From patchwork Wed Aug 28 23:27:43 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 13782150 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B30771AE031; Wed, 28 Aug 2024 23:31:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724887911; cv=none; b=hCGe1b67rEKJJz4iu6vuXaD/idxBt57BNcsd9IgqlKbvNXi+0Ka57sids5yeMiC8c5VkGdFJ6vtifLMP5Vwybbn+KyEDUhixF0Z5TGrHS4+RvrV1GKUXRo9/Wj2Yzv5+01pT3eu8drpk4i+SIRpAu+QFz81GbUSge3Z4WNQ6jB8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724887911; c=relaxed/simple; bh=beFDrtDyIwMIQ+9ZnRJrXKiqbsyL6F5ZUs+tNbRY4bo=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=AwqVPGDWXkK/YySTY4v89plwIy+qDXntz7irOpV/MWGDUTzoWeU8dQ1kdbJ773H1B8Opkx9JGK3p2UourbM4D0U2VGKcZIKjG4lEU2cBIGyB06eAkrejuSWcTVtCAtXi5Oetri7aY9Ulr6pWRTw8kyHGkD22Ok/opKTb13+sG/Y= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=cmxwoYiP; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="cmxwoYiP" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1FA6CC4CEC2; Wed, 28 Aug 2024 23:31:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1724887911; bh=beFDrtDyIwMIQ+9ZnRJrXKiqbsyL6F5ZUs+tNbRY4bo=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=cmxwoYiPlqAu3PpbAe4bGKFan0D35T9aFz1uyLOo8UJeOq5mAHsWPTyVNiP5qq+QF 1bJmwFkWzxk1xeCmgEZjTmbPypjyB2wMPlh4/9IEsgqdGpkxmvUz3PCfJH9PueVAL6 MKQBMKGgFzhwPuS8beYHyGbOiwMhjcRUsKrtqTZHRGCrVw+kmWWj1h9HXwUb6w3RWV FYKB2GvPgAUY/CCdj7QhVw+qDbhnzLjrekLZU+8Q32/0IagdbBbZuMFRTV3mEFcGaP m66+DiHgGeY1Hu80y6yk2xG+bH397ive8mzSUVwJSrPZmFjr4FhDO1y9KjCrF9iyRT i9cYNNLgL2fWw== From: Mark Brown Date: Thu, 29 Aug 2024 00:27:43 +0100 Subject: [PATCH v12 27/39] arm64: Add Kconfig for Guarded Control Stack (GCS) Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240829-arm64-gcs-v12-27-42fec947436a@kernel.org> References: <20240829-arm64-gcs-v12-0-42fec947436a@kernel.org> In-Reply-To: <20240829-arm64-gcs-v12-0-42fec947436a@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 , Shuah Khan , "Rick P. Edgecombe" , Deepak Gupta , Ard Biesheuvel , Szabolcs Nagy , Kees Cook Cc: "H.J. Lu" , Paul Walmsley , Palmer Dabbelt , Albert Ou , Florian Weimer , Christian Brauner , Thiago Jung Bauermann , Ross Burton , Yury Khrustalev , Wilco Dijkstra , 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 0.15-dev-37811 X-Developer-Signature: v=1; a=openpgp-sha256; l=1518; i=broonie@kernel.org; h=from:subject:message-id; bh=beFDrtDyIwMIQ+9ZnRJrXKiqbsyL6F5ZUs+tNbRY4bo=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBmz7KNVB+3I+jq6y04asLcwgZ/MwTq5s+oa0mg+YNh Yfgu4RqJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZs+yjQAKCRAk1otyXVSH0BPHB/ 90dYgJUIMJYlO9HaX+ruyrHyhuRC2pGtl9VBK2lNdeGXJ6Hvqi4owpgy/8/6e5omy6rq70EJZcWYul POQSUjKOHIw23YuSNSZgnq/G5o/jHmK1bUc5Vbn/iSGWK+Qdd/pAYigxHAfQZv40m5SgkAm+/vKLRP Cn4pGEJ7bm1AL0CKRoMgGxW7lo4EIWCdJDkr6hLUENHRWN15nlW1jpIfgtrYVfTm+AN7qx8NuUyjwp MoSbOf9pQqmotQKVb8unNR3EsDxcpUueJxVZgR9sSM8h2vGjIfeXq6D2SF/qtFM9p7KvJAd/F9OMXD x31o4oXplu9qcRnov3va3/52q6tZ/o X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB Provide a Kconfig option allowing the user to select if GCS support is built into the kernel. Reviewed-by: Thiago Jung Bauermann Reviewed-by: Catalin Marinas Signed-off-by: Mark Brown --- arch/arm64/Kconfig | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index a2f8ff354ca6..3fa682151c8f 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -2137,6 +2137,27 @@ 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_HAS_USER_SHADOW_STACK + select ARCH_USES_HIGH_VMA_FLAGS + depends on !UPROBES + 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