112 lines
3.3 KiB
Go
112 lines
3.3 KiB
Go
// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package linux
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import (
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"time"
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"gvisor.dev/gvisor/pkg/abi/linux"
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"gvisor.dev/gvisor/pkg/sentry/kernel"
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"gvisor.dev/gvisor/pkg/syserror"
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"gvisor.dev/gvisor/pkg/usermem"
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)
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// copyTimespecIn copies a Timespec from the untrusted app range to the kernel.
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func copyTimespecIn(t *kernel.Task, addr usermem.Addr) (linux.Timespec, error) {
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switch t.Arch().Width() {
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case 8:
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ts := linux.Timespec{}
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in := t.CopyScratchBuffer(16)
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_, err := t.CopyInBytes(addr, in)
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if err != nil {
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return ts, err
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}
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ts.Sec = int64(usermem.ByteOrder.Uint64(in[0:]))
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ts.Nsec = int64(usermem.ByteOrder.Uint64(in[8:]))
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return ts, nil
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default:
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return linux.Timespec{}, syserror.ENOSYS
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}
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}
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// copyTimespecOut copies a Timespec to the untrusted app range.
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func copyTimespecOut(t *kernel.Task, addr usermem.Addr, ts *linux.Timespec) error {
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switch t.Arch().Width() {
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case 8:
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out := t.CopyScratchBuffer(16)
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usermem.ByteOrder.PutUint64(out[0:], uint64(ts.Sec))
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usermem.ByteOrder.PutUint64(out[8:], uint64(ts.Nsec))
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_, err := t.CopyOutBytes(addr, out)
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return err
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default:
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return syserror.ENOSYS
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}
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}
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// copyTimevalIn copies a Timeval from the untrusted app range to the kernel.
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func copyTimevalIn(t *kernel.Task, addr usermem.Addr) (linux.Timeval, error) {
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switch t.Arch().Width() {
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case 8:
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tv := linux.Timeval{}
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in := t.CopyScratchBuffer(16)
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_, err := t.CopyInBytes(addr, in)
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if err != nil {
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return tv, err
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}
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tv.Sec = int64(usermem.ByteOrder.Uint64(in[0:]))
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tv.Usec = int64(usermem.ByteOrder.Uint64(in[8:]))
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return tv, nil
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default:
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return linux.Timeval{}, syserror.ENOSYS
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}
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}
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// copyTimevalOut copies a Timeval to the untrusted app range.
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func copyTimevalOut(t *kernel.Task, addr usermem.Addr, tv *linux.Timeval) error {
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switch t.Arch().Width() {
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case 8:
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out := t.CopyScratchBuffer(16)
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usermem.ByteOrder.PutUint64(out[0:], uint64(tv.Sec))
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usermem.ByteOrder.PutUint64(out[8:], uint64(tv.Usec))
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_, err := t.CopyOutBytes(addr, out)
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return err
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default:
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return syserror.ENOSYS
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}
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}
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// copyTimespecInToDuration copies a Timespec from the untrusted app range,
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// validates it and converts it to a Duration.
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//
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// If the Timespec is larger than what can be represented in a Duration, the
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// returned value is the maximum that Duration will allow.
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//
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// If timespecAddr is NULL, the returned value is negative.
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func copyTimespecInToDuration(t *kernel.Task, timespecAddr usermem.Addr) (time.Duration, error) {
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// Use a negative Duration to indicate "no timeout".
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timeout := time.Duration(-1)
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if timespecAddr != 0 {
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timespec, err := copyTimespecIn(t, timespecAddr)
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if err != nil {
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return 0, err
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}
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if !timespec.Valid() {
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return 0, syserror.EINVAL
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}
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timeout = time.Duration(timespec.ToNsecCapped())
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}
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return timeout, nil
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}
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