From patchwork Tue Oct 1 13:36:17 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joey Gouly X-Patchwork-Id: 13818008 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 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 57C27CF64BE for ; Tue, 1 Oct 2024 13:39:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=c0dYh7PbdCPP/8Ei/6LJSWz1xW+ihra4b2Z1AYIpZB4=; b=zgqEEwE54V1qmQSCbRTouALq/l QDCFGdgck8MgG6kPitDAmLzDnlAKSt1N3a5SlgqsfXiGvQqdrNq8h/xswGIOdRN/XD3YblvwvGyyi ty7CNbwA8GTDLFYcvjhprMApMy7jiHwklSHtGLBdKYvjfKWqpPxeWmVqA0YubO6X7Ypkh/psKMCMg O7+Dd8ZfJCWjIYBEtf9mCwWSvz5hlVXKi8uU30r3GFNe4f3gWyWBGfW0905Az7dHIhOqeAPMaNE84 bu7ILDBvMI106cECbibIarwWobUPb0Pka2vpt1ylCp/j7577a3bZT/rcvyMWFKFpuPgjAMcfGoC1K AtkamikA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1svd5d-00000002ye3-3e7F; Tue, 01 Oct 2024 13:38:57 +0000 Received: from desiato.infradead.org ([2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1svd3H-00000002yDy-4Bxn for linux-arm-kernel@bombadil.infradead.org; Tue, 01 Oct 2024 13:36:32 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=Content-Transfer-Encoding:MIME-Version :References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=c0dYh7PbdCPP/8Ei/6LJSWz1xW+ihra4b2Z1AYIpZB4=; b=kf6dTMsHKGZuNpQRLXun6zNd9N FZ7u7fmsTImJ8xyyFpx7uqr1LMl6bgIr9BIchXTO+I39pd8Mv0/G3hNFua3HCzeW7oSgxMeZPUBhP RA1uJqTOY47yq/Fvi1vIbyrrBXzcmbU+CRAyfN/VFggsl55vv0vvC3AQMdQTHYo7AaGb5lVXeyTEl ffvlXbwf8XeEb5s3obLEMGrWEw7RM2OCxO/2X6ARZOdSj4usmIMsnx4Gyq6Mh0FgcRv/W1YVswDM8 gQYqchzWklefB69Xue/fj/ubfo2a3s55ft5XPDJMOeDPEWipDN7+6U255998iTfWgVg2ixlEdtfXh 7NDuJlYg==; Received: from foss.arm.com ([217.140.110.172]) by desiato.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1svd3E-000000037Qz-1yMi for linux-arm-kernel@lists.infradead.org; Tue, 01 Oct 2024 13:36:30 +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 2F710367; Tue, 1 Oct 2024 06:36:56 -0700 (PDT) Received: from e124191.cambridge.arm.com (e124191.cambridge.arm.com [10.1.197.45]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 7C8223F64C; Tue, 1 Oct 2024 06:36:25 -0700 (PDT) From: Joey Gouly To: linux-arm-kernel@lists.infradead.org Cc: catalin.marinas@arm.com, corbet@lwn.net, joey.gouly@arm.com, will@kernel.org, linux-doc@vger.kernel.org Subject: [PATCH v1 1/2] arm64: set POR_EL0 for kernel threads Date: Tue, 1 Oct 2024 14:36:17 +0100 Message-Id: <20241001133618.1547996-2-joey.gouly@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20241001133618.1547996-1-joey.gouly@arm.com> References: <20241001133618.1547996-1-joey.gouly@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241001_143628_643443_4F67C28F X-CRM114-Status: UNSURE ( 8.95 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Restrict kernel threads to only have RWX overlays for pkey 0. This matches what arch/x86 does, by defaulting to a restrictive PKRU. Signed-off-by: Joey Gouly Cc: Will Deacon Cc: Catalin Marinas --- arch/arm64/kernel/process.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c index 0540653fbf38..94f42df249e3 100644 --- a/arch/arm64/kernel/process.c +++ b/arch/arm64/kernel/process.c @@ -410,6 +410,9 @@ int copy_thread(struct task_struct *p, const struct kernel_clone_args *args) memset(childregs, 0, sizeof(struct pt_regs)); childregs->pstate = PSR_MODE_EL1h | PSR_IL_BIT; + if (system_supports_poe()) + p->thread.por_el0 = POR_EL0_INIT; + p->thread.cpu_context.x19 = (unsigned long)args->fn; p->thread.cpu_context.x20 = (unsigned long)args->fn_arg; }