DMARC-Filter:	OpenDMARC Filter v1.4.2 delorie.com 53O6gKw22618270
Authentication-Results:	delorie.com; dmarc=pass (p=none dis=none) header.from=cygwin.com
Authentication-Results:	delorie.com; spf=pass smtp.mailfrom=cygwin.com
DKIM-Filter:	OpenDKIM Filter v2.11.0 delorie.com 53O6gKw22618270
Authentication-Results:	delorie.com;
	dkim=pass (1024-bit key, unprotected) header.d=cygwin.com header.i=@cygwin.com header.a=rsa-sha256 header.s=default header.b=FvUFcaNU
X-Recipient:	archive-cygwin AT delorie DOT com
DKIM-Filter:	OpenDKIM Filter v2.11.0 sourceware.org A42F4385780C
DKIM-Signature:	v=1; a=rsa-sha256; c=relaxed/relaxed; d=cygwin.com;
	s=default; t=1745476938;
	bh=WFulHfdZYXGwd6cCsBAHVxjuAdlT4AZw7edlpBL8TdI=;
	h=Date:Subject:To:References:In-Reply-To:List-Id:List-Unsubscribe:
	List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To:
	From;
	b=FvUFcaNUH08xnoDEJ+B8EvzMlZyIiMmz75M+SkURjgcCwNnfvaxzgwGZxZgmeVFXB
	YccfW3IuhMA+cCnMHzedGmz+A9Kv0UTCELADvAYUGIO11OrM4PKBicu4fH74GpaApQ
	FShWEEKj1fhQerqiEsROO4PkGzmMj7sLI1YS3cLw=
X-Original-To:	cygwin AT cygwin DOT com
Delivered-To:	cygwin AT cygwin DOT com
DMARC-Filter:	OpenDMARC Filter v1.4.2 sourceware.org 77B6A3858D26
ARC-Filter:	OpenARC Filter v1.0.0 sourceware.org 77B6A3858D26
ARC-Seal:	i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1745476912; cv=none;
	b=b+8XO0dO99CrDNESvd475wfsfhSYTxxLv0BemZbqvFKnD90mylNGd7kfis0IxEi5HXDbBZPELy9nHQnskNa8+a8Y4m1ku52SfJYc5TzM+0DawdRNB0Ay6Ill7Eo5C/gS1ijK4RoyIjkeqQ7f95h4DxGwLjljGzhU3td8pes/YWY=
ARC-Message-Signature:	i=1; a=rsa-sha256; d=sourceware.org; s=key;
	t=1745476912; c=relaxed/simple;
	bh=HocvfHQNWFxShhu3qNv0Oe0ImXJDCz4NoV+9K6aoVxQ=;
	h=Message-ID:Date:MIME-Version:Subject:To:From;
	b=XOflZYxTV7JZ3JplE8bCBlAqXykoJMZh7weNmLMKX7VOysmhKW5BdB0GMDzD7NCPjXsycHZPDn6VyIGZvt8Q1fvOmhge8Xm7eVqO7AOWdi8/L6ULZ0nHoNX13nYnzfh8xpnmgMM2CAf2MbKh+rEkeSW7vMpP9oKbhPJdZMtCioY=
ARC-Authentication-Results:	i=1; server2.sourceware.org
DKIM-Filter:	OpenDKIM Filter v2.11.0 sourceware.org 77B6A3858D26
Message-ID:	<1ec4a4d8-69eb-4b6f-8216-d9248b338815@maxrnd.com>
Date:	Wed, 23 Apr 2025 23:41:57 -0700
MIME-Version:	1.0
User-Agent:	Mozilla Thunderbird
Subject:	Re: cygstart: buffer overflow when a URI is passed
	(cygutils-1.4.17-[23])
To:	cygwin AT cygwin DOT com
References:	<502f1b04-bc0e-4aba-b150-7b9ea3c5ba3b AT gmail DOT com>
	<aa2914e5-9a39-cc64-09b0-4fb4563a8706 AT t-online DOT de>
	<7850c4a6-2683-43f9-9d3b-6f4c164b2cb6 AT maxrnd DOT com>
	<172cbec2-4f19-4bc3-b501-c5ffede1e11a AT maxrnd DOT com>
	<cb4802e0-8c74-847d-d48e-2018de870815 AT t-online DOT de>
In-Reply-To:	<cb4802e0-8c74-847d-d48e-2018de870815@t-online.de>
X-BeenThere:	cygwin AT cygwin DOT com
X-Mailman-Version:	2.1.30
List-Id:	General Cygwin discussions and problem reports <cygwin.cygwin.com>
List-Unsubscribe:	<https://cygwin.com/mailman/options/cygwin>,
	<mailto:cygwin-request AT cygwin DOT com?subject=unsubscribe>
List-Archive:	<https://cygwin.com/pipermail/cygwin/>
List-Post:	<mailto:cygwin AT cygwin DOT com>
List-Help:	<mailto:cygwin-request AT cygwin DOT com?subject=help>
List-Subscribe:	<https://cygwin.com/mailman/listinfo/cygwin>,
	<mailto:cygwin-request AT cygwin DOT com?subject=subscribe>
From:	Mark Geisert via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	Mark Geisert <mark AT maxrnd DOT com>
Errors-To:	cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com
Sender:	"Cygwin" <cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com>
X-MIME-Autoconverted:	from base64 to 8bit by delorie.com id 53O6gKw22618270

On 4/23/2025 3:59 AM, Christian Franke via Cygwin wrote:
> Mark Geisert via Cygwin wrote:
>> Drat, typo alert:
>>
>>> It looks to me like that 'if' statement should read
>>>    if (mbstowcs (*wcs_path, *mbs_path, len) ...
>>
>>     if (mbstowcs (*wcspath, mbs_path, len) ...
>>
> 
> Use 'len + 1', otherwise the result would possibly be not null terminated.
> 
> POSIX says: "The array shall not be zero-terminated if the value 
> returned is /n/.".
> Linux mbstowcs(3) says: "... the programmer should make sure dsize is 
> greater than or equal to mbstowcs(NULL,src,0)+1."
> 
> Example:
[...]

Thank you for the demonstration code. I was actually asking about 
something more subtle in the cygstart code but muffed that with typos; 
you've answered that question as well :).

A new version 1.4.17-4 of the cygutils packages with a corrected 
'cygstart' is now making its way to the mirrors.
Thanks all,

..mark

-- 
Problem reports:      https://cygwin.com/problems.html
FAQ:                  https://cygwin.com/faq/
Documentation:        https://cygwin.com/docs.html
Unsubscribe info:     https://cygwin.com/ml/#unsubscribe-simple

- Raw text -