct zone zone_array[MAX_ZONES];
bitmap_t zone_empty_bitmap[BITMAP_LEN(MAX_ZONES)];
#if DEBUG || DEVELOPMENT
decl_simple_lock_data(, zone_test_lock);
static boolean_t zone_test_running = FALSE;
static zone_t test_zone_ptr = NULL;
#endif
#define PAGE_METADATA_GET_ZINDEX(page_meta) \
(page_meta->zindex)
#define PAGE_METADATA_GET_ZONE(page_meta) \
(&(zone_array[page_meta->zindex]))
#define PAGE_METADATA_SET_ZINDEX(page_meta, index) \
page_meta->zindex = (index);
struct zone_page_metadata {
queue_chain_t pages;
union {
uint32_t freelist_offset;
uint32_t real_metadata_offset;
};
uint16_t free_count;
unsigned zindex : ZINDEX_BITS;
unsigned page_count : PAGECOUNT_BITS;
};
#define PAGE_INDEX_FOR_ELEMENT(element) \
(((vm_offset_t)trunc_page(element) - zone_map_min_address) / PAGE_SIZE)
#define PAGE_METADATA_FOR_PAGE_INDEX(index) \
(zone_metadata_region_min + ((index) * sizeof(struct zone_page_metadata)))
#define PAGE_INDEX_FOR_METADATA(page_meta) \
(((vm_offset_t)page_meta - zone_metadata_region_min) / sizeof(struct zone_page_metadata))
#define PAGE_FOR_PAGE_INDEX(index) \
(zone_map_min_address + (PAGE_SIZE * (index)))
#define PAGE_METADATA_FOR_ELEMENT(element) \
(struct zone_page_metadata *)(PAGE_METADATA_FOR_PAGE_INDEX(PAGE_INDEX_FOR_ELEMENT(element)))
#define PAGE_METADATA_EMPTY_FREELIST ((uint32_t)(~0))
vm_map_copy_t create_vm_map_copy(vm_offset_t start_addr, vm_size_t total_size, vm_size_t used_size);
boolean_t get_zone_info(zone_t z, mach_zone_name_t *zn, mach_zone_info_t *zi);
boolean_t is_zone_map_nearing_exhaustion(void);
extern void vm_pageout_garbage_collect(int collect);
static inline void *
page_metadata_get_freelist(struct zone_page_metadata *page_meta)
{
assert(PAGE_METADATA_GET_ZINDEX(page_meta) != MULTIPAGE_METADATA_MAGIC);
if (page_meta->freelist_offset == PAGE_METADATA_EMPTY_FREELIST) {
return NULL;
} else {
if (from_zone_map(page_meta, sizeof(struct zone_page_metadata))) {
return (void *)(PAGE_FOR_PAGE_INDEX(PAGE_INDEX_FOR_METADATA(page_meta)) + page_meta->freelist_offset);
} else {
return (void *)((vm_offset_t)page_meta + page_meta->freelist_offset);
}
}
}
static inline void
page_metadata_set_freelist(struct zone_page_metadata *page_meta, void *addr)
{
assert(PAGE_METADATA_GET_ZINDEX(page_meta) != MULTIPAGE_METADATA_MAGIC);
if (addr == NULL) {
page_meta->freelist_offset = PAGE_METADATA_EMPTY_FREELIST;
} else {
if (from_zone_map(page_meta, sizeof(struct zone_page_metadata))) {
page_meta->freelist_offset = (uint32_t)((vm_offset_t)(addr) - PAGE_FOR_PAGE_INDEX(PAGE_INDEX_FOR_METADATA(page_meta)));
} else {
page_meta->freelist_offset = (uint32_t)((vm_offset_t)(addr) - (vm_offset_t)page_meta);
}
}
}
static inline struct zone_page_metadata *
page_metadata_get_realmeta(struct zone_page_metadata *page_meta)
{
assert(PAGE_METADATA_GET_ZINDEX(page_meta) == MULTIPAGE_METADATA_MAGIC);
return (struct zone_page_metadata *)((vm_offset_t)page_meta - page_meta->real_metadata_offset);
}
static inline void
page_metadata_set_realmeta(struct zone_page_metadata *page_meta, struct zone_page_metadata *real_meta)
{
assert(PAGE_METADATA_GET_ZINDEX(page_meta) == MULTIPAGE_METADATA_MAGIC);
assert(PAGE_METADATA_GET_ZINDEX(real_meta) != MULTIPAGE_METADATA_MAGIC);
assert((vm_offset_t)page_meta > (vm_offset_t)real_meta);
vm_offset_t offset = (vm_offset_t)page_meta - (vm_offset_t)real_meta;
assert(offset <= UINT32_MAX);
page_meta->real_metadata_offset = (uint32_t)offset;
}
static inline vm_offset_t *
get_backup_ptr(vm_size_t elem_size,
vm_offset_t *element)
{
return (vm_offset_t *) ((vm_offset_t)element + elem_size - sizeof(vm_offset_t));
}
static inline void
zone_populate_metadata_page(struct zone_page_metadata *page_meta)
{
vm_offset_t page_metadata_begin = trunc_page(page_meta);
vm_offset_t page_metadata_end = trunc_page((vm_offset_t)page_meta + sizeof(struct zone_page_metadata));
for (; page_metadata_begin <= page_metadata_end; page_metadata_begin += PAGE_SIZE) {
#if !KASAN
if (pmap_find_phys(kernel_pmap, (vm_map_address_t)page_metadata_begin)) {
continue;
}
#endif
lck_mtx_lock(&zone_metadata_region_lck);
if (0 == pmap_find_phys(kernel_pmap, (vm_map_address_t)page_metadata_begin)) {
kern_return_t __assert_only ret = kernel_memory_populate(zone_map,
page_metadata_begin,
PAGE_SIZE,
KMA_KOBJECT,
VM_KERN_MEMORY_OSFMK);
assert(ret == KERN_SUCCESS);
}
lck_mtx_unlock(&zone_metadata_region_lck);
}
return;
}
static inline uint16_t
get_metadata_alloc_count(struct zone_page_metadata *page_meta)
{
assert(PAGE_METADATA_GET_ZINDEX(page_meta) != MULTIPAGE_METADATA_MAGIC);
struct zone *z = PAGE_METADATA_GET_ZONE(page_meta);
return (page_meta->page_count * PAGE_SIZE) / z->elem_size;
}
static inline struct zone_page_metadata *
get_zone_page_metadata(struct zone_free_element *element, boolean_t init)
{
struct zone_page_metadata *page_meta = 0;
if (from_zone_map(element, sizeof(struct zone_free_element))) {
page_meta = (struct zone_page_metadata *)(PAGE_METADATA_FOR_ELEMENT(element));
if (init) {
zone_populate_metadata_page(page_meta);
}
} else {
page_meta = (struct zone_page_metadata *)(trunc_page((vm_offset_t)element));
}
if (init) {
bzero((char *)page_meta, sizeof(struct zone_page_metadata));
}
return (PAGE_METADATA_GET_ZINDEX(page_meta) != MULTIPAGE_METADATA_MAGIC) ? page_meta : page_metadata_get_realmeta(page_meta);
}
static inline vm_offset_t
get_zone_page(struct zone_page_metadata *page_meta)
{
if (from_zone_map(page_meta, sizeof(struct zone_page_metadata))) {
return (vm_offset_t)(PAGE_FOR_PAGE_INDEX(PAGE_INDEX_FOR_METADATA(page_meta)));
} else {
return (vm_offset_t)(trunc_page(page_meta));
}
}
void
zone_require(void *addr, zone_t expected_zone)
{
struct zone *src_zone = NULL;
struct zone_page_metadata *page_meta = get_zone_page_metadata((struct zone_free_element *)addr, FALSE);
src_zone = PAGE_METADATA_GET_ZONE(page_meta);
if (__improbable(src_zone == NULL)) {
panic("Address not in a zone for zone_require check (addr: %p)", addr);
}
if (__improbable(src_zone != expected_zone)) {
panic("Address not in expected zone for zone_require check (addr: %p, zone: %s)", addr, src_zone->zone_name);
}
}
#if VM_MAX_TAG_ZONES
#define ZTAGBASE(zone, element) \
(&((uint32_t *)zone_tagbase_min)[atop((element) - zone_map_min_address)])
#define ZTAG(zone, element) \
({ \
vm_tag_t * result; \
if ((zone)->tags_inline) { \
result = (vm_tag_t *) ZTAGBASE((zone), (element)); \
if ((page_mask & element) >= (zone)->elem_size) result++; \
} else { \
result = &((vm_tag_t *)zone_tags_min)[ZTAGBASE((zone), (element))[0] + ((element) & page_mask) / (zone)->elem_size]; \
} \
result; \
})
static vm_offset_t zone_tagbase_min;
static vm_offset_t zone_tagbase_max;
static vm_offset_t zone_tagbase_map_size;
static vm_map_t zone_tagbase_map;
static vm_offset_t zone_tags_min;
static vm_offset_t zone_tags_max;
static vm_offset_t zone_tags_map_size;
static vm_map_t zone_tags_map;
decl_lck_mtx_data(, ztLock);
enum{
ztFreeIndexCount = 8,
ztFreeIndexMax = (ztFreeIndexCount - 1),
ztTagsPerBlock = 4
};
struct ztBlock {
#if __LITTLE_ENDIAN__
uint64_t free:1,
next:21,
prev:21,
size:21;
#else
#error !__LITTLE_ENDIAN__
#endif
};
typedef struct ztBlock ztBlock;
static ztBlock * ztBlocks;
static uint32_t ztBlocksCount;
static uint32_t ztBlocksFree;
static uint32_t
ztLog2up(uint32_t size)
{
if (1 == size) {
size = 0;
} else {
size = 32 - __builtin_clz(size - 1);
}
return size;
}
static uint32_t
ztLog2down(uint32_t size)
{
size = 31 - __builtin_clz(size);
return size;
}
static void
ztFault(vm_map_t map, const void * address, size_t size, uint32_t flags)
{
vm_map_offset_t addr = (vm_map_offset_t) address;
vm_map_offset_t page, end;
page = trunc_page(addr);
end = round_page(addr + size);
for (; page < end; page += page_size) {
if (!pmap_find_phys(kernel_pmap, page)) {
kern_return_t __unused
ret = kernel_memory_populate(map, page, PAGE_SIZE,
KMA_KOBJECT | flags, VM_KERN_MEMORY_DIAG);
assert(ret == KERN_SUCCESS);
}
}
}
static boolean_t
ztPresent(const void * address, size_t size)
{
vm_map_offset_t addr = (vm_map_offset_t) address;
vm_map_offset_t page, end;
boolean_t result;
page = trunc_page(addr);
end = round_page(addr + size);
for (result = TRUE; (page < end); page += page_size) {
result = pmap_find_phys(kernel_pmap, page);
if (!result) {
break;
}
}
return result;
}
void __unused
ztDump(boolean_t sanity);
void __unused
ztDump(boolean_t sanity)
{
uint32_t q, cq, p;
for (q = 0; q <= ztFreeIndexMax; q++) {
p = q;
do{
if (sanity) {
cq = ztLog2down(ztBlocks[p].size);
if (cq > ztFreeIndexMax) {
cq = ztFreeIndexMax;
}
if (!ztBlocks[p].free
|| ((p != q) && (q != cq))
|| (ztBlocks[ztBlocks[p].next].prev != p)
|| (ztBlocks[ztBlocks[p].prev].next != p)) {
kprintf("zterror at %d", p);
ztDump(FALSE);
kprintf("zterror at %d", p);
assert(FALSE);
}
continue;
}
kprintf("zt[%03d]%c %d, %d, %d\n",
p, ztBlocks[p].free ? 'F' : 'A',
ztBlocks[p].next, ztBlocks[p].prev,
ztBlocks[p].size);
p = ztBlocks[p].next;
if (p == q) {
break;
}
}while (p != q);
if (!sanity) {
printf("\n");
}
}
if (!sanity) {
printf("-----------------------\n");
}
}
#define ZTBDEQ(idx) \
ztBlocks[ztBlocks[(idx)].prev].next = ztBlocks[(idx)].next; \
ztBlocks[ztBlocks[(idx)].next].prev = ztBlocks[(idx)].prev;
static void
ztFree(zone_t zone __unused, uint32_t index, uint32_t count)
{
uint32_t q, w, p, size, merge;
assert(count);
ztBlocksFree += count;
merge = (index + count);
if ((merge < ztBlocksCount)
&& ztPresent(&ztBlocks[merge], sizeof(ztBlocks[merge]))
&& ztBlocks[merge].free) {
ZTBDEQ(merge);
count += ztBlocks[merge].size;
}
merge = (index - 1);
if ((merge > ztFreeIndexMax)
&& ztPresent(&ztBlocks[merge], sizeof(ztBlocks[merge]))
&& ztBlocks[merge].free) {
size = ztBlocks[merge].size;
count += size;
index -= size;
ZTBDEQ(index);
}
q = ztLog2down(count);
if (q > ztFreeIndexMax) {
q = ztFreeIndexMax;
}
w = q;
while (TRUE) {
p = ztBlocks[w].next;
if (p == q) {
break;
}
if (ztBlocks[p].size >= count) {
break;
}
w = p;
}
ztBlocks[p].prev = index;
ztBlocks[w].next = index;
ztFault(zone_tags_map, &ztBlocks[index], sizeof(ztBlocks[index]), 0);
ztBlocks[index].free = TRUE;
ztBlocks[index].size = count;
ztBlocks[index].prev = w;
ztBlocks[index].next = p;
if (count > 1) {
index += (count - 1);
ztFault(zone_tags_map, &ztBlocks[index], sizeof(ztBlocks[index]), 0);
ztBlocks[index].free = TRUE;
ztBlocks[index].size = count;
}
}
static uint32_t
ztAlloc(zone_t zone, uint32_t count)
{
uint32_t q, w, p, leftover;
assert(count);
q = ztLog2up(count);
if (q > ztFreeIndexMax) {
q = ztFreeIndexMax;
}
do{
w = q;
while (TRUE) {
p = ztBlocks[w].next;
if (p == q) {
break;
}
if (ztBlocks[p].size >= count) {
ztBlocks[w].next = ztBlocks[p].next;
ztBlocks[ztBlocks[p].next].prev = w;
ztBlocks[p].free = FALSE;
ztBlocksFree -= ztBlocks[p].size;
if (ztBlocks[p].size > 1) {
ztBlocks[p + ztBlocks[p].size - 1].free = FALSE;
}
ztFault(zone_tags_map, &ztBlocks[p], count * sizeof(ztBlocks[p]), 0);
if (count > 1) {
ztBlocks[p + count - 1].free = FALSE;
}
leftover = ztBlocks[p].size - count;
if (leftover) {
ztFree(zone, p + ztBlocks[p].size - leftover, leftover);
}
return p;
}
w = p;
}
q++;
}while (q <= ztFreeIndexMax);
return -1U;
}
static void
ztInit(vm_size_t max_zonemap_size, lck_grp_t * group)
{
kern_return_t ret;
vm_map_kernel_flags_t vmk_flags;
uint32_t idx;
lck_mtx_init(&ztLock, group, LCK_ATTR_NULL);
zone_tagbase_map_size = atop(max_zonemap_size) * sizeof(uint32_t);
vmk_flags = VM_MAP_KERNEL_FLAGS_NONE;
