netdev - Re: [PATCH v2 3/4] arch: copy_thread: pass clone

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Message-ID: <72558e21-2ebf-448a-a93a-3d1a3181a592@redhat.com>
Date: Mon, 1 Sep 2025 15:39:44 +0200
From: David Hildenbrand <david@...hat.com>
To: schuster.simon@...mens-energy.com, Dinh Nguyen <dinguyen@...nel.org>,
 Christian Brauner <brauner@...nel.org>, Arnd Bergmann <arnd@...db.de>,
 Andrew Morton <akpm@...ux-foundation.org>,
 Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
 "Liam R. Howlett" <Liam.Howlett@...cle.com>, Vlastimil Babka
 <vbabka@...e.cz>, Mike Rapoport <rppt@...nel.org>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org,
 linux-riscv@...ts.infradead.org, linux-csky@...r.kernel.org,
 linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.org,
 cgroups@...r.kernel.org, linux-security-module@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org, netdev@...r.kernel.org,
 linux-perf-users@...r.kernel.org, apparmor@...ts.ubuntu.com,
 selinux@...r.kernel.org, linux-alpha@...r.kernel.org,
 linux-snps-arc@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org,
 linux-hexagon@...r.kernel.org, loongarch@...ts.linux.dev,
 linux-m68k@...ts.linux-m68k.org, linux-mips@...r.kernel.org,
 linux-openrisc@...r.kernel.org, linux-parisc@...r.kernel.org,
 linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
 linux-sh@...r.kernel.org, sparclinux@...r.kernel.org,
 linux-um@...ts.infradead.org
Subject: Re: [PATCH v2 3/4] arch: copy_thread: pass clone_flags as u64

On 01.09.25 15:09, Simon Schuster via B4 Relay wrote:
> From: Simon Schuster <schuster.simon@...mens-energy.com>
> 
> With the introduction of clone3 in commit 7f192e3cd316 ("fork: add
> clone3") the effective bit width of clone_flags on all architectures was
> increased from 32-bit to 64-bit, with a new type of u64 for the flags.
> However, for most consumers of clone_flags the interface was not
> changed from the previous type of unsigned long.
> 
> While this works fine as long as none of the new 64-bit flag bits
> (CLONE_CLEAR_SIGHAND and CLONE_INTO_CGROUP) are evaluated, this is still
> undesirable in terms of the principle of least surprise.
> 
> Thus, this commit fixes all relevant interfaces of the copy_thread
> function that is called from copy_process to consistently pass
> clone_flags as u64, so that no truncation to 32-bit integers occurs on
> 32-bit architectures.
> 
> Signed-off-by: Simon Schuster <schuster.simon@...mens-energy.com>
> ---
>   arch/alpha/kernel/process.c      | 2 +-
>   arch/arc/kernel/process.c        | 2 +-
>   arch/arm/kernel/process.c        | 2 +-
>   arch/arm64/kernel/process.c      | 2 +-
>   arch/csky/kernel/process.c       | 2 +-
>   arch/hexagon/kernel/process.c    | 2 +-
>   arch/loongarch/kernel/process.c  | 2 +-
>   arch/m68k/kernel/process.c       | 2 +-
>   arch/microblaze/kernel/process.c | 2 +-
>   arch/mips/kernel/process.c       | 2 +-
>   arch/nios2/kernel/process.c      | 2 +-
>   arch/openrisc/kernel/process.c   | 2 +-
>   arch/parisc/kernel/process.c     | 2 +-
>   arch/powerpc/kernel/process.c    | 2 +-
>   arch/riscv/kernel/process.c      | 2 +-
>   arch/s390/kernel/process.c       | 2 +-
>   arch/sh/kernel/process_32.c      | 2 +-
>   arch/sparc/kernel/process_32.c   | 2 +-
>   arch/sparc/kernel/process_64.c   | 2 +-
>   arch/um/kernel/process.c         | 2 +-
>   arch/x86/include/asm/fpu/sched.h | 2 +-
>   arch/x86/include/asm/shstk.h     | 4 ++--
>   arch/x86/kernel/fpu/core.c       | 2 +-
>   arch/x86/kernel/process.c        | 2 +-
>   arch/x86/kernel/shstk.c          | 2 +-
>   arch/xtensa/kernel/process.c     | 2 +-
>   26 files changed, 27 insertions(+), 27 deletions(-)
> 

(Adjust To: list)

Thanks!

Acked-by: David Hildenbrand <david@...hat.com>

-- 
Cheers

David / dhildenb