linux-hardening - Re: [PATCH 4/4] vmlinux.lds.h: Have ORC lookup cover entire _etext

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Date:   Wed, 13 Oct 2021 17:29:41 -0700
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     Borislav Petkov <bp@...e.de>,
        Kristen Carlson Accardi <kristen@...ux.intel.com>,
        Tony Luck <tony.luck@...el.com>,
        Alexander Lobakin <alexandr.lobakin@...el.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Arnd Bergmann <arnd@...db.de>, Joerg Roedel <jroedel@...e.de>,
        Arvind Sankar <nivedita@...m.mit.edu>,
        Jing Yangyang <jing.yangyang@....com.cn>,
        Abaci Robot <abaci@...ux.alibaba.com>,
        Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Miroslav Benes <mbenes@...e.cz>,
        "H. Nikolaus Schaller" <hns@...delico.com>,
        Fangrui Song <maskray@...gle.com>,
        linux-kernel@...r.kernel.org, x86@...nel.org,
        linux-arch@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH 4/4] vmlinux.lds.h: Have ORC lookup cover entire _etext -
 _stext

On Wed, Oct 13, 2021 at 10:57:42AM -0700, Kees Cook wrote:
> From: Kristen Carlson Accardi <kristen@...ux.intel.com>
> 
> When using -ffunction-sections to place each function in its own text
> section (so it can be randomized at load time in the future FGKASLR
> series), the linker will place most of the functions into separate .text.*
> sections. SIZEOF(.text) won't work here for calculating the ORC lookup
> table size, so the total text size must be calculated to include .text
> AND all .text.* sections.
> 
> Signed-off-by: Kristen Carlson Accardi <kristen@...ux.intel.com>
> Reviewed-by: Tony Luck <tony.luck@...el.com>
> Tested-by: Tony Luck <tony.luck@...el.com>
> Reviewed-by: Kees Cook <keescook@...omium.org>
> [ alobakin: move it to vmlinux.lds.h and make arch-indep ]
> Signed-off-by: Alexander Lobakin <alexandr.lobakin@...el.com>
> Signed-off-by: Kees Cook <keescook@...omium.org>

Acked-by: Josh Poimboeuf <jpoimboe@...hat.com>

-- 
Josh