vmk_flags.vmkf_permanent = TRUE;
ret = kmem_suballoc(kernel_map, &zone_tagbase_min, zone_tagbase_map_size,
FALSE, VM_FLAGS_ANYWHERE, vmk_flags, VM_KERN_MEMORY_DIAG,
&zone_tagbase_map);
if (ret != KERN_SUCCESS) {
panic("zone_init: kmem_suballoc failed");
}
zone_tagbase_max = zone_tagbase_min + round_page(zone_tagbase_map_size);
zone_tags_map_size = 2048 * 1024 * sizeof(vm_tag_t);
vmk_flags = VM_MAP_KERNEL_FLAGS_NONE;
vmk_flags.vmkf_permanent = TRUE;
ret = kmem_suballoc(kernel_map, &zone_tags_min, zone_tags_map_size,
FALSE, VM_FLAGS_ANYWHERE, vmk_flags, VM_KERN_MEMORY_DIAG,
&zone_tags_map);
if (ret != KERN_SUCCESS) {
panic("zone_init: kmem_suballoc failed");
}
zone_tags_max = zone_tags_min + round_page(zone_tags_map_size);
ztBlocks = (ztBlock *) zone_tags_min;
ztBlocksCount = (uint32_t)(zone_tags_map_size / sizeof(ztBlock));
lck_mtx_lock(&ztLock);
ztFault(zone_tags_map, &ztBlocks[0], sizeof(ztBlocks[0]), 0);
for (idx = 0; idx < ztFreeIndexCount; idx++) {
ztBlocks[idx].free = TRUE;
ztBlocks[idx].next = idx;
ztBlocks[idx].prev = idx;
ztBlocks[idx].size = 0;
}
ztFree(NULL, ztFreeIndexCount, ztBlocksCount - ztFreeIndexCount);
lck_mtx_unlock(&ztLock);
}
static void
ztMemoryAdd(zone_t zone, vm_offset_t mem, vm_size_t size)
{
uint32_t * tagbase;
uint32_t count, block, blocks, idx;
size_t pages;
pages = atop(size);
tagbase = ZTAGBASE(zone, mem);
lck_mtx_lock(&ztLock);
ztFault(zone_tagbase_map, tagbase, pages * sizeof(uint32_t), 0);
if (!zone->tags_inline) {
count = (uint32_t)(size / zone->elem_size);
blocks = ((count + ztTagsPerBlock - 1) / ztTagsPerBlock);
block = ztAlloc(zone, blocks);
if (-1U == block) {
ztDump(false);
}
assert(-1U != block);
}
lck_mtx_unlock(&ztLock);
if (!zone->tags_inline) {
block *= ztTagsPerBlock;
for (idx = 0; idx < pages; idx++) {
tagbase[idx] = block + (uint32_t)((ptoa(idx) + (zone->elem_size - 1)) / zone->elem_size);
}
}
}
static void
ztMemoryRemove(zone_t zone, vm_offset_t mem, vm_size_t size)
{
uint32_t * tagbase;
uint32_t count, block, blocks, idx;
size_t pages;
pages = atop(size);
tagbase = ZTAGBASE(zone, mem);
block = tagbase[0];
for (idx = 0; idx < pages; idx++) {
tagbase[idx] = 0xFFFFFFFF;
}
lck_mtx_lock(&ztLock);
if (!zone->tags_inline) {
count = (uint32_t)(size / zone->elem_size);
blocks = ((count + ztTagsPerBlock - 1) / ztTagsPerBlock);
assert(block != 0xFFFFFFFF);
block /= ztTagsPerBlock;
ztFree(NULL , block, blocks);
}
lck_mtx_unlock(&ztLock);
}
uint32_t
zone_index_from_tag_index(uint32_t tag_zone_index, vm_size_t * elem_size)
{
zone_t z;
uint32_t idx;
simple_lock(&all_zones_lock, &zone_locks_grp);
for (idx = 0; idx < num_zones; idx++) {
z = &(zone_array[idx]);
if (!z->tags) {
continue;
}
if (tag_zone_index != z->tag_zone_index) {
continue;
}
*elem_size = z->elem_size;
break;
}
simple_unlock(&all_zones_lock);
if (idx == num_zones) {
idx = -1U;
}
return idx;
}
#endif
vm_size_t
zone_element_size(void *addr, zone_t *z)
{
struct zone *src_zone;
if (from_zone_map(addr, sizeof(void *))) {
struct zone_page_metadata *page_meta = get_zone_page_metadata((struct zone_free_element *)addr, FALSE);
src_zone = PAGE_METADATA_GET_ZONE(page_meta);
if (z) {
*z = src_zone;
}
return src_zone->elem_size;
} else {
#if CONFIG_GZALLOC
vm_size_t gzsize;
if (gzalloc_element_size(addr, z, &gzsize)) {
return gzsize;
}
#endif
return 0;
}
}
#if DEBUG || DEVELOPMENT
vm_size_t
zone_element_info(void *addr, vm_tag_t * ptag)
{
vm_size_t size = 0;
vm_tag_t tag = VM_KERN_MEMORY_NONE;
struct zone * src_zone;
if (from_zone_map(addr, sizeof(void *))) {
struct zone_page_metadata *page_meta = get_zone_page_metadata((struct zone_free_element *)addr, FALSE);
src_zone = PAGE_METADATA_GET_ZONE(page_meta);
#if VM_MAX_TAG_ZONES
if (__improbable(src_zone->tags)) {
tag = (ZTAG(src_zone, (vm_offset_t) addr)[0] >> 1);
}
#endif
size = src_zone->elem_size;
} else {
#if CONFIG_GZALLOC
gzalloc_element_size(addr, NULL, &size);
#endif
}
*ptag = tag;
return size;
}
#endif
static inline boolean_t
is_sane_zone_ptr(zone_t zone,
vm_offset_t addr,
size_t obj_size)
{
if (__improbable((addr & (sizeof(vm_offset_t) - 1)) != 0)) {
return FALSE;
}
if (__improbable(!pmap_kernel_va(addr))) {
return FALSE;
}
if (zone->collectable && !zone->allows_foreign) {
if (addr >= zone_map_min_address &&
(addr + obj_size - 1) < zone_map_max_address) {
return TRUE;
}
return FALSE;
}
return TRUE;
}
static inline boolean_t
is_sane_zone_page_metadata(zone_t zone,
vm_offset_t page_meta)
{
if (page_meta == 0) {
return FALSE;
}
return is_sane_zone_ptr(zone, page_meta, sizeof(struct zone_page_metadata));
}
static inline boolean_t
is_sane_zone_element(zone_t zone,
vm_offset_t addr)
{
if (addr == 0) {
return TRUE;
}
return is_sane_zone_ptr(zone, addr, zone->elem_size);
}
__dead2
static inline void
zone_element_was_modified_panic(zone_t zone,
vm_offset_t element,
vm_offset_t found,
vm_offset_t expected,
vm_offset_t offset)
{
panic("a freed zone element has been modified in zone %s: expected %p but found %p, bits changed %p, at offset %d of %d in element %p, cookies %p %p",
zone->zone_name,
(void *) expected,
(void *) found,
(void *) (expected ^ found),
(uint32_t) offset,
(uint32_t) zone->elem_size,
(void *) element,
(void *) zp_nopoison_cookie,
(void *) zp_poisoned_cookie);
}
__dead2
static void
backup_ptr_mismatch_panic(zone_t zone,
vm_offset_t element,
vm_offset_t primary,
vm_offset_t backup)
{
vm_offset_t likely_backup;
vm_offset_t likely_primary;
likely_primary = primary ^ zp_nopoison_cookie;
boolean_t sane_backup;
boolean_t sane_primary = is_sane_zone_element(zone, likely_primary);
boolean_t element_was_poisoned = (backup & 0x1) ? TRUE : FALSE;
#if defined(__LP64__)
if ((backup & 0xFFFFFF0000000000) == 0xFACADE0000000000) {
element_was_poisoned = TRUE;
} else if ((backup & 0xFFFFFF0000000000) == 0xC0FFEE0000000000) {
element_was_poisoned = FALSE;
}
#endif
if (element_was_poisoned) {
likely_backup = backup ^ zp_poisoned_cookie;
sane_backup = is_sane_zone_element(zone, likely_backup);
} else {
likely_backup = backup ^ zp_nopoison_cookie;
sane_backup = is_sane_zone_element(zone, likely_backup);
}
if (!sane_primary && sane_backup) {
zone_element_was_modified_panic(zone, element, primary, (likely_backup ^ zp_nopoison_cookie), 0);
}
if (sane_primary && !sane_backup) {
zone_element_was_modified_panic(zone, element, backup,
(likely_primary ^ (element_was_poisoned ? zp_poisoned_cookie : zp_nopoison_cookie)),
zone->elem_size - sizeof(vm_offset_t));
}
if (sane_primary && sane_backup) {
zone_element_was_modified_panic(zone, element, primary, (likely_backup ^ zp_nopoison_cookie), 0);
}
zone_element_was_modified_panic(zone, element, primary, (likely_backup ^ zp_nopoison_cookie), 0);
}
static inline void
free_to_zone(zone_t zone,
vm_offset_t element,
boolean_t poison)
{
vm_offset_t old_head;
struct zone_page_metadata *page_meta;
vm_offset_t *primary = (vm_offset_t *) element;
vm_offset_t *backup = get_backup_ptr(zone->elem_size, primary);
page_meta = get_zone_page_metadata((struct zone_free_element *)element, FALSE);
assert(PAGE_METADATA_GET_ZONE(page_meta) == zone);
old_head = (vm_offset_t)page_metadata_get_freelist(page_meta);
if (__improbable(!is_sane_zone_element(zone, old_head))) {
panic("zfree: invalid head pointer %p for freelist of zone %s\n",
(void *) old_head, zone->zone_name);
}
if (__improbable(!is_sane_zone_element(zone, element))) {
panic("zfree: freeing invalid pointer %p to zone %s\n",
(void *) element, zone->zone_name);
}
if (__improbable(old_head == element)) {
panic("zfree: double free of %p to zone %s\n",
(void *) element, zone->zone_name);
}
*backup = old_head ^ (poison ? zp_poisoned_cookie : zp_nopoison_cookie);
*primary = old_head ^ zp_nopoison_cookie;
page_metadata_set_freelist(page_meta, (struct zone_free_element *)element);
page_meta->free_count++;
if (zone->allows_foreign && !from_zone_map(element, zone->elem_size)) {
if (page_meta->free_count == 1) {
re_queue_tail(&zone->pages.any_free_foreign, &(page_meta->pages));
} else {
}
} else if (page_meta->free_count == get_metadata_alloc_count(page_meta)) {
re_queue_tail(&zone->pages.all_free, &(page_meta->pages));
zone->count_all_free_pages += page_meta->page_count;
} else if (page_meta->free_count == 1) {
re_queue_tail(&zone->pages.intermediate, &(page_meta->pages));
}
zone->count--;
zone->countfree++;
#if KASAN_ZALLOC
kasan_poison_range(element, zone->elem_size, ASAN_HEAP_FREED);
#endif
}
static inline vm_offset_t
try_alloc_from_zone(zone_t zone,
vm_tag_t tag __unused,
boolean_t* check_poison)
{
vm_offset_t element;
struct zone_page_metadata *page_meta;
*check_poison = FALSE;
if (zone->allows_foreign && !queue_empty(&zone->pages.any_free_foreign)) {
page_meta = (struct zone_page_metadata *)queue_first(&zone->pages.any_free_foreign);
} else if (!queue_empty(&zone->pages.intermediate)) {
page_meta = (struct zone_page_metadata *)queue_first(&zone->pages.intermediate);
} else if (!queue_empty(&zone->pages.all_free)) {
page_meta = (struct zone_page_metadata *)queue_first(&zone->pages.all_free);
assert(zone->count_all_free_pages >= page_meta->page_count);
zone->count_all_free_pages -= page_meta->page_count;
} else {
return 0;
}
if (__improbable(!is_sane_zone_page_metadata(zone, (vm_offset_t)page_meta))) {
panic("zalloc: invalid metadata structure %p for freelist of zone %s\n",
(void *) page_meta, zone->zone_name);
}
assert(PAGE_METADATA_GET_ZONE(page_meta) == zone);
element = (vm_offset_t)page_metadata_get_freelist(page_meta);
if (__improbable(!is_sane_zone_ptr(zone, element, zone->elem_size))) {
panic("zfree: invalid head pointer %p for freelist of zone %s\n",
(void *) element, zone->zone_name);
}
vm_offset_t *primary = (vm_offset_t *) element;
vm_offset_t *backup = get_backup_ptr(zone->elem_size, primary);
vm_offset_t next_element = *primary ^ zp_nopoison_cookie;
vm_offset_t next_element_primary = *primary;
vm_offset_t next_element_backup = *backup;
if (__improbable(!is_sane_zone_element(zone, next_element))) {
backup_ptr_mismatch_panic(zone, element, next_element_primary, next_element_backup);
}
if (__improbable(next_element != (next_element_backup ^ zp_nopoison_cookie))) {
if (__improbable(next_element != (next_element_backup ^ zp_poisoned_cookie))) {
backup_ptr_mismatch_panic(zone, element, next_element_primary, next_element_backup);
}
*check_poison = TRUE;
}
if (__improbable(page_meta != get_zone_page_metadata((struct zone_free_element *)element, FALSE))) {
panic("zalloc: Incorrect metadata %p found in zone %s page queue. Expected metadata: %p\n",
page_meta, zone->zone_name, get_zone_page_metadata((struct zone_free_element *)element, FALSE));
}
if (next_element) {
if (__improbable(page_meta != get_zone_page_metadata((struct zone_free_element *)next_element, FALSE))) {
panic("zalloc: next element pointer %p for element %p points to invalid element for zone %s\n",
(void *)next_element, (void *)element, zone->zone_name);
}
}
page_metadata_set_freelist(page_meta, (struct zone_free_element *)next_element);
page_meta->free_count--;
if (page_meta->free_count == 0) {
re_queue_tail(&zone->pages.all_used, &(page_meta->pages));
} else {
if (!zone->allows_foreign || from_zone_map(element, zone->elem_size)) {
if (get_metadata_alloc_count(page_meta) == page_meta->free_count + 1) {
re_queue_tail(&zone->pages.intermediate, &(page_meta->pages));
}
}
}
zone->countfree--;
zone->count++;
zone->sum_count++;
#if VM_MAX_TAG_ZONES
if (__improbable(zone->tags)) {
