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Thu, 27 May 2021 23:12:36 +0000 From: Mike Kravetz To: Linux-MM , lkml Cc: Muchun Song , Michal Hocko , Oscar Salvador , David Hildenbrand , Naoya Horiguchi , Andrew Morton , Mike Kravetz Subject: [PATCH] mm: hugetlb: fix dissolve_free_huge_page use of tail/head page Date: Thu, 27 May 2021 16:12:25 -0700 Message-Id: <20210527231225.226987-1-mike.kravetz@oracle.com> X-Mailer: git-send-email 2.31.1 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [50.38.35.18] X-ClientProxiedBy: MW4P220CA0002.NAMP220.PROD.OUTLOOK.COM (2603:10b6:303:115::7) To BY5PR10MB4196.namprd10.prod.outlook.com (2603:10b6:a03:20d::23) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from monkey.oracle.com (50.38.35.18) by MW4P220CA0002.NAMP220.PROD.OUTLOOK.COM (2603:10b6:303:115::7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4173.20 via Frontend Transport; Thu, 27 May 2021 23:12:35 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 33a64d04-ab32-42c9-cc35-08d92164ea1b X-MS-TrafficTypeDiagnostic: BYAPR10MB3000: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:6108; 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The tail page is incorrectly passed on to the routines alloc_huge_page_vmemmap and add_hugetlb_page which expect a hugetlb head page. Operating on a tail page instead of head page could result in addressing exceptions or vmemmap corruption. Signed-off-by: Mike Kravetz --- The code with this issue is only in mmotm (and next). Specifically mm: hugetlb: alloc the vmemmap pages associated with each HugeTLB page Andrew, I assume you will fix in your tree. mm/hugetlb.c | 4 ++-- scripts/rust-version.sh | 0 2 files changed, 2 insertions(+), 2 deletions(-) mode change 100644 => 100755 scripts/rust-version.sh diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 69a4b551c157..d2461c1f32dd 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -1954,7 +1954,7 @@ int dissolve_free_huge_page(struct page *page) * Attempt to allocate vmemmmap here so that we can take * appropriate action on failure. */ - rc = alloc_huge_page_vmemmap(h, page); + rc = alloc_huge_page_vmemmap(h, head); if (!rc) { /* * Move PageHWPoison flag from head page to the raw @@ -1968,7 +1968,7 @@ int dissolve_free_huge_page(struct page *page) update_and_free_page(h, head, false); } else { spin_lock_irq(&hugetlb_lock); - add_hugetlb_page(h, page, false); + add_hugetlb_page(h, head, false); h->max_huge_pages++; spin_unlock_irq(&hugetlb_lock); } diff --git a/scripts/rust-version.sh b/scripts/rust-version.sh old mode 100644 new mode 100755 -- 2.31.1