From patchwork Mon Oct 7 13:51:26 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Leo Yan X-Patchwork-Id: 13824715 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 87D1B17B4E9; Mon, 7 Oct 2024 13:51:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728309099; cv=none; b=qDo87AACu9JqZ+m24EPK25I65CUQ8g1hGSuTOV6xnK+7VRNmynvIFTSRyQ0yKFCpQGMLciTYh+uJXiyRwcsaHAgabY00DCV5kEnf9Y0NeabAc89kvvD7NpsmPfSVcbyrPGOKVUx6TDuLlbUXB6tXbGEbT8O3pL+KegQmX7M7ZP4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728309099; c=relaxed/simple; bh=YW1TLeRgf3X5WEfXbhRqUOfyZiKkWMAtBU8XW+ig4+A=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=Imjpc1z9Le/JA5UQ4SOKd+PMp9fnQp5cNEvYiQvB9riDlps2gJjQ3GnS4iYtZtFVxCph9m5kwCsqjV5z7lp5VmWJolF+NeoOWOSJo2iXBAsnBd9PQh2olOJbN6f4blBAl3Rl2uq1kwFAsr7xZ6b1KC/5m2JaErfV/9bwr3i2US0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 7358DFEC; Mon, 7 Oct 2024 06:52:06 -0700 (PDT) Received: from e132581.cambridge.arm.com (e132581.arm.com [10.2.76.71]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id E16103F64C; Mon, 7 Oct 2024 06:51:35 -0700 (PDT) From: Leo Yan To: Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Dave.Martin@arm.com, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Cc: Leo Yan Subject: [PATCH] tracing: Consider the NULL character when validating the event length Date: Mon, 7 Oct 2024 14:51:26 +0100 Message-Id: <20241007135126.873234-1-leo.yan@arm.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 strlen() returns a string length excluding the null byte. This commit adds 1 to account for the NULL terminating character when checking if an event string is within the maximum length. Fixes: dec65d79fd26 ("tracing/probe: Check event name length correctly") Signed-off-by: Leo Yan --- kernel/trace/trace_probe.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c index 39877c80d6cb..376ba56c3680 100644 --- a/kernel/trace/trace_probe.c +++ b/kernel/trace/trace_probe.c @@ -276,7 +276,7 @@ int traceprobe_parse_event_name(const char **pevent, const char **pgroup, } trace_probe_log_err(offset, NO_EVENT_NAME); return -EINVAL; - } else if (len > MAX_EVENT_NAME_LEN) { + } else if (len + 1 > MAX_EVENT_NAME_LEN) { trace_probe_log_err(offset, EVENT_TOO_LONG); return -EINVAL; }