ZTAG(zone, element)[0] = (tag << 1);
}
#endif
#if KASAN_ZALLOC
kasan_poison_range(element, zone->elem_size, ASAN_VALID);
#endif
return element;
}
#define ZINFO_SLOTS MAX_ZONES
zone_t zone_find_largest(void);
void zalloc_async(
thread_call_param_t p0,
thread_call_param_t p1);
static thread_call_data_t call_async_alloc;
#define ZONE_ELEMENT_ALIGNMENT 32
#define zone_wakeup(zone) thread_wakeup((event_t)(zone))
#define zone_sleep(zone) \
(void) lck_mtx_sleep(&(zone)->lock, LCK_SLEEP_SPIN_ALWAYS, (event_t)(zone), THREAD_UNINT);
#define lock_zone_init(zone) \
MACRO_BEGIN \
lck_attr_setdefault(&(zone)->lock_attr); \
lck_mtx_init_ext(&(zone)->lock, &(zone)->lock_ext, \
&zone_locks_grp, &(zone)->lock_attr); \
MACRO_END
#define lock_try_zone(zone) lck_mtx_try_lock_spin(&zone->lock)
decl_lck_mtx_data(, zone_gc_lock);
lck_attr_t zone_gc_lck_attr;
lck_grp_t zone_gc_lck_grp;
lck_grp_attr_t zone_gc_lck_grp_attr;
lck_mtx_ext_t zone_gc_lck_ext;
boolean_t zone_gc_allowed = TRUE;
boolean_t panic_include_zprint = FALSE;
mach_memory_info_t *panic_kext_memory_info = NULL;
vm_size_t panic_kext_memory_size = 0;
#define ZALLOC_DEBUG_ZONEGC 0x00000001
#define ZALLOC_DEBUG_ZCRAM 0x00000002
#if DEBUG || DEVELOPMENT
static uint32_t zalloc_debug = 0;
#endif
static boolean_t log_records_init = FALSE;
static int log_records;
#define MAX_NUM_ZONES_ALLOWED_LOGGING 10
static int max_num_zones_to_log = MAX_NUM_ZONES_ALLOWED_LOGGING;
static int num_zones_logged = 0;
static char zone_name_to_log[MAX_ZONE_NAME] = "";
boolean_t corruption_debug_flag = DEBUG;
#if DEBUG || DEVELOPMENT
boolean_t leak_scan_debug_flag = FALSE;
#endif
#if defined(__LP64__)
#define ZRECORDS_MAX 2560
#else
#define ZRECORDS_MAX 1536
#endif
#define ZRECORDS_DEFAULT 1024
int
track_this_zone(const char *zonename, const char *logname)
{
unsigned int len;
const char *zc = zonename;
const char *lc = logname;
for (len = 1; len <= MAX_ZONE_NAME; zc++, lc++, len++) {
if (*zc != *lc && !(*zc == ' ' && *lc == '.')) {
break;
}
if (*zc == '\0') {
return TRUE;
}
}
return FALSE;
}
#define DO_LOGGING(z) (z->zone_logging == TRUE && z->zlog_btlog)
extern boolean_t kmem_alloc_ready;
#if CONFIG_ZLEAKS
#pragma mark -
#pragma mark Zone Leak Detection
#define ZLEAK_STATE_ENABLED 0x01
#define ZLEAK_STATE_ACTIVE 0x02
#define ZLEAK_STATE_ACTIVATING 0x04
#define ZLEAK_STATE_FAILED 0x08
uint32_t zleak_state = 0;
boolean_t panic_include_ztrace = FALSE;
vm_size_t zleak_global_tracking_threshold;
vm_size_t zleak_per_zone_tracking_threshold;
unsigned int zleak_sample_factor = 1000;
unsigned int z_alloc_collisions = 0;
unsigned int z_trace_collisions = 0;
unsigned int z_alloc_overwrites = 0;
unsigned int z_trace_overwrites = 0;
unsigned int z_alloc_recorded = 0;
unsigned int z_trace_recorded = 0;
unsigned int z_total_conflicts = 0;
#pragma mark struct zallocation
struct zallocation {
uintptr_t za_element;
vm_size_t za_size;
uint32_t za_trace_index;
uint32_t za_hit_count;
};
uint32_t zleak_alloc_buckets = CONFIG_ZLEAK_ALLOCATION_MAP_NUM;
uint32_t zleak_trace_buckets = CONFIG_ZLEAK_TRACE_MAP_NUM;
vm_size_t zleak_max_zonemap_size;
static struct zallocation* zallocations;
static struct ztrace* ztraces;
struct ztrace* top_ztrace;
static lck_spin_t zleak_lock;
static lck_attr_t zleak_lock_attr;
static lck_grp_t zleak_lock_grp;
static lck_grp_attr_t zleak_lock_grp_attr;
static void
zleak_init(vm_size_t max_zonemap_size)
{
char scratch_buf[16];
boolean_t zleak_enable_flag = FALSE;
zleak_max_zonemap_size = max_zonemap_size;
zleak_global_tracking_threshold = max_zonemap_size / 2;
zleak_per_zone_tracking_threshold = zleak_global_tracking_threshold / 8;
#if CONFIG_EMBEDDED
if (PE_parse_boot_argn("-zleakon", scratch_buf, sizeof(scratch_buf))) {
zleak_enable_flag = TRUE;
printf("zone leak detection enabled\n");
} else {
zleak_enable_flag = FALSE;
printf("zone leak detection disabled\n");
}
#else
if (PE_parse_boot_argn("-zleakoff", scratch_buf, sizeof(scratch_buf))) {
zleak_enable_flag = FALSE;
printf("zone leak detection disabled\n");
} else {
zleak_enable_flag = TRUE;
printf("zone leak detection enabled\n");
}
#endif
if (PE_parse_boot_argn("zfactor", &zleak_sample_factor, sizeof(zleak_sample_factor))) {
printf("Zone leak factor override: %u\n", zleak_sample_factor);
}
if (PE_parse_boot_argn("zleak-allocs", &zleak_alloc_buckets, sizeof(zleak_alloc_buckets))) {
printf("Zone leak alloc buckets override: %u\n", zleak_alloc_buckets);
if (zleak_alloc_buckets == 0 || (zleak_alloc_buckets & (zleak_alloc_buckets - 1))) {
printf("Override isn't a power of two, bad things might happen!\n");
}
}
if (PE_parse_boot_argn("zleak-traces", &zleak_trace_buckets, sizeof(zleak_trace_buckets))) {
printf("Zone leak trace buckets override: %u\n", zleak_trace_buckets);
if (zleak_trace_buckets == 0 || (zleak_trace_buckets & (zleak_trace_buckets - 1))) {
printf("Override isn't a power of two, bad things might happen!\n");
}
}
lck_grp_attr_setdefault(&zleak_lock_grp_attr);
lck_grp_init(&zleak_lock_grp, "zleak_lock", &zleak_lock_grp_attr);
lck_attr_setdefault(&zleak_lock_attr);
lck_spin_init(&zleak_lock, &zleak_lock_grp, &zleak_lock_attr);
if (zleak_enable_flag) {
zleak_state = ZLEAK_STATE_ENABLED;
}
}
#if CONFIG_ZLEAKS
int
get_zleak_state(void)
{
if (zleak_state & ZLEAK_STATE_FAILED) {
return -1;
}
if (zleak_state & ZLEAK_STATE_ACTIVE) {
return 1;
}
return 0;
}
#endif
kern_return_t
zleak_activate(void)
{
kern_return_t retval;
vm_size_t z_alloc_size = zleak_alloc_buckets * sizeof(struct zallocation);
vm_size_t z_trace_size = zleak_trace_buckets * sizeof(struct ztrace);
void *allocations_ptr = NULL;
void *traces_ptr = NULL;
if (zleak_state & (ZLEAK_STATE_ACTIVE | ZLEAK_STATE_ACTIVATING | ZLEAK_STATE_FAILED)) {
return KERN_SUCCESS;
}
lck_spin_lock(&zleak_lock);
if (zleak_state & (ZLEAK_STATE_ACTIVE | ZLEAK_STATE_ACTIVATING | ZLEAK_STATE_FAILED)) {
lck_spin_unlock(&zleak_lock);
return KERN_SUCCESS;
}
zleak_state |= ZLEAK_STATE_ACTIVATING;
lck_spin_unlock(&zleak_lock);
retval = kmem_alloc_kobject(kernel_map, (vm_offset_t*)&allocations_ptr, z_alloc_size, VM_KERN_MEMORY_OSFMK);
if (retval != KERN_SUCCESS) {
goto fail;
}
retval = kmem_alloc_kobject(kernel_map, (vm_offset_t*)&traces_ptr, z_trace_size, VM_KERN_MEMORY_OSFMK);
if (retval != KERN_SUCCESS) {
goto fail;
}
bzero(allocations_ptr, z_alloc_size);
bzero(traces_ptr, z_trace_size);
zallocations = allocations_ptr;
ztraces = traces_ptr;
top_ztrace = &ztraces[0];
lck_spin_lock(&zleak_lock);
zleak_state |= ZLEAK_STATE_ACTIVE;
zleak_state &= ~ZLEAK_STATE_ACTIVATING;
lck_spin_unlock(&zleak_lock);
return 0;
fail:
lck_spin_lock(&zleak_lock);
zleak_state |= ZLEAK_STATE_FAILED;
zleak_state &= ~ZLEAK_STATE_ACTIVATING;
lck_spin_unlock(&zleak_lock);
if (allocations_ptr != NULL) {
kmem_free(kernel_map, (vm_offset_t)allocations_ptr, z_alloc_size);
}
if (traces_ptr != NULL) {
kmem_free(kernel_map, (vm_offset_t)traces_ptr, z_trace_size);
}
return retval;
}
static boolean_t
zleak_log(uintptr_t* bt,
uintptr_t addr,
uint32_t depth,
vm_size_t allocation_size)
{
if (!lck_spin_try_lock(&zleak_lock)) {
z_total_conflicts++;
return FALSE;
}
struct zallocation* allocation = &zallocations[hashaddr(addr, zleak_alloc_buckets)];
uint32_t trace_index = hashbacktrace(bt, depth, zleak_trace_buckets);
struct ztrace* trace = &ztraces[trace_index];
allocation->za_hit_count++;
trace->zt_hit_count++;
if (allocation->za_element != (uintptr_t) 0 && trace_index == allocation->za_trace_index) {
z_alloc_collisions++;
lck_spin_unlock(&zleak_lock);
return TRUE;
}
if (trace->zt_size > 0 && bcmp(trace->zt_stack, bt, (depth * sizeof(uintptr_t))) != 0) {
trace->zt_collisions++;
z_trace_collisions++;
lck_spin_unlock(&zleak_lock);
return TRUE;
} else if (trace->zt_size > 0) {
trace->zt_size += allocation_size;
} else {
if (trace->zt_depth != 0) {
z_trace_overwrites++;
}
z_trace_recorded++;
trace->zt_size = allocation_size;
memcpy(trace->zt_stack, bt, (depth * sizeof(uintptr_t)));
trace->zt_depth = depth;
trace->zt_collisions = 0;
}
if (allocation->za_element != (uintptr_t) 0) {
z_alloc_collisions++;
struct ztrace* associated_trace = &ztraces[allocation->za_trace_index];
associated_trace->zt_size -= allocation->za_size;
} else if (allocation->za_trace_index != 0) {
z_alloc_overwrites++;
}
allocation->za_element = addr;
allocation->za_trace_index = trace_index;
allocation->za_size = allocation_size;
z_alloc_recorded++;
if (top_ztrace->zt_size < trace->zt_size) {
top_ztrace = trace;
}
lck_spin_unlock(&zleak_lock);
return TRUE;
}
static void
zleak_free(uintptr_t addr,
vm_size_t allocation_size)
{
if (addr == (uintptr_t) 0) {
return;
}
struct zallocation* allocation = &zallocations[hashaddr(addr, zleak_alloc_buckets)];
if (allocation->za_element == addr && allocation->za_trace_index < zleak_trace_buckets) {
lck_spin_lock(&zleak_lock);
if (allocation->za_element == addr && allocation->za_trace_index < zleak_trace_buckets) {
struct ztrace *trace;
if (allocation->za_size != allocation_size) {
panic("Freeing as size %lu memory that was allocated with size %lu\n",
(uintptr_t)allocation_size, (uintptr_t)allocation->za_size);
}
trace = &ztraces[allocation->za_trace_index];
if (trace->zt_size > 0) {
trace->zt_size -= allocation_size;
}
allocation->za_element = 0;
}
lck_spin_unlock(&zleak_lock);
}
}
#endif
uintptr_t
hash_mix(uintptr_t x)
{
#ifndef __LP64__
x += ~(x << 15);
x ^= (x >> 10);
x += (x << 3);
x ^= (x >> 6);
x += ~(x << 11);
x ^= (x >> 16);
#else
x += ~(x << 32);
x ^= (x >> 22);
x += ~(x << 13);
x ^= (x >> 8);
x += (x << 3);
x ^= (x >> 15);
x += ~(x << 27);
x ^= (x >> 31);
#endif
return x;
}
uint32_t
hashbacktrace(uintptr_t* bt, uint32_t depth, uint32_t max_size)
{
uintptr_t hash = 0;
uintptr_t mask = max_size - 1;
while (depth) {
hash += bt[--depth];
}
hash = hash_mix(hash) & mask;
assert(hash < max_size);
return (uint32_t) hash;
}
uint32_t
hashaddr(uintptr_t pt, uint32_t max_size)
{
uintptr_t hash = 0;
uintptr_t mask = max_size - 1;
hash = hash_mix(pt) & mask;
assert(hash < max_size);
return (uint32_t) hash;
}
#pragma mark -
#define ZONE_MAX_ALLOC_SIZE (32 * 1024)
#define ZONE_ALLOC_FRAG_PERCENT(alloc_size, ele_size) (((alloc_size % ele_size) * 100) / alloc_size)
static vm_offset_t zone_names_start;
static vm_offset_t zone_names_next;
static vm_size_t
compute_element_size(vm_size_t requested_size)
{
vm_size_t element_size = requested_size;
vm_size_t minimum_element_size = sizeof(vm_offset_t) * 2;
if (element_size < minimum_element_size) {
element_size = minimum_element_size;
}
element_size = ((element_size - 1) + sizeof(vm_offset_t)) -
((element_size - 1) % sizeof(vm_offset_t));
return element_size;
}
#if KASAN_ZALLOC
static void
kasan_update_element_size_for_redzone(
zone_t zone,
vm_size_t *size,
vm_size_t *max,
const char *name)
{
const char *kalloc_name = "kalloc.";
const char *fakestack_name = "fakestack.";
if (strncmp(name, kalloc_name, strlen(kalloc_name)) == 0) {
zone->kasan_redzone = 0;
} else if (strncmp(name, fakestack_name, strlen(fakestack_name)) == 0) {
zone->kasan_redzone = 0;
} else {
if ((*size % PAGE_SIZE) != 0) {
zone->kasan_redzone = KASAN_GUARD_SIZE;
} else {
zone->kasan_redzone = PAGE_SIZE;
}
*max = (*max / *size) * (*size + zone->kasan_redzone * 2);
*size += zone->kasan_redzone * 2;
}
}
static vm_offset_t
kasan_fixup_allocated_element_address(
zone_t zone,
vm_offset_t addr)
{
if (zone->kasan_redzone) {
addr = kasan_alloc(addr, zone->elem_size,
zone->elem_size - 2 * zone->kasan_redzone, zone->kasan_redzone);
