Message ID | 20240203-arm64-gcs-v8-8-c9fec77673ef@kernel.org (mailing list archive) |
---|---|
State | New, archived |
Headers | show
Return-Path: <linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org> X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 5B513C4828D for <linux-arm-kernel@archiver.kernel.org>; Sat, 3 Feb 2024 12:30:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:Cc:To:In-Reply-To:References:Message-Id :MIME-Version:Subject:Date:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=GwKCsLOEWO6G8v9s/SO8qmWxZtywCyag3Nq+RBB0NFQ=; b=TozIyFd/zDuJWn dQwPiX0noQaNcsZz4BzH22Y/9x/7xu831QMf5PXeM4427Kdlb7fXAiwwwWzFW32L5Ke/14f0TD1nT egjvSE5vW3zWabUjGjzVd8yeGTxLsSocYoC+Wpe9ma8+bNCnGYys7npqnn5PIvhezVmfv4QI1tv3M JCeRjschh9RFxopcrVZ1pLlSffkfJLLOSkj2Kf+j/oCsS0c2R3tmHYEJaK+IdeKdUq5a0A/NBubeK k37wZeShRcxQR3uruX46X1ifSkXVbRxGOwqcSSJel9eDIXKdMOz0PRt55Tpsn2h4PZ0/EmT3X9OIv CLkSEh7yL+/Pf9COO5Jg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rWF9v-0000000GIUh-1WrD; Sat, 03 Feb 2024 12:30:11 +0000 Received: from sin.source.kernel.org ([2604:1380:40e1:4800::1]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1rWF9t-0000000GITc-1Frr; Sat, 03 Feb 2024 12:30:10 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sin.source.kernel.org (Postfix) with ESMTP id 2AA2FCE1EF7; Sat, 3 Feb 2024 12:30:07 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 74CBBC43394; Sat, 3 Feb 2024 12:29:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1706963405; bh=39WiY3pJD/byvb21132HZ1FFf2AaFNt9bxr2VNbG8Fw=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=shZj4zmbEG51YJXT2HR/hbkSqqeTtDXlNZZf7YSTfM8hx53j8LXpmJZLw3Iv82n8T EmsnjZlBS3Whdw84UibP2OywFky27fJU1kV1ZQZrvMHmo5oo6DDxG7Ve+KACATX2av DyY97pWgxe8gwFmEDtgEyjX1bk3f/dH3s4xHFsuiFE52tVb78u03HcN/O2BbuJHAi7 KNMQRWaioIbZCcU/WSDqiLZ81LH+jBUTthLazxEBHx9RWs8ibKA/VQQFMjwhktb/Sh 61x79dnbtbMxzrMbLJs9q2PhBw/ScBw5eG6rQTZlugcKruZnKQ6rD0cO+jKGPxrzE1 jHMBTdnV+2cdA== From: Mark Brown <broonie@kernel.org> Date: Sat, 03 Feb 2024 12:25:34 +0000 Subject: [PATCH v8 08/38] arm64/gcs: Provide put_user_gcs() MIME-Version: 1.0 Message-Id: <20240203-arm64-gcs-v8-8-c9fec77673ef@kernel.org> References: <20240203-arm64-gcs-v8-0-c9fec77673ef@kernel.org> In-Reply-To: <20240203-arm64-gcs-v8-0-c9fec77673ef@kernel.org> To: Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>, Jonathan Corbet <corbet@lwn.net>, Andrew Morton <akpm@linux-foundation.org>, Marc Zyngier <maz@kernel.org>, Oliver Upton <oliver.upton@linux.dev>, James Morse <james.morse@arm.com>, Suzuki K Poulose <suzuki.poulose@arm.com>, Arnd Bergmann <arnd@arndb.de>, Oleg Nesterov <oleg@redhat.com>, Eric Biederman <ebiederm@xmission.com>, Kees Cook <keescook@chromium.org>, Shuah Khan <shuah@kernel.org>, "Rick P. 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Series |
arm64/gcs: Provide support for GCS in userspace
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expand
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diff --git a/arch/arm64/include/asm/uaccess.h b/arch/arm64/include/asm/uaccess.h index 22e10e79f56a..e118c3d772c8 100644 --- a/arch/arm64/include/asm/uaccess.h +++ b/arch/arm64/include/asm/uaccess.h @@ -445,6 +445,24 @@ static inline int gcssttr(unsigned long __user *addr, unsigned long val) return err; } +static inline void put_user_gcs(unsigned long val, unsigned long __user *addr, + int *err) +{ + int ret; + + if (!access_ok((char __user *)addr, sizeof(u64))) { + *err = -EFAULT; + return; + } + + uaccess_ttbr0_enable(); + ret = gcssttr(addr, val); + if (ret != 0) + *err = ret; + uaccess_ttbr0_disable(); +} + + #endif /* CONFIG_ARM64_GCS */ #endif /* __ASM_UACCESS_H */
In order for EL1 to write to an EL0 GCS it must use the GCSSTTR instruction rather than a normal STTR. Provide a put_user_gcs() which does this. Signed-off-by: Mark Brown <broonie@kernel.org> --- arch/arm64/include/asm/uaccess.h | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+)