Linux Kernel
CVE-2024-35844
MEDIUM
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
1DescriptionNVD
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
AnalysisAI
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. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity.
Technical ContextAI
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 Affected products include: Linux Linux Kernel.
RemediationAI
A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.
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