CVE: CVE-2024-57975
Published: 2025-02-27
Description: In the Linux kernel, the following vulnerability has been resolved:

btrfs: do proper folio cleanup when run_delalloc_nocow() failed

[BUG]
With CONFIG_DEBUG_VM set, test case generic/476 has some chance to crash
with the following VM_BUG_ON_FOLIO():

  BTRFS error (device dm-3): cow_file_range failed, start 1146880 end 1253375 len 106496 ret -28
  BTRFS error (device dm-3): run_delalloc_nocow failed, start 1146880 end 1253375 len 106496 ret -28
  page: refcount:4 mapcount:0 mapping:[PII_REDACTED]2787cc index:0x12 pfn:0x10664
  aops:btrfs_aops [btrfs] ino:101 dentry name(?):"f1774"
  flags: 0x2fffff80004028(uptodate|lru|private|node=0|zone=2|lastcpupid=0xfffff)
  page dumped because: VM_BUG_ON_FOLIO(!folio_test_locked(folio))
  ------------[ cut here ]------------
  kernel BUG at mm/page-writeback.c:2992!
  Internal error: Oops - BUG: 00000000f2000800 [#1] SMP
  CPU: 2 UID: 0 PID: 3943513 Comm: kworker/u24:15 Tainted: G           OE      6.12.0-rc7-custom+ #87
  Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODULE
  Hardware name: QEMU KVM Virtual Machine, BIOS unknown 2/2/2022
  Workqueue: events_unbound btrfs_async_reclaim_data_space [btrfs]
  pc : folio_clear_dirty_for_io+0x128/0x258
  lr : folio_clear_dirty_for_io+0x128/0x258
  Call trace:
   folio_clear_dirty_for_io+0x128/0x258
   btrfs_folio_clamp_clear_dirty+0x80/0xd0 [btrfs]
   __process_folios_contig+0x154/0x268 [btrfs]
   extent_clear_unlock_delalloc+0x5c/0x80 [btrfs]
   run_delalloc_nocow+0x5f8/0x760 [btrfs]
   btrfs_run_delalloc_range+0xa8/0x220 [btrfs]
   writepage_delalloc+0x230/0x4c8 [btrfs]
   extent_writepage+0xb8/0x358 [btrfs]
   extent_write_cache_pages+0x21c/0x4e8 [btrfs]
   btrfs_writepages+0x94/0x150 [btrfs]
   do_writepages+0x74/0x190
   filemap_fdatawrite_wbc+0x88/0xc8
   start_delalloc_inodes+0x178/0x3a8 [btrfs]
   btrfs_start_delalloc_roots+0x174/0x280 [btrfs]
   shrink_delalloc+0x114/0x280 [btrfs]
   flush_space+0x250/0x2f8 [btrfs]
   btrfs_async_reclaim_data_space+0x180/0x228 [btrfs]
   process_one_work+0x164/0x408
   worker_thread+0x25c/0x388
   kthread+0x100/0x118
   ret_from_fork+0x10/0x20
  Code: 910a8021 a90363f7 a9046bf9 94012379 (d4210000)
  ---[ end trace [PII_REDACTED] ]---

[CAUSE]
The first two lines of extra debug messages show the problem is caused
by the error handling of run_delalloc_nocow().

E.g. we have the following dirtied range (4K blocksize 4K page size):

    0                 16K                  32K
    |//////////////////////////////////////|
    |  Pre-allocated  |

And the range [0, 16K) has a preallocated extent.

- Enter run_delalloc_nocow() for range [0, 16K)
  Which found range [0, 16K) is preallocated, can do the proper NOCOW
  write.

- Enter fallback_to_fow() for range [16K, 32K)
  Since the range [16K, 32K) is not backed by preallocated extent, we
  have to go COW.

- cow_file_range() failed for range [16K, 32K)
  So cow_file_range() will do the clean up by clearing folio dirty,
  unlock the folios.

  Now the folios in range [16K, 32K) is unlocked.

- Enter extent_clear_unlock_delalloc() from run_delalloc_nocow()
  Which is called with PAGE_START_WRITEBACK to start page writeback.
  But folios can only be marked writeback when it's properly locked,
  thus this triggered the VM_BUG_ON_FOLIO().

Furthermore there is another hidden but common bug that
run_delalloc_nocow() is not clearing the folio dirty flags in its error
handling path.
This is the common bug shared between run_delalloc_nocow() and
cow_file_range().

[FIX]
- Clear folio dirty for range [@start, @cur_offset)
  Introduce a helper, cleanup_dirty_folios(), which
  will find and lock the folio in the range, clear the dirty flag and
  start/end the writeback, with the extra handling for the
  @locked_folio.

- Introduce a helper to clear folio dirty, start and end writeback

- Introduce a helper to record the last failed COW range end
  This is to trace which range we should skip, to avoid double
  unlocking.

- Skip the failed COW range for the e
---truncated---
CVSS Score: 5.5 (MEDIUM)
CWE: CWE-459
References: https://git.kernel.org/stable/c/2434533f1c963e7317c45880c98287e5bed98325; https://git.kernel.org/stable/c/5ae72abbf91eb172ce3a838a4dc34be3c9707296; https://git.kernel.org/stable/c/c2b47df81c8e20a8e8cd94f0d7df211137ae94ed