From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=217.140.110.172 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794240082; b=x8NNGNm8OfJf+Sp61XBrZLPypwQ7fahdC+UW2+nXzsMevh/F3sCq9QEveYZiOKsxleTx wexBvi/b72TFXRvErcL6+idKFIgxLMuF9pBFhYCb3/Q+7EkXPc/4mJaKr6urW8DOs/eku sat06bCtremaeKc0MrQHoISXKv93MjUU2CYVtA17yKVEqLaVVcaCP4YbCRbEVnBgrWC2I 77IynbqHPRj9F7CMotX7PtmvYTHrmlOF/GeHcPdTULp8NNBTtRwHo7udi7LUta5kxRnOr XZd07FVGpCjCok7Cm9NgEyshJFzx38c9TeX635I7seCGUmfXLNjnrsK0Hw77QkoH1xg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794240082; h=DMARC-Filter:Received:Received:DKIM-Signature:From:Date:Subject: MIME-Version:Content-Type:Content-Transfer-Encoding:Message-Id: References:In-Reply-To:To:Cc:X-Mailer:X-Developer-Signature: X-Developer-Key; bh=dY9xuTSUx+VKL/ce4GOjJF5WW3kIPH+saWseajGc3UE=; b=m+R1Sayhe3luw3WIyVZpW9x24haMz90VUn33ssqyWqgR7b8WWdfbf/q/1mcnqKCFrY3i yKSDOHIZrd43SJFVdFcfSx/CyyHIJhFMPsOih3njWkldEJyekZ9QzM5SXgD4lkxeBK5dh +zOhP6/TeimAAJXAiQb298nKu9NadMNnm2EA/PABt4GcnVfLGJdcwri5YJvvBfL6LmbtM KzRI2osT4bP+wkdfr9i3Ez3JvJ2NH4YG/1y4j6LG1MHIqGmeCu0VCGv+8r9eHgXr8cyeh TOczxfqKRS+//hj6WgIaaeYKl4L9DdpYIyoYEivMULTQ9geZfSRyxeMI5/S439Ur7AQ== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=arm.com; spf=pass smtp.mailfrom=arm.com; dkim=pass header.d=arm.com header.i=@arm.com header.a=rsa-sha256 header.s=foss header.b=oWE9SHeT; arc=none smtp.remote-ip=217.140.110.172 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 68F5460A5BD1; Mon, 9 Nov 2026 16:01:22 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 68F5460A5BD1 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.a=rsa-sha256 header.s=foss header.b=oWE9SHeT 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 C96E51691; Mon, 9 Nov 2026 08:01:18 -0800 (PST) Received: from localhost.localdomain (e123572-lin.cambridge.arm.com [10.2.208.46]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id ECB673F632; Mon, 9 Nov 2026 08:01:16 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1794240081; bh=Y0zSXQuI73WVYRp+ApaQSKHcTrjkRu31AZuqJ4SX/+Y=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=oWE9SHeTz0Zr4EwuExxrKWPcs0DZPuSD1zxVxPYO66wezmOJmTn+Vxc23FrbAQ70L fXFbPD1rD0uD4dJXodLqZWxzK7X+y6B7JI3Po/gnxNx/lQq4JfEi3WG7xYnoBQ84H3 M2CLJMDSagcRY2kSgkjXrMFDzqNUs8cry8oWgozs= From: Kevin Brodsky Date: Mon, 09 Nov 2026 15:58:34 +0000 Subject: [PATCH RFC v10 09/22] arm64: mm: Enable overlays for all EL1 indirect permissions X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20261109-kpkeys-v10-9-aa6c4d9603bc@arm.com> References: <20261109-kpkeys-v10-0-aa6c4d9603bc@arm.com> In-Reply-To: <20261109-kpkeys-v10-0-aa6c4d9603bc@arm.com> To: linux-hardening@vger.kernel.org Cc: Kevin Brodsky , Andrew Morton , Ard Biesheuvel , Andy Lutomirski , Catalin Marinas , Dave Hansen , "David Hildenbrand (Arm)" , Jann Horn , Jeff Xu , Joey Gouly , Kees Cook , Linu Cherian , Linus Walleij , Marc Zyngier , Mark Brown , Matthew Wilcox , Maxwell Bland , "Mike Rapoport (IBM)" , Peter Zijlstra , Pierre Langlois , =?utf-8?q?Pierre-Cl=C3=A9ment_Tosi?= , Quentin Perret , Rick Edgecombe , Ryan Roberts , Vlastimil Babka , Will Deacon , Yang Shi , Yeoreum Yun , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, x86@kernel.org, Ira Weiny , Lorenzo Stoakes , Thomas Gleixner X-Mailer: b4 0.16.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1794240029; l=1848; i=kevin.brodsky@arm.com; s=20260427; h=from:subject:message-id; bh=Y0zSXQuI73WVYRp+ApaQSKHcTrjkRu31AZuqJ4SX/+Y=; b=DrIUmvyOStKkICsbTho2FY0JXL/3bvaGUJYYur70JPOyzgyrSslhzEX+PR7cTWOovxbTg9h/L DUVO/Ct8ZdXBsPzaw5R0LMJ9uaOUXPKQQA0Z3TwnP3F27plZAsjgHiW X-Developer-Key: i=kevin.brodsky@arm.com; a=ed25519; pk=N2QG+eJKrvkNovwhhwJhnJ4+ScVfsGCHldmqLfcMTFs= 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. Reviewed-by: David Hildenbrand (Arm) Reviewed-by: Yeoreum Yun Reviewed-by: Linu Cherian 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 590ef4328f12..eb779c0e892d 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 */ -- 2.56.0