[bug#27870] tor: Remove 'expensive-hardening' option.

[ng0]

Since no one has vetoed against this, here is my patch to
improve tor again. I had no issues in the 9+ days since
I've been using it like this (didn't expect any) and only
improvement of the current situation with tor.

Patch appended.

> ng0 writes:
> 
> > I noticed this before the contribution entered master, so this message
> > is not really a news.
> >
> > To quote myself from earlier today:
> >
> > <ng0>      I think we should revert one piece of the tor hardened build.. 3 
> > hours
> >            uptime: 684.3 MiB + 753.0 KiB = 685.1 MiB       tor
> >
> > Comparison: my Chromium with 55 tabs open uses 2.2GB.
> >
> >  Private  +   Shared  =  RAM used       Program
> > … 
> >  12.4 MiB +   1.1 MiB =  13.4 MiB       vim
> >  15.5 MiB + 959.0 KiB =  16.4 MiB       Xorg
> >  17.3 MiB +   5.6 MiB =  22.9 MiB       guix substitute
> >  22.8 MiB +   1.3 MiB =  24.1 MiB       shepherd
> >  26.7 MiB + 551.5 KiB =  27.3 MiB       emacs-25.2
> > 131.1 MiB +   6.2 MiB = 137.3 MiB       .guix-real
> > 732.7 MiB + 932.0 KiB = 733.6 MiB       tor
> > …
> > uptime: 6:24h
> >
> > Now I wouldn't consider tor to be problematic when this would be the
> > default for tor. But it isn't, and --enable-expensive-hardening is an
> > experimental function which is not enabled by default from upstream (as
> > all our recently added config options for tor (not sure right now if all
> > are experimental, but they are not standard).
> >
> > Comparison, Debian running for a very long time (months) and using the
> > same config:
> >
> >  40.6 MiB + 486.0 KiB =  41.1 MiB       tor
> >
> >
> > I'm convinced that removing --enable-expensive-hardening will improve
> > the situation, I have watched an VM with tor without this config switch.
> > Whoever needs or wants this switch can make use of the easy way to
> > create custom packages in Guix.
> >
> > If someone else can confirm my observations, I'll prepare an patch.
> 
> The top(1) command tells me that tor is taking up just short of a
> gigabyte of RAM. I haven't tried disabling the --enable-expensive-hardening
> flag, yet.

-- 
ng0
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0001-gnu-tor-Remove-enable-expensive-hardening-option.patch
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