From patchwork Tue Jun 25 14:57:34 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 13711312 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 76F1C17109B; Tue, 25 Jun 2024 15:01:24 +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=1719327684; cv=none; b=IjU+kBWvJ4Ey//q9IW6LkoAfEL/B0g1NGh0uIwEi/PAT2CyiomDMoEITxnaJMcHlB/IfeZgfQz+9r+8ugt0BXdX+DsyPAH0NhbXZ6nqmgc6Bhmcu+fy0akdpsJ88/wX5YpSowZ9hRJhf90+eyCoywrqDHP8dNZNCtiA1i4mqpPg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719327684; c=relaxed/simple; bh=OtVuYnhHZ3Ff9iifqi0z8zMYVHFXjow5mOcREWek5jw=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=WjHyIWqqZFJ64jFYLz3GIHEYritFm5qJyAEdP+l2tvLxwzqAoE4gVJ1AL9/ESZM37aEfC/YdsI/PRc790S2XetNj16Oe+qBCUQ35ja6mTsNXss5w8S5DBQ7miZsmGjWrj8JL7tNwBTBTRZ+1pgBKcmc8TQEIsH9UCJMDC0E3L14= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=tBApK9Cr; 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="tBApK9Cr" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9A0C7C4AF0C; Tue, 25 Jun 2024 15:01:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1719327684; bh=OtVuYnhHZ3Ff9iifqi0z8zMYVHFXjow5mOcREWek5jw=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=tBApK9CrubSeAIcZz7A44caQcV2AMjXOrBWKOAQ3YTROjS6A3B4P8v4DYUloTh3iu L2JunxfQe6hZaIBlEPk9nSW/4o4pQZmJ/DFcV3ws0UAQ2v71qgRnh8O5ROxwbkVS2u Od4fFEhLHznvAgb0qV5QQr4wYTOrgQxeo8iT/UyiHXH2mwQ2Gv2eBlAo0sUKyHa2/H EpnCO7nOAwCEH3PE/YoT1josQRX1DA+TcpWW/DUzAO+2gk4RVwbzuTXJNrK+uZkuae 1NtJZFXhf4RCRNResyygODc36rxxsXvch8b78J0So8bQnWcrBWUvDry124M1g2R/jY 7LKsbul7AtnxA== From: Mark Brown Date: Tue, 25 Jun 2024 15:57:34 +0100 Subject: [PATCH v9 06/39] 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: <20240625-arm64-gcs-v9-6-0f634469b8f0@kernel.org> References: <20240625-arm64-gcs-v9-0-0f634469b8f0@kernel.org> In-Reply-To: <20240625-arm64-gcs-v9-0-0f634469b8f0@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 0.14-dev-d4707 X-Developer-Signature: v=1; a=openpgp-sha256; l=1421; i=broonie@kernel.org; h=from:subject:message-id; bh=OtVuYnhHZ3Ff9iifqi0z8zMYVHFXjow5mOcREWek5jw=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBmett2xSPtaVh5MhskCkWC9d+Vs/ZeudvczR6T8fnM pi3EiCKJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZnrbdgAKCRAk1otyXVSH0A6RB/ 9c9lgKwWs8KNFn8y602zbLtUWWDwRky5DJm0wa9ndVkr99Np3G6Sgp0kjHCrAME1Jhs3loF7ZRybJP cE8qjsWIDeZ5xnO1Xyk9fkQnHnEnm+mx6iD3x4MjqpDs+Llqis9IJMXZUXdHhR+S5XUJHaNOUmE9d4 OVBHUXg7rMVfhK+/LBd9eQgwyt+T37LYbSEJE4mDUJL25MGhqGZ/C7KVwXwFLuAD9Ego1WlN6c1Jux E69W8dgNbYY5tptjL9vw8zgrp+QLEHvMwCxgPYkTzlK49PHBow+u8sN1eOjKFNvIYEKwHwcmDTHJWI ofycDRnMbkf8lWLsyocl3/o+4LmsPY 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 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 af3b206fa423..325a1daa98ed 100644 --- a/arch/arm64/include/asm/sysreg.h +++ b/arch/arm64/include/asm/sysreg.h @@ -1064,6 +1064,26 @@ #define POE_RXW UL(0x7) #define POE_MASK UL(0xf) +/* + * 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. */