linux-kernel - Re: [Bug #16626] Machine hangs with EIP at skb_copy_and_csum

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Date:	Wed, 8 Sep 2010 06:20:04 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Plamen Petrov <pvp-lsts@...uni-ruse.bg>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Maciej Rutecki <maciej.rutecki@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	netdev@...r.kernel.org
Subject: Re: [Bug #16626] Machine hangs with EIP at skb_copy_and_csum_dev

On Wed, Sep 08, 2010 at 07:57:31AM +0300, Plamen Petrov wrote:
> ???? 05.9.2010 ??. 10:49, Eric Dumazet ????????????:
>> Le samedi 04 septembre 2010 ?? 22:34 +0200, Jarek Poplawski a écrit :
>>
>>> Hi again,
>>>
>>> Just had a second look, and unless I miss something...
>>>
>>> Plamen, could you test this patch, too? (Without removing the previous
>>> one.)
>>>
>>> Thanks,
>>> Jarek P.
>>>
>>> ------------------->
>>>
>>> [PATCH] gro: Re-fix different skb headrooms
>>>
>>> The patch: "gro: fix different skb headrooms" in its part:
>>> "2) allocate a minimal skb for head of frag_list" is buggy. The copied
>>> skb has p->data set at the ip header at the moment, and skb_gro_offset
>>> is the length of ip + tcp headers. So, after the change the length of
>>> mac header is skipped. Later skb_set_mac_header() sets it into the
>>> NET_SKB_PAD area (if it's long enough) and ip header is misaligned at
>>> NET_SKB_PAD + NET_IP_ALIGN offset. There is no reason to assume the
>>> original skb was wrongly allocated, so let's copy it as it was.
>>>
>>> bugzilla : https://bugzilla.kernel.org/show_bug.cgi?id=16626
>>> fixes commit: 3d3be4333fdf6faa080947b331a6a19bce1a4f57
>>>
>>> Reported-by: Plamen Petrov<pvp-lsts@...uni-ruse.bg>
>>> Signed-off-by: Jarek Poplawski<jarkao2@...il.com>
>>> CC: Eric Dumazet<eric.dumazet@...il.com>
>>> ---
>>>
>>> diff --git a/net/core/skbuff.c b/net/core/skbuff.c
>>> index 26396ff..c83b421 100644
>>> --- a/net/core/skbuff.c
>>> +++ b/net/core/skbuff.c
>>> @@ -2706,7 +2706,7 @@ int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb)
>>>   	} else if (skb_gro_len(p) != pinfo->gso_size)
>>>   		return -E2BIG;
>>>
>>> -	headroom = NET_SKB_PAD + NET_IP_ALIGN;
>>> +	headroom = skb_headroom(p);
>>>   	nskb = alloc_skb(headroom + skb_gro_offset(p), GFP_ATOMIC);
>>>   	if (unlikely(!nskb))
>>>   		return -ENOMEM;
>>
>> You are right, thanks for reviewing this patch again :)
>>
>> By the way, NET_IP_ALIGN is now 0 on x86, so technically speaking, your
>> patch un-aligns IP header on x86, but thats OK, since other arches might
>> want it being aligned, while x86 doesnt care.
>>
>> Acked-by: Eric Dumazet<eric.dumazet@...il.com>
>>
>>
>>
>
> Well, now that I'm back at work, I'm glad to report
> that I tested both variants of the patch, and as Eric
> points out - it works both ways.
>
> So, which ever fits you guys better.

We need both of them. I hope David could add this too:

Tested-by: Plamen Petrov <pvp-lsts@...uni-ruse.bg>

Thanks a lot everybody!
Jarek P.
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