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