CVE-2024-56675: bpf: Fix UAF via mismatching bpf_prog/attachment RCU flavors
First published: Fri Dec 27 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix UAF via mismatching bpf_prog/attachment RCU flavors Uprobes always use bpf_prog_run_array_uprobe() under tasks-trace-RCU protection. But it is possible to attach a non-sleepable BPF program to a uprobe, and non-sleepable BPF programs are freed via normal RCU (see __bpf_prog_put_noref()). This leads to UAF of the bpf_prog because a normal RCU grace period does not imply a tasks-trace-RCU grace period. Fix it by explicitly waiting for a tasks-trace-RCU grace period after removing the attachment of a bpf_prog to a perf_event.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | >=6.0<6.1.121 | |
| Linux Linux kernel | >=6.2<6.6.67 | |
| Linux Linux kernel | >=6.7<6.12.6 | |
| Linux Linux kernel | =6.13-rc1 | |
| Linux Linux kernel | =6.13-rc2 |
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