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=-10.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 05844C4320E for ; Thu, 26 Aug 2021 16:49:59 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 838EC6102A for ; Thu, 26 Aug 2021 16:49:58 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 838EC6102A Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=alien8.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id 2915B8D0003; Thu, 26 Aug 2021 12:49:58 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 219D28D0002; Thu, 26 Aug 2021 12:49:58 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 1086F8D0003; Thu, 26 Aug 2021 12:49:58 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0049.hostedemail.com [216.40.44.49]) by kanga.kvack.org (Postfix) with ESMTP id E73BF8D0002 for ; Thu, 26 Aug 2021 12:49:57 -0400 (EDT) Received: from smtpin04.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 5EDA020307 for ; Thu, 26 Aug 2021 16:49:57 +0000 (UTC) X-FDA: 78517818834.04.1BD197B Received: from mail.skyhub.de (mail.skyhub.de [5.9.137.197]) by imf06.hostedemail.com (Postfix) with ESMTP id 1CF2D801AB03 for ; Thu, 26 Aug 2021 16:49:55 +0000 (UTC) Received: from zn.tnic (p200300ec2f131000dba9b80c472eda01.dip0.t-ipconnect.de [IPv6:2003:ec:2f13:1000:dba9:b80c:472e:da01]) (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 D62201EC05A0; Thu, 26 Aug 2021 18:49:50 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim; t=1629996590; 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=xrrLoUFQeTzSv38tX8kg/sBY3s9iE6Grlnu4Ib+IL4w=; b=Niz6S7oZDR2Axj3lptRap8tMoCfDtYU0aCE/5Ruk8qqTLxFk4LNQ3Yb9tm2laIvHHeU9xg RY9zVoTSpMpeYsaJrK/baDxYAh7/jRThR7B7v3AN/yQG8N8w/MVg6288Rrsjhye+e/lXwa 8WPKCUbtMwXvxyQ4bDhuAA87KVWHCss= Date: Thu, 26 Aug 2021 18:50:26 +0200 From: Borislav Petkov To: Yu-cheng Yu Cc: 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 , Eugene Syromiatnikov , 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" , Dave Martin , Weijiang Yang , Pengfei Xu , Haitao Huang , Rick P Edgecombe Subject: Re: [PATCH v29 25/32] x86/cet/shstk: Handle thread shadow stack Message-ID: References: <20210820181201.31490-1-yu-cheng.yu@intel.com> <20210820181201.31490-26-yu-cheng.yu@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20210820181201.31490-26-yu-cheng.yu@intel.com> Authentication-Results: imf06.hostedemail.com; dkim=pass header.d=alien8.de header.s=dkim header.b=Niz6S7oZ; spf=pass (imf06.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-Stat-Signature: ec4mdkr4xmdanktbk8hc8q7frw5dpq6n X-Rspamd-Queue-Id: 1CF2D801AB03 X-Rspamd-Server: rspam04 X-HE-Tag: 1629996595-408242 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, Aug 20, 2021 at 11:11:54AM -0700, Yu-cheng Yu wrote: > diff --git a/arch/x86/kernel/shstk.c b/arch/x86/kernel/shstk.c > index 5993aa8db338..7c1ca2476a5e 100644 > --- a/arch/x86/kernel/shstk.c > +++ b/arch/x86/kernel/shstk.c > @@ -75,6 +75,61 @@ int shstk_setup(void) > return err; > } > > +int shstk_alloc_thread_stack(struct task_struct *tsk, unsigned long clone_flags, > + unsigned long stack_size) > +{ > + struct thread_shstk *shstk = &tsk->thread.shstk; > + struct cet_user_state *state; > + unsigned long addr; > + > + if (!shstk->size) > + return 0; > + > + /* > + * Earlier clone() does not pass stack_size. Use RLIMIT_STACK and What is "earlier clone()"? > + * cap to 4 GB. > + */ -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette