Mail Archives: cygwin/2008/12/31/22:39:46
On Thu, Jan 01, 2009 at 12:06:40AM +0000, 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.
>>The sequence of steps below shows that "chmod 444 file1" does not make
>>the file read-only in Cygwin 1.7, while it does in Cygwin 1.5. It may
>>have something to do with the Read Only DOS attribute. This is set by
>>Cygwin 1.5 but not by Cygwin 1.7. If I manually set it for Cygwin 1.7,
>>the file does become read-only.
>
>Are you perchance running as an Administrator, and therefore you have
>backup privileges? 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.
Ah, right. I remember when Corinna removed the "DOS" read-only bit.
I am running with Administrator privileges so I guess this behavior
makes sense.
cgf
--
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/
- Raw text -