From patchwork Wed Aug 28 23:27:18 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 13782090 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 2A6C61AE036; Wed, 28 Aug 2024 23:28:46 +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=1724887727; cv=none; b=HB3O9PKpgWGTNQJpmuipLM9TgFCQ7o6Vz0s67J+BkA94OezZfQBnTDU51CQFqf3phYI9YvHv5tR033dVweZx5/KyfiIQl+1l9/HWwcJX0DHcW/2w62Z9bdDTSGdn8n6I1/W7HguxB3wclHBqt80uWrClx7yJ25zAVNVjKwbc1Gg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724887727; c=relaxed/simple; bh=pHfZEKDzLLM4lr4zoXfluscujJ3LYl3h2pXq/J8hLlM=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=maqFPPqgtvCMHTD9oMEolleijikUNqnKa2L8nMlDOD7o6tEvEs3B2ywArBlsdvl/n5FPxo7fUKIJuN8iDmMLBynuc92noGdnz0Bx6X1KjiM0c4WiN0Q8zJl+1qX7qR7TVDd+xGW3N1AwkXHOk+ykBmZ6syMm4Vselu1cpW/48+k= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=rq++GcKR; 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="rq++GcKR" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BCED0C4CEC0; Wed, 28 Aug 2024 23:28:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1724887726; bh=pHfZEKDzLLM4lr4zoXfluscujJ3LYl3h2pXq/J8hLlM=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=rq++GcKRSvjv+PpuihZSyX+jI22rkXN+ahaJ3t3y5r8tOhGSsG32bALwOyi6zYXN+ eVkgXBG41Uv68iVxp4/e7dy2O7x7R9RL6V+bdhoGuS7S8B+ghf22V7W/Ls/kWbdLBo 7Is1GwWxO6TaQP0Tj7x6lsCbVCGUfXijCHMn6tEsRacuyEEVSbx2WXVHBZ96pD53Hf pmT3dpjzta4JENEwzaXB5sa+L7S1NKJnQCHIsWXQspmurerFzOEyKIifOvm+NSlcfW TzFOCynF53a2oPN11SQE0FwHZZfiWDjTdsJtv/mxFkMVO9x8PjMxmTb8sZsdxPuGhG +pVfHFtUnOF6w== From: Mark Brown Date: Thu, 29 Aug 2024 00:27:18 +0100 Subject: [PATCH v12 02/39] arm64/mm: Restructure arch_validate_flags() for extensibility Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240829-arm64-gcs-v12-2-42fec947436a@kernel.org> References: <20240829-arm64-gcs-v12-0-42fec947436a@kernel.org> In-Reply-To: <20240829-arm64-gcs-v12-0-42fec947436a@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 , 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-37811 X-Developer-Signature: v=1; a=openpgp-sha256; l=1425; i=broonie@kernel.org; h=from:subject:message-id; bh=pHfZEKDzLLM4lr4zoXfluscujJ3LYl3h2pXq/J8hLlM=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBmz7J6RoofHrvZefS5vfHSrIx3ilH92it2YpD+C2sU TzTMMvuJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZs+yegAKCRAk1otyXVSH0OzJB/ 9Gab3WMv/piiW9sI/VMmkzs26eYy2nciOZlr+bDnZbXBO3RS2k7ZKTA3UXP8pw+WP6f3OTrK2JMpfg ycY7eHztFNrujRTDsA1Fbnp4LEYMTUqMdaDxVz54T1PND+NB3VCmbCLle67gDrxjBhI0d/2ZdiBMlQ WlCVUNCOU4/GRZkhQPjvJpMhnxtqZ868DYBfql4xwV4z+fedBMTIIwQLcAO/sLgPIoTYb+If2GbG+R SnPQARoQRW3QsGmVzONtxPqheal1fPNH30HxTnD56qvbXOnHngyg3z0/KOYD9Zh06RHyr1ixJg8tZT ++7YZqvjMHAD6oGk6OoVaK0+39aOZh X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB 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. Reviewed-by: Thiago Jung Bauermann Reviewed-by: Catalin Marinas 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)