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// Copyright 2018 The gVisor Authors.
//
// 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
accessType usermem.AccessType
}
func (c *checker) Containing(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
c.accessType = vr.accessType
}
}
}
func TestParseMaps(t *testing.T) {
c := new(checker)
// Simple test.
if err := applyVirtualRegions(c.Containing(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.Containing(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)
}
// Map the region as PROT_NONE.
newAddr, _, errno := syscall.RawSyscall6(
syscall.SYS_MMAP, addr, usermem.PageSize,
syscall.PROT_NONE,
syscall.MAP_ANONYMOUS|syscall.MAP_FIXED|syscall.MAP_PRIVATE, 0, 0)
if errno != 0 {
t.Fatalf("unexpected map error: %v", errno)
}
if newAddr != addr {
t.Fatalf("unable to remap address: got 0x%08x, wanted 0x%08x", newAddr, addr)
}
// Re-parse maps.
if err := applyVirtualRegions(c.Containing(addr)); err != nil {
t.Fatalf("unexpected error: %v", err)
}
if !c.ok {
t.Fatalf("final map does not contain 0x%08x, expected true", addr)
}
if c.accessType.Read || c.accessType.Write || c.accessType.Execute {
t.Fatalf("final map has incorrect permissions for 0x%08x", addr)
}
// Unmap the region.
syscall.RawSyscall(syscall.SYS_MUNMAP, addr, usermem.PageSize, 0)
}
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