VOL-2265 test go.mod and vendor consistency;
Update dependencies to resolve `410 Gone` errors when fetching modules
Change-Id: If0bdbc1b6d629ce819b9fa4701c016df812f92d5
diff --git a/vendor/golang.org/x/net/http2/server.go b/vendor/golang.org/x/net/http2/server.go
index d4abeb2..6f8e8b0 100644
--- a/vendor/golang.org/x/net/http2/server.go
+++ b/vendor/golang.org/x/net/http2/server.go
@@ -52,10 +52,11 @@
)
const (
- prefaceTimeout = 10 * time.Second
- firstSettingsTimeout = 2 * time.Second // should be in-flight with preface anyway
- handlerChunkWriteSize = 4 << 10
- defaultMaxStreams = 250 // TODO: make this 100 as the GFE seems to?
+ prefaceTimeout = 10 * time.Second
+ firstSettingsTimeout = 2 * time.Second // should be in-flight with preface anyway
+ handlerChunkWriteSize = 4 << 10
+ defaultMaxStreams = 250 // TODO: make this 100 as the GFE seems to?
+ maxQueuedControlFrames = 10000
)
var (
@@ -163,6 +164,15 @@
return defaultMaxStreams
}
+// maxQueuedControlFrames is the maximum number of control frames like
+// SETTINGS, PING and RST_STREAM that will be queued for writing before
+// the connection is closed to prevent memory exhaustion attacks.
+func (s *Server) maxQueuedControlFrames() int {
+ // TODO: if anybody asks, add a Server field, and remember to define the
+ // behavior of negative values.
+ return maxQueuedControlFrames
+}
+
type serverInternalState struct {
mu sync.Mutex
activeConns map[*serverConn]struct{}
@@ -482,6 +492,7 @@
sawFirstSettings bool // got the initial SETTINGS frame after the preface
needToSendSettingsAck bool
unackedSettings int // how many SETTINGS have we sent without ACKs?
+ queuedControlFrames int // control frames in the writeSched queue
clientMaxStreams uint32 // SETTINGS_MAX_CONCURRENT_STREAMS from client (our PUSH_PROMISE limit)
advMaxStreams uint32 // our SETTINGS_MAX_CONCURRENT_STREAMS advertised the client
curClientStreams uint32 // number of open streams initiated by the client
@@ -870,6 +881,14 @@
}
}
+ // If the peer is causing us to generate a lot of control frames,
+ // but not reading them from us, assume they are trying to make us
+ // run out of memory.
+ if sc.queuedControlFrames > sc.srv.maxQueuedControlFrames() {
+ sc.vlogf("http2: too many control frames in send queue, closing connection")
+ return
+ }
+
// Start the shutdown timer after sending a GOAWAY. When sending GOAWAY
// with no error code (graceful shutdown), don't start the timer until
// all open streams have been completed.
@@ -1069,6 +1088,14 @@
}
if !ignoreWrite {
+ if wr.isControl() {
+ sc.queuedControlFrames++
+ // For extra safety, detect wraparounds, which should not happen,
+ // and pull the plug.
+ if sc.queuedControlFrames < 0 {
+ sc.conn.Close()
+ }
+ }
sc.writeSched.Push(wr)
}
sc.scheduleFrameWrite()
@@ -1186,10 +1213,8 @@
// If a frame is already being written, nothing happens. This will be called again
// when the frame is done being written.
//
-// If a frame isn't being written we need to send one, the best frame
-// to send is selected, preferring first things that aren't
-// stream-specific (e.g. ACKing settings), and then finding the
-// highest priority stream.
+// If a frame isn't being written and we need to send one, the best frame
+// to send is selected by writeSched.
//
// If a frame isn't being written and there's nothing else to send, we
// flush the write buffer.
@@ -1217,6 +1242,9 @@
}
if !sc.inGoAway || sc.goAwayCode == ErrCodeNo {
if wr, ok := sc.writeSched.Pop(); ok {
+ if wr.isControl() {
+ sc.queuedControlFrames--
+ }
sc.startFrameWrite(wr)
continue
}
@@ -1509,6 +1537,8 @@
if err := f.ForeachSetting(sc.processSetting); err != nil {
return err
}
+ // TODO: judging by RFC 7540, Section 6.5.3 each SETTINGS frame should be
+ // acknowledged individually, even if multiple are received before the ACK.
sc.needToSendSettingsAck = true
sc.scheduleFrameWrite()
return nil
@@ -2307,16 +2337,7 @@
func (cw chunkWriter) Write(p []byte) (n int, err error) { return cw.rws.writeChunk(p) }
-func (rws *responseWriterState) hasTrailers() bool { return len(rws.trailers) > 0 }
-
-func (rws *responseWriterState) hasNonemptyTrailers() bool {
- for _, trailer := range rws.trailers {
- if _, ok := rws.handlerHeader[trailer]; ok {
- return true
- }
- }
- return false
-}
+func (rws *responseWriterState) hasTrailers() bool { return len(rws.trailers) != 0 }
// declareTrailer is called for each Trailer header when the
// response header is written. It notes that a header will need to be
@@ -2416,10 +2437,7 @@
rws.promoteUndeclaredTrailers()
}
- // only send trailers if they have actually been defined by the
- // server handler.
- hasNonemptyTrailers := rws.hasNonemptyTrailers()
- endStream := rws.handlerDone && !hasNonemptyTrailers
+ endStream := rws.handlerDone && !rws.hasTrailers()
if len(p) > 0 || endStream {
// only send a 0 byte DATA frame if we're ending the stream.
if err := rws.conn.writeDataFromHandler(rws.stream, p, endStream); err != nil {
@@ -2428,7 +2446,7 @@
}
}
- if rws.handlerDone && hasNonemptyTrailers {
+ if rws.handlerDone && rws.hasTrailers() {
err = rws.conn.writeHeaders(rws.stream, &writeResHeaders{
streamID: rws.stream.id,
h: rws.handlerHeader,