From patchwork Mon Jul 31 13:43:23 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 13334722 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D9375C41513 for ; Mon, 31 Jul 2023 13:53:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232710AbjGaNxk (ORCPT ); Mon, 31 Jul 2023 09:53:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43172 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233055AbjGaNxI (ORCPT ); Mon, 31 Jul 2023 09:53:08 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F181026AD; Mon, 31 Jul 2023 06:52:17 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 3B1956116E; Mon, 31 Jul 2023 13:52:17 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E2BDAC433C8; Mon, 31 Jul 2023 13:52:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1690811536; bh=AFWazg68H0m9wjDZ4noTEGRptXvqnY78FqkUfPNC3A0=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=qc9Cd3nsgAyvcnwoo8kjfvODViUMK/JrpplYrZmumxrpWFJkJgxfoQAAtQmXEy0Lk +BPICxB2b5iJoYLZwa0Jy5i1GxG9YIrojweNPdWyJVzG1jxxxRPdKVcGGNfBZEQN3d wsyQTHgkf2Uli6I54jqcE+RO9BXn+IUy/XBzVw71H52zCnwD+UnFVmUMjzhkXeisKT ndonCSJ6lvOmOBKfDsHnCf8OPCWOfK3Ab38QA5IevbVuoJI+Nd3ztF9g/4q46sXqwz 4ifG4jd0dqb7O5FLA4kXSOlehpBDXmsKLitwge5sUvbAwDZ3wl385xQYSuc/oRzuY9 NQbLtaaDejXyA== From: Mark Brown Date: Mon, 31 Jul 2023 14:43:23 +0100 Subject: [PATCH v3 14/36] arm64/idreg: Add overrride for GCS MIME-Version: 1.0 Message-Id: <20230731-arm64-gcs-v3-14-cddf9f980d98@kernel.org> References: <20230731-arm64-gcs-v3-0-cddf9f980d98@kernel.org> In-Reply-To: <20230731-arm64-gcs-v3-0-cddf9f980d98@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 , 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-099c9 X-Developer-Signature: v=1; a=openpgp-sha256; l=1796; i=broonie@kernel.org; h=from:subject:message-id; bh=AFWazg68H0m9wjDZ4noTEGRptXvqnY78FqkUfPNC3A0=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBkx7wfsdqpq88pf21TmYD/kSPpHacilejyJipE9rew 1epzW+eJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZMe8HwAKCRAk1otyXVSH0HDLB/ 4yUwsgP3uSC4+rw/h+6GLVLLbWnwEshdB3p5ype/gL221KLRVejx6eisgNL+pRT0FoOZasEebBFy7V l3F4UOacmzLSyAjRqciWaUncXUx9KC1IpVzU1S28E79KFcLF2vy+7j7EImZ8BKfvXMTxZGsE/GD1Um 9vmoI+8hK1BDY37dFDU4ybU203laJL21E1mO+eha2WzkwBUpZPwvvOADhgRsAhRugj9ZH2/+OVOO9i nKw/U0a4c7zTjo4m/ynqmyH4Q5Kve+hBrUTt7EX1y92BhSlWCUq7CE12LfbYdf5AFCm0sa+xlUQNy9 KrHgEE14UYJyMKjTyCJ53jOgHgF8Xz X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Hook up an override for GCS, allowing it to be disabled from the command line by specifying arm64.nogcs in case there are problems. Signed-off-by: Mark Brown --- Documentation/admin-guide/kernel-parameters.txt | 3 +++ arch/arm64/kernel/idreg-override.c | 2 ++ 2 files changed, 5 insertions(+) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index a1457995fd41..86662eed3003 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -418,6 +418,9 @@ arm64.nobti [ARM64] Unconditionally disable Branch Target Identification support + arm64.nogcs [ARM64] Unconditionally disable Guarded Control Stack + support + arm64.nopauth [ARM64] Unconditionally disable Pointer Authentication support diff --git a/arch/arm64/kernel/idreg-override.c b/arch/arm64/kernel/idreg-override.c index 2fe2491b692c..49269a5cff10 100644 --- a/arch/arm64/kernel/idreg-override.c +++ b/arch/arm64/kernel/idreg-override.c @@ -99,6 +99,7 @@ static const struct ftr_set_desc pfr1 __initconst = { .override = &id_aa64pfr1_override, .fields = { FIELD("bt", ID_AA64PFR1_EL1_BT_SHIFT, NULL ), + FIELD("gcs", ID_AA64PFR1_EL1_GCS_SHIFT, NULL), FIELD("mte", ID_AA64PFR1_EL1_MTE_SHIFT, NULL), FIELD("sme", ID_AA64PFR1_EL1_SME_SHIFT, pfr1_sme_filter), {} @@ -178,6 +179,7 @@ static const struct { { "arm64.nosve", "id_aa64pfr0.sve=0" }, { "arm64.nosme", "id_aa64pfr1.sme=0" }, { "arm64.nobti", "id_aa64pfr1.bt=0" }, + { "arm64.nogcs", "id_aa64pfr1.gcs=0" }, { "arm64.nopauth", "id_aa64isar1.gpi=0 id_aa64isar1.gpa=0 " "id_aa64isar1.api=0 id_aa64isar1.apa=0 "