From: Kees Cook <kees@kernel.org>
To: "Thomas Weißschuh" <thomas.weissschuh@linutronix.de>
Cc: Arnd Bergmann <arnd@arndb.de>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-riscv@lists.infradead.org, loongarch@lists.linux.dev,
linux-s390@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
linux-mips@vger.kernel.org, sparclinux@vger.kernel.org,
linux-sh@vger.kernel.org, linux-alpha@vger.kernel.org
Subject: Re: [PATCH 00/15] exec: Remove AT_VECTOR_SIZE_ARCH from UAPI
Date: Wed, 18 Mar 2026 09:22:26 -0700 [thread overview]
Message-ID: <202603180921.1B52D626@keescook> (raw)
In-Reply-To: <20260302-at-vector-size-arch-v1-0-a11f03ba2ca8@linutronix.de>
On Mon, Mar 02, 2026 at 01:25:24PM +0100, Thomas Weißschuh wrote:
> There is nothing userspace can do with this value. In the kernel is
> always combined with AT_VECTOR_SIZE_BASE, which is not exposed to
> userspace and also changes from time to time.
>
> Move the symbol to kernel-internal headers.
>
> Meant to be applied through the asm-generic tree.
> The default recipient list was huge. I trimmed it to only the
> architecture lists.
I don't see anything in Debian Code Search that actually uses this
symbol, so that seems fine. Userspace already parses auxvec looking for
AT_NULL, so length isn't useful.
Reviewed-by: Kees Cook <kees@kernel.org>
>
> Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
> ---
> Thomas Weißschuh (15):
> MAINTAINERS: exec: Add more auxvec.h variants
> auxvec.h: Move AT_VECTOR_SIZE definitions to linux/auxvec.h
> asm-generic: add an in-kernel auxvec.h header
> ARM: drop custom asm/auxvec.h
> x86: Remove AT_VECTOR_SIZE_ARCH from UAPI
> arm64: Remove AT_VECTOR_SIZE_ARCH from UAPI
> RISC-V: Remove AT_VECTOR_SIZE_ARCH from UAPI
> LoongArch: Remove AT_VECTOR_SIZE_ARCH from UAPI
> s390: Remove AT_VECTOR_SIZE_ARCH from UAPI
> powerpc: Remove AT_VECTOR_SIZE_ARCH from UAPI
> MIPS: Remove AT_VECTOR_SIZE_ARCH from UAPI
> sparc: Remove AT_VECTOR_SIZE_ARCH from UAPI
> sh: Remove AT_VECTOR_SIZE_ARCH from UAPI
> alpha: remove AT_VECTOR_SIZE_ARCH from UAPI
> auxvec.h: Drop fallback AT_VECTOR_SIZE_ARCH
>
> MAINTAINERS | 5 +++++
> arch/alpha/include/asm/auxvec.h | 7 +++++++
> arch/alpha/include/uapi/asm/auxvec.h | 8 +++-----
> arch/arm/include/asm/auxvec.h | 1 -
> arch/arm64/include/asm/auxvec.h | 7 +++++++
> arch/arm64/include/uapi/asm/auxvec.h | 6 ++----
> arch/loongarch/include/asm/auxvec.h | 14 ++++++++++++++
> arch/loongarch/include/uapi/asm/auxvec.h | 8 +++-----
> arch/mips/include/asm/auxvec.h | 17 +++++++++++++++++
> arch/mips/include/uapi/asm/auxvec.h | 8 +++-----
> arch/powerpc/include/asm/auxvec.h | 7 +++++++
> arch/powerpc/include/uapi/asm/auxvec.h | 6 ++----
> arch/riscv/include/asm/auxvec.h | 13 +++++++++++++
> arch/riscv/include/uapi/asm/auxvec.h | 2 --
> arch/s390/include/asm/auxvec.h | 7 +++++++
> arch/s390/include/uapi/asm/auxvec.h | 6 ++----
> arch/sh/include/asm/auxvec.h | 7 +++++++
> arch/sh/include/uapi/asm/auxvec.h | 8 +++-----
> arch/sparc/include/asm/auxvec.h | 6 ++++++
> arch/sparc/include/uapi/asm/auxvec.h | 8 +++-----
> arch/x86/include/asm/auxvec.h | 12 ++++++++++++
> arch/x86/include/uapi/asm/auxvec.h | 13 +++----------
> include/asm-generic/Kbuild | 1 +
> include/asm-generic/auxvec.h | 7 +++++++
> include/linux/auxvec.h | 5 +++++
> include/linux/mm_types.h | 6 ------
> 26 files changed, 139 insertions(+), 56 deletions(-)
> ---
> base-commit: f6b3b0a4c85882ad75bce3b093173203e3f39f28
> change-id: 20260109-at-vector-size-arch-6e0f2e9ff8b6
>
> Best regards,
> --
> Thomas Weißschuh <thomas.weissschuh@linutronix.de>
>
--
Kees Cook
prev parent reply other threads:[~2026-03-18 16:22 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-02 12:25 [PATCH 00/15] exec: Remove AT_VECTOR_SIZE_ARCH from UAPI Thomas Weißschuh
2026-03-02 12:25 ` [PATCH 01/15] MAINTAINERS: exec: Add more auxvec.h variants Thomas Weißschuh
2026-03-02 12:25 ` [PATCH 02/15] auxvec.h: Move AT_VECTOR_SIZE definitions to linux/auxvec.h Thomas Weißschuh
2026-03-02 12:25 ` [PATCH 03/15] asm-generic: add an in-kernel auxvec.h header Thomas Weißschuh
2026-03-02 12:25 ` [PATCH 04/15] ARM: drop custom asm/auxvec.h Thomas Weißschuh
2026-03-02 12:25 ` [PATCH 05/15] x86: Remove AT_VECTOR_SIZE_ARCH from UAPI Thomas Weißschuh
2026-03-02 12:25 ` [PATCH 06/15] arm64: " Thomas Weißschuh
2026-03-02 12:25 ` [PATCH 07/15] RISC-V: " Thomas Weißschuh
2026-03-19 14:27 ` Andy Chiu
2026-03-02 12:25 ` [PATCH 08/15] LoongArch: " Thomas Weißschuh
2026-03-02 12:25 ` [PATCH 09/15] s390: " Thomas Weißschuh
2026-03-02 12:25 ` [PATCH 10/15] powerpc: " Thomas Weißschuh
2026-03-02 12:25 ` [PATCH 11/15] MIPS: " Thomas Weißschuh
2026-03-02 12:25 ` [PATCH 12/15] sparc: " Thomas Weißschuh
2026-03-02 12:25 ` [PATCH 13/15] sh: " Thomas Weißschuh
2026-03-02 12:25 ` [PATCH 14/15] alpha: remove " Thomas Weißschuh
2026-03-18 6:16 ` Magnus Lindholm
2026-03-02 12:25 ` [PATCH 15/15] auxvec.h: Drop fallback AT_VECTOR_SIZE_ARCH Thomas Weißschuh
2026-03-18 16:22 ` Kees Cook [this message]
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