From bed746d7d61af2026b41a90f16055e55c3634c26 Mon Sep 17 00:00:00 2001
From: David Carlier <devnexen@gmail.com>
Date: Mon, 1 Jul 2019 06:56:16 +0000
Subject: [PATCH] Using BSD new PROT_MAX mmap to block page address wider
 promotions

---
 src/os.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/os.c b/src/os.c
index 1fa6319..f6ca2ae 100644
--- a/src/os.c
+++ b/src/os.c
@@ -105,7 +105,11 @@ static void* mi_mmap(void* addr, size_t size, int extra_flags, mi_stats_t* stats
       flags |= MAP_FIXED;
     #endif
   }
-  p = mmap(addr, size, (PROT_READ | PROT_WRITE), flags, -1, 0);
+  int pflags = PROT_READ | PROT_WRITE;
+#if defined(PROT_MAX)
+  pflags |= PROT_MAX(PROT_READ | PROT_WRITE); // BSD
+#endif
+  p = mmap(addr, size, pflags, flags, -1, 0);
   if (p == MAP_FAILED) p = NULL;
   if (addr != NULL && p != addr) {
     mi_munmap(p, size);