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a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1755248151; 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=aJoDwb/u3Nzlv4jn8+XZaODNbWbOa/Nrb+B9eqkeeBc=; b=LHCnIH6MvZGJG0N2syep073P0pBTuRXHNJPfqUPLjKuuv2WOroxSBdJYXcX5z7C5JAwlK0 PO0lLuqQbgEWKZJaCk7nagngt8ECAgluatVdGu5AaOrBSVUlfhYxvf1P2qmp0kOvo5EiFP B3v7J3UHQE8nO2Z2NfjCRy1D0czbhRc= 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 8534D1E32; Fri, 15 Aug 2025 01:55:42 -0700 (PDT) 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 2A4FC3F63F; Fri, 15 Aug 2025 01:55:46 -0700 (PDT) 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 , linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, x86@kernel.org Subject: [RFC PATCH v5 05/18] arm64: Implement asm/kpkeys.h using POE Date: Fri, 15 Aug 2025 09:54:59 +0100 Message-ID: <20250815085512.2182322-6-kevin.brodsky@arm.com> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20250815085512.2182322-1-kevin.brodsky@arm.com> References: <20250815085512.2182322-1-kevin.brodsky@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 8B8D74000B X-Stat-Signature: madsw6to7n3sioxjybweo74co6sdfzqn X-Rspam-User: X-HE-Tag: 1755248151-469350 X-HE-Meta: U2FsdGVkX1+abjVcxS6qERj8osRq9JCANnx7oYE1sA+TAqqzN1pv5ZzF05DWEHaAXa556yCeGufvBnd7L8cLLahOfmbNBNyy4XQfoHMLhvzukAy23heLJqzzzPhDX9cLzFGC5MZif7T4KeVytcNtHSizgpY11d0nYbo9n73tGcDcyQo/LN95ZAR9ClyS3z8QByDijM5VWM1MnNWx+u/W2Vz6gX1ApMKvOF2JLJ+mL/yA6FrzlxqJL2nY5kevPcRhpJosZ3fzI8nyeW5Lw4pOiD1Rsd0UcEiX9ZwGAG0IA5CwxiMtOTKX7gq9kHlW7q6eSHs5mIdziycRopv0VUPFUH34ColOZcBFjCPsarZqcjUFBfnJBIgfOSzXIqR9BgYJFuBE+BkNxLYLcFT6cgFyGVkKA8KYsT0tRySBY0TGf0JKAbgW3KyALrJFVx0mNE6fYQzlkzUSG6vUMiFOC53Rjup/y7Bk0/61mfcwKrD/gR/a/c4UUJM0zAwVRWrn2bK4lT3i6vh+LUw3I5r3YvURHTiImKC/gX2miNFqFzZorueglD1AKZ7TikK3fTTs43PUqZ7efNv7ZUwE8Tjg4EWh2Ux/+VEELmHmylqULosengBND8AW/41frCsL6BxIEQ10T9FydEsEKT8IGplppJ4JMFiTpRseSg/q/c8TcuLLlDErCsxu1rnSYpcQfkBbE52MPORMfzc8EK3uro5Xto3XlTYa9lCWYME4JSz71o0ShOLkcIKubbnviXay9SJmMwD2U+X5Yl0kp0Q3UXGzAm4x0/E99s7Skhiu0Vmz7K1C8zA1VJnPndeR5xkM3tH24imSdJxCwcoX/YdQXkfjo3xNgxfeOyz5+aPysWLHOrG9a2F4xxAywK8dad2QL32pUlmv X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Implement the kpkeys interface if CONFIG_ARM64_POE is enabled. The permissions for KPKEYS_PKEY_DEFAULT (pkey 0) are set to RWX as this pkey is also used for code mappings. Signed-off-by: Kevin Brodsky --- arch/arm64/include/asm/kpkeys.h | 49 +++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 arch/arm64/include/asm/kpkeys.h diff --git a/arch/arm64/include/asm/kpkeys.h b/arch/arm64/include/asm/kpkeys.h new file mode 100644 index 000000000000..3b0ab5e7dd22 --- /dev/null +++ b/arch/arm64/include/asm/kpkeys.h @@ -0,0 +1,49 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +#ifndef __ASM_KPKEYS_H +#define __ASM_KPKEYS_H + +#include +#include +#include + +#include + +static inline bool arch_kpkeys_enabled(void) +{ + return system_supports_poe(); +} + +#ifdef CONFIG_ARM64_POE + +static inline u64 por_set_kpkeys_level(u64 por, int level) +{ + por = por_elx_set_pkey_perms(por, KPKEYS_PKEY_DEFAULT, POE_RWX); + + return por; +} + +static __always_inline void __kpkeys_set_pkey_reg_nosync(u64 pkey_reg) +{ + write_sysreg_s(pkey_reg, SYS_POR_EL1); +} + +static __always_inline int arch_kpkeys_set_level(int level) +{ + u64 prev_por = read_sysreg_s(SYS_POR_EL1); + u64 new_por = por_set_kpkeys_level(prev_por, level); + + __kpkeys_set_pkey_reg_nosync(new_por); + isb(); + + return prev_por; +} + +static __always_inline void arch_kpkeys_restore_pkey_reg(u64 pkey_reg) +{ + __kpkeys_set_pkey_reg_nosync(pkey_reg); + isb(); +} + +#endif /* CONFIG_ARM64_POE */ + +#endif /* __ASM_KPKEYS_H */ -- 2.47.0