linux-hardening - Re: [PATCH][next] treewide: uapi: Replace zero-length arrays with flexible-array members

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Message-ID: <20220628184404.GS23621@ziepe.ca>
Date:   Tue, 28 Jun 2022 15:44:04 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Kees Cook <keescook@...omium.org>
Cc:     Daniel Borkmann <daniel@...earbox.net>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
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Subject: Re: [PATCH][next] treewide: uapi: Replace zero-length arrays with
 flexible-array members

On Tue, Jun 28, 2022 at 10:54:58AM -0700, Kees Cook wrote:

 
> which must also be assuming it's a header. So probably better to just
> drop the driver_data field? I don't see anything using it (that I can
> find) besides as a sanity-check that the field exists and is at the end
> of the struct.

The field is guaranteeing alignment of the following structure. IIRC
there are a few cases that we don't have a u64 already to force this.

Jason