linux-kernel - Re: [PATCH V2] x86/boot: explicitly place .eh

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Message-ID: <20191118175223.GM6363@zn.tnic>
Date:   Mon, 18 Nov 2019 18:52:23 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Ilie Halip <ilie.halip@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Andy Lutomirski <luto@...nel.org>
Subject: Re: [PATCH V2] x86/boot: explicitly place .eh_frame after .rodata

On Mon, Nov 18, 2019 at 09:46:23AM -0800, Nick Desaulniers wrote:
> Yep. Looks like:
> - arch/x86/kernel/vmlinux.lds.S
> - arch/x86/realmode/rm/realmode.lds.S
> 
> discard .eh_frame, while
> - arch/x86/entry/vdso/vdso-layout.lds.S
> - arch/x86/um/vdso/vdso-layout.lds.S
> 
> keep it.  I assume then that just vdso code that get linked into
> userspace needs to preserve this.

Yap, that's what I think too. Lemme add Andy to Cc.

> This suggestion would be a functional change, which is why we pursued
> the conservative change preserving it.

Sure but what would be the purpose of preserving the section, especially
in the early boot code? At least I don't see one. And kernel-proper
kills it...

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette