diff options
Diffstat (limited to 'vendor/golang.org/x/sys/unix/syscall_linux.go')
| -rw-r--r-- | vendor/golang.org/x/sys/unix/syscall_linux.go | 819 |
1 files changed, 724 insertions, 95 deletions
diff --git a/vendor/golang.org/x/sys/unix/syscall_linux.go b/vendor/golang.org/x/sys/unix/syscall_linux.go index 7e429ab..41b91fd 100644 --- a/vendor/golang.org/x/sys/unix/syscall_linux.go +++ b/vendor/golang.org/x/sys/unix/syscall_linux.go @@ -13,7 +13,6 @@ package unix import ( "encoding/binary" - "net" "runtime" "syscall" "unsafe" @@ -71,61 +70,7 @@ func Fchmodat(dirfd int, path string, mode uint32, flags int) (err error) { // ioctl itself should not be exposed directly, but additional get/set // functions for specific types are permissible. - -// IoctlSetPointerInt performs an ioctl operation which sets an -// integer value on fd, using the specified request number. The ioctl -// argument is called with a pointer to the integer value, rather than -// passing the integer value directly. -func IoctlSetPointerInt(fd int, req uint, value int) error { - v := int32(value) - return ioctl(fd, req, uintptr(unsafe.Pointer(&v))) -} - -// IoctlSetInt performs an ioctl operation which sets an integer value -// on fd, using the specified request number. -func IoctlSetInt(fd int, req uint, value int) error { - return ioctl(fd, req, uintptr(value)) -} - -func ioctlSetWinsize(fd int, req uint, value *Winsize) error { - return ioctl(fd, req, uintptr(unsafe.Pointer(value))) -} - -func ioctlSetTermios(fd int, req uint, value *Termios) error { - return ioctl(fd, req, uintptr(unsafe.Pointer(value))) -} - -func IoctlSetRTCTime(fd int, value *RTCTime) error { - err := ioctl(fd, RTC_SET_TIME, uintptr(unsafe.Pointer(value))) - runtime.KeepAlive(value) - return err -} - -// IoctlGetInt performs an ioctl operation which gets an integer value -// from fd, using the specified request number. -func IoctlGetInt(fd int, req uint) (int, error) { - var value int - err := ioctl(fd, req, uintptr(unsafe.Pointer(&value))) - return value, err -} - -func IoctlGetWinsize(fd int, req uint) (*Winsize, error) { - var value Winsize - err := ioctl(fd, req, uintptr(unsafe.Pointer(&value))) - return &value, err -} - -func IoctlGetTermios(fd int, req uint) (*Termios, error) { - var value Termios - err := ioctl(fd, req, uintptr(unsafe.Pointer(&value))) - return &value, err -} - -func IoctlGetRTCTime(fd int) (*RTCTime, error) { - var value RTCTime - err := ioctl(fd, RTC_RD_TIME, uintptr(unsafe.Pointer(&value))) - return &value, err -} +// These are defined in ioctl.go and ioctl_linux.go. //sys Linkat(olddirfd int, oldpath string, newdirfd int, newpath string, flags int) (err error) @@ -151,6 +96,12 @@ func Openat(dirfd int, path string, flags int, mode uint32) (fd int, err error) return openat(dirfd, path, flags|O_LARGEFILE, mode) } +//sys openat2(dirfd int, path string, open_how *OpenHow, size int) (fd int, err error) + +func Openat2(dirfd int, path string, how *OpenHow) (fd int, err error) { + return openat2(dirfd, path, how, SizeofOpenHow) +} + //sys ppoll(fds *PollFd, nfds int, timeout *Timespec, sigmask *Sigset_t) (n int, err error) func Ppoll(fds []PollFd, timeout *Timespec, sigmask *Sigset_t) (n int, err error) { @@ -609,6 +560,36 @@ func (sa *SockaddrCAN) sockaddr() (unsafe.Pointer, _Socklen, error) { return unsafe.Pointer(&sa.raw), SizeofSockaddrCAN, nil } +// SockaddrCANJ1939 implements the Sockaddr interface for AF_CAN using J1939 +// protocol (https://en.wikipedia.org/wiki/SAE_J1939). For more information +// on the purposes of the fields, check the official linux kernel documentation +// available here: https://www.kernel.org/doc/Documentation/networking/j1939.rst +type SockaddrCANJ1939 struct { + Ifindex int + Name uint64 + PGN uint32 + Addr uint8 + raw RawSockaddrCAN +} + +func (sa *SockaddrCANJ1939) sockaddr() (unsafe.Pointer, _Socklen, error) { + if sa.Ifindex < 0 || sa.Ifindex > 0x7fffffff { + return nil, 0, EINVAL + } + sa.raw.Family = AF_CAN + sa.raw.Ifindex = int32(sa.Ifindex) + n := (*[8]byte)(unsafe.Pointer(&sa.Name)) + for i := 0; i < 8; i++ { + sa.raw.Addr[i] = n[i] + } + p := (*[4]byte)(unsafe.Pointer(&sa.PGN)) + for i := 0; i < 4; i++ { + sa.raw.Addr[i+8] = p[i] + } + sa.raw.Addr[12] = sa.Addr + return