From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3E82BC433EF for ; Thu, 18 Nov 2021 12:46:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 179CE61ABD for ; Thu, 18 Nov 2021 12:46:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344796AbhKRMti (ORCPT ); Thu, 18 Nov 2021 07:49:38 -0500 Received: from out30-42.freemail.mail.aliyun.com ([115.124.30.42]:40560 "EHLO out30-42.freemail.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344779AbhKRMtc (ORCPT ); Thu, 18 Nov 2021 07:49:32 -0500 X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R611e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e04395;MF=xhao@linux.alibaba.com;NM=1;PH=DS;RN=5;SR=0;TI=SMTPD_---0UxCJM88_1637239590; Received: from localhost.localdomain(mailfrom:xhao@linux.alibaba.com fp:SMTPD_---0UxCJM88_1637239590) by smtp.aliyun-inc.com(127.0.0.1); Thu, 18 Nov 2021 20:46:30 +0800 From: Xin Hao To: sj@kernel.org Cc: xhao@linux.alibaba.com, akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH V2] mm/damon/schemes: Add the validity judgment of thresholds Date: Thu, 18 Nov 2021 20:46:24 +0800 Message-Id: X-Mailer: git-send-email 2.31.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org In dbgfs "schemes" interface, i do some test like this: # cd /sys/kernel/debug/damon # echo "2 1 2 1 10 1 3 10 1 1 1 1 1 1 1 1 2 3" > schemes # cat schemes # 2 1 2 1 10 1 3 10 1 1 1 1 1 1 1 1 2 3 0 0 There have some unreasonable places, i set the valules of these variables " , , " as "<2, 1>, <2, 1>, <10, 1>, <1, 2, 3>. So there add a validity judgment for these thresholds value. Signed-off-by: Xin Hao --- mm/damon/dbgfs.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/mm/damon/dbgfs.c b/mm/damon/dbgfs.c index befb27a29aab..4a96cd4df24f 100644 --- a/mm/damon/dbgfs.c +++ b/mm/damon/dbgfs.c @@ -215,6 +215,13 @@ static struct damos **str_to_schemes(const char *str, ssize_t len, goto fail; } + if (min_sz > max_sz || min_nr_a > max_nr_a || min_age > max_age) + goto fail; + + if (wmarks.high < wmarks.mid || wmarks.high < wmarks.low || + wmarks.mid < wmarks.low) + goto fail; + pos += parsed; scheme = damon_new_scheme(min_sz, max_sz, min_nr_a, max_nr_a, min_age, max_age, action, "a, &wmarks); -- 2.31.0