netdev - Re: [PATCH net-next] af_unix: MSG_TRUNC support for dgram sockets

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 22 Feb 2012 14:50:28 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	piergiorgio.beruto@...il.com, netdev@...r.kernel.org,
	mtk.manpages@...il.com
Subject: Re: [PATCH net-next] af_unix: MSG_TRUNC support for dgram sockets

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Wed, 22 Feb 2012 10:24:55 +0100

> Piergiorgio Beruto expressed the need to fetch size of first datagram in
> queue for AF_UNIX sockets and suggested a patch against SIOCINQ ioctl.
> 
> I suggested instead to implement MSG_TRUNC support as a recv() input
> flag, as already done for RAW, UDP & NETLINK sockets.
> 
> len = recv(fd, &byte, 1, MSG_PEEK | MSG_TRUNC);
> 
> MSG_TRUNC asks recv() to return the real length of the packet, even when
> is was longer than the passed buffer.
> 
> There is risk that a userland application used MSG_TRUNC by accident
> (since it had no effect on af_unix sockets) and this might break after
> this patch.
> 
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
> Tested-by: Piergiorgio Beruto <piergiorgio.beruto@...il.com>
> CC: Michael Kerrisk <mtk.manpages@...il.com>

Applied.
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html