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 A0CFDC5DF7E for ; Tue, 18 Aug 2026 14:12:08 +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=+XHe1sUYUazjYlpuT7B7U4qpnrUu+h4NJeX3hrVaTl0=; b=kmRUE0RGlwnAkzlosGUeNO4Ao1 yUw8o/V5XBQRRqRMV98ExLgd5cCB5B/IzlyrYY688dDdDqD0V4i1ERLbXWeFz1e45seEmzExOp9Id o3pTMDsX2lCMIlDu6qhf0Rr8CONadqOIplMpKhYxia5Oztbk1xeWdBIrW8hqhG99lkmdjrJdpScaN 1x9GnfhEgU9CT+NtgI5gopSnzCnkdEFm9aTXSN5KzokkzmmFv0mVKqZA+ndpoJbdpQvvYNS3BgoY6 O10mcE3nO1r0r1pCajfJrbUxLmket0pWJqfMlRDx8fN16rb55V5NQ3F6cDD1f7D4XxkzU4nc4VpE6 GYWwIscA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wwKXn-000000086qY-3B0n; Tue, 18 Aug 2026 14:11:59 +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 1wwKXh-000000086kQ-3z7S for linux-arm-kernel@lists.infradead.org; Tue, 18 Aug 2026 14:11:56 +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 1656319F0; Tue, 18 Aug 2026 07:11:48 -0700 (PDT) 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 518103F85F; Tue, 18 Aug 2026 07:11:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1787062311; bh=kXqkJA8gY7QYt5xJT2jkOr4U63cF8W3QQZTZyl1Ip7s=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=pwB51POAtGP/9qCYZBXWQWGQqL5WT4YbTPNR+fmalRIg8A9w8lCJfg6u4Bm2bgTMm W7iHo24RtbmP4U3VyqW/bZjJmZDsqfvOpGKTrpjMWFpE7szWiX6NfM/5GP0cAJUcTm 56mipm+spPi7X2YF+C4VRUn7xY23jbN4pEjzpN+U= From: Kevin Brodsky Date: Tue, 18 Aug 2026 15:08:48 +0100 Subject: [PATCH RFC v9 06/25] arm64: set_memory: Implement set_memory_pkey() MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260818-kpkeys-v9-6-743ad31b2c8f@arm.com> References: <20260818-kpkeys-v9-0-743ad31b2c8f@arm.com> In-Reply-To: <20260818-kpkeys-v9-0-743ad31b2c8f@arm.com> To: linux-hardening@vger.kernel.org Cc: Kevin Brodsky , Andrew Morton , 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-arm-kernel@lists.infradead.org, linux-mm@kvack.org, x86@kernel.org, Ira Weiny , Lorenzo Stoakes , Thomas Gleixner X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1787062276; l=2096; i=kevin.brodsky@arm.com; s=20260427; h=from:subject:message-id; bh=kXqkJA8gY7QYt5xJT2jkOr4U63cF8W3QQZTZyl1Ip7s=; b=QZRzpO9vg0xNAfLfr8c57o4N38qqxoegwPh4n/5n23eAhC52YuP3yXJcjY7W5PoxB3p2EK05u UWBdF8upHmEBUF3cCh3bAeipBSKcWH1pnnpOZcM1jn9k7skm8S4rmwN 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-20260818_071154_084417_7D918D3B X-CRM114-Status: GOOD ( 13.47 ) 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 Implement set_memory_pkey() using POE. Signed-off-by: Kevin Brodsky --- arch/arm64/include/asm/set_memory.h | 4 ++++ arch/arm64/mm/pageattr.c | 26 ++++++++++++++++++++++++++ 2 files changed, 30 insertions(+) diff --git a/arch/arm64/include/asm/set_memory.h b/arch/arm64/include/asm/set_memory.h index 90f61b17275e..b6cd6de34abf 100644 --- a/arch/arm64/include/asm/set_memory.h +++ b/arch/arm64/include/asm/set_memory.h @@ -19,4 +19,8 @@ bool kernel_page_present(struct page *page); int set_memory_encrypted(unsigned long addr, int numpages); int set_memory_decrypted(unsigned long addr, int numpages); +#ifdef CONFIG_ARCH_HAS_KPKEYS +int set_memory_pkey(unsigned long addr, int numpages, int pkey); +#endif + #endif /* _ASM_ARM64_SET_MEMORY_H */ diff --git a/arch/arm64/mm/pageattr.c b/arch/arm64/mm/pageattr.c index bbe98ac9ad8c..4d79f39570ed 100644 --- a/arch/arm64/mm/pageattr.c +++ b/arch/arm64/mm/pageattr.c @@ -9,6 +9,8 @@ #include #include #include +#include +#include #include #include @@ -365,6 +367,30 @@ int set_direct_map_valid_noflush(struct page *page, unsigned nr, bool valid) return set_memory_valid(addr, nr, valid); } +#ifdef CONFIG_ARCH_HAS_KPKEYS +int set_memory_pkey(unsigned long addr, int numpages, int pkey) +{ + unsigned long set_prot = 0; + + if (!kpkeys_supported()) + return 0; + + if (!__is_lm_address(kasan_reset_tag((void *)addr))) + return -EINVAL; + + if (pkey < 0 || pkey >= arch_max_pkey()) + return -EINVAL; + + set_prot |= pkey & BIT(0) ? PTE_PO_IDX_0 : 0; + set_prot |= pkey & BIT(1) ? PTE_PO_IDX_1 : 0; + set_prot |= pkey & BIT(2) ? PTE_PO_IDX_2 : 0; + + return __change_memory_common(addr, PAGE_SIZE * numpages, + __pgprot(set_prot), + __pgprot(PTE_PO_IDX_MASK)); +} +#endif + #ifdef CONFIG_DEBUG_PAGEALLOC /* * This is - apart from the return value - doing the same -- 2.51.2