From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-17.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4EE24C433E6 for ; Wed, 6 Jan 2021 10:37:16 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id EE5A323102 for ; Wed, 6 Jan 2021 10:37:15 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EE5A323102 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:MIME-Version:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:References:In-Reply-To:Message-Id:Date:Subject:To: From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=eEqWdfyR89bUyxHLePgmlGWCUIx2QXKz5gRwqALGCRA=; b=PFbp9hNvqgcFx/KlgCtExNJXm8 MgJF5R+NwoE3E0+vC9ppD9tFEttwG9ng7to3SrCqSwrPF7qgAK6gv2Evvv3fxpLiUdcj/MJpfopaU JTLzTfIcvj6Wyt2Z2nb2wNnX3zNS+HSXbfAiWX9cxadagUenxgrJ6TFIMhvxqqv65uUB99Bfq5dsN M2XNr1GvpvyWefXbBgmM9vBy48WXoQLQEyaWZy3P1eUUPE2vBZWjBZA6vtMjRT5BqExDBig2K38uL CDMd5KGt72HnhuJpQSN0UMNJQa63t/JVUoO/Xl799T1oLgXnJlXHJVoOTJnCB/knnn3jMDc09MFtT NOAgf2RA==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kx69p-0000tg-RG; Wed, 06 Jan 2021 10:35:13 +0000 Received: from foss.arm.com ([217.140.110.172]) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kx69l-0000sQ-29 for linux-arm-kernel@lists.infradead.org; Wed, 06 Jan 2021 10:35:10 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 1EE04106F; Wed, 6 Jan 2021 02:35:08 -0800 (PST) Received: from donnerap.arm.com (donnerap.cambridge.arm.com [10.1.195.35]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 3B3D73F719; Wed, 6 Jan 2021 02:35:06 -0800 (PST) From: Andre Przywara To: Will Deacon , Catalin Marinas , Ard Biesheuvel , Russell King , Marc Zyngier Subject: [PATCH v6 3/5] ARM: implement support for SMCCC TRNG entropy source Date: Wed, 6 Jan 2021 10:34:51 +0000 Message-Id: <20210106103453.152275-4-andre.przywara@arm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210106103453.152275-1-andre.przywara@arm.com> References: <20210106103453.152275-1-andre.przywara@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210106_053509_288986_F6CD7C7A X-CRM114-Status: GOOD ( 18.15 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Lorenzo Pieralisi , Theodore Ts'o , Linus Walleij , linux-kernel@vger.kernel.org, Mark Brown , Sudeep Holla , kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Ard Biesheuvel Implement arch_get_random_seed_*() for ARM based on the firmware or hypervisor provided entropy source described in ARM DEN0098. This will make the kernel's random number generator consume entropy provided by this interface, at early boot, and periodically at runtime when reseeding. Cc: Linus Walleij Cc: Russell King Signed-off-by: Ard Biesheuvel [Andre: rework to be initialised by the SMCCC firmware driver] Signed-off-by: Andre Przywara Reviewed-by: Linus Walleij --- arch/arm/Kconfig | 4 ++ arch/arm/include/asm/archrandom.h | 64 +++++++++++++++++++++++++++++++ 2 files changed, 68 insertions(+) diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 138248999df7..bfe642510b0a 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1644,6 +1644,10 @@ config STACKPROTECTOR_PER_TASK Enable this option to switch to a different method that uses a different canary value for each task. +config ARCH_RANDOM + def_bool y + depends on HAVE_ARM_SMCCC_DISCOVERY + endmenu menu "Boot options" diff --git a/arch/arm/include/asm/archrandom.h b/arch/arm/include/asm/archrandom.h index a8e84ca5c2ee..f3e96a5b65f8 100644 --- a/arch/arm/include/asm/archrandom.h +++ b/arch/arm/include/asm/archrandom.h @@ -2,9 +2,73 @@ #ifndef _ASM_ARCHRANDOM_H #define _ASM_ARCHRANDOM_H +#ifdef CONFIG_ARCH_RANDOM + +#include +#include + +#define ARM_SMCCC_TRNG_MIN_VERSION 0x10000UL + +extern bool smccc_trng_available; + +static inline bool __init smccc_probe_trng(void) +{ + struct arm_smccc_res res; + + arm_smccc_1_1_invoke(ARM_SMCCC_TRNG_VERSION, &res); + if ((s32)res.a0 < 0) + return false; + if (res.a0 >= ARM_SMCCC_TRNG_MIN_VERSION) { + /* double check that the 32-bit flavor is available */ + arm_smccc_1_1_invoke(ARM_SMCCC_TRNG_FEATURES, + ARM_SMCCC_TRNG_RND32, + &res); + if ((s32)res.a0 >= 0) + return true; + } + + return false; +} + +static inline bool __must_check arch_get_random_long(unsigned long *v) +{ + return false; +} + +static inline bool __must_check arch_get_random_int(unsigned int *v) +{ + return false; +} + +static inline bool __must_check arch_get_random_seed_long(unsigned long *v) +{ + struct arm_smccc_res res; + + if (smccc_trng_available) { + arm_smccc_1_1_invoke(ARM_SMCCC_TRNG_RND32, 8 * sizeof(*v), &res); + + if (res.a0 != 0) + return false; + + *v = res.a3; + return true; + } + + return false; +} + +static inline bool __must_check arch_get_random_seed_int(unsigned int *v) +{ + return arch_get_random_seed_long((unsigned long *)v); +} + + +#else /* !CONFIG_ARCH_RANDOM */ + static inline bool __init smccc_probe_trng(void) { return false; } +#endif /* CONFIG_ARCH_RANDOM */ #endif /* _ASM_ARCHRANDOM_H */ -- 2.17.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel