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Date:	Thu, 26 Mar 2020 21:05:48 +0100
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: WSL symbolic links
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On Mar 26 13:12, Brian Inglis wrote:
> On 2020-03-26 05:00, Corinna Vinschen wrote:
> > On Mar 26 10:00, Thomas Wolff wrote:
> >> A symbolic link created with WSL is neither interpreted in cygwin nor =
can it
> >> be deleted:
> >>> touch file
> >>> wsl ln -s file link
> >>> wsl ls -l link
> >> lrwxrwxrwx=C2=A0=C2=A0=C2=A0 1 towo=C2=A0=C2=A0=C2=A0=C2=A0 towo=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 1 Mar 26=
 08:56 link -> file
> >>> ls -l link
> >> -rw-r----- 1 Unknown+User Unknown+Group 0 Mar 26 00:00 link
> > What kind of file are they in the real world?  Reparse points?  If so,
> > what content do they have?  I attached a Q&D source from my vault
> > of old test apps to check on reparse point content.  Please compile with
> >   gcc -g ../src/rd-reparse.c -o rd-reparse -lntdll
> > It takes a single native NT path as parameter, kind of like this:
> >   ./rd-reparse '\??\C:\cygwin64\home\corinna\link'
>=20
> They should be WSL or Windows mklink (soft) links, and the reason why mkl=
ink was
> allowed unelevated in Windows 10 with Developer mode.
>=20
> In an *elevated* shell:
>=20
> $ ls -dln u
> -rw-r----- 1 4294967295 4294967295 0 Nov  9 06:09 u
               ^^^^^^^^^^^^^^^^^^^^^
This is unknown user, unknown group, which means, the Windows
function LookupAccountSid() probably returned a domain name which
is unknown (neither account domain, nor primary, nor trusted domain).

An strace of `ls -l u' may be helpful...

> $ getfacl u
> getfacl: u: Permission denied
> $ icacls u
> u NULL SID:(DENY)(Rc,S,REA,WEA,X,DC)
>   $HOSTNAME\$USER:(F)
    ^^^^^^^^^^^^^^^
    Is that the *real* output, or did you tamper with it?


Thanks,
Corinna

--=20
Corinna Vinschen
Cygwin Maintainer

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