--- /dev/null
+++ libmalloc/libmalloc-792.41.1/tests/posix_memalign_test.c
@@ -0,0 +1,224 @@
+//
+//  posix_memalign_test.c
+//  libmalloc
+//
+//  test allocating and freeing all sizes and alignments
+//
+
+#include <darwintest.h>
+#include <errno.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "../src/platform.h"
+
+#if !MALLOC_TARGET_EXCLAVES
+#include <mach/mach.h>
+#endif // !MALLOC_TARGET_EXCLAVES
+
+#include <malloc/malloc.h>
+#include <malloc_private.h>
+
+
+union memtag_ptr {
+	uint64_t value;
+
+	struct {
+		uint64_t ptr_bits : 56;
+		uint64_t ptr_tag : 4;
+		uint64_t ptr_upper : 4;
+	};
+};
+
+static uint8_t *
+memtag_strip_address(uint8_t *tagged_addr)
+{
+	union memtag_ptr p = {
+			.value = (uint64_t)tagged_addr,
+	};
+	return (uint8_t *)p.ptr_bits;
+}
+
+T_GLOBAL_META(T_META_RUN_CONCURRENTLY(true));
+
+#if !MALLOC_TARGET_EXCLAVES
+struct t_recorder_ctx {
+	void *ptr;
+	size_t size;
+	bool found;
+};
+
+static void
+pointer_recorder(task_t task, void *context, unsigned type, vm_range_t *ranges,
+		unsigned count)
+{
+	if (!(type & MALLOC_PTR_IN_USE_RANGE_TYPE)) {
+		return;
+	}
+
+	struct t_recorder_ctx *ctx = context;
+	vm_address_t ptr_addr = (vm_address_t)(ctx->ptr);
+	vm_size_t ptr_size = (vm_size_t)(ctx->size);
+	for (unsigned i = 0; i < count; i++) {
+		vm_range_t *range = &ranges[i];
+		if (range->address <= ptr_addr &&
+				range->address + range->size > ptr_addr) {
+			T_QUIET; T_EXPECT_FALSE(ctx->found, "first time");
+
+			vm_size_t offset = ptr_addr - range->address;
+			T_QUIET; T_EXPECT_GE(range->size - offset, ctx->size,
+					"allocation must be large enough");
+
+			ctx->found = true;
+		}
+	}
+}
+
+static void
+check_pointer_is_enumerated(void *ptr, size_t size)
+{
+	// Under MTE, `ptr` is tagged, but the enumerator reports canonical addresses.
+	ptr = memtag_strip_address(ptr);
+
+	vm_address_t *zones;
+	unsigned zone_count;
+	kern_return_t kr;
+
+	kr = malloc_get_all_zones(mach_task_self(), /*reader=*/NULL, &zones,
+			&zone_count);
+	T_QUIET; T_ASSERT_EQ(kr, KERN_SUCCESS,
+			"malloc_get_all_zones(mach_task_self(), ...)");
+
+	struct t_recorder_ctx ctx = {
+		.ptr = ptr,
+		.size = size,
+		.found = false,
+	};
+
+	for (unsigned i = 0; i < zone_count; i++) {
+		malloc_zone_t *zone = (malloc_zone_t *)zones[i];
+		zone->introspect->enumerator(mach_task_self(), &ctx,
+				MALLOC_PTR_IN_USE_RANGE_TYPE, (vm_address_t)zone, NULL,
+				pointer_recorder);
+		if (ctx.found) {
+			return;
+		}
+	}
+	T_QUIET; T_FAIL("pointer %p not enumerated in any zone", ptr);
+}
+#endif // !MALLOC_TARGET_EXCLAVES
+
+static inline void *
+t_posix_memalign(size_t alignment, size_t size, bool scribble, bool enumerate)
+{
+	void *ptr = NULL;
+	int result = posix_memalign(&ptr, alignment, size);
+	size_t allocated_size = malloc_size(ptr);
+
+	T_QUIET; T_ASSERT_NOTNULL(ptr, "allocation");
+	T_QUIET; T_ASSERT_EQ((intptr_t)ptr % alignment, 0ul, "pointer should be properly aligned");
+	T_QUIET; T_EXPECT_LE(size, allocated_size, "allocation size");
+
+	T_QUIET; T_EXPECT_TRUE(malloc_claimed_address(ptr), "should be claimed");
+#if !MALLOC_TARGET_EXCLAVES
+	if (enumerate) {
+		check_pointer_is_enumerated(ptr, size);
+	}
+#endif // !MALLOC_TARGET_EXCLAVES
+
+	if (scribble) {
+		// Scribble memory pointed to by `ptr` to make sure we're not using that
+		// memory for control structures. This also makes sure the memory can be
+		// written to.
