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 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 60589CD5BB1 for ; Tue, 26 May 2026 11:17:26 +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:Cc:To:In-Reply-To:References :Message-Id:Content-Transfer-Encoding:Content-Type: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=7X/b4u6kPtvxlsc8SAbdzHGk+xYT247Ol9ilcqiHUcw=; b=vS7t+ojq2MJ1JoSdp6aUM8Iea9 T/aLdGo3BBGMBsK1iMWGrgro846YCi6zmyfY7Uck9JyWMkiO9zicOj5RpNULaVVm8mMddU/1jRacx sk3UT0/ylpsCl/a6P3xSocGcz++tPfPpt89Kw5zDaHzvJPOuylVY+NkCdFUzm0XAd5pFqELN1+hjn GrV8O+InijqOIDYiEcVWKbeFLjEALqyD4v44yW1+Ymq6N5O14MExnaepy5rRmhnoSQvYId4qXwZgA kFaDDjgcZ4sXTDQQL3Lcxj4LqmuP4m73CmTVg7/5s1gEaD5XxYb0Rxe47n7DIYXPCUquS+xUZBRlZ b8jPGsjQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wRpmi-00000001kEK-1JDB; Tue, 26 May 2026 11:17:20 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wRpmc-00000001kB3-2Fez for linux-arm-kernel@lists.infradead.org; Tue, 26 May 2026 11:17:15 +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 24EFF16F2; Tue, 26 May 2026 04:17:08 -0700 (PDT) Received: from localhost.localdomain (e123572-lin.cambridge.arm.com [10.1.194.54]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 57D823F86F; Tue, 26 May 2026 04:17:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1779794233; bh=FtfnjjJofbi5jV3NeDm06k45kac8Me0VolOHCeDZ/oE=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=Fdl2Eoy8k1/opWjMUNyR4T9mLnSOb/00vt8zuuvYmw7/HnMpRTL4fos9jehKqWnvv qoAqlupxoj+/LgpxLplSATnbUc7A321zcNGBvJGhGKKfNVqp290bWX6WWJkobdITis 0nIN9IYODP64D9UCCWQCSD+ZDUrG1/4+Tf07Bn/M= From: Kevin Brodsky Date: Tue, 26 May 2026 12:15:52 +0100 Subject: [PATCH RFC v8 03/24] arm64: mm: Enable overlays for all EL1 indirect permissions MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260526-kpkeys-v8-3-eaaacdacc67c@arm.com> References: <20260526-kpkeys-v8-0-eaaacdacc67c@arm.com> In-Reply-To: <20260526-kpkeys-v8-0-eaaacdacc67c@arm.com> To: linux-hardening@vger.kernel.org Cc: Kevin Brodsky , Andrew Morton , Andy Lutomirski , Catalin Marinas , Dave Hansen , "David Hildenbrand (Arm)" , Ira Weiny , Jann Horn , Jeff Xu , Joey Gouly , Kees Cook , Linus Walleij , Marc Zyngier , Mark Brown , Matthew Wilcox , Maxwell Bland , "Mike Rapoport (IBM)" , Peter Zijlstra , Pierre Langlois , Quentin Perret , Rick Edgecombe , Ryan Roberts , Vlastimil Babka , Will Deacon , Yang Shi , Yeoreum Yun , linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, x86@kernel.org, Lorenzo Stoakes , Thomas Gleixner X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1779794211; l=1693; i=kevin.brodsky@arm.com; s=20260427; h=from:subject:message-id; bh=FtfnjjJofbi5jV3NeDm06k45kac8Me0VolOHCeDZ/oE=; b=qiEAw0NX1rX59s1vp2G26mnEMdUSA0T+/ZagKERunC5YmnGlfyESa6qGhCObFq6crvPRt0tZL xvWgPX4W5gaDO3mV932PN36adecv/yfBeKMsGsmjpDUGJf5wE2TVoOG X-Developer-Key: i=kevin.brodsky@arm.com; a=ed25519; pk=N2QG+eJKrvkNovwhhwJhnJ4+ScVfsGCHldmqLfcMTFs= X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260526_041714_783802_F2AFE60C X-CRM114-Status: GOOD ( 11.96 ) 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 In preparation of using POE inside the kernel, enable "Overlay applied" for kernel memory types in PIR_EL1. This ensures that the permissions set in POR_EL1 affect all kernel mappings. User memory types must be left untouched (overlays not applied) because any privileged access to user memory (e.g. futex atomic without FEAT_LSUI) would then be mistakenly checked against POR_EL1. Signed-off-by: Kevin Brodsky --- arch/arm64/include/asm/pgtable-prot.h | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/arch/arm64/include/asm/pgtable-prot.h b/arch/arm64/include/asm/pgtable-prot.h index 212ce1b02e15..d4d45ab86a5a 100644 --- a/arch/arm64/include/asm/pgtable-prot.h +++ b/arch/arm64/include/asm/pgtable-prot.h @@ -183,9 +183,9 @@ static inline bool __pure lpa2_is_enabled(void) PIRx_ELx_PERM_PREP(pte_pi_index(_PAGE_SHARED_EXEC), PIE_RW) | \ PIRx_ELx_PERM_PREP(pte_pi_index(_PAGE_READONLY), PIE_R) | \ PIRx_ELx_PERM_PREP(pte_pi_index(_PAGE_SHARED), PIE_RW) | \ - PIRx_ELx_PERM_PREP(pte_pi_index(_PAGE_KERNEL_ROX), PIE_RX) | \ - PIRx_ELx_PERM_PREP(pte_pi_index(_PAGE_KERNEL_EXEC), PIE_RWX) | \ - PIRx_ELx_PERM_PREP(pte_pi_index(_PAGE_KERNEL_RO), PIE_R) | \ - PIRx_ELx_PERM_PREP(pte_pi_index(_PAGE_KERNEL), PIE_RW)) + PIRx_ELx_PERM_PREP(pte_pi_index(_PAGE_KERNEL_ROX), PIE_RX_O) | \ + PIRx_ELx_PERM_PREP(pte_pi_index(_PAGE_KERNEL_EXEC), PIE_RWX_O) | \ + PIRx_ELx_PERM_PREP(pte_pi_index(_PAGE_KERNEL_RO), PIE_R_O) | \ + PIRx_ELx_PERM_PREP(pte_pi_index(_PAGE_KERNEL), PIE_RW_O)) #endif /* __ASM_PGTABLE_PROT_H */ -- 2.51.2