CVE-2024-35844
f2fs: compress: fix reserve_cblocks counting error when out of space
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
In the Linux kernel, the following vulnerability has been resolved:
f2fs: compress: fix reserve_cblocks counting error when out of space
When a file only needs one direct_node, performing the following
operations will cause the file to be unrepairable:
unisoc # ./f2fs_io compress test.apk
unisoc #df -h | grep dm-48
/dev/block/dm-48 112G 112G 1.2M 100% /data
unisoc # ./f2fs_io release_cblocks test.apk
924
unisoc # df -h | grep dm-48
/dev/block/dm-48 112G 112G 4.8M 100% /data
unisoc # dd if=/dev/random of=file4 bs=1M count=3
3145728 bytes (3.0 M) copied, 0.025 s, 120 M/s
unisoc # df -h | grep dm-48
/dev/block/dm-48 112G 112G 1.8M 100% /data
unisoc # ./f2fs_io reserve_cblocks test.apk
F2FS_IOC_RESERVE_COMPRESS_BLOCKS failed: No space left on device
adb reboot
unisoc # df -h | grep dm-48
/dev/block/dm-48 112G 112G 11M 100% /data
unisoc # ./f2fs_io reserve_cblocks test.apk
0
This is because the file has only one direct_node. After returning
to -ENOSPC, reserved_blocks += ret will not be executed. As a result,
the reserved_blocks at this time is still 0, which is not the real
number of reserved blocks. Therefore, fsck cannot be set to repair
the file.
After this patch, the fsck flag will be set to fix this problem.
unisoc # df -h | grep dm-48
/dev/block/dm-48 112G 112G 1.8M 100% /data
unisoc # ./f2fs_io reserve_cblocks test.apk
F2FS_IOC_RESERVE_COMPRESS_BLOCKS failed: No space left on device
adb reboot then fsck will be executed
unisoc # df -h | grep dm-48
/dev/block/dm-48 112G 112G 11M 100% /data
unisoc # ./f2fs_io reserve_cblocks test.apk
924
En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: f2fs: compress: corrige el error de conteo de reserve_cblocks cuando no hay espacio. Cuando un archivo solo necesita un direct_node, realizar las siguientes operaciones hará que el archivo no se pueda reparar: unisoc # ./f2fs_io compress test.apk unisoc #df -h | grep dm-48 /dev/block/dm-48 112G 112G 1.2M 100% /data unisoc # ./f2fs_io release_cblocks test.apk 924 unisoc # df -h | grep dm-48 /dev/block/dm-48 112G 112G 4,8M 100% /data unisoc # dd if=/dev/random of=file4 bs=1M count=3 3145728 bytes (3,0 M) copiados, 0,025 s, 120 M/s unisoc # df -h | grep dm-48 /dev/block/dm-48 112G 112G 1.8M 100% /data unisoc # ./f2fs_io reserve_cblocks test.apk F2FS_IOC_RESERVE_COMPRESS_BLOCKS falló: no queda espacio en el dispositivo adb reboot unisoc # df -h | grep dm-48 /dev/block/dm-48 112G 112G 11M 100% /data unisoc # ./f2fs_io reserve_cblocks test.apk 0 Esto se debe a que el archivo tiene solo un nodo_directo. Después de regresar a -ENOSPC, reserve_blocks += ret no se ejecutará. Como resultado, los bloques_reservados en este momento siguen siendo 0, que no es el número real de bloques reservados. Por lo tanto, no se puede configurar fsck para reparar el archivo. Después de este parche, se configurará el indicador fsck para solucionar este problema. unisoc # df -h | grep dm-48 /dev/block/dm-48 112G 112G 1.8M 100% /data unisoc # ./f2fs_io reserve_cblocks test.apk F2FS_IOC_RESERVE_COMPRESS_BLOCKS falló: no queda espacio en el dispositivo y al reinicio del adb luego se ejecutará fsck unisoc # df -h | grep dm-48 /dev/block/dm-48 112G 112G 11M 100% /data unisoc # ./f2fs_io reserve_cblocks test.apk 924
CVSS Scores
SSVC
- Decision:Track
Timeline
- 2024-05-17 CVE Reserved
- 2024-05-17 CVE Published
- 2024-05-18 EPSS Updated
- 2024-12-19 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
CAPEC
References (9)
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Affected Vendors, Products, and Versions
Vendor | Product | Version | Other | Status | ||||||
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Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.8 < 5.15.153 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.8 < 5.15.153" | en |
Affected
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Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.8 < 6.1.83 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.8 < 6.1.83" | en |
Affected
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Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.8 < 6.6.23 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.8 < 6.6.23" | en |
Affected
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Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.8 < 6.7.11 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.8 < 6.7.11" | en |
Affected
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Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.8 < 6.8.2 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.8 < 6.8.2" | en |
Affected
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Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.8 < 6.9 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.8 < 6.9" | en |
Affected
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