linux-hardening - Re: [Intel-wired-lan] [PATCH] net/i40e: Replace 0-length array with flexible array

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Date:   Fri, 6 Jan 2023 10:27:44 -0600
From:   "Gustavo A. R. Silva" <gustavoars@...nel.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Jesse Brandeburg <jesse.brandeburg@...el.com>,
        intel-wired-lan@...ts.osuosl.org, linux-kernel@...r.kernel.org,
        Eric Dumazet <edumazet@...gle.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        linux-hardening@...r.kernel.org, netdev@...r.kernel.org,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [Intel-wired-lan] [PATCH] net/i40e: Replace 0-length array with
 flexible array

On Thu, Jan 05, 2023 at 03:46:01PM -0800, Kees Cook wrote:
> Zero-length arrays are deprecated[1]. Replace struct i40e_lump_tracking's
> "list" 0-length array with a flexible array. Detected with GCC 13,
> using -fstrict-flex-arrays=3:
> 
> In function 'i40e_put_lump',
>     inlined from 'i40e_clear_interrupt_scheme' at drivers/net/ethernet/intel/i40e/i40e_main.c:5145:2:
> drivers/net/ethernet/intel/i40e/i40e_main.c:278:27: warning: array subscript <unknown> is outside array bounds of 'u16[0]' {aka 'short unsigned int[]'} [-Warray-bounds=]
>   278 |                 pile->list[i] = 0;
>       |                 ~~~~~~~~~~^~~
> drivers/net/ethernet/intel/i40e/i40e.h: In function 'i40e_clear_interrupt_scheme':
> drivers/net/ethernet/intel/i40e/i40e.h:179:13: note: while referencing 'list'
>   179 |         u16 list[0];
>       |             ^~~~
> 
> [1] https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays
> 
> Cc: Jesse Brandeburg <jesse.brandeburg@...el.com>
> Cc: Tony Nguyen <anthony.l.nguyen@...el.com>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: Eric Dumazet <edumazet@...gle.com>
> Cc: Jakub Kicinski <kuba@...nel.org>
> Cc: Paolo Abeni <pabeni@...hat.com>
> Cc: "Gustavo A. R. Silva" <gustavoars@...nel.org>
> Cc: intel-wired-lan@...ts.osuosl.org
> Cc: netdev@...r.kernel.org
> Signed-off-by: Kees Cook <keescook@...omium.org>

Reviewed-by: Gustavo A. R. Silva <gustavoars@...nel.org>

Thanks!
--
Gustavo

> ---
>  drivers/net/ethernet/intel/i40e/i40e.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/intel/i40e/i40e.h b/drivers/net/ethernet/intel/i40e/i40e.h
> index 60e351665c70..3a1c28ca5bb4 100644
> --- a/drivers/net/ethernet/intel/i40e/i40e.h
> +++ b/drivers/net/ethernet/intel/i40e/i40e.h
> @@ -176,7 +176,7 @@ enum i40e_interrupt_policy {
>  
>  struct i40e_lump_tracking {
>  	u16 num_entries;
> -	u16 list[0];
> +	u16 list[];
>  #define I40E_PILE_VALID_BIT  0x8000
>  #define I40E_IWARP_IRQ_PILE_ID  (I40E_PILE_VALID_BIT - 2)
>  };
> -- 
> 2.34.1
> 
> _______________________________________________
> Intel-wired-lan mailing list
> Intel-wired-lan@...osl.org
> https://lists.osuosl.org/mailman/listinfo/intel-wired-lan

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