linux-hardening - Re: [PATCH v4 4/6] binfmt_elf: Use elf

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Date: Fri, 29 Sep 2023 10:06:14 -0700
From: Kees Cook <keescook@...omium.org>
To: Pedro Falcato <pedro.falcato@...il.com>
Cc: Eric Biederman <ebiederm@...ssion.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Christian Brauner <brauner@...nel.org>,
	linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
	Sebastian Ott <sebott@...hat.com>,
	Thomas Weißschuh <linux@...ssschuh.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org,
	linux-arch@...r.kernel.org
Subject: Re: [PATCH v4 4/6] binfmt_elf: Use elf_load() for library

On Fri, Sep 29, 2023 at 01:12:13PM +0100, Pedro Falcato wrote:
> On Fri, Sep 29, 2023 at 4:24 AM Kees Cook <keescook@...omium.org> wrote:
> >
> > While load_elf_library() is a libc5-ism, we can still replace most of
> > its contents with elf_load() as well, further simplifying the code.
> 
> While I understand you want to break as little as possible (as the ELF
> loader maintainer), I'm wondering if we could axe CONFIG_USELIB
> altogether? Since CONFIG_BINFMT_AOUT also got axed. Does this have
> users anywhere?

I can't even find a libc5 image I can test. :P

I made it non-default in '22:

7374fa33dc2d ("init/Kconfig: remove USELIB syscall by default")

I'm not sure we can drop it entirely, though.

-- 
Kees Cook