mirror of
https://github.com/rocky-linux/peridot.git
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60 lines
1.7 KiB
Go
60 lines
1.7 KiB
Go
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//go:build linux
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// Copyright (C) 2024 SUSE LLC. 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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package securejoin
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import (
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"os"
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"path/filepath"
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"golang.org/x/sys/unix"
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)
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func dupFile(f *os.File) (*os.File, error) {
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fd, err := unix.FcntlInt(f.Fd(), unix.F_DUPFD_CLOEXEC, 0)
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if err != nil {
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return nil, os.NewSyscallError("fcntl(F_DUPFD_CLOEXEC)", err)
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}
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return os.NewFile(uintptr(fd), f.Name()), nil
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}
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func openatFile(dir *os.File, path string, flags int, mode int) (*os.File, error) {
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// Make sure we always set O_CLOEXEC.
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flags |= unix.O_CLOEXEC
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fd, err := unix.Openat(int(dir.Fd()), path, flags, uint32(mode))
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if err != nil {
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return nil, &os.PathError{Op: "openat", Path: dir.Name() + "/" + path, Err: err}
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}
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// All of the paths we use with openatFile(2) are guaranteed to be
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// lexically safe, so we can use path.Join here.
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fullPath := filepath.Join(dir.Name(), path)
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return os.NewFile(uintptr(fd), fullPath), nil
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}
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func fstatatFile(dir *os.File, path string, flags int) (unix.Stat_t, error) {
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var stat unix.Stat_t
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if err := unix.Fstatat(int(dir.Fd()), path, &stat, flags); err != nil {
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return stat, &os.PathError{Op: "fstatat", Path: dir.Name() + "/" + path, Err: err}
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}
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return stat, nil
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}
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func readlinkatFile(dir *os.File, path string) (string, error) {
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size := 4096
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for {
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linkBuf := make([]byte, size)
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n, err := unix.Readlinkat(int(dir.Fd()), path, linkBuf)
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if err != nil {
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return "", &os.PathError{Op: "readlinkat", Path: dir.Name() + "/" + path, Err: err}
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}
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if n != size {
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return string(linkBuf[:n]), nil
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}
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// Possible truncation, resize the buffer.
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size *= 2
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}
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}
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