linux-kernel - Re: [PATCH v3 13/30] kbuild: lto: postpone objtool

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Date:   Mon, 21 Sep 2020 11:58:19 -0700
From:   Sami Tolvanen <samitolvanen@...gle.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        Will Deacon <will@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Paul E. McKenney" <paulmck@...nel.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-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kbuild <linux-kbuild@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>, linux-pci@...r.kernel.org,
        X86 ML <x86@...nel.org>
Subject: Re: [PATCH v3 13/30] kbuild: lto: postpone objtool

Nick and 0-day bot both let me know that there's a typo in this patch,
which I'll fix in v4:

diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index f7daa59ff14f..00d7baaf7949 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -223,7 +223,7 @@ dtc_cpp_flags  = -Wp,-MMD,$(depfile).pre.tmp
-nostdinc                    \
 objtool_args =                                                         \
        $(if $(CONFIG_UNWINDER_ORC),orc generate,check)                 \
        $(if $(part-of-module), --module,)                              \
-       $(if $(CONFIG_FRAME_POINTER), --no-fp,)                         \
+       $(if $(CONFIG_FRAME_POINTER),, --no-fp)                         \
        $(if $(CONFIG_GCOV_KERNEL), --no-unreachable,)                  \
        $(if $(CONFIG_RETPOLINE), --retpoline,)                         \
        $(if $(CONFIG_X86_SMAP), --uaccess,)                            \

Sami

On Fri, Sep 18, 2020 at 2:27 PM Kees Cook <keescook@...omium.org> wrote:
>
> On Fri, Sep 18, 2020 at 01:14:19PM -0700, Sami Tolvanen wrote:
> > With LTO, LLVM bitcode won't be compiled into native code until
> > modpost_link, or modfinal for modules. This change postpones calls
> > to objtool until after these steps, and moves objtool_args to
> > Makefile.lib, so the arguments can be reused in Makefile.modfinal.
> >
> > Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>
>
> Thanks for reorganizing this!
>
> Reviewed-by: Kees Cook <keescook@...omium.org>
>
> --
> Kees Cook
>
> --
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