[Bug gdb/30847] gdbtypes.c:3355: internal-error causes gdb to abort when setting breakpoint

["dbrumley at forallsecure dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30847

--- Comment #5 from David Brumley <dbrumley at forallsecure dot com> ---
Hi,

First, thank you for helping me understand the issue.  Your deep knowledge and
fast response times to something as weird as my bug report are much
appreciated.

I felt you might be interested in the lecture, and not sure that was useful for
the list.

Here are my slides, with the particular CVE starting on page 21:
https://docs.google.com/presentation/d/1z_XJWrHgoJrmVcJQHCKth_lx0Olz39e-VXC_tW9imfk/

* I'm a big believer in the growth mindset, so if you happen to look and see
something wrong, please let me know! It's how I get better!

* As you can see, I ended up building from source code anyway.

Editing the symbol table was pretty easy.  I've done it manually in the past,
but I found a very nice library called lief recently.

import lief
binary = lief.parse('extract75')
errno = next(filter(lambda e: e.name ( http://e.name/ ) == "errno",
binary.symbols))
stdin = next(filter(lambda e: e.name ( http://e.name/ ) == "stdin",
binary.symbols))
errno.name ( http://errno.name/ ) = stdin.name ( http://stdin.name/ )
binary.write('extract75-hacked')

Thanks again!

Best wishes,

David

Dr. David Brumley

CEO
Executive Assistant: Teressa Peirona < teressa@forallsecure.com >

On Wed, Sep 20, 2023 at 7:07 PM, tromey at sourceware dot org <
sourceware-bugzilla@sourceware.org > wrote:

> 
> 
> 
> https:/ / sourceware. org/ bugzilla/ show_bug. cgi?id=30847 (
> https://sourceware.org/bugzilla/show_bug.cgi?id=30847 )
> 
> 
> 
> --- Comment #4 from Tom Tromey <tromey at sourceware dot org> --- I
> totally misread that as you rebuilding your program -- but you rebuilt gdb
> (which you said...).
> Sorry about that. Anyway this bug is probably not hard to fix, and the
> backtrace is handy for diagnosing w/o sources. So, thank you.
> 
> 
> 
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