netdev - Re: [PATCH net] net: sctp: check proc_dointvec result in proc_sctp_do

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Message-Id: <20140619.213137.2272589325097681936.davem@davemloft.net>
Date:	Thu, 19 Jun 2014 21:31:37 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	dborkman@...hat.com
Cc:	netdev@...r.kernel.org, linux-sctp@...r.kernel.org
Subject: Re: [PATCH net] net: sctp: check proc_dointvec result in
 proc_sctp_do_auth

From: Daniel Borkmann <dborkman@...hat.com>
Date: Wed, 18 Jun 2014 23:46:31 +0200

> When writing to the sysctl field net.sctp.auth_enable, it can well
> be that the user buffer we handed over to proc_dointvec() via
> proc_sctp_do_auth() handler contains something other than integers.
> 
> In that case, we would set an uninitialized 4-byte value from the
> stack to net->sctp.auth_enable that can be leaked back when reading
> the sysctl variable, and it can unintentionally turn auth_enable
> on/off based on the stack content since auth_enable is interpreted
> as a boolean.
> 
> Fix it up by making sure proc_dointvec() returned sucessfully.
> 
> Fixes: b14878ccb7fa ("net: sctp: cache auth_enable per endpoint")
> Reported-by: Florian Westphal <fwestpha@...hat.com>
> Signed-off-by: Daniel Borkmann <dborkman@...hat.com>

Applied, thanks Daniel.
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