Check in gVisor.

PiperOrigin-RevId: 194583126
Change-Id: Ica1d8821a90f74e7e745962d71801c598c652463

1 files changed, 130 insertions, 0 deletions

diff --git a/pkg/sentry/fs/ashmem/pin_board_test.go b/pkg/sentry/fs/ashmem/pin_board_test.go
new file mode 100644
index 000000000..f4ea5de6d
--- /dev/null
+++ b/pkg/sentry/fs/ashmem/pin_board_test.go
@@ -0,0 +1,130 @@
+// Copyright 2018 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ashmem
+
+import (
+	"testing"
+
+	"gvisor.googlesource.com/gvisor/pkg/abi/linux"
+	"gvisor.googlesource.com/gvisor/pkg/sentry/usermem"
+)
+
+func TestPinBoard(t *testing.T) {
+	pb := NewPinBoard()
+
+	// Confirm that all pages are pinned.
+	if !pb.RangePinnedStatus(RangeFromAshmemPin(linux.AshmemPin{0, 0})) {
+		t.Errorf("RangePinnedStatus(all pages) returned false (unpinned) at start.")
+	}
+
+	// Unpin pages [1, 11) (counting from 0)
+	pb.UnpinRange(RangeFromAshmemPin(linux.AshmemPin{
+		usermem.PageSize,
+		usermem.PageSize * 10,
+	}))
+
+	// Confirm that pages [1, 11) are unpinned and that page 0 and pages
+	// larger than 10 are pinned.
+	pinned := []linux.AshmemPin{
+		{
+			0,
+			usermem.PageSize,
+		}, {
+			usermem.PageSize * 11,
+			0,
+		},
+	}
+
+	for _, pin := range pinned {
+		if !pb.RangePinnedStatus(RangeFromAshmemPin(pin)) {
+			t.Errorf("RangePinnedStatus(AshmemPin{offset (pages): %v, len (pages): %v}) returned false (unpinned).",
+				pin.Offset, pin.Len)
+		}
+	}
+
+	unpinned := []linux.AshmemPin{
+		{
+			usermem.PageSize,
+			usermem.PageSize * 10,
+		},
+	}
+
+	for _, pin := range unpinned {
+		if pb.RangePinnedStatus(RangeFromAshmemPin(pin)) {
+			t.Errorf("RangePinnedStatus(AshmemPin{offset (pages): %v, len (pages): %v}) returned true (pinned).",
+				pin.Offset, pin.Len)
+		}
+	}
+
+	// Pin pages [2, 6).
+	pb.PinRange(RangeFromAshmemPin(linux.AshmemPin{
+		usermem.PageSize * 2,
+		usermem.PageSize * 4,
+	}))
+
+	// Confirm that pages 0, [2, 6) and pages larger than 10 are pinned
+	// while others remain unpinned.
+	pinned = []linux.AshmemPin{
+		{
+			0,
+			usermem.PageSize,
+		},
+		{
+			usermem.PageSize * 2,
+			usermem.PageSize * 4,
+		},
+		{
+			usermem.PageSize * 11,
+			0,
+		},
+	}
+
+	for _, pin := range pinned {
+		if !pb.RangePinnedStatus(RangeFromAshmemPin(pin)) {
+			t.Errorf("RangePinnedStatus(AshmemPin{offset (pages): %v, len (pages): %v}) returned false (unpinned).",
+				pin.Offset, pin.Len)
+		}
+	}
+
+	unpinned = []linux.AshmemPin{
+		{
+			usermem.PageSize,
+			usermem.PageSize,
+		}, {
+			usermem.PageSize * 6,
+			usermem.PageSize * 5,
+		},
+	}
+
+	for _, pin := range unpinned {
+		if pb.RangePinnedStatus(RangeFromAshmemPin(pin)) {
+			t.Errorf("RangePinnedStatus(AshmemPin{offset (pages): %v, len (pages): %v}) returned true (pinned).",
+				pin.Offset, pin.Len)
+		}
+	}
+
+	// Status of a partially pinned range is unpinned.
+	if pb.RangePinnedStatus(RangeFromAshmemPin(linux.AshmemPin{0, 0})) {
+		t.Errorf("RangePinnedStatus(all pages) returned true (pinned).")
+	}
+
+	// Pin the whole range again.
+	pb.PinRange(RangeFromAshmemPin(linux.AshmemPin{0, 0}))
+
+	// Confirm that all pages are pinned.
+	if !pb.RangePinnedStatus(RangeFromAshmemPin(linux.AshmemPin{0, 0})) {
+		t.Errorf("RangePinnedStatus(all pages) returned false (unpinned) at start.")
+	}
+}