CVE-2022-48713

Summary

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

perf/x86/intel/pt: Fix crash with stop filters in single-range mode

Add a check for !buf->single before calling pt_buffer_region_size in a place where a missing check can cause a kernel crash.

Fixes a bug introduced by commit 670638477aed ("perf/x86/intel/pt: Opportunistically use single range output mode"), which added a support for PT single-range output mode. Since that commit if a PT stop filter range is hit while tracing, the kernel will crash because of a null pointer dereference in pt_handle_status due to calling pt_buffer_region_size without a ToPA configured.

The commit which introduced single-range mode guarded almost all uses of the ToPA buffer variables with checks of the buf->single variable, but missed the case where tracing was stopped by the PT hardware, which happens when execution hits a configured stop filter.

Tested that hitting a stop filter while PT recording successfully records a trace with this patch but crashes without this patch.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux670638477aede0d7a355ced04b569214aa3feacd < 456f041e035913fcedb275aff6f8a71dfebcd394affected
LinuxLinux670638477aede0d7a355ced04b569214aa3feacd < e83d941fd3445f660d2f43647c580a320cc384f6affected
LinuxLinux670638477aede0d7a355ced04b569214aa3feacd < feffb6ae2c80b9a8206450cdef90f5943baced99affected
LinuxLinux670638477aede0d7a355ced04b569214aa3feacd < 1d9093457b243061a9bba23543c38726e864a643affected
LinuxLinux5.5affected
LinuxLinux0 < 5.5unaffected
LinuxLinux5.10.99 <= 5.10.*unaffected
LinuxLinux5.15.22 <= 5.15.*unaffected
LinuxLinux5.16.8 <= 5.16.*unaffected
LinuxLinux5.17 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

CVE Program Container

Additional References

References