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syscall: swap src, dest arguments in convertFromDirents11 for FreeBSD
make fixedSize, oldFixedSize constants. use st instead of stat for function arg so that we do not shadow the stat() function. dstPos+reclen == len(buf) is a valid write location, update the break condition. Change-Id: I55f9210f54d24a3f9cda1ebab52437436254f8f4 Reviewed-on: https://go-review.googlesource.com/c/143637 Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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12
src/syscall/export_freebsd_test.go
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12
src/syscall/export_freebsd_test.go
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@ -0,0 +1,12 @@
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// Copyright 2018 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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package syscall
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type Dirent_freebsd11 = dirent_freebsd11
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var (
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Roundup = roundup
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ConvertFromDirents11 = convertFromDirents11
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)
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@ -223,31 +223,31 @@ func Fstat(fd int, st *Stat_t) (err error) {
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return nil
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}
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func Statfs(path string, stat *Statfs_t) (err error) {
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func Statfs(path string, st *Statfs_t) (err error) {
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var oldStatfs statfs_freebsd11_t
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if supportsABI(_ino64First) {
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return statfs_freebsd12(path, stat)
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return statfs_freebsd12(path, st)
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}
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err = statfs(path, &oldStatfs)
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if err != nil {
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return err
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}
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stat.convertFrom(&oldStatfs)
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st.convertFrom(&oldStatfs)
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return nil
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}
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func Fstatfs(fd int, stat *Statfs_t) (err error) {
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func Fstatfs(fd int, st *Statfs_t) (err error) {
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var oldStatfs statfs_freebsd11_t
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if supportsABI(_ino64First) {
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return fstatfs_freebsd12(fd, stat)
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return fstatfs_freebsd12(fd, st)
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}
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err = fstatfs(fd, &oldStatfs)
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if err != nil {
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return err
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}
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stat.convertFrom(&oldStatfs)
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st.convertFrom(&oldStatfs)
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return nil
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}
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@ -262,7 +262,7 @@ func Getdirentries(fd int, buf []byte, basep *uintptr) (n int, err error) {
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oldBuf := make([]byte, oldBufLen)
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n, err = getdirentries(fd, oldBuf, basep)
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if err == nil && n > 0 {
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n = convertFromDirents11(oldBuf[:n], buf)
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n = convertFromDirents11(buf, oldBuf[:n])
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}
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return
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}
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@ -344,17 +344,20 @@ func (s *Statfs_t) convertFrom(old *statfs_freebsd11_t) {
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copy(s.Mntonname[:], old.Mntonname[:n])
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}
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func convertFromDirents11(old []byte, buf []byte) int {
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oldFixedSize := int(unsafe.Offsetof((*dirent_freebsd11)(nil).Name))
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fixedSize := int(unsafe.Offsetof((*Dirent)(nil).Name))
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srcPos := 0
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func convertFromDirents11(buf []byte, old []byte) int {
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const (
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fixedSize = int(unsafe.Offsetof(Dirent{}.Name))
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oldFixedSize = int(unsafe.Offsetof(dirent_freebsd11{}.Name))
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)
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dstPos := 0
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srcPos := 0
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for dstPos+fixedSize < len(buf) && srcPos+oldFixedSize < len(old) {
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srcDirent := (*dirent_freebsd11)(unsafe.Pointer(&old[srcPos]))
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dstDirent := (*Dirent)(unsafe.Pointer(&buf[dstPos]))
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srcDirent := (*dirent_freebsd11)(unsafe.Pointer(&old[srcPos]))
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reclen := roundup(fixedSize+int(srcDirent.Namlen)+1, 8)
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if dstPos+reclen >= len(buf) {
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if dstPos+reclen > len(buf) {
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break
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}
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54
src/syscall/syscall_freebsd_test.go
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54
src/syscall/syscall_freebsd_test.go
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@ -0,0 +1,54 @@
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// Copyright 2018 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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// +build freebsd
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package syscall_test
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import (
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"fmt"
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"syscall"
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"testing"
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"unsafe"
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)
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func TestConvertFromDirent11(t *testing.T) {
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const (
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filenameFmt = "%04d"
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numFiles = 64
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fixedHdrSize = int(unsafe.Offsetof(syscall.Dirent_freebsd11{}.Name))
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)
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namlen := len(fmt.Sprintf(filenameFmt, 0))
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reclen := syscall.Roundup(fixedHdrSize+namlen+1, 4)
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old := make([]byte, numFiles*reclen)
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for i := 0; i < numFiles; i++ {
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dent := syscall.Dirent_freebsd11{
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Fileno: uint32(i + 1),
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Reclen: uint16(reclen),
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Type: syscall.DT_REG,
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Namlen: uint8(namlen),
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}
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rec := make([]byte, reclen)
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copy(rec, (*[fixedHdrSize]byte)(unsafe.Pointer(&dent))[:])
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copy(rec[fixedHdrSize:], fmt.Sprintf(filenameFmt, i+1))
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copy(old[i*reclen:], rec)
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}
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buf := make([]byte, 2*len(old))
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n := syscall.ConvertFromDirents11(buf, old)
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names := make([]string, 0, numFiles)
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_, _, names = syscall.ParseDirent(buf[:n], -1, names)
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if len(names) != numFiles {
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t.Errorf("expected %d files, have %d; names: %q", numFiles, len(names), names)
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}
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for i, name := range names {
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if expected := fmt.Sprintf(filenameFmt, i+1); name != expected {
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t.Errorf("expected names[%d] to be %q; got %q", i, expected, name)
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}
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}
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}
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