netdev - Re: EACCES sending UDP to broadcast address?

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] [day] [month] [year] [list]

Message-Id: <20150409.222843.586154432199987277.davem@davemloft.net>
Date:	Thu, 09 Apr 2015 22:28:43 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	greearb@...delatech.com
Cc:	netdev@...r.kernel.org
Subject: Re: EACCES sending UDP to broadcast address?

From: Ben Greear <greearb@...delatech.com>
Date: Thu, 09 Apr 2015 18:04:44 -0700

> I'm running as root user, 4.0-rc6 + hack kernel.
> 
> User-space app is (or should be) trying to send a UDP frame
> to 255.255.255.255 destination.
> 
> I am getting EACCESS from sendmmsg.
> 
> Is this expected?  Is there something even more special than root these
> days?

You can't send to broadcast addresses without setting the
SOCK_BROADCAST socket option.

I didn't know the answer to this, it took me 10 seconds of grepping
around under net/ipv4 to figure it out.  You could have done this
too.
--
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