69 lines
2.2 KiB
Go
69 lines
2.2 KiB
Go
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// Copyright 2019 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 proc
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import (
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"bytes"
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"fmt"
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"gvisor.dev/gvisor/pkg/sentry/context"
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"gvisor.dev/gvisor/pkg/sentry/kernel"
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"gvisor.dev/gvisor/pkg/sentry/vfs"
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)
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// versionData implements vfs.DynamicBytesSource for /proc/version.
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//
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// +stateify savable
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type versionData struct {
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// k is the owning Kernel.
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k *kernel.Kernel
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}
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var _ vfs.DynamicBytesSource = (*versionData)(nil)
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// Generate implements vfs.DynamicBytesSource.Generate.
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func (v *versionData) Generate(ctx context.Context, buf *bytes.Buffer) error {
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init := v.k.GlobalInit()
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if init == nil {
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// Attempted to read before the init Task is created. This can
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// only occur during startup, which should never need to read
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// this file.
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panic("Attempted to read version before initial Task is available")
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}
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// /proc/version takes the form:
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//
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// "SYSNAME version RELEASE (COMPILE_USER@COMPILE_HOST)
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// (COMPILER_VERSION) VERSION"
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//
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// where:
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// - SYSNAME, RELEASE, and VERSION are the same as returned by
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// sys_utsname
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// - COMPILE_USER is the user that build the kernel
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// - COMPILE_HOST is the hostname of the machine on which the kernel
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// was built
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// - COMPILER_VERSION is the version reported by the building compiler
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//
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// Since we don't really want to expose build information to
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// applications, those fields are omitted.
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//
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// FIXME(mpratt): Using Version from the init task SyscallTable
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// disregards the different version a task may have (e.g., in a uts
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// namespace).
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ver := init.Leader().SyscallTable().Version
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fmt.Fprintf(buf, "%s version %s %s\n", ver.Sysname, ver.Release, ver.Version)
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return nil
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}
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