[1.7] cygwin allows writing to readonly files

[Dave Korn]

Alexey Borzenkov wrote:
> On Mon, Aug 10, 2009 at 8:11 PM, Alexey Borzenkov<snaury@gmail.com> wrote:
>> Anyway, it means there is a bug in perl, because on Linux:
> 
> On second though, it is actually bug in Cygwin. Programs and libraries expect
> superuser behavior only when user id is zero, which is clearly not the case
> in Cygwin 1.7.

http://www.opengroup.org/onlinepubs/000095399/xrat/xbd_chap03.html

> Superuser*
> 
> This concept, with great historical significance to UNIX system users, has
> been replaced with the notion of appropriate privileges.

  This would seem to imply that it is permitted for there to be users other than
uid 0 with "appropriate" privileges.  Programs should not be trying to
second-guess the OS about the privs of a uid, they should ask the access()
function and find out.

    cheers,
      DaveK

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