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Merge tag 'pull-rename' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

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Pull rename updates from Al Viro:
 "Fix directory locking scheme on rename

  This was broken in 6.5; we really can't lock two unrelated directories
  without holding ->s_vfs_rename_mutex first and in case of same-parent
  rename of a subdirectory 6.5 ends up doing just that"

* tag 'pull-rename' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  rename(): avoid a deadlock in the case of parents having no common ancestor
  kill lock_two_inodes()
  rename(): fix the locking of subdirectories
  f2fs: Avoid reading renamed directory if parent does not change
  ext4: don't access the source subdirectory content on same-directory rename
  ext2: Avoid reading renamed directory if parent does not change
  udf_rename(): only access the child content on cross-directory rename
  ocfs2: Avoid touching renamed directory if parent does not change
  reiserfs: Avoid touching renamed directory if parent does not change
This commit is contained in:
Linus Torvalds
2024-01-11 20:00:22 -08:00
parent 2f444347a8 a8b0026847
commit bf4e7080ae
20 changed files with 428 additions and 218 deletions
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7
fs/overlayfs/util.c
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@@ -1198,12 +1198,17 @@ void ovl_nlink_end(struct dentry *dentry)
int ovl_lock_rename_workdir(struct dentry *workdir, struct dentry *upperdir)
{
struct dentry *trap;
/* Workdir should not be the same as upperdir */
if (workdir == upperdir)
goto err;
/* Workdir should not be subdir of upperdir and vice versa */
if (lock_rename(workdir, upperdir) != NULL)
trap = lock_rename(workdir, upperdir);
if (IS_ERR(trap))
goto err;
if (trap)
goto err_unlock;
return 0;