From: Matthew Kerwin <matthew@...>
Date: 2013-03-21T10:31:45+09:00
Subject: [ruby-core:53588] Re: Consistent hashing in the face of HashDOS?

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On 21 March 2013 10:50, Shota Fukumori (sora_h) <sorah@tubusu.net> wrote:

> hi,
>
> On Thu, Mar 21, 2013 at 9:03 AM, Charles Oliver Nutter
> <headius@headius.com> wrote:
> > My question for ruby-core: at what point did you decide to make hash
> > for e.g. nil not be a single value (it was "4" in 1.8.7 and
> > different/random in 1.9.3+), and why did you do it?
>
> Wait, `nil.id` returns NoMethodError, `nil.__id__` returns '4' (1.9.3)
> or '8' (2.0.0+),
> not a random value.
>

In 1.8, nil.hash => 4
In 1.9, nil.hash => random Fixnum, e.g. 192286870168610551
Ditto 2.0

-- 
  Matthew Kerwin, B.Sc (CompSci) (Hons)
  http://matthew.kerwin.net.au/

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<div dir=3D"ltr"><div class=3D"gmail_extra"><div class=3D"gmail_quote">On 2=
1 March 2013 10:50, Shota Fukumori (sora_h) <span dir=3D"ltr">&lt;<a href=
=3D"mailto:sorah@tubusu.net" target=3D"_blank">sorah@tubusu.net</a>&gt;</sp=
an> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left:1px solid rgb(204,204,204);padding-left:1ex">hi,<br>
<div class=3D"im"><br>
On Thu, Mar 21, 2013 at 9:03 AM, Charles Oliver Nutter<br>
&lt;<a href=3D"mailto:headius@headius.com">headius@headius.com</a>&gt; wrot=
e:<br>
&gt; My question for ruby-core: at what point did you decide to make hash<b=
r>
&gt; for e.g. nil not be a single value (it was &quot;4&quot; in 1.8.7 and<=
br>
&gt; different/random in 1.9.3+), and why did you do it?<br>
<br>
</div>Wait, `<a href=3D"http://nil.id" target=3D"_blank">nil.id</a>` return=
s NoMethodError, `nil.__id__` returns &#39;4&#39; (1.9.3)<br>
or &#39;8&#39; (2.0.0+),<br>
not a random value.<br></blockquote></div><br></div><div class=3D"gmail_ext=
ra">In 1.8, nil.hash =3D&gt; 4<br></div><div class=3D"gmail_extra">In 1.9, =
nil.hash =3D&gt; random Fixnum, e.g. 192286870168610551<br></div><div class=
=3D"gmail_extra">
Ditto 2.0<br></div><div class=3D"gmail_extra"></div><div class=3D"gmail_ext=
ra"><br>-- <br><div dir=3D"ltr">=A0 Matthew Kerwin, B.Sc (CompSci) (Hons)<b=
r>=A0 <a href=3D"http://matthew.kerwin.net.au/" target=3D"_blank">http://ma=
tthew.kerwin.net.au/</a></div>

</div></div>

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