From patchwork Tue Oct 1 22:58:47 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 13818856 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 843E7194AD1; Tue, 1 Oct 2024 23:01:30 +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=1727823690; cv=none; b=nw9M+AcuYjsoVQGjViQApBPZeJauzMnkf7ZSt7sQrj0SbXHgZQberUA0J8+AucdMcpYgwZjj6lBfxZfH85EInRCiePx8bHnchCpidh7n7HcyZp2MjGrIHKR8Sxl5ncNIlgK7EJFtHQcjTqczl1E+HxJyW9Y3MbDPy29g+cKi+E8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727823690; c=relaxed/simple; bh=cWAEuqYZg+17LABQvN9oRF3fUQ66H1+faDLiqviD7Rg=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=Y3tGikya+V2BeOyA8Pr9R2naulIYPQ7WuhRF3JKGRFwpFnvrAOed9FfxekUOfCFfseD+iQvL/rQ0lYDZqtMXsbvNFSXga0ezW9wDtWe4MzlF3OrUKLWdjjTFwWSbg4oA+Cawm4hXE5kj2H606/PoYrk8894VPCtrfjZBxqtLj7o= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=JVOwfzln; 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="JVOwfzln" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EF7FFC4CEC6; Tue, 1 Oct 2024 23:01:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1727823690; bh=cWAEuqYZg+17LABQvN9oRF3fUQ66H1+faDLiqviD7Rg=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=JVOwfzlnQ1yPBDbyHnBgjdhX8SQ8mjDy1QRkyFkl+gx37UIxMkNToKrHVI1wydeCy RvfGEfIUbYLBkyn5jLSMtS4EU1FuCrXR9nErfytRVB8rKmIeiUyzqTAXya3u5hSYSW ZBqvuVQ+khkZqPwaAr87X/XDdwoPeZijmcaMzMRbnvSldy09sAicXE81Snt3Ig6vI0 OC4JtKB6DHV97T5dceAw0Jo4Bhxw6j2Y/6yYFnKqZbGelN+KxP2Y/5mZwrYxZIAI4z 3LSsPRBfwp/s0bVks8hgqIqV80OhU249mQTsriYGh3sReyLGn6wuVQhtXoHqTkFdWt MzUy1utdiCF1g== From: Mark Brown Date: Tue, 01 Oct 2024 23:58:47 +0100 Subject: [PATCH v13 08/40] arm64/sysreg: Add definitions for architected GCS caps Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241001-arm64-gcs-v13-8-222b78d87eee@kernel.org> References: <20241001-arm64-gcs-v13-0-222b78d87eee@kernel.org> In-Reply-To: <20241001-arm64-gcs-v13-0-222b78d87eee@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 , David Spickett , 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-99b12 X-Developer-Signature: v=1; a=openpgp-sha256; l=1514; i=broonie@kernel.org; h=from:subject:message-id; bh=cWAEuqYZg+17LABQvN9oRF3fUQ66H1+faDLiqviD7Rg=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBm/H7KzFUM+Tl6KY9+ZmIs9ee3X2SFnChzVHp/wsKS BBUyQIuJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZvx+ygAKCRAk1otyXVSH0IRzB/ 40t5IAmsVTGi7QY/R5VsHa1iNQj0hKlpetd6TJOdMvRKsXR7+KpNuOvRgAkbhlDXCwJYjeU4V4pZTC 49GPGeYHCub8P8aKfD8/+tiWv28sHcRKtOz1ur8l73Orsj2Cd/ed/JcBfulU4rXfyfI0SpWxr9JucH OwLTLsF1AA17SaFcrEInmJ2dOxjQOIIXfZ7+rCJWC1BBDKx5VwB19cZ07spFGUITn5wpQr3Gzb/8wK jyrS73oi0ChXeCFjRaYAEy8XRgWK3W/PS/rbmSvFxKS0Br/eqUVWIMTnB7+8JZ4zsPVbUs3ZdGhLY9 5ld0bkuoXsL76SMw36DmJc7xoDL2LX X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB The architecture defines a format for guarded control stack caps, used to mark the top of an unused GCS in order to limit the potential for exploitation via stack switching. Add definitions associated with these. Reviewed-by: Thiago Jung Bauermann Acked-by: Catalin Marinas Signed-off-by: Mark Brown --- arch/arm64/include/asm/sysreg.h | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h index 9ea97dddefc4..9c98ff448bd9 100644 --- a/arch/arm64/include/asm/sysreg.h +++ b/arch/arm64/include/asm/sysreg.h @@ -1101,6 +1101,26 @@ /* Initial value for Permission Overlay Extension for EL0 */ #define POR_EL0_INIT POE_RXW +/* + * Definitions for Guarded Control Stack + */ + +#define GCS_CAP_ADDR_MASK GENMASK(63, 12) +#define GCS_CAP_ADDR_SHIFT 12 +#define GCS_CAP_ADDR_WIDTH 52 +#define GCS_CAP_ADDR(x) FIELD_GET(GCS_CAP_ADDR_MASK, x) + +#define GCS_CAP_TOKEN_MASK GENMASK(11, 0) +#define GCS_CAP_TOKEN_SHIFT 0 +#define GCS_CAP_TOKEN_WIDTH 12 +#define GCS_CAP_TOKEN(x) FIELD_GET(GCS_CAP_TOKEN_MASK, x) + +#define GCS_CAP_VALID_TOKEN 0x1 +#define GCS_CAP_IN_PROGRESS_TOKEN 0x5 + +#define GCS_CAP(x) ((((unsigned long)x) & GCS_CAP_ADDR_MASK) | \ + GCS_CAP_VALID_TOKEN) + #define ARM64_FEATURE_FIELD_BITS 4 /* Defined for compatibility only, do not add new users. */