D60025.diff
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	diff --git a/sys/kern/subr_uio.c b/sys/kern/subr_uio.c
	--- a/sys/kern/subr_uio.c
	+++ b/sys/kern/subr_uio.c
	@@ -468,6 +468,24 @@
	return (0);
	}

	+/*
	+ * Update the lengths of a userspace iovec to match those in a struct uio's
	+ * iovec (previously created by copyinuio).
	+ */
	+int
	+updateiov(const struct uio uiop, void uiovp)
	+{
	+ int i, error;
	+ struct iovec *iovp = uiovp;
	+
	+ for (i = 0; i < uiop->uio_iovcnt; i++) {
	+ error = suword(&iovp[i].iov_len, uiop->uio_iov[i].iov_len);
	+ if (error != 0)
	+ return (EFAULT);
	+ }
	+ return (0);
	+}
	+
	struct uio *
	allocuio(u_int iovcnt)
	{
	diff --git a/sys/sys/uio.h b/sys/sys/uio.h
	--- a/sys/sys/uio.h
	+++ b/sys/sys/uio.h
	@@ -99,6 +99,7 @@
	int uiomove_nofault(void cp, int n, struct uio uio);
	int uiomove_object(struct vm_object obj, off_t obj_size, struct uio uio);
	int uiomove_step(void cp, void base, size_t cnt, struct uio *uio);
	+int updateiov(const struct uio uiop, void iovp);

	#else /* !_KERNEL */