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 1D24DC433F5 for ; Fri, 10 Dec 2021 18:26:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S245304AbhLJS3v (ORCPT ); Fri, 10 Dec 2021 13:29:51 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56806 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239276AbhLJS3v (ORCPT ); Fri, 10 Dec 2021 13:29:51 -0500 Received: from mail-pg1-x52e.google.com (mail-pg1-x52e.google.com [IPv6:2607:f8b0:4864:20::52e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 030BAC061746 for ; Fri, 10 Dec 2021 10:26:16 -0800 (PST) Received: by mail-pg1-x52e.google.com with SMTP id l18so4056421pgj.9 for ; Fri, 10 Dec 2021 10:26:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel-dk.20210112.gappssmtp.com; s=20210112; h=from:to:cc:in-reply-to:references:subject:message-id:date :mime-version:content-transfer-encoding; bh=5ZWHsHrPXRi2wsn383Uu/1pd+rYDunvKkawYraa0NUU=; b=z0fHip/MZwxDe4vHYomeTzwFJb3U1F6jmwmgr3rsirUf0tChAE9PzrAEZsHbsKImCf xS6IWdNUa3EYz58mawdCaReNw+O8oHfgl9j2dl29xc3YGvOtK99laelFIU5V9aoAVDhE meb/xRVCcR+yg9zzngV5tDxT2SbF1K+GThAZNbbtCkoY61bZN+rChuSGCAPN5BwME6Jm 4WroOOpahZaNSNUxLyRsCFD/sOE+9GdNsXOc8mpZ0N+uoP+NELn+gQjbL45l7EVOQZfx YSZ6oHZW49PgergROwi7NGAYk8kNMMqaBiW4jKiDwnVQqrdPWjCG5Vj+XjZ6IJSIKEaN d07w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:in-reply-to:references:subject :message-id:date:mime-version:content-transfer-encoding; bh=5ZWHsHrPXRi2wsn383Uu/1pd+rYDunvKkawYraa0NUU=; b=qADW0d7F1Tri/SGl5VvjtkqmDBpcxQNp3S93giOPh5X8C+c2YsNlJN/wGZ3VptNIHm lfh47CmzDtdKF67e/+oWTe5VOz5Arhhy1FYQXDsqyVQ1MQsyAflHGFSutIZ/SgLaDDk5 GGTOu1dKsxETN4d7ahNrj8Un1ZTudzOlh6WXz7/+gVamq+mXXNp/DI1czaQUx23g8Ypb YPnQ3XQ3As1v7DmdwbIc7eocoV0A07IERpSQ7d/TDQmWiRbzyy/jD4Yt/t54/bHcIzxr QXVf4ItgSlBXKekGiSUCpgP7xUd+2HwWavKvX0yOKVjL6sfiiknEf9xW79QRi9mD4ej7 JPdQ== X-Gm-Message-State: AOAM530m8I3esgDjNU9yB6QlC61C1dnT3d2WCmaSefwWF9q01E+fIjug /62/rZU5wWsBJLyakELoG5XCOA== X-Google-Smtp-Source: ABdhPJwSJasp5TOKzYWPb4Na+8MBZ6lVt9UPw0kNn5DPvNdYwiUA3S0wvCDRN19sohb737MFHivkIA== X-Received: by 2002:a62:c541:0:b0:4ad:561a:5b6c with SMTP id j62-20020a62c541000000b004ad561a5b6cmr19546309pfg.48.1639160775461; Fri, 10 Dec 2021 10:26:15 -0800 (PST) Received: from [172.20.4.26] ([66.185.175.30]) by smtp.gmail.com with ESMTPSA id mz7sm13410388pjb.7.2021.12.10.10.26.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 10 Dec 2021 10:26:15 -0800 (PST) From: Jens Axboe To: Davidlohr Bueso Cc: linux-kernel@vger.kernel.org, Davidlohr Bueso , oleg@redhat.com, linux-block@vger.kernel.org In-Reply-To: <20211210182058.43417-1-dave@stgolabs.net> References: <20211210182058.43417-1-dave@stgolabs.net> Subject: Re: [PATCH] block: fix ioprio_get(IOPRIO_WHO_PGRP) vs setuid(2) Message-Id: <163916077449.627295.16747606305851596098.b4-ty@kernel.dk> Date: Fri, 10 Dec 2021 11:26:14 -0700 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org On Fri, 10 Dec 2021 10:20:58 -0800, Davidlohr Bueso wrote: > do_each_pid_thread(PIDTYPE_PGID) can race with a concurrent > change_pid(PIDTYPE_PGID) that can move the task from one hlist > to another while iterating. Serialize ioprio_get to take > the tasklist_lock in this case, just like it's set counterpart. > > Applied, thanks! [1/1] block: fix ioprio_get(IOPRIO_WHO_PGRP) vs setuid(2) commit: e6a59aac8a8713f335a37d762db0dbe80e7f6d38 Best regards, -- Jens Axboe