Description
In the Linux kernel, the following vulnerability has been resolved: f2fs: compress: fix to call f2fs_wait_on_page_writeback() in f2fs_write_raw_pages() BUG_ON() will be triggered when writing files concurrently, because the same page is writtenback multiple times. 1597 void folio_end_writeback(struct folio *folio) 1598 { ...... 1618 if (!__folio_end_writeback(folio)) 1619 BUG(); ...... 1625 } kernel BUG at mm/filemap.c:1619! Call Trace: <TASK> f2fs_write_end_io+0x1a0/0x370 blk_update_request+0x6c/0x410 blk_mq_end_request+0x15/0x130 blk_complete_reqs+0x3c/0x50 __do_softirq+0xb8/0x29b ? sort_range+0x20/0x20 run_ksoftirqd+0x19/0x20 smpboot_thread_fn+0x10b/0x1d0 kthread+0xde/0x110 ? kthread_complete_and_exit+0x20/0x20 ret_from_fork+0x22/0x30 </TASK> Below is the concurrency scenario: [Process A] [Process B] [Process C] f2fs_write_raw_pages() - redirty_page_for_writepage() - unlock page() f2fs_do_write_data_page() - lock_page() - clear_page_dirty_for_io() - set_page_writeback() [1st writeback] ..... - unlock page() generic_perform_write() - f2fs_write_begin() - wait_for_stable_page() - f2fs_write_end() - set_page_dirty() - lock_page() - f2fs_do_write_data_page() - set_page_writeback() [2st writeback] This problem was introduced by the previous commit 7377e853967b ("f2fs: compress: fix potential deadlock of compress file"). All pagelocks were released in f2fs_write_raw_pages(), but whether the page was in the writeback state was ignored in the subsequent writing process. Let's fix it by waiting for the page to writeback before writing.
Product status
4c8ff7095bef64fc47e996a938f7d57f9e077da3 (git) before a8226a45b2a9ce83ba7a167a387a00fecc319e71
4c8ff7095bef64fc47e996a938f7d57f9e077da3 (git) before 169134da419cb8ffbe3b0743bc24573e16952ea9
4c8ff7095bef64fc47e996a938f7d57f9e077da3 (git) before 6604df2a9d07ba8f8fb1ac14046c2c83776faa4f
4c8ff7095bef64fc47e996a938f7d57f9e077da3 (git) before 9940877c4fe752923a53f0f7372f2f152b6eccf0
4c8ff7095bef64fc47e996a938f7d57f9e077da3 (git) before ad31eed06c3b4d63b2d38322a271d4009aee4bb3
4c8ff7095bef64fc47e996a938f7d57f9e077da3 (git) before babedcbac164cec970872b8097401ca913a80e61
5.6
Any version before 5.6
5.10.180 (semver)
5.15.111 (semver)
6.1.28 (semver)
6.2.15 (semver)
6.3.2 (semver)
6.4 (original_commit_for_fix)
References
git.kernel.org/...c/a8226a45b2a9ce83ba7a167a387a00fecc319e71
git.kernel.org/...c/169134da419cb8ffbe3b0743bc24573e16952ea9
git.kernel.org/...c/6604df2a9d07ba8f8fb1ac14046c2c83776faa4f
git.kernel.org/...c/9940877c4fe752923a53f0f7372f2f152b6eccf0
git.kernel.org/...c/ad31eed06c3b4d63b2d38322a271d4009aee4bb3
git.kernel.org/...c/babedcbac164cec970872b8097401ca913a80e61
Data based on CVE®. Copyright © 1999-2025, The MITRE Corporation. All rights reserved.
