linux-kernel - Re: [PATCH v2 24/28] KVM: arm64: disable LTO for the nVHE directory

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Message-ID: <202009031545.42ECDC8F7F@keescook>
Date:   Thu, 3 Sep 2020 15:45:31 -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 24/28] KVM: arm64: disable LTO for the nVHE directory

On Thu, Sep 03, 2020 at 01:30:49PM -0700, 'Sami Tolvanen' via Clang Built Linux wrote:
> We use objcopy to manipulate ELF binaries for the nvhe code,
> which fails with LTO as the compiler produces LLVM bitcode
> instead. Disable LTO for this code to allow objcopy to be used.
> 
> Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>

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

-- 
Kees Cook