From: David Rothenberger <daveroth@acm.org>
To: cygwin@cygwin.com
Subject: Re: [BUG 1.7] Read-only files are not.
Date: Thu, 01 Jan 2009 00:57:00 -0000 [thread overview]
Message-ID: <495C14C1.3090906@acm.org> (raw)
In-Reply-To: <loom.20090101T000200-655@post.gmane.org>
On 12/31/2008 4:06 PM, Eric Blake wrote:
> David Rothenberger <daveroth <at> acm.org> writes:
>
>> It seems that read-only files in Cygwin 1.7 are not truly
>> read-only.
>
> Are you perchance running as an Administrator, and therefore you have backup
> privileges?
Yes.
> If so, then you have root-like power, and cygwin exposes that by
> opening files with intent to backup even when the ACLs would otherwise make the
> file unreadable. Therefore, even though none of S_IRUSR, S_IRGRP, S_IROTH are
> set in the posixy st_mode bits, access(file, R_OK) returns 0 and open() is able
> to exploit your root-like powers to read that file.
>
> I thought Corinna mentioned this in the release notes.
I didn't see anything mentioned in this message:
http://cygwin.com/ml/cygwin-announce/2008-12/msg00009.html
>> (This issue was brought to my attention by a failing subversion test
>> after building for 1.7.)
>
> The findutils testsuite also had to make accomodations to skip certain tests
> when run with root-like privileges.
If this is indeed intended behavior, I will adjust the subversion test
cases accordingly.
--
David Rothenberger ---- daveroth@acm.org
pain, n.:
One thing, at least it proves that you're alive!
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next prev parent reply other threads:[~2009-01-01 0:57 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-31 23:32 David Rothenberger
2008-12-31 23:59 ` Christopher Faylor
2009-01-01 1:17 ` David Rothenberger
2009-01-01 0:07 ` Eric Blake
2009-01-01 0:57 ` David Rothenberger [this message]
2009-01-01 3:39 ` Christopher Faylor
2009-01-07 14:31 ` Corinna Vinschen
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