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Sat, 05 Sep 2026 12:29:55 -0700 (PDT) Received: from localhost ([2600:1702:7a90:6f9f:8bc4:8aec:108d:7a04]) by smtp.gmail.com with ESMTPSA id 956f58d0204a3-66fb4912962sm4885271d50.12.2026.09.05.12.29.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 05 Sep 2026 12:29:53 -0700 (PDT) From: Matt Turner Date: Sat, 05 Sep 2026 15:29:34 -0400 Subject: [PATCH v2 13/22] alpha: add ARCH_SUPPORTS_PAGE_TABLE_CHECK support Precedence: bulk X-Mailing-List: linux-alpha@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260905-arch-kconfig-options-v2-v2-13-83e8245761a2@gmail.com> References: <20260905-arch-kconfig-options-v2-v2-0-83e8245761a2@gmail.com> In-Reply-To: <20260905-arch-kconfig-options-v2-v2-0-83e8245761a2@gmail.com> To: Richard Henderson , Magnus Lindholm , Kees Cook , Marco Elver , Andrey Konovalov , Andrey Ryabinin , Jonathan Corbet , Shuah Khan , Randy Dunlap Cc: linux-alpha@vger.kernel.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, linux-hardening@vger.kernel.org, linux-doc@vger.kernel.org, Matt Turner X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=2479; i=mattst88@gmail.com; h=from:subject:message-id; bh=tQCCNsza3+L/Dp26uPQrzzZj2N7hYv0TPiV2LTjFJ8k=; b=owGbwMvMwCW25rVmCc8sv+mMp9WSGLLm5E7xnPBi46/F3/zEn7dEp54KiisyZeNXdFWc/MVO8 MdFj8bMjo8sDGJcDDPFFFni1iuyzGrbsdTntPQvmDmsTCBDpEUaGICAhYEvNzGv1EjHSM9U21DP EMjQMYqHyOkxaGQWF5emFummFRQ55OWXJJZk5ucV6+UXpOYVpBfopWWmlWRk5BcVpwKN0MtLLTF 1dXQzMjQwsXS0MHOycDQ1cXZ2MnRyc3R0dnUysjQ3MXC2dDRxtTRn4OIUgLlmyhqG/9nadzaZbZ i3+pqOdFrj92sm5zLO3X5V+FTfT0Ck9pKN9zlGhg8znDxvflz080rfn7839BffN775WWxX9RPTi +89bBmY9nACAA== X-Developer-Key: i=mattst88@gmail.com; a=openpgp; fpr=3BB639E56F861FA2E86505690FDD682D974CA72A Add the page table check helpers needed for CONFIG_PAGE_TABLE_CHECK and select ARCH_SUPPORTS_PAGE_TABLE_CHECK in Kconfig. Alpha does not support huge pages, so pmd_user_accessible_page() and pud_user_accessible_page() always return false. pte_user_accessible_page() checks for present PTEs with user read access (_PAGE_URE). Assisted-by: Claude:claude-opus-4-6 Signed-off-by: Matt Turner Update the helpers to the three-argument pxx_user_accessible_page(mm, addr, pxx) signature introduced by commit cf8771ca4cdb ("mm/page_table_check: Pass mm_struct to pxx_user_accessible_page()"), matching the other architectures. --- arch/alpha/Kconfig | 1 + arch/alpha/include/asm/pgtable.h | 19 +++++++++++++++++++ 2 files changed, 20 insertions(+) diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig index 1d28fa8d3b66..da4ec8399517 100644 --- a/arch/alpha/Kconfig +++ b/arch/alpha/Kconfig @@ -19,6 +19,7 @@ config ALPHA select ARCH_NO_SG_CHAIN select ARCH_SUPPORTS_ATOMIC_RMW select ARCH_SUPPORTS_INT128 if CC_HAS_INT128 + select ARCH_SUPPORTS_PAGE_TABLE_CHECK select ARCH_USE_CMPXCHG_LOCKREF select FORCE_PCI select PCI_DOMAINS if PCI diff --git a/arch/alpha/include/asm/pgtable.h b/arch/alpha/include/asm/pgtable.h index bdff33b505bc..6ebdd90f3035 100644 --- a/arch/alpha/include/asm/pgtable.h +++ b/arch/alpha/include/asm/pgtable.h @@ -232,6 +232,25 @@ extern inline void pud_clear(pud_t * pudp) { pud_val(*pudp) = 0; } extern inline int pte_write(pte_t pte) { return !(pte_val(pte) & _PAGE_FOW); } extern inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; } extern inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } +extern inline int pte_user(pte_t pte) { return pte_val(pte) & _PAGE_URE; } + +static inline bool pte_user_accessible_page(struct mm_struct *mm, + unsigned long addr, pte_t pte) +{ + return pte_present(pte) && pte_user(pte); +} + +static inline bool pmd_user_accessible_page(struct mm_struct *mm, + unsigned long addr, pmd_t pmd) +{ + return false; +} + +static inline bool pud_user_accessible_page(struct mm_struct *mm, + unsigned long addr, pud_t pud) +{ + return false; +} extern inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) |= _PAGE_FOW; return pte; } extern inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~(__DIRTY_BITS); return pte; } -- 2.54.0