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Date: Wed, 11 Dec 2013 14:53:33 +0100
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: Problems with Cygwin symlinks on a TrueCrypt volume
Message-ID: <20131211135333.GC2527@calimero.vinschen.de>
Reply-To: cygwin AT cygwin DOT com
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References: <21153 DOT 56522 DOT 988000 DOT 401372 AT woitok DOT gmail DOT com> <20131206163331 DOT GA1266 AT calimero DOT vinschen DOT de>
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On Dec  6 17:33, Corinna Vinschen wrote:
> On Dec  6 15:18, Dr Rainer Woitok wrote:
> > Greetings,
> >=20
> > I just happened to stumble over the problem described below.
> >=20
> > Additional information:
> >=20
> >   - Windows Vista, patched this week.
> >=20
> >   - Cygwin updated this week.
> >=20
> >   - TrueCrypt downloaded and installed this week.
> > [...]
> > $ cd /g
> > $ ln -s . xx
> > $ ls -nl xx
> > lrwxrwxrwx 1 1002 513 1 2013-12-06 11:38 xx -> .
> > $ rm xx*
> > rm: cannot remove `xx': Permission denied
> > $ rm -f xx*
> > rm: cannot remove `xx': Permission denied
> > $ ls -nl xx*
> > lrwxrwxrwx 1 1002 513 1 2013-12-06 11:38 xx -> .
> > [...]
> > $ attrib -r 'g:\xx.lnk'
> > $ rm xx.lnk
> > $ ls -nl xx*
> > ls: cannot access xx*: No such file or directory
> > $=20
> > [...]
> > I really dont't know whether Windows  or TrueCrypt is incorrectly inter-
> > preting  the DOS ReadOnly attribute,  and thus  whose  fault this is.  I
> > would simply  suggest to change the code  of the  "rm" command so it ex-
> > plicitly removes  the DOS ReadOnly  attribute  before it unlinks any ob-
> > ject.
>=20
> Cygwin's unlink function already removes the R/O attribute if it exists,
> because the OS equivalent to the POSIX unlink function refuses to remove
> files with the R/O attribute set.  I assume there's some weirdness in the
> handling of the R/O attribute in TrueCrypt, but that's just speculation.
>=20
> What you can do to help this issue along:  The same as above, but run
> rm under strace:
>=20
>   $ strace -o rm.trace rm -f xx
>=20
> The -f flag drops the interactive prompt.  I added lots of debug output
> to the unlink functionality over time, so the rm.trace file should
> contain a lot of interesting details as to what's going wrong here.
> Just appand the rm.trace file to your next reply.

Per the strace your sent via PM (NtOpenFile after RtlSetCurrentTransaction
returns with STATUS_RM_NOT_ACTIVE), I created a patch which stops the
transaction if the following NtOpenFile returns with a certain set of
status codes and tries to call NtOpenFile again, outside of a
transaction.

I created a new snapshot with this patch.  Please give the latest
snapshot from http://cygwin.com/snapshots/ a try and report back.

Apart from that, there's a chance that this is a problem not related
to Cygwin's usage of a transaction on a TrueCrypt volume in the first
place.  Can you try the workaround from
http://support.microsoft.com/kb/948252 and see if that fixes the issue
with the release Cygwin DLL 1.7.27?


Thanks,
Corinna


--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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