unsafe.Pointer(&sa.raw), SizeofSockaddrCAN, nil +} + // SockaddrALG implements the Sockaddr interface for AF_ALG type sockets. // SockaddrALG enables userspace access to the Linux kernel's cryptography // subsystem. The Type and Name fields specify which type of hash or cipher @@ -716,16 +697,19 @@ type SockaddrVM struct { // CID and Port specify a context ID and port address for a VM socket. // Guests have a unique CID, and hosts may have a well-known CID of: // - VMADDR_CID_HYPERVISOR: refers to the hypervisor process. + // - VMADDR_CID_LOCAL: refers to local communication (loopback). // - VMADDR_CID_HOST: refers to other processes on the host. - CID uint32 - Port uint32 - raw RawSockaddrVM + CID uint32 + Port uint32 + Flags uint8 + raw RawSockaddrVM } func (sa *SockaddrVM) sockaddr() (unsafe.Pointer, _Socklen, error) { sa.raw.Family = AF_VSOCK sa.raw.Port = sa.Port sa.raw.Cid = sa.CID + sa.raw.Flags = sa.Flags return unsafe.Pointer(&sa.raw), SizeofSockaddrVM, nil } @@ -759,7 +743,7 @@ const px_proto_oe = 0 type SockaddrPPPoE struct { SID uint16 - Remote net.HardwareAddr + Remote []byte Dev string raw RawSockaddrPPPoX } @@ -793,6 +777,177 @@ func (sa *SockaddrPPPoE) sockaddr() (unsafe.Pointer, _Socklen, error) { return unsafe.Pointer(&sa.raw), SizeofSockaddrPPPoX, nil } +// SockaddrTIPC implements the Sockaddr interface for AF_TIPC type sockets. +// For more information on TIPC, see: http://tipc.sourceforge.net/. +type SockaddrTIPC struct { + // Scope is the publication scopes when binding service/service range. + // Should be set to TIPC_CLUSTER_SCOPE or TIPC_NODE_SCOPE. + Scope int + + // Addr is the type of address used to manipulate a socket. Addr must be + // one of: + // - *TIPCSocketAddr: "id" variant in the C addr union + // - *TIPCServiceRange: "nameseq" variant in the C addr union + // - *TIPCServiceName: "name" variant in the C addr union + // + // If nil, EINVAL will be returned when the structure is used. + Addr TIPCAddr + + raw RawSockaddrTIPC +} + +// TIPCAddr is implemented by types that can be used as an address for +// SockaddrTIPC. It is only implemented by *TIPCSocketAddr, *TIPCServiceRange, +// and *TIPCServiceName. +type TIPCAddr interface { + tipcAddrtype() uint8 + tipcAddr() [12]byte +} + +func (sa *TIPCSocketAddr) tipcAddr() [12]byte { + var out [12]byte + copy(out[:], (*(*[unsafe.Sizeof(TIPCSocketAddr{})]byte)(unsafe.Pointer(sa)))[:]) + return out +} + +func (sa *TIPCSocketAddr) tipcAddrtype() uint8 { return TIPC_SOCKET_ADDR } + +func (sa *TIPCServiceRange) tipcAddr() [12]byte { + var out [12]byte + copy(out[:], (*(*[unsafe.Sizeof(TIPCServiceRange{})]byte)(unsafe.Pointer(sa)))[:]) + return out +} + +func (sa *TIPCServiceRange) tipcAddrtype() uint8 { return TIPC_SERVICE_RANGE } + +func (sa *TIPCServiceName) tipcAddr() [12]byte { + var out [12]byte + copy(out[:], (*(*[unsafe.Sizeof(TIPCServiceName{})]byte)(unsafe.Pointer(sa)))[:]) + return out +} + +func (sa *TIPCServiceName) tipcAddrtype() uint8 { return TIPC_SERVICE_ADDR } + +func (sa *SockaddrTIPC) sockaddr() (unsafe.Pointer, _Socklen, error) { + if sa.Addr == nil { + return nil, 0, EINVAL + } + + sa.raw.Family = AF_TIPC + sa.raw.Scope = int8(sa.Scope) + sa.raw.Addrtype = sa.Addr.tipcAddrtype() + sa.raw.Addr = sa.Addr.tipcAddr() + + return unsafe.Pointer(&sa.raw), SizeofSockaddrTIPC, nil +} + +// SockaddrL2TPIP implements the Sockaddr interface for IPPROTO_L2TP/AF_INET sockets. +type SockaddrL2TPIP struct { + Addr [4]byte + ConnId uint32 + raw RawSockaddrL2TPIP +} + +func (sa *SockaddrL2TPIP) sockaddr() (unsafe.Pointer, _Socklen, error) { + sa.raw.Family = AF_INET + sa.raw.Conn_id = sa.ConnId + for i := 0; i < len(sa.Addr); i++ { + sa.raw.Addr[i] = sa.Addr[i] + } + return unsafe.Pointer(&sa.raw), SizeofSockaddrL2TPIP, nil +} + +// SockaddrL2TPIP6 implements the Sockaddr interface for IPPROTO_L2TP/AF_INET6 sockets. +type SockaddrL2TPIP6 struct { + Addr [16]byte + ZoneId uint32 + ConnId uint32 + raw RawSockaddrL2TPIP6 +} + +func (sa *SockaddrL2TPIP6) sockaddr() (unsafe.Pointer, _Socklen, error) { + sa.raw.Family = AF_INET6 + sa.raw.Conn_id = sa.ConnId + sa.raw.Scope_id = sa.ZoneId + for i := 0; i < len(sa.Addr); i++ { + sa.raw.Addr[i] = sa.Addr[i] + } + return unsafe.Pointer(&sa.raw), SizeofSockaddrL2TPIP6, nil +} + +// SockaddrIUCV implements the Sockaddr interface for AF_IUCV sockets. +type SockaddrIUCV struct { + UserID string + Name string + raw RawSockaddrIUCV +} + +func (sa *SockaddrIUCV) sockaddr() (unsafe.Pointer, _Socklen, error) { + sa.raw.Family = AF_IUCV + // These are EBCDIC encoded by the kernel, but we still need to pad them + // with blanks. Initializing with blanks allows the caller to feed in either + // a padded or an unpadded string. + for i := 0; i < 8; i++ { + sa.raw.Nodeid[i] = ' ' + sa.raw.User_id[i] = ' ' + sa.raw.Name[i] = ' ' + } + if len(sa.UserID) > 8 || len(sa.Name) > 8 { + return nil, 0, EINVAL + } + for i, b := range []byte(sa.UserID[:]) { + sa.raw.User_id[i] = int8(b) + } + for i, b := range []byte(sa.Name[:]) { + sa.raw.Name[i] = int8(b) + } + return unsafe.Pointer(&sa.raw), SizeofSockaddrIUCV, nil +} + +type SockaddrNFC struct { + DeviceIdx uint32 + TargetIdx uint32 + NFCProtocol uint32 + raw RawSockaddrNFC +} + +func (sa *SockaddrNFC) sockaddr() (unsafe.Pointer, _Socklen, error) { + sa.raw.Sa_family = AF_NFC + sa.raw.Dev_idx = sa.DeviceIdx + sa.raw.Target_idx = sa.TargetIdx + sa.raw.Nfc_protocol = sa.NFCProtocol + return unsafe.Pointer(&sa.raw), SizeofSockaddrNFC, nil +} + +type SockaddrNFCLLCP struct { + DeviceIdx uint32 + TargetIdx uint32 + NFCProtocol uint32 + DestinationSAP uint8 + SourceSAP uint8 + ServiceName string + raw RawSockaddrNFCLLCP +} + +func (sa *SockaddrNFCLLCP) sockaddr() (unsafe.Pointer, _Socklen, error) { + sa.raw.Sa_family = AF_NFC + sa.raw.Dev_idx = sa.DeviceIdx + sa.raw.Target_idx = sa.TargetIdx + sa.raw.Nfc_protocol = sa.NFCProtocol + sa.raw.Dsap = sa.DestinationSAP + sa.raw.Ssap = sa.SourceSAP + if len(sa.ServiceName) > len(sa.raw.Service_name) { + return nil, 0, EINVAL + } + copy(sa.raw.Service_name[:], sa.ServiceName) + sa.raw.SetServiceNameLen(len(sa.ServiceName)) + return unsafe.Pointer(&sa.raw), SizeofSockaddrNFCLLCP, nil +} + +var socketProtocol = func(fd int) (int, error) { + return GetsockoptInt(fd, SOL_SOCKET, SO_PROTOCOL) +} + func anyToSockaddr(fd int, rsa *RawSockaddrAny) (Sockaddr, error) { switch rsa.Addr.Family { case AF_NETLINK: @@ -838,40 +993,74 @@ func anyToSockaddr(fd int, rsa *RawSockaddrAny) (Sockaddr, error) { for n < len(pp.Path) && pp.Path[n] != 0 { n++ } - bytes := (*[10000]byte)(unsafe.Pointer(&pp.Path[0]))[0:n] + bytes := (*[len(pp.Path)]byte)(unsafe.Pointer(&pp.Path[0]))[0:n] sa.Name = string(bytes) return sa, nil case AF_INET: - pp := (*RawSockaddrInet4)(unsafe.Pointer(rsa)) - sa := new(SockaddrInet4) - p := (*[2]byte)(unsafe.Pointer(&pp.Port)) - sa.Port = int(p[0])<<8 + int(p[1]) - for i := 0; i < len(sa.Addr); i++ { - sa.Addr[i] = pp.Addr[i] + proto, err := socketProtocol(fd) + if err != nil { + return nil, err + } + + switch proto { + case IPPROTO_L2TP: + pp := (*RawSockaddrL2TPIP)(unsafe.Pointer(rsa)) + sa := new(SockaddrL2TPIP) + sa.ConnId = pp.Conn_id + for i := 0; i < len(sa.Addr); i++ { + sa.Addr[i] = pp.Addr[i] + } + return sa, nil + default: + pp := (*RawSockaddrInet4)(unsafe.Pointer(rsa)) + sa := new(SockaddrInet4) + p := (*[2]byte)(unsafe.Pointer(&pp.Port)) + sa.Port = int(p[0])<<8 + int(p[1]) + for i := 0; i < len(sa.Addr); i++ { + sa.Addr[i] = pp.Addr[i] + } + return sa, nil } - return sa, nil case AF_INET6: - pp := (*RawSockaddrInet6)(unsafe.Pointer(rsa)) - sa := new(SockaddrInet6) - p := (*[2]byte)(unsafe.Pointer(&pp.Port)) - sa.Port = int(p[0])<<8 + int(p[1]) - sa.ZoneId = pp.Scope_id - for i := 0; i < len(sa.Addr); i++ { - sa.Addr[i] = pp.Addr[i] + proto, err := socketProtocol(fd) + if err != nil { + return nil, err + } + + switch proto { + case IPPROTO_L2TP: + pp := (*RawSockaddrL2TPIP6)(unsafe.Pointer(rsa)) + sa := new(SockaddrL2TPIP6) + sa.ConnId = pp.Conn_id + sa.ZoneId = pp.Scope_id + for i := 0; i < len(sa.Addr); i++ { + sa.Addr[i] = pp.Addr[i] + } + return sa, nil + default: + pp := (*RawSockaddrInet6)(unsafe.Pointer(rsa)) + sa := new(SockaddrInet6) + p := (*[2]byte)(unsafe.Pointer(&pp.Port)) + sa.Port = int(p[0])<<8 + int(p[1]) + sa.ZoneId = pp.Scope_id + for i := 0; i < len(sa.Addr); i++ { + sa.Addr[i] = pp.Addr[i] + } + return sa, nil } - return sa, nil case AF_VSOCK: pp := (*RawSockaddrVM)(unsafe.Pointer(rsa)) sa := &SockaddrVM{ - CID: pp.Cid, - Port: pp.Port, + CID: pp.Cid, + Port: pp.Port, + Flags: pp.Flags, } return sa, nil case AF_BLUETOOTH: - proto, err := GetsockoptInt(fd, SOL_SOCKET, SO_PROTOCOL) + proto, err := socketProtocol(fd) if err != nil { return nil, err } @@ -910,7 +1099,7 @@ func anyToSockaddr(fd int, rsa *RawSockaddrAny) (Sockaddr, error) { } sa := &SockaddrPPPoE{ SID: binary.BigEndian.Uint16(pp[6:8]), - Remote: net.HardwareAddr(pp[8:14]), + Remote: pp[8:14], } for i := 14; i < 14+IFNAMSIZ; i++ { if pp[i] == 0 { @@ -919,6 +1108,113 @@ func anyToSockaddr(fd int, rsa *RawSockaddrAny) (Sockaddr, error) { } } return sa, nil + case AF_TIPC: + pp := (*RawSockaddrTIPC)(unsafe.Pointer(rsa)) + + sa := &SockaddrTIPC{ + Scope: int(pp.Scope), + } + + // Determine which union variant is present in pp.Addr by checking + // pp.Addrtype. + switch pp.Addrtype { + case TIPC_SERVICE_RANGE: + sa.Addr = (*TIPCServiceRange)(unsafe.Pointer(&pp.Addr)) + case TIPC_SERVICE_ADDR: + sa.Addr = (*TIPCServiceName)(unsafe.Pointer(&pp.Addr)) + case TIPC_SOCKET_ADDR: + sa.Addr = (*TIPCSocketAddr)(unsafe.Pointer(&pp.Addr)) + default: + return nil, EINVAL + } + + return sa, nil + case AF_IUCV: + pp := (*RawSockaddrIUCV)(unsafe.Pointer(rsa)) + + var user [8]byte + var name [8]byte + + for i := 0; i < 8; i++ { + user[i] = byte(pp.User_id[i]) + name[i] = byte(pp.Name[i]) + } + + sa := &SockaddrIUCV{ + UserID: string(user[:]), + Name: string(name[:]), + } + return sa, nil + + case AF_CAN: + proto, err := socketProtocol(fd) + if err != nil { + return nil, err + } + + pp := (*RawSockaddrCAN)(unsafe.Pointer(rsa)) + + switch proto { + case CAN_J1939: + sa := &SockaddrCANJ1939{ + Ifindex: int(pp.Ifindex), + } + name := (*[8]byte)(unsafe.Pointer(&sa.Name)) + for i := 0; i < 8; i++ { + name[i] = pp.Addr[i] + } + pgn := (*[4]byte)(unsafe.Pointer(&sa.PGN)) + for i := 0; i < 4; i++ { + pgn[i] = pp.Addr[i+8] + } + addr := (*[1]byte)(unsafe.Pointer(&sa.Addr)) + addr[0] = pp.Addr[12] + return sa, nil + default: + sa := &SockaddrCAN{ + Ifindex: int(pp.Ifindex), + } + rx := (*[4]byte)(unsafe.Pointer(&sa.RxID)) + for i := 0; i < 4; i++ { + rx[i] = pp.Addr[i] + } + tx := (*[4]byte)(unsafe.Pointer(&sa.TxID)) + for i := 0; i < 4; i++ { + tx[i] = pp.Addr[i+4] + } + return sa, nil + } + case AF_NFC: + proto, err := socketProtocol(fd) + if err != nil { + return nil, err + } + switch proto { + case NFC_SOCKPROTO_RAW: + pp := (*RawSockaddrNFC)(unsafe.Pointer(rsa)) + sa := &SockaddrNFC{ + DeviceIdx: pp.Dev_idx, + TargetIdx: pp.Target_idx, + NFCProtocol: pp.Nfc_protocol, + } + return sa, nil + case NFC_SOCKPROTO_LLCP: + pp := (*RawSockaddrNFCLLCP)(unsafe.Pointer(rsa)) + if uint64(pp.Service_name_len) > uint64(len(pp.Service_name)) { + return nil, EINVAL + } + sa := &SockaddrNFCLLCP{ + DeviceIdx: pp.Dev_idx, + TargetIdx: pp.Target_idx, + NFCProtocol: pp.Nfc_protocol, + DestinationSAP: pp.Dsap, + SourceSAP: pp.Ssap, + ServiceName: string(pp.Service_name[:pp.Service_name_len]), + } + return sa, nil + default: + return nil, EINVAL + } } return nil, EAFNOSUPPORT } @@ -926,7 +1222,11 @@ func anyToSockaddr(fd int, rsa *RawSockaddrAny) (Sockaddr, error) { func Accept(fd int) (nfd int, sa Sockaddr, err error) { var rsa RawSockaddrAny var len _Socklen = SizeofSockaddrAny - nfd, err = accept(fd, &rsa, &len) + // Try accept4 first for Android, then try accept for kernel older than 2.6.28 + nfd, err = accept4(fd, &rsa, &len, 0) + if err == ENOSYS { + nfd, err = accept(fd, &rsa, &len) + } if err != nil { return } @@ -1155,6 +1455,34 @@ func KeyctlDHCompute(params *KeyctlDHParams, buffer []byte) (size int, err error return keyctlDH(KEYCTL_DH_COMPUTE, params, buffer) } +// KeyctlRestrictKeyring implements the KEYCTL_RESTRICT_KEYRING command. This +// command limits the set of keys that can be linked to the keyring, regardless +// of keyring permissions. The command requires the "setattr" permission. +// +// When called with an empty keyType the command locks the keyring, preventing +// any further keys from being linked to the keyring. +// +// The "asymmetric" keyType defines restrictions requiring key payloads to be +// DER encoded X.509 certificates signed by keys in another keyring. Restrictions +// for "asymmetric" include "builtin_trusted", "builtin_and_secondary_trusted", +// "key_or_keyring:<key>", and "key_or_keyring:<key>:chain". +// +// As of Linux 4.12, only the "asymmetric" keyType defines type-specific +// restrictions. +// +// See the full documentation at: +// http://man7.org/linux/man-pages/man3/keyctl_restrict_keyring.3.html +// http://man7.org/linux/man-pages/man2/keyctl.2.html +func KeyctlRestrictKeyring(ringid int, keyType string, restriction string) error { + if keyType == "" { + return keyctlRestrictKeyring(KEYCTL_RESTRICT_KEYRING, ringid) + } + return keyctlRestrictKeyringByType(KEYCTL_RESTRICT_KEYRING, ringid, keyType, restriction) +} + +//sys keyctlRestrictKeyringByType(cmd int, arg2 int, keyType string, restriction string) (err error) = SYS_KEYCTL +//sys keyctlRestrictKeyring(cmd int, arg2 int) (err error) = SYS_KEYCTL + func Recvmsg(fd int, p, oob []byte, flags int) (n, oobn int, recvflags int, from Sockaddr, err error) { var msg Msghdr var rsa RawSockaddrAny @@ -1398,8 +1726,12 @@ func PtraceSyscall(pid int, signal int) (err error) { func PtraceSingleStep(pid int) (err error) { return ptrace(PTRACE_SINGLESTEP, pid, 0, 0) } +func PtraceInterrupt(pid int) (err error) { return ptrace(PTRACE_INTERRUPT, pid, 0, 0) } + func PtraceAttach(pid int) (err error) { return ptrace(PTRACE_ATTACH, pid, 0, 0) } +func PtraceSeize(pid int) (err error) { return ptrace(PTRACE_SEIZE, pid, 0, 0) } + func PtraceDetach(pid int) (err error) { return ptrace(PTRACE_DETACH, pid, 0, 0) } //sys reboot(magic1 uint, magic2 uint, cmd int, arg string) (err error) @@ -1408,8 +1740,20 @@ func Reboot(cmd int) (err error) { return reboot(LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2, cmd, "") } -func ReadDirent(fd int, buf []byte) (n int, err error) { - return Getdents(fd, buf) +func direntIno(buf []byte) (uint64, bool) { + return readInt(buf, unsafe.Offsetof(Dirent{}.Ino), unsafe.Sizeof(Dirent{}.Ino)) +} + +func direntReclen(buf []byte) (uint64, bool) { + return readInt(buf, unsafe.Offsetof(Dirent{}.Reclen), unsafe.Sizeof(Dirent{}.Reclen)) +} + +func direntNamlen(buf []byte) (uint64, bool) { + reclen, ok := direntReclen(buf) + if !ok { + return 0, false + } + return reclen - uint64(unsafe.Offsetof(Dirent{}.Name)), true } //sys mount(source string, target string, fstype string, flags uintptr, data *byte) (err error) @@ -1444,15 +1788,27 @@ func Sendfile(outfd int, infd int, offset *int64, count int) (written int, err e //sys Acct(path string) (err error) //sys AddKey(keyType string, description string, payload []byte, ringid int) (id int, err error) //sys Adjtimex(buf *Timex) (state int, err error) +//sysnb Capget(hdr *CapUserHeader, data *CapUserData) (err error) +//sysnb Capset(hdr *CapUserHeader, data *CapUserData) (err error) //sys Chdir(path string) (err error) //sys Chroot(path string) (err error) //sys ClockGetres(clockid int32, res *Timespec) (err error) //sys ClockGettime(clockid int32, time *Timespec) (err error) //sys ClockNanosleep(clockid int32, flags int, request *Timespec, remain *Timespec) (err error) //sys Close(fd int) (err error) +//sys CloseRange(first uint, last uint, flags uint) (err error) //sys CopyFileRange(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int, err error) //sys DeleteModule(name string, flags int) (err error) //sys Dup(oldfd int) (fd int, err error) + +func Dup2(oldfd, newfd int) error { + // Android O and newer blocks dup2; riscv and arm64 don't implement dup2. + if runtime.GOOS == "android" || runtime.GOARCH == "riscv64" || runtime.GOARCH == "arm64" { + return Dup3(oldfd, newfd, 0) + } + return dup2(oldfd, newfd) +} + //sys Dup3(oldfd int, newfd int, flags int) (err error) //sysnb EpollCreate1(flag int) (fd int, err error) //sysnb EpollCtl(epfd int, op int, fd int, event *EpollEvent) (err error) @@ -1462,7 +1818,6 @@ func Sendfile(outfd int, infd int, offset *int64, count int) (written int, err e //sys Fchdir(fd int) (err error) //sys Fchmod(fd int, mode uint32) (err error) //sys Fchownat(dirfd int, path string, uid int, gid int, flags int) (err error) -//sys fcntl(fd int, cmd int, arg int) (val int, err error) //sys Fdatasync(fd int) (err error) //sys Fgetxattr(fd int, attr string, dest []byte) (sz int, err error) //sys FinitModule(fd int, params string, flags int) (err error) @@ -1504,8 +1859,8 @@ func Getpgrp() (pid int) { //sys Nanosleep(time *Timespec, leftover *Timespec) (err error) //sys PerfEventOpen(attr *PerfEventAttr, pid int, cpu int, groupFd int, flags int) (fd int, err error) //sys PivotRoot(newroot string, putold string) (err error) = SYS_PIVOT_ROOT -//sysnb prlimit(pid int, resource int, newlimit *Rlimit, old *Rlimit) (err error) = SYS_PRLIMIT64 -//sys Prctl(option int, arg2 uintptr, arg3 uintptr, arg4 uintptr, arg5 uintptr) (err error) +//sysnb prlimit(pid int, resource int, newlimit *Rlimit, old *Rlimit) (err error) = SYS_PRLIMIT64 +//sys Prctl(option int, arg2 uintptr, arg3 uintptr, arg4 uintptr, arg5 uintptr) (err error) //sys Pselect(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timespec, sigmask *Sigset_t) (n int, err error) = SYS_PSELECT6 //sys read(fd int, p []byte) (n int, err error) //sys Removexattr(path string, attr string) (err error) @@ -1518,6 +1873,17 @@ func Getpgrp() (pid int) { //sysnb Settimeofday(tv *Timeval) (err error) //sys Setns(fd int, nstype int) (err error) +// PrctlRetInt performs a prctl operation specified by option and further +// optional arguments arg2 through arg5 depending on option. It returns a +// non-negative integer that is returned by the prctl syscall. +func PrctlRetInt(option int, arg2 uintptr, arg3 uintptr, arg4 uintptr, arg5 uintptr) (int, error) { + ret, _, err := Syscall6(SYS_PRCTL, uintptr(option), uintptr(arg2), uintptr(arg3), uintptr(arg4), uintptr(arg5), 0) + if err != 0 { + return 0, err + } + return int(ret), nil +} + // issue 1435. // On linux Setuid and Setgid only affects the current thread, not the process. // This does not match what most callers expect so we must return an error @@ -1531,14 +1897,45 @@ func Setgid(uid int) (err error) { return EOPNOTSUPP } +// SetfsgidRetGid sets fsgid for current thread and returns previous fsgid set. +// setfsgid(2) will return a non-nil error only if its caller lacks CAP_SETUID capability. +// If the call fails due to other reasons, current fsgid will be returned. +func SetfsgidRetGid(gid int) (int, error) { + return setfsgid(gid) +} + +// SetfsuidRetUid sets fsuid for current thread and returns previous fsuid set. +// setfsgid(2) will return a non-nil error only if its caller lacks CAP_SETUID capability +// If the call fails due to other reasons, current fsuid will be returned. +func SetfsuidRetUid(uid int) (int, error) { + return setfsuid(uid) +} + +func Setfsgid(gid int) error { + _, err := setfsgid(gid) + return err +} + +func Setfsuid(uid int) error { + _, err := setfsuid(uid) + return err +} + +func Signalfd(fd int, sigmask *Sigset_t, flags int) (newfd int, err error) { + return signalfd(fd, sigmask, _C__NSIG/8, flags) +} + //sys Setpriority(which int, who int, prio int) (err error) //sys Setxattr(path string, attr string, data []byte, flags int) (err error) -//sys Signalfd(fd int, mask *Sigset_t, flags int) = SYS_SIGNALFD4 +//sys signalfd(fd int, sigmask *Sigset_t, maskSize uintptr, flags int) (newfd int, err error) = SYS_SIGNALFD4 //sys Statx(dirfd int, path string, flags int, mask int, stat *Statx_t) (err error) //sys Sync() //sys Syncfs(fd int) (err error) //sysnb Sysinfo(info *Sysinfo_t) (err error) //sys Tee(rfd int, wfd int, len int, flags int) (n int64, err error) +//sysnb TimerfdCreate(clockid int, flags int) (fd int, err error) +//sysnb TimerfdGettime(fd int, currValue *ItimerSpec) (err error) +//sysnb TimerfdSettime(fd int, flags int, newValue *ItimerSpec, oldValue *ItimerSpec) (err error) //sysnb Tgkill(tgid int, tid int, sig syscall.Signal) (err error) //sysnb Times(tms *Tms) (ticks uintptr, err error) //sysnb Umask(mask int) (oldmask int) @@ -1549,6 +1946,123 @@ func Setgid(uid int) (err error) { //sys exitThread(code int) (err error) = SYS_EXIT //sys readlen(fd int, p *byte, np int) (n int, err error) = SYS_READ //sys writelen(fd int, p *byte, np int) (n int, err error) = SYS_WRITE +//sys readv(fd int, iovs []Iovec) (n int, err error) = SYS_READV +//sys writev(fd int, iovs []Iovec) (n int, err error) = SYS_WRITEV +//sys preadv(fd int, iovs []Iovec, offs_l uintptr, offs_h uintptr) (n int, err error) = SYS_PREADV +//sys pwritev(fd int, iovs []Iovec, offs_l uintptr, offs_h uintptr) (n int, err error) = SYS_PWRITEV +//sys preadv2(fd int, iovs []Iovec, offs_l uintptr, offs_h uintptr, flags int) (n int, err error) = SYS_PREADV2 +//sys pwritev2(fd int, iovs []Iovec, offs_l uintptr, offs_h uintptr, flags int) (n int, err error) = SYS_PWRITEV2 + +func bytes2iovec(bs [][]byte) []Iovec { + iovecs := make([]Iovec, len(bs)) + for i, b := range bs { + iovecs[i].SetLen(len(b)) + if len(b) > 0 { + iovecs[i].Base = &b[0] + } else { + iovecs[i].Base = (*byte)(unsafe.Pointer(&_zero)) + } + } + return iovecs +} + +// offs2lohi splits offs into its lower and upper unsigned long. On 64-bit +// systems, hi will always be 0. On 32-bit systems, offs will be split in half. +// preadv/pwritev chose this calling convention so they don't need to add a +// padding-register for alignment on ARM. +func offs2lohi(offs int64) (lo, hi uintptr) { + return uintptr(offs), uintptr(uint64(offs) >> SizeofLong) +} + +func Readv(fd int, iovs [][]byte) (n int, err error) { + iovecs := bytes2iovec(iovs) + n, err = readv(fd, iovecs) + readvRacedetect(iovecs, n, err) + return n, err +} + +func Preadv(fd int, iovs [][]byte, offset int64) (n int, err error) { + iovecs := bytes2iovec(iovs) + lo, hi := offs2lohi(offset) + n, err = preadv(fd, iovecs, lo, hi) + readvRacedetect(iovecs, n, err) + return n, err +} + +func Preadv2(fd int, iovs [][]byte, offset int64, flags int) (n int, err error) { + iovecs := bytes2iovec(iovs) + lo, hi := offs2lohi(offset) + n, err = preadv2(fd, iovecs, lo, hi, flags) + readvRacedetect(iovecs, n, err) + return n, err +} + +func readvRacedetect(iovecs []Iovec, n int, err error) { + if !raceenabled { + return + } + for i := 0; n > 0 && i < len(iovecs); i++ { + m := int(iovecs[i].Len) + if m > n { + m = n + } + n -= m + if m > 0 { + raceWriteRange(unsafe.Pointer(iovecs[i].Base), m) + } + } + if err == nil { + raceAcquire(unsafe.Pointer(&ioSync)) + } +} + +func Writev(fd int, iovs [][]byte) (n int, err error) { + iovecs := bytes2iovec(iovs) + if raceenabled { + raceReleaseMerge(unsafe.Pointer(&ioSync)) + } + n, err = writev(fd, iovecs) + writevRacedetect(iovecs, n) + return n, err +} + +func Pwritev(fd int, iovs [][]byte, offset int64) (n int, err error) { + iovecs := bytes2iovec(iovs) + if raceenabled { + raceReleaseMerge(unsafe.Pointer(&ioSync)) + } + lo, hi := offs2lohi(offset) + n, err = pwritev(fd, iovecs, lo, hi) + writevRacedetect(iovecs, n) + return n, err +} + +func Pwritev2(fd int, iovs [][]byte, offset int64, flags int) (n int, err error) { + iovecs := bytes2iovec(iovs) + if raceenabled { + raceReleaseMerge(unsafe.Pointer(&ioSync)) + } + lo, hi := offs2lohi(offset) + n, err = pwritev2(fd, iovecs, lo, hi, flags) + writevRacedetect(iovecs, n) + return n, err +} + +func writevRacedetect(iovecs []Iovec, n int) { + if !raceenabled { + return + } + for i := 0; n > 0 && i < len(iovecs); i++ { + m := int(iovecs[i].Len) + if m > n { + m = n + } + n -= m + if m > 0 { + raceReadRange(unsafe.Pointer(iovecs[i].Base), m) + } + } +} // mmap varies by architecture; see syscall_linux_*.go. //sys munmap(addr uintptr, length uintptr) (err error) @@ -1591,11 +2105,30 @@ func Vmsplice(fd int, iovs []Iovec, flags int) (int, error) { return int(n), nil } +func isGroupMember(gid int) bool { + groups, err := Getgroups() + if err != nil { + return false + } + + for _, g := range groups { + if g == gid { + return true + } + } + return false +} + //sys faccessat(dirfd int, path string, mode uint32) (err error) +//sys Faccessat2(dirfd int, path string, mode uint32, flags int) (err error) func Faccessat(dirfd int, path string, mode uint32, flags int) (err error) { - if flags & ^(AT_SYMLINK_NOFOLLOW|AT_EACCESS) != 0 { - return EINVAL + if flags == 0 { + return faccessat(dirfd, path, mode) + } + + if err := Faccessat2(dirfd, path, mode, flags); err != ENOSYS && err != EPERM { + return err } // The Linux kernel faccessat system call does not take any flags. @@ -1604,8 +2137,8 @@ func Faccessat(dirfd int, path string, mode uint32, flags int) (err error) { // Because people naturally expect syscall.Faccessat to act // like C faccessat, we do the same. - if flags == 0 { - return faccessat(dirfd, path, mode) + if flags & ^(AT_SYMLINK_NOFOLLOW|AT_EACCESS) != 0 { + return EINVAL } var st Stat_t @@ -1648,7 +2181,7 @@ func Faccessat(dirfd int, path string, mode uint32, flags int) (err error) { gid = Getgid() } - if