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 28A51EE49A4 for ; Tue, 22 Aug 2023 16:40:59 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 9827F280048; Tue, 22 Aug 2023 12:40:58 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 93217280046; Tue, 22 Aug 2023 12:40:58 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 7F96D280048; Tue, 22 Aug 2023 12:40:58 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0013.hostedemail.com [216.40.44.13]) by kanga.kvack.org (Postfix) with ESMTP id 70E54280046 for ; Tue, 22 Aug 2023 12:40:58 -0400 (EDT) Received: from smtpin20.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay08.hostedemail.com (Postfix) with ESMTP id 4F90A1402DD for ; Tue, 22 Aug 2023 16:40:58 +0000 (UTC) X-FDA: 81152304996.20.825A38C Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by imf20.hostedemail.com (Postfix) with ESMTP id BF25F1C0025 for ; Tue, 22 Aug 2023 16:40:56 +0000 (UTC) Authentication-Results: imf20.hostedemail.com; dkim=none; spf=pass (imf20.hostedemail.com: domain of cmarinas@kernel.org designates 139.178.84.217 as permitted sender) smtp.mailfrom=cmarinas@kernel.org; dmarc=fail reason="SPF not aligned (relaxed), No valid DKIM" header.from=arm.com (policy=none) ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1692722456; 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; bh=CiMP8RnOgZIIzYx/OWoV2/TvNXzVcLO7ctnegE7HBCk=; b=vS4+RUgBKqJygcoEmD575UP129wwBx/bqyXr6dQpMgbLPIQMoDxwAumyXsCGJR3+OQTAXO izeljszutjyd42Co0sfr3tyBRwo4yccwEfr08vsylM3ymhJjP37NLIBXC3b1q/S7Th7FpM UYhGxHrpNpAPCm22h677MQlzCTXhpdY= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1692722456; a=rsa-sha256; cv=none; b=eHId1HnECF3hK/MHrDktDUaXl5/9YsIOIgP8m435f6x320VBQ26Oa6/2sXiDJw2oOP+IS6 OpvwPw3ckeE/7GwXRvJHRI9qk8BtIhW4z7+3mjQsox6NpiQRfXxMFy0crojRRoLhWXt/Vr tJ0PIAohJUzCpq34SkNzx+itzRBB4tw= ARC-Authentication-Results: i=1; imf20.hostedemail.com; dkim=none; spf=pass (imf20.hostedemail.com: domain of cmarinas@kernel.org designates 139.178.84.217 as permitted sender) smtp.mailfrom=cmarinas@kernel.org; dmarc=fail reason="SPF not aligned (relaxed), No valid DKIM" header.from=arm.com (policy=none) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id D205B60D3A; Tue, 22 Aug 2023 16:40:55 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6B0B8C433C7; Tue, 22 Aug 2023 16:40:42 +0000 (UTC) Date: Tue, 22 Aug 2023 17:40:38 +0100 From: Catalin Marinas To: Mark Brown Cc: Will Deacon , Jonathan Corbet , Andrew Morton , Marc Zyngier , Oliver Upton , James Morse , Suzuki K Poulose , Arnd Bergmann , Oleg Nesterov , Eric Biederman , Kees Cook , Shuah Khan , "Rick P. Edgecombe" , Deepak Gupta , Ard Biesheuvel , Szabolcs Nagy , "H.J. Lu" , Paul Walmsley , Palmer Dabbelt , Albert Ou , linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, kvmarm@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org Subject: Re: [PATCH v4 21/36] arm64/mm: Implement map_shadow_stack() Message-ID: References: <20230807-arm64-gcs-v4-0-68cfa37f9069@kernel.org> <20230807-arm64-gcs-v4-21-68cfa37f9069@kernel.org> <9c722954-8f30-425e-a0a4-6edad463620f@sirena.org.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <9c722954-8f30-425e-a0a4-6edad463620f@sirena.org.uk> X-Stat-Signature: 41prtiz5usacauqzwkthqsmgwwy9jj4m X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: BF25F1C0025 X-Rspam-User: X-HE-Tag: 1692722456-77852 X-HE-Meta: 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 5lPYa80Z 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 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 18, 2023 at 06:08:52PM +0100, Mark Brown wrote: > On Fri, Aug 11, 2023 at 05:38:24PM +0100, Catalin Marinas wrote: > > > Given that we won't have an mmap(PROT_SHADOW_STACK), are we going to > > have restrictions on mprotect()? E.g. it would be useful to reject a > > PROT_EXEC on the shadow stack. > > mprotect() uses arch_validate_flags() which we're already having cover > this so it's already covered. I searched the patches and there's no change to the arm64 arch_validate_flags(). Maybe I missed it. -- Catalin