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From: "fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug libc/11884] Unbounded alloca() in node parameter of getaddrinfo()
Date: Mon, 30 Jun 2014 17:24:00 -0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=11884

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |fweimer at redhat dot com
              Flags|                            |security+

--- Comment #10 from Florian Weimer <fweimer at redhat dot com> ---
(In reply to Kees Cook from comment #5)
> Looks like this issue may be getting mitigated in other ways already:
> 
> $ ./getaddrinfo 100
> getaddrinfo: Connection timed out
> $ ./getaddrinfo 1000
> getaddrinfo: Invalid argument

You would have to use a much larger argument, probably something around this:

$ ./getaddrinfo 16000000

I haven't got an unpatched glibc 2.7 around to test.

This may have been fixed by 34a9094f49241ebb72084c536cf468fd51ebe3ec, which
went into glibc 2.14.  It has been backported by some downstream distributions,
e.g. <https://bugzilla.redhat.com/show_bug.cgi?id=797096>.

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