| Message ID | cae5cad98220b379845813de92e37f55f69afc2b.1726720697.git.wqu@suse.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | btrfs: reject ro->rw reconfiguration if there are hard ro requirements | expand |
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index 98fa0f382480..0091f377dd4d 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -1286,6 +1286,13 @@ static int btrfs_remount_rw(struct btrfs_fs_info *fs_info) return -EINVAL; } + /* + * Re-check the options. The check inside btrfs_reconfigure() can be + * skipped to support different RO/RW flags for different subvolumes. + */ + if (!btrfs_check_options(fs_info, &fs_info->mount_opt, 0)) + return -EINVAL; + if (fs_info->fs_devices->rw_devices == 0) return -EACCES;
[BUG] Syzbot reports the following crash: BTRFS info (device loop0 state MCS): disabling free space tree BTRFS info (device loop0 state MCS): clearing compat-ro feature flag for FREE_SPACE_TREE (0x1) BTRFS info (device loop0 state MCS): clearing compat-ro feature flag for FREE_SPACE_TREE_VALID (0x2) Oops: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:backup_super_roots fs/btrfs/disk-io.c:1691 [inline] RIP: 0010:write_all_supers+0x97a/0x40f0 fs/btrfs/disk-io.c:4041 Call Trace: <TASK> btrfs_commit_transaction+0x1eae/0x3740 fs/btrfs/transaction.c:2530 btrfs_delete_free_space_tree+0x383/0x730 fs/btrfs/free-space-tree.c:1312 btrfs_start_pre_rw_mount+0xf28/0x1300 fs/btrfs/disk-io.c:3012 btrfs_remount_rw fs/btrfs/super.c:1309 [inline] btrfs_reconfigure+0xae6/0x2d40 fs/btrfs/super.c:1534 btrfs_reconfigure_for_mount fs/btrfs/super.c:2020 [inline] btrfs_get_tree_subvol fs/btrfs/super.c:2079 [inline] btrfs_get_tree+0x918/0x1920 fs/btrfs/super.c:2115 vfs_get_tree+0x90/0x2b0 fs/super.c:1800 do_new_mount+0x2be/0xb40 fs/namespace.c:3472 do_mount fs/namespace.c:3812 [inline] __do_sys_mount fs/namespace.c:4020 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3997 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f [CAUSE] To support mounting different subvolume with different RO/RW flags for the new mount APIs, btrfs introduced two small hack to support this feature: - Skip mount option/feature checks if we are mounting a different subvolume - Reconfigure the fs to RW if the initial mount is RO Combining this two, we can have the following sequence: - Mount the fs ro,rescue=all,clear_cache,space_cache=v1 rescue=all will mark the fs as hard read-only, and no extra work will be done to convert the original fs to v1 cache. - Mount a subvolume rw of the same fs. We go into btrfs_get_tree_subvol(), but fc_mount() returns EBUSY because our new fc is RW. Now we enter btrfs_reconfigure_for_mount(), which switch the RO flag first so that we can grab the existing fs_info. Then we reconfigure the fs to RW. - During reconfiguration, option/features check is skipped This means we will restart the v2 cache clearing, and convert back to v1 cache. This will trigger fs writes, and since the original fs has "rescue=all" option, it skips the csum tree read. And eventually causing NULL pointer dereference in super block writeback. [FIX] Inside btrfs_remount_rw(), re-do the btrfs_check_options() to make sure there is no hard read-only requirements before reconfiguring the fs to RW. Reported-by: syzbot+56360f93efa90ff15870@syzkaller.appspotmail.com Link: https://lore.kernel.org/linux-btrfs/0000000000008c5d090621cb2770@google.com/ Signed-off-by: Qu Wenruo <wqu@suse.com> --- fs/btrfs/super.c | 7 +++++++ 1 file changed, 7 insertions(+)