netdev - Re: [PATCH 1/1] net:socket: set msg_namelen to 0 if msg_name is passed as NULL in msghdr struct from userland.

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Message-Id: <20140909.173607.2092550389439938050.davem@davemloft.net>
Date:	Tue, 09 Sep 2014 17:36:07 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	ani@...sta.com
Cc:	fruggeri@...sta.com, netdev@...r.kernel.org, fenner@...sta.com,
	travisb@...sta.com, hannes@...essinduktion.org,
	matthew.leach@....com, eric.dumazet@...il.com
Subject: Re: [PATCH 1/1] net:socket: set msg_namelen to 0 if msg_name is
 passed as NULL in msghdr struct from userland.

From: Ani Sinha <ani@...sta.com>
Date: Mon,  8 Sep 2014 14:49:59 -0700

> Linux manpage for recvmsg and sendmsg calls does not explicitly mention setting msg_namelen to 0 when
> msg_name passed set as NULL. When developers don't set msg_namelen member in msghdr, it might contain garbage
> value which will fail the validation check and sendmsg and recvmsg calls from kernel will return EINVAL. This will
> break old binaries and any code for which there is no access to source code.
> To fix this, we set msg_namelen to 0 when msg_name is passed as NULL from userland.
> 
> Signed-off-by: Ani Sinha <ani@...sta.com>

Applied, thanks.
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