Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: perf/x86/intel: Prevent drain_pebs() reentry The PEBS buffer is shared by all events on a CPU, so drain_pebs() must not be reentered. If so, one instance may observe stale buffer state and potentially access out-of-bound memory. Most invocations happen in NMI context, which naturally prevents reentry. However, drain_pebs() is also reachable from process context via intel_pmu_drain_pebs_buffer(). In those paths, the PMU is often already disabled, but not guaranteed. For example, __intel_pmu_pebs_disable() only disables the target counter, so other active counters can still raise a PMI and interrupt an in-flight drain_pebs(). Here is an example, __perf_addr_filters_adjust() perf_event_stop() __perf_event_stop() x86_pmu_stop() (event->pmu->stop) intel_pmu_disable_event() intel_pmu_pebs_disable() __intel_pmu_pebs_disable() intel_pmu_drain_large_pebs() intel_pmu_drain_pebs_buffer() Introduce __intel_pmu_quiesce() and __intel_pmu_resume() helpers and use them in intel_pmu_drain_large_pebs() to disable the full PMU around the intel_pmu_drain_pebs_buffer() call, preventing reentry. Also add a warning in intel_pmu_drain_pebs_buffer() when the full PMU is not disabled.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected b752ea0c28e3f7f0aaaad6abf84f735eebc37a60 before 9882068ed242fcd4743f53027e8c790e88dcafff; affected b752ea0c28e3f7f0aaaad6abf84f735eebc37a60 before 999e482fdf89400cc1ae937680fc05096b4c915b; affected b752ea0c28e3f7f0aaaad6abf84f735eebc37a60 before a5fe19dd8b3ed5fad6e5e0f0c58c7245043ee4af; affected b752ea0c28e3f7f0aaaad6abf84f735eebc37a60 before c55599c0ec2aa020e41a0599c3044c56d8a2e7d9; affected b752ea0c28e3f7f0aaaad6abf84f735eebc37a60 before a56c03a397e2cd0c4cf8da96dcd6214f7d0e7d8c; affected a9165207b2b07415eeb01b3ac8bb84976ec96984; affected 6.3.7 before 6.4 |
| Linux / Linux | affected 6.4; unaffected 0 before 6.4; unaffected 6.6.160 through 6.6.*; unaffected 6.12.114 through 6.12.*; unaffected 6.18.53 through 6.18.*; unaffected 7.2.7 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/9882068ed242fcd4743f53027e8c790e88dcafff
- https://git.kernel.org/stable/c/999e482fdf89400cc1ae937680fc05096b4c915b
- https://git.kernel.org/stable/c/a5fe19dd8b3ed5fad6e5e0f0c58c7245043ee4af
- https://git.kernel.org/stable/c/c55599c0ec2aa020e41a0599c3044c56d8a2e7d9
- https://git.kernel.org/stable/c/a56c03a397e2cd0c4cf8da96dcd6214f7d0e7d8c