netdev - Re: [PATCH net-next v3 7/7] tls: rx: do not use the standard strparser

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Message-ID: <5696e2f2-1a0d-7da9-700b-d665045c79d9@gmail.com>
Date:   Sun, 7 Aug 2022 09:01:06 +0300
From:   Tariq Toukan <ttoukan.linux@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, edumazet@...gle.com, pabeni@...hat.com,
        borisp@...dia.com, john.fastabend@...il.com, maximmi@...dia.com,
        tariqt@...dia.com, vfedorenko@...ek.ru,
        Ran Rozenstein <ranro@...dia.com>,
        "gal@...dia.com" <gal@...dia.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH net-next v3 7/7] tls: rx: do not use the standard
 strparser



On 8/4/2022 6:59 PM, Jakub Kicinski wrote:
> On Thu, 4 Aug 2022 11:05:18 +0300 Tariq Toukan wrote:
>>>    	trace_tls_device_decrypted(sk, tcp_sk(sk)->copied_seq - rxm->full_len,
>>
>> Now we see a different trace:
>>
>> ------------[ cut here ]------------
>> WARNING: CPU: 4 PID: 45887 at net/tls/tls_strp.c:53
> 
> OK, if you find another I promise I'll try to hassle a machine with
> offload from somewhere... here's the fix for the new one:
> 
> --->8----------------
> tls: rx: device: don't try to copy too much on detach
> 
> Another device offload bug, we use the length of the output
> skb as an indication of how much data to copy. But that skb
> is sized to offset + record length, and we start from offset.
> So we end up double-counting the offset which leads to
> skb_copy_bits() returning -EFAULT.
> 
> Reported-by: Tariq Toukan <tariqt@...dia.com>
> Fixes: 84c61fe1a75b ("tls: rx: do not use the standard strparser")
> Signed-off-by: Jakub Kicinski <kuba@...nel.org>
> ---
>   net/tls/tls_strp.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/tls/tls_strp.c b/net/tls/tls_strp.c
> index f0b7c9122fba..9b79e334dbd9 100644
> --- a/net/tls/tls_strp.c
> +++ b/net/tls/tls_strp.c
> @@ -41,7 +41,7 @@ static struct sk_buff *tls_strp_msg_make_copy(struct tls_strparser *strp)
>   	struct sk_buff *skb;
>   	int i, err, offset;
>   
> -	skb = alloc_skb_with_frags(0, strp->anchor->len, TLS_PAGE_ORDER,
> +	skb = alloc_skb_with_frags(0, strp->stm.full_len, TLS_PAGE_ORDER,
>   				   &err, strp->sk->sk_allocation);
>   	if (!skb)
>   		return NULL;

Hi Jakub,
Thanks for the patch.
We're testing it and I'll update.