Merge pull request #533 from kevinGC:stub-dev-tty
PiperOrigin-RevId: 258607547
This commit is contained in:
commit
682fd2d68f
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@ -11,6 +11,7 @@ go_library(
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"full.go",
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"null.go",
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"random.go",
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"tty.go",
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],
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importpath = "gvisor.dev/gvisor/pkg/sentry/fs/dev",
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visibility = ["//pkg/sentry:internal"],
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@ -38,12 +38,20 @@ const (
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urandomDevMinor uint32 = 9
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)
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func newCharacterDevice(ctx context.Context, iops fs.InodeOperations, msrc *fs.MountSource) *fs.Inode {
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// TTY major device number comes from include/uapi/linux/major.h.
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const (
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ttyDevMinor = 0
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ttyDevMajor = 5
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)
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func newCharacterDevice(ctx context.Context, iops fs.InodeOperations, msrc *fs.MountSource, major uint16, minor uint32) *fs.Inode {
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return fs.NewInode(ctx, iops, msrc, fs.StableAttr{
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DeviceID: devDevice.DeviceID(),
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InodeID: devDevice.NextIno(),
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BlockSize: usermem.PageSize,
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Type: fs.CharacterDevice,
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DeviceID: devDevice.DeviceID(),
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InodeID: devDevice.NextIno(),
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BlockSize: usermem.PageSize,
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Type: fs.CharacterDevice,
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DeviceFileMajor: major,
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DeviceFileMinor: minor,
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})
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}
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@ -114,6 +122,8 @@ func New(ctx context.Context, msrc *fs.MountSource) *fs.Inode {
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// If no devpts is mounted, this will simply be a dangling
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// symlink, which is fine.
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"ptmx": newSymlink(ctx, "pts/ptmx", msrc),
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"tty": newCharacterDevice(ctx, newTTYDevice(ctx, fs.RootOwner, 0666), msrc, ttyDevMajor, ttyDevMinor),
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}
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iops := ramfs.NewDir(ctx, contents, fs.RootOwner, fs.FilePermsFromMode(0555))
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@ -0,0 +1,67 @@
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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 dev
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import (
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"gvisor.dev/gvisor/pkg/abi/linux"
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"gvisor.dev/gvisor/pkg/sentry/context"
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"gvisor.dev/gvisor/pkg/sentry/fs"
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"gvisor.dev/gvisor/pkg/sentry/fs/fsutil"
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"gvisor.dev/gvisor/pkg/waiter"
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)
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// +stateify savable
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type ttyInodeOperations struct {
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fsutil.InodeGenericChecker `state:"nosave"`
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fsutil.InodeNoExtendedAttributes `state:"nosave"`
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fsutil.InodeNoopAllocate `state:"nosave"`
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fsutil.InodeNoopRelease `state:"nosave"`
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fsutil.InodeNoopTruncate `state:"nosave"`
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fsutil.InodeNoopWriteOut `state:"nosave"`
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fsutil.InodeNotDirectory `state:"nosave"`
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fsutil.InodeNotMappable `state:"nosave"`
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fsutil.InodeNotOpenable `state:"nosave"`
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fsutil.InodeNotSocket `state:"nosave"`
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fsutil.InodeNotSymlink `state:"nosave"`
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fsutil.InodeVirtual `state:"nosave"`
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fsutil.InodeSimpleAttributes
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}
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var _ fs.InodeOperations = (*ttyInodeOperations)(nil)
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func newTTYDevice(ctx context.Context, owner fs.FileOwner, mode linux.FileMode) *ttyInodeOperations {
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return &ttyInodeOperations{
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InodeSimpleAttributes: fsutil.NewInodeSimpleAttributes(ctx, owner, fs.FilePermsFromMode(mode), linux.TMPFS_MAGIC),
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}
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}
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// +stateify savable
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type ttyFileOperations struct {
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fsutil.FileNoSeek `state:"nosave"`
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fsutil.FileNoIoctl `state:"nosave"`
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fsutil.FileNoMMap `state:"nosave"`
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fsutil.FileNoSplice `state:"nosave"`
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fsutil.FileNoopFlush `state:"nosave"`
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fsutil.FileNoopFsync `state:"nosave"`
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fsutil.FileNoopRelease `state:"nosave"`
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fsutil.FileNoopWrite `state:"nosave"`
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fsutil.FileNoopRead `state:"nosave"`
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fsutil.FileNotDirReaddir `state:"nosave"`
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fsutil.FileUseInodeUnstableAttr `state:"nosave"`
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waiter.AlwaysReady `state:"nosave"`
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}
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var _ fs.FileOperations = (*ttyFileOperations)(nil)
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@ -13,7 +13,10 @@
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// limitations under the License.
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <vector>
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#include "gmock/gmock.h"
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@ -143,6 +146,13 @@ TEST(DevTest, WriteDevFull) {
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EXPECT_THAT(WriteFd(fd.get(), "a", 1), SyscallFailsWithErrno(ENOSPC));
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}
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TEST(DevTest, TTYExists) {
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struct stat statbuf = {};
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ASSERT_THAT(stat("/dev/tty", &statbuf), SyscallSucceeds());
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// Check that it's a character device with rw-rw-rw- permissions.
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EXPECT_EQ(statbuf.st_mode, S_IFCHR | 0666);
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}
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} // namespace
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} // namespace testing
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