linux-kernel - Re: [PATCH v2 27/28] x86, relocs: Ignore L4_PAGE

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Date:   Thu, 3 Sep 2020 15:47:32 -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 27/28] x86, relocs: Ignore L4_PAGE_OFFSET relocations

On Thu, Sep 03, 2020 at 01:30:52PM -0700, Sami Tolvanen wrote:
> L4_PAGE_OFFSET is a constant value, so don't warn about absolute
> relocations.
> 
> Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>

Any other details on this? I assume this is an ld.lld-ism. Any idea why
this is only a problem under LTO? (Or is this an LLVM integrated
assembler-ism?) Regardless, yes, let's nail it down:

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

-- 
Kees Cook