}
return addr;
}
static bool
kasan_quarantine_freed_element(
zone_t *zonep,
void **addrp)
{
zone_t zone = *zonep;
void *addr = *addrp;
vm_size_t usersz = zone->elem_size - 2 * zone->kasan_redzone;
vm_size_t sz = usersz;
if (addr && zone->kasan_redzone) {
kasan_check_free((vm_address_t)addr, usersz, KASAN_HEAP_ZALLOC);
addr = (void *)kasan_dealloc((vm_address_t)addr, &sz);
assert(sz == zone->elem_size);
}
if (addr && zone->kasan_quarantine) {
kasan_free(&addr, &sz, KASAN_HEAP_ZALLOC, zonep, usersz, true);
if (!addr) {
return TRUE;
}
}
*addrp = addr;
return FALSE;
}
#endif
zone_t
zinit(
vm_size_t size,
vm_size_t max,
vm_size_t alloc,
const char *name)
{
zone_t z;
size = compute_element_size(size);
simple_lock(&all_zones_lock, &zone_locks_grp);
assert(num_zones < MAX_ZONES);
assert(num_zones_in_use <= num_zones);
for (int index = bitmap_first(zone_empty_bitmap, MAX_ZONES);
index >= 0 && index < (int)num_zones;
index = bitmap_next(zone_empty_bitmap, index)) {
z = &(zone_array[index]);
if (!strcmp(z->zone_name, name)) {
vm_size_t old_size = z->elem_size;
#if KASAN_ZALLOC
old_size -= z->kasan_redzone * 2;
#endif
if (old_size == size) {
bitmap_clear(zone_empty_bitmap, index);
num_zones_in_use++;
z->zone_valid = TRUE;
z->zone_destruction = FALSE;
simple_unlock(&all_zones_lock);
return z;
}
}
}
bitmap_clear(zone_empty_bitmap, num_zones);
z = &(zone_array[num_zones]);
z->index = num_zones;
num_zones++;
num_zones_in_use++;
lock_zone_init(z);
simple_unlock(&all_zones_lock);
#if KASAN_ZALLOC
kasan_update_element_size_for_redzone(z, &size, &max, name);
#endif
max = round_page(max);
vm_size_t best_alloc = PAGE_SIZE;
if ((size % PAGE_SIZE) == 0) {
best_alloc = size;
} else {
vm_size_t alloc_size;
for (alloc_size = (2 * PAGE_SIZE); alloc_size <= ZONE_MAX_ALLOC_SIZE; alloc_size += PAGE_SIZE) {
if (ZONE_ALLOC_FRAG_PERCENT(alloc_size, size) < ZONE_ALLOC_FRAG_PERCENT(best_alloc, size)) {
best_alloc = alloc_size;
}
}
}
alloc = best_alloc;
if (max && (max < alloc)) {
max = alloc;
}
z->free_elements = NULL;
queue_init(&z->pages.any_free_foreign);
queue_init(&z->pages.all_free);
queue_init(&z->pages.intermediate);
queue_init(&z->pages.all_used);
z->cur_size = 0;
z->page_count = 0;
z->max_size = max;
z->elem_size = size;
z->alloc_size = alloc;
z->count = 0;
z->countfree = 0;
z->count_all_free_pages = 0;
z->sum_count = 0LL;
z->doing_alloc_without_vm_priv = FALSE;
z->doing_alloc_with_vm_priv = FALSE;
z->exhaustible = FALSE;
z->collectable = TRUE;
z->allows_foreign = FALSE;
z->expandable = TRUE;
z->waiting = FALSE;
z->async_pending = FALSE;
z->caller_acct = TRUE;
z->noencrypt = FALSE;
z->no_callout = FALSE;
z->async_prio_refill = FALSE;
z->gzalloc_exempt = FALSE;
z->alignment_required = FALSE;
z->zone_replenishing = FALSE;
z->prio_refill_watermark = 0;
z->zone_replenish_thread = NULL;
z->zp_count = 0;
z->kasan_quarantine = TRUE;
z->zone_valid = TRUE;
z->zone_destruction = FALSE;
z->cpu_cache_enabled = FALSE;
z->clear_memory = FALSE;
#if CONFIG_ZLEAKS
z->zleak_capture = 0;
z->zleak_on = FALSE;
#endif
if (kmem_alloc_ready) {
size_t len = MIN(strlen(name) + 1, MACH_ZONE_NAME_MAX_LEN);
if (zone_names_start == 0 || ((zone_names_next - zone_names_start) + len) > PAGE_SIZE) {
printf("zalloc: allocating memory for zone names buffer\n");
kern_return_t retval = kmem_alloc_kobject(kernel_map, &zone_names_start,
PAGE_SIZE, VM_KERN_MEMORY_OSFMK);
if (retval != KERN_SUCCESS) {
panic("zalloc: zone_names memory allocation failed");
}
bzero((char *)zone_names_start, PAGE_SIZE);
zone_names_next = zone_names_start;
}
strlcpy((char *)zone_names_next, name, len);
z->zone_name = (char *)zone_names_next;
zone_names_next += len;
} else {
z->zone_name = name;
}
if (num_zones_logged < max_num_zones_to_log) {
int i = 1;
boolean_t zone_logging_enabled = FALSE;
char zlog_name[MAX_ZONE_NAME] = "";
while (i <= max_num_zones_to_log) {
snprintf(zlog_name, MAX_ZONE_NAME, "zlog%d", i);
if (PE_parse_boot_argn(zlog_name, zone_name_to_log, sizeof(zone_name_to_log)) == TRUE) {
if (track_this_zone(z->zone_name, zone_name_to_log)) {
if (z->zone_valid) {
z->zone_logging = TRUE;
zone_logging_enabled = TRUE;
num_zones_logged++;
break;
}
}
}
i++;
}
if (zone_logging_enabled == FALSE) {
if (PE_parse_boot_argn("zlog", zone_name_to_log, sizeof(zone_name_to_log)) == TRUE) {
if (track_this_zone(z->zone_name, zone_name_to_log)) {
if (z->zone_valid) {
z->zone_logging = TRUE;
zone_logging_enabled = TRUE;
num_zones_logged++;
}
}
}
}
if (log_records_init == FALSE && zone_logging_enabled == TRUE) {
if (PE_parse_boot_argn("zrecs", &log_records, sizeof(log_records)) == TRUE) {
log_records = MIN(ZRECORDS_MAX, log_records);
log_records_init = TRUE;
} else {
log_records = ZRECORDS_DEFAULT;
log_records_init = TRUE;
}
}
if (kmem_alloc_ready) {
zone_t curr_zone = NULL;
unsigned int max_zones = 0, zone_idx = 0;
simple_lock(&all_zones_lock, &zone_locks_grp);
max_zones = num_zones;
simple_unlock(&all_zones_lock);
for (zone_idx = 0; zone_idx < max_zones; zone_idx++) {
curr_zone = &(zone_array[zone_idx]);
if (!curr_zone->zone_valid) {
continue;
}
if (curr_zone->zone_logging && curr_zone->zlog_btlog == NULL) {
curr_zone->zlog_btlog = btlog_create(log_records, MAX_ZTRACE_DEPTH, (corruption_debug_flag == FALSE) );
if (curr_zone->zlog_btlog) {
printf("zone: logging started for zone %s\n", curr_zone->zone_name);
} else {
printf("zone: couldn't allocate memory for zrecords, turning off zleak logging\n");
curr_zone->zone_logging = FALSE;
}
}
}
}
}
#if CONFIG_GZALLOC
gzalloc_zone_init(z);
#endif
#if CONFIG_ZCACHE
if (cache_all_zones || track_this_zone(name, cache_zone_name)) {
zone_change(z, Z_CACHING_ENABLED, TRUE);
}
#endif
return z;
}
unsigned zone_replenish_loops, zone_replenish_wakeups, zone_replenish_wakeups_initiated, zone_replenish_throttle_count;
static void zone_replenish_thread(zone_t);
__dead2
static void
zone_replenish_thread(zone_t z)
{
vm_size_t free_size;
current_thread()->options |= TH_OPT_VMPRIV;
for (;;) {
lock_zone(z);
assert(z->zone_valid);
z->zone_replenishing = TRUE;
assert(z->prio_refill_watermark != 0);
while ((free_size = (z->cur_size - (z->count * z->elem_size))) < (z->prio_refill_watermark * z->elem_size)) {
assert(z->doing_alloc_without_vm_priv == FALSE);
assert(z->doing_alloc_with_vm_priv == FALSE);
assert(z->async_prio_refill == TRUE);
unlock_zone(z);
int zflags = KMA_KOBJECT | KMA_NOPAGEWAIT;
vm_offset_t space, alloc_size;
kern_return_t kr;
if (vm_pool_low()) {
alloc_size = round_page(z->elem_size);
} else {
alloc_size = z->alloc_size;
}
if (z->noencrypt) {
zflags |= KMA_NOENCRYPT;
}
if (z->clear_memory) {
zflags |= KMA_ZERO;
}
if (is_zone_map_nearing_exhaustion()) {
thread_wakeup((event_t) &vm_pageout_garbage_collect);
}
kr = kernel_memory_allocate(zone_map, &space, alloc_size, 0, zflags, VM_KERN_MEMORY_ZONE);
if (kr == KERN_SUCCESS) {
zcram(z, space, alloc_size);
} else if (kr == KERN_RESOURCE_SHORTAGE) {
VM_PAGE_WAIT();
} else if (kr == KERN_NO_SPACE) {
kr = kernel_memory_allocate(kernel_map, &space, alloc_size, 0, zflags, VM_KERN_MEMORY_ZONE);
if (kr == KERN_SUCCESS) {
zcram(z, space, alloc_size);
} else {
assert_wait_timeout(&z->zone_replenish_thread, THREAD_UNINT, 1, 100 * NSEC_PER_USEC);
thread_block(THREAD_CONTINUE_NULL);
}
}
lock_zone(z);
assert(z->zone_valid);
zone_replenish_loops++;
}
z->zone_replenishing = FALSE;
thread_wakeup(z);
assert_wait(&z->zone_replenish_thread, THREAD_UNINT);
unlock_zone(z);
thread_block(THREAD_CONTINUE_NULL);
zone_replenish_wakeups++;
}
}
void
zone_prio_refill_configure(zone_t z, vm_size_t low_water_mark)
{
z->prio_refill_watermark = low_water_mark;
z->async_prio_refill = TRUE;
OSMemoryBarrier();
kern_return_t tres = kernel_thread_start_priority((thread_continue_t)zone_replenish_thread, z, MAXPRI_KERNEL, &z->zone_replenish_thread);
if (tres != KERN_SUCCESS) {
panic("zone_prio_refill_configure, thread create: 0x%x", tres);
}
thread_deallocate(z->zone_replenish_thread);
}
void
zdestroy(zone_t z)
{
unsigned int zindex;
assert(z != NULL);
lock_zone(z);
assert(z->zone_valid);
assert(z->doing_alloc_without_vm_priv == FALSE);
assert(z->doing_alloc_with_vm_priv == FALSE);
assert(z->async_pending == FALSE);
assert(z->waiting == FALSE);
assert(z->async_prio_refill == FALSE);
#if !KASAN_ZALLOC
z->zone_valid = FALSE;
#endif
z->zone_destruction = TRUE;
unlock_zone(z);
#if CONFIG_ZCACHE
if (zone_caching_enabled(z)) {
panic("zdestroy: Zone caching enabled for zone %s", z->zone_name);
}
#endif
drop_free_elements(z);
#if CONFIG_GZALLOC
gzalloc_empty_free_cache(z);
#endif
lock_zone(z);
#if !KASAN_ZALLOC
assert(z->count == 0);
assert(z->countfree == 0);
assert(z->cur_size == 0);
assert(z->page_count == 0);
assert(z->count_all_free_pages == 0);
assert(queue_empty(&z->pages.all_used));
assert(queue_empty(&z->pages.intermediate));
assert(queue_empty(&z->pages.all_free));
#endif
zindex = z->index;
unlock_zone(z);
simple_lock(&all_zones_lock, &zone_locks_grp);
assert(!bitmap_test(zone_empty_bitmap, zindex));
bitmap_set(zone_empty_bitmap, zindex);
num_zones_in_use--;
assert(num_zones_in_use > 0);
simple_unlock(&all_zones_lock);
}
static inline void
zcram_metadata_init(vm_offset_t newmem, vm_size_t size, struct zone_page_metadata *chunk_metadata)
{
struct zone_page_metadata *page_metadata;
size -= PAGE_SIZE;
newmem += PAGE_SIZE;
for (; size > 0; newmem += PAGE_SIZE, size -= PAGE_SIZE) {
page_metadata = get_zone_page_metadata((struct zone_free_element *)newmem, TRUE);
assert(page_metadata != chunk_metadata);
PAGE_METADATA_SET_ZINDEX(page_metadata, MULTIPAGE_METADATA_MAGIC);
page_metadata_set_realmeta(page_metadata, chunk_metadata);
page_metadata->free_count = 0;
}
return;
}
static void
random_free_to_zone(
zone_t zone,
vm_offset_t newmem,
vm_offset_t first_element_offset,
int element_count,
unsigned int *entropy_buffer)
{
vm_offset_t last_element_offset;
vm_offset_t element_addr;
vm_size_t elem_size;
int index;
assert(element_count && element_count <= ZONE_CHUNK_MAXELEMENTS);
elem_size = zone->elem_size;
last_element_offset = first_element_offset + ((element_count * elem_size) - elem_size);
for (index = 0; index < element_count; index++) {
assert(first_element_offset <= last_element_offset);
if (
#if DEBUG || DEVELOPMENT
leak_scan_debug_flag || __improbable(zone->tags) ||
#endif
random_bool_gen_bits(&zone_bool_gen, entropy_buffer, MAX_ENTROPY_PER_ZCRAM, 1)) {
element_addr = newmem + first_element_offset;
first_element_offset += elem_size;
} else {
element_addr = newmem + last_element_offset;
last_element_offset -= elem_size;
}
if (element_addr != (vm_offset_t)zone) {
zone->count++;
free_to_zone(zone, element_addr, FALSE);
}
zone->cur_size += elem_size;
}
}
void
zcram(
zone_t zone,
vm_offset_t newmem,
vm_size_t size)
{
vm_size_t elem_size;
boolean_t from_zm = FALSE;
int element_count;
unsigned int entropy_buffer[MAX_ENTROPY_PER_ZCRAM] = { 0 };
assert(zone != ZONE_NULL && newmem != (vm_offset_t)0);
assert(!zone->collectable || zone->allows_foreign
|| (from_zone_map(newmem, size)));
elem_size = zone->elem_size;
KDBG(MACHDBG_CODE(DBG_MACH_ZALLOC, ZALLOC_ZCRAM) | DBG_FUNC_START, zone->index, size);
if (from_zone_map(newmem, size)) {
from_zm = TRUE;
}
if (!from_zm) {
assert((zone->allows_foreign == TRUE) && (zone->elem_size <= (PAGE_SIZE - sizeof(struct zone_page_metadata))));
}
#if DEBUG || DEVELOPMENT
if (zalloc_debug & ZALLOC_DEBUG_ZCRAM) {
kprintf("zcram(%p[%s], 0x%lx%s, 0x%lx)\n", zone, zone->zone_name,
