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Mon, 3 Feb 2025 02:19:57 -0800 (PST) From: Kevin Brodsky To: linux-hardening@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Kevin Brodsky , Andrew Morton , Mark Brown , Catalin Marinas , Dave Hansen , Jann Horn , Jeff Xu , Joey Gouly , Kees Cook , Linus Walleij , Andy Lutomirski , Marc Zyngier , Peter Zijlstra , Pierre Langlois , Quentin Perret , "Mike Rapoport (IBM)" , Ryan Roberts , Thomas Gleixner , Will Deacon , Matthew Wilcox , Qi Zheng , linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, x86@kernel.org Subject: [RFC PATCH v3 05/15] arm64: Implement asm/kpkeys.h using POE Date: Mon, 3 Feb 2025 10:18:29 +0000 Message-ID: <20250203101839.1223008-6-kevin.brodsky@arm.com> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20250203101839.1223008-1-kevin.brodsky@arm.com> References: <20250203101839.1223008-1-kevin.brodsky@arm.com> MIME-Version: 1.0 X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: C9E371C000A X-Stat-Signature: omqruyswyuabim4ipz9cqm7kn6mk6ik5 X-Rspam-User: X-HE-Tag: 1738578001-650000 X-HE-Meta: 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 jxVuQ/Qc s1c9PXgg0LBt/gGweTOdKlOkEo5uATMUIRBqM5XQBoz6VWgz2Q8djBvdvV4DTgYmkuksFbG18Ytu/ZtwQX7VPQp3OUA5/uSXjTgzEzG6KXkMq9xDIt6TVjr3JBprga927AIfSritrwkZ3etpSQXNuepr/00Apquj9zT/5Svi3M7meknjoYiN3V9yDE4OkfsyUgYQI 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 | 43 +++++++++++++++++++++++++++++++++ 1 file changed, 43 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..e17f6df41873 --- /dev/null +++ b/arch/arm64/include/asm/kpkeys.h @@ -0,0 +1,43 @@ +/* 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_set_pkey_perms(por, KPKEYS_PKEY_DEFAULT, POE_RXW); + + return por; +} + +static inline int arch_kpkeys_set_level(int level) +{ + u64 prev_por = read_sysreg_s(SYS_POR_EL1); + + write_sysreg_s(por_set_kpkeys_level(prev_por, level), SYS_POR_EL1); + isb(); + + return prev_por; +} + +static inline void arch_kpkeys_restore_pkey_reg(u64 pkey_reg) +{ + write_sysreg_s(pkey_reg, SYS_POR_EL1); + isb(); +} + +#endif /* CONFIG_ARM64_POE */ + +#endif /* __ASM_KPKEYS_H */