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=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS 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 9D86CC433B4 for ; Tue, 18 May 2021 18:04:32 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 0020C611CE for ; Tue, 18 May 2021 18:04:31 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0020C611CE Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=alien8.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 3A80D6B0151; Tue, 18 May 2021 14:04:31 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 330B06B0153; Tue, 18 May 2021 14:04:31 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 185376B0154; Tue, 18 May 2021 14:04:31 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0188.hostedemail.com [216.40.44.188]) by kanga.kvack.org (Postfix) with ESMTP id D3C2D6B0151 for ; Tue, 18 May 2021 14:04:30 -0400 (EDT) Received: from smtpin18.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 6216B180AD83E for ; Tue, 18 May 2021 18:04:30 +0000 (UTC) X-FDA: 78155126700.18.D591DBF Received: from mail.skyhub.de (mail.skyhub.de [5.9.137.197]) by imf13.hostedemail.com (Postfix) with ESMTP id E6880E00010A for ; Tue, 18 May 2021 18:04:24 +0000 (UTC) Received: from zn.tnic (p200300ec2f0ae2009fe1e516c71afc1c.dip0.t-ipconnect.de [IPv6:2003:ec:2f0a:e200:9fe1:e516:c71a:fc1c]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.skyhub.de (SuperMail on ZX Spectrum 128k) with ESMTPSA id 95C221EC01FC; Tue, 18 May 2021 19:58:43 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim; t=1621360723; h=from:from: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; bh=lYrYc/sDhQ8UivR+VcXmOLyHqj3bMiuASqw7cjE5B8M=; b=kE3yncmQkEk2XHVbvQL9S4NC32KK+jj+Fl0PYMMYE8G0kYExZoHA05jH4Ec1u4xQh42DVJ /PDQrNJrUjwflMJLWeG8oDZx1rrAv+9NAVmH0fphIxf1YyMY6xnNMzCdKt5kgt3lxj5pzh EOgqO07ZZOj8oFfimX/wdixvqNsyjf0= Date: Tue, 18 May 2021 19:58:38 +0200 From: Borislav Petkov To: Eugene Syromiatnikov Cc: "Yu, Yu-cheng" , x86@kernel.org, "H. Peter Anvin" , Thomas Gleixner , Ingo Molnar , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-api@vger.kernel.org, Arnd Bergmann , Andy Lutomirski , Balbir Singh , Cyrill Gorcunov , Dave Hansen , Florian Weimer , "H.J. Lu" , Jann Horn , Jonathan Corbet , Kees Cook , Mike Kravetz , Nadav Amit , Oleg Nesterov , Pavel Machek , Peter Zijlstra , Randy Dunlap , "Ravi V. Shankar" , Vedvyas Shanbhogue , Dave Martin , Weijiang Yang , Pengfei Xu , Haitao Huang Subject: Re: [PATCH v26 24/30] x86/cet/shstk: Introduce shadow stack token setup/verify routines Message-ID: References: <20210427204315.24153-1-yu-cheng.yu@intel.com> <20210427204315.24153-25-yu-cheng.yu@intel.com> <20210518001316.GR15897@asgard.redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20210518001316.GR15897@asgard.redhat.com> Authentication-Results: imf13.hostedemail.com; dkim=pass header.d=alien8.de header.s=dkim header.b=kE3yncmQ; spf=pass (imf13.hostedemail.com: domain of bp@alien8.de designates 5.9.137.197 as permitted sender) smtp.mailfrom=bp@alien8.de; dmarc=pass (policy=none) header.from=alien8.de X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: E6880E00010A X-Stat-Signature: z5hjtdgkgoqzd8i588hsf77rm5q39xxk X-HE-Tag: 1621361064-739236 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 Tue, May 18, 2021 at 02:14:14AM +0200, Eugene Syromiatnikov wrote: > Speaking of which, I wonder what would happen if a 64-bit process makes > a 32-bit system call (using int 0x80, for example), and gets a signal. I guess that's the next patch. And I see amluto has some concerns... /me goes read. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette