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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E9303C64EC4 for ; Mon, 6 Mar 2023 18:18:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229688AbjCFSSm (ORCPT ); Mon, 6 Mar 2023 13:18:42 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34426 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229651AbjCFSSl (ORCPT ); Mon, 6 Mar 2023 13:18:41 -0500 Received: from mail.skyhub.de (mail.skyhub.de [IPv6:2a01:4f8:190:11c2::b:1457]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0223F3B208; Mon, 6 Mar 2023 10:18:12 -0800 (PST) Received: from zn.tnic (p5de8e9fe.dip0.t-ipconnect.de [93.232.233.254]) (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 CA80D1EC04F0; Mon, 6 Mar 2023 19:16:55 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim; t=1678126615; 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=KEn/bkUTyalqJG9ZpefG0CIHtAi6+t0RHXyrbGtbP2g=; b=ehbCHpwqHzV6mptlGefZ0+7syjRW/Z7m0Gfw9mmaY4P5op+UQRUSO2WXe4prxJAEZr0lMF oycliX6YxTbIDSnAEZBZ3f/5cwI0pJwZCDzK8zrLFN3WHYQ8Es2ZISqv88QM6o0rGoiTdp CmEpUiACjbz+0ISQfFpN1AmRrv0BSKs= Date: Mon, 6 Mar 2023 19:16:55 +0100 From: Borislav Petkov To: "Edgecombe, Rick P" Cc: "david@redhat.com" , "bsingharora@gmail.com" , "hpa@zytor.com" , "Syromiatnikov, Eugene" , "peterz@infradead.org" , "rdunlap@infradead.org" , "keescook@chromium.org" , "Yu, Yu-cheng" , "dave.hansen@linux.intel.com" , "kirill.shutemov@linux.intel.com" , "Eranian, Stephane" , "linux-mm@kvack.org" , "fweimer@redhat.com" , "nadav.amit@gmail.com" , "jannh@google.com" , "dethoma@microsoft.com" , "kcc@google.com" , "linux-arch@vger.kernel.org" , "pavel@ucw.cz" , "oleg@redhat.com" , "hjl.tools@gmail.com" , "Yang, Weijiang" , "Lutomirski, Andy" , "linux-doc@vger.kernel.org" , "arnd@arndb.de" , "tglx@linutronix.de" , "Schimpe, Christina" , "mike.kravetz@oracle.com" , "x86@kernel.org" , "akpm@linux-foundation.org" , "debug@rivosinc.com" , "jamorris@linux.microsoft.com" , "john.allen@amd.com" , "rppt@kernel.org" , "andrew.cooper3@citrix.com" , "mingo@redhat.com" , "corbet@lwn.net" , "linux-kernel@vger.kernel.org" , "linux-api@vger.kernel.org" , "gorcunov@gmail.com" Subject: Re: [PATCH v7 22/41] mm/mmap: Add shadow stack pages to memory accounting Message-ID: <20230306181655.GCZAYuF7uBaFtKke9j@fat_crate.local> References: <20230227222957.24501-1-rick.p.edgecombe@intel.com> <20230227222957.24501-23-rick.p.edgecombe@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-arch@vger.kernel.org On Mon, Mar 06, 2023 at 06:11:32PM +0000, Edgecombe, Rick P wrote: > Before this version it was open coded, but David Hildenbrand suggested > this is_stack_mapping() solution. Should it be explained more, or just > dropped? Well, "adding a VM_SHADOW_STACK check in is_stack_mapping()" is what's in the diff already and it is kinda obvious. So why write what the patch does when one can simply look at the diff? -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette