D27017.id78983.diff
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D27017.id78983.diff
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	Index: head/sys/compat/linux/linux_mmap.c
	===================================================================
	--- head/sys/compat/linux/linux_mmap.c
	+++ head/sys/compat/linux/linux_mmap.c
	@@ -394,6 +394,16 @@
	case LINUX_MADV_SOFT_OFFLINE:
	linux_msg(curthread, "unsupported madvise MADV_SOFT_OFFLINE");
	return (EINVAL);
	+ case -1:
	+ /*
	+ * -1 is sometimes used as a dummy value to detect simplistic
	+ * madvise(2) stub implementations. This safeguard is used by
	+ * BoringSSL, for example, before assuming MADV_WIPEONFORK is
	+ * safe to use. Don't produce an "unsupported" error message
	+ * for this special dummy value, which is unlikely to be used
	+ * by any new advisory behavior feature.
	+ */
	+ return (EINVAL);
	default:
	linux_msg(curthread, "unsupported madvise behav %d", behav);
	return (EINVAL);