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 97D04C001DC for ; Mon, 17 Jul 2023 12:32:36 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 138958D0001; Mon, 17 Jul 2023 08:32:36 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 0E8A96B0074; Mon, 17 Jul 2023 08:32:36 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id EF1908D0001; Mon, 17 Jul 2023 08:32:35 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id DDD626B0072 for ; Mon, 17 Jul 2023 08:32:35 -0400 (EDT) Received: from smtpin28.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay10.hostedemail.com (Postfix) with ESMTP id 96B25C03C9 for ; Mon, 17 Jul 2023 12:32:35 +0000 (UTC) X-FDA: 81021042270.28.3FEBC8A Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) by imf27.hostedemail.com (Postfix) with ESMTP id EF6C940022 for ; Mon, 17 Jul 2023 12:32:32 +0000 (UTC) Authentication-Results: imf27.hostedemail.com; dkim=none; spf=pass (imf27.hostedemail.com: domain of jonathan.cameron@huawei.com designates 185.176.79.56 as permitted sender) smtp.mailfrom=jonathan.cameron@huawei.com; dmarc=pass (policy=quarantine) header.from=huawei.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1689597153; 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:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=qWpi1muryTnFB/wPu3+KFyyfNHpj9ONzeB8BY/6eAdE=; b=LvnYeJ9SMwTPQRB1KJt47bzuV9JrBNqtCL6TbbttfZd4rbUNNr32ZkeoH21zIv6AId9O9H kwg7F987UR3DX6hFIS75hbZstGW0/MMEs59MJi8pNvSpUCQx8PdvcrE+awQsL0YDpITM9F Q9V1lgPmWHy9LTL36T9bD0VzIYFZ6KY= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1689597153; a=rsa-sha256; cv=none; b=2wf4jJM2r6yM9VuYK1vMgut/wrnCdonr97u7VFAZ7lMVbtDrATomtu9zO5g2rJS1otDR1z yM+mLYGoapfhDSBl+9rjoSin/zDl0ZLg/GnVb7KnKfbMdelxdeEih/Zkscs/C/QsTuAUua IPEaI9RlvNJ2kkaQDp+4uj85hj97xUc= ARC-Authentication-Results: i=1; imf27.hostedemail.com; dkim=none; spf=pass (imf27.hostedemail.com: domain of jonathan.cameron@huawei.com designates 185.176.79.56 as permitted sender) smtp.mailfrom=jonathan.cameron@huawei.com; dmarc=pass (policy=quarantine) header.from=huawei.com Received: from lhrpeml500005.china.huawei.com (unknown [172.18.147.200]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4R4Lxz5Rfsz6J6nS; Mon, 17 Jul 2023 20:29:59 +0800 (CST) Received: from localhost (10.202.227.76) by lhrpeml500005.china.huawei.com (7.191.163.240) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.27; Mon, 17 Jul 2023 13:32:26 +0100 Date: Mon, 17 Jul 2023 13:32:25 +0100 From: Jonathan Cameron To: Mark Brown CC: Catalin Marinas , 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 , , , , , , , , , Subject: Re: [PATCH 26/35] arm64: Add Kconfig for Guarded Control Stack (GCS) Message-ID: <20230717133225.00000ce7@Huawei.com> In-Reply-To: <20230716-arm64-gcs-v1-26-bf567f93bba6@kernel.org> References: <20230716-arm64-gcs-v1-0-bf567f93bba6@kernel.org> <20230716-arm64-gcs-v1-26-bf567f93bba6@kernel.org> Organization: Huawei Technologies Research and Development (UK) Ltd. X-Mailer: Claws Mail 4.1.0 (GTK 3.24.33; x86_64-w64-mingw32) MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Originating-IP: [10.202.227.76] X-ClientProxiedBy: lhrpeml100003.china.huawei.com (7.191.160.210) To lhrpeml500005.china.huawei.com (7.191.163.240) X-CFilter-Loop: Reflected X-Rspamd-Queue-Id: EF6C940022 X-Rspam-User: X-Rspamd-Server: rspam11 X-Stat-Signature: u73fauuiqdfwua49pwrs6kosfr4c6x64 X-HE-Tag: 1689597152-240560 X-HE-Meta: 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 o1pcurqS 6A+8tXAU62FVQIEXg4iMLki/axwUQT/ALxvM6jXk2nP8mHqikQH9FoLERXchAvqOQpJ0qvZPycZLrxQ5VjSpEe6PPyFqED6K5D8XdgtQC09xjA7FAeXttt2fvI/WLCEwqkYSfvTOz715DgiOd4ggEPBZlQcmfXrRSmS2fvfc+AuOKp2eddxWy3pZMCUWSUIQFvsSFd8dNZ2zzyNhtbraVMLo2t9ceN+S/uk6YMffoP2XtqM1qApUPI/yZ8YlzsD+anZ51gO6MExWXcfr5cDAoa9r4nYBQgcRUtw8Hir6i5C2uyAThDUiec8cVfqFoKFTeUZxH8Ii0WxJROo4= 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 Sun, 16 Jul 2023 22:51:22 +0100 Mark Brown wrote: > Provide a Kconfig option allowing the user to select if GCS support is > built into the kernel. > > Signed-off-by: Mark Brown > --- > arch/arm64/Kconfig | 19 +++++++++++++++++++ > 1 file changed, 19 insertions(+) > > diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig > index 7856c3a3e35a..e1aeeda13c52 100644 > --- a/arch/arm64/Kconfig > +++ b/arch/arm64/Kconfig > @@ -2091,6 +2091,25 @@ config ARM64_EPAN > if the cpu does not implement the feature. > endmenu # "ARMv8.7 architectural features" > > +menu "v9.4 architectural features" > + > +config ARM64_GCS > + bool "Enable support for Guarded Control Stack (GCS)" > + default y > + select ARCH_USES_HIGH_VMA_FLAGS > + help > + Guarded Control Stack (GCS) provides support for a separate > + stack with restricted access which contains only return > + addresses. This can be used to harden against some attacks > + by comparing return address used by the program with what is > + stored in the GCS, and may also be used to efficiently obtain > + the call stack for applications such as profiling. > + > + The feature is detected at runtime, and will remain disabled > + if the system does not implement the feature. > + > +endmenu # "2022 archiectural features" Inconsistent naming and spelling mistake. > + > config ARM64_SVE > bool "ARM Scalable Vector Extension support" > default y >