From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-183.mta0.migadu.com (out-183.mta0.migadu.com [91.218.175.183]) (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 8372E329C78 for ; Mon, 12 Jan 2026 07:31:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.183 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768203120; cv=none; b=jFjiXv4saXxY2G/O09OKqpCmG8GxGsLaoixAfRhj//fpNMt35zidBipRW6PZnfcLvUh4UyqkFUgAVLvn59eFCzF/0NPpV+XpmagWARpmyUb9fPZGznEhxalJhDV0HKsKwtQoBBcSngH4hgWbkm/YEddkV9v69a40myyivPsZrB8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768203120; c=relaxed/simple; bh=dalNA0BxdWJLQHtJZnm34WkI5gbCzurqkKSSozGr3Z8=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=snSxw/DgPvw/ae4cO83mHYHlcCWkHLlI1i/ugr7QZkpiRCrWnMq1+y/BJdeZu3TZ73h+OttYp8NvHXHMpxd+6/vFmlbKD8YZzc01nbIlPBowEVfOpAqEslJR1wvl+UO6uGlXks8pmKUaqIpHUAuyFivtl62K/qB03lnB5TLG8KQ= 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=jE7S1QL7; arc=none smtp.client-ip=91.218.175.183 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="jE7S1QL7" 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=1768203114; 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: in-reply-to:in-reply-to:references:references; bh=RW/CePLfpA2cGIbxlZCaBzT9qs/BsPWVBCiDlhNUjWo=; b=jE7S1QL7faF8pM+PQ3qz7/gONZwLuf22VH7YNNseR6jXXdqtKxNBogGlV4nqM3wPpeSAPD eQwJGXWmgaXqtAgLzd06r41dY4j74XFyLyzr0lj6KlKa9d/+tQ6YWI2mKCpf2ihDi4SRQp tz6xHlGi1cjtwYfx4OvbNHsV7sXfWDQ= From: Fushuai Wang To: tglx@kernel.org, peterz@infradead.org, mathieu.desnoyers@efficios.com, akpm@linux-foundation.org, aliceryhl@google.com, yury.norov@gmail.com, vmalik@redhat.com, kees@kernel.org, dave.hansen@linux.intel.com, luto@kernel.org, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, rostedt@goodmis.org, mhiramat@kernel.org, brauner@kernel.org, jack@suse.cz, cyphar@cyphar.com Cc: linux-kernel@vger.kernel.org, x86@kernel.org, linux-trace-kernel@vger.kernel.org, wangfushuai@baidu.com Subject: [PATCH v2 2/6] x86/tlb: Use copy_from_user_nul() instead of copy_from_user() Date: Mon, 12 Jan 2026 15:30:35 +0800 Message-Id: <20260112073039.1185-3-fushuai.wang@linux.dev> In-Reply-To: <20260112073039.1185-1-fushuai.wang@linux.dev> References: <20260112073039.1185-1-fushuai.wang@linux.dev> Precedence: bulk X-Mailing-List: linux-trace-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 Use copy_from_user_nul() instead of copy_from_user() to simplify the code. No functional change. Signed-off-by: Fushuai Wang --- arch/x86/mm/tlb.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c index f5b93e01e347..ae81e5cb510e 100644 --- a/arch/x86/mm/tlb.c +++ b/arch/x86/mm/tlb.c @@ -1807,10 +1807,9 @@ static ssize_t tlbflush_write_file(struct file *file, int ceiling; len = min(count, sizeof(buf) - 1); - if (copy_from_user(buf, user_buf, len)) + if (copy_from_user_nul(buf, user_buf, len)) return -EFAULT; - buf[len] = '\0'; if (kstrtoint(buf, 0, &ceiling)) return -EINVAL; -- 2.36.1