(unsigned long)newmem, from_zm ? "" : "[F]", (unsigned long)size);
}
#endif
ZONE_PAGE_COUNT_INCR(zone, (size / PAGE_SIZE));
struct zone_page_metadata *chunk_metadata;
size_t zone_page_metadata_size = sizeof(struct zone_page_metadata);
assert((newmem & PAGE_MASK) == 0);
assert((size & PAGE_MASK) == 0);
chunk_metadata = get_zone_page_metadata((struct zone_free_element *)newmem, TRUE);
chunk_metadata->pages.next = NULL;
chunk_metadata->pages.prev = NULL;
page_metadata_set_freelist(chunk_metadata, 0);
PAGE_METADATA_SET_ZINDEX(chunk_metadata, zone->index);
chunk_metadata->free_count = 0;
assert((size / PAGE_SIZE) <= ZONE_CHUNK_MAXPAGES);
chunk_metadata->page_count = (unsigned)(size / PAGE_SIZE);
zcram_metadata_init(newmem, size, chunk_metadata);
#if VM_MAX_TAG_ZONES
if (__improbable(zone->tags)) {
assert(from_zm);
ztMemoryAdd(zone, newmem, size);
}
#endif
lock_zone(zone);
assert(zone->zone_valid);
enqueue_tail(&zone->pages.all_used, &(chunk_metadata->pages));
if (!from_zm) {
for (; size > 0; newmem += PAGE_SIZE, size -= PAGE_SIZE) {
vm_offset_t first_element_offset = 0;
if (zone_page_metadata_size % ZONE_ELEMENT_ALIGNMENT == 0) {
first_element_offset = zone_page_metadata_size;
} else {
first_element_offset = zone_page_metadata_size + (ZONE_ELEMENT_ALIGNMENT - (zone_page_metadata_size % ZONE_ELEMENT_ALIGNMENT));
}
element_count = (unsigned int)((PAGE_SIZE - first_element_offset) / elem_size);
random_free_to_zone(zone, newmem, first_element_offset, element_count, entropy_buffer);
}
} else {
element_count = (unsigned int)(size / elem_size);
random_free_to_zone(zone, newmem, 0, element_count, entropy_buffer);
}
unlock_zone(zone);
KDBG(MACHDBG_CODE(DBG_MACH_ZALLOC, ZALLOC_ZCRAM) | DBG_FUNC_END, zone->index);
}
int
zfill(
zone_t zone,
int nelem)
{
kern_return_t kr;
vm_offset_t memory;
vm_size_t alloc_size = zone->alloc_size;
vm_size_t elem_per_alloc = alloc_size / zone->elem_size;
vm_size_t nalloc = (nelem + elem_per_alloc - 1) / elem_per_alloc;
int zflags = KMA_KOBJECT;
if (zone->clear_memory) {
zflags |= KMA_ZERO;
}
assert(!zone->allows_foreign);
if (is_zone_map_nearing_exhaustion()) {
thread_wakeup((event_t) &vm_pageout_garbage_collect);
}
kr = kernel_memory_allocate(zone_map, &memory, nalloc * alloc_size, 0, zflags, VM_KERN_MEMORY_ZONE);
if (kr != KERN_SUCCESS) {
printf("%s: kernel_memory_allocate() of %lu bytes failed\n",
__func__, (unsigned long)(nalloc * alloc_size));
return 0;
}
for (vm_size_t i = 0; i < nalloc; i++) {
zcram(zone, memory + i * alloc_size, alloc_size);
}
return (int)(nalloc * elem_per_alloc);
}
void
zone_bootstrap(void)
{
char temp_buf[16];
#if DEBUG || DEVELOPMENT
if (!PE_parse_boot_argn("zalloc_debug", &zalloc_debug, sizeof(zalloc_debug))) {
zalloc_debug = 0;
}
#endif
zp_init();
random_bool_init(&zone_bool_gen);
if (PE_parse_boot_argn("-zc", temp_buf, sizeof(temp_buf))) {
corruption_debug_flag = TRUE;
}
#if DEBUG || DEVELOPMENT
if (PE_parse_boot_argn("-no-copyio-zalloc-check", temp_buf, sizeof(temp_buf))) {
copyio_zalloc_check = FALSE;
}
#if VM_MAX_TAG_ZONES
if (PE_parse_boot_argn("-zt", temp_buf, sizeof(temp_buf))) {
zone_tagging_on = TRUE;
}
#endif
if (PE_parse_boot_argn("-zl", temp_buf, sizeof(temp_buf))) {
leak_scan_debug_flag = TRUE;
}
#endif
simple_lock_init(&all_zones_lock, 0);
num_zones_in_use = 0;
num_zones = 0;
bitmap_full(zone_empty_bitmap, BITMAP_LEN(MAX_ZONES));
zone_names_next = zone_names_start = 0;
#if DEBUG || DEVELOPMENT
simple_lock_init(&zone_test_lock, 0);
#endif
thread_call_setup(&call_async_alloc, zalloc_async, NULL);
lck_grp_attr_setdefault(&zone_locks_grp_attr);
lck_grp_init(&zone_locks_grp, "zone_locks", &zone_locks_grp_attr);
lck_attr_setdefault(&zone_metadata_lock_attr);
lck_mtx_init_ext(&zone_metadata_region_lck, &zone_metadata_region_lck_ext, &zone_locks_grp, &zone_metadata_lock_attr);
#if CONFIG_ZCACHE
if (PE_parse_boot_arg_str("zcc_enable_for_zone_name", cache_zone_name, sizeof(cache_zone_name))) {
printf("zcache: caching enabled for zone %s\n", cache_zone_name);
}
if (PE_parse_boot_argn("-zcache_all", temp_buf, sizeof(temp_buf))) {
cache_all_zones = TRUE;
printf("zcache: caching enabled for all zones\n");
}
#endif
}
#define ZONE_MAP_JETSAM_LIMIT_DEFAULT 95
unsigned int zone_map_jetsam_limit = ZONE_MAP_JETSAM_LIMIT_DEFAULT;
extern pid_t find_largest_process_vm_map_entries(void);
boolean_t memorystatus_kill_on_zone_map_exhaustion(pid_t pid);
void
get_zone_map_size(uint64_t *current_size, uint64_t *capacity)
{
*current_size = zone_map->size;
*capacity = vm_map_max(zone_map) - vm_map_min(zone_map);
}
void
get_largest_zone_info(char *zone_name, size_t zone_name_len, uint64_t *zone_size)
{
zone_t largest_zone = zone_find_largest();
strlcpy(zone_name, largest_zone->zone_name, zone_name_len);
*zone_size = largest_zone->cur_size;
}
boolean_t
is_zone_map_nearing_exhaustion(void)
{
uint64_t size = zone_map->size;
uint64_t capacity = vm_map_max(zone_map) - vm_map_min(zone_map);
if (size > ((capacity * zone_map_jetsam_limit) / 100)) {
return TRUE;
}
return FALSE;
}
extern zone_t vm_map_entry_zone;
extern zone_t vm_object_zone;
#define VMENTRY_TO_VMOBJECT_COMPARISON_RATIO 98
static void
kill_process_in_largest_zone(void)
{
pid_t pid = -1;
zone_t largest_zone = zone_find_largest();
printf("zone_map_exhaustion: Zone map size %lld, capacity %lld [jetsam limit %d%%]\n", (uint64_t)zone_map->size,
(uint64_t)(vm_map_max(zone_map) - vm_map_min(zone_map)), zone_map_jetsam_limit);
printf("zone_map_exhaustion: Largest zone %s, size %lu\n", largest_zone->zone_name, (uintptr_t)largest_zone->cur_size);
assert(current_task() == kernel_task);
if (largest_zone == vm_object_zone) {
unsigned int vm_object_zone_count = vm_object_zone->count;
unsigned int vm_map_entry_zone_count = vm_map_entry_zone->count;
if (vm_map_entry_zone_count >= ((vm_object_zone_count * VMENTRY_TO_VMOBJECT_COMPARISON_RATIO) / 100)) {
largest_zone = vm_map_entry_zone;
printf("zone_map_exhaustion: Picking VM map entries as the zone to target, size %lu\n", (uintptr_t)largest_zone->cur_size);
}
}
if (largest_zone == vm_map_entry_zone) {
pid = find_largest_process_vm_map_entries();
} else {
printf("zone_map_exhaustion: Nothing to do for the largest zone [%s]. Waking up memorystatus thread.\n", largest_zone->zone_name);
}
if (!memorystatus_kill_on_zone_map_exhaustion(pid)) {
printf("zone_map_exhaustion: Call to memorystatus failed, victim pid: %d\n", pid);
}
}
void
zone_init(
vm_size_t max_zonemap_size)
{
kern_return_t retval;
vm_offset_t zone_min;
vm_offset_t zone_max;
vm_offset_t zone_metadata_space;
unsigned int zone_pages;
vm_map_kernel_flags_t vmk_flags;
#if VM_MAX_TAG_ZONES
if (zone_tagging_on) {
ztInit(max_zonemap_size, &zone_locks_grp);
}
#endif
vmk_flags = VM_MAP_KERNEL_FLAGS_NONE;
vmk_flags.vmkf_permanent = TRUE;
retval = kmem_suballoc(kernel_map, &zone_min, max_zonemap_size,
FALSE, VM_FLAGS_ANYWHERE, vmk_flags, VM_KERN_MEMORY_ZONE,
&zone_map);
if (retval != KERN_SUCCESS) {
panic("zone_init: kmem_suballoc failed");
}
zone_max = zone_min + round_page(max_zonemap_size);
#if CONFIG_GZALLOC
gzalloc_init(max_zonemap_size);
#endif
zone_map_min_address = zone_min;
zone_map_max_address = zone_max;
zone_pages = (unsigned int)atop_kernel(zone_max - zone_min);
zone_metadata_space = round_page(zone_pages * sizeof(struct zone_page_metadata));
retval = kernel_memory_allocate(zone_map, &zone_metadata_region_min, zone_metadata_space,
0, KMA_KOBJECT | KMA_VAONLY | KMA_PERMANENT, VM_KERN_MEMORY_OSFMK);
if (retval != KERN_SUCCESS) {
panic("zone_init: zone_metadata_region initialization failed!");
}
zone_metadata_region_max = zone_metadata_region_min + zone_metadata_space;
#if defined(__LP64__)
if ((vm_page_t)(VM_PAGE_UNPACK_PTR(VM_PAGE_PACK_PTR(zone_metadata_region_max))) != (vm_page_t)zone_metadata_region_max) {
panic("VM_PAGE_PACK_PTR failed on zone_metadata_region_max - %p", (void *)zone_metadata_region_max);
}
if ((vm_page_t)(VM_PAGE_UNPACK_PTR(VM_PAGE_PACK_PTR(zone_map_max_address))) != (vm_page_t)zone_map_max_address) {
panic("VM_PAGE_PACK_PTR failed on zone_map_max_address - %p", (void *)zone_map_max_address);
}
#endif
lck_grp_attr_setdefault(&zone_gc_lck_grp_attr);
lck_grp_init(&zone_gc_lck_grp, "zone_gc", &zone_gc_lck_grp_attr);
lck_attr_setdefault(&zone_gc_lck_attr);
lck_mtx_init_ext(&zone_gc_lock, &zone_gc_lck_ext, &zone_gc_lck_grp, &zone_gc_lck_attr);
#if CONFIG_ZLEAKS
zleak_init(max_zonemap_size);
#endif
#if VM_MAX_TAG_ZONES
if (zone_tagging_on) {
vm_allocation_zones_init();
}
#endif
int jetsam_limit_temp = 0;
if (PE_parse_boot_argn("zone_map_jetsam_limit", &jetsam_limit_temp, sizeof(jetsam_limit_temp)) &&
jetsam_limit_temp > 0 && jetsam_limit_temp <= 100) {
zone_map_jetsam_limit = jetsam_limit_temp;
}
}
#pragma mark -
#pragma mark zalloc_canblock
extern boolean_t early_boot_complete;
void
zalloc_poison_element(boolean_t check_poison, zone_t zone, vm_offset_t addr)
{
vm_offset_t inner_size = zone->elem_size;
if (__improbable(check_poison && addr)) {
vm_offset_t *element_cursor = ((vm_offset_t *) addr) + 1;
vm_offset_t *backup = get_backup_ptr(inner_size, (vm_offset_t *) addr);
for (; element_cursor < backup; element_cursor++) {
if (__improbable(*element_cursor != ZP_POISON)) {
zone_element_was_modified_panic(zone,
addr,
*element_cursor,
ZP_POISON,
((vm_offset_t)element_cursor) - addr);
}
}
}
if (addr) {
vm_offset_t *primary = (vm_offset_t *) addr;
vm_offset_t *backup = get_backup_ptr(inner_size, primary);
*primary = ZP_POISON;
*backup = ZP_POISON;
}
}
#define VM_MAP_ENTRY_RESERVE_CNT 8
static void *
zalloc_internal(
zone_t zone,
boolean_t canblock,
boolean_t nopagewait,
vm_size_t
#if !VM_MAX_TAG_ZONES
__unused
#endif
reqsize,
vm_tag_t tag)
{
vm_offset_t addr = 0;
kern_return_t retval;
uintptr_t zbt[MAX_ZTRACE_DEPTH];
unsigned int numsaved = 0;
thread_t thr = current_thread();
boolean_t check_poison = FALSE;
boolean_t set_doing_alloc_with_vm_priv = FALSE;
#if CONFIG_ZLEAKS
uint32_t zleak_tracedepth = 0;
#endif
#if KASAN
boolean_t irq_safe = FALSE;
const char *fakestack_name = "fakestack.";
if (strncmp(zone->zone_name, fakestack_name, strlen(fakestack_name)) == 0) {
irq_safe = TRUE;
}
#elif MACH_ASSERT
const boolean_t irq_safe = FALSE;
#endif
assert(zone != ZONE_NULL);
assert(irq_safe || ml_get_interrupts_enabled() || ml_is_quiescing() || debug_mode_active() || !early_boot_complete);
#if CONFIG_GZALLOC
addr = gzalloc_alloc(zone, canblock);
#endif
if (__improbable(DO_LOGGING(zone))) {
numsaved = OSBacktrace((void*) zbt, MAX_ZTRACE_DEPTH);
}
#if CONFIG_ZLEAKS
if (__improbable(zone->zleak_on && sample_counter(&zone->zleak_capture, zleak_sample_factor) == TRUE)) {
if (numsaved == 0) {
zleak_tracedepth = backtrace(zbt, MAX_ZTRACE_DEPTH, NULL);
} else {
zleak_tracedepth = numsaved;
}
}
#endif
#if VM_MAX_TAG_ZONES
if (__improbable(zone->tags)) {
vm_tag_will_update_zone(tag, zone->tag_zone_index);
}
#endif
#if CONFIG_ZCACHE
if (__probable(addr == 0)) {
if (zone_caching_enabled(zone)) {
addr = zcache_alloc_from_cpu_cache(zone);
if (addr) {
#if KASAN_ZALLOC
addr = kasan_fixup_allocated_element_address(zone, addr);
#endif
if (__improbable(DO_LOGGING(zone) && addr)) {
btlog_add_entry(zone->zlog_btlog, (void *)addr,
ZOP_ALLOC, (void **)zbt, numsaved);
}
DTRACE_VM2(zalloc, zone_t, zone, void*, addr);
return (void *)addr;
}
}
}
#endif
lock_zone(zone);
assert(zone->zone_valid);
if (zone->async_prio_refill && zone->zone_replenish_thread) {
vm_size_t curr_free;
