linux-kernel - Re: [PATCH 3/3] objtool: optimize add_dead

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Message-ID: <202004211315.BE5B8D94FE@keescook>
Date:   Tue, 21 Apr 2020 13:17:32 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     Sami Tolvanen <samitolvanen@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] objtool: optimize add_dead_ends for split sections

On Tue, Apr 21, 2020 at 03:13:05PM -0500, Josh Poimboeuf wrote:
> BTW, just curious, what's your use case for -ffunction-sections?  Is it
> for fgkaslr?

Both Sami's LTO+CFI work[1] and Kristen's FGKASLR series use it.

-Kees

[1] https://github.com/samitolvanen/linux/commits/clang-cfi
    https://lwn.net/Articles/810077/

-- 
Kees Cook