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=-9.2 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham 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 0F9E2C2BB9A for ; Tue, 15 Dec 2020 17:02:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CBC5022581 for ; Tue, 15 Dec 2020 17:02:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725901AbgLORCP (ORCPT ); Tue, 15 Dec 2020 12:02:15 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37756 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728853AbgLORCJ (ORCPT ); Tue, 15 Dec 2020 12:02:09 -0500 Received: from mail-wr1-x42a.google.com (mail-wr1-x42a.google.com [IPv6:2a00:1450:4864:20::42a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 851CAC06179C; Tue, 15 Dec 2020 09:01:28 -0800 (PST) Received: by mail-wr1-x42a.google.com with SMTP id w5so16844424wrm.11; Tue, 15 Dec 2020 09:01:28 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=to:cc:from:subject:message-id:date:user-agent:mime-version :content-language:content-transfer-encoding; bh=6+fxsHFgSx+IM6xhU+y8t26uFC5ICSSzXCYby0B3h5U=; b=DANblccvTpgbuSB+n3503apV1OSElbtkF7PmQZbw4z/geCtzhjkYIgjVR9SDwpbXi6 oj/QzPEkW7bTs5vHkUXxJZNBoIkhf2HvYndEAg9fBIm+YGxTyPCJh8PzQPEcdSlKEoK1 jqPZUzvvP74R8smUSSrfjNsCaDxvU+AUM0rgQmr8VdjSqBJRzCllfaWEMo83UjBWe3N+ +QwLuzZPddXGj1++7JLQtbI6v0PcvdmwMiDwGY4T6m1car366LswPy1wSpNkZkNLA4FJ LQlpeN+siQuJ2Aqh7gb7pEavX5Yq+juf/HkK3iuU8kqApwoJIVMmAxDbCO1jRCmsboTM jCQQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:to:cc:from:subject:message-id:date:user-agent :mime-version:content-language:content-transfer-encoding; bh=6+fxsHFgSx+IM6xhU+y8t26uFC5ICSSzXCYby0B3h5U=; b=Z8cq95rMb33zVZafjwd7awOhHNav1ZiR3a1/wh7G4EhlbDTZZ05rll5CWWblNAGWnH tAO07oXE+sFkeyJJ+q24QVVJR1CnqcnWI+sqKL/qY+fU9em0GJV+zH+sABHs+7u+VmtP RnZSXza8gsc+VkEmbPv9ssImEpoKDSJQfs9yNPKiIIvmFKJdqCbRTjJLIngfSOaGUz8i MZYlljHPNaObkPOCASx3CwekuBgaGnC/oNkU3ezjPcVgpWmxnVpU6MekPTqXhqMkx4xp I6ovM9KOS5FIpYFl1B1teo8uJ7f+PamDzMM8Sjjdq97M1t23tAdSuvgNrTYPK9PMJvvr +rXg== X-Gm-Message-State: AOAM531xt95ejDYF1zZK5vvtX7hmw5E+VCeF6Mh4WaYom4kuwBBObGiO YFUhF/GFQUuqFglQjOox8f/Irng5F8Y= X-Google-Smtp-Source: ABdhPJwSCMAC6PbaCbodENPxp4L/4NBjf80I92gDUGteecddCx45uZ8gkxeGP+ojRCjoYZ2gK4FL7A== X-Received: by 2002:adf:9e4c:: with SMTP id v12mr3620110wre.22.1608051687263; Tue, 15 Dec 2020 09:01:27 -0800 (PST) Received: from [192.168.1.143] ([170.253.51.130]) by smtp.gmail.com with ESMTPSA id z2sm38489203wml.23.2020.12.15.09.01.26 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 15 Dec 2020 09:01:26 -0800 (PST) To: Pavel Emelyanov , Oleg Nesterov , Andrew Morton , Michael Kerrisk , Kees Cook , Jann Horn Cc: Ted Estes , linux-man , linux-kernel From: "Alejandro Colomar (man-pages)" Subject: [Bug 210655] ptrace.2: documentation is incorrect about access checking threads in same thread group Message-ID: Date: Tue, 15 Dec 2020 18:01:25 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.5.1 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-man@vger.kernel.org Hi, There's a bug report: https://bugzilla.kernel.org/show_bug.cgi?id=210655 [[ Under "Ptrace access mode checking", the documentation states: "1. If the calling thread and the target thread are in the same thread group, access is always allowed." This is incorrect. A thread may never attach to another in the same group. Reference, ptrace_attach() https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/kernel/ptrace.c?h=v5.9.14#n380 ]] I just wanted to make sure that it is a bug in the manual page, and not in the implementation. Thanks, Alex -- Alejandro Colomar Linux man-pages comaintainer; https://www.kernel.org/doc/man-pages/ http://www.alejandro-colomar.es