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Date:	Mon, 10 Aug 2009 15:25:15 +0200
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: [1.7] cygwin allows writing to readonly files
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On Aug 10 17:19, Alexey Borzenkov wrote:
> Hi,
> 
> $ echo foo >test.txt
> $ chmod 0444 test.txt
> $ echo bar >test.txt
> 
> This succeeds, even though the file is readonly, and permissions don't
> allow writing to the file. What's even stranger is that other programs
> (i.e. Notepad and other editors) can't write to this file, because
> there are no writing permissions on the file. How does cygwin 1.7
> manages to bypass NT permissions in this case?
> 
> Currently this breaks ExtUtils::MakeMaker, because it expects readonly
> files not to be writable and test fails.

That's a bug in your testsuite.  I assume you're running the tests as
administrator, right?  Administrators have the right to write to all
files, even R/O files, according to POSIX rules.  Your test would fail
on Linux as well, if you're running it as root.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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