From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-188.mta0.migadu.com (out-188.mta0.migadu.com [91.218.175.188]) (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 53A1D331226 for ; Mon, 12 Jan 2026 07:32:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.188 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768203128; cv=none; b=q+EXtit/GF+lAylDfWABQJ9R4Pv8C6/qHiDicFed8NYo3XoUPTzNIvulkkK7mUVAsz6FobQwHAh+FmIiZjxBYs93vOGXbKmcBO96Qy6Jafc3p0y6KnoNogZLtb0X4ghTICZj5AiBUl2pjJR0E2tIy/z6fE4WmusQBPsp4wL71uo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768203128; c=relaxed/simple; bh=eHRTYFWu9aM7ya+jZzDKgChWnn9WNk9AfvsQ4P4sh00=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=e8vGUO1+pjJY8JMqKr3VYD5KsmtAWlmdThrxF80BbZ1rfjsIi2gevafSXb/ger5IVJASW6EhWu9lNSOmC/rylGbOkt/lnbsVrs1R+53bXHMzLvm0L1HeNqq37ga7plnvl2hwAbRLV9UWoSWc+S2nriPhgnTs5UdCRyWazwMCJSs= 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=u50Wkj6l; arc=none smtp.client-ip=91.218.175.188 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="u50Wkj6l" 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=1768203121; 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=dmoiTseSNktfLj4CfwRlR/i2JM/XKf2Hh9f07dEccSc=; b=u50Wkj6lO5c1Lvizbeft3JcTB6QajgqhaTsRTW6t+3Xe5wyfj1zQ2LdgwjXdoYmP7fd5kf 0cPRfbHuEP+l5Cc+ttVmqCmWOkp4+x+oS/GadCVbfxvzlEZUHXKk9EXJlCE96cTlqPTTId meqRDVkC+tlgZby4pgZXur9o36hyepc= 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 3/6] tracing: Use copy_from_user_nul() instead of copy_from_user() Date: Mon, 12 Jan 2026 15:30:36 +0800 Message-Id: <20260112073039.1185-4-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 --- kernel/trace/trace.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index baec63134ab6..b6ffd006fcf9 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -11266,10 +11266,9 @@ ssize_t trace_parse_run_command(struct file *file, const char __user *buffer, if (size >= WRITE_BUFSIZE) size = WRITE_BUFSIZE - 1; - if (copy_from_user(kbuf, buffer + done, size)) + if (copy_from_user_nul(kbuf, buffer + done, size)) return -EFAULT; - kbuf[size] = '\0'; buf = kbuf; do { tmp = strchr(buf, '\n'); -- 2.36.1