netdev - Re: [PATCH v2] sched: report if filter is too large to dump

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Message-Id: <20180220.215809.1929486406284619867.davem@davemloft.net>
Date:   Tue, 20 Feb 2018 21:58:09 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     code@...pl.cz
Cc:     netdev@...r.kernel.org, jiri@...nulli.us, xiyou.wangcong@...il.com,
        jbenc@...hat.com
Subject: Re: [PATCH v2] sched: report if filter is too large to dump

From: Roman Kapl <code@...pl.cz>
Date: Mon, 19 Feb 2018 21:32:51 +0100

> So far, if the filter was too large to fit in the allocated skb, the
> kernel did not return any error and stopped dumping. Modify the dumper
> so that it returns -EMSGSIZE when a filter fails to dump and it is the
> first filter in the skb. If we are not first, we will get a next chance
> with more room.
> 
> I understand this is pretty near to being an API change, but the
> original design (silent truncation) can be considered a bug.
> 
> Note: The error case can happen pretty easily if you create a filter
> with 32 actions and have 4kb pages. Also recent versions of iproute try
> to be clever with their buffer allocation size, which in turn leads to
> 
> Signed-off-by: Roman Kapl <code@...pl.cz>

Applied and queued up for -stable, thanks Roman.