syscallcompat: hardcode maxReclen = 280 for all architectures

Due to padding between entries, it is 280 even on 32-bit architectures.
See https://github.com/rfjakob/gocryptfs/issues/197 for details.
libgocryptfs
Jakob Unterwurzacher 5 years ago
parent b318572312
commit f3838c09d8
  1. 9
      internal/syscallcompat/getdents_linux.go

@ -21,6 +21,11 @@ import (
const sizeofDirent = int(unsafe.Sizeof(syscall.Dirent{}))
// maxReclen sanity check: Reclen should never be larger than this.
// Due to padding between entries, it is 280 even on 32-bit architectures.
// See https://github.com/rfjakob/gocryptfs/issues/197 for details.
const maxReclen = 280
// getdents wraps syscall.Getdents and converts the result to []fuse.DirEntry.
func getdents(fd int) ([]fuse.DirEntry, error) {
// Collect syscall result in smartBuf.
@ -53,9 +58,9 @@ func getdents(fd int) ([]fuse.DirEntry, error) {
// EBADR = Invalid request descriptor
return nil, syscall.EBADR
}
if int(s.Reclen) > sizeofDirent {
if int(s.Reclen) > maxReclen {
tlog.Warn.Printf("Getdents: corrupt entry #%d: Reclen=%d > %d. Returning EBADR",
numEntries, s.Reclen, sizeofDirent)
numEntries, s.Reclen, maxReclen)
return nil, syscall.EBADR
}
offset += int(s.Reclen)

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