From: Konstantin Osipov <kostja.osipov@gmail.com> To: Vladislav Shpilevoy <v.shpilevoy@tarantool.org> Cc: kirichenkoga@gmail.com, tarantool-patches@dev.tarantool.org Subject: Re: [Tarantool-patches] [PATCH v4 3/4] replication: implement an instance id filter for relay Date: Thu, 27 Feb 2020 09:48:03 +0300 [thread overview] Message-ID: <20200227064803.GD29715@atlas> (raw) In-Reply-To: <172faa01-c31c-76e6-bb45-066f44ffc73d@tarantool.org> * Vladislav Shpilevoy <v.shpilevoy@tarantool.org> [20/02/27 09:42]: > > + unsigned int id_filter) > > 3. Nit - it would be better to have it as uint32_t explicitly. > Becuase max id count is 32. Unsigned int does not have size > guarantees, formally speaking. It is at least 16 bits, no more > info. We use unsigned int in struct vclock, I think vclock.h also needs a follow up then. > > + if (filter_size) { > > 5. I wouldn't make it optional in encoding, since this is sent > really rare, but could simplify the code a bit. However, up to > you. > > Also, won't it break replication from an old version? You > will send subscribe with this new key, and the old instance > should ignore it. Does it? I don't remember. > > If the old instance would ignore it, it means that the bug > still can explode when replicating from an old version, right? > I don't know how to fix that, but if it is true, we need to > document that, at least. This is true, however, it only happens at reconfiguration, you're not supposed to actively use a heterogeneous cluster, only upgrade it (bootstrap). > > > + *id_filter |= 1 << mp_decode_uint(&d); > > 7. If someone would send a big ID (a program, pretending to be a Tarantool > instance), it would cause unsigned bit shift overflow, which is undefined > behaviour. Lets check that it is not bigger than 31. > > However this won't really help much. This code will crash even if I will > just send a truncated packet. From what I see. > > Up to you whether you want to fix the bit shift. Good catch, this would be a CVE then and a huge publicity issue. There should be no crashes when parsing malformed requests. > -- Konstantin Osipov, Moscow, Russia
next prev parent reply other threads:[~2020-02-27 6:48 UTC|newest] Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-02-26 10:00 [Tarantool-patches] [PATCH v4 0/4] replication: fix applying of rows originating from local instance sergepetrenko 2020-02-26 10:00 ` [Tarantool-patches] [PATCH v4 1/4] box: expose box_is_orphan method sergepetrenko 2020-02-26 10:00 ` [Tarantool-patches] [PATCH v4 2/4] wal: warn when trying to write a record with a broken lsn sergepetrenko 2020-02-26 10:00 ` [Tarantool-patches] [PATCH v4 3/4] replication: implement an instance id filter for relay sergepetrenko 2020-02-26 10:18 ` Konstantin Osipov 2020-02-26 11:16 ` Serge Petrenko 2020-02-26 23:54 ` Vladislav Shpilevoy 2020-02-27 6:48 ` Konstantin Osipov [this message] 2020-02-27 13:15 ` Serge Petrenko 2020-02-27 23:33 ` Vladislav Shpilevoy 2020-02-26 10:00 ` [Tarantool-patches] [PATCH v4 4/4] replication: do not relay rows coming from a remote instance back to it sergepetrenko 2020-02-26 10:23 ` Konstantin Osipov 2020-02-26 11:21 ` Serge Petrenko 2020-02-26 11:58 ` Konstantin Osipov 2020-02-26 15:58 ` Serge Petrenko 2020-02-26 16:40 ` Konstantin Osipov 2020-02-26 23:54 ` Vladislav Shpilevoy 2020-02-27 6:52 ` Konstantin Osipov 2020-02-27 14:13 ` Serge Petrenko 2020-02-27 21:17 ` Serge Petrenko 2020-02-27 23:22 ` Vladislav Shpilevoy 2020-02-28 8:03 ` Serge Petrenko 2020-02-26 23:54 ` [Tarantool-patches] [PATCH v4 0/4] replication: fix applying of rows originating from local instance Vladislav Shpilevoy 2020-02-27 21:24 ` Serge Petrenko 2020-02-27 23:24 ` Vladislav Shpilevoy
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