From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-174.mta0.migadu.com (out-174.mta0.migadu.com [91.218.175.174]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7C2DC288D6 for ; Sat, 17 Jan 2026 14:57:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.174 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768661822; cv=none; b=ZuqQW42xv0bc8qyrg8foezkAmrcHzE+IOD3JMnpRUDiqIcEuVPnNTO66VHeSWKXEfxbRhLk0FuM61n5lI+DQmX1iwtwf/RwdtXfZH1Q14btPGwYT5g6l98/zwyJvFUhHGoyIR3GpCtTK01ZOpYMNjeRDXQDr2kflLMlPIZ6Nuqw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768661822; c=relaxed/simple; bh=o3ULsswk6mre9YDS+U6FA/nQMQmkLf3OUTqANnLqj1w=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=dFT5mvTOzAG8ymhUdjxeaQ14mPoyV/XytliXyvzWrhEHXHMA3uKgzvHh2lK5kA0pjPHOKbCTbARtm0t3HeGBaLOay8+PQd7xaM2OqG3y1UstvRRLXHn64Ca/4ktj2f4huqcMfAFKG2//UeQfqJ8jRMwOFZJCVtGcHYC+hUv/b/M= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=ubYfAHdK; arc=none smtp.client-ip=91.218.175.174 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="ubYfAHdK" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1768661817; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=qJ/sKhk7WQ23agyq42Er7liS5D9vhMWcHVAn60QKtbU=; b=ubYfAHdK2TRZ/lrtHIdCGqcuALNUUMkDVKKD0yJqCpP2PhhjpQketSRSnDdKLfTCzGy8Qc QogIA+TTCqg7US9fNTCFnEOIhPOoxOPIxL2w4CSm/VSYvDKS7SJHPX5EEa0c8wGO/uXj/c FEDA+O4gM+NZnpAPjDt8e/QYr9sTsfc= From: Fushuai Wang To: mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, vschneid@redhat.com, dave.hansen@linux.intel.com, luto@kernel.org, tglx@kernel.org, bp@alien8.de, hpa@zytor.com Cc: linux-kernel@vger.kernel.org, x86@kernel.org, wangfushuai@baidu.com, aliceryhl@google.com, ynorov@nvidia.com Subject: [PATCH v2 0/2] Convert copy_from_user() + kstrtouint() to kstrtouint_from_user() Date: Sat, 17 Jan 2026 22:56:13 +0800 Message-Id: <20260117145615.53455-1-fushuai.wang@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT From: Fushuai Wang 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