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

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Message-ID: <xd6zp5ytq6iakxkqoqqtseomgu5oohau4ynj3xbo7ejohpv7dv@skp2v7awzab4>
Date: Sat, 19 Jul 2025 17:17:09 +0800
From: YinFengwei <fengwei_yin@...ux.alibaba.com>
To: Kees Cook <kees@...nel.org>
Cc: 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 Thu, Jul 17, 2025 at 04:31:50PM +0800, Kees Cook wrote:
> On Thu, 17 Jul 2025 19:01:08 +0800, fengwei_yin@...ux.alibaba.com wrote:
> > We have assembly code generated by a script. GCC successfully compiles
> > it. However, the kernel cannot load it on an ARM64 platform with a 4K
> > page size. In contrast, the same ELF file loads correctly on the same
> > platform with a 64K page size.
> > 
> > The root cause is the Linux kernel's ELF_MIN_ALIGN limitation on the
> > program headers of ELF files. The ELF file contains 78 program headers
> > (the script inserts many holes when generating the assembly code). On
> > ARM64 with a 4K page size, the ELF_MIN_ALLIGN enforces a maximum of 74
> > program headers, causing the ELF file to fail. However, with a 64K page
> > size, the ELF_MIN_ALIGN is relaxed to over 1,184 program headers, allowing
> > the file to run correctly.
> > 
> > [...]
> 
> Applied to for-next/execve, thanks!
Cook, thanks a lot.

Regards
Yin, Fengwei

> 
> [1/1] binfmt_elf: remove the 4k limitation of program header size
>       https://git.kernel.org/kees/c/8030790477e8
> 
> Take care,
> 
> -- 
> Kees Cook