112 lines
3.3 KiB
Go
112 lines
3.3 KiB
Go
// 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 linux
|
|
|
|
import (
|
|
"time"
|
|
|
|
"gvisor.dev/gvisor/pkg/abi/linux"
|
|
"gvisor.dev/gvisor/pkg/sentry/kernel"
|
|
"gvisor.dev/gvisor/pkg/sentry/usermem"
|
|
"gvisor.dev/gvisor/pkg/syserror"
|
|
)
|
|
|
|
// copyTimespecIn copies a Timespec from the untrusted app range to the kernel.
|
|
func copyTimespecIn(t *kernel.Task, addr usermem.Addr) (linux.Timespec, error) {
|
|
switch t.Arch().Width() {
|
|
case 8:
|
|
ts := linux.Timespec{}
|
|
in := t.CopyScratchBuffer(16)
|
|
_, err := t.CopyInBytes(addr, in)
|
|
if err != nil {
|
|
return ts, err
|
|
}
|
|
ts.Sec = int64(usermem.ByteOrder.Uint64(in[0:]))
|
|
ts.Nsec = int64(usermem.ByteOrder.Uint64(in[8:]))
|
|
return ts, nil
|
|
default:
|
|
return linux.Timespec{}, syserror.ENOSYS
|
|
}
|
|
}
|
|
|
|
// copyTimespecOut copies a Timespec to the untrusted app range.
|
|
func copyTimespecOut(t *kernel.Task, addr usermem.Addr, ts *linux.Timespec) error {
|
|
switch t.Arch().Width() {
|
|
case 8:
|
|
out := t.CopyScratchBuffer(16)
|
|
usermem.ByteOrder.PutUint64(out[0:], uint64(ts.Sec))
|
|
usermem.ByteOrder.PutUint64(out[8:], uint64(ts.Nsec))
|
|
_, err := t.CopyOutBytes(addr, out)
|
|
return err
|
|
default:
|
|
return syserror.ENOSYS
|
|
}
|
|
}
|
|
|
|
// copyTimevalIn copies a Timeval from the untrusted app range to the kernel.
|
|
func copyTimevalIn(t *kernel.Task, addr usermem.Addr) (linux.Timeval, error) {
|
|
switch t.Arch().Width() {
|
|
case 8:
|
|
tv := linux.Timeval{}
|
|
in := t.CopyScratchBuffer(16)
|
|
_, err := t.CopyInBytes(addr, in)
|
|
if err != nil {
|
|
return tv, err
|
|
}
|
|
tv.Sec = int64(usermem.ByteOrder.Uint64(in[0:]))
|
|
tv.Usec = int64(usermem.ByteOrder.Uint64(in[8:]))
|
|
return tv, nil
|
|
default:
|
|
return linux.Timeval{}, syserror.ENOSYS
|
|
}
|
|
}
|
|
|
|
// copyTimevalOut copies a Timeval to the untrusted app range.
|
|
func copyTimevalOut(t *kernel.Task, addr usermem.Addr, tv *linux.Timeval) error {
|
|
switch t.Arch().Width() {
|
|
case 8:
|
|
out := t.CopyScratchBuffer(16)
|
|
usermem.ByteOrder.PutUint64(out[0:], uint64(tv.Sec))
|
|
usermem.ByteOrder.PutUint64(out[8:], uint64(tv.Usec))
|
|
_, err := t.CopyOutBytes(addr, out)
|
|
return err
|
|
default:
|
|
return syserror.ENOSYS
|
|
}
|
|
}
|
|
|
|
// copyTimespecInToDuration copies a Timespec from the untrusted app range,
|
|
// validates it and converts it to a Duration.
|
|
//
|
|
// If the Timespec is larger than what can be represented in a Duration, the
|
|
// returned value is the maximum that Duration will allow.
|
|
//
|
|
// If timespecAddr is NULL, the returned value is negative.
|
|
func copyTimespecInToDuration(t *kernel.Task, timespecAddr usermem.Addr) (time.Duration, error) {
|
|
// Use a negative Duration to indicate "no timeout".
|
|
timeout := time.Duration(-1)
|
|
if timespecAddr != 0 {
|
|
timespec, err := copyTimespecIn(t, timespecAddr)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
if !timespec.Valid() {
|
|
return 0, syserror.EINVAL
|
|
}
|
|
timeout = time.Duration(timespec.ToNsecCapped())
|
|
}
|
|
return timeout, nil
|
|
}
|