1 files changed, 75 insertions, 0 deletions
diff --git a/subhook_macos.c b/subhook_macos.c
new file mode 100644
index 0000000..866edf5
--- /dev/null
+++ b/subhook_macos.c
@@ -0,0 +1,75 @@
+/*
+ * Copyright (c) 2012-2018 Zeex
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stddef.h>
+#include <unistd.h>
+#include <sys/mman.h>
+#include <mach/mach.h>
+
+#define SUBHOOK_CODE_PROTECT_FLAGS (PROT_READ | PROT_WRITE | PROT_EXEC)
+
+int subhook_unprotect(void *address, size_t size) {
+  long pagesize;
+
+  pagesize = sysconf(_SC_PAGESIZE);
+  address = (void *)((long)address & ~(pagesize - 1));
+	int error = mprotect(address, size, SUBHOOK_CODE_PROTECT_FLAGS);
+
+  if (-1 == error)
+    {
+        // If mprotect fails, try to use VM_PROT_COPY with vm_protect        
+        kern_return_t kret = vm_protect(mach_task_self(), (unsigned long)address, size, 0, SUBHOOK_CODE_PROTECT_FLAGS | VM_PROT_COPY);				
+        if (kret != KERN_SUCCESS)
+        {
+            error = -1;	
+        }
+        error = 0;
+    }				
+
+  return error;
+}
+
+void *subhook_alloc_code(size_t size) {
+  void *address;
+
+  address = mmap(NULL,
+                 size,
+                 SUBHOOK_CODE_PROTECT_FLAGS,
+                 #if defined MAP_32BIT && !defined __APPLE__
+                   MAP_32BIT |
+                 #endif
+                 MAP_PRIVATE | MAP_ANONYMOUS,
+                 -1,
+                 0);
+  return address == MAP_FAILED ? NULL : address;
+}
+
+int subhook_free_code(void *address, size_t size) {
+  if (address == NULL) {
+    return 0;
+  }
+  return munmap(address, size);
+}