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  1. 17 7月, 2023 4 次提交
  3. 14 7月, 2023 2 次提交
    • Z
      ext4: Add debug message to notify user space is out of free · 963b3ef7
      由 Zhihao Cheng 提交于 
      hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7CBCS
CVE: NA

--------------------------------

Add debug message to notify user that ext4_writepages is stuck in loop
caused by ENOSPC.
Signed-off-by: NZhihao Cheng <chengzhihao1@huawei.com>
      963b3ef7
    • Z
      Revert "ext4: Stop trying writing pages if no free blocks generated" · 62405f69
      由 Zhihao Cheng 提交于 
      This reverts commit 6b84e9d9.

When ext4 runs out of space, there could be a potential data lost in
ext4_writepages:
If there are many preallocated blocks for some files, e4b bitmap is
different from block bitmap, and there are more free blocks accounted
by block bitmap.

    ext4_writepages                         P2
ext4_mb_new_blocks                  ext4_map_blocks
 ext4_mb_regular_allocator // No free bits in e4b bitmap
 ext4_mb_discard_preallocations_should_retry
  ext4_mb_discard_preallocations
   ext4_mb_discard_group_preallocations
    ext4_mb_release_inode_pa // updates e4b bitmap by pa->pa_free
     mb_free_blocks
                                     ext4_mb_new_blocks
                                      ext4_mb_regular_allocator
                                      // Got e4b bitmap's free bits
 ext4_mb_regular_allocator  // After 3 times retrying, ret ENOSPC

ext4_writepages
 mpage_map_and_submit_extent
  mpage_map_one_extent // ret ENOSPC
  if (err == -ENOSPC && EXT4_SB(sb)->s_mb_free_pending)
  // s_mb_free_pending is 0
  *give_up_on_write = true  // Abandon writeback, data lost!

Fixes: 6b84e9d9 ("ext4: Stop trying writing pages if no free ...")
Signed-off-by: NZhihao Cheng <chengzhihao1@huawei.com>
      62405f69
  5. 13 7月, 2023 3 次提交
  7. 12 7月, 2023 3 次提交
  9. 11 7月, 2023 3 次提交
    • Z
      jbd2: Check 'jh->b_transaction' before remove it from checkpoint · a49943e0
      由 Zhihao Cheng 提交于 
      hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I70WHL
CVE: NA

--------------------------------

Following process will corrupt ext4 image:
Step 1:
jbd2_journal_commit_transaction
 __jbd2_journal_insert_checkpoint(jh, commit_transaction)
 // Put jh into trans1->t_checkpoint_list
 journal->j_checkpoint_transactions = commit_transaction
 // Put trans1 into journal->j_checkpoint_transactions

Step 2:
do_get_write_access
 test_clear_buffer_dirty(bh) // clear buffer dirty，set jbd dirty
 __jbd2_journal_file_buffer(jh, transaction) // jh belongs to trans2

Step 3:
drop_cache
 journal_shrink_one_cp_list
  jbd2_journal_try_remove_checkpoint
   if (!trylock_buffer(bh))  // lock bh, true
   if (buffer_dirty(bh))     // buffer is not dirty
   __jbd2_journal_remove_checkpoint(jh)
   // remove jh from trans1->t_checkpoint_list

Step 4:
jbd2_log_do_checkpoint
 trans1 = journal->j_checkpoint_transactions
 // jh is not in trans1->t_checkpoint_list
 jbd2_cleanup_journal_tail(journal)  // trans1 is done

Step 5: Power cut, trans2 is not committed, jh is lost in next mounting.

Fix it by checking 'jh->b_transaction' before remove it from checkpoint.

Fixes: 80079353 ("jbd2: fix a race when checking checkpoint ...")
Signed-off-by: NZhihao Cheng <chengzhihao1@huawei.com>
(cherry picked from commit 7723e91d)
      a49943e0
    • L
      etmem: fix the div 0 problem in swapcache reclaim process · 248e7033
      由 liubo 提交于 
      euleros inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7JI6K
CVE: NA

------------------------------------------------------------

In the swapcache recycling process, the number of pages
to be reclaimed on each node is obtained as follows:

nr_to_reclaim[nid_num] = (swapcache_to_reclaim /
			  (swapcache_total_reclaimable / nr[nid_num]));

However, nr[nid_num] is obtained by traversing the number
of swapcache pages on each node.
If there are multiple nodes in the environment and
no swap process occurs on a node, no swapcache page exists.
The value of nr[nid_num] may be 0.

Therefore, division by zero errors may occur.
Signed-off-by: Nliubo <liubo254@huawei.com>
      248e7033
    • O
      !1361 fix CVE-2023-1295 · cb31b5b2
      由 openeuler-ci-bot 提交于 
      Merge Pull Request from: @LiuYongQiang0816 
 
3 patches from Li Nan 
 
Link:https://gitee.com/openeuler/kernel/pulls/1361 

Reviewed-by: Zhang Changzhong <zhangchangzhong@huawei.com> 
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>
      cb31b5b2
  11. 10 7月, 2023 3 次提交
  13. 08 7月, 2023 4 次提交
  15. 07 7月, 2023 18 次提交