mirror of https://go.googlesource.com/go
1300 lines
36 KiB
Go
1300 lines
36 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Linux system calls.
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// This file is compiled as ordinary Go code,
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// but it is also input to mksyscall,
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// which parses the //sys lines and generates system call stubs.
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// Note that sometimes we use a lowercase //sys name and
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// wrap it in our own nicer implementation.
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package syscall
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import (
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"internal/itoa"
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runtimesyscall "internal/runtime/syscall"
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"runtime"
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"unsafe"
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)
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// Pull in entersyscall/exitsyscall for Syscall/Syscall6.
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//
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// Note that this can't be a push linkname because the runtime already has a
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// nameless linkname to export to assembly here and in x/sys. Additionally,
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// entersyscall fetches the caller PC and SP and thus can't have a wrapper
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// inbetween.
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//go:linkname runtime_entersyscall runtime.entersyscall
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func runtime_entersyscall()
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//go:linkname runtime_exitsyscall runtime.exitsyscall
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func runtime_exitsyscall()
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// N.B. For the Syscall functions below:
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//
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// //go:uintptrkeepalive because the uintptr argument may be converted pointers
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// that need to be kept alive in the caller.
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//
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// //go:nosplit because stack copying does not account for uintptrkeepalive, so
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// the stack must not grow. Stack copying cannot blindly assume that all
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// uintptr arguments are pointers, because some values may look like pointers,
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// but not really be pointers, and adjusting their value would break the call.
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//
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// //go:norace, on RawSyscall, to avoid race instrumentation if RawSyscall is
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// called after fork, or from a signal handler.
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//
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// //go:linkname to ensure ABI wrappers are generated for external callers
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// (notably x/sys/unix assembly).
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//go:uintptrkeepalive
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//go:nosplit
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//go:norace
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//go:linkname RawSyscall
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func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno) {
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return RawSyscall6(trap, a1, a2, a3, 0, 0, 0)
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}
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//go:uintptrkeepalive
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//go:nosplit
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//go:norace
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//go:linkname RawSyscall6
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func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno) {
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var errno uintptr
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r1, r2, errno = runtimesyscall.Syscall6(trap, a1, a2, a3, a4, a5, a6)
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err = Errno(errno)
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return
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}
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//go:uintptrkeepalive
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//go:nosplit
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//go:linkname Syscall
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func Syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno) {
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runtime_entersyscall()
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// N.B. Calling RawSyscall here is unsafe with atomic coverage
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// instrumentation and race mode.
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//
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// Coverage instrumentation will add a sync/atomic call to RawSyscall.
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// Race mode will add race instrumentation to sync/atomic. Race
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// instrumentation requires a P, which we no longer have.
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//
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// RawSyscall6 is fine because it is implemented in assembly and thus
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// has no coverage instrumentation.
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//
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// This is typically not a problem in the runtime because cmd/go avoids
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// adding coverage instrumentation to the runtime in race mode.
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r1, r2, err = RawSyscall6(trap, a1, a2, a3, 0, 0, 0)
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runtime_exitsyscall()
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return
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}
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//go:uintptrkeepalive
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//go:nosplit
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//go:linkname Syscall6
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func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno) {
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runtime_entersyscall()
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r1, r2, err = RawSyscall6(trap, a1, a2, a3, a4, a5, a6)
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runtime_exitsyscall()
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return
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}
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func rawSyscallNoError(trap, a1, a2, a3 uintptr) (r1, r2 uintptr)
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func rawVforkSyscall(trap, a1, a2, a3 uintptr) (r1 uintptr, err Errno)
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/*
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* Wrapped
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*/
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func Access(path string, mode uint32) (err error) {
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return Faccessat(_AT_FDCWD, path, mode, 0)
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}
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func Chmod(path string, mode uint32) (err error) {
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return Fchmodat(_AT_FDCWD, path, mode, 0)
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}
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func Chown(path string, uid int, gid int) (err error) {
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return Fchownat(_AT_FDCWD, path, uid, gid, 0)
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}
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func Creat(path string, mode uint32) (fd int, err error) {
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return Open(path, O_CREAT|O_WRONLY|O_TRUNC, mode)
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}
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func EpollCreate(size int) (fd int, err error) {
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if size <= 0 {
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return -1, EINVAL
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}
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return EpollCreate1(0)
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}
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func isGroupMember(gid int) bool {
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groups, err := Getgroups()
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if err != nil {
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return false
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}
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for _, g := range groups {
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if g == gid {
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return true
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}
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}
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return false
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}
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func isCapDacOverrideSet() bool {
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const _CAP_DAC_OVERRIDE = 1
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var c caps
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c.hdr.version = _LINUX_CAPABILITY_VERSION_3
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_, _, err := RawSyscall(SYS_CAPGET, uintptr(unsafe.Pointer(&c.hdr)), uintptr(unsafe.Pointer(&c.data[0])), 0)
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return err == 0 && c.data[0].effective&capToMask(_CAP_DAC_OVERRIDE) != 0
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}
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//sys faccessat(dirfd int, path string, mode uint32) (err error)
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//sys faccessat2(dirfd int, path string, mode uint32, flags int) (err error) = _SYS_faccessat2
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func Faccessat(dirfd int, path string, mode uint32, flags int) (err error) {
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if flags == 0 {
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return faccessat(dirfd, path, mode)
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}
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// Attempt to use the newer faccessat2, which supports flags directly,
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// falling back if it doesn't exist.
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//
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// Don't attempt on Android, which does not allow faccessat2 through
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// its seccomp policy [1] on any version of Android as of 2022-12-20.
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//
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// [1] https://cs.android.com/android/platform/superproject/+/master:bionic/libc/SECCOMP_BLOCKLIST_APP.TXT;l=4;drc=dbb8670dfdcc677f7e3b9262e93800fa14c4e417
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if runtime.GOOS != "android" {
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if err := faccessat2(dirfd, path, mode, flags); err != ENOSYS && err != EPERM {
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return err
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}
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}
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// The Linux kernel faccessat system call does not take any flags.
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// The glibc faccessat implements the flags itself; see
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// https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/unix/sysv/linux/faccessat.c;hb=HEAD
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// Because people naturally expect syscall.Faccessat to act
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// like C faccessat, we do the same.