+		const uint64_t pat = 0xdeadbeefcafebabeull;
+		memset_pattern8(ptr, &pat, size);
+	}
+	return ptr;
+}
+
+T_DECL(posix_memalign_free, "posix_memalign all power of two alignments <= 4096",
+	   T_META_TAG_VM_PREFERRED, T_META_TAG_ALL_ALLOCATORS)
+{
+	for (size_t alignment = sizeof(void*); alignment < 4096; alignment *= 2) {
+		bool enumerate = true;
+		// test several sizes
+		for (size_t size = alignment; size <= 256*alignment; size += 8) {
+			void* ptr = t_posix_memalign(alignment, size, true, enumerate);
+			free(ptr);
+			enumerate = false;
+		}
+	}
+}
+
+T_DECL(posix_memalign_alignment_not_a_power_of_2,
+	   "posix_memalign should return EINVAL if alignment is not a power of 2",
+	   T_META_TAG_VM_PREFERRED, T_META_TAG_ALL_ALLOCATORS)
+{
+	{
+		void *ptr = NULL;
+		int result = posix_memalign(&ptr, 24, 48); // alignment is even, but not a power of two
+		T_QUIET; T_ASSERT_NULL(ptr, "ptr should be null");
+		T_QUIET; T_ASSERT_EQ(result, EINVAL, "posix_memalign should return EINVAL");
+	}
+
+	{
+		void *ptr = NULL;
+		int result = posix_memalign(&ptr, 23, 46); // alignment is odd, and not a power of two
+		T_QUIET; T_ASSERT_NULL(ptr, "ptr should be null");
+		T_QUIET; T_ASSERT_EQ(result, EINVAL, "posix_memalign should return EINVAL");
+	}
+}
+
+T_DECL(posix_memalign_alignment_not_a_multiple_of_voidstar,
+	   "posix_memalign should return EINVAL if alignment is not a multiple of sizeof(void*)",
+	   T_META_TAG_VM_PREFERRED, T_META_TAG_ALL_ALLOCATORS)
+{
+	void *ptr = NULL;
+	const size_t alignment = sizeof(void*)+1;
+	int result = posix_memalign(&ptr, alignment, alignment * 2);
+	T_QUIET; T_ASSERT_NULL(ptr, "ptr should be null");
+	T_QUIET; T_ASSERT_EQ(result, EINVAL, "posix_memalign should return EINVAL");
+}
+
+T_DECL(posix_memalign_allocate_size_0,
+       "posix_memalign should return something that can be passed to free() when size is 0",
+	   T_META_TAG_VM_PREFERRED, T_META_TAG_ALL_ALLOCATORS)
+{
+	void *ptr = NULL;
+	int result = posix_memalign(&ptr, 8, 0);
+	T_QUIET; T_ASSERT_EQ(result, 0, "posix_memalign should not return an error when asked for size 0");
+	free(ptr);
+}
+
+#if defined(__LP64__)
+T_DECL(posix_memalign_large, "posix_memalign large power of two alignments",
+		T_META_TAG_VM_NOT_PREFERRED, T_META_TAG_ALL_ALLOCATORS)
+{
+	// 64GB on macOS, 64MB on embedded
+	uint64_t max_alignment = TARGET_OS_OSX ? UINT64_C(68719476736) : UINT64_C(67108864);
+	for (size_t alignment = sizeof(void*); alignment <= max_alignment; alignment *= 2) {
+		// don't scribble - we don't want to actually touch that many pages, we just
+		// verify that the allocated pointer looks reasonable
+		void* ptr = t_posix_memalign(alignment, alignment, false, true);
+		free(ptr);
+	}
+	T_END;
+}
+#endif // __LP64__
+
+T_DECL(posix_memalign_single_page_large,
+		"Allocate tiny blocks with large alignment",
+		T_META_TAG_VM_PREFERRED, T_META_TAG_XZONE_ONLY)
+{
+	void *ptr1 = t_posix_memalign(32768, 1, false, true);
+	T_ASSERT_NOTNULL(ptr1, "Allocated aligned ptr %p", ptr1);
+	void *ptr2 = t_posix_memalign(16*1024, 48 * 1024, false, true);
+	T_ASSERT_NOTNULL(ptr2, "Allocated aligned ptr %p", ptr2);
+	void *ptr3 = t_posix_memalign(32768, 1, false, true);
+	T_ASSERT_NOTNULL(ptr3, "Allocated aligned ptr %p", ptr3);
+
+	free(ptr1);
+	free(ptr2);
+	free(ptr3);
+}