linux-hardening - Re: [PATCH] s390/vfio-ap: Replace one-element array with flexible array member

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Message-ID: <20250130114615.6f591882.pasic@linux.ibm.com>
Date: Thu, 30 Jan 2025 11:46:15 +0100
From: Halil Pasic <pasic@...ux.ibm.com>
To: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc: Thorsten Blum <thorsten.blum@...ux.dev>,
        Tony Krowiak
 <akrowiak@...ux.ibm.com>,
        Jason Herne <jjherne@...ux.ibm.com>,
        Harald
 Freudenberger <freude@...ux.ibm.com>,
        Holger Dengler
 <dengler@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>, Vasily Gorbik
 <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian
 Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle
 <svens@...ux.ibm.com>, linux-hardening@...r.kernel.org,
        linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        Halil Pasic
 <pasic@...ux.ibm.com>
Subject: Re: [PATCH] s390/vfio-ap: Replace one-element array with flexible
 array member

On Thu, 30 Jan 2025 10:30:30 +1030
"Gustavo A. R. Silva" <gustavo@...eddedor.com> wrote:

> On 30/01/25 07:08, Halil Pasic wrote:
> > On Thu, 16 Jan 2025 14:18:59 +0100
> > Thorsten Blum <thorsten.blum@...ux.dev> wrote:
> >   
> >> Replace the deprecated one-element array with a modern flexible array
> >> member in the struct ap_matrix_dev.
> >>  
> > 
> > I'm not sure I understand the value of this. What we have here is not
> > a flexible array but a one element array. Something that in the generic
> > case could be many but particularly for vfio-ap is always one.  
> 
> You are correct. Only fake flexible arrays should be transformed into
> C99 flex-array members [1].
> 
> Thanks
> -Gustavo
> 
> [1] https://lwn.net/Articles/908817/
> 

Thanks! Alex, what do we do with this then? I think you picked it up
yesterday late. And I think, it might make sense to make this look
less like a fake flex-array...