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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 029D0FEFB6E for ; Fri, 27 Feb 2026 17:57:30 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 64BBF6B00BD; Fri, 27 Feb 2026 12:57:29 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 602F66B00BF; Fri, 27 Feb 2026 12:57:29 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 536416B00C0; Fri, 27 Feb 2026 12:57:29 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id 374126B00BD for ; Fri, 27 Feb 2026 12:57:29 -0500 (EST) Received: from smtpin06.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay05.hostedemail.com (Postfix) with ESMTP id EDCA35B704 for ; Fri, 27 Feb 2026 17:57:28 +0000 (UTC) X-FDA: 84490993776.06.9B39D4C Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by imf02.hostedemail.com (Postfix) with ESMTP id 88E7180010 for ; Fri, 27 Feb 2026 17:57:27 +0000 (UTC) Authentication-Results: imf02.hostedemail.com; dkim=none; spf=pass (imf02.hostedemail.com: domain of kevin.brodsky@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=kevin.brodsky@arm.com; dmarc=pass (policy=none) header.from=arm.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1772215047; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Uiv++dFAlObl1HHsG/K5OpEIqspmKksjUq9fFh1jeeo=; b=qWQsc3JsnZ13UOKOzQ4mgnohxp3gCRw20F8Q4NcZp0hm3QqQlqJG75dn29VJvDdtv4g5zu 0dWeNVqyiQFd7OdvQ6uoVLfSYhc9jFr3lp6hugAeAD/y1R47xady6JV8N1gWEfaJ2OPk/5 Db9t9c6mkYZE5YT6GlpsSVbL1XmOLSY= ARC-Authentication-Results: i=1; imf02.hostedemail.com; dkim=none; spf=pass (imf02.hostedemail.com: domain of kevin.brodsky@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=kevin.brodsky@arm.com; dmarc=pass (policy=none) header.from=arm.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1772215047; a=rsa-sha256; cv=none; b=HwNOkCwK4xXH0cxH2rrZWWODDijQefuNF3+Wv+eVZMDsQVSdiQrfQUCuUVo6CLr2vKtUDe UtwT49UirhzPVHjnqe9KWTA4LVcuQQPbg/SNCWOsNYe2LcDVSWaR905JW28PCWFsKDt8+m U8EzyKMr2dqvWbAjpohT9RMT8KQk3js= 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 737F419F0; Fri, 27 Feb 2026 09:57:20 -0800 (PST) Received: from e123572-lin.arm.com (e123572-lin.cambridge.arm.com [10.1.194.54]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 5D8A63F73B; Fri, 27 Feb 2026 09:57:22 -0800 (PST) From: Kevin Brodsky To: linux-hardening@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Kevin Brodsky , Andrew Morton , Andy Lutomirski , Catalin Marinas , Dave Hansen , David Hildenbrand , Ira Weiny , Jann Horn , Jeff Xu , Joey Gouly , Kees Cook , Linus Walleij , Lorenzo Stoakes , Marc Zyngier , Mark Brown , Matthew Wilcox , Maxwell Bland , "Mike Rapoport (IBM)" , Peter Zijlstra , Pierre Langlois , Quentin Perret , Rick Edgecombe , Ryan Roberts , Thomas Gleixner , Vlastimil Babka , Will Deacon , Yang Shi , Yeoreum Yun , linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, x86@kernel.org Subject: [PATCH v6 22/30] arm64: kpkeys: Support KPKEYS_LVL_PGTABLES Date: Fri, 27 Feb 2026 17:55:10 +0000 Message-ID: <20260227175518.3728055-23-kevin.brodsky@arm.com> X-Mailer: git-send-email 2.51.2 In-Reply-To: <20260227175518.3728055-1-kevin.brodsky@arm.com> References: <20260227175518.3728055-1-kevin.brodsky@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 88E7180010 X-Stat-Signature: bhxym6oc5bjg3tayxkp17xk957nsf1c4 X-Rspam-User: X-Rspamd-Server: rspam05 X-HE-Tag: 1772215047-325404 X-HE-Meta: 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Enable RW access to KPKEYS_PKEY_PGTABLES (used to map page table pages) if switching to KPKEYS_LVL_PGTABLES, otherwise only grant RO access. Signed-off-by: Kevin Brodsky --- arch/arm64/include/asm/kpkeys.h | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/arch/arm64/include/asm/kpkeys.h b/arch/arm64/include/asm/kpkeys.h index 79ae33388088..64d6e22740ec 100644 --- a/arch/arm64/include/asm/kpkeys.h +++ b/arch/arm64/include/asm/kpkeys.h @@ -12,7 +12,8 @@ * Equivalent to por_set_kpkeys_level(0, KPKEYS_LVL_DEFAULT), but can also be * used in assembly. */ -#define POR_EL1_INIT POR_ELx_PERM_PREP(KPKEYS_PKEY_DEFAULT, POE_RWX) +#define POR_EL1_INIT (POR_ELx_PERM_PREP(KPKEYS_PKEY_DEFAULT, POE_RWX) | \ + POR_ELx_PERM_PREP(KPKEYS_PKEY_PGTABLES, POE_R)) #ifndef __ASSEMBLY__ @@ -26,6 +27,8 @@ static inline bool arch_kpkeys_enabled(void) static inline u64 por_set_kpkeys_level(u64 por, int level) { por = por_elx_set_pkey_perms(por, KPKEYS_PKEY_DEFAULT, POE_RWX); + por = por_elx_set_pkey_perms(por, KPKEYS_PKEY_PGTABLES, + level == KPKEYS_LVL_PGTABLES ? POE_RW : POE_R); return por; } -- 2.51.2