linux-kernel - Re: [PATCH 01/12] extarray: define helpers for arrays defined in linker scripts

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Message-ID: <CA+55aFxbUd6kZH0ugn-Ss5CqE=MttGD=WChzahAp1k-XFcr7xA@mail.gmail.com>
Date:   Wed, 2 Nov 2016 09:02:06 -0600
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Richard Biener <rguenther@...e.de>
Cc:     Markus Trippelsdorf <markus@...ppelsdorf.de>,
        Peter Zijlstra <peterz@...radead.org>,
        "Luis R. Rodriguez" <mcgrof@...nel.org>,
        Vegard Nossum <vegard.nossum@...cle.com>,
        Jiri Slaby <jslaby@...e.cz>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable <stable@...r.kernel.org>,
        Ming Lei <ming.lei@...onical.com>,
        Steven Rostedt <srostedt@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Cesar Eduardo Barros <cesarb@...arb.eti.br>,
        Michael Matz <matz@...e.de>,
        David Miller <davem@...emloft.net>,
        Guenter Roeck <linux@...ck-us.net>,
        Fengguang Wu <fengguang.wu@...el.com>,
        Borislav Petkov <bp@...en8.de>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH 01/12] extarray: define helpers for arrays defined in
 linker scripts

On Wed, Nov 2, 2016 at 6:14 AM, Richard Biener <rguenther@...e.de> wrote:
>
> Note while this change restored the old behavior this change was _not_
> intended to fix this particular fallout (it was to fix an inconsistency
> with respect to comparing addresses of symbols that can be interposed).
> It just happens that your externs can be interposed with ELF.

I think it should in general work for the kernel too, since as far as
I can tell, it fundamentally fixes the issue that linker scripts will
set symbol addresses to possibly alias other symbols.

So from a compiler standpoint, I think our "begin/end" linker script
symbols can be seen as interposing a larger array and give bounds for
it. No>

                  Linus