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if flags & ^(_AT_SYMLINK_NOFOLLOW|_AT_EACCESS) != 0 {
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return EINVAL
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}
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var st Stat_t
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if err := fstatat(dirfd, path, &st, flags&_AT_SYMLINK_NOFOLLOW); err != nil {
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return err
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}
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mode &= 7
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if mode == 0 {
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return nil
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}
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// Fallback to checking permission bits.
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var uid int
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if flags&_AT_EACCESS != 0 {
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uid = Geteuid()
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if uid != 0 && isCapDacOverrideSet() {
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// If CAP_DAC_OVERRIDE is set, file access check is
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// done by the kernel in the same way as for root
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// (see generic_permission() in the Linux sources).
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uid = 0
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}
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} else {
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uid = Getuid()
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}
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if uid == 0 {
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if mode&1 == 0 {
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// Root can read and write any file.
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return nil
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}
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if st.Mode&0111 != 0 {
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// Root can execute any file that anybody can execute.
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return nil
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}
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return EACCES
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}
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var fmode uint32
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if uint32(uid) == st.Uid {
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fmode = (st.Mode >> 6) & 7
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} else {
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var gid int
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if flags&_AT_EACCESS != 0 {
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gid = Getegid()
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} else {
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gid = Getgid()
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}
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if uint32(gid) == st.Gid || isGroupMember(int(st.Gid)) {
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fmode = (st.Mode >> 3) & 7
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} else {
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fmode = st.Mode & 7
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}
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}
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if fmode&mode == mode {
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return nil
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}
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return EACCES
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}
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//sys fchmodat(dirfd int, path string, mode uint32) (err error)
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//sys fchmodat2(dirfd int, path string, mode uint32, flags int) (err error) = _SYS_fchmodat2
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func Fchmodat(dirfd int, path string, mode uint32, flags int) error {
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// Linux fchmodat doesn't support the flags parameter, but fchmodat2 does.
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// Try fchmodat2 if flags are specified.
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if flags != 0 {
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err := fchmodat2(dirfd, path, mode, flags)
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if err == ENOSYS {
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// fchmodat2 isn't available. If the flags are known to be valid,
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// return EOPNOTSUPP to indicate that fchmodat doesn't support them.
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if flags&^(_AT_SYMLINK_NOFOLLOW|_AT_EMPTY_PATH) != 0 {
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return EINVAL
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} else if flags&(_AT_SYMLINK_NOFOLLOW|_AT_EMPTY_PATH) != 0 {
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return EOPNOTSUPP
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}
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}
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return err
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}
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return fchmodat(dirfd, path, mode)
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}
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//sys linkat(olddirfd int, oldpath string, newdirfd int, newpath string, flags int) (err error)
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func Link(oldpath string, newpath string) (err error) {
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return linkat(_AT_FDCWD, oldpath, _AT_FDCWD, newpath, 0)
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}
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func Mkdir(path string, mode uint32) (err error) {
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return Mkdirat(_AT_FDCWD, path, mode)
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}
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func Mknod(path string, mode uint32, dev int) (err error) {
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return Mknodat(_AT_FDCWD, path, mode, dev)
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}
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func Open(path string, mode int, perm uint32) (fd int, err error) {
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return openat(_AT_FDCWD, path, mode|O_LARGEFILE, perm)
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}
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//sys openat(dirfd int, path string, flags int, mode uint32) (fd int, err error)
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func Openat(dirfd int, path string, flags int, mode uint32) (fd int, err error) {
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return openat(dirfd, path, flags|O_LARGEFILE, mode)
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}
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func Pipe(p []int) error {
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return Pipe2(p, 0)
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}
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//sysnb pipe2(p *[2]_C_int, flags int) (err error)
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func Pipe2(p []int, flags int) error {
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if len(p) != 2 {
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return EINVAL
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}
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var pp [2]_C_int
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err := pipe2(&pp, flags)
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if err == nil {
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p[0] = int(pp[0])
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p[1] = int(pp[1])
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}
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return err
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}
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//sys readlinkat(dirfd int, path string, buf []byte) (n int, err error)
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func Readlink(path string, buf []byte) (n int, err error) {
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return readlinkat(_AT_FDCWD, path, buf)
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}
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func Rename(oldpath string, newpath string) (err error) {
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return Renameat(_AT_FDCWD, oldpath, _AT_FDCWD, newpath)
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}
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func Rmdir(path string) error {
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return unlinkat(_AT_FDCWD, path, _AT_REMOVEDIR)
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}
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//sys symlinkat(oldpath string, newdirfd int, newpath string) (err error)
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func Symlink(oldpath string, newpath string) (err error) {
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return symlinkat(oldpath, _AT_FDCWD, newpath)
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}
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func Unlink(path string) error {
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return unlinkat(_AT_FDCWD, path, 0)
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}
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//sys unlinkat(dirfd int, path string, flags int) (err error)
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func Unlinkat(dirfd int, path string) error {
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return unlinkat(dirfd, path, 0)
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}
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func Utimes(path string, tv []Timeval) (err error) {
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if len(tv) != 2 {
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return EINVAL
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}
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return utimes(path, (*[2]Timeval)(unsafe.Pointer(&tv[0])))
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}
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//sys utimensat(dirfd int, path string, times *[2]Timespec, flag int) (err error)
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func UtimesNano(path string, ts []Timespec) (err error) {
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if len(ts) != 2 {
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return EINVAL
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}
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return utimensat(_AT_FDCWD, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), 0)
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}
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func Futimesat(dirfd int, path string, tv []Timeval) (err error) {
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if len(tv) != 2 {
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return EINVAL
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}
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return futimesat(dirfd, path, (*[2]Timeval)(unsafe.Pointer(&tv[0])))
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}
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func Futimes(fd int, tv []Timeval) (err error) {
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// Believe it or not, this is the best we can do on Linux
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// (and is what glibc does).
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return Utimes("/proc/self/fd/"+itoa.Itoa(fd), tv)
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}
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const ImplementsGetwd = true
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//sys Getcwd(buf []byte) (n int, err error)
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func Getwd() (wd string, err error) {
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var buf [PathMax]byte
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n, err := Getcwd(buf[0:])
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if err != nil {
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return "", err
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}
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// Getcwd returns the number of bytes written to buf, including the NUL.
