linux-kernel - Re: [PATCH] binfmt_elf: remove the 4k limitation of program header size

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Message-ID: <202508040815.0BB8B41AD@keescook>
Date: Mon, 4 Aug 2025 08:16:32 -0700
From: Kees Cook <kees@...nel.org>
To: Yin Fengwei <nh26223@...yun.com>
Cc: Ismael Luceno <ismael@...ev.co.uk>,
	Yin Fengwei <fengwei_yin@...ux.alibaba.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	zhourundong.zrd@...ux.alibaba.com
Subject: Re: [PATCH] binfmt_elf: remove the 4k limitation of program header
 size

On Mon, Aug 04, 2025 at 10:00:41PM +0800, Yin Fengwei wrote:
> If this is really a concern, we can add 4K restriction only for
> noMMU. Thanks.

My point is that the headers are loaded via elf_read()/kernel_read().
There is no direct mapping, etc, that would result in some single page;
it's already bounds checked, loaded into a distinct memory area, etc.

-- 
Kees Cook