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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

  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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