--- /dev/null
+++ libmalloc/libmalloc-409.40.6/src/has_section.c
@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2020 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 "base.h"
+#include "platform.h"
+
+#include <stdbool.h>
+
+#if MALLOC_TARGET_64BIT
+
+#include <mach-o/dyld.h>
+#include <mach-o/getsect.h>
+#include <string.h>
+
+// Copied from libmacho/getsecbyname.c, because we do not want to add a
+// dependency on cctools/libmacho (-lmacho).  Only sync with original, never
+// modify independently.
+// Version, git hash/tag: cctools-987
+static
+// *** DO NOT MODIFY - START ***
+/*
+ * This routine returns the section structure for the named section in the
+ * named segment for the mach_header_64 pointer passed to it if it exist.
+ * Otherwise it returns zero.
+ */
+const struct section_64 *
+my_getsectbynamefromheader_64(
+struct mach_header_64 *mhp,
+const char *segname,
+const char *sectname)
+{
+	struct segment_command_64 *sgp;
+	struct section_64 *sp;
+	uint32_t i, j;
+        
+	sgp = (struct segment_command_64 *)
+	      ((char *)mhp + sizeof(struct mach_header_64));
+	for(i = 0; i < mhp->ncmds; i++){
+	    if(sgp->cmd == LC_SEGMENT_64)
+		if(strncmp(sgp->segname, segname, sizeof(sgp->segname)) == 0 ||
+		   mhp->filetype == MH_OBJECT){
+		    sp = (struct section_64 *)((char *)sgp +
+			 sizeof(struct segment_command_64));
+		    for(j = 0; j < sgp->nsects; j++){
+			if(strncmp(sp->sectname, sectname,
+			   sizeof(sp->sectname)) == 0 &&
+			   strncmp(sp->segname, segname,
+			   sizeof(sp->segname)) == 0)
+			    return(sp);
+			sp = (struct section_64 *)((char *)sp +
+			     sizeof(struct section_64));
+		    }
+		}
+	    sgp = (struct segment_command_64 *)((char *)sgp + sgp->cmdsize);
+	}
+	return((struct section_64 *)0);
+}
+// *** DO NOT MODIFY - END ***
+#endif  // MALLOC_TARGET_64BIT
+
+MALLOC_NOEXPORT
+bool
+main_image_has_section(const char* segname, const char *sectname)
+{
+#if MALLOC_TARGET_64BIT
+	const struct mach_header* mh = _dyld_get_image_header(0);
+	return my_getsectbynamefromheader_64((struct mach_header_64 *)mh, segname, sectname) != NULL;
+#else
+	return false;
+#endif
+}