From patchwork Tue Aug 22 13:56:34 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 13360824 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 E9D78EE49AE for ; Tue, 22 Aug 2023 14:03:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233351AbjHVODO (ORCPT ); Tue, 22 Aug 2023 10:03:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60436 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236234AbjHVODK (ORCPT ); Tue, 22 Aug 2023 10:03:10 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B82A7CD5; Tue, 22 Aug 2023 07:03:08 -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 3E90465726; Tue, 22 Aug 2023 14:03:08 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9638EC433CC; Tue, 22 Aug 2023 14:03:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1692712987; bh=pFAvrTvTUMO0xGKH/cMXrv1R9nlyUOOKoHgSKri2XFo=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=qTm9XTGvcYh+Br8eJUAeGbO/I6+6TObGxYTwfAxErZq7Ntyj+r+ZjZ36mVjjS7fby MGJHkozGMXiQgElJ1L/hdHWK5jS6K1IdwfgG9KFB0cPquHiAoreyGmmIaE94d5auZT rjpYop2VCduatHJPECR0bjHwBO9GubtNMy0N/6iGoLAWZEN1/T1a/pZ56+uoTSGifm wnKHoGJpjPpQVFEbG7W8LrY+Y/HsoFR9s1p6c//axRtaZ4h28qBqfFbSfM57TLqGYm bBjhEAgEE4xe1eR1F9baQN7ZtJmG9EQIaDzevsFHbvH7o4lc5g6GpvtWWOhLpiaI8I 5jsTDl5jo/oGQ== From: Mark Brown Date: Tue, 22 Aug 2023 14:56:34 +0100 Subject: [PATCH v5 01/37] arm64/mm: Restructure arch_validate_flags() for extensibility MIME-Version: 1.0 Message-Id: <20230822-arm64-gcs-v5-1-9ef181dd6324@kernel.org> References: <20230822-arm64-gcs-v5-0-9ef181dd6324@kernel.org> In-Reply-To: <20230822-arm64-gcs-v5-0-9ef181dd6324@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-034f2 X-Developer-Signature: v=1; a=openpgp-sha256; l=1303; i=broonie@kernel.org; h=from:subject:message-id; bh=pFAvrTvTUMO0xGKH/cMXrv1R9nlyUOOKoHgSKri2XFo=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBk5L/wf8ItiVhhsjU1U1pKaopo/uh7rIWP4I7WMtBO inLmxduJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZOS/8AAKCRAk1otyXVSH0AV6B/ 9NgV9lhw6oHPGtixcm5V3lAr7z+o9fWsFcBTBXWxSurUlb0XFjc+t7fDH7SvXhVDsM3caWcvDpNysc rUzR8kRdWUsc2c9LvqoaTcUMfW7SZ4LidddLAhjU+PCa1JGQoP92n9jN6TStbJ85YIH9l9KVVshmVZ XiPc6ANN4NmBzgKj9JGYlITGz4YnTicnXsOeD1e2p0e45JZx9f0hBIkU/lKRzsyIRzwpsY90K00Qz9 YGG3gusgb5P00L14xVRHrVAbuNMepnYq7a4rPyLGjenQCUiv8inCi9K4DWKE0JohN+V9sSbORNNply wIdHzUINXrAPZmj+TfHarlSM6uY9B7 X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Currently arch_validate_flags() is written in a very non-extensible fashion, returning immediately if MTE is not supported and writing the MTE check as a direct return. Since we will want to add more checks for GCS refactor the existing code to be more extensible, no functional change intended. Signed-off-by: Mark Brown --- arch/arm64/include/asm/mman.h | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) diff --git a/arch/arm64/include/asm/mman.h b/arch/arm64/include/asm/mman.h index 5966ee4a6154..c21849ffdd88 100644 --- a/arch/arm64/include/asm/mman.h +++ b/arch/arm64/include/asm/mman.h @@ -52,11 +52,17 @@ static inline bool arch_validate_prot(unsigned long prot, static inline bool arch_validate_flags(unsigned long vm_flags) { - if (!system_supports_mte()) - return true; + if (system_supports_mte()) { + /* + * only allow VM_MTE if VM_MTE_ALLOWED has been set + * previously + */ + if ((vm_flags & VM_MTE) && !(vm_flags & VM_MTE_ALLOWED)) + return false; + } + + return true; - /* only allow VM_MTE if VM_MTE_ALLOWED has been set previously */ - return !(vm_flags & VM_MTE) || (vm_flags & VM_MTE_ALLOWED); } #define arch_validate_flags(vm_flags) arch_validate_flags(vm_flags)