linux-kernel - Re: [PATCH 0/3] objtool: add support for >64k sections

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Message-ID: <202004211310.BF5AE73@keescook>
Date:   Tue, 21 Apr 2020 13:11:04 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Sami Tolvanen <samitolvanen@...gle.com>
Cc:     Josh Poimboeuf <jpoimboe@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-kernel@...r.kernel.org,
        Kristen Carlson Accardi <kristen@...ux.intel.com>
Subject: Re: [PATCH 0/3] objtool: add support for >64k sections

On Tue, Apr 21, 2020 at 11:07:21AM -0700, Sami Tolvanen wrote:
> This series fixes objtool for binaries with >64k sections, and
> includes optimizations to reduce the runtime for a binary with
> ~130k sections from >15 minutes to ~4 seconds.
> 
> Sami Tolvanen (3):
>   objtool: use gelf_getsymshndx to handle >64k sections
>   objtool: optimize insn_hash for split sections
>   objtool: optimize add_dead_ends for split sections
> 
>  tools/objtool/check.c | 48 ++++++++++++++++++++++++++-----------------
>  tools/objtool/check.h |  9 ++++++++
>  tools/objtool/elf.c   | 24 +++++++++++++++-------
>  tools/objtool/elf.h   |  1 +
>  4 files changed, 56 insertions(+), 26 deletions(-)
> 
> 
> base-commit: ae83d0b416db002fe95601e7f97f64b59514d936

Awesome; thanks for sending these. I suspect they'll help with FGKASLR
as well.

-- 
Kees Cook