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From: "Dmitry V. Levin" <ldv@altlinux.org>
To: ALT Devel discussion list <devel@lists.altlinux.org>
Subject: Re: [devel] [SCM] packages/apt: tags/0.5.15lorg2-alt74
Date: Tue, 22 Oct 2019 18:32:59 +0300
Message-ID: <20191022153259.GA1096@altlinux.org> (raw)
In-Reply-To: <ef031c47-e00e-3224-6d94-67d0f27b635f@basealt.ru>

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On Tue, Oct 22, 2019 at 03:28:40PM +0300, Anton Farygin wrote:
> On 22.10.2019 11:32, Dmitry V. Levin wrote:
> > On Tue, Oct 22, 2019 at 03:01:16AM +0300, Michael Shigorin wrote:
> >> On Tue, Oct 22, 2019 at 02:42:06AM +0300, Dmitry V. Levin wrote:
> >>> On Tue, Sep 17, 2019 at 09:05:15AM +0000, Aleksei Nikiforov wrote:
> >>>> Update of /people/darktemplar/packages/apt.git
> >>>>      0.5.15lorg2-alt74
> >>>>      - Added debugging output for allocation functions.
> >>>>      - Fixed dynamic memory allocation pointer arithmetics issue.
> >>> Жаль, что вы не дождались первого апреля, но всё равно спасибо,
> >>> шутка получилась отличная.
> >> В смысле про fixed?
> > Именно.
> >
> > Этот патч увеличивает расход оперативной памяти apt'ом в среднем в полтора
> > раза, но не исправляет UB с арифметикой указателей, поскольку MMap::Base
> > как был невыровненным, так и остался невыровненным.  В отличие от Debian,
> > между прочим, где по умолчанию MMap::Base выровнен на начало страницы.
> >
> Я не вижу разницы в адресе MMap::Base на Debian и у нас - в обоих 
> случаях он выровнен на начало страницы.

У Алексея:

      void *tmp_base = realloc(Base, newSize);

      if (debug_grow)
         _error->Warning(_("DynamicMMap::Grow: realloc from %llu to %llu, result: %s"), WorkSpace, newSize, (tmp_base == n

      if (tmp_base == NULL)
         return false;

      Base = tmp_base;

В Debian по умолчанию:

   #ifdef MREMAP_MAYMOVE

                if ((Flags & Moveable) == Moveable)
                        Base = mremap(Base, WorkSpace, newSize, MREMAP_MAYMOVE);
                else
   #endif
                        Base = mremap(Base, WorkSpace, newSize, 0);

                if(Base == MAP_FAILED)
                        return false;

Всё ещё не видно разницы?


-- 
ldv

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  parent reply	other threads:[~2019-10-22 15:32 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-21 23:42 ` Dmitry V. Levin
2019-10-22  0:01   ` Michael Shigorin
2019-10-22  8:32     ` Dmitry V. Levin
2019-10-22 12:28       ` Anton Farygin
2019-10-22 12:46         ` Anton Farygin
2019-10-22 15:32         ` Dmitry V. Levin [this message]
2019-10-22 15:51           ` Anton Farygin
2019-10-22 16:52           ` Ivan Zakharyaschev
2019-10-24 13:59           ` Aleksei Nikiforov
2019-10-24 15:10             ` Andrey Savchenko
2019-10-24 15:29               ` Aleksei Nikiforov
2019-10-24 15:50                 ` Andrey Savchenko
2019-10-24 16:01                   ` Aleksei Nikiforov
2019-10-24 16:54                     ` Andrey Savchenko
2019-10-25  7:23                       ` Aleksei Nikiforov
2019-10-22  4:06   ` Anton Farygin
2019-10-22 15:35     ` Alexey Tourbin
2019-10-23 12:46       ` Dmitry V. Levin
2019-10-24 13:58       ` Aleksei Nikiforov
2019-10-24 15:20   ` Ivan Zakharyaschev

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