This is the mail archive of the
cygwin
mailing list for the Cygwin project.
Re: [BUG 1.7] Read-only files are not.
- From: David Rothenberger <daveroth at acm dot org>
- To: cygwin at cygwin dot com
- Date: Wed, 31 Dec 2008 16:56:33 -0800
- Subject: Re: [BUG 1.7] Read-only files are not.
- References: <495C00DF.5020208@acm.org> <loom.20090101T000200-655@post.gmane.org>
- Reply-to: cygwin at cygwin dot com
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!
--
Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
Problem reports: http://cygwin.com/problems.html
Documentation: http://cygwin.com/docs.html
FAQ: http://cygwin.com/faq/