netdev - Re: [patch net-next 2/2] net/sched: fix filter flushing

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]

Message-ID: <20170523051713.GB1829@nanopsycho>
Date:   Tue, 23 May 2017 07:17:13 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Simon Horman <simon.horman@...ronome.com>, mlxsw@...lanox.com,
        Colin King <colin.king@...onical.com>
Subject: Re: [patch net-next 2/2] net/sched: fix filter flushing

Mon, May 22, 2017 at 11:04:58PM CEST, xiyou.wangcong@...il.com wrote:
>On Mon, May 22, 2017 at 1:54 PM, Cong Wang <xiyou.wangcong@...il.com> wrote:
>> On Sun, May 21, 2017 at 12:19 PM, Jiri Pirko <jiri@...nulli.us> wrote:
>>>>You can't claim you really delete it as long as actions can still
>>>>see it and dump it.
>>>
>>> No, user just wants to delete all the filters. That is done. User does
>>> not care if the actual chain structure is there or not.
>>>
>>
>> Hmm, so users see a chain with no filters... Fair enough.
>
>But since you remove the chain from the chain_list, it means
>users could not add new filters to this chain after flushing? And

No, in flush, I don't remove it from the list. That is not in the
patch. Why would you think so?


>users could create a new chain with the same index??
>
>If so, you should instead keep it in the chain_list, although empty.