netdev - Re: [PATCH 1/2] sctp: sctp_sendmsg: Don't initialize default

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Message-Id: <20110512.170603.549349521517995900.davem@davemloft.net>
Date:	Thu, 12 May 2011 17:06:03 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	joe@...ches.com
Cc:	vladislav.yasevich@...com, sri@...ibm.com,
	linux-sctp@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] sctp: sctp_sendmsg: Don't initialize default_sinfo

From: Joe Perches <joe@...ches.com>
Date: Thu, 12 May 2011 12:19:09 -0700

> This variable only needs initialization when cmsgs.info
> is NULL.
> 
> Don't use memset, just initialize every struct member.
> 
> Signed-off-by: Joe Perches <joe@...ches.com>

I don't think you do this, this structure has padding holes on pretty
much every architecture.

It starts with 3 u16's, then there is a u32, so there is a 2-byte
piece of padding after the 3rd u16.

Can you prove that these uninitialized portions never make it to
userspace?  If you can, that proof belongs in the commit message.

I think it's too risky.
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