diff options
Diffstat (limited to 'pkg/syserr/syserr.go')
| -rw-r--r-- | pkg/syserr/syserr.go | 293 |
1 files changed, 293 insertions, 0 deletions
diff --git a/pkg/syserr/syserr.go b/pkg/syserr/syserr.go new file mode 100644 index 000000000..4ddbd3322 --- /dev/null +++ b/pkg/syserr/syserr.go @@ -0,0 +1,293 @@ +// Copyright 2018 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 syserr contains sandbox-internal errors. These errors are distinct +// from both the errors returned by host system calls and the errors returned +// to sandboxed applications. +package syserr + +import ( + "fmt" + "syscall" + + "gvisor.googlesource.com/gvisor/pkg/abi/linux" + "gvisor.googlesource.com/gvisor/pkg/syserror" +) + +// Error represents an internal error. +type Error struct { + // message is the human readable form of this Error. + message string + + // noTranslation indicates that this Error cannot be translated to a + // linux.Errno. + noTranslation bool + + // errno is the linux.Errno this Error should be translated to. nil means + // that this Error should be translated to a nil linux.Errno. + errno *linux.Errno +} + +// New creates a new Error and adds a translation for it. +// +// New must only be called at init. +func New(message string, linuxTranslation *linux.Errno) *Error { + err := &Error{message: message, errno: linuxTranslation} + + if linuxTranslation == nil { + return err + } + + // TODO(b/34162363): Remove this. + errno := linuxTranslation.Number() + if errno <= 0 || errno >= len(linuxBackwardsTranslations) { + panic(fmt.Sprint("invalid errno: ", errno)) + } + + e := error(syscall.Errno(errno)) + // syserror.ErrWouldBlock gets translated to syserror.EWOULDBLOCK and + // enables proper blocking semantics. This should temporary address the + // class of blocking bugs that keep popping up with the current state of + // the error space. + if e == syserror.EWOULDBLOCK { + e = syserror.ErrWouldBlock + } + linuxBackwardsTranslations[errno] = linuxBackwardsTranslation{err: e, ok: true} + + return err +} + +// NewDynamic creates a new error with a dynamic error message and an errno +// translation. +// +// NewDynamic should only be used sparingly and not be used for static error +// messages. Errors with static error messages should be declared with New as +// global variables. +func NewDynamic(message string, linuxTranslation *linux.Errno) *Error { + return &Error{message: message, errno: linuxTranslation} +} + +// NewWithoutTranslation creates a new Error. If translation is attempted on +// the error, translation will fail. +// +// NewWithoutTranslation may be called at any time, but static errors should +// be declared as global variables and dynamic errors should be used sparingly. +func NewWithoutTranslation(message string) *Error { + return &Error{message: message, noTranslation: true} +} + +func newWithHost(message string, linuxTranslation *linux.Errno, hostErrno syscall.Errno) *Error { + e := New(message, linuxTranslation) + addLinuxHostTranslation(hostErrno, e) + return e +} + +// String implements fmt.Stringer.String. +func (e *Error) String() string { + if e == nil { + return "<nil>" + } + return e.message +} + +type linuxBackwardsTranslation struct { + err error + ok bool +} + +// TODO(b/34162363): Remove this. +var linuxBackwardsTranslations [maxErrno]linuxBackwardsTranslation + +// ToError translates an Error to a corresponding error value. +// +// TODO(b/34162363): Remove this. +func (e *Error) ToError() error { + if e == nil { + return nil + } + if e.noTranslation { + panic(fmt.Sprintf("error %q does not support translation", e.message)) + } + if e.errno == nil { + return nil + } + errno := e.errno.Number() + if errno <= 0 || errno >= len(linuxBackwardsTranslations) || !linuxBackwardsTranslations[errno].ok { + panic(fmt.Sprintf("unknown error %q (%d)", e.message, errno)) + } + return linuxBackwardsTranslations[errno].err +} + +// ToLinux converts the Error to a Linux ABI error that can be returned to the +// application. +func (e *Error) ToLinux() *linux.Errno { + if e.noTranslation { + panic(fmt.Sprintf("No Linux ABI translation available for %q", e.message)) + } + return e.errno +} + +// TODO(b/34162363): Remove or replace most of these errors. +// +// Some of the errors should be replaced with package specific errors and +// others should be removed entirely. +var ( + ErrNotPermitted = newWithHost("operation not permitted", linux.EPERM, syscall.EPERM) + ErrNoFileOrDir = newWithHost("no such file or directory", linux.ENOENT, syscall.ENOENT) + ErrNoProcess = newWithHost("no such process", linux.ESRCH, syscall.ESRCH) + ErrInterrupted = newWithHost("interrupted system call", linux.EINTR, syscall.EINTR) + ErrIO = newWithHost("I/O error", linux.EIO, syscall.EIO) + ErrDeviceOrAddress = newWithHost("no such device or address", linux.ENXIO, syscall.ENXIO) + ErrTooManyArgs = newWithHost("argument list too long", linux.E2BIG, syscall.E2BIG) + ErrEcec = newWithHost("exec format error", linux.ENOEXEC, syscall.ENOEXEC) + ErrBadFD = newWithHost("bad file number", linux.EBADF, syscall.EBADF) + ErrNoChild = newWithHost("no child processes", linux.ECHILD, syscall.ECHILD) + ErrTryAgain = newWithHost("try again", linux.EAGAIN, syscall.EAGAIN) + ErrNoMemory = newWithHost("out of memory", linux.ENOMEM, syscall.ENOMEM) + ErrPermissionDenied = newWithHost("permission denied", linux.EACCES, syscall.EACCES) + ErrBadAddress = newWithHost("bad address", linux.EFAULT, syscall.EFAULT) + ErrNotBlockDevice = newWithHost("block device required", linux.ENOTBLK, syscall.ENOTBLK) + ErrBusy = newWithHost("device or resource busy", linux.EBUSY, syscall.EBUSY) + ErrExists = newWithHost("file exists", linux.EEXIST, syscall.EEXIST) + ErrCrossDeviceLink = newWithHost("cross-device link", linux.EXDEV, syscall.EXDEV) + ErrNoDevice = newWithHost("no such device", linux.ENODEV, syscall.ENODEV) + ErrNotDir = newWithHost("not a directory", linux.ENOTDIR, syscall.ENOTDIR) + ErrIsDir = newWithHost("is a directory", linux.EISDIR, syscall.EISDIR) + ErrInvalidArgument = newWithHost("invalid argument", linux.EINVAL, syscall.EINVAL) + ErrFileTableOverflow = newWithHost("file table overflow", linux.ENFILE, syscall.ENFILE) + ErrTooManyOpenFiles = newWithHost("too many open files", linux.EMFILE, syscall.EMFILE) + ErrNotTTY = newWithHost("not a typewriter", linux.ENOTTY, syscall.ENOTTY) + ErrTestFileBusy = newWithHost("text file busy", linux.ETXTBSY, syscall.ETXTBSY) + ErrFileTooBig = newWithHost("file too large", linux.EFBIG, syscall.EFBIG) + ErrNoSpace = newWithHost("no space left on device", linux.ENOSPC, syscall.ENOSPC) + ErrIllegalSeek = newWithHost("illegal seek", linux.ESPIPE, syscall.ESPIPE) + ErrReadOnlyFS = newWithHost("read-only file system", linux.EROFS, syscall.EROFS) + ErrTooManyLinks = newWithHost("too many links", linux.EMLINK, syscall.EMLINK) + ErrBrokenPipe = newWithHost("broken pipe", linux.EPIPE, syscall.EPIPE) + ErrDomain = newWithHost("math argument out of domain of func", linux.EDOM, syscall.EDOM) + ErrRange = newWithHost("math result not representable", linux.ERANGE, syscall.ERANGE) + ErrDeadlock = newWithHost("resource deadlock would occur", linux.EDEADLOCK, syscall.EDEADLOCK) + ErrNameTooLong = newWithHost("file name too long", linux.ENAMETOOLONG, syscall.ENAMETOOLONG) + ErrNoLocksAvailable = newWithHost("no record locks available", linux.ENOLCK, syscall.ENOLCK) + ErrInvalidSyscall = newWithHost("invalid system call number", linux.ENOSYS, syscall.ENOSYS) + ErrDirNotEmpty = newWithHost("directory not empty", linux.ENOTEMPTY, syscall.ENOTEMPTY) + ErrLinkLoop = newWithHost("too many symbolic links encountered", linux.ELOOP, syscall.ELOOP) + ErrNoMessage = newWithHost("no message of desired type", linux.ENOMSG, syscall.ENOMSG) + ErrIdentifierRemoved = newWithHost("identifier removed", linux.EIDRM, syscall.EIDRM) + ErrChannelOutOfRange = newWithHost("channel number out of range", linux.ECHRNG, syscall.ECHRNG) + ErrLevelTwoNotSynced = newWithHost("level 2 not synchronized", linux.EL2NSYNC, syscall.EL2NSYNC) + ErrLevelThreeHalted = newWithHost("level 3 halted", linux.EL3HLT, syscall.EL3HLT) + ErrLevelThreeReset = newWithHost("level 3 reset", linux.EL3RST, syscall.EL3RST) + ErrLinkNumberOutOfRange = newWithHost("link number out of range", linux.ELNRNG, syscall.ELNRNG) + ErrProtocolDriverNotAttached = newWithHost("protocol driver not attached", linux.EUNATCH, syscall.EUNATCH) + ErrNoCSIAvailable = newWithHost("no CSI structure available", linux.ENOCSI, syscall.ENOCSI) + ErrLevelTwoHalted = newWithHost("level 2 halted", linux.EL2HLT, syscall.EL2HLT) + ErrInvalidExchange = newWithHost("invalid exchange", linux.EBADE, syscall.EBADE) + ErrInvalidRequestDescriptor = newWithHost("invalid request descriptor", linux.EBADR, syscall.EBADR) + ErrExchangeFull = newWithHost("exchange full", linux.EXFULL, syscall.EXFULL) + ErrNoAnode = newWithHost("no anode", linux.ENOANO, syscall.ENOANO) + ErrInvalidRequestCode = newWithHost("invalid request code", linux.EBADRQC, syscall.EBADRQC) + ErrInvalidSlot = newWithHost("invalid slot", linux.EBADSLT, syscall.EBADSLT) + ErrBadFontFile = newWithHost("bad font file format", linux.EBFONT, syscall.EBFONT) + ErrNotStream = newWithHost("device not a stream", linux.ENOSTR, syscall.ENOSTR) + ErrNoDataAvailable = newWithHost("no data available", linux.ENODATA, syscall.ENODATA) + ErrTimerExpired = newWithHost("timer expired", linux.ETIME, syscall.ETIME) + ErrStreamsResourceDepleted = newWithHost("out of streams resources", linux.ENOSR, syscall.ENOSR) + ErrMachineNotOnNetwork = newWithHost("machine is not on the network", linux.ENONET, syscall.ENONET) + ErrPackageNotInstalled = newWithHost("package not installed", linux.ENOPKG, syscall.ENOPKG) + ErrIsRemote = newWithHost("object is remote", linux.EREMOTE, syscall.EREMOTE) + ErrNoLink = newWithHost("link has been severed", linux.ENOLINK, syscall.ENOLINK) + ErrAdvertise = newWithHost("advertise error", linux.EADV, syscall.EADV) + ErrSRMount = newWithHost("srmount error", linux.ESRMNT, syscall.ESRMNT) + ErrSendCommunication = newWithHost("communication error on send", linux.ECOMM, syscall.ECOMM) + ErrProtocol = newWithHost("protocol error", linux.EPROTO, syscall.EPROTO) + ErrMultihopAttempted = newWithHost("multihop attempted", linux.EMULTIHOP, syscall.EMULTIHOP) + ErrRFS = newWithHost("RFS specific error", linux.EDOTDOT, syscall.EDOTDOT) + ErrInvalidDataMessage = newWithHost("not a data message", linux.EBADMSG, syscall.EBADMSG) + ErrOverflow = newWithHost("value too large for defined data type", linux.EOVERFLOW, syscall.EOVERFLOW) + ErrNetworkNameNotUnique = newWithHost("name not unique on network", linux.ENOTUNIQ, syscall.ENOTUNIQ) + ErrFDInBadState = newWithHost("file descriptor in bad state", linux.EBADFD, syscall.EBADFD) + ErrRemoteAddressChanged = newWithHost("remote address changed", linux.EREMCHG, syscall.EREMCHG) + ErrSharedLibraryInaccessible = newWithHost("can not access a needed shared library", linux.ELIBACC, syscall.ELIBACC) + ErrCorruptedSharedLibrary = newWithHost("accessing a corrupted shared library", linux.ELIBBAD, syscall.ELIBBAD) + ErrLibSectionCorrupted = newWithHost(".lib section in a.out corrupted", linux.ELIBSCN, syscall.ELIBSCN) + ErrTooManySharedLibraries = newWithHost("attempting to link in too many shared libraries", linux.ELIBMAX, syscall.ELIBMAX) + ErrSharedLibraryExeced = newWithHost("cannot exec a shared library directly", linux.ELIBEXEC, syscall.ELIBEXEC) + ErrIllegalByteSequence = newWithHost("illegal byte sequence", linux.EILSEQ, syscall.EILSEQ) + ErrShouldRestart = newWithHost("interrupted system call should be restarted", linux.ERESTART, syscall.ERESTART) + ErrStreamPipe = newWithHost("streams pipe error", linux.ESTRPIPE, syscall.ESTRPIPE) + ErrTooManyUsers = newWithHost("too many users", linux.EUSERS, syscall.EUSERS) + ErrNotASocket = newWithHost("socket operation on non-socket", linux.ENOTSOCK, syscall.ENOTSOCK) + ErrDestinationAddressRequired = newWithHost("destination address required", linux.EDESTADDRREQ, syscall.EDESTADDRREQ) + ErrMessageTooLong = newWithHost("message too long", linux.EMSGSIZE, syscall.EMSGSIZE) + ErrWrongProtocolForSocket = newWithHost("protocol wrong type for socket", linux.EPROTOTYPE, syscall.EPROTOTYPE) + ErrProtocolNotAvailable = newWithHost("protocol not available", linux.ENOPROTOOPT, syscall.ENOPROTOOPT) + ErrProtocolNotSupported = newWithHost("protocol not supported", linux.EPROTONOSUPPORT, syscall.EPROTONOSUPPORT) + ErrSocketNotSupported = newWithHost("socket type not supported", linux.ESOCKTNOSUPPORT, syscall.ESOCKTNOSUPPORT) + ErrEndpointOperation = newWithHost("operation not supported on transport endpoint", linux.EOPNOTSUPP, syscall.EOPNOTSUPP) + ErrProtocolFamilyNotSupported = newWithHost("protocol family not supported", linux.EPFNOSUPPORT, syscall.EPFNOSUPPORT) + ErrAddressFamilyNotSupported = newWithHost("address family not supported by protocol", linux.EAFNOSUPPORT, syscall.EAFNOSUPPORT) + ErrAddressInUse = newWithHost("address already in use", linux.EADDRINUSE, syscall.EADDRINUSE) + ErrAddressNotAvailable = newWithHost("cannot assign requested address", linux.EADDRNOTAVAIL, syscall.EADDRNOTAVAIL) + ErrNetworkDown = newWithHost("network is down", linux.ENETDOWN, syscall.ENETDOWN) + ErrNetworkUnreachable = newWithHost("network is unreachable", linux.ENETUNREACH, syscall.ENETUNREACH) + ErrNetworkReset = newWithHost("network dropped connection because of reset", linux.ENETRESET, syscall.ENETRESET) + ErrConnectionAborted = newWithHost("software caused connection abort", linux.ECONNABORTED, syscall.ECONNABORTED) + ErrConnectionReset = newWithHost("connection reset by peer", linux.ECONNRESET, syscall.ECONNRESET) + ErrNoBufferSpace = newWithHost("no buffer space available", linux.ENOBUFS, syscall.ENOBUFS) + ErrAlreadyConnected = newWithHost("transport endpoint is already connected", linux.EISCONN, syscall.EISCONN) + ErrNotConnected = newWithHost("transport endpoint is not connected", linux.ENOTCONN, syscall.ENOTCONN) + ErrShutdown = newWithHost("cannot send after transport endpoint shutdown", linux.ESHUTDOWN, syscall.ESHUTDOWN) + ErrTooManyRefs = newWithHost("too many references: cannot splice", linux.ETOOMANYREFS, syscall.ETOOMANYREFS) + ErrTimedOut = newWithHost("connection timed out", linux.ETIMEDOUT, syscall.ETIMEDOUT) + ErrConnectionRefused = newWithHost("connection refused", linux.ECONNREFUSED, syscall.ECONNREFUSED) + ErrHostDown = newWithHost("host is down", linux.EHOSTDOWN, syscall.EHOSTDOWN) + ErrNoRoute = newWithHost("no route to host", linux.EHOSTUNREACH, syscall.EHOSTUNREACH) + ErrAlreadyInProgress = newWithHost("operation already in progress", linux.EALREADY, syscall.EALREADY) + ErrInProgress = newWithHost("operation now in progress", linux.EINPROGRESS, syscall.EINPROGRESS) + ErrStaleFileHandle = newWithHost("stale file handle", linux.ESTALE, syscall.ESTALE) + ErrStructureNeedsCleaning = newWithHost("structure needs cleaning", linux.EUCLEAN, syscall.EUCLEAN) + ErrIsNamedFile = newWithHost("is a named type file", linux.ENOTNAM, syscall.ENOTNAM) + ErrRemoteIO = newWithHost("remote I/O error", linux.EREMOTEIO, syscall.EREMOTEIO) + ErrQuotaExceeded = newWithHost("quota exceeded", linux.EDQUOT, syscall.EDQUOT) + ErrNoMedium = newWithHost("no medium found", linux.ENOMEDIUM, syscall.ENOMEDIUM) + ErrWrongMediumType = newWithHost("wrong medium type", linux.EMEDIUMTYPE, syscall.EMEDIUMTYPE) + ErrCanceled = newWithHost("operation canceled", linux.ECANCELED, syscall.ECANCELED) + ErrNoKey = newWithHost("required key not available", linux.ENOKEY, syscall.ENOKEY) + ErrKeyExpired = newWithHost("key has expired", linux.EKEYEXPIRED, syscall.EKEYEXPIRED) + ErrKeyRevoked = newWithHost("key has been revoked", linux.EKEYREVOKED, syscall.EKEYREVOKED) + ErrKeyRejected = newWithHost("key was rejected by service", linux.EKEYREJECTED, syscall.EKEYREJECTED) + ErrOwnerDied = newWithHost("owner died", linux.EOWNERDEAD, syscall.EOWNERDEAD) + ErrNotRecoverable = newWithHost("state not recoverable", linux.ENOTRECOVERABLE, syscall.ENOTRECOVERABLE) + + // ErrWouldBlock translates to EWOULDBLOCK which is the same as EAGAIN + // on Linux. + ErrWouldBlock = New("operation would block", linux.EWOULDBLOCK) +) + +// FromError converts a generic error to an *Error. +// +// TODO(b/34162363): Remove this function. +func FromError(err error) *Error { + if err == nil { + return nil + } + if errno, ok := err.(syscall.Errno); ok { + return FromHost(errno) + } + if errno, ok := syserror.TranslateError(err); ok { + return FromHost(errno) + } + panic("unknown error: " + err.Error()) +} |