CVE-2024-57806

Опубликовано: 11 янв. 2025

Источник: redhat

CVSS3: 5.5

EPSS Низкий

Описание

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix transaction atomicity bug when enabling simple quotas Set squota incompat bit before committing the transaction that enables the feature. With the config CONFIG_BTRFS_ASSERT enabled, an assertion failure occurs regarding the simple quota feature. [5.596534] assertion failed: btrfs_fs_incompat(fs_info, SIMPLE_QUOTA), in fs/btrfs/qgroup.c:365 [5.597098] ------------[ cut here ]------------ [5.597371] kernel BUG at fs/btrfs/qgroup.c:365! [5.597946] CPU: 1 UID: 0 PID: 268 Comm: mount Not tainted 6.13.0-rc2-00031-gf92f4749861b #146 [5.598450] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 [5.599008] RIP: 0010:btrfs_read_qgroup_config+0x74d/0x7a0 [5.604303] [5.605230] ? btrfs_read_qgroup_config+0x74d/0x7a0 [5.605538] ? exc_invalid_op+0x56/0x70 [5.605775] ? btrfs_read_qgroup_config+0x74d/0x7a0 [5.606066] ? asm_exc_invalid_op+0x1f/0x30 [5.606441] ? btrfs_read_qgroup_config+0x74d/0x7a0 [5.606741] ? btrfs_read_qgroup_config+0x74d/0x7a0 [5.607038] ? try_to_wake_up+0x317/0x760 [5.607286] open_ctree+0xd9c/0x1710 [5.607509] btrfs_get_tree+0x58a/0x7e0 [5.608002] vfs_get_tree+0x2e/0x100 [5.608224] fc_mount+0x16/0x60 [5.608420] btrfs_get_tree+0x2f8/0x7e0 [5.608897] vfs_get_tree+0x2e/0x100 [5.609121] path_mount+0x4c8/0xbc0 [5.609538] __x64_sys_mount+0x10d/0x150 The issue can be easily reproduced using the following reproducer: root@q:linux# cat repro.sh set -e mkfs.btrfs -q -f /dev/sdb mount /dev/sdb /mnt/btrfs btrfs quota enable -s /mnt/btrfs umount /mnt/btrfs mount /dev/sdb /mnt/btrfs The issue is that when enabling quotas, at btrfs_quota_enable(), we set BTRFS_QGROUP_STATUS_FLAG_SIMPLE_MODE at fs_info->qgroup_flags and persist it in the quota root in the item with the key BTRFS_QGROUP_STATUS_KEY, but we only set the incompat bit BTRFS_FEATURE_INCOMPAT_SIMPLE_QUOTA after we commit the transaction used to enable simple quotas. This means that if after that transaction commit we unmount the filesystem without starting and committing any other transaction, or we have a power failure, the next time we mount the filesystem we will find the flag BTRFS_QGROUP_STATUS_FLAG_SIMPLE_MODE set in the item with the key BTRFS_QGROUP_STATUS_KEY but we will not find the incompat bit BTRFS_FEATURE_INCOMPAT_SIMPLE_QUOTA set in the superblock, triggering an assertion failure at: btrfs_read_qgroup_config() -> qgroup_read_enable_gen() To fix this issue, set the BTRFS_FEATURE_INCOMPAT_SIMPLE_QUOTA flag immediately after setting the BTRFS_QGROUP_STATUS_FLAG_SIMPLE_MODE. This ensures that both flags are flushed to disk within the same transaction.

Затронутые пакеты

Платформа	Пакет	Состояние
Red Hat Enterprise Linux 6	kernel	Not affected
Red Hat Enterprise Linux 7	kernel	Out of support scope
Red Hat Enterprise Linux 7	kernel-rt	Out of support scope
Red Hat Enterprise Linux 8	kernel	Not affected
Red Hat Enterprise Linux 8	kernel-rt	Not affected
Red Hat Enterprise Linux 9	kernel	Not affected
Red Hat Enterprise Linux 9	kernel-rt	Not affected

Показывать по

Ссылки на источники

Дополнительная информация

Статус:

Moderate

Дефект:

CWE-99

https://bugzilla.redhat.com/show_bug.cgi?id=2337291kernel: btrfs: fix transaction atomicity bug when enabling simple quotas

EPSS

Процентиль: 9%

0.00035

Низкий

5.5 Medium

CVSS3

Связанные уязвимости

CVE-2024-57806

ubuntu

6 месяцев назад

CVE-2024-57806

nvd

6 месяцев назад

CVE-2024-57806

debian

6 месяцев назад

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

GHSA-ffjg-532q-8rr8

github

6 месяцев назад

ELSA-2025-20480

oracle-oval

4 дня назад

ELSA-2025-20480: Unbreakable Enterprise kernel security update (IMPORTANT)

EPSS

Процентиль: 9%

0.00035

Низкий

5.5 Medium

CVSS3