linux-kernel - Re: [PATCH v2 07/28] kbuild: add support for objtool mcount

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Message-ID: <202009031455.A305DD4F97@keescook>
Date:   Thu, 3 Sep 2020 14:56:09 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Sami Tolvanen <samitolvanen@...gle.com>
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@...glegroups.com,
        kernel-hardening@...ts.openwall.com, linux-arch@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kbuild@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        x86@...nel.org
Subject: Re: [PATCH v2 07/28] kbuild: add support for objtool mcount

On Thu, Sep 03, 2020 at 01:30:32PM -0700, 'Sami Tolvanen' via Clang Built Linux wrote:
> This change adds build support for using objtool to generate
> __mcount_loc sections.
> 
> Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>

Looks right to me. (There is probably an argument to be made to do all
of the tooling detection in the Kconfig, but that's a larger issues and
orthogonal to this fix, IMO.)

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

-- 
Kees Cook