2019-04-29 21:25:05 +00:00
|
|
|
// Copyright 2018 The gVisor Authors.
|
2018-04-27 17:37:02 +00:00
|
|
|
//
|
|
|
|
// 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 boot
|
|
|
|
|
|
|
|
import (
|
|
|
|
"fmt"
|
|
|
|
|
2019-06-13 23:49:09 +00:00
|
|
|
"gvisor.dev/gvisor/pkg/sentry/context"
|
|
|
|
"gvisor.dev/gvisor/pkg/sentry/fs"
|
|
|
|
"gvisor.dev/gvisor/pkg/sentry/fs/host"
|
|
|
|
"gvisor.dev/gvisor/pkg/sentry/kernel"
|
2018-04-27 17:37:02 +00:00
|
|
|
)
|
|
|
|
|
2019-07-03 02:27:51 +00:00
|
|
|
// createFDTable creates an FD table that contains stdin, stdout, and stderr.
|
|
|
|
// If console is true, then ioctl calls will be passed through to the host FD.
|
2018-09-20 05:19:10 +00:00
|
|
|
// Upon success, createFDMap dups then closes stdioFDs.
|
2019-07-03 02:27:51 +00:00
|
|
|
func createFDTable(ctx context.Context, console bool, stdioFDs []int) (*kernel.FDTable, error) {
|
2018-09-20 05:19:10 +00:00
|
|
|
if len(stdioFDs) != 3 {
|
|
|
|
return nil, fmt.Errorf("stdioFDs should contain exactly 3 FDs (stdin, stdout, and stderr), but %d FDs received", len(stdioFDs))
|
|
|
|
}
|
|
|
|
|
2019-06-04 01:19:52 +00:00
|
|
|
k := kernel.KernelFromContext(ctx)
|
2019-07-03 02:27:51 +00:00
|
|
|
fdTable := k.NewFDTable()
|
|
|
|
defer fdTable.DecRef()
|
2018-10-17 19:27:58 +00:00
|
|
|
mounter := fs.FileOwnerFromContext(ctx)
|
2018-04-27 17:37:02 +00:00
|
|
|
|
2018-10-17 19:27:58 +00:00
|
|
|
var ttyFile *fs.File
|
2019-07-03 02:27:51 +00:00
|
|
|
for appFD, hostFD := range stdioFDs {
|
2018-10-17 19:27:58 +00:00
|
|
|
var appFile *fs.File
|
|
|
|
|
|
|
|
if console && appFD < 3 {
|
|
|
|
// Import the file as a host TTY file.
|
|
|
|
if ttyFile == nil {
|
|
|
|
var err error
|
|
|
|
appFile, err = host.ImportFile(ctx, hostFD, mounter, true /* isTTY */)
|
|
|
|
if err != nil {
|
|
|
|
return nil, err
|
|
|
|
}
|
|
|
|
defer appFile.DecRef()
|
|
|
|
|
|
|
|
// Remember this in the TTY file, as we will
|
|
|
|
// use it for the other stdio FDs.
|
|
|
|
ttyFile = appFile
|
|
|
|
} else {
|
|
|
|
// Re-use the existing TTY file, as all three
|
|
|
|
// stdio FDs must point to the same fs.File in
|
|
|
|
// order to share TTY state, specifically the
|
|
|
|
// foreground process group id.
|
|
|
|
appFile = ttyFile
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
// Import the file as a regular host file.
|
|
|
|
var err error
|
|
|
|
appFile, err = host.ImportFile(ctx, hostFD, mounter, false /* isTTY */)
|
|
|
|
if err != nil {
|
|
|
|
return nil, err
|
|
|
|
}
|
|
|
|
defer appFile.DecRef()
|
2018-04-27 17:37:02 +00:00
|
|
|
}
|
2018-10-17 19:27:58 +00:00
|
|
|
|
|
|
|
// Add the file to the FD map.
|
2019-07-03 02:27:51 +00:00
|
|
|
if err := fdTable.NewFDAt(ctx, int32(appFD), appFile, kernel.FDFlags{}); err != nil {
|
2018-10-17 19:27:58 +00:00
|
|
|
return nil, err
|
2018-04-27 17:37:02 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2019-07-03 02:27:51 +00:00
|
|
|
fdTable.IncRef()
|
|
|
|
return fdTable, nil
|
2018-04-27 17:37:02 +00:00
|
|
|
}
|