From patchwork Thu Mar 28 14:04:52 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arnd Bergmann X-Patchwork-Id: 13608616 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 30E34129E81; Thu, 28 Mar 2024 14:06:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711634815; cv=none; b=n9uQjWh+xVopXwWZTLfgiKbBy2OgeDbbqkYLMHF4HWdKtpk5o9E6Mpua/mWZnFUkZ6Tlhp49PeAQCnJ9YdQRbbv8pVcaWk2S6RtmPZfoH8lv07TSZTrpjW3PHf7VWsvSKef7dNWltZ+pNmE29vDcqGwf/5hpnnshH5J0o7dD2p4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711634815; c=relaxed/simple; bh=4Sl2+ylJNPrkTlbZJE1y57+3AaBXLpboKEKujg0bFD0=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=R8WuLBFMcPJLl6cA4d4KEJJObFirVt7s+YkCpcagp+UqoIijukZQED0AOLENZMDjWjKRuePSNCS7LVR0cwrlBzxKR+RpkaryYcr3aIDsD5Q/3T00pPIgCOtJak4X+0PkpXvgFvyrffzzqPMjuaItXw//X7C7/SecbAPGggJlrzI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=FYCMzsrE; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="FYCMzsrE" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DDC22C433C7; Thu, 28 Mar 2024 14:06:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1711634814; bh=4Sl2+ylJNPrkTlbZJE1y57+3AaBXLpboKEKujg0bFD0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FYCMzsrEVcyxP1XJhQaxTBt5DaBA2wyIYnrE2OsH3WaOj1FvDey9aFrzZt+gSz7k7 z0SUHERlLXNrgM/t0uMzYS8iMEXh9K3FJA+WUPlNG9AuANTMdfHy7G6ObmmlUaEncx g5bFeK3k200QYAg0ehIgZXN1WAcFtAhXEloKn6p8DPumCHxhJzLvdIeOx2pWWjgskr 84m6zeMItrJBAOtuwQRr01nSH6aH8kXra7LQKqhEw53WiqsGNKfIpqx8sQAYUlWPg7 hGDg++GOtZH7XAAAB08NWysoOetgdxL4fJcnq2yDXY6RGd2Pg0B9O+5Tk32VsvtUQD PD90IojI+UJ0Q== From: Arnd Bergmann To: linux-kernel@vger.kernel.org, Jens Axboe , Steven Rostedt , Masami Hiramatsu Cc: Arnd Bergmann , Mathieu Desnoyers , linux-block@vger.kernel.org, linux-trace-kernel@vger.kernel.org Subject: [PATCH 08/11] blktrace: convert strncpy() to strscpy_pad() Date: Thu, 28 Mar 2024 15:04:52 +0100 Message-Id: <20240328140512.4148825-9-arnd@kernel.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240328140512.4148825-1-arnd@kernel.org> References: <20240328140512.4148825-1-arnd@kernel.org> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Arnd Bergmann gcc-9 warns about a possibly non-terminated string copy: kernel/trace/blktrace.c: In function 'do_blk_trace_setup': kernel/trace/blktrace.c:527:2: error: 'strncpy' specified bound 32 equals destination size [-Werror=stringop-truncation] Newer versions are fine here because they see the following explicit nul-termination. Using strscpy_pad() avoids the warning and simplifies the code a little. The padding helps give a clean buffer to userspace. Signed-off-by: Arnd Bergmann --- kernel/trace/blktrace.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c index d5d94510afd3..95a00160d465 100644 --- a/kernel/trace/blktrace.c +++ b/kernel/trace/blktrace.c @@ -524,8 +524,7 @@ static int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev, if (!buts->buf_size || !buts->buf_nr) return -EINVAL; - strncpy(buts->name, name, BLKTRACE_BDEV_SIZE); - buts->name[BLKTRACE_BDEV_SIZE - 1] = '\0'; + strscpy(buts->name, name, BLKTRACE_BDEV_SIZE); /* * some device names have larger paths - convert the slashes