mirror of
https://github.com/minio/minio.git
synced 2024-12-24 06:05:55 -05:00
a8296445ad
Refactor the Dirent parsing code such that when we calculate offsets are correct based on the platform This PR fixes a silent potential crash on ARM architecture.
44 lines
1.3 KiB
Go
44 lines
1.3 KiB
Go
// +build linux,!appengine
|
|
|
|
/*
|
|
* MinIO Cloud Storage, (C) 2019 MinIO, Inc.
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
package cmd
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
"syscall"
|
|
"unsafe"
|
|
)
|
|
|
|
func direntNamlen(dirent *syscall.Dirent) (uint64, error) {
|
|
const fixedHdr = uint16(unsafe.Offsetof(syscall.Dirent{}.Name))
|
|
nameBuf := (*[unsafe.Sizeof(dirent.Name)]byte)(unsafe.Pointer(&dirent.Name[0]))
|
|
const nameBufLen = uint16(len(nameBuf))
|
|
limit := dirent.Reclen - fixedHdr
|
|
if limit > nameBufLen {
|
|
limit = nameBufLen
|
|
}
|
|
// Avoid bugs in long file names
|
|
// https://github.com/golang/tools/commit/5f9a5413737ba4b4f692214aebee582b47c8be74
|
|
nameLen := bytes.IndexByte(nameBuf[:limit], 0)
|
|
if nameLen < 0 {
|
|
return 0, fmt.Errorf("failed to find terminating 0 byte in dirent")
|
|
}
|
|
return uint64(nameLen), nil
|
|
}
|