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bh=hooPjsjsIbvprFGYibv5X1kiKmrNJ+rh2pNBQPPeZ1w=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=cxBe9I9ScYcoAOTS/OFjHAGQiqZgGNlGGBWkUdwU7WCHV6tU2ODTDMbfiWkk/zJFI kI5nzvHbO/BVLyhnpfk9SA1Xj1V45aKX8S1JDqUUcX5GE+w8D8NjfpXk1Y2rapTd3E 59k1tQjNecNSisDKU9/6nRV7i2uhAv1WRogEzlMg= From: Kevin Brodsky Date: Tue, 18 Aug 2026 15:08:45 +0100 Subject: [PATCH RFC v9 03/25] 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: <20260818-kpkeys-v9-3-743ad31b2c8f@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=1750; i=kevin.brodsky@arm.com; s=20260427; h=from:subject:message-id; bh=hooPjsjsIbvprFGYibv5X1kiKmrNJ+rh2pNBQPPeZ1w=; b=1dT1lR/GFlfvxoQ9U/r/5UWCPTPdNEIhZdGjKNljEItSAW0YGtPRacwISla75cwiUf8iE8VnY QXH2wDdZX6KAU8CDYSFW9KbkZLtQomPDKoRA8uGZOla8+9H532eoAgG X-Developer-Key: i=kevin.brodsky@arm.com; a=ed25519; pk=N2QG+eJKrvkNovwhhwJhnJ4+ScVfsGCHldmqLfcMTFs= X-Stat-Signature: g3budkj5exhhand5twnj6wo7b6fp81zf X-Rspamd-Queue-Id: D0B3C18000E X-Rspam-User: X-Rspamd-Server: rspam12 X-HE-Tag: 1787062297-655432 X-HE-Meta: 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 FdPWX4ra v/X1v5XkllDbBBcKQUoS3W7ouhbgYSIXQzObSOTHalGVmhfYmjdGrcchdWxs/wEvWaGGlmVK0xdPFsE2tFgwp7hrKwke3jK0z3d2QZgS1X99xKCdVI9pC888Nu1NQvS78ZMZjZEwdJ1UEtr6GIZYU7Sv53oLg0omA7Wg9yML3NflGQBi9+PKvTIsRMf1k9N7yxCKVnm9+zLY6ZgmphWeyeWZSoomV5jjYdmdUVqdC+/wALGUH/LMylBcM//qBkRiX1zHoQf1phySc2qzFJujdcISTDQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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) 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