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[90.181.218.29]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-5c42bb5f4f1sm10472622a12.53.2024.09.23.08.56.40 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 23 Sep 2024 08:56:42 -0700 (PDT) Message-ID: <31e90b74-8bd1-4bfe-9384-8d479735d2be@redhat.com> Date: Mon, 23 Sep 2024 17:56:40 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mm: migrate: fix data-race in migrate_folio_unmap() To: Jeongjun Park , akpm@linux-foundation.org Cc: wangkefeng.wang@huawei.com, ziy@nvidia.com, willy@infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, syzbot References: <20240922151708.33949-1-aha310510@gmail.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzSREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZgEEwEIAEICGwMGCwkIBwMCBhUIAgkKCwQW AgMBAh4BAheAAhkBFiEEG9nKrXNcTDpGDfzKTd4Q9wD/g1oFAl8Ox4kFCRKpKXgACgkQTd4Q 9wD/g1oHcA//a6Tj7SBNjFNM1iNhWUo1lxAja0lpSodSnB2g4FCZ4R61SBR4l/psBL73xktp rDHrx4aSpwkRP6Epu6mLvhlfjmkRG4OynJ5HG1gfv7RJJfnUdUM1z5kdS8JBrOhMJS2c/gPf wv1TGRq2XdMPnfY2o0CxRqpcLkx4vBODvJGl2mQyJF/gPepdDfcT8/PY9BJ7FL6Hrq1gnAo4 3Iv9qV0JiT2wmZciNyYQhmA1V6dyTRiQ4YAc31zOo2IM+xisPzeSHgw3ONY/XhYvfZ9r7W1l pNQdc2G+o4Di9NPFHQQhDw3YTRR1opJaTlRDzxYxzU6ZnUUBghxt9cwUWTpfCktkMZiPSDGd KgQBjnweV2jw9UOTxjb4LXqDjmSNkjDdQUOU69jGMUXgihvo4zhYcMX8F5gWdRtMR7DzW/YE BgVcyxNkMIXoY1aYj6npHYiNQesQlqjU6azjbH70/SXKM5tNRplgW8TNprMDuntdvV9wNkFs 9TyM02V5aWxFfI42+aivc4KEw69SE9KXwC7FSf5wXzuTot97N9Phj/Z3+jx443jo2NR34XgF 89cct7wJMjOF7bBefo0fPPZQuIma0Zym71cP61OP/i11ahNye6HGKfxGCOcs5wW9kRQEk8P9 M/k2wt3mt/fCQnuP/mWutNPt95w9wSsUyATLmtNrwccz63XOwU0EVcufkQEQAOfX3n0g0fZz Bgm/S2zF/kxQKCEKP8ID+Vz8sy2GpDvveBq4H2Y34XWsT1zLJdvqPI4af4ZSMxuerWjXbVWb T6d4odQIG0fKx4F8NccDqbgHeZRNajXeeJ3R7gAzvWvQNLz4piHrO/B4tf8svmRBL0ZB5P5A 2uhdwLU3NZuK22zpNn4is87BPWF8HhY0L5fafgDMOqnf4guJVJPYNPhUFzXUbPqOKOkL8ojk CXxkOFHAbjstSK5Ca3fKquY3rdX3DNo+EL7FvAiw1mUtS+5GeYE+RMnDCsVFm/C7kY8c2d0G NWkB9pJM5+mnIoFNxy7YBcldYATVeOHoY4LyaUWNnAvFYWp08dHWfZo9WCiJMuTfgtH9tc75 7QanMVdPt6fDK8UUXIBLQ2TWr/sQKE9xtFuEmoQGlE1l6bGaDnnMLcYu+Asp3kDT0w4zYGsx 5r6XQVRH4+5N6eHZiaeYtFOujp5n+pjBaQK7wUUjDilPQ5QMzIuCL4YjVoylWiBNknvQWBXS lQCWmavOT9sttGQXdPCC5ynI+1ymZC1ORZKANLnRAb0NH/UCzcsstw2TAkFnMEbo9Zu9w7Kv AxBQXWeXhJI9XQssfrf4Gusdqx8nPEpfOqCtbbwJMATbHyqLt7/oz/5deGuwxgb65pWIzufa N7eop7uh+6bezi+rugUI+w6DABEBAAHCwXwEGAEIACYCGwwWIQQb2cqtc1xMOkYN/MpN3hD3 AP+DWgUCXw7HsgUJEqkpoQAKCRBN3hD3AP+DWrrpD/4qS3dyVRxDcDHIlmguXjC1Q5tZTwNB boaBTPHSy/Nksu0eY7x6HfQJ3xajVH32Ms6t1trDQmPx2iP5+7iDsb7OKAb5eOS8h+BEBDeq 3ecsQDv0fFJOA9ag5O3LLNk+3x3q7e0uo06XMaY7UHS341ozXUUI7wC7iKfoUTv03iO9El5f XpNMx/YrIMduZ2+nd9Di7o5+KIwlb2mAB9sTNHdMrXesX8eBL6T9b+MZJk+mZuPxKNVfEQMQ a5SxUEADIPQTPNvBewdeI80yeOCrN+Zzwy/Mrx9EPeu59Y5vSJOx/z6OUImD/GhX7Xvkt3kq Er5KTrJz3++B6SH9pum9PuoE/k+nntJkNMmQpR4MCBaV/J9gIOPGodDKnjdng+mXliF3Ptu6 3oxc2RCyGzTlxyMwuc2U5Q7KtUNTdDe8T0uE+9b8BLMVQDDfJjqY0VVqSUwImzTDLX9S4g/8 kC4HRcclk8hpyhY2jKGluZO0awwTIMgVEzmTyBphDg/Gx7dZU1Xf8HFuE+UZ5UDHDTnwgv7E th6RC9+WrhDNspZ9fJjKWRbveQgUFCpe1sa77LAw+XFrKmBHXp9ZVIe90RMe2tRL06BGiRZr jPrnvUsUUsjRoRNJjKKA/REq+sAnhkNPPZ/NNMjaZ5b8Tovi8C0tmxiCHaQYqj7G2rgnT0kt WNyWQQ== Organization: Red Hat In-Reply-To: <20240922151708.33949-1-aha310510@gmail.com> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 3B6EFC0019 X-Stat-Signature: k55uejgpagstbxjpj8gzqxmqd1bphc6n X-HE-Tag: 1727107008-810939 X-HE-Meta: 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 S0gjMRgl 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 22.09.24 17:17, Jeongjun Park wrote: > I found a report from syzbot [1] > > When __folio_test_movable() is called in migrate_folio_unmap() to read > folio->mapping, a data race occurs because the folio is read without > protecting it with folio_lock. > > This can cause unintended behavior because folio->mapping is initialized > to a NULL value. Therefore, I think it is appropriate to call > __folio_test_movable() under the protection of folio_lock to prevent > data-race. > We hold a folio reference, would we really see PAGE_MAPPING_MOVABLE flip? Hmm Even a racing __ClearPageMovable() would still leave PAGE_MAPPING_MOVABLE set. > [1] > > ================================================================== > BUG: KCSAN: data-race in __filemap_remove_folio / migrate_pages_batch > > write to 0xffffea0004b81dd8 of 8 bytes by task 6348 on cpu 0: > page_cache_delete mm/filemap.c:153 [inline] > __filemap_remove_folio+0x1ac/0x2c0 mm/filemap.c:233 > filemap_remove_folio+0x6b/0x1f0 mm/filemap.c:265 > truncate_inode_folio+0x42/0x50 mm/truncate.c:178 > shmem_undo_range+0x25b/0xa70 mm/shmem.c:1028 > shmem_truncate_range mm/shmem.c:1144 [inline] > shmem_evict_inode+0x14d/0x530 mm/shmem.c:1272 > evict+0x2f0/0x580 fs/inode.c:731 > iput_final fs/inode.c:1883 [inline] > iput+0x42a/0x5b0 fs/inode.c:1909 > dentry_unlink_inode+0x24f/0x260 fs/dcache.c:412 > __dentry_kill+0x18b/0x4c0 fs/dcache.c:615 > dput+0x5c/0xd0 fs/dcache.c:857 > __fput+0x3fb/0x6d0 fs/file_table.c:439 > ____fput+0x1c/0x30 fs/file_table.c:459 > task_work_run+0x13a/0x1a0 kernel/task_work.c:228 > resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] > exit_to_user_mode_loop kernel/entry/common.c:114 [inline] > exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] > __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] > syscall_exit_to_user_mode+0xbe/0x130 kernel/entry/common.c:218 > do_syscall_64+0xd6/0x1c0 arch/x86/entry/common.c:89 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > read to 0xffffea0004b81dd8 of 8 bytes by task 6342 on cpu 1: > __folio_test_movable include/linux/page-flags.h:699 [inline] > migrate_folio_unmap mm/migrate.c:1199 [inline] > migrate_pages_batch+0x24c/0x1940 mm/migrate.c:1797 > migrate_pages_sync mm/migrate.c:1963 [inline] > migrate_pages+0xff1/0x1820 mm/migrate.c:2072 > do_mbind mm/mempolicy.c:1390 [inline] > kernel_mbind mm/mempolicy.c:1533 [inline] > __do_sys_mbind mm/mempolicy.c:1607 [inline] > __se_sys_mbind+0xf76/0x1160 mm/mempolicy.c:1603 > __x64_sys_mbind+0x78/0x90 mm/mempolicy.c:1603 > x64_sys_call+0x2b4d/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:238 > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > value changed: 0xffff888127601078 -> 0x0000000000000000 Note that this doesn't flip PAGE_MAPPING_MOVABLE, just some unrelated bits. > > Reported-by: syzbot > Cc: stable@vger.kernel.org > Fixes: 7e2a5e5ab217 ("mm: migrate: use __folio_test_movable()") > Signed-off-by: Jeongjun Park > --- > mm/migrate.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/mm/migrate.c b/mm/migrate.c > index 923ea80ba744..e62dac12406b 100644 > --- a/mm/migrate.c > +++ b/mm/migrate.c > @@ -1118,7 +1118,7 @@ static int migrate_folio_unmap(new_folio_t get_new_folio, > int rc = -EAGAIN; > int old_page_state = 0; > struct anon_vma *anon_vma = NULL; > - bool is_lru = !__folio_test_movable(src); > + bool is_lru; > bool locked = false; > bool dst_locked = false; > > @@ -1172,6 +1172,7 @@ static int migrate_folio_unmap(new_folio_t get_new_folio, > locked = true; > if (folio_test_mlocked(src)) > old_page_state |= PAGE_WAS_MLOCKED; > + is_lru = !__folio_test_movable(src); Looks straight forward, though Acked-by: David Hildenbrand -- Cheers, David / dhildenb