vm_size_t refill_level;
const vm_size_t reserved_min = VM_MAP_ENTRY_RESERVE_CNT * zone->elem_size;
for (;;) {
curr_free = (zone->cur_size - (zone->count * zone->elem_size));
refill_level = zone->prio_refill_watermark * zone->elem_size;
if (curr_free > refill_level) {
break;
}
zone_replenish_wakeups_initiated++;
thread_wakeup(&zone->zone_replenish_thread);
if (curr_free > refill_level / 2 ||
((thr->options & TH_OPT_VMPRIV) && curr_free > reserved_min) ||
(thr->options & TH_OPT_ZONE_GC)) {
break;
}
zone_replenish_throttle_count++;
unlock_zone(zone);
assert_wait_timeout(zone, THREAD_UNINT, 1, NSEC_PER_MSEC);
thread_block(THREAD_CONTINUE_NULL);
lock_zone(zone);
assert(zone->zone_valid);
}
}
if (__probable(addr == 0)) {
addr = try_alloc_from_zone(zone, tag, &check_poison);
}
if ((thr->options & TH_OPT_ZONE_GC) && zone->async_prio_refill) {
assert(addr != 0);
}
while ((addr == 0) && canblock) {
if ((zone->doing_alloc_without_vm_priv || zone->doing_alloc_with_vm_priv) &&
(((thr->options & TH_OPT_VMPRIV) == 0) || zone->doing_alloc_with_vm_priv)) {
zone->waiting = TRUE;
zone_sleep(zone);
} else {
vm_offset_t space;
vm_size_t alloc_size;
int retry = 0;
if ((zone->cur_size + zone->elem_size) >
zone->max_size) {
if (zone->exhaustible) {
break;
}
if (zone->expandable) {
zone->max_size += (zone->max_size >> 1);
} else {
unlock_zone(zone);
panic_include_zprint = TRUE;
#if CONFIG_ZLEAKS
if (zleak_state & ZLEAK_STATE_ACTIVE) {
panic_include_ztrace = TRUE;
}
#endif
panic("zalloc: zone \"%s\" empty.", zone->zone_name);
}
}
set_thread_rwlock_boost();
if ((thr->options & TH_OPT_VMPRIV)) {
zone->doing_alloc_with_vm_priv = TRUE;
set_doing_alloc_with_vm_priv = TRUE;
} else {
zone->doing_alloc_without_vm_priv = TRUE;
}
unlock_zone(zone);
for (;;) {
int zflags = KMA_KOBJECT | KMA_NOPAGEWAIT;
if (vm_pool_low() || retry >= 1) {
alloc_size =
round_page(zone->elem_size);
} else {
alloc_size = zone->alloc_size;
}
if (zone->noencrypt) {
zflags |= KMA_NOENCRYPT;
}
if (zone->clear_memory) {
zflags |= KMA_ZERO;
}
if (is_zone_map_nearing_exhaustion()) {
thread_wakeup((event_t) &vm_pageout_garbage_collect);
}
retval = kernel_memory_allocate(zone_map, &space, alloc_size, 0, zflags, VM_KERN_MEMORY_ZONE);
if (retval == KERN_SUCCESS) {
#if CONFIG_ZLEAKS
if ((zleak_state & (ZLEAK_STATE_ENABLED | ZLEAK_STATE_ACTIVE)) == ZLEAK_STATE_ENABLED) {
if (zone_map->size >= zleak_global_tracking_threshold) {
kern_return_t kr;
kr = zleak_activate();
if (kr != KERN_SUCCESS) {
printf("Failed to activate live zone leak debugging (%d).\n", kr);
}
}
}
if ((zleak_state & ZLEAK_STATE_ACTIVE) && !(zone->zleak_on)) {
if (zone->cur_size > zleak_per_zone_tracking_threshold) {
zone->zleak_on = TRUE;
}
}
#endif
zcram(zone, space, alloc_size);
break;
} else if (retval != KERN_RESOURCE_SHORTAGE) {
retry++;
if (retry == 3) {
panic_include_zprint = TRUE;
#if CONFIG_ZLEAKS
if ((zleak_state & ZLEAK_STATE_ACTIVE)) {
panic_include_ztrace = TRUE;
}
#endif
if (retval == KERN_NO_SPACE) {
zone_t zone_largest = zone_find_largest();
panic("zalloc: zone map exhausted while allocating from zone %s, likely due to memory leak in zone %s (%lu total bytes, %d elements allocated)",
zone->zone_name, zone_largest->zone_name,
(unsigned long)zone_largest->cur_size, zone_largest->count);
}
panic("zalloc: \"%s\" (%d elements) retry fail %d", zone->zone_name, zone->count, retval);
}
} else {
break;
}
}
lock_zone(zone);
assert(zone->zone_valid);
if (set_doing_alloc_with_vm_priv == TRUE) {
zone->doing_alloc_with_vm_priv = FALSE;
} else {
zone->doing_alloc_without_vm_priv = FALSE;
}
if (zone->waiting) {
zone->waiting = FALSE;
zone_wakeup(zone);
}
clear_thread_rwlock_boost();
addr = try_alloc_from_zone(zone, tag, &check_poison);
if (addr == 0 &&
retval == KERN_RESOURCE_SHORTAGE) {
if (nopagewait == TRUE) {
break;
}
unlock_zone(zone);
VM_PAGE_WAIT();
lock_zone(zone);
assert(zone->zone_valid);
}
}
if (addr == 0) {
addr = try_alloc_from_zone(zone, tag, &check_poison);
}
}
#if CONFIG_ZLEAKS
if (addr && zleak_tracedepth > 0) {
if (!zleak_log(zbt, addr, zleak_tracedepth, zone->elem_size)) {
zone->zleak_capture = zleak_sample_factor;
}
}
#endif
if ((addr == 0) && (!canblock || nopagewait) && (zone->async_pending == FALSE) && (zone->no_callout == FALSE) && (zone->exhaustible == FALSE) && (!vm_pool_low())) {
zone->async_pending = TRUE;
unlock_zone(zone);
thread_call_enter(&call_async_alloc);
lock_zone(zone);
assert(zone->zone_valid);
addr = try_alloc_from_zone(zone, tag, &check_poison);
}
#if VM_MAX_TAG_ZONES
if (__improbable(zone->tags) && addr) {
if (reqsize) {
reqsize = zone->elem_size - reqsize;
}
vm_tag_update_zone_size(tag, zone->tag_zone_index, zone->elem_size, reqsize);
}
#endif
unlock_zone(zone);
if (__improbable(DO_LOGGING(zone) && addr)) {
btlog_add_entry(zone->zlog_btlog, (void *)addr, ZOP_ALLOC, (void **)zbt, numsaved);
}
zalloc_poison_element(check_poison, zone, addr);
if (addr) {
#if DEBUG || DEVELOPMENT
if (__improbable(leak_scan_debug_flag && !(zone->elem_size & (sizeof(uintptr_t) - 1)))) {
unsigned int count, idx;
if (numsaved == 0) {
numsaved = backtrace(zbt, MAX_ZTRACE_DEPTH, NULL);
}
count = (unsigned int)(zone->elem_size / sizeof(uintptr_t));
if (count >= numsaved) {
count = numsaved - 1;
}
for (idx = 0; idx < count; idx++) {
((uintptr_t *)addr)[count - 1 - idx] = zbt[idx + 1];
}
}
#endif
}
TRACE_MACHLEAKS(ZALLOC_CODE, ZALLOC_CODE_2, zone->elem_size, addr);
#if KASAN_ZALLOC
addr = kasan_fixup_allocated_element_address(zone, addr);
#endif
DTRACE_VM2(zalloc, zone_t, zone, void*, addr);
return (void *)addr;
}
void *
zalloc(zone_t zone)
{
return zalloc_internal(zone, TRUE, FALSE, 0, VM_KERN_MEMORY_NONE);
}
void *
zalloc_noblock(zone_t zone)
{
return zalloc_internal(zone, FALSE, FALSE, 0, VM_KERN_MEMORY_NONE);
}
void *
zalloc_nopagewait(zone_t zone)
{
return zalloc_internal(zone, TRUE, TRUE, 0, VM_KERN_MEMORY_NONE);
}
void *
zalloc_canblock_tag(zone_t zone, boolean_t canblock, vm_size_t reqsize, vm_tag_t tag)
{
return zalloc_internal(zone, canblock, FALSE, reqsize, tag);
}
void *
zalloc_canblock(zone_t zone, boolean_t canblock)
{
return zalloc_internal(zone, canblock, FALSE, 0, VM_KERN_MEMORY_NONE);
}
void *
zalloc_attempt(zone_t zone)
{
boolean_t check_poison = FALSE;
vm_offset_t addr = try_alloc_from_zone(zone, VM_KERN_MEMORY_NONE, &check_poison);
zalloc_poison_element(check_poison, zone, addr);
return (void *)addr;
}
void
zfree_direct(zone_t zone, vm_offset_t elem)
{
boolean_t poison = zfree_poison_element(zone, elem);
free_to_zone(zone, elem, poison);
}
void
zalloc_async(
__unused thread_call_param_t p0,
__unused thread_call_param_t p1)
{
zone_t current_z = NULL;
unsigned int max_zones, i;
void *elt = NULL;
boolean_t pending = FALSE;
simple_lock(&all_zones_lock, &zone_locks_grp);
max_zones = num_zones;
simple_unlock(&all_zones_lock);
for (i = 0; i < max_zones; i++) {
current_z = &(zone_array[i]);
if (current_z->no_callout == TRUE) {
continue;
}
lock_zone(current_z);
if (current_z->zone_valid && current_z->async_pending == TRUE) {
current_z->async_pending = FALSE;
pending = TRUE;
}
unlock_zone(current_z);
if (pending == TRUE) {
elt = zalloc_canblock_tag(current_z, TRUE, 0, VM_KERN_MEMORY_OSFMK);
zfree(current_z, elt);
pending = FALSE;
}
}
}
void *
zget(
zone_t zone)
{
return zalloc_internal(zone, FALSE, TRUE, 0, VM_KERN_MEMORY_NONE);
}
boolean_t zone_check = FALSE;
static void
zone_check_freelist(zone_t zone, vm_offset_t elem)
{
struct zone_free_element *this;
struct zone_page_metadata *thispage;
if (zone->allows_foreign) {
for (thispage = (struct zone_page_metadata *)queue_first(&zone->pages.any_free_foreign);
!queue_end(&zone->pages.any_free_foreign, &(thispage->pages));
thispage = (struct zone_page_metadata *)queue_next(&(thispage->pages))) {
for (this = page_metadata_get_freelist(thispage);
this != NULL;
this = this->next) {
if (!is_sane_zone_element(zone, (vm_address_t)this) || (vm_address_t)this == elem) {
panic("zone_check_freelist");
}
}
}
}
for (thispage = (struct zone_page_metadata *)queue_first(&zone->pages.all_free);
!queue_end(&zone->pages.all_free, &(thispage->pages));
thispage = (struct zone_page_metadata *)queue_next(&(thispage->pages))) {
for (this = page_metadata_get_freelist(thispage);
this != NULL;
this = this->next) {
if (!is_sane_zone_element(zone, (vm_address_t)this) || (vm_address_t)this == elem) {
panic("zone_check_freelist");
}
}
}
for (thispage = (struct zone_page_metadata *)queue_first(&zone->pages.intermediate);
!queue_end(&zone->pages.intermediate, &(thispage->pages));
thispage = (struct zone_page_metadata *)queue_next(&(thispage->pages))) {
for (this = page_metadata_get_freelist(thispage);
this != NULL;
this = this->next) {
if (!is_sane_zone_element(zone, (vm_address_t)this) || (vm_address_t)this == elem) {
panic("zone_check_freelist");
}
}
}
}
boolean_t
zfree_poison_element(zone_t zone, vm_offset_t elem)
{
boolean_t poison = FALSE;
if (zp_factor != 0 || zp_tiny_zone_limit != 0) {
vm_offset_t inner_size = zone->elem_size;
uint32_t sample_factor = zp_factor + (((uint32_t)inner_size) >> zp_scale);
if (inner_size <= zp_tiny_zone_limit) {
poison = TRUE;
} else if (zp_factor != 0 && sample_counter(&zone->zp_count, sample_factor) == TRUE) {
poison = TRUE;
}
if (__improbable(poison)) {
vm_offset_t *element_cursor = ((vm_offset_t *) elem) + 1;
vm_offset_t *backup = get_backup_ptr(inner_size, (vm_offset_t *)elem);
for (; element_cursor < backup; element_cursor++) {
*element_cursor = ZP_POISON;
}
}
}
return poison;
}
void
(zfree)(
zone_t zone,
void *addr)
{
vm_offset_t elem = (vm_offset_t) addr;
uintptr_t zbt[MAX_ZTRACE_DEPTH];
unsigned int numsaved = 0;
boolean_t gzfreed = FALSE;
boolean_t poison = FALSE;
#if VM_MAX_TAG_ZONES
vm_tag_t tag;
#endif
assert(zone != ZONE_NULL);
DTRACE_VM2(zfree, zone_t, zone, void*, addr);
#if KASAN_ZALLOC
if (kasan_quarantine_freed_element(&zone, &addr)) {
return;
}
elem = (vm_offset_t)addr;
#endif
if (__improbable(DO_LOGGING(zone) && corruption_debug_flag)) {
numsaved = OSBacktrace((void *)zbt, MAX_ZTRACE_DEPTH);
}
#if MACH_ASSERT
if (zone == ZONE_NULL || elem == (vm_offset_t)0) {
panic("zfree: NULL");
}
#endif
#if CONFIG_GZALLOC
gzfreed = gzalloc_free(zone, addr);
#endif
if (!gzfreed) {
struct zone_page_metadata *page_meta = get_zone_page_metadata((struct zone_free_element *)addr, FALSE);
if (zone != PAGE_METADATA_GET_ZONE(page_meta)) {
panic("Element %p from zone %s caught being freed to wrong zone %s\n", addr, PAGE_METADATA_GET_ZONE(page_meta)->zone_name, zone->zone_name);
}
}
TRACE_MACHLEAKS(ZFREE_CODE, ZFREE_CODE_2, zone->elem_size, (uintptr_t)addr);
if (__improbable(!gzfreed && zone->collectable && !zone->allows_foreign &&
!from_zone_map(elem, zone->elem_size))) {
panic("zfree: non-allocated memory in collectable zone!");
}
if (!gzfreed) {
poison = zfree_poison_element(zone, elem);
}
if (__improbable(DO_LOGGING(zone))) {
if (corruption_debug_flag) {
btlog_add_entry(zone->zlog_btlog, (void *)addr, ZOP_FREE, (void **)zbt, numsaved);
} else {
btlog_remove_entries_for_element(zone->zlog_btlog, (void *)addr);
}
}
#if CONFIG_ZCACHE
if (zone_caching_enabled(zone)) {
int __assert_only ret = zcache_free_to_cpu_cache(zone, addr);
assert(ret != FALSE);
return;
}
#endif
lock_zone(zone);
assert(zone->zone_valid);
if (zone_check) {
zone_check_freelist(zone, elem);
}
if (__probable(!gzfreed)) {
#if VM_MAX_TAG_ZONES
if (__improbable(zone->tags)) {
tag = (ZTAG(zone, elem)[0] >> 1);
