diff options
Diffstat (limited to 'pkg/sentry/fsimpl/fuse/dev.go')
| -rw-r--r-- | pkg/sentry/fsimpl/fuse/dev.go | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/pkg/sentry/fsimpl/fuse/dev.go b/pkg/sentry/fsimpl/fuse/dev.go index dc33268af..c9e12a94f 100644 --- a/pkg/sentry/fsimpl/fuse/dev.go +++ b/pkg/sentry/fsimpl/fuse/dev.go @@ -51,6 +51,9 @@ type DeviceFD struct { vfs.DentryMetadataFileDescriptionImpl vfs.NoLockFD + // mounted specifies whether a FUSE filesystem was mounted using the DeviceFD. + mounted bool + // TODO(gvisor.dev/issue/2987): Add all the data structures needed to enqueue // and deque requests, control synchronization and establish communication // between the FUSE kernel module and the /dev/fuse character device. @@ -61,26 +64,51 @@ func (fd *DeviceFD) Release() {} // PRead implements vfs.FileDescriptionImpl.PRead. func (fd *DeviceFD) PRead(ctx context.Context, dst usermem.IOSequence, offset int64, opts vfs.ReadOptions) (int64, error) { + // Operations on /dev/fuse don't make sense until a FUSE filesystem is mounted. + if !fd.mounted { + return 0, syserror.EPERM + } + return 0, syserror.ENOSYS } // Read implements vfs.FileDescriptionImpl.Read. func (fd *DeviceFD) Read(ctx context.Context, dst usermem.IOSequence, opts vfs.ReadOptions) (int64, error) { + // Operations on /dev/fuse don't make sense until a FUSE filesystem is mounted. + if !fd.mounted { + return 0, syserror.EPERM + } + return 0, syserror.ENOSYS } // PWrite implements vfs.FileDescriptionImpl.PWrite. func (fd *DeviceFD) PWrite(ctx context.Context, src usermem.IOSequence, offset int64, opts vfs.WriteOptions) (int64, error) { + // Operations on /dev/fuse don't make sense until a FUSE filesystem is mounted. + if !fd.mounted { + return 0, syserror.EPERM + } + return 0, syserror.ENOSYS } // Write implements vfs.FileDescriptionImpl.Write. func (fd *DeviceFD) Write(ctx context.Context, src usermem.IOSequence, opts vfs.WriteOptions) (int64, error) { + // Operations on /dev/fuse don't make sense until a FUSE filesystem is mounted. + if !fd.mounted { + return 0, syserror.EPERM + } + return 0, syserror.ENOSYS } // Seek implements vfs.FileDescriptionImpl.Seek. func (fd *DeviceFD) Seek(ctx context.Context, offset int64, whence int32) (int64, error) { + // Operations on /dev/fuse don't make sense until a FUSE filesystem is mounted. + if !fd.mounted { + return 0, syserror.EPERM + } + return 0, syserror.ENOSYS } |