CVE-2024-56780

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2024-56780
In the Linux kernel, the following vulnerability has been resolved: quota: flush quota_release_work upon quota writeback One of the paths quota writeback is called from is: freeze_super() sync_filesystem() ext4_sync_fs() dquot_writeback_dquots() Since we currently don't always flush the quota_release_work queue in this path, we can end up with the following race: 1. dquot are added to releasing_dquots list during regular operations. 2. FS Freeze starts, however, this does not flush the quota_release_work queue. 3. Freeze completes. 4. Kernel eventually tries to flush the workqueue while FS is frozen which hits a WARN_ON since transaction gets started during frozen state: ext4_journal_check_start+0x28/0x110 [ext4] (unreliable) __ext4_journal_start_sb+0x64/0x1c0 [ext4] ext4_release_dquot+0x90/0x1d0 [ext4] quota_release_workfn+0x43c/0x4d0 Which is the following line: WARN_ON(sb->s_writers.frozen == SB_FREEZE_COMPLETE); Which ultimately results in generic/390 failing due to dmesg noise. This was detected on powerpc machine 15 cores. To avoid this, make sure to flush the workqueue during dquot_writeback_dquots() so we dont have any pending workitems after freeze.

5.5 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/3e6ff207cd5bd924ad94cd1a7c633bcdac0ba1cb Patch
https://git.kernel.org/stable/c/6f3821acd7c3143145999248087de5fb4b48cf26 Patch
https://git.kernel.org/stable/c/8ea87e34792258825d290f4dc5216276e91cb224 Patch
https://git.kernel.org/stable/c/a5abba5e0e586e258ded3e798fe5f69c66fec198 Patch
https://git.kernel.org/stable/c/ab6cfcf8ed2c7496f55d020b65b1d8cd55d9a2cb Patch
https://git.kernel.org/stable/c/ac6f420291b3fee1113f21d612fa88b628afab5b Patch
https://git.kernel.org/stable/c/bcacb52a985f1b6d280f698a470b873dfe52728a Patch
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:*
History

09 Jan 2025, 21:50

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/3e6ff207cd5bd924ad94cd1a7c633bcdac0ba1cb - () https://git.kernel.org/stable/c/3e6ff207cd5bd924ad94cd1a7c633bcdac0ba1cb - Patch
References () https://git.kernel.org/stable/c/6f3821acd7c3143145999248087de5fb4b48cf26 - () https://git.kernel.org/stable/c/6f3821acd7c3143145999248087de5fb4b48cf26 - Patch
References () https://git.kernel.org/stable/c/8ea87e34792258825d290f4dc5216276e91cb224 - () https://git.kernel.org/stable/c/8ea87e34792258825d290f4dc5216276e91cb224 - Patch
References () https://git.kernel.org/stable/c/a5abba5e0e586e258ded3e798fe5f69c66fec198 - () https://git.kernel.org/stable/c/a5abba5e0e586e258ded3e798fe5f69c66fec198 - Patch
References () https://git.kernel.org/stable/c/ab6cfcf8ed2c7496f55d020b65b1d8cd55d9a2cb - () https://git.kernel.org/stable/c/ab6cfcf8ed2c7496f55d020b65b1d8cd55d9a2cb - Patch
References () https://git.kernel.org/stable/c/ac6f420291b3fee1113f21d612fa88b628afab5b - () https://git.kernel.org/stable/c/ac6f420291b3fee1113f21d612fa88b628afab5b - Patch
References () https://git.kernel.org/stable/c/bcacb52a985f1b6d280f698a470b873dfe52728a - () https://git.kernel.org/stable/c/bcacb52a985f1b6d280f698a470b873dfe52728a - Patch
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:*
First Time Linux linux Kernel
Linux
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: quota: vaciar quota_release_work al reescribir la cuota Una de las rutas desde las que se llama a la reescritura de cuota es: freeze_super() sync_filesystem() ext4_sync_fs() dquot_writeback_dquots() Dado que actualmente no siempre vaciamos la cola quota_release_work en esta ruta, podemos terminar con la siguiente carrera: 1. dquot se agregan a la lista release_dquots durante las operaciones regulares. 2. FS Freeze comienza, sin embargo, esto no vacía la cola quota_release_work. 3. Freeze se completa. 4. El kernel finalmente intenta vaciar la cola de trabajo mientras FS está congelado, lo que genera un WARN_ON ya que la transacción se inicia durante el estado congelado: ext4_journal_check_start+0x28/0x110 [ext4] (no confiable) __ext4_journal_start_sb+0x64/0x1c0 [ext4] ext4_release_dquot+0x90/0x1d0 [ext4] quota_release_workfn+0x43c/0x4d0 Que es la siguiente línea: WARN_ON(sb->s_writers.frozen == SB_FREEZE_COMPLETE); Lo que finalmente da como resultado que generic/390 falle debido al ruido de dmesg. Esto se detectó en una máquina PowerPC de 15 núcleos. Para evitar esto, asegúrese de vaciar la cola de trabajo durante dquot_writeback_dquots() para que no tengamos ningún elemento de trabajo pendiente después del congelamiento.
CWE NVD-CWE-noinfo
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5

08 Jan 2025, 18:15

Type Values Removed Values Added
New CVE
Information

Published : 2025-01-08 18:15

Updated : 2025-01-09 21:50

NVD link : CVE-2024-56780

Mitre link : CVE-2024-56780

CVE.ORG link : CVE-2024-56780

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
NVD-CWE-noinfo