// For flags

CVE-2024-38582

nilfs2: fix potential hang in nilfs_detach_log_writer()

Severity Score

"-"
*CVSS v-

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track
*SSVC
Descriptions

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

nilfs2: fix potential hang in nilfs_detach_log_writer()

Syzbot has reported a potential hang in nilfs_detach_log_writer() called
during nilfs2 unmount.

Analysis revealed that this is because nilfs_segctor_sync(), which
synchronizes with the log writer thread, can be called after
nilfs_segctor_destroy() terminates that thread, as shown in the call trace
below:

nilfs_detach_log_writer
nilfs_segctor_destroy
nilfs_segctor_kill_thread --> Shut down log writer thread
flush_work
nilfs_iput_work_func
nilfs_dispose_list
iput
nilfs_evict_inode
nilfs_transaction_commit
nilfs_construct_segment (if inode needs sync)
nilfs_segctor_sync --> Attempt to synchronize with
log writer thread
*** DEADLOCK ***

Fix this issue by changing nilfs_segctor_sync() so that the log writer
thread returns normally without synchronizing after it terminates, and by
forcing tasks that are already waiting to complete once after the thread
terminates.

The skipped inode metadata flushout will then be processed together in the
subsequent cleanup work in nilfs_segctor_destroy().

En el kernel de Linux, se resolvió la siguiente vulnerabilidad: nilfs2: soluciona un posible bloqueo en nilfs_detach_log_writer() Syzbot ha informado de un posible bloqueo en nilfs_detach_log_writer() llamado durante el desmontaje de nilfs2. El análisis reveló que esto se debe a que nilfs_segctor_sync(), que se sincroniza con el hilo del escritor de registros, puede ser llamado después de que nilfs_segctor_destroy() finalice ese hilo, como se muestra en el seguimiento de llamadas a continuación: nilfs_detach_log_writer nilfs_segctor_destroy nilfs_segctor_kill_thread --> Apagar el hilo del escritor de registros Flush_work nilfs_iput_work_func nilfs_dispose_list iput nilfs_evict_inode nilfs_transaction_commit nilfs_construct_segment (si el inodo necesita sincronización) nilfs_segctor_sync --> Intente sincronizar con el hilo del escritor de registros *** DEADLOCK *** Solucione este problema cambiando nilfs_segctor_sync() para que el hilo del escritor de registros regrese normalmente sin sincronizarse después de que termine y forzando las tareas que ya están esperando a completarse una vez que finaliza el hilo. La eliminación de metadatos del inodo omitido se procesará en conjunto en el trabajo de limpieza posterior en nilfs_segctor_destroy().

*Credits: N/A
CVSS Scores
Attack Vector
-
Attack Complexity
-
Privileges Required
-
User Interaction
-
Scope
-
Confidentiality
-
Integrity
-
Availability
-
* Common Vulnerability Scoring System
SSVC
  • Decision:Track
Exploitation
None
Automatable
No
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2024-06-18 CVE Reserved
  • 2024-06-19 CVE Published
  • 2024-06-20 EPSS Updated
  • 2024-08-02 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
< 4.19.316
Search vendor "Linux" for product "Linux Kernel" and version " < 4.19.316"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
< 5.4.278
Search vendor "Linux" for product "Linux Kernel" and version " < 5.4.278"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
< 5.10.219
Search vendor "Linux" for product "Linux Kernel" and version " < 5.10.219"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
< 5.15.161
Search vendor "Linux" for product "Linux Kernel" and version " < 5.15.161"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
< 6.1.93
Search vendor "Linux" for product "Linux Kernel" and version " < 6.1.93"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
< 6.6.33
Search vendor "Linux" for product "Linux Kernel" and version " < 6.6.33"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
< 6.8.12
Search vendor "Linux" for product "Linux Kernel" and version " < 6.8.12"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
< 6.9.3
Search vendor "Linux" for product "Linux Kernel" and version " < 6.9.3"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
< 6.10
Search vendor "Linux" for product "Linux Kernel" and version " < 6.10"
en
Affected