bpf: Fix may_goto with negative offset.
Zac's syzbot crafted a bpf prog that exposed two bugs in may_goto.
The 1st bug is the way may_goto is patched. When offset is negative
it should be patched differently.
The 2nd bug is in the verifier:
when current state may_goto_depth is equal to visited state may_goto_depth
it means there is an actual infinite loop. It's not correct to prune
exploration of the program at this point.
Note, that this check doesn't limit the program to only one may_goto insn,
since 2nd and any further may_goto will increment may_goto_depth only
in the queued state pushed for future exploration. The current state
will have may_goto_depth == 0 regardless of number of may_goto insns
and the verifier has to explore the program until bpf_exit.
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Tracking
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Thu, 01 May 2025 15:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| CPEs | cpe:2.3:o:linux:linux_kernel:6.10:rc1:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.10:rc2:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.10:rc3:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.10:rc4:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.10:rc5:*:*:*:*:*:* |
Sat, 28 Sep 2024 02:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Weaknesses | CWE-822 |
Wed, 11 Sep 2024 13:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
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Status: PUBLISHED
Assigner: Linux
Published:
Updated: 2026-05-11T20:26:26.329Z
Reserved: 2024-07-29T15:50:41.168Z
Link: CVE-2024-42072
Updated: 2024-08-02T04:54:31.986Z
Status : Analyzed
Published: 2024-07-29T16:15:06.693
Modified: 2025-05-01T15:22:25.793
Link: CVE-2024-42072
OpenCVE Enrichment
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