netdev - Re: [NET]: Please revert disallowing zero listen queues

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: <45F1B21B.7010402@hp.com>
Date:	Fri, 09 Mar 2007 14:14:35 -0500
From:	Vlad Yasevich <vladislav.yasevich@...com>
To:	David Miller <davem@...emloft.net>
Cc:	rick.jones2@...com, gerrit@....abdn.ac.uk, netdev@...r.kernel.org,
	weid@...css.fujitsu.com
Subject: Re: [NET]: Please revert disallowing zero listen queues

David Miller wrote:
> From: Rick Jones <rick.jones2@...com>
> Date: Tue, 06 Mar 2007 10:54:00 -0800
> 
>>> So we're not "disallowing" a backlog argument of zero to
>>> listen().  We'll accept that just fine, the only thing that
>>> happens is that you'll get what you ask for, that being
>>> no connections :-)
>> I'm not sure where HP-UX inherited the 0 = 1 bit - perhaps from BSD, nor 
>> am I sure there is official chapter and verse, but:
>>
>> <excerpt>
>> backlog is limited to the range of 0 to SOMAXCONN, which is 	defined in 
>> <sys/socket.h>.  SOMAXCONN is currently set to 4096.  If any other 
>> value is specified, the system automatically assigns the closest value 
>>      within the range.  A backlog of 0 specifies only 1 pending 
>> connection      is allowed at any given time.
>> </excerpt>
>>
>> I don't have a Solaris, BSD or AIX manpage for listen handy to check 
>> them but would not be surprised to see they are similar.
> 
> Ok, that seals the deal for me, I'll revert the change :)

Ahh, crap.  Even Posix wiesel-words around this issue:

> A backlog argument of 0 may allow the socket to accept connections, in which case
> the length of the listen queue may be set to an implementation-defined minimum value.

(from http://www.opengroup.org/onlinepubs/009695399/functions/listen.html)

No, to go and fix the SCTP spec....

-vlad
-
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