From patchwork Thu Aug 1 12:06:53 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 13750492 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 26E8BC3DA64 for ; Thu, 1 Aug 2024 13:13:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Cc:To:In-Reply-To:References :Message-Id:Content-Transfer-Encoding:Content-Type: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=moSjIro1rCziUa1GHcyaGnSJrQya9rKM/lUeW/vDHA8=; b=wxCEgUQUJ/6NimO42Chm90eiLw RmVB1BZV4e32r4EF9tSFwmHVSe+G1ewKYUwBf4YxDJpeM3VhJV7BJf/wxAeE/wXgQhQH8VCoMXGYZ j1nVNY5yyWXxVPVp/krHYlwlbL1d1fWHVUiRGjzxbFXzIrZ6+SQbYmQHXqPTGPh5ALvn4OkTQbRnI ELoRTt//yhy951IyCaq4HfNVD5Eni6V8Pa9uYdIQSEY3ygCa+MvZWfJiNasQoFl8RLKC8/UxQXb0+ uitHky7xdIPPnB244uMPQQwQoGJVA/GWeWpAie+a6Be2sF11iphE/6cdGYjbO4wOsP9zSNwQD4Xqf GzAuXN+Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sZVbs-00000005QYg-0aYm; Thu, 01 Aug 2024 13:12:48 +0000 Received: from dfw.source.kernel.org ([2604:1380:4641:c500::1]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sZVPr-00000005Jb2-2ehX; Thu, 01 Aug 2024 13:00:25 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id 12FE2628A3; Thu, 1 Aug 2024 13:00:23 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A461EC4AF09; Thu, 1 Aug 2024 13:00:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1722517222; bh=jCz9TB/T2gtL+Dj1sBbCVvFYWqxLMS2lgt+ihDoyD98=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=Zdk/HN3Vv5MCR9tWdyaa/VEftixl5lcXiTlx9bdPKbc6eaT3FWEIZma95Z+GhffvM EcnEtjxjUMY7BtJNNzPCC7DDT43xLDYiM+AZJdYOlDlAIPK9JiTcxM9ZYM42+e7C+U 9M+FRULwYAKFy9B+Z/awaXXUyELOAV1XBrU0mp4w/mkVPsn/eOz7VKSFLsmAIwwW7B lew6XfI7DwPM58JgIGVw2nkB0gIogzXMI6WGBoekN/T1iW0VC3dDiHWS29AQH9c6VV IV9oIsnZ+4eQBNTMn/6CGQLJ5TBXgVfn0mxsqA1OzKNu7nMhgKP1rnDfsJkBxLzSKi FYf/bx/yCadnw== From: Mark Brown Date: Thu, 01 Aug 2024 13:06:53 +0100 Subject: [PATCH v10 26/40] arm64: Add Kconfig for Guarded Control Stack (GCS) MIME-Version: 1.0 Message-Id: <20240801-arm64-gcs-v10-26-699e2bd2190b@kernel.org> References: <20240801-arm64-gcs-v10-0-699e2bd2190b@kernel.org> In-Reply-To: <20240801-arm64-gcs-v10-0-699e2bd2190b@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 , 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=1438; i=broonie@kernel.org; h=from:subject:message-id; bh=jCz9TB/T2gtL+Dj1sBbCVvFYWqxLMS2lgt+ihDoyD98=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBmq4YaZfoQpmqEUbybjMAYNvLQbJaJ5ach0jFFKMwt WAXMRf6JATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZquGGgAKCRAk1otyXVSH0GzQB/ 0VUEM5IVaWGWCtsoHGuHQHdtM8+bn0nEmmu8lC+oIKaYCzNy9VMZzgyUqowYnTd7bPlWUz/Y86I44V RwpJj/EKex2ZFhiaMSKwZKk5ZycQwwdhmGqd8wkhELOTAU5tPmelrk1C5oPSDSLU5/cK5yCygjrcBh KSD25yGvlDBzmQwU8A2hU2FXizsVvxQGd/XPIkN4qnQLAWZKEaHYFH8a475LGnHg8uUfsFCToCPjWh 6YUfe9z6iCQUb0w218AdqDzqriKwGOuLBU2jkxLaydWomcfvewT1WWRsu2cMVLqUa0d9CiOZRK5wBg Uww68Gf9sKSJ6c/5O3iLSaPKkTUUYX 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-20240801_060023_864618_B0928AF6 X-CRM114-Status: GOOD ( 12.38 ) X-BeenThere: linux-arm-kernel@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-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Provide a Kconfig option allowing the user to select if GCS support is built into the kernel. Reviewed-by: Thiago Jung Bauermann Signed-off-by: Mark Brown Reviewed-by: Catalin Marinas --- arch/arm64/Kconfig | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index b3fc891f1544..83e27857bc6a 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -2127,6 +2127,26 @@ 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