netdev - Re: [PATCH net 2/2] net: cls_bpf: fix auto generation of per list handles

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Date:	Thu, 22 Jan 2015 10:52:20 -0800
From:	Alexei Starovoitov <alexei.starovoitov@...il.com>
To:	Daniel Borkmann <dborkman@...hat.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Jiří Pírko <jiri@...nulli.us>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net 2/2] net: cls_bpf: fix auto generation of per list handles

On Thu, Jan 22, 2015 at 1:41 AM, Daniel Borkmann <dborkman@...hat.com> wrote:
> When creating a bpf classifier in tc with priority collisions and
> invoking automatic unique handle assignment, cls_bpf_grab_new_handle()
> will return a wrong handle id which in fact is non-unique. Usually
> altering of specific filters is being addressed over major id, but
> in case of collisions we result in a filter chain, where handle ids
> address individual cls_bpf_progs inside the classifier.
>
> Issue is, in cls_bpf_grab_new_handle() we probe for head->hgen handle
> in cls_bpf_get() and in case we found a free handle, we're supposed
> to use exactly head->hgen. In case of insufficient numbers of handles,
> we bail out later as handle id 0 is not allowed.
>
> Fixes: 7d1d65cb84e1 ("net: sched: cls_bpf: add BPF-based classifier")
> Signed-off-by: Daniel Borkmann <dborkman@...hat.com>
> Acked-by: Jiri Pirko <jiri@...nulli.us>

Acked-by: Alexei Starovoitov <ast@...mgrid.com>

interesting bug. first time I'm looking at this bit and wondering
why everyone copy pasting such hgenerator instead of using idr...
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