vendor: update buildkit to master@ae9d0f5

Signed-off-by: Justin Chadwell <me@jedevc.com>

vendor/golang.org/x/sys/unix/sockcmsg_unix.go

@@ -52,6 +52,20 @@ func ParseSocketControlMessage(b []byte) ([]SocketControlMessage, error) {
 	return msgs, nil
 }
 
+// ParseOneSocketControlMessage parses a single socket control message from b, returning the message header,
+// message data (a slice of b), and the remainder of b after that single message.
+// When there are no remaining messages, len(remainder) == 0.
+func ParseOneSocketControlMessage(b []byte) (hdr Cmsghdr, data []byte, remainder []byte, err error) {
+	h, dbuf, err := socketControlMessageHeaderAndData(b)
+	if err != nil {
+		return Cmsghdr{}, nil, nil, err
+	}
+	if i := cmsgAlignOf(int(h.Len)); i < len(b) {
+		remainder = b[i:]
+	}
+	return *h, dbuf, remainder, nil
+}
+
 func socketControlMessageHeaderAndData(b []byte) (*Cmsghdr, []byte, error) {
 	h := (*Cmsghdr)(unsafe.Pointer(&b[0]))
 	if h.Len < SizeofCmsghdr || uint64(h.Len) > uint64(len(b)) {

vendor/golang.org/x/sys/unix/syscall_linux.go

@@ -1554,6 +1554,7 @@ func sendmsgN(fd int, iov []Iovec, oob []byte, ptr unsafe.Pointer, salen _Sockle
 				var iova [1]Iovec
 				iova[0].Base = &dummy
 				iova[0].SetLen(1)
+				iov = iova[:]
 			}
 		}
 		msg.Control = &oob[0]