Cygwin making files inaccessible?

[Roland Schwingel]

Hi...

I have seen similar problems on my side, but could not knock them down 
100% reproducable to get a good recipe for debugging it. I got this best 
reproduceable if I generate a tar on linux with eg a windows .exe 
inside. and than untar it on cygwin.  Afterwards ACLs were broken. Not 
every time but frequently. When using windows Explorer I got a message 
like "Permissions are not sorted in the correct way" (in german) when I 
tried to see permissions. And afterwards they have been quite strange 
and files where not accessable / executable.

I have it with 3.x up to 3.3.4.

Roland

"Cygwin" <cygwin-bounces+roland.schwingel=onevision.de@cygwin.com> wrote 
on 07.02.2022 08:01:33:

 > From: "Andrey Repin" <anrdaemon@yandex.ru>
 > To: "Jay K" <jayk123@hotmail.com>, cygwin@cygwin.com
 > Date: 07.02.2022 08:05
 > Subject: Re: Cygwin making files inaccessible?
 > Sent by: "Cygwin" 
<cygwin-bounces+roland.schwingel=onevision.de@cygwin.com>
 >
 > Greetings, Jay K!
 >
 > > I looked at this a while. I tried various recent cygwin1.dlls as
 > there were two ACL changes recently.
 > > I tried building cygwin1.dll with those changes reverted, but
 > failed to build it.
 > > For one thing it took me a while to find shilka..it is in cocom,
 > but that wasn't the entire problem.
 >
 > > Eventually.. I noticed the behavior was not the same for every
 > > file/directory/volume. Sometimes it worked ok.
 > > Though I think the ACLs still get changed quite a bit: "full"
 > expands to "many".
 > > Of course it has worked plenty for me and everyone else.
 >
 > > Eventually I tried chmod -R 777 * and this seems to have worked.
 >
 > > I speculate that some "bad" Cygwin ACLs got created at some point.
 > >  And maybe cacls wasn't deleting them?? That parts seems wierd.
 > Maybe on directories?
 > > Possibly due to those two recent changes, or maybe user error, I 
don't know.
 >
 > This may happen outside Cygwin tree, when initial ACL's are set in some
 > interesting way.
 > One possible solution is to tweak /cygdrive mount point to include 
"noacl"
 > flag, deferring all ACL modifications to Windows.
 >
 > (Please bottom post in this list. Thank you.)
 >
 >
 > > From: Jay K
 > > Sent: Saturday, February 5, 2022 12:16 PM
 > > To: cygwin@cygwin.com <cygwin@cygwin.com>
 > > Subject: Cygwin making files inaccessible?
 > >
 > > Cygwin making files inaccessible?
 > > i.e. when Cygwin copies or writes to them, not random files.
 >
 > > C:\t>dir /s/b/a
 >
 > > C:\t>dir /q .
 >
 > > 02/05/2022  04:11 AM    <DIR>          BUILTIN\Administrators .
 > > 02/05/2022  04:11 AM    <DIR>          NT SERVICE\TrustedInsta..
 >
 > > C:\t>cacls .
 > > C:\t Everyone:(OI)(CI)F
 >
 > > C:\t>echo > 1.txt
 >
 > > C:\t>cacls 1.txt
 > > C:\t\1.txt Everyone:F
 >
 > > C:\t>copy 1.txt 2.txt
 > >         1 file(s) copied.
 >
 > > C:\t>cacls 2.txt
 > > C:\t\2.txt Everyone:F
 >
 > > C:\t>del 2.txt
 >
 > > C:\t>uname -a
 > > CYGWIN_NT-10.0-WOW DESKTOP-BCFUMJ4 3.3.4(0.341/5/3) 2022-01-31 19:
 > 31 i686 Cygwin
 >
 > > C:\t>cp 1.txt 2.txt
 >
 > > C:\t>which cp
 > > /usr/bin/cp
 >
 > > C:\t>cacls 2.txt
 > > C:\t\2.txt NULL SID:(DENY)(special access:)
 > >                     READ_CONTROL
 >
 > >            DESKTOP-BCFUMJ4\jay:(DENY)(special access:)
 > >                                FILE_READ_DATA
 > >                                FILE_READ_EA
 > >                                FILE_EXECUTE
 >
 > >            DESKTOP-BCFUMJ4\jay:(special access:)
 > >                                STANDARD_RIGHTS_ALL
 > >                                DELETE
 > >                                READ_CONTROL
 > >                                WRITE_DAC
 > >                                WRITE_OWNER
 > >                                SYNCHRONIZE
 > >                                STANDARD_RIGHTS_REQUIRED
 > >                                FILE_READ_ATTRIBUTES
 > >                                FILE_WRITE_ATTRIBUTES
 >
 > >            DESKTOP-BCFUMJ4\None:R
 > >            Everyone:R
 >
 >
 > > C:\t>more 1.txt
 > > ECHO is on.
 >
 > > C:\t>more 2.txt
 > > Cannot access file C:\t\2.txt
 >
 > > Same behavior from cygwin64.
 >
 > > C:\t>\cygwin64\bin\uname -a
 > > CYGWIN_NT-10.0 DESKTOP-BCFUMJ4 3.3.3(0.341/5/3) 2021-12-03 16:35
 > x86_64 Cygwin
 >
 > > Huh?
 >
 > > I would hope Cygwin could/would just copy the ACLs asis.
 > > I am guessing there is some failed attempt to translate them
 > > to an internal form and then back to NT form.
 >
 > > My real scenario was open/write/read, not cp.exe.
 >
 > >  - Jay
 >
 >
 >
 > --
 > With best regards,
 > Andrey Repin
 > Monday, February 7, 2022 9:59:12
 >
 > Sorry for my terrible english...
 >
 > --
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