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for-6.7-rc5-tag

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Merge tag 'for-6.7-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux

Pull btrfs fix from David Sterba:
 "One more fix that verifies that the snapshot source is a root, same
  check is also done in user space but should be done by the ioctl as
  well"

* tag 'for-6.7-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
  btrfs: do not allow non subvolume root targets for snapshot
This commit is contained in:
Linus Torvalds 2023-12-17 09:27:36 -08:00
commit 0e38983467
1 changed files with 9 additions and 0 deletions
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9
fs/btrfs/ioctl.c
View file

@ -1290,6 +1290,15 @@ static noinline int __btrfs_ioctl_snap_create(struct file *file,
* are limited to own subvolumes only
*/
ret = -EPERM;
} else if (btrfs_ino(BTRFS_I(src_inode)) != BTRFS_FIRST_FREE_OBJECTID) {
/*
* Snapshots must be made with the src_inode referring
* to the subvolume inode, otherwise the permission
* checking above is useless because we may have
* permission on a lower directory but not the subvol
* itself.
*/
ret = -EINVAL;
} else {
ret = btrfs_mksnapshot(&file->f_path, idmap,
name, namelen,