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Tue, 25 Aug 2026 20:21:25 +0800 (CST) Received: from huawei.com (10.44.142.85) by kwepemo200010.china.huawei.com (7.202.195.178) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.45; Tue, 25 Aug 2026 20:21:24 +0800 From: Qi Xi To: Andrew Morton , Vlastimil Babka CC: Suren Baghdasaryan , Michal Hocko , Brendan Jackman , Johannes Weiner , Zi Yan , , , , , Subject: [PATCH v3 0/2] mm/page_isolation: fix UBSAN shift-out-of-bounds in isolate_single_pageblock Date: Tue, 25 Aug 2026 20:05:47 +0800 Message-ID: <20260825120549.966271-1-xiqi2@huawei.com> X-Mailer: git-send-email 2.33.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.44.142.85] X-ClientProxiedBy: kwepems200001.china.huawei.com (7.221.188.67) To kwepemo200010.china.huawei.com (7.202.195.178) X-Rspam-User: X-Stat-Signature: pjnpzukfseoo6tnyp3g954mubfex5r8g X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 762B720009 X-HE-Tag: 1787660493-486892 X-HE-Meta: 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 3hpMa86b CPWniuNf0wP1kHJTkkembrw8Ah7un0hLHCEmdMdno+2U70s8/9T4J3Z0sBAbDduH9/W3G4JKj9XeY6/aHvX/XYxUZDv99Wk4GjbgoYEHRPAHkUki/PO2864Jb66DOSlLvsKyWaWu18bUYrJ4e3xvyRpEb7Nk8G2EyaehjJAVwlIC5eu0W2OSrlrkYHkA5Ip1fKTb5hFnGMw1KnUs5gMa5fvz/G7QsX7fM540THEZGj6EMPeGUY8Qt1onK9Y5yvryJRupw/haWVVqvx0O3yNJgyfnbZcM77XQmVmU2LNGFr5YZgg8SN4CXWf75JZlGzO486SNx Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Patch 1 fixes a UBSAN shift-out-of-bounds warning in the PageBuddy branch of isolate_single_pageblock() triggered by concurrent buddy allocation. Patch 2 addresses the same class of issue in the PageCompound branch, where racy compound_order() and compound_head() reads could lead to out-of-range shifts or incorrect page skipping. Changes since v2: - Patch 1: add a comment clarifying pageblock_isolate_and_move_free_pages() splits cross-boundary PageBuddy. No code change. Changes since v1: - Patch 1: drop VM_WARN_ON_ONCE, bail out with -EBUSY instead - Patch 2: new patch addressing PageCompound branch race Qi Xi (2): mm/page_isolation: fix UBSAN shift-out-of-bounds warning mm/page_isolation: guard compound_order() against racing mm/page_isolation.c | 40 ++++++++++++++++++++++++++++++++-------- 1 file changed, 32 insertions(+), 8 deletions(-) -- 2.33.0