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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 fs_test
import (
"testing"
"gvisor.dev/gvisor/pkg/sentry/context"
"gvisor.dev/gvisor/pkg/sentry/fs"
"gvisor.dev/gvisor/pkg/sentry/fs/fsutil"
"gvisor.dev/gvisor/pkg/sentry/fs/ramfs"
"gvisor.dev/gvisor/pkg/sentry/kernel/contexttest"
)
// Creates a new MountNamespace with filesystem:
// / (root dir)
// |-foo (dir)
// |-bar (file)
func createMountNamespace(ctx context.Context) (*fs.MountNamespace, error) {
perms := fs.FilePermsFromMode(0777)
m := fs.NewPseudoMountSource()
barFile := fsutil.NewSimpleFileInode(ctx, fs.RootOwner, perms, 0)
fooDir := ramfs.NewDir(ctx, map[string]*fs.Inode{
"bar": fs.NewInode(barFile, m, fs.StableAttr{Type: fs.RegularFile}),
}, fs.RootOwner, perms)
rootDir := ramfs.NewDir(ctx, map[string]*fs.Inode{
"foo": fs.NewInode(fooDir, m, fs.StableAttr{Type: fs.Directory}),
}, fs.RootOwner, perms)
return fs.NewMountNamespace(ctx, fs.NewInode(rootDir, m, fs.StableAttr{Type: fs.Directory}))
}
func TestFindLink(t *testing.T) {
ctx := contexttest.Context(t)
mm, err := createMountNamespace(ctx)
if err != nil {
t.Fatalf("createMountNamespace failed: %v", err)
}
root := mm.Root()
defer root.DecRef()
foo, err := root.Walk(ctx, root, "foo")
if err != nil {
t.Fatalf("Error walking to foo: %v", err)
}
// Positive cases.
for _, tc := range []struct {
findPath string
wd *fs.Dirent
wantPath string
}{
{".", root, "/"},
{".", foo, "/foo"},
{"..", foo, "/"},
{"../../..", foo, "/"},
{"///foo", foo, "/foo"},
{"/foo", foo, "/foo"},
{"/foo/bar", foo, "/foo/bar"},
{"/foo/.///./bar", foo, "/foo/bar"},
{"/foo///bar", foo, "/foo/bar"},
{"/foo/../foo/bar", foo, "/foo/bar"},
{"foo/bar", root, "/foo/bar"},
{"foo////bar", root, "/foo/bar"},
{"bar", foo, "/foo/bar"},
} {
wdPath, _ := tc.wd.FullName(root)
maxTraversals := uint(0)
if d, err := mm.FindLink(ctx, root, tc.wd, tc.findPath, &maxTraversals); err != nil {
t.Errorf("FindLink(%q, wd=%q) failed: %v", tc.findPath, wdPath, err)
} else if got, _ := d.FullName(root); got != tc.wantPath {
t.Errorf("FindLink(%q, wd=%q) got dirent %q, want %q", tc.findPath, wdPath, got, tc.wantPath)
}
}
// Negative cases.
for _, tc := range []struct {
findPath string
wd *fs.Dirent
}{
{"bar", root},
{"/bar", root},
{"/foo/../../bar", root},
{"foo", foo},
} {
wdPath, _ := tc.wd.FullName(root)
maxTraversals := uint(0)
if _, err := mm.FindLink(ctx, root, tc.wd, tc.findPath, &maxTraversals); err == nil {
t.Errorf("FindLink(%q, wd=%q) did not return error", tc.findPath, wdPath)
}
}
}
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