linux-kernel - Re: [PATCH 1/3] binfmt_elf_fdpic: fix AUXV size calculation for ELF_HWCAP3 and ELF

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Message-ID: <79af0c28-9423-40ac-840f-ccf0ca676bf1@sirena.org.uk>
Date: Thu, 8 Jan 2026 11:31:46 +0000
From: Mark Brown <broonie@...nel.org>
To: Andrei Vagin <avagin@...gle.com>
Cc: Kees Cook <kees@...nel.org>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
	criu@...ts.linux.dev, Andrew Morton <akpm@...ux-foundation.org>,
	Chen Ridong <chenridong@...wei.com>,
	Christian Brauner <brauner@...nel.org>,
	David Hildenbrand <david@...nel.org>,
	Eric Biederman <ebiederm@...ssion.com>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	Michal Koutny <mkoutny@...e.com>, Max Filippov <jcmvbkbc@...il.com>
Subject: Re: [PATCH 1/3] binfmt_elf_fdpic: fix AUXV size calculation for
 ELF_HWCAP3 and ELF_HWCAP4

On Thu, Jan 08, 2026 at 05:07:46AM +0000, Andrei Vagin wrote:
> Commit 4e6e8c2b757f ("binfmt_elf: Wire up AT_HWCAP3 at AT_HWCAP4") added
> support for AT_HWCAP3 and AT_HWCAP4, but it missed updating the AUX
> vector size calculation in create_elf_fdpic_tables() and
> AT_VECTOR_SIZE_BASE in include/linux/auxvec.h.
> 
> Similar to the fix for ELF_HWCAP2 in commit c6a09e342f8e
> ("binfmt_elf_fdpic: fix AUXV size calculation when ELF_HWCAP2 is defined"),
> this omission leads to a mismatch between the reserved space and the
> actual number of AUX entries, eventually triggering a kernel BUG_ON(csp != sp).

Sorry, missed fdpic here:

Reviewed-by: Mark Brown <broonie@...nel.org>

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