ZTAG(zone, elem)[0] = 0xFFFE;
}
#endif
free_to_zone(zone, elem, poison);
}
if (__improbable(zone->count < 0)) {
panic("zfree: zone count underflow in zone %s while freeing element %p, possible cause: double frees or freeing memory that did not come from this zone",
zone->zone_name, addr);
}
#if CONFIG_ZLEAKS
if (zone->zleak_on) {
zleak_free(elem, zone->elem_size);
}
#endif
#if VM_MAX_TAG_ZONES
if (__improbable(zone->tags) && __probable(!gzfreed)) {
vm_tag_update_zone_size(tag, zone->tag_zone_index, -((int64_t)zone->elem_size), 0);
}
#endif
unlock_zone(zone);
}
void
zone_change(
zone_t zone,
unsigned int item,
boolean_t value)
{
assert( zone != ZONE_NULL );
assert( value == TRUE || value == FALSE );
switch (item) {
case Z_NOENCRYPT:
zone->noencrypt = value;
break;
case Z_EXHAUST:
zone->exhaustible = value;
break;
case Z_COLLECT:
zone->collectable = value;
break;
case Z_EXPAND:
zone->expandable = value;
break;
case Z_FOREIGN:
zone->allows_foreign = value;
break;
case Z_CALLERACCT:
zone->caller_acct = value;
break;
case Z_NOCALLOUT:
zone->no_callout = value;
break;
case Z_TAGS_ENABLED:
#if VM_MAX_TAG_ZONES
{
static int tag_zone_index;
zone->tags = TRUE;
zone->tags_inline = (((page_size + zone->elem_size - 1) / zone->elem_size) <= (sizeof(uint32_t) / sizeof(uint16_t)));
zone->tag_zone_index = OSAddAtomic(1, &tag_zone_index);
}
#endif
break;
case Z_GZALLOC_EXEMPT:
zone->gzalloc_exempt = value;
#if CONFIG_GZALLOC
gzalloc_reconfigure(zone);
#endif
break;
case Z_ALIGNMENT_REQUIRED:
zone->alignment_required = value;
#if KASAN_ZALLOC
if (zone->kasan_redzone == KASAN_GUARD_SIZE) {
zone->elem_size -= zone->kasan_redzone * 2;
zone->kasan_redzone = 0;
}
#endif
#if CONFIG_GZALLOC
gzalloc_reconfigure(zone);
#endif
break;
case Z_KASAN_QUARANTINE:
zone->kasan_quarantine = value;
break;
case Z_CACHING_ENABLED:
#if CONFIG_ZCACHE
if (value == TRUE) {
#if CONFIG_GZALLOC
if (gzalloc_enabled()) {
break;
}
#endif
if (zcache_ready()) {
zcache_init(zone);
} else {
zone->cpu_cache_enable_when_ready = TRUE;
}
}
#endif
break;
case Z_CLEARMEMORY:
zone->clear_memory = value;
break;
default:
panic("Zone_change: Wrong Item Type!");
}
}
integer_t
zone_free_count(zone_t zone)
{
integer_t free_count;
lock_zone(zone);
free_count = zone->countfree;
unlock_zone(zone);
assert(free_count >= 0);
return free_count;
}
void
drop_free_elements(zone_t z)
{
vm_size_t elt_size;
unsigned int total_freed_pages = 0;
struct zone_page_metadata *page_meta;
vm_address_t free_page_address;
vm_size_t size_to_free;
lock_zone(z);
elt_size = z->elem_size;
while (!queue_empty(&z->pages.all_free)) {
page_meta = (struct zone_page_metadata *)queue_first(&z->pages.all_free);
assert(from_zone_map((vm_address_t)page_meta, sizeof(*page_meta)));
if (!z->zone_destruction &&
z->async_prio_refill && z->zone_replenish_thread &&
(vm_size_t)(page_meta->free_count - z->countfree) < z->prio_refill_watermark) {
break;
}
(void)dequeue_head(&z->pages.all_free);
assert(z->countfree >= page_meta->free_count);
z->countfree -= page_meta->free_count;
assert(z->count_all_free_pages >= page_meta->page_count);
z->count_all_free_pages -= page_meta->page_count;
assert(z->cur_size >= page_meta->free_count * elt_size);
z->cur_size -= page_meta->free_count * elt_size;
ZONE_PAGE_COUNT_DECR(z, page_meta->page_count);
unlock_zone(z);
free_page_address = get_zone_page(page_meta);
total_freed_pages += page_meta->page_count;
size_to_free = page_meta->page_count * PAGE_SIZE;
#if KASAN_ZALLOC
kasan_poison_range(free_page_address, size_to_free, ASAN_VALID);
#endif
#if VM_MAX_TAG_ZONES
if (z->tags) {
ztMemoryRemove(z, free_page_address, size_to_free);
}
#endif
kmem_free(zone_map, free_page_address, size_to_free);
if (current_thread()->options & TH_OPT_ZONE_GC) {
thread_yield_to_preemption();
}
lock_zone(z);
}
if (z->zone_destruction) {
assert(queue_empty(&z->pages.all_free));
assert(z->count_all_free_pages == 0);
}
unlock_zone(z);
#if DEBUG || DEVELOPMENT
if (zalloc_debug & ZALLOC_DEBUG_ZONEGC) {
kprintf("zone_gc() of zone %s freed %lu elements, %d pages\n", z->zone_name,
(unsigned long)((total_freed_pages * PAGE_SIZE) / elt_size), total_freed_pages);
}
#endif
}
void
zone_gc(boolean_t consider_jetsams)
{
unsigned int max_zones;
zone_t z;
unsigned int i;
if (consider_jetsams) {
kill_process_in_largest_zone();
}
lck_mtx_lock(&zone_gc_lock);
current_thread()->options |= TH_OPT_ZONE_GC;
simple_lock(&all_zones_lock, &zone_locks_grp);
max_zones = num_zones;
simple_unlock(&all_zones_lock);
#if DEBUG || DEVELOPMENT
if (zalloc_debug & ZALLOC_DEBUG_ZONEGC) {
kprintf("zone_gc() starting...\n");
}
#endif
for (i = 0; i < max_zones; i++) {
z = &(zone_array[i]);
assert(z != ZONE_NULL);
if (!z->collectable) {
continue;
}
#if CONFIG_ZCACHE
if (zone_caching_enabled(z)) {
zcache_drain_depot(z);
}
#endif
if (queue_empty(&z->pages.all_free)) {
continue;
}
drop_free_elements(z);
}
current_thread()->options &= ~TH_OPT_ZONE_GC;
lck_mtx_unlock(&zone_gc_lock);
}
extern vm_offset_t kmapoff_kaddr;
extern unsigned int kmapoff_pgcnt;
void
consider_zone_gc(boolean_t consider_jetsams)
{
if (kmapoff_kaddr != 0) {
(void) vm_deallocate(kernel_map,
kmapoff_kaddr, kmapoff_pgcnt * PAGE_SIZE_64);
kmapoff_kaddr = 0;
}
if (zone_gc_allowed) {
zone_gc(consider_jetsams);
}
}
vm_map_copy_t
create_vm_map_copy(
vm_offset_t start_addr,
vm_size_t total_size,
vm_size_t used_size)
{
kern_return_t kr;
vm_offset_t end_addr;
vm_size_t free_size;
vm_map_copy_t copy;
if (used_size != total_size) {
end_addr = start_addr + used_size;
free_size = total_size - (round_page(end_addr) - start_addr);
if (free_size >= PAGE_SIZE) {
kmem_free(ipc_kernel_map,
round_page(end_addr), free_size);
}
bzero((char *) end_addr, round_page(end_addr) - end_addr);
}
kr = vm_map_copyin(ipc_kernel_map, (vm_map_address_t)start_addr,
(vm_map_size_t)used_size, TRUE, ©);
assert(kr == KERN_SUCCESS);
return copy;
}
boolean_t
get_zone_info(
zone_t z,
mach_zone_name_t *zn,
mach_zone_info_t *zi)
{
struct zone zcopy;
assert(z != ZONE_NULL);
lock_zone(z);
if (!z->zone_valid) {
unlock_zone(z);
return FALSE;
}
zcopy = *z;
unlock_zone(z);
if (zn != NULL) {
(void) __nosan_strlcpy(zn->mzn_name, zcopy.zone_name,
strlen(zcopy.zone_name) + 1);
}
if (zi != NULL) {
zi->mzi_count = (uint64_t)zcopy.count;
zi->mzi_cur_size = ptoa_64(zcopy.page_count);
zi->mzi_max_size = (uint64_t)zcopy.max_size;
zi->mzi_elem_size = (uint64_t)zcopy.elem_size;
zi->mzi_alloc_size = (uint64_t)zcopy.alloc_size;
zi->mzi_sum_size = zcopy.sum_count * zcopy.elem_size;
zi->mzi_exhaustible = (uint64_t)zcopy.exhaustible;
zi->mzi_collectable = 0;
if (zcopy.collectable) {
SET_MZI_COLLECTABLE_BYTES(zi->mzi_collectable, ((uint64_t)zcopy.count_all_free_pages * PAGE_SIZE));
SET_MZI_COLLECTABLE_FLAG(zi->mzi_collectable, TRUE);
}
}
return TRUE;
}
kern_return_t
task_zone_info(
__unused task_t task,
__unused mach_zone_name_array_t *namesp,
__unused mach_msg_type_number_t *namesCntp,
__unused task_zone_info_array_t *infop,
__unused mach_msg_type_number_t *infoCntp)
{
return KERN_FAILURE;
}
kern_return_t
mach_zone_info(
host_priv_t host,
mach_zone_name_array_t *namesp,
mach_msg_type_number_t *namesCntp,
mach_zone_info_array_t *infop,
mach_msg_type_number_t *infoCntp)
{
return mach_memory_info(host, namesp, namesCntp, infop, infoCntp, NULL, NULL);
}
kern_return_t
mach_memory_info(
host_priv_t host,
mach_zone_name_array_t *namesp,
mach_msg_type_number_t *namesCntp,
mach_zone_info_array_t *infop,
mach_msg_type_number_t *infoCntp,
mach_memory_info_array_t *memoryInfop,
mach_msg_type_number_t *memoryInfoCntp)
{
mach_zone_name_t *names;
vm_offset_t names_addr;
vm_size_t names_size;
mach_zone_info_t *info;
vm_offset_t info_addr;
vm_size_t info_size;
mach_memory_info_t *memory_info;
vm_offset_t memory_info_addr;
vm_size_t memory_info_size;
vm_size_t memory_info_vmsize;
unsigned int num_info;
unsigned int max_zones, used_zones, i;
mach_zone_name_t *zn;
mach_zone_info_t *zi;
kern_return_t kr;
uint64_t zones_collectable_bytes = 0;
if (host == HOST_NULL) {
return KERN_INVALID_HOST;
}
#if CONFIG_DEBUGGER_FOR_ZONE_INFO
if (!PE_i_can_has_debugger(NULL)) {
return KERN_INVALID_HOST;
}
#endif
simple_lock(&all_zones_lock, &zone_locks_grp);
max_zones = (unsigned int)(num_zones);
simple_unlock(&all_zones_lock);
names_size = round_page(max_zones * sizeof *names);
kr = kmem_alloc_pageable(ipc_kernel_map,
&names_addr, names_size, VM_KERN_MEMORY_IPC);
if (kr != KERN_SUCCESS) {
return kr;
}
names = (mach_zone_name_t *) names_addr;
info_size = round_page(max_zones * sizeof *info);
kr = kmem_alloc_pageable(ipc_kernel_map,
&info_addr, info_size, VM_KERN_MEMORY_IPC);
if (kr != KERN_SUCCESS) {
kmem_free(ipc_kernel_map,
names_addr, names_size);
return kr;
}
info = (mach_zone_info_t *) info_addr;
zn = &names[0];
zi = &info[0];
used_zones = max_zones;
for (i = 0; i < max_zones; i++) {
if (!get_zone_info(&(zone_array[i]), zn, zi)) {
used_zones--;
continue;
}
zones_collectable_bytes += GET_MZI_COLLECTABLE_BYTES(zi->mzi_collectable);
zn++;
zi++;
}
*namesp = (mach_zone_name_t *) create_vm_map_copy(names_addr, names_size, used_zones * sizeof *names);
*namesCntp = used_zones;
*infop = (mach_zone_info_t *) create_vm_map_copy(info_addr, info_size, used_zones * sizeof *info);
*infoCntp = used_zones;
num_info = 0;
memory_info_addr = 0;
if (memoryInfop && memoryInfoCntp) {
vm_map_copy_t copy;
num_info = vm_page_diagnose_estimate();
memory_info_size = num_info * sizeof(*memory_info);
memory_info_vmsize = round_page(memory_info_size);
kr = kmem_alloc_pageable(ipc_kernel_map,
&memory_info_addr, memory_info_vmsize, VM_KERN_MEMORY_IPC);
if (kr != KERN_SUCCESS) {
return kr;
}
kr = vm_map_wire_kernel(ipc_kernel_map, memory_info_addr, memory_info_addr + memory_info_vmsize,
VM_PROT_READ | VM_PROT_WRITE, VM_KERN_MEMORY_IPC, FALSE);
assert(kr == KERN_SUCCESS);
memory_info = (mach_memory_info_t *) memory_info_addr;
vm_page_diagnose(memory_info, num_info, zones_collectable_bytes);
kr = vm_map_unwire(ipc_kernel_map, memory_info_addr, memory_info_addr + memory_info_vmsize, FALSE);
assert(kr == KERN_SUCCESS);
kr = vm_map_copyin(ipc_kernel_map, (vm_map_address_t)memory_info_addr,
(vm_map_size_t)memory_info_size, TRUE, ©);
assert(kr == KERN_SUCCESS);
*memoryInfop = (mach_memory_info_t *) copy;
*memoryInfoCntp = num_info;
}
return KERN_SUCCESS;
}
kern_return_t
mach_zone_info_for_zone(
host_priv_t host,
mach_zone_name_t name,
mach_zone_info_t *infop)
{
unsigned int max_zones, i;
zone_t zone_ptr;
if (host == HOST_NULL) {
return KERN_INVALID_HOST;
}
#if CONFIG_DEBUGGER_FOR_ZONE_INFO
if (!PE_i_can_has_debugger(NULL)) {
return KERN_INVALID_HOST;
}
#endif
if (infop == NULL) {
return KERN_INVALID_ARGUMENT;
}
simple_lock(&all_zones_lock, &zone_locks_grp);
max_zones = (unsigned int)(num_zones);
simple_unlock(&all_zones_lock);
zone_ptr = ZONE_NULL;
for (i = 0; i < max_zones; i++) {
zone_t z = &(zone_array[i]);
assert(z != ZONE_NULL);
if (track_this_zone(z->zone_name, name.mzn_name)) {
zone_ptr = z;
break;
}
}
if (zone_ptr == ZONE_NULL) {
return KERN_INVALID_ARGUMENT;
}
if (get_zone_info(zone_ptr, NULL, infop)) {
return KERN_SUCCESS;
}
return KERN_FAILURE;
}
kern_return_t
mach_zone_info_for_largest_zone(
host_priv_t host,
mach_zone_name_t *namep,
mach_zone_info_t *infop)
{
if (host == HOST_NULL) {
return KERN_INVALID_HOST;
}
#if CONFIG_DEBUGGER_FOR_ZONE_INFO
if (!PE_i_can_has_debugger(NULL)) {
return KERN_INVALID_HOST;
}
#endif
if (namep == NULL || infop == NULL) {
