--- /dev/null
+++ libmalloc/libmalloc-792.1.1/src/malloc_common.c
@@ -0,0 +1,225 @@
+/*
+ * Copyright (c) 2018-2023 Apple Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+#include "internal.h"
+
+#pragma mark -
+#pragma mark Utility Functions
+
+// libplatform does not have strstr() and we don't want to add any new
+// dependencies on libc, so we have to implement a version of strstr()
+// here. Fortunately, as it's only used to look for boot arguments, it does not
+// have to be efficient. We can also assume that the source string is
+// nul-terminated. Eventually, we will move the function to a more central
+// location and use it to replace other uses of strstr().
+const char * __null_terminated
+malloc_common_strstr(const char * __null_terminated src, const char * __counted_by(target_len) target, size_t target_len)
+{
+#if !MALLOC_TARGET_EXCLAVES
+	const char *next = src;
+	while (*next) {
+		if (!strncmp(next, target, target_len)) {
+			return next;
+		}
+		next++;
+	}
+	return NULL;
+#else
+	return strstr(src, __unsafe_null_terminated_from_indexable(target, target + target_len));
+#endif // MALLOC_TARGET_EXCLAVES
+}
+
+// Converts a string to a long. If a non-numeric value is found, the
+// return value is whatever has been accumulated so far. end_ptr always points
+// to the character that caused the conversion to stop. We can't use strtol()
+// etc because that would add a new dependency on libc. Eventually, this
+// function could be made generally available within the library and used to
+// replace the existing calls to strtol(). Currenly only handles non-negative
+// numbers and does not detect overflow.
+long
+malloc_common_convert_to_long(const char * __null_terminated ptr, const char * __null_terminated *end_ptr)
+{
+#if !MALLOC_TARGET_EXCLAVES
+	long value = 0;
+	while (*ptr) {
+		char c = *ptr;
+		if (c < '0' || c > '9') {
+			break;
+		}
+		value = value * 10 + (c - '0');
+		ptr++;
+	}
+	*end_ptr = ptr;
+	return value;
+#else
+	return strtol(ptr, (char * __null_terminated *)end_ptr, 10);
+#endif // MALLOC_TARGET_EXCLAVES
+}
+
+// Looks for a sequence of the form "key=value" in the string 'src' and
+// returns the location of the first character of 'value', or NULL if not
+// found. No spaces are permitted around the "=".
+const char * __null_terminated
+malloc_common_value_for_key(const char * __null_terminated src, const char * __null_terminated key)
+{
+	const char * __null_terminated ptr = src;
+	size_t keylen = strlen(key);
+	while ((ptr = malloc_common_strstr(ptr, __unsafe_forge_bidi_indexable(const char *, key, keylen), keylen)) != NULL) {
+		// Workaround for indexable pointers being incrementable by one only
+		for (size_t i = 0; i < keylen; ++i) {
+			++ptr;
+		}
+		if (*ptr == '=') {
+			return ptr + 1;
+		}
+	}
+	return NULL;
+}
+
+// Looks for a sequence of the form "key=value" in the string 'src' and
+// returns the location of the first character of 'value'. No spaces are
+// permitted around the "=". The value is copied to 'bufp', up to the first
+// whitespace or nul character and bounded by maxlen, and nul-terminated.
+// Returns bufp if the key was found, NULL if not.
+const char * __null_terminated
+malloc_common_value_for_key_copy(const char * __null_terminated src, const char * __null_terminated key,
+							   char * __counted_by(maxlen) bufp, size_t maxlen)
+{
+	const char * __null_terminated ptr = malloc_common_value_for_key(src, key);
+	if (ptr) {
+		size_t to_len = maxlen;
+		char * __counted_by(to_len) to = bufp;
+		while (to_len > 1) { // Always leave room for a '\0'
+			char c = *ptr++;
+			if (c == '\0' || c == ' ' || c == '\t' || c == '\n') {
+				break;
+			}
+			*to = c;
+			++to;
+			to_len--;
+		}
+		*to = '\0';	// Always nul-terminate
+		return __unsafe_null_terminated_from_indexable(bufp, to);
+	}
+	return NULL;
+}
+
+unsigned
+malloc_zone_batch_malloc_fallback(malloc_zone_t *zone, size_t size,
+		void * __unsafe_indexable * __counted_by(num_requested)  results, unsigned num_requested)
+{
+	unsigned allocated;
+	for (allocated = 0; allocated < num_requested; allocated++) {
+		void *ptr = zone->malloc(zone, size);
+		if (!ptr) {
+			break;
+		}
+
+		results[allocated] = ptr;
+	}
+
+	return allocated;
+}
+
+void
+malloc_zone_batch_free_fallback(malloc_zone_t *zone,
+		void * __unsafe_indexable * __counted_by(count) to_be_freed,
+		unsigned count)
+{
+	for (unsigned i = 1; i <= count; i++) {
+		// Note: we iterate backward because nano and magazine malloc both do,
+		// although that seems likely to just be a vestigial codegen
+		// optimization for ancient non-optimizing compilers
+		void * __unsafe_indexable ptr = to_be_freed[count - i];
+		if (ptr) {
+			zone->free(zone, ptr);
+		}
+	}
+}
+
+size_t
+malloc_zone_pressure_relief_fallback(malloc_zone_t *zone, size_t goal)
+{
+	return 0;
+}
+
+MALLOC_NOEXPORT MALLOC_NOINLINE
+void
+___BUG_IN_CLIENT_OF_LIBMALLOC_POINTER_BEING_FREED_WAS_NOT_ALLOCATED(
+		int flags, void *__unsafe_indexable ptr)
+{
+
+	malloc_report(flags, "*** error for object %p: "
+		"pointer being freed was not allocated\n", ptr);
+}
+
+#if !MALLOC_TARGET_EXCLAVES && !MALLOC_TARGET_EXCLAVES_INTROSPECTOR
+
+#if CONFIG_CHECK_PLATFORM_BINARY
+// Avoid conditioning on this if at all possible
+bool malloc_is_platform_binary = true;
+#endif // CONFIG_CHECK_PLATFORM_BINARY
+
+// Use malloc_is_platform_binary instead
+bool
+_malloc_is_platform_binary(void)
+{
+	uint32_t flags = 0;
+	int err = csops(getpid(), CS_OPS_STATUS, &flags, sizeof(flags));
+	if (err) {
+		return false;
+	}
+	return (flags & CS_PLATFORM_BINARY);
+}
+
+bool malloc_internal_security_policy = false;
+
+bool
+_malloc_allow_internal_security_policy(const char *envp[])
+{
+#if !TARGET_OS_SIMULATOR && defined(_COMM_PAGE_DEV_FIRM)
+	if (!*((uint32_t *)_COMM_PAGE_DEV_FIRM)) {
+		return false;
+	}
+#endif
+
+#if CONFIG_FEATUREFLAGS_SIMPLE
+	if (os_feature_enabled_simple(libmalloc, AllowInternalSecurityPolicy,
+			false)) {
+		return true;
+	}
+#endif
+
+	const char *flag = _simple_getenv(envp, "MallocAllowInternalSecurity");
+	if (flag) {
+		const char *endp;
+		long value = malloc_common_convert_to_long(flag, &endp);
+		if (!*endp && endp != flag && (value == 0 || value == 1)) {
+			return (bool)value;
+		}
+	}
+
+	return false;
+}
+
+#endif // !MALLOC_TARGET_EXCLAVES && !MALLOC_TARGET_EXCLAVES_INTROSPECTOR