My Cygwin installation has installation files owned by Unknown+User Unknown+Group, including the config dir

Question

I installed Cygwin a couple of weeks ago, but this morning when I needed to grep some PC files I opened the cygwin terminal and it reported that my config dir is unreadable. It's owned by Unknown+User and Unknown+Group.

-bash: cd: /cygdrive/c/WINDOWS/system32/config/systemprofile: Permission denied WARNING: Failed attempt to cd into /cygdrive/c/WINDOWS/system32/config/systemprofile!

 /cygdrive/c/WINDOWS/system32
$ ls -l|grep Unknown
drwxr-x---  1 Unknown+User                Unknown+Group                       0 Feb 19 09:26 config
drwxr-x---  1 Unknown+User                Unknown+Group                       0 Sep 15 03:33 Configuration
drwxr-x---  1 Unknown+User                Unknown+Group                       0 Sep 15 03:33 DriverState
drwxr-x---  1 Unknown+User                Unknown+Group                       0 Sep 15 03:33 FxsTmp
drwxr-x---  1 Unknown+User                Unknown+Group                       0 Sep 15 03:34 ias
drwxr-x---  1 Unknown+User                Unknown+Group                       0 Sep 15 03:34 MsDtc
drwxr-x---  1 Unknown+User                Unknown+Group                       0 Sep 15 03:33 networklist
-rwxr-x---+ 1 Administrators              Unknown+Group                  137570 Feb 19 09:23 perfc009.dat
-rwxr-x---+ 1 Administrators              Unknown+Group                   33424 Sep 15 03:31 perfd009.dat
-rwxr-x---+ 1 Administrators              Unknown+Group                  716204 Feb 19 09:23 perfh009.dat
-rwxr-x---+ 1 Administrators              Unknown+Group                  297062 Sep 15 03:31 perfi009.dat
drwxr-x---  1 Unknown+User                Unknown+Group                       0 Feb 19 10:18 SleepStudy
drwxr-x---  1 Unknown+User                Unknown+Group                       0 Feb 19 11:21 sru
drwxr-x---  1 Unknown+User                Unknown+Group                       0 Feb 19 09:37 WDI

(As an aside, because it could be relevant, this PC just went through the upgrade to the rather horrible Windows 10 Update 1809 and a follow-up update. This caused a couple of problems, like bad audio and wifi drivers.)

What do I need to do to fix this?

Edit: I don't think the PC is part of a domain, but I don't know. id: uid=197611(sinc) gid=197121(None) groups=197121(None),545(Users),4(INTERACTIVE),66049(CONSOLE LOGON),11(Authenticated Users),15(This Organization),113(Local account),4095(CurrentSession),66048(LOCAL),262154(NTLM Authentication),401408(Medium Mandatory Level)

Answer 1

You can not fix as it is a Windows issue not a cygwin issue. The owner of those files is readable only from a Administrator account.

The same problem is available from Power Shell, the error reports a lack of authorisation

Windows PowerShell
Copyright (C) Microsoft Corporation. Alle Rechte vorbehalten.

PS C:\windows\system32> get-acl config
get-acl : Es wurde versucht, einen nicht autorisierten Vorgang auszuführen.
In Zeile:1 Zeichen:1
+ get-acl config

But if PowerShell is RunAs Administrator

Windows PowerShell
Copyright (C) Microsoft Corporation. Alle Rechte vorbehalten.

PS C:\WINDOWS\system32> get-acl config

    Verzeichnis: C:\WINDOWS\system32

Path   Owner               Access
----   -----               ------
config NT-AUTORITÄT\SYSTEM ERSTELLER-BESITZER Allow  FullControl...

And from Cygwin Shell RunAs Administrator

 /cygdrive/c/windows/system32
$ ls -ld config
drwxrwx---+ 1 SYSTEM SYSTEM 0 Feb 16 07:38 config