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b=DWAXZGnFfOEN9+DAz0dsY+Lqoy9HA3vYyZrVuWYZ8n+ibZNbqX1r9gqtrjbUTfhO6 ZU6Oe1QQaQKvaGSpMDB3HDmU1yBbd+SvhGzFBUMwNNQ93Hzch9LYGVGRW5/MG3b5Cc tiE+1a079qDWrM3gNv1qkR2cuNn9TAVP0lq2eEzEstXJWABDn3X+5Kq8QNaEl4hEjw 7W9p4upAchQod9Zm7wS5S/OiMNhO+86XZXIdd30F9K8Av4xY8QAqL7xSqPzgr8OIus AGCy8LvPWFk9a5vSzM1s+V9O71gN4hZOXX58eOXCxjBqUJH76qohwqeq7VvK0GlLKT aiTTGIxIx4wkA== From: Kees Cook To: linux-kernel@vger.kernel.org, linux-mm@kvack.org, fengwei_yin@linux.alibaba.com Cc: Kees Cook , zhourundong.zrd@linux.alibaba.com Subject: Re: [PATCH] binfmt_elf: remove the 4k limitation of program header size Date: Thu, 17 Jul 2025 16:31:50 -0700 Message-Id: <175279510782.2985357.8915174612817966643.b4-ty@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250717110108.55586-1-fengwei_yin@linux.alibaba.com> References: <20250717110108.55586-1-fengwei_yin@linux.alibaba.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 5B19E40005 X-Stat-Signature: h1mbxbgh6ft7j811ogxrb48d67pexczz X-Rspam-User: X-HE-Tag: 1752795115-906343 X-HE-Meta: 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 GeuRQdv3 f4JiwdPIccHQUAwqhmauyeI+CA8j7gBYYi7mHo/4dlLEt4p3iJArG1vrrMjPxPnAhB4DQxIpEx+/UsOJdsnY0/eUfzjPptHpU8hQQBrpl1dkATYGuNkRM7IXKMEtnnTBNBw1/XQShcyDIVRNeRhb9/SRilbkt5P0rsz1XP62KAEhzkOO48bzJ7F9A5ElXhygE9vQrWPs6WvEJBn8Nob7ueu0oVEzXmfmJ2pqQflq1gpqZ2AUmGk59IgjCuFuERTUwHF8eyHj51/yZc++Ajqlp6J1Tjw== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, 17 Jul 2025 19:01:08 +0800, fengwei_yin@linux.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! [1/1] binfmt_elf: remove the 4k limitation of program header size https://git.kernel.org/kees/c/8030790477e8 Take care, -- Kees Cook