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.
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@ -257,8 +257,10 @@ void *PosixLockedPageAllocator::AllocateLocked(size_t len, bool *lockingSuccess)
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}
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if (addr) {
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*lockingSuccess = mlock(addr, len) == 0;
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#ifdef MADV_DONTDUMP
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#if defined(MADV_DONTDUMP) // Linux
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madvise(addr, len, MADV_DONTDUMP);
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#elif defined(MADV_NOCORE) // FreeBSD
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madvise(addr, len, MADV_NOCORE);
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#endif
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}
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return addr;
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