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Date: Mon, 29 Jul 2013 15:48:22 +0200
Message-ID: <CANeJNHoYFeCeqm=jXK1EYEP99744twR2bzEC-MO=n0h6aB6jfA@mail.gmail.com>
Subject: Re: child (xterm) fork failure as it loads to different address
From: Ariel Burbaickij <ariel DOT burbaickij AT gmail DOT com>
To: cygwin AT cygwin DOT com
Content-Type: text/plain; charset=ISO-8859-1

OK, for the record: looks like rebasing did help quite a bit here.

/wbr
Ariel Burbaickij

On Mon, Jul 29, 2013 at 3:35 PM, Ryan Johnson
<ryan DOT johnson AT cs DOT utoronto DOT ca> wrote:
> http://cygwin.com/acronyms/#TOFU
>
>
> On 29/07/2013 8:15 AM, Ariel Burbaickij wrote:
>>
>> OK, thank, you, so usual suspects. Now, removing, antivirus and stuff
>> will not be possible in this particular environment but adjustments in
>> the configuration are well possible, provided I will be able to prove
>> to administrators that troubles, indeed, stem from antivirus and co.
>> Now, I see in the FAQ in 4.42 section that these troubles were traced
>> and attributed to antiviri programs. Any more details about how they
>> were traced exactly, so that I can re-trace them too and provide a
>> proof, if needed?
>
> The proof usually goes something like this:
>
> 1. People report fork() failures on the list, and a correlation is noted
> between those failures and presence of app/antivirus X.
> 2. It is confirmed (or at least considered highly probable) that X performs
> dll injection, the root cause of these sorts of fork() failures.
> 3. Somebody tries disabling/removing X and the fork() failures go away.
> 4. X gets added to BLODA and reports of fork() failures, not attributable to
> X, disappear from the list.
>
> Eventually the process repeats when Y appears.
>
> You could also try enabling BLODA detection [1] and see what turns up, or
> run the NirSoft DLL injection detector [2].
>
> [1] http://cygwin.com/ml/cygwin/2012-02/msg00797.html
> [2] http://www.nirsoft.net/utils/injected_dll.html
>
>
>> Now, this is for one thing. Another one, is the
>> possibility to run Windows 7 (in my case) or any Windows  OS, down to
>> and including NT in POSIX-compatible "mode".
>
> From www.cygwin.com:
>>
>> The Cygwin DLL currently works with all recent, commercially released x86
>> 32 bit and 64 bit versions of Windows, starting with Windows XP SP3.
>
> So no, Windows NT will not work. Neither will Win95/98/2000. Nor will XP
> SP1/SP2. But if your admins are really so worried about viruses, they won't
> let you run those ancient operating systems anyway, because MS no longer
> pushes security patches for them.
>
> Given that you seem to have your choice of OS, though, you might try 64-bit
> cygwin. The sheer amount of address space that becomes available, plus some
> careful design decisions for placement of cygwin-related dlls in that space,
> reduces the risk of fork failures considerably.
>
> I don't think anybody has reported a fork failure on cygwin64 yet (knock on
> wood). I recently migrated to 64-bit cygwin with a new Win7/64 install
> myself, and so far have not had to disable Windows Defender; the latter was
> a recurring source of trouble for my previous 32-bit cygwin install on
> Win7/64.
>
> If you can't get cygwin64 running, you may be able to convince your admins
> to whitelist cygwin apps with the AV solution; that has a small chance of
> stopping the dll injection and allowing fork() to succeed. Don't get your
> hopes up, though: most AV leave the dll injection in place even when
> completely disabled system-wide, and just tell the dlls not to do anything
> (other than stepping on cygwin's toes, of course).
>
>
>> Is this step expected to
>> solve or at least alleviate all or at least some the troubles about
>> the square peg of fork() into the round whole of Windows?
>
> cygwin64 may do that... downgrading your OS will not.
>
> Ryan
>
>
>
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