linux-kernel - Re: [PATCH v3 05/10] x86: Make sure

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Message-ID: <202006232152.733212868D@keescook>
Date:   Tue, 23 Jun 2020 21:52:08 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Kristen Carlson Accardi <kristen@...ux.intel.com>
Cc:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>, Arnd Bergmann <arnd@...db.de>,
        arjan@...ux.intel.com, linux-kernel@...r.kernel.org,
        kernel-hardening@...ts.openwall.com, rick.p.edgecombe@...el.com,
        Tony Luck <tony.luck@...el.com>, linux-arch@...r.kernel.org
Subject: Re: [PATCH v3 05/10] x86: Make sure _etext includes function sections

On Tue, Jun 23, 2020 at 10:23:22AM -0700, Kristen Carlson Accardi wrote:
> When using -ffunction-sections to place each function in
> it's own text section so it can be randomized at load time, the
> linker considers these .text.* sections "orphaned sections", and
> will place them after the first similar section (.text). In order
> to accurately represent the end of the text section and the
> orphaned sections, _etext must be moved so that it is after both
> .text and .text.* The text size must also be calculated to
> include .text AND .text.*
> 
> Signed-off-by: Kristen Carlson Accardi <kristen@...ux.intel.com>

Reviewed-by: Kees Cook <keescook@...omium.org>

-- 
Kees Cook