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if n < 1 || n > len(buf) || buf[n-1] != 0 {
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return "", EINVAL
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}
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// In some cases, Linux can return a path that starts with the
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// "(unreachable)" prefix, which can potentially be a valid relative
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// path. To work around that, return ENOENT if path is not absolute.
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if buf[0] != '/' {
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return "", ENOENT
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}
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return string(buf[0 : n-1]), nil
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}
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func Getgroups() (gids []int, err error) {
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n, err := getgroups(0, nil)
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if err != nil {
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return nil, err
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}
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if n == 0 {
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return nil, nil
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}
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// Sanity check group count. Max is 1<<16 on Linux.
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if n < 0 || n > 1<<20 {
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return nil, EINVAL
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}
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a := make([]_Gid_t, n)
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n, err = getgroups(n, &a[0])
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if err != nil {
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return nil, err
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}
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gids = make([]int, n)
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for i, v := range a[0:n] {
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gids[i] = int(v)
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}
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return
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}
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var cgo_libc_setgroups unsafe.Pointer // non-nil if cgo linked.
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func Setgroups(gids []int) (err error) {
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n := uintptr(len(gids))
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if n == 0 {
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if cgo_libc_setgroups == nil {
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if _, _, e1 := AllThreadsSyscall(_SYS_setgroups, 0, 0, 0); e1 != 0 {
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err = errnoErr(e1)
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}
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return
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}
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if ret := cgocaller(cgo_libc_setgroups, 0, 0); ret != 0 {
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err = errnoErr(Errno(ret))
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}
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return
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}
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a := make([]_Gid_t, len(gids))
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for i, v := range gids {
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a[i] = _Gid_t(v)
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}
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if cgo_libc_setgroups == nil {
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if _, _, e1 := AllThreadsSyscall(_SYS_setgroups, n, uintptr(unsafe.Pointer(&a[0])), 0); e1 != 0 {
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err = errnoErr(e1)
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}
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return
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}
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if ret := cgocaller(cgo_libc_setgroups, n, uintptr(unsafe.Pointer(&a[0]))); ret != 0 {
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err = errnoErr(Errno(ret))
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}
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return
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}
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type WaitStatus uint32
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// Wait status is 7 bits at bottom, either 0 (exited),
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// 0x7F (stopped), or a signal number that caused an exit.
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// The 0x80 bit is whether there was a core dump.
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// An extra number (exit code, signal causing a stop)
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// is in the high bits. At least that's the idea.
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// There are various irregularities. For example, the
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// "continued" status is 0xFFFF, distinguishing itself
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// from stopped via the core dump bit.
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const (
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mask = 0x7F
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core = 0x80
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exited = 0x00
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stopped = 0x7F
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shift = 8
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)
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func (w WaitStatus) Exited() bool { return w&mask == exited }
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func (w WaitStatus) Signaled() bool { return w&mask != stopped && w&mask != exited }
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func (w WaitStatus) Stopped() bool { return w&0xFF == stopped }
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func (w WaitStatus) Continued() bool { return w == 0xFFFF }
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func (w WaitStatus) CoreDump() bool { return w.Signaled() && w&core != 0 }
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func (w WaitStatus) ExitStatus() int {
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if !w.Exited() {
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return -1
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}
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return int(w>>shift) & 0xFF
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}
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func (w WaitStatus) Signal() Signal {
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if !w.Signaled() {
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return -1
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}
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return Signal(w & mask)
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}
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func (w WaitStatus) StopSignal() Signal {
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if !w.Stopped() {
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return -1
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}
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return Signal(w>>shift) & 0xFF
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}
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func (w WaitStatus) TrapCause() int {
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if w.StopSignal() != SIGTRAP {
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return -1
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}
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return int(w>>shift) >> 8
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}
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|
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//sys wait4(pid int, wstatus *_C_int, options int, rusage *Rusage) (wpid int, err error)
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|
|
func Wait4(pid int, wstatus *WaitStatus, options int, rusage *Rusage) (wpid int, err error) {
|
|
var status _C_int
|
|
wpid, err = wait4(pid, &status, options, rusage)
|
|
if wstatus != nil {
|
|
*wstatus = WaitStatus(status)
|
|
}
|
|
return
|
|
}
|
|
|
|
func Mkfifo(path string, mode uint32) (err error) {
|
|
return Mknod(path, mode|S_IFIFO, 0)
|
|
}
|
|
|
|
func (sa *SockaddrInet4) sockaddr() (unsafe.Pointer, _Socklen, error) {
|
|
if sa.Port < 0 || sa.Port > 0xFFFF {
|
|
return nil, 0, EINVAL
|
|
}
|
|
sa.raw.Family = AF_INET
|
|
p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port))
|
|
p[0] = byte(sa.Port >> 8)
|
|
p[1] = byte(sa.Port)
|
|
sa.raw.Addr = sa.Addr
|
|
return unsafe.Pointer(&sa.raw), SizeofSockaddrInet4, nil
|
|
}
|
|
|
|
func (sa *SockaddrInet6) sockaddr() (unsafe.Pointer, _Socklen, error) {
|
|
if sa.Port < 0 || sa.Port > 0xFFFF {
|
|
return nil, 0, EINVAL
|
|
}
|
|
sa.raw.Family = AF_INET6
|
|
p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port))
|
|
p[0] = byte(sa.Port >> 8)
|
|
p[1] = byte(sa.Port)
|
|
sa.raw.Scope_id = sa.ZoneId
|
|
sa.raw.Addr = sa.Addr
|
|
return unsafe.Pointer(&sa.raw), SizeofSockaddrInet6, nil
|
|
}
|
|
|
|
func (sa *SockaddrUnix) sockaddr() (unsafe.Pointer, _Socklen, error) {
|
|
name := sa.Name
|
|
n := len(name)
|
|
if n > len(sa.raw.Path) {
|
|
return nil, 0, EINVAL
|
|
}
|
|
if n == len(sa.raw.Path) && name[0] != '@' {
|
|
return nil, 0, EINVAL
|
|
}
|
|
sa.raw.Family = AF_UNIX
|
|
for i := 0; i < n; i++ {
|
|
sa.raw.Path[i] = int8(name[i])
|
|
}
|
|
// length is family (uint16), name, NUL.
