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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 proc
import (
"fmt"
"gvisor.dev/gvisor/pkg/sentry/context"
"gvisor.dev/gvisor/pkg/sentry/fs/proc/seqfile"
"gvisor.dev/gvisor/pkg/sentry/kernel"
)
// versionData backs /proc/version.
//
// +stateify savable
type versionData struct {
// k is the owning Kernel.
k *kernel.Kernel
}
// NeedsUpdate implements seqfile.SeqSource.NeedsUpdate.
func (*versionData) NeedsUpdate(generation int64) bool {
return true
}
// ReadSeqFileData implements seqfile.SeqSource.ReadSeqFileData.
func (v *versionData) ReadSeqFileData(ctx context.Context, h seqfile.SeqHandle) ([]seqfile.SeqData, int64) {
if h != nil {
return nil, 0
}
init := v.k.GlobalInit()
if init == nil {
// Attempted to read before the init Task is created. This can
// only occur during startup, which should never need to read
// this file.
panic("Attempted to read version before initial Task is available")
}
// /proc/version takes the form:
//
// "SYSNAME version RELEASE (COMPILE_USER@COMPILE_HOST)
// (COMPILER_VERSION) VERSION"
//
// where:
// - SYSNAME, RELEASE, and VERSION are the same as returned by
// sys_utsname
// - COMPILE_USER is the user that build the kernel
// - COMPILE_HOST is the hostname of the machine on which the kernel
// was built
// - COMPILER_VERSION is the version reported by the building compiler
//
// Since we don't really want to expose build information to
// applications, those fields are omitted.
//
// FIXME(mpratt): Using Version from the init task SyscallTable
// disregards the different version a task may have (e.g., in a uts
// namespace).
ver := init.Leader().SyscallTable().Version
return []seqfile.SeqData{
{
Buf: []byte(fmt.Sprintf("%s version %s %s\n", ver.Sysname, ver.Release, ver.Version)),
Handle: (*versionData)(nil),
},
}, 0
}
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