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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2023-12-17 20:27:36 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2023-12-17 20:27:36 +0300 |
| commit | 0e389834672c723435a44818ed2cabc4dad24429 (patch) | |
| tree | 851380d8e2ede50b6f2fcdff8e9a05dd2fe8c3a4 /fs/btrfs/ioctl.c | |
| parent | accc98aff5c39fdc63bf0bac471b9c601aaf4755 (diff) | |
| parent | a8892fd71933126ebae3d60aec5918d4dceaae76 (diff) | |
| download | linux-0e389834672c723435a44818ed2cabc4dad24429.tar.xz | |
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
Diffstat (limited to 'fs/btrfs/ioctl.c')
| -rw-r--r-- | fs/btrfs/ioctl.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 4e50b62db2a8..a1743904202b 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -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, |