X-Recipient: archive-cygwin@delorie.com X-SWARE-Spam-Status: No, hits=-6.8 required=5.0 tests=AWL,BAYES_00,RCVD_IN_DNSWL_HI,SPF_HELO_PASS,T_RP_MATCHES_RCVD X-Spam-Check-By: sourceware.org Message-ID: <4C59BA9F.8050505@redhat.com> Date: Wed, 04 Aug 2010 13:08:15 -0600 From: Eric Blake User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.7) Gecko/20100720 Fedora/3.1.1-1.fc13 Lightning/1.0b2pre Mnenhy/0.8.3 Thunderbird/3.1.1 MIME-Version: 1.0 To: cygwin@cygwin.com Subject: Re: incompatible environment variable names References: <2BF01EB27B56CC478AD6E5A0A28931F20130250E@A1DAL1SWPES19MB.ams.acs-inc.net> In-Reply-To: <2BF01EB27B56CC478AD6E5A0A28931F20130250E@A1DAL1SWPES19MB.ams.acs-inc.net> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------enig20AEAC9C5765AF6C7B9EE499" X-IsSubscribed: yes Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com Delivered-To: mailing list cygwin@cygwin.com --------------enig20AEAC9C5765AF6C7B9EE499 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 08/04/2010 12:59 PM, Nellis, Kenneth wrote: >> From: Steven Collins >> On Wed, Aug 4, 2010 at 10:23, Nellis, Kenneth wrote: >>> I came across an interesting (IMHO) incompatibility between >>> Windows and bash environment variable names. Not just windows, but any system with environment variables. Anyone can call execve and set arbitrary strings in the environment that do not correspond to valid environment variables in the shell. Bash can inherit such invalid names, at which point, POSIX says that bash may, but not must, preserve those invalid names to pass on to children, even though they cannot be accessed from within the shell itself. >=20 > Well, *somehow* it got into the Cygwin environment, and cygwin.bat direct= ly > invokes bash, so I interpret this as bash creating the Cygwin environment. > Where is the hole in this logic? Bash does not create the cygwin environment. Rather, it inherits the environment from the parent process. --=20 Eric Blake eblake@redhat.com +1-801-349-2682 Libvirt virtualization library http://libvirt.org --------------enig20AEAC9C5765AF6C7B9EE499 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.14 (GNU/Linux) Comment: Public key at http://people.redhat.com/eblake/eblake.gpg Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org/ iQEcBAEBCAAGBQJMWbqfAAoJEKeha0olJ0NqlysIAISyhBQ7I6kVhooe6H4wV2QT cqPrYIbpWx4BKHTTRVmU7d4G+DbZmnmhmOUqNntnsq4VWKVEpAEyohRZN7FpZWqE NaTgDacevw9fpXryg5pdqOAVdhiR4q+UbBP9FQyXj/wUJZkZR0BSBYAep2wxR8wE 0Syjxm3/OFSZtC4xcSL13Iu+oEqGcTPhwdpUH3LluvmRgp7rfYpZXChN7MSy3Kfc YDKWkEWSzCZkRxSWNvf0HbhxtLmvtCtaX1BoTTun97lBNmhOXs/o5WyLtF47IOWj OeVdTdP6+TorgPlGzdz4/inXxEzXiqoQmeX/DOQdMT8A6eCYfLvEaFET3Lqgl94= =E6cW -----END PGP SIGNATURE----- --------------enig20AEAC9C5765AF6C7B9EE499--