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Message-ID:	<2b2ab41b-f430-4d5e-9cc3-3d498a79c448@maxrnd.com>
Date:	Mon, 21 Apr 2025 01:34:46 -0700
MIME-Version:	1.0
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Subject:	Re: cygstart: buffer overflow when a URI is passed
	(cygutils-1.4.17-[23])
To:	cygwin AT cygwin DOT com
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From:	Mark Geisert via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	Mark Geisert <mark AT maxrnd DOT com>
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X-MIME-Autoconverted:	from base64 to 8bit by delorie.com id 53L8a23X876842

Hi Christian,

On 4/12/2025 9:37 AM, Christian Franke via Cygwin wrote:
> ggl329 via Cygwin wrote:
>> Hi all,
>>
>> I've encountered a possible bug in cygstart.
>> It seems to abort when a URI is passed to it.
>>
>>
>> $ cygcheck -dc | grep cygutils
>> cygutils                                1.4.17-3
>> $ cygstart https://www.google.com
>> *** buffer overflow detected ***: terminated
>> Aborted
> 
> Possibly no regression but longstanding bug which is now detected thanks 
> to gcc12's __builtin_dynamic_object_size() feature and -D_FORTIFY_SOURCE=3:
> 
> cygstart.c:
> 
> cygstart_mbs_to_wcs (const char *mbs_path, wchar_t **wcs_path)
> {
>    ...
>    *wcs_path = (wchar_t *) malloc ((len + 1) * sizeof (wchar_t));
>    ...
>    // *** buffer overflow detected *** because the length parameter
>    // should specify the number of characters instead of bytes:
>    if (mbstowcs (*wcs_path, mbs_path, (len + 1) * sizeof (wchar_t)) ...
>    ...
> }

Apologies for the delayed response.  Thanks ggl329 for the report and 
you for the diagnosis!  I will look into repairing this bug shortly.
Regards,

..mark

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