linux-kernel - Re: [PATCH net-next] ixgbe: Use memzero

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Date:   Wed, 18 Sep 2019 10:43:59 +0800
From:   zhong jiang <zhongjiang@...wei.com>
To:     zhong jiang <zhongjiang@...wei.com>
CC:     <jakub.kicinski@...ronome.com>, <davem@...emloft.net>,
        <anna.schumaker@...app.com>, <trond.myklebust@...merspace.com>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next] ixgbe: Use memzero_explicit directly in crypto
 cases

On 2019/9/18 10:36, zhong jiang wrote:
> In general, Use kzfree() to replace memset() + kfree() is feasible and
> resonable.  But It's btter to use memzero_explicit() to replace memset()
> in crypto cases.
s/btter/better/,  will repost.   sorry for that.

Thanks,
zhong jiang
> Signed-off-by: zhong jiang <zhongjiang@...wei.com>
> ---
>  drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c
> index 113f608..7e4f32f 100644
> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c
> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c
> @@ -960,9 +960,11 @@ int ixgbe_ipsec_vf_add_sa(struct ixgbe_adapter *adapter, u32 *msgbuf, u32 vf)
>  	return 0;
>  
>  err_aead:
> -	kzfree(xs->aead);
> +	memzero_explicit(xs->aead, sizeof(*xs->aead));
> +	kfree(xs->aead);
>  err_xs:
> -	kzfree(xs);
> +	memzero_explicit(xs, sizeof(*xs));
> +	kfree(xs);
>  err_out:
>  	msgbuf[1] = err;
>  	return err;
> @@ -1047,7 +1049,8 @@ int ixgbe_ipsec_vf_del_sa(struct ixgbe_adapter *adapter, u32 *msgbuf, u32 vf)
>  	ixgbe_ipsec_del_sa(xs);
>  
>  	/* remove the xs that was made-up in the add request */
> -	kzfree(xs);
> +	memzero_explicit(xs, sizeof(*xs));
> +	kfree(xs);
>  
>  	return 0;
>  }