From: Kevin Brodsky <kevin.brodsky@arm•com>
To: linux-hardening@vger•kernel.org
Cc: Kevin Brodsky <kevin.brodsky@arm•com>,
Andrew Morton <akpm@linux-foundation•org>,
Andy Lutomirski <luto@kernel•org>,
Catalin Marinas <catalin.marinas@arm•com>,
Dave Hansen <dave.hansen@linux•intel.com>,
"David Hildenbrand (Arm)" <david@kernel•org>,
Ira Weiny <ira.weiny@intel•com>, Jann Horn <jannh@google•com>,
Jeff Xu <jeffxu@chromium•org>, Joey Gouly <joey.gouly@arm•com>,
Kees Cook <kees@kernel•org>, Linus Walleij <linusw@kernel•org>,
Marc Zyngier <maz@kernel•org>, Mark Brown <broonie@kernel•org>,
Matthew Wilcox <willy@infradead•org>,
Maxwell Bland <mbland@motorola•com>,
"Mike Rapoport (IBM)" <rppt@kernel•org>,
Peter Zijlstra <peterz@infradead•org>,
Pierre Langlois <pierre.langlois@arm•com>,
Quentin Perret <qperret@google•com>,
Rick Edgecombe <rick.p.edgecombe@intel•com>,
Ryan Roberts <ryan.roberts@arm•com>,
Vlastimil Babka <vbabka@kernel•org>,
Will Deacon <will@kernel•org>,
Yang Shi <yang@os•amperecomputing.com>,
Yeoreum Yun <yeoreum.yun@arm•com>,
linux-arm-kernel@lists•infradead.org, linux-mm@kvack•org,
x86@kernel•org, Lorenzo Stoakes <ljs@kernel•org>,
Thomas Gleixner <tglx@kernel•org>
Subject: [PATCH RFC v8 03/24] arm64: mm: Enable overlays for all EL1 indirect permissions
Date: Tue, 26 May 2026 12:15:52 +0100 [thread overview]
Message-ID: <20260526-kpkeys-v8-3-eaaacdacc67c@arm.com> (raw)
In-Reply-To: <20260526-kpkeys-v8-0-eaaacdacc67c@arm.com>
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 <kevin.brodsky@arm•com>
---
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
next prev parent reply other threads:[~2026-05-26 11:17 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-26 11:15 [PATCH RFC v8 00/24] pkeys-based page table hardening Kevin Brodsky
2026-05-26 11:15 ` [PATCH RFC v8 01/24] mm: Introduce kpkeys Kevin Brodsky
2026-05-26 13:17 ` Linus Walleij
2026-05-27 8:24 ` Kevin Brodsky
2026-05-26 11:15 ` [PATCH RFC v8 02/24] set_memory: Introduce set_memory_pkey() stub Kevin Brodsky
2026-05-26 11:15 ` Kevin Brodsky [this message]
2026-05-26 11:15 ` [PATCH RFC v8 04/24] arm64: Introduce por_elx_set_pkey_perms() helper Kevin Brodsky
2026-05-26 11:15 ` [PATCH RFC v8 05/24] arm64: Implement asm/kpkeys.h using POE Kevin Brodsky
2026-05-26 11:15 ` [PATCH RFC v8 06/24] arm64: set_memory: Implement set_memory_pkey() Kevin Brodsky
2026-05-26 11:15 ` [PATCH RFC v8 07/24] arm64: Context-switch POR_EL1 Kevin Brodsky
2026-05-26 11:15 ` [PATCH RFC v8 08/24] arm64: Initialize POR_EL1 register on cpu_resume() Kevin Brodsky
2026-05-26 11:15 ` [PATCH RFC v8 09/24] arm64: Enable kpkeys Kevin Brodsky
2026-05-26 11:15 ` [PATCH RFC v8 10/24] memblock: Move INIT_MEMBLOCK_* macros to header Kevin Brodsky
2026-05-26 11:16 ` [PATCH RFC v8 11/24] mm: kpkeys: Introduce kpkeys_hardened_pgtables feature Kevin Brodsky
2026-05-26 11:16 ` [PATCH RFC v8 12/24] mm: kpkeys: Protect regular page tables Kevin Brodsky
2026-05-26 11:16 ` [PATCH RFC v8 13/24] mm: kpkeys: Introduce early page table allocator Kevin Brodsky
2026-05-26 11:16 ` [PATCH RFC v8 14/24] mm: kpkeys: Protect vmemmap page tables Kevin Brodsky
2026-05-26 11:16 ` [PATCH RFC v8 15/24] mm: kpkeys: Introduce hook for protecting static " Kevin Brodsky
2026-05-26 11:16 ` [PATCH RFC v8 16/24] arm64: kpkeys: Implement arch_supports_kpkeys_early() Kevin Brodsky
2026-05-26 11:16 ` [PATCH RFC v8 17/24] arm64: kpkeys: Support KPKEYS_CTX_PGTABLES Kevin Brodsky
2026-05-26 11:16 ` [PATCH RFC v8 18/24] arm64: kpkeys: Ensure the linear map can be modified Kevin Brodsky
2026-05-26 11:16 ` [PATCH RFC v8 19/24] arm64: kpkeys: Protect early page tables Kevin Brodsky
2026-05-26 11:16 ` [PATCH RFC v8 20/24] arm64: kpkeys: Protect init_pg_dir Kevin Brodsky
2026-05-26 11:16 ` [PATCH RFC v8 21/24] arm64: kpkeys: Guard page table writes Kevin Brodsky
2026-05-26 11:16 ` [PATCH RFC v8 22/24] arm64: kpkeys: Batch KPKEYS_CTX_PGTABLES switches Kevin Brodsky
2026-05-26 11:16 ` [PATCH RFC v8 23/24] arm64: kpkeys: Enable kpkeys_hardened_pgtables support Kevin Brodsky
2026-05-26 11:16 ` [PATCH RFC v8 24/24] mm: Add basic tests for kpkeys_hardened_pgtables Kevin Brodsky
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