uint32(gid) == st.Gid { + if uint32(gid) == st.Gid || isGroupMember(gid) { fmode = (st.Mode >> 3) & 7 } else { fmode = st.Mode & 7 @@ -1662,6 +2195,105 @@ func Faccessat(dirfd int, path string, mode uint32, flags int) (err error) { return EACCES } +//sys nameToHandleAt(dirFD int, pathname string, fh *fileHandle, mountID *_C_int, flags int) (err error) = SYS_NAME_TO_HANDLE_AT +//sys openByHandleAt(mountFD int, fh *fileHandle, flags int) (fd int, err error) = SYS_OPEN_BY_HANDLE_AT + +// fileHandle is the argument to nameToHandleAt and openByHandleAt. We +// originally tried to generate it via unix/linux/types.go with "type +// fileHandle C.struct_file_handle" but that generated empty structs +// for mips64 and mips64le. Instead, hard code it for now (it's the +// same everywhere else) until the mips64 generator issue is fixed. +type fileHandle struct { + Bytes uint32 + Type int32 +} + +// FileHandle represents the C struct file_handle used by +// name_to_handle_at (see NameToHandleAt) and open_by_handle_at (see +// OpenByHandleAt). +type FileHandle struct { + *fileHandle +} + +// NewFileHandle constructs a FileHandle. +func NewFileHandle(handleType int32, handle []byte) FileHandle { + const hdrSize = unsafe.Sizeof(fileHandle{}) + buf := make([]byte, hdrSize+uintptr(len(handle))) + copy(buf[hdrSize:], handle) + fh := (*fileHandle)(unsafe.Pointer(&buf[0])) + fh.Type = handleType + fh.Bytes = uint32(len(handle)) + return FileHandle{fh} +} + +func (fh *FileHandle) Size() int { return int(fh.fileHandle.Bytes) } +func (fh *FileHandle) Type() int32 { return fh.fileHandle.Type } +func (fh *FileHandle) Bytes() []byte { + n := fh.Size() + if n == 0 { + return nil + } + return (*[1 << 30]byte)(unsafe.Pointer(uintptr(unsafe.Pointer(&fh.fileHandle.Type)) + 4))[:n:n] +} + +// NameToHandleAt wraps the name_to_handle_at system call; it obtains +// a handle for a path name. +func NameToHandleAt(dirfd int, path string, flags int) (handle FileHandle, mountID int, err error) { + var mid _C_int + // Try first with a small buffer, assuming the handle will + // only be 32 bytes. + size := uint32(32 + unsafe.Sizeof(fileHandle{})) + didResize := false + for { + buf := make([]byte, size) + fh := (*fileHandle)(unsafe.Pointer(&buf[0])) + fh.Bytes = size - uint32(unsafe.Sizeof(fileHandle{})) + err = nameToHandleAt(dirfd, path, fh, &mid, flags) + if err == EOVERFLOW { + if didResize { + // We shouldn't need to resize more than once + return + } + didResize = true + size = fh.Bytes + uint32(unsafe.Sizeof(fileHandle{})) + continue + } + if err != nil { + return + } + return FileHandle{fh}, int(mid), nil + } +} + +// OpenByHandleAt wraps the open_by_handle_at system call; it opens a +// file via a handle as previously returned by NameToHandleAt. +func OpenByHandleAt(mountFD int, handle FileHandle, flags int) (fd int, err error) { + return openByHandleAt(mountFD, handle.fileHandle, flags) +} + +// Klogset wraps the sys_syslog system call; it sets console_loglevel to +// the value specified by arg and passes a dummy pointer to bufp. +func Klogset(typ int, arg int) (err error) { + var p unsafe.Pointer + _, _, errno := Syscall(SYS_SYSLOG, uintptr(typ), uintptr(p), uintptr(arg)) + if errno != 0 { + return errnoErr(errno) + } + return nil +} + +// RemoteIovec is Iovec with the pointer replaced with an integer. +// It is used for ProcessVMReadv and ProcessVMWritev, where the pointer +// refers to a location in a different process' address space, which +// would confuse the Go garbage collector. +type RemoteIovec struct { + Base uintptr + Len int +} + +//sys ProcessVMReadv(pid int, localIov []Iovec, remoteIov []RemoteIovec, flags uint) (n int, err error) = SYS_PROCESS_VM_READV +//sys ProcessVMWritev(pid int, localIov []Iovec, remoteIov []RemoteIovec, flags uint) (n int, err error) = SYS_PROCESS_VM_WRITEV + /* * Unimplemented */ @@ -1669,8 +2301,6 @@ func Faccessat(dirfd int, path string, mode uint32, flags int) (err error) { // Alarm // ArchPrctl // Brk -// Capget -// Capset // ClockNanosleep // ClockSettime // Clone @@ -1758,7 +2388,6 @@ func Faccessat(dirfd int, path string, mode uint32, flags int) (err error) { // TimerGetoverrun // TimerGettime // TimerSettime -// Timerfd // Tkill (obsolete) // Tuxcall // Umount2 |