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t=1779794233; bh=FtfnjjJofbi5jV3NeDm06k45kac8Me0VolOHCeDZ/oE=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=Fdl2Eoy8k1/opWjMUNyR4T9mLnSOb/00vt8zuuvYmw7/HnMpRTL4fos9jehKqWnvv qoAqlupxoj+/LgpxLplSATnbUc7A321zcNGBvJGhGKKfNVqp290bWX6WWJkobdITis 0nIN9IYODP64D9UCCWQCSD+ZDUrG1/4+Tf07Bn/M= From: Kevin Brodsky Date: Tue, 26 May 2026 12:15:52 +0100 Subject: [PATCH RFC v8 03/24] 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: <20260526-kpkeys-v8-3-eaaacdacc67c@arm.com> References: <20260526-kpkeys-v8-0-eaaacdacc67c@arm.com> In-Reply-To: <20260526-kpkeys-v8-0-eaaacdacc67c@arm.com> To: linux-hardening@vger.kernel.org Cc: Kevin Brodsky , Andrew Morton , Andy Lutomirski , Catalin Marinas , Dave Hansen , "David Hildenbrand (Arm)" , Ira Weiny , Jann Horn , Jeff Xu , Joey Gouly , Kees Cook , Linus Walleij , Marc Zyngier , Mark Brown , Matthew Wilcox , Maxwell Bland , "Mike Rapoport (IBM)" , Peter Zijlstra , Pierre Langlois , 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, Lorenzo Stoakes , Thomas Gleixner X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1779794211; l=1693; i=kevin.brodsky@arm.com; s=20260427; h=from:subject:message-id; bh=FtfnjjJofbi5jV3NeDm06k45kac8Me0VolOHCeDZ/oE=; b=qiEAw0NX1rX59s1vp2G26mnEMdUSA0T+/ZagKERunC5YmnGlfyESa6qGhCObFq6crvPRt0tZL xvWgPX4W5gaDO3mV932PN36adecv/yfBeKMsGsmjpDUGJf5wE2TVoOG X-Developer-Key: i=kevin.brodsky@arm.com; a=ed25519; pk=N2QG+eJKrvkNovwhhwJhnJ4+ScVfsGCHldmqLfcMTFs= X-Rspam-User: X-Rspamd-Queue-Id: 748BB4000C X-Stat-Signature: gpjifi915qfystpxk4qtdrmz4qusj3ka X-Rspamd-Server: rspam06 X-HE-Tag: 1779794234-877557 X-HE-Meta: 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 A2QSkXJS V46EH8KI+Zg0IlGdjynrBs88hwMBP05WqYmBj1j0o705UoqK/S7qa0p/NR93yhkhxRWLbFHxNZ+uW+V+3Tfj+0MPQnPUmlldcn0rj7Ukqx5+7APCgPLxVrH6IU1EiIKEoX3O2MDMMBu0bKMrq70JR5wZGuUzGx26MFJ28WjLu350XaMyRYEsFRzmuc0Vg9UbgjbBPzDRBQHwnrDbf7OgaHb2NjCpfq+g1v+F6WewjchWLg3S0dGYYXOWkeU1FKZKPdwYA 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. 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