|
|
sl := _Socklen(2)
|
|
if n > 0 {
|
|
sl += _Socklen(n) + 1
|
|
}
|
|
if sa.raw.Path[0] == '@' || (sa.raw.Path[0] == 0 && sl > 3) {
|
|
// Check sl > 3 so we don't change unnamed socket behavior.
|
|
sa.raw.Path[0] = 0
|
|
// Don't count trailing NUL for abstract address.
|
|
sl--
|
|
}
|
|
|
|
return unsafe.Pointer(&sa.raw), sl, nil
|
|
}
|
|
|
|
type SockaddrLinklayer struct {
|
|
Protocol uint16
|
|
Ifindex int
|
|
Hatype uint16
|
|
Pkttype uint8
|
|
Halen uint8
|
|
Addr [8]byte
|
|
raw RawSockaddrLinklayer
|
|
}
|
|
|
|
func (sa *SockaddrLinklayer) sockaddr() (unsafe.Pointer, _Socklen, error) {
|
|
if sa.Ifindex < 0 || sa.Ifindex > 0x7fffffff {
|
|
return nil, 0, EINVAL
|
|
}
|
|
sa.raw.Family = AF_PACKET
|
|
sa.raw.Protocol = sa.Protocol
|
|
sa.raw.Ifindex = int32(sa.Ifindex)
|
|
sa.raw.Hatype = sa.Hatype
|
|
sa.raw.Pkttype = sa.Pkttype
|
|
sa.raw.Halen = sa.Halen
|
|
sa.raw.Addr = sa.Addr
|
|
return unsafe.Pointer(&sa.raw), SizeofSockaddrLinklayer, nil
|
|
}
|
|
|
|
type SockaddrNetlink struct {
|
|
Family uint16
|
|
Pad uint16
|
|
Pid uint32
|
|
Groups uint32
|
|
raw RawSockaddrNetlink
|
|
}
|
|
|
|
func (sa *SockaddrNetlink) sockaddr() (unsafe.Pointer, _Socklen, error) {
|
|
sa.raw.Family = AF_NETLINK
|
|
sa.raw.Pad = sa.Pad
|
|
sa.raw.Pid = sa.Pid
|
|
sa.raw.Groups = sa.Groups
|
|
return unsafe.Pointer(&sa.raw), SizeofSockaddrNetlink, nil
|
|
}
|
|
|
|
func anyToSockaddr(rsa *RawSockaddrAny) (Sockaddr, error) {
|
|
switch rsa.Addr.Family {
|
|
case AF_NETLINK:
|
|
pp := (*RawSockaddrNetlink)(unsafe.Pointer(rsa))
|
|
sa := new(SockaddrNetlink)
|
|
sa.Family = pp.Family
|
|
sa.Pad = pp.Pad
|
|
sa.Pid = pp.Pid
|
|
sa.Groups = pp.Groups
|
|
return sa, nil
|
|
|
|
case AF_PACKET:
|
|
pp := (*RawSockaddrLinklayer)(unsafe.Pointer(rsa))
|
|
sa := new(SockaddrLinklayer)
|
|
sa.Protocol = pp.Protocol
|
|
sa.Ifindex = int(pp.Ifindex)
|
|
sa.Hatype = pp.Hatype
|
|
sa.Pkttype = pp.Pkttype
|
|
sa.Halen = pp.Halen
|
|
sa.Addr = pp.Addr
|
|
return sa, nil
|
|
|
|
case AF_UNIX:
|
|
pp := (*RawSockaddrUnix)(unsafe.Pointer(rsa))
|
|
sa := new(SockaddrUnix)
|
|
if pp.Path[0] == 0 {
|
|
// "Abstract" Unix domain socket.
|
|
// Rewrite leading NUL as @ for textual display.
|
|
// (This is the standard convention.)
|
|
// Not friendly to overwrite in place,
|
|
// but the callers below don't care.
|
|
pp.Path[0] = '@'
|
|
}
|
|
|
|
// Assume path ends at NUL.
|
|
// This is not technically the Linux semantics for
|
|
// abstract Unix domain sockets--they are supposed
|
|
// to be uninterpreted fixed-size binary blobs--but
|
|
// everyone uses this convention.
|
|
n := 0
|
|
for n < len(pp.Path) && pp.Path[n] != 0 {
|
|
n++
|
|
}
|
|
sa.Name = string(unsafe.Slice((*byte)(unsafe.Pointer(&pp.Path[0])), n))
|
|
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])
|
|
sa.Addr = pp.Addr
|
|
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
|
|
sa.Addr = pp.Addr
|
|
return sa, nil
|
|
}
|
|
return nil, EAFNOSUPPORT
|
|
}
|
|
|
|
func Accept4(fd int, flags int) (nfd int, sa Sockaddr, err error) {
|
|
var rsa RawSockaddrAny
|
|
var len _Socklen = SizeofSockaddrAny
|
|
nfd, err = accept4(fd, &rsa, &len, flags)
|
|
if err != nil {
|
|
return
|
|
}
|
|
if len > SizeofSockaddrAny {
|
|
panic("RawSockaddrAny too small")
|
|
}
|
|
sa, err = anyToSockaddr(&rsa)
|
|
if err != nil {
|
|
Close(nfd)
|
|
nfd = 0
|
|
}
|
|
return
|
|
}
|
|
|
|
func Getsockname(fd int) (sa Sockaddr, err error) {
|
|
var rsa RawSockaddrAny
|
|
var len _Socklen = SizeofSockaddrAny
|
|
if err = getsockname(fd, &rsa, &len); err != nil {
|
|
return
|
|
}
|
|
return anyToSockaddr(&rsa)
|
|
}
|
|
|
|
func GetsockoptInet4Addr(fd, level, opt int) (value [4]byte, err error) {
|
|
vallen := _Socklen(4)
|
|
err = getsockopt(fd, level, opt, unsafe.Pointer(&value[0]), &vallen)
|
|
return value, err
|
|
}
|
|
|
|
func GetsockoptIPMreq(fd, level, opt int) (*IPMreq, error) {
|
|
var value IPMreq
|
|
vallen := _Socklen(SizeofIPMreq)
|
|
err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
|
|
return &value, err
|
|
}
|
|
|
|
func GetsockoptIPMreqn(fd, level, opt int) (*IPMreqn, error) {
|
|
var value IPMreqn
|
|
vallen := _Socklen(SizeofIPMreqn)
|
|
err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
|
|
