From patchwork Thu Aug 22 01:15:30 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 13772364 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 ED31B10A3D; Thu, 22 Aug 2024 01:21:36 +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=1724289697; cv=none; b=CJwXWJimrOuZ/1oyn1Bb4gxnreCGM3LZb6U00edEPoi2Uk5OOt+V+Z69mnq4l0GK6ZWVfQK7vW2eQyzpXqRqlv2B6XRA/hBNGO5d7wTU4EnJUL5PLADt9a0zjreFf1Sj0MQXp3chZgBpUvo/sEWUEYJyRJWLlONKKe18C5/HgTw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724289697; c=relaxed/simple; bh=dtxeJFa9YuBd+oBMECBxmd/jn10TctjlQUazqWWROYc=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=pPtueyxCWvnfnWdvJyb5xH3KLtGCLd1BcICI3h/quJ9b5BuKNL3fs5XS/Y0BErAjQZyTZJMKmpmVR2F8Tn+npG4G2S4vqYSDIJyN6DM29n2Zr5Eo33FDEn+RyFnvvvzwX55YTlzybtRsOXGmlakzoebEoup2IgvfACDIh4cx1Qo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=NkmOBJHK; 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="NkmOBJHK" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 108E0C32781; Thu, 22 Aug 2024 01:21:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1724289696; bh=dtxeJFa9YuBd+oBMECBxmd/jn10TctjlQUazqWWROYc=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=NkmOBJHKojz8DSwM6nYzZvbL6emtNKUeA7JkKQLB8uH5taYHO+I14fWAwDNwrTKB7 0T32RnpajPiK9jC/FzglUYmAX7r6zJ59RUqRXBuSXJOxiXwjDb/UhKmPt1EbV3ufOc dABlspAytswhq3Yzqww+v8myDmkXdtcKm9zrxvD8OIuvPeFnFDZfB3cE4jYYHWU1MH ABwSvvvgZs1w3wnnWqKyZr2EE4xwgT1y9mEuLK1fbheEle6qSyi79MUSXiYkZSLxsr SMDNlWpcM1ouaNsCfzmPBC+6Ds78A3H+FewAEcvhF+RTUbpS8mk13nVcAVNHuCBOTm zkNQ59HZYJQIw== From: Mark Brown Date: Thu, 22 Aug 2024 02:15:30 +0100 Subject: [PATCH v11 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: <20240822-arm64-gcs-v11-27-41b81947ecb5@kernel.org> References: <20240822-arm64-gcs-v11-0-41b81947ecb5@kernel.org> In-Reply-To: <20240822-arm64-gcs-v11-0-41b81947ecb5@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=1494; i=broonie@kernel.org; h=from:subject:message-id; bh=dtxeJFa9YuBd+oBMECBxmd/jn10TctjlQUazqWWROYc=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBmxpE4HX3waWR6P/nVlIS4iaRLKyJcXdN5BJ4frnqU HySFidqJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZsaROAAKCRAk1otyXVSH0EsBB/ 4ota43I49BjlXLJArTjty05r+82yt0hMdYO4E5E3AqVvSo6NYPm/EaH0sjMV4CXVYPSK7O8E5RULwI 70ZaN0kEcZcK7zfvzjnAUtxbQzQHxSo7KjIdrxwbReqbfZPJ2pcPCSPV57KutXRs6RpslMVS5Z7BDw bbgqBqDLv/lywndPg1znx2CFWWtZt9YgogyB3inCURWJFCpBsXqacbrtLejVxu9M2ESDMz9qkZyjVC BKMU3Fnvs6t1nq3gwuX4cnK7QzcBudiUV3jP3Cyjh64/YAqArluaXS9tRZK51HZOWT1qS3x918virB wdZaz1Pctay537JnWPba0phAwyJKVB 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 | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index a2f8ff354ca6..772f9ba99fe8 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -2137,6 +2137,26 @@ 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 + 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