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b=KwGf57n+IdbnSA897QNUk9FhDl35OB3Kr0WdR+I9Mzbe3v4qTt3YJfgqGDgLiJMAB r29pxm8iMC+2ftYzjas6w3kIuA2X1WdZpFBl70KY3k70BgHZ13kOef7qLy8hYMydlR +weneF/AeXum482c1y/aCaC6XHpvbVW6w8rvBg7S+nj2m5ll/YDK3JzIuA9TE0/01u GtO3yAGLNy14yqF6Ne1U6ZPS5tJvZKuWF0JOfvRxTyWWq5meJPDEUW5Vq6EUi5TW0I 9+yFtGraxcTbfWi+qnYgORUzIEkhSOCdw7uOUN3fsZ5yEfqmWJnCYyQVXGQLhnz6wu GDBJK7TqukpvQ== Message-ID: <455e9728-33c5-44c0-84ef-d6b764c6d9db@kernel.org> Date: Fri, 6 Nov 2026 13:40:58 +0100 X-Archived-By: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mm/ksm: avoid unsafe anon rmap dereference in KSM merge To: "Lorenzo Stoakes (ARM)" , Zhao Gongyi Cc: Xu Xin , Chengming Zhou , Andrew Morton , Rik van Riel , linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20261102-ksm-anon-rmap-fix-v1-1-68962acfb59b@kernel.org> <179387163181.11797.15205182972949028650.b4-ty@b4> <75926835-508f-48d3-a5d9-176cea61546d@bytedance.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Stat-Signature: jcixse9zp43xtcasopym5n1ttj8yh5wq X-Rspam-User: X-Spam-Status: No, score=-12.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,MAILING_LIST_MULTI,SPF_HELO_PASS,SPF_PASS, USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=4.0.1 X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 229561A0008 X-HE-Tag: 1793968868-395678 X-HE-Meta: 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 9ZIYJeJl vUI1CmWiOEk+hCO1PbBEEUF+tv6MSR4mGPIP9hJ4dmxfiHqwqHA8LZfr82CPGr1KSMdY5MM0LTAZNEP9YE5nuph8xISmHGbHRUt7F4NDQmCOfUwuM7UNHERizA+q+FV+MYe0jf0JJseiiZA3AxERd8HrC3PYxiFCtlUiP2AQkB49P5HT4qwe8OYp5anlU9B6AEiRuC7mlns9VWzw3DfJDBDOwWQOgeVJNwjPO5fR/ltnhGcvpp+BPfqUMdiLx3RQ6oGF454p4uqVT+9q+W0ngqAPlsg== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On 11/6/26 11:06, Lorenzo Stoakes (ARM) wrote: > On Fri, Nov 06, 2026 at 10:43:45AM +0800, Zhao Gongyi wrote: >> I tested Lorenzo's posted patch on Linux 7.3.0-syz-13001714+ >> with CONFIG_KSM=y, CONFIG_KASAN=y and CONFIG_SLUB_RCU_DEBUG=y. >> >> An earlier unpatched run of the fixed-pool KSM/mremap reproducer hit a >> KASAN slab-use-after-free in page_address_in_vma() after about 342 seconds. >> With the patch applied, the workload ran for 12 minutes (1027 KSM full >> scans) without KASAN, BUG or panic. The fork/COW smoke test passed. >> >> ksm_functional_tests reported 8 passes, 1 failure and 1 skip. The >> "ptrace write failed" failure is a known test-environment issue; dmesg >> showed no kernel error. >> >> Tested-by: Zhao Gongyi > > Thanks! Indeed, appreciated! -- Cheers, David