From patchwork Tue Aug 22 13:56:59 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 13360876 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 B139DEE49A3 for ; Tue, 22 Aug 2023 14:05:49 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 4C8B628002A; Tue, 22 Aug 2023 10:05:49 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 4780D280023; Tue, 22 Aug 2023 10:05:49 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 3192C28002A; Tue, 22 Aug 2023 10:05:49 -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 203F1280023 for ; Tue, 22 Aug 2023 10:05:49 -0400 (EDT) Received: from smtpin21.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay10.hostedemail.com (Postfix) with ESMTP id EC0F9C038A for ; Tue, 22 Aug 2023 14:05:48 +0000 (UTC) X-FDA: 81151913976.21.FA604AE Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by imf14.hostedemail.com (Postfix) with ESMTP id B720010004A for ; Tue, 22 Aug 2023 14:05:46 +0000 (UTC) Authentication-Results: imf14.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=dIUxNRrQ; dmarc=pass (policy=none) header.from=kernel.org; spf=pass (imf14.hostedemail.com: domain of broonie@kernel.org designates 139.178.84.217 as permitted sender) smtp.mailfrom=broonie@kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1692713146; 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:dkim-signature; bh=BnTPNnb7vLdvFR5WbrJlLKVTi36UZPFC5Hk16d0IDAo=; b=jV/20Q6WQtBbXFDfFsbsKJAw7PrkZr78BzCzuB4ZK85AVm8/YvP/0cJNplWT9NBGieIp+C rybaDu1o9tj1c+6XdoWLOF8qtRvaIJhgHLKBsSzGe55hzL/1WIqgWlabuV/W9qfm77qYMD uR1x/kwaRXQkPnUBDd0Z8kxdRyS/P2k= ARC-Authentication-Results: i=1; imf14.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=dIUxNRrQ; dmarc=pass (policy=none) header.from=kernel.org; spf=pass (imf14.hostedemail.com: domain of broonie@kernel.org designates 139.178.84.217 as permitted sender) smtp.mailfrom=broonie@kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1692713146; a=rsa-sha256; cv=none; b=j3xUd0M6UvXjeCD7JBDuM6zDEIrr7nmoloS7x2RQD8iHzWhkUnTgvX9qhOHziwXwEIsnZ9 y6qW25YZ0dusnFvm6nUCFlnqOhDQareSTxf0hrTpYs+iM9a+K6Q4113mD6wc1EFMNpJHE2 9rYA8B5z1T8El+AGgiSyLUyYQ8f6oh4= 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 E0A1765443; Tue, 22 Aug 2023 14:05:45 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C2EEFC433CD; Tue, 22 Aug 2023 14:05:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1692713145; bh=H5XnWdFwxjuGxEH72kUlpbP8cfBTQj97MLlaTYR448U=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=dIUxNRrQkD1AC9FBGH+9l0U9ZvUnTLslHNuzmoBYliSNiMjoHbh5dJU/cPaxEgnvQ fMyAmRdE1xxwHRmv2U0FDuaP0YabymuRE8p0HIUJdDHdd18evke32ASlni9odJAKqm kJOGYpk59tFXT22PC74wYB0KIJoWfCpeiU5hhDWUB9vH/IwGogNDkAhhlDJaR2e373 LaFNUIb/I4uzxYcTrr/taSDf1/Nn2KftPmQOmW8Q1wQ8E6JrC7klyzXff58QuUzCTL c3dqlJL3znAzBR6J4dn2qXFtJNYquax4v2ho5W2IWp4/tesIKEI19VWSJXP5CLEOMF 0fTJUjT2+MvZA== From: Mark Brown Date: Tue, 22 Aug 2023 14:56:59 +0100 Subject: [PATCH v5 26/37] arm64: Add Kconfig for Guarded Control Stack (GCS) MIME-Version: 1.0 Message-Id: <20230822-arm64-gcs-v5-26-9ef181dd6324@kernel.org> References: <20230822-arm64-gcs-v5-0-9ef181dd6324@kernel.org> In-Reply-To: <20230822-arm64-gcs-v5-0-9ef181dd6324@kernel.org> To: 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 Cc: "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, Mark Brown X-Mailer: b4 0.13-dev-034f2 X-Developer-Signature: v=1; a=openpgp-sha256; l=1334; i=broonie@kernel.org; h=from:subject:message-id; bh=H5XnWdFwxjuGxEH72kUlpbP8cfBTQj97MLlaTYR448U=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBk5MAEgUhGnrifDQTFSNQG5IJMFO4vUClMyRD9oH4B Sm9h0T+JATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZOTABAAKCRAk1otyXVSH0JoWB/ 4ztlxfSdMS7IVWSbChfjGpFHRePzfGZHEaisYlp3k0kgZx8bcwjiV3o02hzm5zftIak8w79jWQSmd3 aN3YkxU5jhpqq63aESrUMuKSdYOeIUwRDsu+s8slntzbARzAKK5Efjuzees8q/RKdd91jRnEOBAxgD HUsvaCGLSybMULc1imROdMfNWAef8n0HAHB6WQCtfcoBe7Pmv6V2eFz++vPOyyYRthGKShLfjHO9CF joqJBr0GX+lqZ//ckS4sVPKa8Aop/jc6SHwCaKJ1UCZx+6yMg1Q1o1EuCa3Mad1di9PSbfEMe6d6Qf 5Zt2G62F0VAglOrKBiG+LBDf7/bObx X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB X-Rspamd-Queue-Id: B720010004A X-Rspam-User: X-Rspamd-Server: rspam04 X-Stat-Signature: riyro7hx8y6mrromqkfb3hereddent7j X-HE-Tag: 1692713146-777520 X-HE-Meta: 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 XW4oYNge FSbe2hPnphOVBc6C4qgM/B42iK6gkAGccp4L/Uwx9pE4f+KkRb2XouwFhR+VWshBDwMUI6kpgWNUKGuzg7/XSFuBRCMUqrV//rGNeu5Firi8JFeCzALZUox2oshxZgewR+F0aYdFwuK8/4qzljIi1sths93Qp/50vsaHXdO8sFqMqs0vMAg8LxrZoiw/eiQ2VtbiAfgioEr82ZTM0Zs5h2bGVJ0usRRtSq+GL/Mh/HpG3HZKXLHTIcP4KRXcFDRMTxGhXU3ncnULj1Ek7Fk9d8vYYP9wNKgdgEfXvjTmRZx3gHUJ5QB/9ffxLBw0TybYq5y06N/iYBvusYqzh5sBoXH83NWxWSeWNAGPcZIrLrE3GSDHsy00HiBbsITBzPeDMbDhRTgnQGFWPdWmA/duorA2hfXVpwhKNSK/RMC6LhNcb4Ls= 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: 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 a2511b30d0f6..b5ef1a698770 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -2093,6 +2093,25 @@ 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 # "v9.4 architectural features" + config ARM64_SVE bool "ARM Scalable Vector Extension support" default y