CVE-2023-52813

Source
https://nvd.nist.gov/vuln/detail/CVE-2023-52813
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-52813.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2023-52813
Downstream
Related
Published
2024-05-21T16:15:19Z
Modified
2025-09-26T16:58:22Z
Severity
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

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

crypto: pcrypt - Fix hungtask for PADATA_RESET

We found a hungtask bug in testaeadvec_cfg as follows:

INFO: task cryptomgrtest:391009 blocked for more than 120 seconds. "echo 0 > /proc/sys/kernel/hungtasktimeoutsecs" disables this message. Call trace: _switchto+0x98/0xe0 _schedule+0x6c4/0xf40 schedule+0xd8/0x1b4 scheduletimeout+0x474/0x560 waitforcommon+0x368/0x4e0 waitforcompletion+0x20/0x30 waitforcompletion+0x20/0x30 testaeadveccfg+0xab4/0xd50 testaead+0x144/0x1f0 algtestaead+0xd8/0x1e0 algtest+0x634/0x890 cryptomgrtest+0x40/0x70 kthread+0x1e0/0x220 retfromfork+0x10/0x18 Kernel panic - not syncing: hung_task: blocked tasks

For padatadoparallel, when the return err is 0 or -EBUSY, it will call waitforcompletion(&wait->completion) in testaeadveccfg. In normal case, aeadrequestcomplete() will be called in pcryptaeadserial and the return err is 0 for padatadoparallel. But, when pinst->flags is PADATARESET, the return err is -EBUSY for padatadoparallel, and it won't call aeadrequestcomplete(). Therefore, testaeadveccfg will hung at waitfor_completion(&wait->completion), which will cause hungtask.

The problem comes as following: (padatadoparallel) | rcureadlockbh(); | err = -EINVAL; | (padatareplace) | pinst->flags |= PADATARESET; err = -EBUSY | if (pinst->flags & PADATARESET) | rcureadunlock_bh() | return err

In order to resolve the problem, we replace the return err -EBUSY with -EAGAIN, which means parallel_data is changing, and the caller should call it again.

v3: remove retry and just change the return err. v2: introduce padatatrydoparallel() in pcryptaeadencrypt and pcryptaead_decrypt to solve the hungtask.

References

Affected packages