CVE-2025-71183

In the Linux kernel, the following vulnerability has been resolved:

btrfs: always detect conflicting inodes when logging inode refs

After rename exchanging (either with the rename exchange operation or

regular renames in multiple non-atomic steps) two inodes and at least

one of them is a directory, we can end up with a log tree that contains

only of the inodes and after a power failure that can result in an attempt

to delete the other inode when it should not because it was not deleted

before the power failure. In some case that delete attempt fails when

the target inode is a directory that contains a subvolume inside it, since

the log replay code is not prepared to deal with directory entries that

point to root items (only inode items).

1) We have directories "dir1" (inode A) and "dir2" (inode B) under the

same parent directory;

2) We have a file (inode C) under directory "dir1" (inode A);

3) We have a subvolume inside directory "dir2" (inode B);

4) All these inodes were persisted in a past transaction and we are

currently at transaction N;

5) We rename the file (inode C), so at btrfs_log_new_name() we update

inode C's last_unlink_trans to N;

6) We get a rename exchange for "dir1" (inode A) and "dir2" (inode B),

so after the exchange "dir1" is inode B and "dir2" is inode A.

During the rename exchange we call btrfs_log_new_name() for inodes

A and B, but because they are directories, we don't update their

last_unlink_trans to N;

7) An fsync against the file (inode C) is done, and because its inode

has a last_unlink_trans with a value of N we log its parent directory

(inode A) (through btrfs_log_all_parents(), called from

btrfs_log_inode_parent()).

8) So we end up with inode B not logged, which now has the old name

of inode A. At copy_inode_items_to_log(), when logging inode A, we

did not check if we had any conflicting inode to log because inode

A has a generation lower than the current transaction (created in

a past transaction);

9) After a power failure, when replaying the log tree, since we find that

inode A has a new name that conflicts with the name of inode B in the

fs tree, we attempt to delete inode B... this is wrong since that

directory was never deleted before the power failure, and because there

is a subvolume inside that directory, attempting to delete it will fail

since replay_dir_deletes() and btrfs_unlink_inode() are not prepared

to deal with dir items that point to roots instead of inodes.

When that happens the mount fails and we get a stack trace like the

following:

[87.2314] BTRFS info (device dm-0): start tree-log replay

[87.2318] BTRFS critical (device dm-0): failed to delete reference to subvol, root 5 inode 256 parent 259

[87.2332] ------------[ cut here ]------------

[87.2338] BTRFS: Transaction aborted (error -2)

[87.2346] WARNING: CPU: 1 PID: 638968 at fs/btrfs/inode.c:4345 __btrfs_unlink_inode+0x416/0x440 [btrfs]

[87.2368] Modules linked in: btrfs loop dm_thin_pool (...)

[87.2470] CPU: 1 UID: 0 PID: 638968 Comm: mount Tainted: G W 6.18.0-rc7-btrfs-next-218+ #2 PREEMPT(full)

[87.2489] Tainted: [W]=WARN

[87.2494] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.2-0-gea1b7a073390-prebuilt.qemu.org 04/01/2014

[87.2514] RIP: 0010:__btrfs_unlink_inode+0x416/0x440 [btrfs]

[87.2538] Code: c0 89 04 24 (...)

[87.2568] RSP: 0018:ffffc0e741f4b9b8 EFLAGS: 00010286

[87.2574] RAX: 0000000000000000 RBX: ffff9d3ec8a6cf60 RCX: 0000000000000000

[87.2582] RDX: 0000000000000002 RSI: ffffffff84ab45a1 RDI: 00000000ffffffff

[87.2591] RBP: ffff9d3ec8a6ef20 R08: 0000000000000000 R09: ffffc0e741f4b840

[87.2599] R10: ffff9d45dc1fffa8 R11: 0000000000000003 R12: ffff9d3ee26d77e0

[87.2608] R13: ffffc0e741f4ba98 R14: ffff9d4458040800 R15: ffff9d44b6b7ca10

[87.2618] FS: 00007f7b9603a840(0000) GS:ffff9d4658982000(0000) knlGS:0000000000000000

[87.

---truncated---