return &value, err
|
|
}
|
|
|
|
func GetsockoptIPv6Mreq(fd, level, opt int) (*IPv6Mreq, error) {
|
|
var value IPv6Mreq
|
|
vallen := _Socklen(SizeofIPv6Mreq)
|
|
err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
|
|
return &value, err
|
|
}
|
|
|
|
func GetsockoptIPv6MTUInfo(fd, level, opt int) (*IPv6MTUInfo, error) {
|
|
var value IPv6MTUInfo
|
|
vallen := _Socklen(SizeofIPv6MTUInfo)
|
|
err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
|
|
return &value, err
|
|
}
|
|
|
|
func GetsockoptICMPv6Filter(fd, level, opt int) (*ICMPv6Filter, error) {
|
|
var value ICMPv6Filter
|
|
vallen := _Socklen(SizeofICMPv6Filter)
|
|
err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
|
|
return &value, err
|
|
}
|
|
|
|
func GetsockoptUcred(fd, level, opt int) (*Ucred, error) {
|
|
var value Ucred
|
|
vallen := _Socklen(SizeofUcred)
|
|
err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
|
|
return &value, err
|
|
}
|
|
|
|
func SetsockoptIPMreqn(fd, level, opt int, mreq *IPMreqn) (err error) {
|
|
return setsockopt(fd, level, opt, unsafe.Pointer(mreq), unsafe.Sizeof(*mreq))
|
|
}
|
|
|
|
func recvmsgRaw(fd int, p, oob []byte, flags int, rsa *RawSockaddrAny) (n, oobn int, recvflags int, err error) {
|
|
var msg Msghdr
|
|
msg.Name = (*byte)(unsafe.Pointer(rsa))
|
|
msg.Namelen = uint32(SizeofSockaddrAny)
|
|
var iov Iovec
|
|
if len(p) > 0 {
|
|
iov.Base = &p[0]
|
|
iov.SetLen(len(p))
|
|
}
|
|
var dummy byte
|
|
if len(oob) > 0 {
|
|
if len(p) == 0 {
|
|
var sockType int
|
|
sockType, err = GetsockoptInt(fd, SOL_SOCKET, SO_TYPE)
|
|
if err != nil {
|
|
return
|
|
}
|
|
// receive at least one normal byte
|
|
if sockType != SOCK_DGRAM {
|
|
iov.Base = &dummy
|
|
iov.SetLen(1)
|
|
}
|
|
}
|
|
msg.Control = &oob[0]
|
|
msg.SetControllen(len(oob))
|
|
}
|
|
msg.Iov = &iov
|
|
msg.Iovlen = 1
|
|
if n, err = recvmsg(fd, &msg, flags); err != nil {
|
|
return
|
|
}
|
|
oobn = int(msg.Controllen)
|
|
recvflags = int(msg.Flags)
|
|
return
|
|
}
|
|
|
|
func sendmsgN(fd int, p, oob []byte, ptr unsafe.Pointer, salen _Socklen, flags int) (n int, err error) {
|
|
var msg Msghdr
|
|
msg.Name = (*byte)(ptr)
|
|
msg.Namelen = uint32(salen)
|
|
var iov Iovec
|
|
if len(p) > 0 {
|
|
iov.Base = &p[0]
|
|
iov.SetLen(len(p))
|
|
}
|
|
var dummy byte
|
|
if len(oob) > 0 {
|
|
if len(p) == 0 {
|
|
var sockType int
|
|
sockType, err = GetsockoptInt(fd, SOL_SOCKET, SO_TYPE)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
// send at least one normal byte
|
|
if sockType != SOCK_DGRAM {
|
|
iov.Base = &dummy
|
|
iov.SetLen(1)
|
|
}
|
|
}
|
|
msg.Control = &oob[0]
|
|
msg.SetControllen(len(oob))
|
|
}
|
|
msg.Iov = &iov
|
|
msg.Iovlen = 1
|
|
if n, err = sendmsg(fd, &msg, flags); err != nil {
|
|
return 0, err
|
|
}
|
|
if len(oob) > 0 && len(p) == 0 {
|
|
n = 0
|
|
}
|
|
return n, nil
|
|
}
|
|
|
|
// BindToDevice binds the socket associated with fd to device.
|
|
func BindToDevice(fd int, device string) (err error) {
|
|
return SetsockoptString(fd, SOL_SOCKET, SO_BINDTODEVICE, device)
|
|
}
|
|
|
|
//sys ptrace(request int, pid int, addr uintptr, data uintptr) (err error)
|
|
//sys ptracePtr(request int, pid int, addr uintptr, data unsafe.Pointer) (err error) = SYS_PTRACE
|
|
|
|
func ptracePeek(req int, pid int, addr uintptr, out []byte) (count int, err error) {
|
|
// The peek requests are machine-size oriented, so we wrap it
|
|
// to retrieve arbitrary-length data.
|
|
|
|
// The ptrace syscall differs from glibc's ptrace.
|
|
// Peeks returns the word in *data, not as the return value.
|
|
|
|
var buf [sizeofPtr]byte
|
|
|
|
// Leading edge. PEEKTEXT/PEEKDATA don't require aligned
|
|
// access (PEEKUSER warns that it might), but if we don't
|
|
// align our reads, we might straddle an unmapped page
|
|
// boundary and not get the bytes leading up to the page
|
|
// boundary.
|
|
n := 0
|
|
if addr%sizeofPtr != 0 {
|
|
err = ptracePtr(req, pid, addr-addr%sizeofPtr, unsafe.Pointer(&buf[0]))
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
n += copy(out, buf[addr%sizeofPtr:])
|
|
out = out[n:]
|
|
}
|
|
|
|
// Remainder.
|
|
for len(out) > 0 {
|
|
// We use an internal buffer to guarantee alignment.
|
|
// It's not documented if this is necessary, but we're paranoid.
