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=-3.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,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 97892C4320A for ; Thu, 26 Aug 2021 17:27:58 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 4604F6103C for ; Thu, 26 Aug 2021 17:27:58 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 4604F6103C 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 C4F8B8D0002; Thu, 26 Aug 2021 13:27:57 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id BFFD78D0001; Thu, 26 Aug 2021 13:27:57 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id AEE918D0002; Thu, 26 Aug 2021 13:27:57 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0145.hostedemail.com [216.40.44.145]) by kanga.kvack.org (Postfix) with ESMTP id 91E2A8D0001 for ; Thu, 26 Aug 2021 13:27:57 -0400 (EDT) Received: from smtpin29.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 344CA26DF2 for ; Thu, 26 Aug 2021 17:27:57 +0000 (UTC) X-FDA: 78517914594.29.AA50F83 Received: from mail.skyhub.de (mail.skyhub.de [5.9.137.197]) by imf30.hostedemail.com (Postfix) with ESMTP id D4F31E00198F for ; Thu, 26 Aug 2021 17:27:56 +0000 (UTC) Received: from zn.tnic (p200300ec2f131000d5458c5ba0c26ca5.dip0.t-ipconnect.de [IPv6:2003:ec:2f13:1000:d545:8c5b:a0c2:6ca5]) (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 732D91EC0559; Thu, 26 Aug 2021 19:27:51 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim; t=1629998871; 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:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=7X9hy+BK0MrLN+oeN6aQ5lOMX3urBZA+yGYtxctLkPE=; b=qnSZuoWB5DiqTWlKZVhTTUXX5fDHmTwQKf69YtyR2gK7Okaxf51kEEXQRZ7yFdn7PwQHAB glYmFOZbCt2RGHOMxQymkOY92ddCqNcxJYamRl1mNIklK4lLYci3Dv/YkV7ZL8pnv7E6xb Z70jtdgdJqJVQksx/YGoAIFLokcvtes= Date: Thu, 26 Aug 2021 19:28:33 +0200 From: Borislav Petkov To: "H.J. Lu" Cc: Yu-cheng Yu , the arch/x86 maintainers , "H. Peter Anvin" , Thomas Gleixner , Ingo Molnar , LKML , "open list:DOCUMENTATION" , Linux-MM , linux-arch , Linux API , Arnd Bergmann , Andy Lutomirski , Balbir Singh , Cyrill Gorcunov , Dave Hansen , Eugene Syromiatnikov , Florian Weimer , 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: Authentication-Results: imf30.hostedemail.com; dkim=pass header.d=alien8.de header.s=dkim header.b=qnSZuoWB; dmarc=pass (policy=none) header.from=alien8.de; spf=pass (imf30.hostedemail.com: domain of bp@alien8.de designates 5.9.137.197 as permitted sender) smtp.mailfrom=bp@alien8.de X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: D4F31E00198F X-Stat-Signature: qwh6kt85fdm9m3knhxcqp8ijmw1z6ifj X-HE-Tag: 1629998876-563201 Content-Transfer-Encoding: quoted-printable 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 Thu, Aug 26, 2021 at 10:22:29AM -0700, H.J. Lu wrote: > > > + /* > > > + * Earlier clone() does not pass stack_size. Use RLIMIT_STAC= K and > > > > What is "earlier clone()"? >=20 > clone() doesn't have stack size info which was added to clone3(). /me goes and reads the manpage... clone3() The clone3() system call provides a superset of the functionalit= y of the older clone() interface. It also provides a number of API improvement= s, including: space for additional flags bits; cleaner separation in the use of= various argu=E2=80=90 ments; and the ability to specify the size of the child's stack ar= ea. Aha, Yu-cheng, pls use those words to make your comment understandable. Thx. --=20 Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette