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Re: [ANNOUNCEMENT] TEST RELEASE: Cygwin 2.4.0-0.4
- From: Kacper Michajlow <kasper93 at gmail dot com>
- To: cygwin at cygwin dot com
- Date: Mon, 30 Nov 2015 01:43:01 +0100
- Subject: Re: [ANNOUNCEMENT] TEST RELEASE: Cygwin 2.4.0-0.4
- Authentication-results: sourceware.org; auth=none
- References: <CABPLASTKt3uKcAbeLNjVa89wrWi_LO6MnPD0Fd=T0FxJG0r5mA at mail dot gmail dot com> <20151126131633 dot GL2755 at calimero dot vinschen dot de> <CABPLASTpsNA4vGtONb14dQ87UV1gY=UAeHBgEXUmgztDeny_mg at mail dot gmail dot com> <CABPLASRpe+ey=dzuzkKYhu4UV=A10y9RkOzLxxA7v4o5CPtSag at mail dot gmail dot com> <20151128155421 dot GX2755 at calimero dot vinschen dot de> <CABPLASSAabDkMK8ZwF0Q+a1N7enDW5SwuPu3_rnAFNdNZqfXmw at mail dot gmail dot com> <1352387525 dot 20151129021637 at yandex dot ru> <20151129125921 dot GA2755 at calimero dot vinschen dot de> <CABPLASTWGXVXf+YVx5Uwp6wqZqBmWRmkrFdoKCPR30QEV+4BVA at mail dot gmail dot com> <20151129171043 dot GC2755 at calimero dot vinschen dot de> <20151129201458 dot GD2755 at calimero dot vinschen dot de>
2015-11-29 21:14 GMT+01:00 Corinna Vinschen <corinna-cygwin@cygwin.com>:
> On Nov 29 18:10, Corinna Vinschen wrote:
>> On Nov 29 15:10, Kacper Michajlow wrote:
>> > 2015-11-29 13:59 GMT+01:00 Corinna Vinschen <corinna-cygwin@cygwin.com>:
>> > > Status 0xC0000078 aka Win32 error 1337 means "invalid SID". And the
>> > > SID 1-5-32-1001 is in fact invalid. The S-1-5-32 prefix denotes a builtin
>> > > account, but the RID 1001 is invalid for a builtin group. 1001 is the
>> > > RID of your user account, though, but that would be prefixed by the SID
>> > > of your machine, which looks like S-1-5-21-XXXXXXXX-YYYYYYYY-ZZZZZZZZ.
>> > > I don't see how this broken SID came into life, unless your /etc/passwd
>> > > and/or /etc/group files are broken (hand edited perhaps?).
>> >
>> > I guess I only changed shell to zsh in /etc/passwd, but no other
>> > changes were made. So I have no idea how they could get corrupted
>> > either.
>>
>> They aren't. There is no 1-5-32-1001 SID in those files and both files
>> look entirely insuspicious. Given that Cygwin doesn't create any such
>> SID from scratch, I'm totally puzzled where this SID is coming from.
>> Your mkdir trace output doesn't show this SID anywhere else either.
>> This definitely requires more debugging...
>
> I think I found it. The problem was the handling of Microsoft Accounts
> on machines still using passwd and group files. And the additional
> group entry for the user with a gid different from the user's uid was
> required to uncover this problem. This is fortunately a border case,
> but the fix seemed to be simple so I applied it and added a comment
> so as not to forget why we have to do that.
>
>> > Works.
>>
>> Ok, that's good to know. Now I just have to find out where this
>> weird SID was created :-P
>
> That fall into place after I realized what was happening. The gid
> 1001 didn't exist in /etc/group so Cygwin calls the function to
> evaluate a SID from a computed UID/GID, and this in turn generated
> the invalid 1-5-32-1001 SID. WHile writing this I realized that
> I should harden this part of the code to accept only RIDs < 1000...
>
>> > I personally am fine with abandoning /etc/passwd and /etc/group. This
>> > is good enough solution for me. Though there might be other people
>> > with the same issue.
>>
>> This seems to be a bug in Cygwin, and with the content of your files I
>> finally managed to reproduce the issue. I'm planning to debug this next
>> week and, hopefully, come up with a patch. It would be nice if you
>> could do another test then in your environment :}
>
> I just uploaded new developer snapshots to https://cygwin.com/snapshots/
> and a new test release 2.4.0-0.6 with the aforementioned patch. Please
> give any of them a try.
I can confirm that the issue is fixed in 2.4.0-0.6. Thanks for great support!
-Kacper
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