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Subject: Re: [SECURITY] FDs 0, 1, 2 for SUID/SGID programs
To: Weimer@CERT.Uni-Stuttgart.DE (Florian Weimer)
Date: Tue, 23 Apr 2002 10:04:20 +0100 (BST)
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <87662jiz3b.fsf@CERT.Uni-Stuttgart.DE> from "Florian Weimer" at Apr 22, 2002 04:31:52 PM
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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
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> http://www.pine.nl/advisories/pine-cert-20020401.html probably affects
> Linux, too (if a SUID/SGID program is invoked with FD 2 closed, error
> messages might be written to a file opened by the program ).

Unix requires this behaviour. Its an old and common bug to get it
wrong. glibc intentionally provides some cover
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