|
|
err = ptracePtr(req, pid, addr+uintptr(n), unsafe.Pointer(&buf[0]))
|
|
if err != nil {
|
|
return n, err
|
|
}
|
|
copied := copy(out, buf[0:])
|
|
n += copied
|
|
out = out[copied:]
|
|
}
|
|
|
|
return n, nil
|
|
}
|
|
|
|
func PtracePeekText(pid int, addr uintptr, out []byte) (count int, err error) {
|
|
return ptracePeek(PTRACE_PEEKTEXT, pid, addr, out)
|
|
}
|
|
|
|
func PtracePeekData(pid int, addr uintptr, out []byte) (count int, err error) {
|
|
return ptracePeek(PTRACE_PEEKDATA, pid, addr, out)
|
|
}
|
|
|
|
func ptracePoke(pokeReq int, peekReq int, pid int, addr uintptr, data []byte) (count int, err error) {
|
|
// As for ptracePeek, we need to align our accesses to deal
|
|
// with the possibility of straddling an invalid page.
|
|
|
|
// Leading edge.
|
|
n := 0
|
|
if addr%sizeofPtr != 0 {
|
|
var buf [sizeofPtr]byte
|
|
err = ptracePtr(peekReq, pid, addr-addr%sizeofPtr, unsafe.Pointer(&buf[0]))
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
n += copy(buf[addr%sizeofPtr:], data)
|
|
word := *((*uintptr)(unsafe.Pointer(&buf[0])))
|
|
err = ptrace(pokeReq, pid, addr-addr%sizeofPtr, word)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
data = data[n:]
|
|
}
|
|
|
|
// Interior.
|
|
for len(data) > sizeofPtr {
|
|
word := *((*uintptr)(unsafe.Pointer(&data[0])))
|
|
err = ptrace(pokeReq, pid, addr+uintptr(n), word)
|
|
if err != nil {
|
|
return n, err
|
|
}
|
|
n += sizeofPtr
|
|
data = data[sizeofPtr:]
|
|
}
|
|
|
|
// Trailing edge.
|
|
if len(data) > 0 {
|
|
var buf [sizeofPtr]byte
|
|
err = ptracePtr(peekReq, pid, addr+uintptr(n), unsafe.Pointer(&buf[0]))
|
|
if err != nil {
|
|
return n, err
|
|
}
|
|
copy(buf[0:], data)
|
|
word := *((*uintptr)(unsafe.Pointer(&buf[0])))
|
|
err = ptrace(pokeReq, pid, addr+uintptr(n), word)
|
|
if err != nil {
|
|
return n, err
|
|
}
|
|
n += len(data)
|
|
}
|
|
|
|
return n, nil
|
|
}
|
|
|
|
func PtracePokeText(pid int, addr uintptr, data []byte) (count int, err error) {
|
|
return ptracePoke(PTRACE_POKETEXT, PTRACE_PEEKTEXT, pid, addr, data)
|
|
}
|
|
|
|
func PtracePokeData(pid int, addr uintptr, data []byte) (count int, err error) {
|
|
return ptracePoke(PTRACE_POKEDATA, PTRACE_PEEKDATA, pid, addr, data)
|
|
}
|
|
|
|
const (
|
|
_NT_PRSTATUS = 1
|
|
)
|
|
|
|
func PtraceGetRegs(pid int, regsout *PtraceRegs) (err error) {
|
|
var iov Iovec
|
|
iov.Base = (*byte)(unsafe.Pointer(regsout))
|
|
iov.SetLen(int(unsafe.Sizeof(*regsout)))
|
|
return ptracePtr(PTRACE_GETREGSET, pid, uintptr(_NT_PRSTATUS), unsafe.Pointer(&iov))
|
|
}
|
|
|
|
func PtraceSetRegs(pid int, regs *PtraceRegs) (err error) {
|
|
var iov Iovec
|
|
iov.Base = (*byte)(unsafe.Pointer(regs))
|
|
iov.SetLen(int(unsafe.Sizeof(*regs)))
|
|
return ptracePtr(PTRACE_SETREGSET, pid, uintptr(_NT_PRSTATUS), unsafe.Pointer(&iov))
|
|
}
|
|
|
|
func PtraceSetOptions(pid int, options int) (err error) {
|
|
return ptrace(PTRACE_SETOPTIONS, pid, 0, uintptr(options))
|
|
}
|
|
|
|
func PtraceGetEventMsg(pid int) (msg uint, err error) {
|
|
var data _C_long
|
|
err = ptracePtr(PTRACE_GETEVENTMSG, pid, 0, unsafe.Pointer(&data))
|
|
msg = uint(data)
|
|
return
|
|
}
|
|
|
|
func PtraceCont(pid int, signal int) (err error) {
|
|
return ptrace(PTRACE_CONT, pid, 0, uintptr(signal))
|
|
}
|
|
|
|
func PtraceSyscall(pid int, signal int) (err error) {
|
|
return ptrace(PTRACE_SYSCALL, pid, 0, uintptr(signal))
|
|
}
|
|
|
|
func PtraceSingleStep(pid int) (err error) { return ptrace(PTRACE_SINGLESTEP, pid, 0, 0) }
|
|
|
|
func PtraceAttach(pid int) (err error) { return ptrace(PTRACE_ATTACH, 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)
|
|
|
|
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)
|
|
|
|
func Mount(source string, target string, fstype string, flags uintptr, data string) (err error) {
|
|
// Certain file systems get rather angry and EINVAL if you give
|
|
// them an empty string of data, rather than NULL.
