linux-kernel - Re: [PATCH,TRIVIAL] AF_UNIX, accept() and addrlen

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Message-Id: <20080323.215641.192753003.davem@davemloft.net>
Date:	Sun, 23 Mar 2008 21:56:41 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	samuel.thibault@...-lyon.org
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: [PATCH,TRIVIAL] AF_UNIX, accept() and addrlen

From: Samuel Thibault <samuel.thibault@...-lyon.org>
Date: Sat, 8 Mar 2008 02:23:21 +0000

> Accept and getpeername are supposed to return the amount of bytes
> written in the returned address.  However, on unnamed sockets, only
> sizeof(short) is returned, while a 0 is put in the sun_path member.
> This patch adds 1 for that additional byte.
> 
> Signed-off-by: Samuel Thibault <samuel.thibault@...-lyon.org>

This change isn't correct.  It's the fact that the
length returned is sizeof(short) that tells the caller
that the unix socket is unnamed.

We zero out the sun_path[0] member just to be polite
and tidy.

You would break applications if you changed this, so
marking this patch as "trivial" is extremely premature.
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