netdev - Re: [PATCH] net: sysctl_net_core: check SNDBUF and RCVBUF for min length

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Message-Id: <20150311.212545.1595223451693204245.davem@davemloft.net>
Date:	Wed, 11 Mar 2015 21:25:45 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	alexey.kodanev@...cle.com
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	vasily.isaenko@...cle.com
Subject: Re: [PATCH] net: sysctl_net_core: check SNDBUF and RCVBUF for min
 length

From: Alexey Kodanev <alexey.kodanev@...cle.com>
Date: Wed, 11 Mar 2015 14:29:17 +0300

> sysctl has sysctl.net.core.rmem_*/wmem_* parameters which can be
> set to incorrect values. Given that 'struct sk_buff' allocates from
> rcvbuf, incorrectly set buffer length could result to memory
> allocation failures. For example, set them as follows:
> 
>     # sysctl net.core.rmem_default=64
>       net.core.wmem_default = 64
>     # sysctl net.core.wmem_default=64
>       net.core.wmem_default = 64
>     # ping localhost -s 1024 -i 0 > /dev/null
> 
> This could result to the following failure:
 ...
> Signed-off-by: Alexey Kodanev <alexey.kodanev@...cle.com>

Applied, but someone needs to followup with fixes to AF_UNIX etc.
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