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Re: [Qemu-devel] [PATCH 1/8] qdict: fix unbounded stack for qdict_array_
From: |
Daniel P. Berrange |
Subject: |
Re: [Qemu-devel] [PATCH 1/8] qdict: fix unbounded stack for qdict_array_entries |
Date: |
Tue, 8 Mar 2016 16:50:35 +0000 |
User-agent: |
Mutt/1.5.24 (2015-08-30) |
On Tue, Mar 08, 2016 at 05:30:31PM +0100, Kevin Wolf wrote:
> Am 08.03.2016 um 17:21 hat Eric Blake geschrieben:
> > On 03/08/2016 03:19 AM, Kevin Wolf wrote:
> > > Am 08.03.2016 um 09:22 hat Markus Armbruster geschrieben:
> > >> Cc: Kevin, because he added the array in question.
> > >>
> > >> Peter Xu <address@hidden> writes:
> > >>
> >
> > >> Unrelated to your patch: I think we've pushed QDict use father than
> > >> sensible. Encoding multiple keys in a string so you can use a flat
> > >> associative array as your catch-all data structure is appropriate in
> > >> AWK, but in C? Not so much...
> > >
> > > We'll always to that, because it's the command line syntax. What you may
> > > criticise is that we convert QAPI objects to the command line
> > > representation instead of the other way around, but changing that (which
> > > I think would be far from trivial, for relatively little use) wouldn't
> > > get rid of this kind of key parsing, but just move it a bit closer to
> > > the command line handling.
> >
> > I actually WANT us to try that conversion (a great GSoC project, if
> > someone wants it) for 2.7. We already did it for SocketAddress, and it
> > makes the code easier to maintain when you can just access foo->data
> > instead of doing qdict_lookup(foo, "data") all over the place.
>
> I think you're underestimating the difference in difficulty between
> using SocketAddress everywhere and using BlockdevOptions everywhere,
> which is the reason why I never even put it on my todo list.
>
> Of course, I would be fine with your trying anyway, but it would
> probably be fairer if we not let a poor student fail with this.
I think a more sensible/practical first step would be to change the block
layer to using the nested QDicts as its primary representation, instead
of the flat QDicts. In APIs which get a flat qdict (CLI QemuOpts & HMP),
it should really immediately crumple it into a nested QDict before usage.
Regards,
Daniel
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- [Qemu-devel] [PATCH 0/8] Fix several unbounded stack usage, Peter Xu, 2016/03/08
- [Qemu-devel] [PATCH 1/8] qdict: fix unbounded stack for qdict_array_entries, Peter Xu, 2016/03/08
- Re: [Qemu-devel] [PATCH 1/8] qdict: fix unbounded stack for qdict_array_entries, Peter Xu, 2016/03/08
- Re: [Qemu-devel] [PATCH 1/8] qdict: fix unbounded stack for qdict_array_entries, Eric Blake, 2016/03/08
- Re: [Qemu-devel] [PATCH 1/8] qdict: fix unbounded stack for qdict_array_entries, Peter Xu, 2016/03/08
- Re: [Qemu-devel] [PATCH 1/8] qdict: fix unbounded stack for qdict_array_entries, Kevin Wolf, 2016/03/09
- Re: [Qemu-devel] [PATCH 1/8] qdict: fix unbounded stack for qdict_array_entries, Markus Armbruster, 2016/03/09
- Re: [Qemu-devel] [PATCH 1/8] qdict: fix unbounded stack for qdict_array_entries, Kevin Wolf, 2016/03/09
- Re: [Qemu-devel] [PATCH 1/8] qdict: fix unbounded stack for qdict_array_entries, Markus Armbruster, 2016/03/09
- Re: [Qemu-devel] [PATCH 1/8] qdict: fix unbounded stack for qdict_array_entries, Peter Xu, 2016/03/09
[Qemu-devel] [PATCH 2/8] block: fix unbounded stack for dump_qdict, Peter Xu, 2016/03/08