1 files changed, 78 insertions, 0 deletions
diff --git a/pkg/sentry/platform/kvm/virtual_map_test.go b/pkg/sentry/platform/kvm/virtual_map_test.go
new file mode 100644
index 000000000..31e5b0e61
--- /dev/null
+++ b/pkg/sentry/platform/kvm/virtual_map_test.go
@@ -0,0 +1,78 @@
+// 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 kvm
+
+import (
+	"syscall"
+	"testing"
+
+	"gvisor.googlesource.com/gvisor/pkg/sentry/usermem"
+)
+
+type checker struct {
+	ok bool
+}
+
+func (c *checker) Contains(addr uintptr) func(virtualRegion) {
+	c.ok = false // Reset for below calls.
+	return func(vr virtualRegion) {
+		if vr.virtual <= addr && addr < vr.virtual+vr.length {
+			c.ok = true
+		}
+	}
+}
+
+func TestParseMaps(t *testing.T) {
+	c := new(checker)
+
+	// Simple test.
+	if err := applyVirtualRegions(c.Contains(0)); err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	// MMap a new page.
+	addr, _, errno := syscall.RawSyscall6(
+		syscall.SYS_MMAP, 0, usermem.PageSize,
+		syscall.PROT_READ|syscall.PROT_WRITE,
+		syscall.MAP_ANONYMOUS|syscall.MAP_PRIVATE, 0, 0)
+	if errno != 0 {
+		t.Fatalf("unexpected map error: %v", errno)
+	}
+
+	// Re-parse maps.
+	if err := applyVirtualRegions(c.Contains(addr)); err != nil {
+		syscall.RawSyscall(syscall.SYS_MUNMAP, addr, usermem.PageSize, 0)
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	// Assert that it now does contain the region.
+	if !c.ok {
+		syscall.RawSyscall(syscall.SYS_MUNMAP, addr, usermem.PageSize, 0)
+		t.Fatalf("updated map does not contain 0x%08x, expected true", addr)
+	}
+
+	// Unmap the region.
+	syscall.RawSyscall(syscall.SYS_MUNMAP, addr, usermem.PageSize, 0)
+
+	// Re-parse maps.
+	if err := applyVirtualRegions(c.Contains(addr)); err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	// Assert that it once again does _not_ contain the region.
+	if c.ok {
+		t.Fatalf("final map does contain 0x%08x, expected false", addr)
+	}
+}