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

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Message-ID: <AE90C24D6B3A694183C094C60CF0A2F6026B746B@saturn3.aculab.com>
Date:	Fri, 6 Dec 2013 15:46:31 -0000
From:	"David Laight" <David.Laight@...LAB.COM>
To:	"Neil Horman" <nhorman@...driver.com>, <linux-sctp@...r.kernel.org>
Cc:	"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

> 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



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