netdev - Re: [PATCH] sctp: properly latch and use autoclose value from sock to association

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:	Fri, 6 Dec 2013 11:04:35 -0500
From:	Neil Horman <nhorman@...driver.com>
To:	David Laight <David.Laight@...LAB.COM>
Cc:	linux-sctp@...r.kernel.org, Wang Weidong <wangweidong1@...wei.com>,
	David Miller <davem@...emloft.net>,
	Vlad Yasevich <vyasevich@...il.com>, netdev@...r.kernel.org
Subject: Re: [PATCH] sctp: properly latch and use autoclose value from sock
 to association

On Fri, Dec 06, 2013 at 03:46:31PM -0000, David Laight wrote:
> > From: Neil Horman
> > Currently, sctp associations latch a sockets autoclose value to an association
> > at association init time, subject to capping constraints from the max_autoclose
> > sysctl value.  This leads to an odd situation where an application may set a
> > socket level autoclose timeout, but sliently sctp will limit the autoclose
> > timeout to something less than that.
> > 
> > Fix this by modifying the autoclose setsockopt function to check the limit, cap
> > it and warn the user via syslog that the timeout is capped.  This will allow
> > getsockopt to return valid autoclose timeout values that reflect what subsequent
> > associations actually use.
> ...
> > +	if (sp->autoclose > net->sctp.max_autoclose) {
> > +		pr_warn("Capping autoclose value %d to defined maximum of %lu\n",
> > +			sp->autoclose, net->sctp.max_autoclose);
> > +		sp->autoclose = net->sctp.max_autoclose;
> > +	}
> 
> Is it really reasonable to allow a user to spam syslog this way?
> 
> 	David
> 
Hmm, good point, maybe a pr_ratelimit gate?

Neil

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