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CVE-2024-42231 Detail

Description

In the Linux kernel, the following vulnerability has been resolved: btrfs: zoned: fix calc_available_free_space() for zoned mode calc_available_free_space() returns the total size of metadata (or system) block groups, which can be allocated from unallocated disk space. The logic is wrong on zoned mode in two places. First, the calculation of data_chunk_size is wrong. We always allocate one zone as one chunk, and no partial allocation of a zone. So, we should use zone_size (= data_sinfo->chunk_size) as it is. Second, the result "avail" may not be zone aligned. Since we always allocate one zone as one chunk on zoned mode, returning non-zone size aligned bytes will result in less pressure on the async metadata reclaim process. This is serious for the nearly full state with a large zone size device. Allowing over-commit too much will result in less async reclaim work and end up in ENOSPC. We can align down to the zone size to avoid that.


Metrics

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CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

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Hyperlink Resource
https://git.kernel.org/stable/c/64d2c847ba380e07b9072d65a50aa6469d2aa43f Patch 
https://git.kernel.org/stable/c/64d2c847ba380e07b9072d65a50aa6469d2aa43f Patch 
https://git.kernel.org/stable/c/8548903b1999bba02a2b894ad750ab8eb1f40307 Patch 
https://git.kernel.org/stable/c/8548903b1999bba02a2b894ad750ab8eb1f40307 Patch 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-682 Incorrect Calculation cwe source acceptance level NIST  

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Change History

3 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2024-42231
NVD Published Date:
07/30/2024
NVD Last Modified:
11/21/2024
Source:
kernel.org