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 X-Spam-Level: X-Spam-Status: No, score=-6.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_2 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CC654C433EF for ; Wed, 22 Sep 2021 19:24:51 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 7552E610A1 for ; Wed, 22 Sep 2021 19:24:51 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 7552E610A1 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=goodmis.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=lpVxmrOJNGVTqPLRquoeN1L+sFLV4dq7vOCwfxlA2xg=; b=3neEfMtdxT8S7t yNC4skSakMyotm20fNQnoH/PpGInxznAnPvcNeTMBmL4+YrdazUFsB0siAuX8vya7qXRJ9IGipI2Y YeKm/QSR0rZZzRCxHz4zXgdEDwxnKPl3qFBlDhKcJ5Al4bvfffhaxFsTnQbtVHASxDgZ0aEUfIeAW /pZ/mozKNR//Ik7DjfUh4yj1zxOXdAlL8x2n7v20nbLlyytk7iFLA4lqWB3kYjlspzB0ZRCVCYYYC 1wqcIlgtwxlf6x6fsDqnSlnPPqrrsRf1Lq6/THqwm2kFAtt8PQ/u2B+DTTDuSA0end5UF/PeAzNPY 7CYQ5RQbMK/TQUZFZjLw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mT7pe-009U72-EJ; Wed, 22 Sep 2021 19:23:02 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1mT7pZ-009U5u-No for linux-arm-kernel@lists.infradead.org; Wed, 22 Sep 2021 19:22:59 +0000 Received: from gandalf.local.home (cpe-66-24-58-225.stny.res.rr.com [66.24.58.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 61F6561038; Wed, 22 Sep 2021 19:22:53 +0000 (UTC) Date: Wed, 22 Sep 2021 15:22:50 -0400 From: Steven Rostedt To: David Hildenbrand Cc: Peter Collingbourne , Catalin Marinas , Will Deacon , Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , Thomas Gleixner , Andy Lutomirski , Kees Cook , Andrew Morton , Masahiro Yamada , Sami Tolvanen , YiFei Zhu , Colin Ian King , Mark Rutland , Frederic Weisbecker , Viresh Kumar , Andrey Konovalov , Gabriel Krisman Bertazi , Balbir Singh , Chris Hyser , Daniel Vetter , Chris Wilson , Arnd Bergmann , Dmitry Vyukov , Christian Brauner , "Eric W. Biederman" , Alexey Gladkov , Ran Xiaokai , Xiaofeng Cao , Cyrill Gorcunov , Thomas Cedeno , Marco Elver , Alexander Potapenko , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Evgenii Stepanov Subject: Re: [PATCH] kernel: introduce prctl(PR_LOG_UACCESS) Message-ID: <20210922152250.4e7c869a@gandalf.local.home> In-Reply-To: <29f1822d-e4cd-eedb-bea8-619db1d56335@redhat.com> References: <20210922061809.736124-1-pcc@google.com> <29f1822d-e4cd-eedb-bea8-619db1d56335@redhat.com> X-Mailer: Claws Mail 3.17.8 (GTK+ 2.24.33; x86_64-pc-linux-gnu) MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210922_122257_844577_74816DFC X-CRM114-Status: GOOD ( 16.65 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, 22 Sep 2021 19:46:47 +0200 David Hildenbrand wrote: > > All signals except SIGKILL and SIGSTOP are masked for the interval > > between the prctl() and the next syscall in order to prevent handlers > > for intervening asynchronous signals from issuing syscalls that may > > cause uaccesses from the wrong syscall to be logged. > > Stupid question: can this be exploited from user space to effectively > disable SIGKILL for a long time ... and do we care? I first misread it too, but then caught my mistake reading it a second time. It says "except SIGKILL". So no, it does not disable SIGKILL. -- Steve _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel