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Date: Wed, 11 Oct 2023 09:22:29 -0400
From: Jason Andryuk <>
To: "Gustavo A. R. Silva" <>
Cc: Juergen Gross <>, Stefano Stabellini <>, 
	Oleksandr Tyshchenko <>,,,
Subject: Re: [PATCH][next] xen/xenbus: Add __counted_by for struct read_buffer
 and use struct_size()

On Mon, Oct 9, 2023 at 2:55 PM Gustavo A. R. Silva
<> wrote:
> Prepare for the coming implementation by GCC and Clang of the __counted_by
> attribute. Flexible array members annotated with __counted_by can have
> their accesses bounds-checked at run-time via CONFIG_UBSAN_BOUNDS (for
> array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
> functions).
> While there, use struct_size() helper, instead of the open-coded
> version, to calculate the size for the allocation of the whole
> flexible structure, including of course, the flexible-array member.
> This code was found with the help of Coccinelle, and audited and
> fixed manually.
> Signed-off-by: Gustavo A. R. Silva <>

Reviewed-by: Jason Andryuk <>

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