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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 46FC4C433FE for ; Sat, 8 Oct 2022 03:06:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229564AbiJHDF7 (ORCPT ); Fri, 7 Oct 2022 23:05:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33822 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229510AbiJHDF5 (ORCPT ); Fri, 7 Oct 2022 23:05:57 -0400 Received: from szxga01-in.huawei.com (szxga01-in.huawei.com [45.249.212.187]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CEEAF7D7B7 for ; Fri, 7 Oct 2022 20:05:50 -0700 (PDT) Received: from dggpeml500020.china.huawei.com (unknown [172.30.72.55]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4Mkqgz6gvTzlXh8; Sat, 8 Oct 2022 11:01:19 +0800 (CST) Received: from dggpeml500016.china.huawei.com (7.185.36.70) by dggpeml500020.china.huawei.com (7.185.36.88) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Sat, 8 Oct 2022 11:05:49 +0800 Received: from [10.174.176.102] (10.174.176.102) by dggpeml500016.china.huawei.com (7.185.36.70) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Sat, 8 Oct 2022 11:05:48 +0800 Message-ID: <01783b8c-2a39-73ec-c537-cc1df82643e2@huawei.com> Date: Sat, 8 Oct 2022 11:05:48 +0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.3.2 To: Theodore Ts'o CC: , Lukas Czerner , , linfeilong From: zhanchengbin Subject: [PATCH] misc/fsck.c: Processes may kill other processes. Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-Originating-IP: [10.174.176.102] X-ClientProxiedBy: dggpeml500017.china.huawei.com (7.185.36.243) To dggpeml500016.china.huawei.com (7.185.36.70) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-ext4@vger.kernel.org If run the fsck -N command, processes don't execute, just show what would be done. However, the pid whose value is -1 is added to the instance_list list in the execute function,if the kill_all function is called later, kill(-1, signum) is executed, Signals are sent to all processes except the number one process and itself. Other processes will be killed if they use the default signal processing function. Signed-off-by: zhanchengbin --- misc/fsck.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/misc/fsck.c b/misc/fsck.c index 4efe10ec..faf7789d 100644 --- a/misc/fsck.c +++ b/misc/fsck.c @@ -546,6 +546,8 @@ static int kill_all(int signum) for (inst = instance_list; inst; inst = inst->next) { if (inst->flags & FLAG_DONE) continue; + if (inst->pid == -1) + continue; kill(inst->pid, signum); n++; } -- 2.27.0