60 lines
1.9 KiB
Go
60 lines
1.9 KiB
Go
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// Copyright 2020 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 memdev implements "mem" character devices, as implemented in Linux
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// by drivers/char/mem.c and drivers/char/random.c.
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package memdev
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import (
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"gvisor.dev/gvisor/pkg/abi/linux"
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"gvisor.dev/gvisor/pkg/context"
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"gvisor.dev/gvisor/pkg/sentry/fsimpl/devtmpfs"
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"gvisor.dev/gvisor/pkg/sentry/vfs"
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)
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// Register registers all devices implemented by this package in vfsObj.
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func Register(vfsObj *vfs.VirtualFilesystem) error {
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for minor, dev := range map[uint32]vfs.Device{
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nullDevMinor: nullDevice{},
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zeroDevMinor: zeroDevice{},
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fullDevMinor: fullDevice{},
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randomDevMinor: randomDevice{},
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urandomDevMinor: randomDevice{},
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} {
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if err := vfsObj.RegisterDevice(vfs.CharDevice, linux.MEM_MAJOR, minor, dev, &vfs.RegisterDeviceOptions{
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GroupName: "mem",
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}); err != nil {
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return err
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}
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}
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return nil
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}
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// CreateDevtmpfsFiles creates device special files in dev representing all
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// devices implemented by this package.
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func CreateDevtmpfsFiles(ctx context.Context, dev *devtmpfs.Accessor) error {
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for minor, name := range map[uint32]string{
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nullDevMinor: "null",
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zeroDevMinor: "zero",
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fullDevMinor: "full",
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randomDevMinor: "random",
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urandomDevMinor: "urandom",
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} {
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if err := dev.CreateDeviceFile(ctx, name, vfs.CharDevice, linux.MEM_MAJOR, minor, 0666 /* mode */); err != nil {
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return err
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}
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}
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return nil
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}
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