linux-kernel - [PATCH v2 0/2] Convert copy_from_user() + kstrtouint() to kstrtouint_from

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Message-Id: <20260117145615.53455-1-fushuai.wang@linux.dev>
Date: Sat, 17 Jan 2026 22:56:13 +0800
From: Fushuai Wang <fushuai.wang@...ux.dev>
To: mingo@...hat.com,
	peterz@...radead.org,
	juri.lelli@...hat.com,
	vincent.guittot@...aro.org,
	dietmar.eggemann@....com,
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Cc: linux-kernel@...r.kernel.org,
	x86@...nel.org,
	wangfushuai@...du.com,
	aliceryhl@...gle.com,
	ynorov@...dia.com
Subject: [PATCH v2 0/2] Convert copy_from_user() + kstrtouint() to kstrtouint_from_user()

From: Fushuai Wang <wangfushuai@...du.com>

Hi,

There are several places use copy_from_user() to copy a string from
userspase, followed by kstrtoXXX() to convert it to a desired type.
This approach requires manually handling NUL-termination and proper
buffer sizing, which is error-prone and unnecessarily complex. The
kernel provides kstrtoXXX_from_user() helpers to copy a string from
userspace and perform the conversion in one step. So use a
kstrtoXXX_from_user() instead of copy_from_user() + kstrtoXXX().

Recent discussion:
https://lore.kernel.org/all/20260112073039.1185-1-fushuai.wang@linux.dev/T/

v1:
https://lore.kernel.org/all/20260116131751.45768-1-fushuai.wang@linux.dev/T/#t

Fushuai Wang (2):
  sched/debug: Convert copy_from_user() + kstrtouint() to
    kstrtouint_from_user()
  x86/tlb: Convert copy_from_user() + kstrtouint() to
    kstrtouint_from_user()

 arch/x86/mm/tlb.c    | 13 ++++---------
 kernel/sched/debug.c | 14 ++++----------
 2 files changed, 8 insertions(+), 19 deletions(-)

-- 
2.36.1