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From: "Carlos O'Donell" <carlos@systemhalted.org>
Date: Fri, 9 Apr 2021 13:17:31 -0400
Message-ID: <CAE2sS1g91Z=_AuvkX-AbMNNtp83MOyrSv=bdQqbXXYT2wT14Uw@mail.gmail.com>
Subject: Re: Is there a way to distinguish binary files compiled with
 -D_FORTIFY_SOURCE=1 and -D_FORTIFY_SOURCE=2?
To: Peng Yu <pengyu.ut@gmail.com>
Cc: libc-help <libc-help@sourceware.org>
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On Thu, Apr 8, 2021 at 8:12 PM Peng Yu via Libc-help
<libc-help@sourceware.org> wrote:
>
> https://gcc.gnu.org/legacy-ml/gcc-patches/2004-09/msg02055.html
>
> When I compile a .c file with -D_FORTIFY_SOURCE=1 and
> -D_FORTIFY_SOURCE=2, the binary files both contain symbols like
> ..._chk@...
>
> So I can not tell whether _FORTIFY_SOURCE is 1 or 2 just by whether
> symbols have ..._chk@....
>
> Is there a way to tell the difference only from the binary file?

If you want to know about this feature you want to know about all the features.

In Fedora and in RHEL we use annobin to answer this question:
https://fedoraproject.org/wiki/Changes/Annobin

Cheers,
Carlos.