From patchwork Mon Oct 9 12:09:01 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 13413606 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 20B0CE95A96 for ; Mon, 9 Oct 2023 12:14:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:Cc:To:In-Reply-To:References:Message-Id :MIME-Version:Subject:Date:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=XTqAuETGlJb+YOCk/EqGblF8PZQYPL/2falXHY1nGU0=; b=lf/+kzEmhNHRyT TrCBG5G4qZsb5jrtGHBO3j90/Y3gUjzSZ5zdDpMmRQj9dsgUXyeSLD+4uh5iqXPLhPRyH8acxRvS2 7gjdznHQ7VRhhmSYhIprtfxi6pseJTe6+dva1kyGM8KZN48jMMKgrhsl72OCAqbdu1SybqSWSwST5 kx57BlVQ66H89jbzRjEWIBhS3LwALTXdAjyOfE0NyjKST5W/Zn3a1RlC7DTQ/+6yKyLQRFC0ccIaR qxdimC4+OptUbDk5AOew8rJGiG8NgiWpRoGcbxJjx1qQi5uns24FGM96OqmpoDfSUMrbfYPKJIOgu tKk9nzQ9uRNKHdqgd/yQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qpp9R-00Achm-09; Mon, 09 Oct 2023 12:14:21 +0000 Received: from ams.source.kernel.org ([145.40.68.75]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1qpp8v-00Ac8t-0i; Mon, 09 Oct 2023 12:13:56 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by ams.source.kernel.org (Postfix) with ESMTP id 65D05B81183; Mon, 9 Oct 2023 12:13:47 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 922A0C433C9; Mon, 9 Oct 2023 12:13:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1696853626; bh=HKr5dcgoD1HRE8Dfu3M7S45WXlztyGX1cPv4uDvvFRM=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=H39Ysk/jv3RNdJhL+Jsv7sBxcXZHRih+ROezijJvWx9EN4JvZ8YLVnCFWuh5eiiAl J3BcFT9L59aj2K0HyS0TQb5id7+eKSVp9IjZACZ4PEq4aEUJjOSP7GkJfDBzcp2Jrb u93V6DlJLKNe93rxNaei3Ow4LXKe+OKHKlwDOxFWm1SDJ76Ri39wH5qX2/YhNNY5DJ oZm3ml3SR7XSkXmMZ2NeCqJMYBJ305rEf0L35tZkyRCWXvoBdQFqFuMqNZgytHtcPR nvWKeRmVjuWn6bsz71J5LB+/nVGpBcBAqwMVSDG3VYjbyzwNtsmi2AWTk0W5qcRWwU zkc7oXD/SsHuA== From: Mark Brown Date: Mon, 09 Oct 2023 13:09:01 +0100 Subject: [PATCH v6 27/38] arm64: Add Kconfig for Guarded Control Stack (GCS) MIME-Version: 1.0 Message-Id: <20231009-arm64-gcs-v6-27-78e55deaa4dd@kernel.org> References: <20231009-arm64-gcs-v6-0-78e55deaa4dd@kernel.org> In-Reply-To: <20231009-arm64-gcs-v6-0-78e55deaa4dd@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 , Florian Weimer , Christian Brauner , 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-0438c X-Developer-Signature: v=1; a=openpgp-sha256; l=1334; i=broonie@kernel.org; h=from:subject:message-id; bh=HKr5dcgoD1HRE8Dfu3M7S45WXlztyGX1cPv4uDvvFRM=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBlI+2m6LbrIKImLz43AhLYkdJ+mn8/n/WtjdVAC+Y3 I5cZkuiJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZSPtpgAKCRAk1otyXVSH0C9JB/ 9PeuQ7odFNzac2es7G1H21MYtcjVH9+a2Xh/QADOSwBO/AZwG1T+Q4oNOVnGIYZhsMy5AUgOtQDFOg zDd8RXL2Yzchc4BhE4Ekw1h1A8Fde16BC4U8J5YyfbQTWzzV5ZjYMZRgWLWLEmJ82HR2bI/yfKju2O yiag57d6zPB3jBl31kU7tVUGxpZ+W2N3e3w0Lsn0dB/LatGzkRPssH45VRWQSLCiWocphZV2S0FttF 8NdpTgTettJANn4cQtR8Ybduqa7BR2LVBS9TWMxRVAdrv8KMfeizfOEaa1rfjudAGqmDa9T2OYofSN a9bEGUta99nzCir41mnHoSZ0Cwo785 X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231009_051349_586217_9ABEAB6C X-CRM114-Status: GOOD ( 12.04 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org 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 b10515c0200b..d235e725177b 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -2060,6 +2060,25 @@ 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