Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 670638477aede0d7a355ced04b569214aa3feacd before 456f041e035913fcedb275aff6f8a71dfebcd394; affected 670638477aede0d7a355ced04b569214aa3feacd before e83d941fd3445f660d2f43647c580a320cc384f6; affected 670638477aede0d7a355ced04b569214aa3feacd before feffb6ae2c80b9a8206450cdef90f5943baced99; affected 670638477aede0d7a355ced04b569214aa3feacd before 1d9093457b243061a9bba23543c38726e864a643 |
| Linux / Linux | affected 5.5; unaffected 0 before 5.5; unaffected 5.10.99 through 5.10.*; unaffected 5.15.22 through 5.15.*; unaffected 5.16.8 through 5.16.*; unaffected 5.17 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/456f041e035913fcedb275aff6f8a71dfebcd394
- https://git.kernel.org/stable/c/e83d941fd3445f660d2f43647c580a320cc384f6
- https://git.kernel.org/stable/c/feffb6ae2c80b9a8206450cdef90f5943baced99
- https://git.kernel.org/stable/c/1d9093457b243061a9bba23543c38726e864a643
ADP enrichment
No English description supplied.
No references supplied.
No English description supplied.