|
|
if data == "" {
|
|
return mount(source, target, fstype, flags, nil)
|
|
}
|
|
datap, err := BytePtrFromString(data)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return mount(source, target, fstype, flags, datap)
|
|
}
|
|
|
|
// Sendto
|
|
// Recvfrom
|
|
// Socketpair
|
|
|
|
/*
|
|
* Direct access
|
|
*/
|
|
//sys Acct(path string) (err error)
|
|
//sys Adjtimex(buf *Timex) (state int, err error)
|
|
//sys Chdir(path string) (err error)
|
|
//sys Chroot(path string) (err error)
|
|
//sys Close(fd int) (err error)
|
|
//sys Dup(oldfd int) (fd int, err error)
|
|
//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)
|
|
//sys Fallocate(fd int, mode uint32, off int64, len int64) (err error)
|
|
//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 Flock(fd int, how int) (err error)
|
|
//sys Fsync(fd int) (err error)
|
|
//sys Getdents(fd int, buf []byte) (n int, err error) = SYS_GETDENTS64
|
|
//sysnb Getpgid(pid int) (pgid int, err error)
|
|
|
|
func Getpgrp() (pid int) {
|
|
pid, _ = Getpgid(0)
|
|
return
|
|
}
|
|
|
|
//sysnb Getpid() (pid int)
|
|
//sysnb Getppid() (ppid int)
|
|
//sys Getpriority(which int, who int) (prio int, err error)
|
|
//sysnb Getrusage(who int, rusage *Rusage) (err error)
|
|
//sysnb Gettid() (tid int)
|
|
//sys Getxattr(path string, attr string, dest []byte) (sz int, err error)
|
|
//sys InotifyAddWatch(fd int, pathname string, mask uint32) (watchdesc int, err error)
|
|
//sysnb InotifyInit1(flags int) (fd int, err error)
|
|
//sysnb InotifyRmWatch(fd int, watchdesc uint32) (success int, err error)
|
|
//sysnb Kill(pid int, sig Signal) (err error)
|
|
//sys Klogctl(typ int, buf []byte) (n int, err error) = SYS_SYSLOG
|
|
//sys Listxattr(path string, dest []byte) (sz int, err error)
|
|
//sys Mkdirat(dirfd int, path string, mode uint32) (err error)
|
|
//sys Mknodat(dirfd int, path string, mode uint32, dev int) (err error)
|
|
//sys Nanosleep(time *Timespec, leftover *Timespec) (err error)
|
|
//sys PivotRoot(newroot string, putold string) (err error) = SYS_PIVOT_ROOT
|
|
//sysnb prlimit1(pid int, resource int, newlimit *Rlimit, old *Rlimit) (err error) = SYS_PRLIMIT64
|
|
//sys read(fd int, p []byte) (n int, err error)
|
|
//sys Removexattr(path string, attr string) (err error)
|
|
//sys Setdomainname(p []byte) (err error)
|
|
//sys Sethostname(p []byte) (err error)
|
|
//sysnb Setpgid(pid int, pgid int) (err error)
|
|
//sysnb Setsid() (pid int, err error)
|
|
//sysnb Settimeofday(tv *Timeval) (err error)
|
|
|
|
// Provided by runtime.syscall_runtime_doAllThreadsSyscall which stops the
|
|
// world and invokes the syscall on each OS thread. Once this function returns,
|
|
// all threads are in sync.
|
|
//
|
|
//go:uintptrescapes
|
|
func runtime_doAllThreadsSyscall(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr)
|
|
|
|
// AllThreadsSyscall performs a syscall on each OS thread of the Go
|
|
// runtime. It first invokes the syscall on one thread. Should that
|
|
// invocation fail, it returns immediately with the error status.
|
|
// Otherwise, it invokes the syscall on all of the remaining threads
|
|
// in parallel. It will terminate the program if it observes any
|
|
// invoked syscall's return value differs from that of the first
|
|
// invocation.
|
|
//
|
|
// AllThreadsSyscall is intended for emulating simultaneous
|
|
// process-wide state changes that require consistently modifying
|
|
// per-thread state of the Go runtime.
|
|
//
|
|
// AllThreadsSyscall is unaware of any threads that are launched
|
|
// explicitly by cgo linked code, so the function always returns
|
|
// [ENOTSUP] in binaries that use cgo.
|
|
//
|
|
//go:uintptrescapes
|
|
func AllThreadsSyscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno) {
|
|
if cgo_libc_setegid != nil {
|
|
return minus1, minus1, ENOTSUP
|
|
}
|
|
r1, r2, errno := runtime_doAllThreadsSyscall(trap, a1, a2, a3, 0, 0, 0)
|
|
return r1, r2, Errno(errno)
|
|
}
|
|
|
|
// AllThreadsSyscall6 is like [AllThreadsSyscall], but extended to six
|
|
// arguments.
|
|
//
|
|
//go:uintptrescapes
|
|
func AllThreadsSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno) {
|
|
if cgo_libc_setegid != nil {
|
|
return minus1, minus1, ENOTSUP
|
|
}
|
|
r1, r2, errno := runtime_doAllThreadsSyscall(trap, a1, a2, a3, a4, a5, a6)
|
|
return r1, r2, Errno(errno)
|
|
}
|
|
|
|
// linked by runtime.cgocall.go
|
|
//
|
|
//go:uintptrescapes
|
|
func cgocaller(unsafe.Pointer, ...uintptr) uintptr
|
|
|
|
var cgo_libc_setegid unsafe.Pointer // non-nil if cgo linked.
|
|
|
|
const minus1 = ^uintptr(0)
|
|
|
|
func Setegid(egid int) (err error) {
|
|
if cgo_libc_setegid == nil {
|
|
if _, _, e1 := AllThreadsSyscall(SYS_SETRESGID, minus1, uintptr(egid), minus1); e1 != 0 {
|
|
err = errnoErr(e1)
|
|
}
|
|
} else if ret := cgocaller(cgo_libc_setegid, uintptr(egid)); ret != 0 {
|
|
err = errnoErr(Errno(ret))
|
|
}
|
|
return
|
|
}
|
|
|
|
var cgo_libc_seteuid unsafe.Pointer // non-nil if cgo linked.
|
|
|
|
func Seteuid(euid int) (err error) {
|
|
if cgo_libc_seteuid == nil {
|
|
if _, _, e1 := AllThreadsSyscall(SYS_SETRESUID, minus1, uintptr(euid), minus1); e1 != 0 {
|
|
err = errnoErr(e1)
|
|
}
|
|
} else if ret := cgocaller(cgo_libc_seteuid, uintptr(euid)); ret != 0 {
|
|
err = errnoErr(Errno(ret))
|
|
}
|
|
return
|
|
}
|
|
|
|
var cgo_libc_setgid unsafe.Pointer // non-nil if cgo linked.
