[PATCH v2] libio: Add test for fopen with an empty ", ccs=" value [BZ #34574]

[Florian Weimer]

* Adhemerval Zanella Netto:

> On 04/09/26 09:51, Florian Weimer wrote:
>> * Shamil Abdulaev:
>> 
>>> This goes on top of the fix for CVE-2026-18374.  The test runs the
>>> reproducer from the bug report, plus "w,ccs=" and "w,ccs=,", and
>>> expects NULL with errno set to EINVAL.
>>>
>>> Signed-off-by: Shamil Abdulaev <ashamil435@gmail.com>
>> 
>> New version is okay.
>> 
>> Reviewed-by: Florian Weimer <fweimer@redhat.com>
> This new test triggers a CI failure [1].
>
> [1] https://patchwork.sourceware.org/project/glibc/patch/c0f916545dc702fe6381758f927c3e9f14203bc6.1788455957.git.ashamil435@gmail.com/

I believe that's because it wasn't tested along with the separately
submitted fix.

Thanks,
Florian