return KERN_INVALID_ARGUMENT;
}
if (get_zone_info(zone_find_largest(), namep, infop)) {
return KERN_SUCCESS;
}
return KERN_FAILURE;
}
uint64_t
get_zones_collectable_bytes(void)
{
unsigned int i, max_zones;
uint64_t zones_collectable_bytes = 0;
mach_zone_info_t zi;
simple_lock(&all_zones_lock, &zone_locks_grp);
max_zones = (unsigned int)(num_zones);
simple_unlock(&all_zones_lock);
for (i = 0; i < max_zones; i++) {
if (get_zone_info(&(zone_array[i]), NULL, &zi)) {
zones_collectable_bytes += GET_MZI_COLLECTABLE_BYTES(zi.mzi_collectable);
}
}
return zones_collectable_bytes;
}
kern_return_t
mach_zone_get_zlog_zones(
host_priv_t host,
mach_zone_name_array_t *namesp,
mach_msg_type_number_t *namesCntp)
{
#if DEBUG || DEVELOPMENT
unsigned int max_zones, logged_zones, i;
kern_return_t kr;
zone_t zone_ptr;
mach_zone_name_t *names;
vm_offset_t names_addr;
vm_size_t names_size;
if (host == HOST_NULL) {
return KERN_INVALID_HOST;
}
if (namesp == NULL || namesCntp == NULL) {
return KERN_INVALID_ARGUMENT;
}
simple_lock(&all_zones_lock, &zone_locks_grp);
max_zones = (unsigned int)(num_zones);
simple_unlock(&all_zones_lock);
names_size = round_page(max_zones * sizeof *names);
kr = kmem_alloc_pageable(ipc_kernel_map,
&names_addr, names_size, VM_KERN_MEMORY_IPC);
if (kr != KERN_SUCCESS) {
return kr;
}
names = (mach_zone_name_t *) names_addr;
zone_ptr = ZONE_NULL;
logged_zones = 0;
for (i = 0; i < max_zones; i++) {
zone_t z = &(zone_array[i]);
assert(z != ZONE_NULL);
if (z->zlog_btlog) {
get_zone_info(z, &names[logged_zones], NULL);
logged_zones++;
}
}
*namesp = (mach_zone_name_t *) create_vm_map_copy(names_addr, names_size, logged_zones * sizeof *names);
*namesCntp = logged_zones;
return KERN_SUCCESS;
#else
#pragma unused(host, namesp, namesCntp)
return KERN_FAILURE;
#endif
}
kern_return_t
mach_zone_get_btlog_records(
host_priv_t host,
mach_zone_name_t name,
zone_btrecord_array_t *recsp,
mach_msg_type_number_t *recsCntp)
{
#if DEBUG || DEVELOPMENT
unsigned int max_zones, i, numrecs = 0;
zone_btrecord_t *recs;
kern_return_t kr;
zone_t zone_ptr;
vm_offset_t recs_addr;
vm_size_t recs_size;
if (host == HOST_NULL) {
return KERN_INVALID_HOST;
}
if (recsp == NULL || recsCntp == NULL) {
return KERN_INVALID_ARGUMENT;
}
simple_lock(&all_zones_lock, &zone_locks_grp);
max_zones = (unsigned int)(num_zones);
simple_unlock(&all_zones_lock);
zone_ptr = ZONE_NULL;
for (i = 0; i < max_zones; i++) {
zone_t z = &(zone_array[i]);
assert(z != ZONE_NULL);
if (track_this_zone(z->zone_name, name.mzn_name)) {
zone_ptr = z;
break;
}
}
if (zone_ptr == ZONE_NULL) {
return KERN_INVALID_ARGUMENT;
}
if (!DO_LOGGING(zone_ptr)) {
return KERN_FAILURE;
}
numrecs = (unsigned int)(get_btlog_records_count(zone_ptr->zlog_btlog));
recs_size = round_page(numrecs * sizeof *recs);
kr = kmem_alloc_pageable(ipc_kernel_map, &recs_addr, recs_size, VM_KERN_MEMORY_IPC);
if (kr != KERN_SUCCESS) {
return kr;
}
kr = vm_map_wire_kernel(ipc_kernel_map, recs_addr, recs_addr + recs_size,
VM_PROT_READ | VM_PROT_WRITE, VM_KERN_MEMORY_IPC, FALSE);
assert(kr == KERN_SUCCESS);
recs = (zone_btrecord_t *)recs_addr;
get_btlog_records(zone_ptr->zlog_btlog, recs, &numrecs);
kr = vm_map_unwire(ipc_kernel_map, recs_addr, recs_addr + recs_size, FALSE);
assert(kr == KERN_SUCCESS);
*recsp = (zone_btrecord_t *) create_vm_map_copy(recs_addr, recs_size, numrecs * sizeof *recs);
*recsCntp = numrecs;
return KERN_SUCCESS;
#else
#pragma unused(host, name, recsp, recsCntp)
return KERN_FAILURE;
#endif
}
#if DEBUG || DEVELOPMENT
kern_return_t
mach_memory_info_check(void)
{
mach_memory_info_t * memory_info;
mach_memory_info_t * info;
zone_t zone;
unsigned int idx, num_info, max_zones;
vm_offset_t memory_info_addr;
kern_return_t kr;
size_t memory_info_size, memory_info_vmsize;
uint64_t top_wired, zonestotal, total;
num_info = vm_page_diagnose_estimate();
memory_info_size = num_info * sizeof(*memory_info);
memory_info_vmsize = round_page(memory_info_size);
kr = kmem_alloc(kernel_map, &memory_info_addr, memory_info_vmsize, VM_KERN_MEMORY_DIAG);
assert(kr == KERN_SUCCESS);
memory_info = (mach_memory_info_t *) memory_info_addr;
vm_page_diagnose(memory_info, num_info, 0);
simple_lock(&all_zones_lock, &zone_locks_grp);
max_zones = num_zones;
simple_unlock(&all_zones_lock);
top_wired = total = zonestotal = 0;
for (idx = 0; idx < max_zones; idx++) {
zone = &(zone_array[idx]);
assert(zone != ZONE_NULL);
lock_zone(zone);
zonestotal += ptoa_64(zone->page_count);
unlock_zone(zone);
}
for (idx = 0; idx < num_info; idx++) {
info = &memory_info[idx];
if (!info->size) {
continue;
}
if (VM_KERN_COUNT_WIRED == info->site) {
top_wired = info->size;
}
if (VM_KERN_SITE_HIDE & info->flags) {
continue;
}
if (!(VM_KERN_SITE_WIRED & info->flags)) {
continue;
}
total += info->size;
}
total += zonestotal;
printf("vm_page_diagnose_check %qd of %qd, zones %qd, short 0x%qx\n", total, top_wired, zonestotal, top_wired - total);
kmem_free(kernel_map, memory_info_addr, memory_info_vmsize);
return kr;
}
extern boolean_t(*volatile consider_buffer_cache_collect)(int);
#endif
kern_return_t
mach_zone_force_gc(
host_t host)
{
if (host == HOST_NULL) {
return KERN_INVALID_HOST;
}
#if DEBUG || DEVELOPMENT
if (consider_buffer_cache_collect != NULL) {
(void)(*consider_buffer_cache_collect)(0);
}
consider_zone_gc(FALSE);
#endif
return KERN_SUCCESS;
}
extern unsigned int stack_total;
extern unsigned long long stack_allocs;
zone_t
zone_find_largest(void)
{
unsigned int i;
unsigned int max_zones;
zone_t the_zone;
zone_t zone_largest;
simple_lock(&all_zones_lock, &zone_locks_grp);
max_zones = num_zones;
simple_unlock(&all_zones_lock);
zone_largest = &(zone_array[0]);
for (i = 0; i < max_zones; i++) {
the_zone = &(zone_array[i]);
if (the_zone->cur_size > zone_largest->cur_size) {
zone_largest = the_zone;
}
}
return zone_largest;
}
#if ZONE_DEBUG
#define zone_in_use(z) ( z->count || z->free_elements \
|| !queue_empty(&z->pages.all_free) \
|| !queue_empty(&z->pages.intermediate) \
|| (z->allows_foreign && !queue_empty(&z->pages.any_free_foreign)))
#endif
#if DEBUG || DEVELOPMENT
static uintptr_t *
zone_copy_all_allocations_inqueue(zone_t z, queue_head_t * queue, uintptr_t * elems)
{
struct zone_page_metadata *page_meta;
vm_offset_t free, elements;
vm_offset_t idx, numElements, freeCount, bytesAvail, metaSize;
queue_iterate(queue, page_meta, struct zone_page_metadata *, pages)
{
elements = get_zone_page(page_meta);
bytesAvail = ptoa(page_meta->page_count);
freeCount = 0;
if (z->allows_foreign && !from_zone_map(elements, z->elem_size)) {
metaSize = (sizeof(struct zone_page_metadata) + ZONE_ELEMENT_ALIGNMENT - 1) & ~(ZONE_ELEMENT_ALIGNMENT - 1);
bytesAvail -= metaSize;
elements += metaSize;
}
numElements = bytesAvail / z->elem_size;
for (idx = 0; idx < numElements; idx++) {
elems[idx] = INSTANCE_PUT(elements + idx * z->elem_size);
}
free = (vm_offset_t)page_metadata_get_freelist(page_meta);
while (free) {
for (idx = 0; (idx < numElements) && (elems[idx] != INSTANCE_PUT(free)); idx++) {
}
assert(idx < numElements);
bcopy(&elems[idx + 1], &elems[idx], (numElements - (idx + 1)) * sizeof(elems[0]));
numElements--;
freeCount++;
vm_offset_t *primary = (vm_offset_t *) free;
free = *primary ^ zp_nopoison_cookie;
}
elems += numElements;
}
return elems;
}
kern_return_t
zone_leaks(const char * zoneName, uint32_t nameLen, leak_site_proc proc, void * refCon)
{
uintptr_t zbt[MAX_ZTRACE_DEPTH];
zone_t zone;
uintptr_t * array;
uintptr_t * next;
uintptr_t element, bt;
uint32_t idx, count, found;
uint32_t btidx, btcount, nobtcount, btfound;
uint32_t elemSize;
uint64_t maxElems;
unsigned int max_zones;
kern_return_t kr;
simple_lock(&all_zones_lock, &zone_locks_grp);
max_zones = num_zones;
simple_unlock(&all_zones_lock);
for (idx = 0; idx < max_zones; idx++) {
if (!strncmp(zoneName, zone_array[idx].zone_name, nameLen)) {
break;
}
}
if (idx >= max_zones) {
return KERN_INVALID_NAME;
}
zone = &zone_array[idx];
elemSize = (uint32_t) zone->elem_size;
maxElems = ptoa(zone->page_count) / elemSize;
if ((zone->alloc_size % elemSize)
&& !leak_scan_debug_flag) {
return KERN_INVALID_CAPABILITY;
}
kr = kmem_alloc_kobject(kernel_map, (vm_offset_t *) &array,
maxElems * sizeof(uintptr_t), VM_KERN_MEMORY_DIAG);
if (KERN_SUCCESS != kr) {
return kr;
}
lock_zone(zone);
next = array;
next = zone_copy_all_allocations_inqueue(zone, &zone->pages.any_free_foreign, next);
next = zone_copy_all_allocations_inqueue(zone, &zone->pages.intermediate, next);
next = zone_copy_all_allocations_inqueue(zone, &zone->pages.all_used, next);
count = (uint32_t)(next - array);
unlock_zone(zone);
zone_leaks_scan(array, count, (uint32_t)zone->elem_size, &found);
assert(found <= count);
for (idx = 0; idx < count; idx++) {
element = array[idx];
if (kInstanceFlagReferenced & element) {
continue;
}
element = INSTANCE_PUT(element) & ~kInstanceFlags;
}
if (zone->zlog_btlog && !corruption_debug_flag) {
btlog_copy_backtraces_for_elements(zone->zlog_btlog, array, &count, elemSize, proc, refCon);
}
for (nobtcount = idx = 0; idx < count; idx++) {
element = array[idx];
if (!element) {
continue;
}
if (kInstanceFlagReferenced & element) {
continue;
}
element = INSTANCE_PUT(element) & ~kInstanceFlags;
btcount = (typeof(btcount))(zone->elem_size / sizeof(uintptr_t));
if (btcount >= MAX_ZTRACE_DEPTH) {
btcount = MAX_ZTRACE_DEPTH - 1;
}
for (btfound = btidx = 0; btidx < btcount; btidx++) {
bt = ((uintptr_t *)element)[btcount - 1 - btidx];
if (!VM_KERNEL_IS_SLID(bt)) {
break;
}
zbt[btfound++] = bt;
}
if (btfound) {
(*proc)(refCon, 1, elemSize, &zbt[0], btfound);
} else {
nobtcount++;
}
}
if (nobtcount) {
zbt[0] = (uintptr_t) &zalloc;
(*proc)(refCon, nobtcount, elemSize, &zbt[0], 1);
}
kmem_free(kernel_map, (vm_offset_t) array, maxElems * sizeof(uintptr_t));
return KERN_SUCCESS;
}
boolean_t
kdp_is_in_zone(void *addr, const char *zone_name)
{
zone_t z;
return zone_element_size(addr, &z) && !strcmp(z->zone_name, zone_name);
}
boolean_t
run_zone_test(void)
{
unsigned int i = 0, max_iter = 5;
void * test_ptr;
zone_t test_zone;
simple_lock(&zone_test_lock, &zone_locks_grp);
if (!zone_test_running) {
zone_test_running = TRUE;
} else {
simple_unlock(&zone_test_lock);
printf("run_zone_test: Test already running.\n");
return FALSE;
}
simple_unlock(&zone_test_lock);
printf("run_zone_test: Testing zinit(), zalloc(), zfree() and zdestroy() on zone \"test_zone_sysctl\"\n");
do {
test_zone = zinit(sizeof(uint64_t), 100 * sizeof(uint64_t), sizeof(uint64_t), "test_zone_sysctl");
if (test_zone == NULL) {
printf("run_zone_test: zinit() failed\n");
return FALSE;
}
#if KASAN_ZALLOC
if (test_zone_ptr == NULL && zone_free_count(test_zone) != 0) {
#else
if (zone_free_count(test_zone) != 0) {
#endif
printf("run_zone_test: free count is not zero\n");
return FALSE;
}
if (test_zone_ptr == NULL) {
printf("run_zone_test: zone created for the first time\n");
test_zone_ptr = test_zone;
} else if (test_zone != test_zone_ptr) {
printf("run_zone_test: old zone pointer and new zone pointer don't match\n");
return FALSE;
}
test_ptr = zalloc(test_zone);
if (test_ptr == NULL) {
printf("run_zone_test: zalloc() failed\n");
return FALSE;
}
zfree(test_zone, test_ptr);
zdestroy(test_zone);
i++;
printf("run_zone_test: Iteration %d successful\n", i);
} while (i < max_iter);
printf("run_zone_test: Test passed\n");
simple_lock(&zone_test_lock, &zone_locks_grp);
zone_test_running = FALSE;
simple_unlock(&zone_test_lock);
return TRUE;
}
#endif