linux-kernel - Re: [PATCH v6 22/25] x86/asm: annotate indirect jumps

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Message-ID: <20201015102216.GB2611@hirez.programming.kicks-ass.net>
Date:   Thu, 15 Oct 2020 12:22:16 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Jann Horn <jannh@...gle.com>
Cc:     Sami Tolvanen <samitolvanen@...gle.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        the arch/x86 maintainers <x86@...nel.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Will Deacon <will@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Kernel Hardening <kernel-hardening@...ts.openwall.com>,
        linux-arch <linux-arch@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-kbuild@...r.kernel.org,
        kernel list <linux-kernel@...r.kernel.org>,
        linux-pci@...r.kernel.org
Subject: Re: [PATCH v6 22/25] x86/asm: annotate indirect jumps

On Thu, Oct 15, 2020 at 01:23:41AM +0200, Jann Horn wrote:

> It would probably be good to keep LTO and non-LTO builds in sync about
> which files are subjected to objtool checks. So either you should be
> removing the OBJECT_FILES_NON_STANDARD annotations for anything that
> is linked into the main kernel (which would be a nice cleanup, if that
> is possible), 

This, I've had to do that for a number of files already for the limited
vmlinux.o passes we needed for noinstr validation.