From: David Miller <davem@davemloft.net>
To: eric.dumazet@gmail.com
Cc: aduyck@mirantis.com, netdev@vger.kernel.org,
alexander.duyck@gmail.com, sowmini.varadhan@oracle.com,
tom@herbertland.com
Subject: Re: [net PATCH] flow_dissector: Fix unaligned access in __skb_flow_dissector when used by eth_get_headlen
Date: Fri, 29 Jan 2016 19:35:20 -0800 (PST) [thread overview]
Message-ID: <20160129.193520.477355610549821770.davem@davemloft.net> (raw)
In-Reply-To: <1454124234.7627.119.camel@edumazet-glaptop2.roam.corp.google.com>
From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Fri, 29 Jan 2016 19:23:54 -0800
> On Fri, 2016-01-29 at 18:49 -0800, Alexander Duyck wrote:
>> This patch fixes an issue with unaligned accesses when using
>> eth_get_headlen on a page that was DMA aligned instead of being IP aligned.
>> The fact is when trying to check the length we don't need to be looking at
>> the flow label so we can reorder the checks to first check if we are
>> supposed to gather the flow label and then make the call to actually get
>> it.
>>
>> Reported-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
>> Signed-off-by: Alexander Duyck <aduyck@mirantis.com>
>> ---
>
>
> You did not quite follow the discussion Alexander, we did not exactly
> took a decision about this bug.
>
> As we mentioned, there are other parts that need care.
>
> key_keyid->keyid = *keyid;
>
> Please address them, instead of having to 'wait' for the next crash.
Indeed, this is a more fundamental issue.
This change in and of itself isn't bad, and is probably a suitable
micro-optimization for net-next, but it doesn't fix the bug in
question.
next prev parent reply other threads:[~2016-01-30 3:35 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-29 18:06 [RFC] Kernel unaligned access at __skb_flow_dissect Sowmini Varadhan
2016-01-29 18:33 ` Eric Dumazet
2016-01-29 18:40 ` Eric Dumazet
2016-01-29 19:08 ` David Miller
2016-01-29 19:39 ` Eric Dumazet
2016-01-29 18:54 ` Eric Dumazet
2016-01-29 19:22 ` Sowmini Varadhan
2016-01-29 21:00 ` Tom Herbert
2016-01-29 21:09 ` Sowmini Varadhan
2016-01-29 21:33 ` Tom Herbert
2016-01-29 23:00 ` Tom Herbert
2016-01-29 23:04 ` Sowmini Varadhan
2016-01-29 23:31 ` Tom Herbert
2016-01-29 23:58 ` Sowmini Varadhan
2016-01-30 0:47 ` Tom Herbert
2016-01-30 1:18 ` David Miller
2016-01-30 2:15 ` Eric Dumazet
2016-01-31 22:13 ` Tom Herbert
2016-02-01 0:04 ` Eric Dumazet
2016-01-29 19:06 ` David Miller
2016-01-29 19:37 ` Eric Dumazet
2016-01-29 19:41 ` David Miller
2016-01-29 19:44 ` Sowmini Varadhan
2016-01-29 20:01 ` Eric Dumazet
2016-01-29 20:06 ` Eric Dumazet
2016-01-29 21:16 ` Alexander Duyck
2016-01-29 21:33 ` Eric Dumazet
2016-01-29 22:08 ` Alexander Duyck
2016-01-29 22:28 ` Eric Dumazet
2016-01-29 23:00 ` Alexander Duyck
2016-02-01 16:55 ` David Laight
2016-02-01 17:25 ` Eric Dumazet
2016-01-29 19:04 ` David Miller
2016-01-30 2:49 ` [net PATCH] flow_dissector: Fix unaligned access in __skb_flow_dissector when used by eth_get_headlen Alexander Duyck
2016-01-30 3:23 ` Eric Dumazet
2016-01-30 3:35 ` David Miller [this message]
2016-01-30 4:46 ` Alexander Duyck
2016-01-30 16:17 ` Sowmini Varadhan
2016-01-30 17:43 ` Tom Herbert
2016-01-30 19:12 ` Sowmini Varadhan
2016-01-30 18:36 ` Alexander Duyck
2016-01-30 19:26 ` Eric Dumazet
2016-01-31 1:13 ` Alexander Duyck
2016-01-31 3:45 ` David Miller
2016-01-31 9:12 ` Alexander Duyck
2016-01-31 19:17 ` David Miller
2016-01-31 21:23 ` Sowmini Varadhan
2016-02-01 16:50 ` David Laight
2016-02-01 18:18 ` Alexander Duyck
2016-02-02 9:47 ` David Laight
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