D27017.id78938.diff
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	Index: sys/compat/linux/linux_mmap.c
	===================================================================
	--- sys/compat/linux/linux_mmap.c
	+++ sys/compat/linux/linux_mmap.c
	@@ -396,6 +396,15 @@
	return (EINVAL);
	default:
	linux_msg(curthread, "unsupported madvise behav %d", behav);
	+ /* FALLTHROUGH */
	+ case -1:
	+ /*
	+ * -1 is used as a dummy value to detect simplistic madvise(2)
	+ * stub implementations. This safeguard is used by libraries
	+ * like OpenSSL and BoringSSL before assuming MADV_WIPEONFORK
	+ * is safe to use. Don't produce an error message for this
	+ * special dummy value; just return EINVAL.
	+ */
	return (EINVAL);
	}
	}