From 09f86e7494690c4b4018ddbb2b4d48dc9b8a57c2 Mon Sep 17 00:00:00 2001
From: Vasil Dimov <vd@FreeBSD.org>
Date: Thu, 26 Mar 2020 20:43:17 +0100
Subject: [PATCH] lockedpool: avoid sensitive data in core files (FreeBSD)

This is a followup to
23991ee53 / https://github.com/bitcoin/bitcoin/pull/15600
to also use madvise(2) on FreeBSD to avoid sensitive data allocated
with secure_allocator ending up in core files in addition to preventing
it from going to the swap.
---
 src/support/lockedpool.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/support/lockedpool.cpp b/src/support/lockedpool.cpp
index 7fb05156e..b7b2380ca 100644
--- a/src/support/lockedpool.cpp
+++ b/src/support/lockedpool.cpp
@@ -230,8 +230,10 @@ void *PosixLockedPageAllocator::AllocateLocked(size_t len, bool *lockingSuccess)
     addr = mmap(nullptr, len, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
     if (addr) {
         *lockingSuccess = mlock(addr, len) == 0;
-#ifdef MADV_DONTDUMP
+#if defined(MADV_DONTDUMP) // Linux
         madvise(addr, len, MADV_DONTDUMP);
+#elif defined(MADV_NOCORE) // FreeBSD
+        madvise(addr, len, MADV_NOCORE);
 #endif
     }
     return addr;