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go/internal/fastwalk/fastwalk_dirent_namlen_linux.go
Yuval Pavel Zholkover 5e66757b83 internal/fastwalk: don't cross Dirent.Reclen boundry while looking for NULL in parseDirEnt
Crossing Dirent.Reclen boundry was manifested in golang/go#28131 as garbaled filenames,
when Dirent.Name was not NULL terminated on FreeBSD due to a bug (parseDirEnt would find a NULL
in the following Dirent's Fileno/Reclen fields).

Only search for NULL on linux, when the Namlen field is available use it directly instead.

Updates golang/go#28131

Change-Id: I64090576c8bad2bd246d1561432bf73d5caee2a9
Reviewed-on: https://go-review.googlesource.com/c/141801
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2018-10-13 18:20:35 +00:00

25 lines
622 B
Go

// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build linux
// +build !appengine
package fastwalk
import (
"bytes"
"syscall"
"unsafe"
)
func direntNamlen(dirent *syscall.Dirent) uint64 {
const fixedHdr = uint16(unsafe.Offsetof(syscall.Dirent{}.Name))
nameBuf := (*[unsafe.Sizeof(dirent.Name)]byte)(unsafe.Pointer(&dirent.Name[0]))
nameLen := bytes.IndexByte(nameBuf[:dirent.Reclen-fixedHdr], 0)
if nameLen < 0 {
panic("failed to find terminating 0 byte in dirent")
}
return uint64(nameLen)
}