|
|
|
|
func Setgid(gid int) (err error) {
|
|
if cgo_libc_setgid == nil {
|
|
if _, _, e1 := AllThreadsSyscall(sys_SETGID, uintptr(gid), 0, 0); e1 != 0 {
|
|
err = errnoErr(e1)
|
|
}
|
|
} else if ret := cgocaller(cgo_libc_setgid, uintptr(gid)); ret != 0 {
|
|
err = errnoErr(Errno(ret))
|
|
}
|
|
return
|
|
}
|
|
|
|
var cgo_libc_setregid unsafe.Pointer // non-nil if cgo linked.
|
|
|
|
func Setregid(rgid, egid int) (err error) {
|
|
if cgo_libc_setregid == nil {
|
|
if _, _, e1 := AllThreadsSyscall(sys_SETREGID, uintptr(rgid), uintptr(egid), 0); e1 != 0 {
|
|
err = errnoErr(e1)
|
|
}
|
|
} else if ret := cgocaller(cgo_libc_setregid, uintptr(rgid), uintptr(egid)); ret != 0 {
|
|
err = errnoErr(Errno(ret))
|
|
}
|
|
return
|
|
}
|
|
|
|
var cgo_libc_setresgid unsafe.Pointer // non-nil if cgo linked.
|
|
|
|
func Setresgid(rgid, egid, sgid int) (err error) {
|
|
if cgo_libc_setresgid == nil {
|
|
if _, _, e1 := AllThreadsSyscall(sys_SETRESGID, uintptr(rgid), uintptr(egid), uintptr(sgid)); e1 != 0 {
|
|
err = errnoErr(e1)
|
|
}
|
|
} else if ret := cgocaller(cgo_libc_setresgid, uintptr(rgid), uintptr(egid), uintptr(sgid)); ret != 0 {
|
|
err = errnoErr(Errno(ret))
|
|
}
|
|
return
|
|
}
|
|
|
|
var cgo_libc_setresuid unsafe.Pointer // non-nil if cgo linked.
|
|
|
|
func Setresuid(ruid, euid, suid int) (err error) {
|
|
if cgo_libc_setresuid == nil {
|
|
if _, _, e1 := AllThreadsSyscall(sys_SETRESUID, uintptr(ruid), uintptr(euid), uintptr(suid)); e1 != 0 {
|
|
err = errnoErr(e1)
|
|
}
|
|
} else if ret := cgocaller(cgo_libc_setresuid, uintptr(ruid), uintptr(euid), uintptr(suid)); ret != 0 {
|
|
err = errnoErr(Errno(ret))
|
|
}
|
|
return
|
|
}
|
|
|
|
var cgo_libc_setreuid unsafe.Pointer // non-nil if cgo linked.
|
|
|
|
func Setreuid(ruid, euid int) (err error) {
|
|
if cgo_libc_setreuid == nil {
|
|
if _, _, e1 := AllThreadsSyscall(sys_SETREUID, uintptr(ruid), uintptr(euid), 0); e1 != 0 {
|
|
err = errnoErr(e1)
|
|
}
|
|
} else if ret := cgocaller(cgo_libc_setreuid, uintptr(ruid), uintptr(euid)); ret != 0 {
|
|
err = errnoErr(Errno(ret))
|
|
}
|
|
return
|
|
}
|
|
|
|
var cgo_libc_setuid unsafe.Pointer // non-nil if cgo linked.
|
|
|
|
func Setuid(uid int) (err error) {
|
|
if cgo_libc_setuid == nil {
|
|
if _, _, e1 := AllThreadsSyscall(sys_SETUID, uintptr(uid), 0, 0); e1 != 0 {
|
|
err = errnoErr(e1)
|
|
}
|
|
} else if ret := cgocaller(cgo_libc_setuid, uintptr(uid)); ret != 0 {
|
|
err = errnoErr(Errno(ret))
|
|
}
|
|
return
|
|
}
|
|
|
|
//sys Setpriority(which int, who int, prio int) (err error)
|
|
//sys Setxattr(path string, attr string, data []byte, flags int) (err error)
|
|
//sys Sync()
|
|
//sysnb Sysinfo(info *Sysinfo_t) (err error)
|
|
//sys Tee(rfd int, wfd int, len int, flags int) (n int64, err error)
|
|
//sysnb Tgkill(tgid int, tid int, sig Signal) (err error)
|
|
//sysnb Times(tms *Tms) (ticks uintptr, err error)
|
|
//sysnb Umask(mask int) (oldmask int)
|
|
//sysnb Uname(buf *Utsname) (err error)
|
|
//sys Unmount(target string, flags int) (err error) = SYS_UMOUNT2
|
|
//sys Unshare(flags int) (err error)
|
|
//sys write(fd int, p []byte) (n 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
|
|
|
|
// mmap varies by architecture; see syscall_linux_*.go.
|
|
//sys munmap(addr uintptr, length uintptr) (err error)
|
|
|
|
var mapper = &mmapper{
|
|
active: make(map[*byte][]byte),
|
|
mmap: mmap,
|
|
munmap: munmap,
|
|
}
|
|
|
|
func Mmap(fd int, offset int64, length int, prot int, flags int) (data []byte, err error) {
|
|
return mapper.Mmap(fd, offset, length, prot, flags)
|
|
}
|
|
|
|
func Munmap(b []byte) (err error) {
|
|
return mapper.Munmap(b)
|
|
}
|
|
|
|
//sys Madvise(b []byte, advice int) (err error)
|
|
//sys Mprotect(b []byte, prot int) (err error)
|
|
//sys Mlock(b []byte) (err error)
|
|
//sys Munlock(b []byte) (err error)
|
|
//sys Mlockall(flags int) (err error)
|
|
//sys Munlockall() (err error)
|
|
|
|
// prlimit is accessed from x/sys/unix.
|
|
//go:linkname prlimit
|
|
|
|
// prlimit changes a resource limit. We use a single definition so that
|
|
// we can tell StartProcess to not restore the original NOFILE limit.
|
|
// This is unexported but can be called from x/sys/unix.
|
|
func prlimit(pid int, resource int, newlimit *Rlimit, old *Rlimit) (err error) {
|
|
err = prlimit1(pid, resource, newlimit, old)
|
|
if err == nil && newlimit != nil && resource == RLIMIT_NOFILE && (pid == 0 || pid == Getpid()) {
|
|
origRlimitNofile.Store(nil)
|
|
}
|
|
return err
|
|
}
|