linux-hardening - Re: [PATCH v3 2/2] igb: Proactively round up to kmalloc bucket size

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Date:   Fri, 28 Oct 2022 20:17:34 -0700
From:   Kees Cook <keescook@...omium.org>
To:     "Ruhl, Michael J" <michael.j.ruhl@...el.com>
Cc:     Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH v3 2/2] igb: Proactively round up to kmalloc bucket size

On Tue, Oct 18, 2022 at 02:25:25AM -0700, Kees Cook wrote:
> In preparation for removing the "silently change allocation size"
> users of ksize(), explicitly round up all q_vector allocations so that
> allocations can be correctly compared to ksize().
>
> Signed-off-by: Kees Cook <keescook@...omium.org>

Hi! Any feedback on this part of the patch pair?

> ---
>  drivers/net/ethernet/intel/igb/igb_main.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
> index 6256855d0f62..7a3a41dc0276 100644
> --- a/drivers/net/ethernet/intel/igb/igb_main.c
> +++ b/drivers/net/ethernet/intel/igb/igb_main.c
> @@ -1195,7 +1195,7 @@ static int igb_alloc_q_vector(struct igb_adapter *adapter,
>  		return -ENOMEM;
>  
>  	ring_count = txr_count + rxr_count;
> -	size = struct_size(q_vector, ring, ring_count);
> +	size = kmalloc_size_roundup(struct_size(q_vector, ring, ring_count));
>  
>  	/* allocate q_vector and rings */
>  	q_vector = adapter->q_vector[v_idx];

Thanks! :)

-Kees

-- 
Kees Cook