From: David Miller <davem@davemloft.net>
To: amit.salecha@qlogic.com
Cc: eric.dumazet@gmail.com, netdev@vger.kernel.org,
ameen.rahman@qlogic.com, anirban.chakraborty@qlogic.com
Subject: Re: [PATCH] qlcnic: dont assume NET_IP_ALIGN is 2
Date: Tue, 21 Sep 2010 12:33:38 -0700 (PDT) [thread overview]
Message-ID: <20100921.123338.71122967.davem@davemloft.net> (raw)
In-Reply-To: <99737F4847ED0A48AECC9F4A1974A4B80F86F80278@MNEXMB2.qlogic.org>
From: Amit Salecha <amit.salecha@qlogic.com>
Date: Tue, 21 Sep 2010 03:41:42 -0500
>> So in order to improve "throughput", you were allowing for memory
>> exhaust and freeze of the _machine_ ?
>>
> This won't lead to such problem. truesize is used for accounting only.
Yes, it will.
Do you understand that we enforce both socket-level and system-wide
networking buffer usage in the stack? And this limiting is based
upon skb->truesize and therefore only works if skb->truesize is
accurate?
It's meant to keep people from attacking a server and consuming large
percentages of system memory with networking buffer memory such that
other tasks cannot complete successfully.
And by mis-reporting the truesize you are subverting that entirely.
This qlcnic truesize bug is a huge security hole, can't you see this
now?
next prev parent reply other threads:[~2010-09-21 19:33 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-17 5:14 [PATCHv2 NEXT 0/5]qlcnic: vlan rx accleration support Amit Kumar Salecha
2010-09-17 5:14 ` [PATCHv2 NEXT 1/5] qlcnic: support vlan rx accleration Amit Kumar Salecha
2010-09-17 5:29 ` Eric Dumazet
2010-09-17 9:57 ` [PATCH] qlcnic: dont assume NET_IP_ALIGN is 2 Eric Dumazet
2010-09-17 10:53 ` Amit Salecha
2010-09-18 5:58 ` David Miller
2010-09-20 11:16 ` Amit Salecha
2010-09-20 12:18 ` Eric Dumazet
2010-09-20 12:28 ` [PATCH net-next-2.6] qlnic: dont set skb->truesize Eric Dumazet
2010-09-20 17:09 ` David Miller
2010-09-20 15:58 ` [PATCH] qlcnic: dont assume NET_IP_ALIGN is 2 David Miller
2010-09-21 8:19 ` Amit Salecha
2010-09-21 8:34 ` Eric Dumazet
2010-09-21 8:41 ` Amit Salecha
2010-09-21 9:23 ` Eric Dumazet
2010-09-21 19:33 ` David Miller [this message]
2010-09-21 19:55 ` [PATCH] netxen: dont set skb->truesize Eric Dumazet
2010-09-21 20:04 ` David Miller
2010-09-17 5:14 ` [PATCHv2 NEXT 2/5] qlcnic: vlan gro support Amit Kumar Salecha
2010-09-17 18:24 ` David Miller
2010-09-17 18:25 ` David Miller
2010-09-17 5:14 ` [PATCHv2 NEXT 3/5] qlcnic: vlan lro support Amit Kumar Salecha
2010-09-17 5:14 ` [PATCHv2 NEXT 4/5] qlcnic: remove fw version check Amit Kumar Salecha
2010-09-17 5:14 ` [PATCHv2 NEXT 5/5] qlcnic: update version 5.0.10 Amit Kumar Salecha
2010-09-17 18:31 ` [PATCHv2 NEXT 0/5]qlcnic: vlan rx accleration support David Miller
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