linux-hardening - Re: [PATCH 01/15] objtool: Find a destination for jumps beyond the section end

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Message-ID: <20210420181412.3g5dsyhggxnvif7k@treble>
Date:   Tue, 20 Apr 2021 13:14:12 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Sami Tolvanen <samitolvanen@...gle.com>
Cc:     x86@...nel.org, Kees Cook <keescook@...omium.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Sedat Dilek <sedat.dilek@...il.com>,
        linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com
Subject: Re: [PATCH 01/15] objtool: Find a destination for jumps beyond the
 section end

On Fri, Apr 16, 2021 at 01:38:30PM -0700, Sami Tolvanen wrote:
> With -ffunction-sections, Clang can generate a jump beyond the end of
> a section when the section ends in an unreachable instruction.

Why?  Can you show an example?

-- 
Josh