From patchwork Sat Feb 3 12:25:52 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 13544206 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 A5AACC4828D for ; Sat, 3 Feb 2024 12:33:23 +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=1L9tMAVCf0zl4ck7HqyMMxDh8W8wu4Bg9EjT/99dFyg=; b=orU1Z4Jo/fcp9u XpJepVPXG1S1HlhiVhmA/ODuFtJP/6Cjt8xHiRL0zRoFrmNdHaGz7suGW7FlkDWyBx+bW3qsoAqF3 gJfj9WNr+c8T/Ainu7dzKeCxddvkv/YoXQbyskDD9jEEbl3elXaOlUlSCJvGVzhI+QbD86e4xdaom Tokmq+qc4D+hjf/PLOJYmtx1dhkkleV1WzkjRYSn/+62Cpia76UQn93Xx6/lmwkRTX0O5zDMbnb5J o+u01I5FYSLMgLkQ8MwBtyjCH8YONlhDlRU80DpQQrklflZTePay42DzhdOXM33hRZ+MjbbyHBbRC tQ8Id77dVG4ivjzQ+t0Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rWFCx-0000000GKws-1OhF; Sat, 03 Feb 2024 12:33:19 +0000 Received: from desiato.infradead.org ([2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1rWFCT-0000000GKUj-002y; Sat, 03 Feb 2024 12:32:49 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=Cc:To:In-Reply-To:References: Message-Id:Content-Transfer-Encoding:Content-Type:MIME-Version:Subject:Date: From:Sender:Reply-To:Content-ID:Content-Description; bh=KfEVhTOvR2NDwccNnzlCGckXv+scQ1CsuWB1eGX+74c=; b=DbDwLIyypxQf95gK67GdQDl3vO b5Tg2Cq2s5G2LH/+ybcHFqKVhOFeztnNgVZ1xNi2HxBVSKYVnZB8noN8Rsad0lI0BoDKZzx9VnF7i Um6fxnbeTuieLM7G/Jp65cL/+Y0nAcwj/TqxGhhmNbxHxfmBzNxnMcxF2Zmt9bSvH+uOo+rmkYvwS VQcXteYukrBNwQwlWiVU25Cpe5cZyLh0UtoMuq316Yqh0gJjeDWKTAn4nfTKrHpOWOPqa3m65b8eg ESmZeWGVlu1TYLWToMo0AZX/pFjJjOtV/vJx561TVntc6GbjGofLaHMwZ2EBjePnwZJo52131fIZN tzxRT5lw==; Received: from sin.source.kernel.org ([2604:1380:40e1:4800::1]) by desiato.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1rWFCL-0000000AlZ8-0hCY; Sat, 03 Feb 2024 12:32:47 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sin.source.kernel.org (Postfix) with ESMTP id 7963DCE1F0C; Sat, 3 Feb 2024 12:32:37 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 76DADC433F1; Sat, 3 Feb 2024 12:32:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1706963556; bh=RGzSIrmEW7Jf6evuT6565KZp1tpVwBC25PeiKV/XCIM=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=Rr0NlCUfUX2j3myBULSLJPalVM826rFJl0vTY3fYPNIAoGjsaWyYKxtBifaNm6sDv R3k3Z+e3/jgWq5+5PInC1Osi52ku2mCr6D9o1aURAOeLt+R2Zkk5U6R2wCML7xz6zk PG81g8AMxl2rVOrJUNnz2N35u5ho9Xg89aJIJj9OoWN9wFUIZ/qvSjm3ZM8I4h9hFC AbMSyA++bvK+sdEPPG3qzzEnAj62MLnGKSS32CcHHeeK/jUMKkKjE6RdyAZ+tvsviN dDdf/wFFm15nQghsG5q3BA7MRI+OHsHHN8xmcmlC7HDsvlRem/d2ChYl+uIz2gqkTZ rhMiIq5b7EusQ== From: Mark Brown Date: Sat, 03 Feb 2024 12:25:52 +0000 Subject: [PATCH v8 26/38] arm64: Add Kconfig for Guarded Control Stack (GCS) MIME-Version: 1.0 Message-Id: <20240203-arm64-gcs-v8-26-c9fec77673ef@kernel.org> References: <20240203-arm64-gcs-v8-0-c9fec77673ef@kernel.org> In-Reply-To: <20240203-arm64-gcs-v8-0-c9fec77673ef@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 , Thiago Jung Bauermann , 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-a684c X-Developer-Signature: v=1; a=openpgp-sha256; l=1372; i=broonie@kernel.org; h=from:subject:message-id; bh=RGzSIrmEW7Jf6evuT6565KZp1tpVwBC25PeiKV/XCIM=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBlvjDlwn8OBL1okRa937HDPu7LnBF8+tPg3W5TVRmQ TyRiYLiJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZb4w5QAKCRAk1otyXVSH0GddB/ 94PnXcnxhx9d3Igx3+8wyrY4sdF5KYIjmDuj3squkXqrrZ2tiirA6Q62mQp8vp+ezqY1jRXa4sYuJ6 S4br3364VBFwZURGrMoqdURAvnmTRIVSNGGYe6TRIoFURRVmXmsSb1Zx9GeUJE+887P2YThSn1hX4u UYhHuNxxIuI+/hGpYdkS35l+885fx4nMPUte+GNr+FvdEa6vqVjtRScIfSuKLmDgZ/N4wSajZL/k1q rBPuJY2ifU59ibgG/D9dxZieNsgex3LyQf29V2Ibhl6yWuOIeyY9K15eIuhbvVWh0jnwxw8K8dMwt4 yP307QaPCE4iW0R2nFKNxCYMzLGxW/ 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-20240203_123242_052925_8B38564C X-CRM114-Status: GOOD ( 11.57 ) 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 | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index aa7c1d435139..e0048e4660cf 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -2098,6 +2098,26 @@ 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