From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id C0E9D37DE89 for ; Fri, 3 Jul 2026 11:42:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783078946; cv=none; b=a7tCbeyfO1/SftVo+xCHyyO1CvGb+TcTZm+rKXvGfupfwfIr1jq5GrF5mqnz+M/pWVPFZ8DymshHikZWYAKIUaP5VF2IZbXAubEU7p9ALwmYU/Tj6G71zjzG1zcypkH3/sZWjs+YbWwxqASHmUqsTjCVrK8z9+3NkPNeRwRrkrA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783078946; c=relaxed/simple; bh=gjAG24FmQiHMD3ERiShpuM0M9pe6oRmukL9/yTrH5G4=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=D+mJf/VpgnYqmX+MjZVTLU5Nu2FP+mJK5xOTSesMCoY3+DNuSfa94ZU8UXjRFAmnLcSPMWyZ7oQSLTVuVI07rmEl7Kv8dOOWax0f454Z5f3l6TIL1vlIQD2GWo80+FBDE2jRS69EVxVi1RTqCEVKDxijnU8TaoD/dmEeMRUTE0A= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b=tU7XRuHL; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b="tU7XRuHL" Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 85C691F91; Fri, 3 Jul 2026 04:42:19 -0700 (PDT) Received: from cesw-amp-gbt-1s-m12830-01.blr.arm.com (cesw-amp-gbt-1s-m12830-01.blr.arm.com [10.164.195.31]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 9D32C3F673; Fri, 3 Jul 2026 04:42:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1783078943; bh=gjAG24FmQiHMD3ERiShpuM0M9pe6oRmukL9/yTrH5G4=; h=From:To:Cc:Subject:Date:From; b=tU7XRuHLJ8qyLSmm0z3GT/NObLP7sbopONklJMUamJbe4XQiIsNTvQhhwaMeM5nvW UfcASUHl08SMUxPmqsVcp+LGj79dgKL8jhPQuukkEy0RhyyW6gwnpfScCLO6l9KK/M JJVfz/sfLE7mngUB217h6HcadLLuV+4raCBnC6cM= From: Dev Jain To: muchun.song@linux.dev, osalvador@suse.de, akpm@linux-foundation.org, ljs@kernel.org, david@kernel.org, liam@infradead.org Cc: Dev Jain , riel@surriel.com, vbabka@kernel.org, harry@kernel.org, jannh@google.com, lance.yang@linux.dev, kas@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, apopple@nvidia.com, rcampbell@nvidia.com, ziy@nvidia.com, matthew.brost@intel.com, joshua.hahnjy@gmail.com, rakie.kim@sk.com, byungchul@sk.com, gourry@gourry.net, ying.huang@linux.alibaba.com, ak@linux.intel.com, nao.horiguchi@gmail.com, mel@csn.ul.ie, j-nomura@ce.jp.nec.com, pfalcato@suse.de, tglx@kernel.org, dave.hansen@intel.com, jpoimboe@kernel.org, catalin.marinas@arm.com, will@kernel.org, linux-arm-kernel@lists.infradead.org, ryan.roberts@arm.com, anshuman.khandual@arm.com Subject: [PATCH v3 0/6] Fix incorrect access of hugetlb pte entries Date: Fri, 3 Jul 2026 11:41:53 +0000 Message-ID: <20260703114202.365553-1-dev.jain@arm.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit There are various places which use ptep_get() to get the pte entry corresponding to a hugetlb folio. Some arches (like s390) have special handling to compute the pteval, so they provide huge_ptep_get(). Use this helper consistently. Additionally, some code paths may provide huge_ptep_get with an unaligned address. This is a problem on arm64 (I checked other arches and it looks fine for them), which is fixed in patch 1. The fix is made to be backport-friendly: the cleaner fix would be to perhaps pass the hstate to huge_ptep_get() - that is wider churn and we can do that later. --- v2->v3: - Place comment at appropriate place in patches 2 and 3 - Modify indentation in patch 2, patch 6 v1->v2: - Add patch 1 - Mention s390 in cover letter Dev Jain (6): arm64: make huge_ptep_get handled unaligned addresses mm/rmap: use huge_ptep_get() in try_to_unmap_one() mm/rmap: use huge_ptep_get() in try_to_migrate_one() mm/migrate: use huge_ptep_get() in remove_migration_pte() mm/page_vma_mapped: use huge_ptep_get() for hugetlb mm/mprotect: use huge_ptep_get() for hugetlb arch/arm64/mm/hugetlbpage.c | 2 +- include/linux/hugetlb.h | 2 ++ mm/migrate.c | 6 +++++- mm/mprotect.c | 12 +++++++++--- mm/page_vma_mapped.c | 8 +++++++- mm/rmap.c | 32 ++++++++++++++++++++------------ 6 files changed, 44 insertions(+), 18 deletions(-) -- 2.43.0