linux-hardening - Re: [PATCH] KVM: PPC: Replace zero-length array with flexible array member

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Date:   Wed, 20 Oct 2021 18:28:49 -0500
From:   "Gustavo A. R. Silva" <gustavoars@...nel.org>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     Len Baker <len.baker@....com>, Paul Mackerras <paulus@...abs.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Kees Cook <keescook@...omium.org>, kvm-ppc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-hardening@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM: PPC: Replace zero-length array with flexible array
 member

On Mon, Sep 20, 2021 at 07:05:07PM -0500, Gustavo A. R. Silva wrote:
> 
> 
> On 9/18/21 09:21, Len Baker wrote:
> > There is a regular need in the kernel to provide a way to declare having
> > a dynamically sized set of trailing elements in a structure. Kernel code
> > should always use "flexible array members" [1] for these cases. The
> > older style of one-element or zero-length arrays should no longer be
> > used[2].
> > 
> > Also, make use of the struct_size() helper in kzalloc().
> > 
> > [1] https://en.wikipedia.org/wiki/Flexible_array_member
> > [2] https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays
> > 
> > Signed-off-by: Len Baker <len.baker@....com>
> 
> Reviewed-by: Gustavo A. R. Silva <gustavoars@...nel.org>

I'm taking this in my -next tree.

Thanks
--
Gustavo