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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 773D1C43334 for ; Fri, 10 Jun 2022 18:04:49 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id D97D78D00D3; Fri, 10 Jun 2022 14:04:48 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id D468F8D00CB; Fri, 10 Jun 2022 14:04:48 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id C0F7E8D00D3; Fri, 10 Jun 2022 14:04:48 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id B1F658D00CB for ; Fri, 10 Jun 2022 14:04:48 -0400 (EDT) Received: from smtpin15.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay09.hostedemail.com (Postfix) with ESMTP id 9162C34153 for ; Fri, 10 Jun 2022 18:04:48 +0000 (UTC) X-FDA: 79563101856.15.164BF5D Received: from mga04.intel.com (mga04.intel.com [192.55.52.120]) by imf31.hostedemail.com (Postfix) with ESMTP id 8EC4B2008E for ; Fri, 10 Jun 2022 18:04:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1654884287; x=1686420287; h=date:from:to:cc:subject:message-id:references: mime-version:in-reply-to; bh=8eNvZWqD4YWYW659R4S17U2jKOE9xtXav0016+fJ7Ug=; b=TDHQhTTUTuI8b8JJcCTzCXb8uZ776i4FlNq8qGV5WTtJoGZ0KNo7tq/q PvZUf21usxS+adgsXO4qTlGRI9hWDSxzj7HFF/PbeOWaP3rAsx5plYRNs F4vf9w1yNUbaSSoyRASWmr1aHQFQx7h8eoc96pITuJe6XC5thYwJby20y js0lHJzf6eWayXAuxolJCaSpUAbB1vbhWEhdPXNf5pnKKm7fnb4A7B+ip 0jprowR7+FR0v/16jdlLHCIfDZCE7bd19j7G+/KJzuvWyMYqIH/WCmpu/ s8X5Qk4oYiB9AwiWDnwD9Z1n69i517eWwOPY3A5m3r4MuXS+i3l0f/aWh Q==; X-IronPort-AV: E=McAfee;i="6400,9594,10374"; a="276481387" X-IronPort-AV: E=Sophos;i="5.91,291,1647327600"; d="scan'208";a="276481387" Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Jun 2022 11:04:46 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.91,291,1647327600"; d="scan'208";a="760612018" Received: from black.fi.intel.com ([10.237.72.28]) by orsmga005.jf.intel.com with ESMTP; 10 Jun 2022 11:04:42 -0700 Received: by black.fi.intel.com (Postfix, from userid 1000) id E1A0AF8; Fri, 10 Jun 2022 21:04:45 +0300 (EEST) Date: Fri, 10 Jun 2022 21:04:45 +0300 From: "Kirill A. Shutemov" To: "Edgecombe, Rick P" Cc: "peterz@infradead.org" , "Lutomirski, Andy" , "dave.hansen@linux.intel.com" , "linux-kernel@vger.kernel.org" , "hjl.tools@gmail.com" , "linux-mm@kvack.org" , "kcc@google.com" , "andreyknvl@gmail.com" , "ak@linux.intel.com" , "dvyukov@google.com" , "x86@kernel.org" , "ryabinin.a.a@gmail.com" , "glider@google.com" Subject: Re: [PATCHv3 6/8] x86/mm: Provide ARCH_GET_UNTAG_MASK and ARCH_ENABLE_TAGGED_ADDR Message-ID: <20220610180445.fmzgrobscwrblxud@black.fi.intel.com> References: <20220610143527.22974-1-kirill.shutemov@linux.intel.com> <20220610143527.22974-7-kirill.shutemov@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1654884288; a=rsa-sha256; cv=none; b=eP7s0uljHOYgXc/RDXkGKc+VZ1CRCFCxrtB8oYLHTgrnmHFKEG8zexiE+YQ6Cw9lavLbfu v7/BCUMUNwZ+UkzUAxNN9d3uSBNsdyZFeDNN5fWnzGo+oQVYI8IW3eJmbjm9uTQ8qzS/Qu SdsEmJnMXbQEdKm1gPvm0yAiF6IkPX8= ARC-Authentication-Results: i=1; imf31.hostedemail.com; dkim=pass header.d=intel.com header.s=Intel header.b=TDHQhTTU; dmarc=pass (policy=none) header.from=intel.com; spf=none (imf31.hostedemail.com: domain of kirill.shutemov@linux.intel.com has no SPF policy when checking 192.55.52.120) smtp.mailfrom=kirill.shutemov@linux.intel.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1654884288; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=pV2QIvYPisLHzxZz1cEmyi+tddDGK+9+wVm+aYzJomE=; b=uBPofo/quPeVAGmNnuFZrhSUgsK6AUXTwcutTXuf9R32xkMmQbtY3pX0olk/5hPHz8GPOp E5f9MIWrKyXiWzWdOK73bSn04VnScXhF1pQh0F3Q8erVsjwRJTF23Ksy0VhcPYuRr1P+KN GyeiimFPdCAjplWBuuEIheiojIF75fA= X-Stat-Signature: 6nx9reiy59mquxofsqinbc96spj7da9q X-Rspamd-Queue-Id: 8EC4B2008E X-Rspam-User: X-Rspamd-Server: rspam10 Authentication-Results: imf31.hostedemail.com; dkim=pass header.d=intel.com header.s=Intel header.b=TDHQhTTU; dmarc=pass (policy=none) header.from=intel.com; spf=none (imf31.hostedemail.com: domain of kirill.shutemov@linux.intel.com has no SPF policy when checking 192.55.52.120) smtp.mailfrom=kirill.shutemov@linux.intel.com X-HE-Tag: 1654884287-602890 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, Jun 10, 2022 at 03:25:02PM +0000, Edgecombe, Rick P wrote: > On Fri, 2022-06-10 at 17:35 +0300, Kirill A. Shutemov wrote: > > +static int prctl_enable_tagged_addr(unsigned long nr_bits) > > +{ > > + struct mm_struct *mm = current->mm; > > do_arch_prctl_64() can be called via ptrace. I think you need to > operate on the mm of 'task', or just block the operation if task != > current. Hm. True. Let's see if the interface in general good enough. Ouch. I just noticied that I missed check for LAM feature :/ -- Kirill A. Shutemov