CVE-2024-42084

Source
https://nvd.nist.gov/vuln/detail/CVE-2024-42084
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-42084.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2024-42084
Downstream
Related
Published
2024-07-29T17:15:11Z
Modified
2025-08-09T19:01:27Z
Summary
[none]
Details

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

ftruncate: pass a signed offset

The old ftruncate() syscall, using the 32-bit off_t misses a sign extension when called in compat mode on 64-bit architectures. As a result, passing a negative length accidentally succeeds in truncating to file size between 2GiB and 4GiB.

Changing the type of the compat syscall to the signed compatofft changes the behavior so it instead returns -EINVAL.

The native entry point, the truncate() syscall and the corresponding loff_t based variants are all correct already and do not suffer from this mistake.

References

Affected packages