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Re: [1.7] cygwin allows writing to readonly files
- From: Corinna Vinschen <corinna-cygwin at cygwin dot com>
- To: cygwin at cygwin dot com
- Date: Mon, 10 Aug 2009 15:25:15 +0200
- Subject: Re: [1.7] cygwin allows writing to readonly files
- References: <e2480c70908100619m906f5dfj794823f22c7604bc@mail.gmail.com>
- Reply-to: cygwin at cygwin dot com
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
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Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Project Co-Leader cygwin AT cygwin DOT com
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