Dear Intel Engineers,
On an old Xeon server running Ubuntu 22.04, when switching to the latest kernel (5.15) driver, I notice that the socperf driver segfault with:
array-index-out-of-bounds in /opt/intel/oneapi/vtune/2022.2.0/sepdk/src/socperf/src/pmu_list.c:392:60
Updating to the latest kernel (5.15.0-30-generic) didn’t solve the problem.
After looking more closely, I think I find a workaround:
At line 392 of pmu_list.c, unit_info_list is initialized with
PMU_MMIO_UNIT_INFO_NODE *unit_info_list = pmu_info_list[pmu_info_index].mmio_info_list;
However, (pmu_info_index == -1) is checked only _after_ initialization, resulting in the segfault.
Testing (pmu_info_index == -1) before initialization, I could load the socperf module.
(I then received the expected kernel message “No MMIO list information detected!”)
I am not sure if it’s useful, but if someone encounters the same trouble, here is the workaround:
392c392
< PMU_MMIO_UNIT_INFO_NODE *unit_info_list = pmu_info_list[pmu_info_index].mmio_info_list;
---
> PMU_MMIO_UNIT_INFO_NODE *unit_info_list;
394a395,400
> if (pmu_info_index == -1) {
> SOCPERF_PRINT("No MMIO list information detected!\n");
> SOCPERF_PRINT_DEBUG("Success");
> return OS_SUCCESS;
> }
> unit_info_list = pmu_info_list[pmu_info_index].mmio_info_list;
396c402
< if (pmu_info_index == -1 || !unit_info_list) {
---
> if (!unit_info_list) {
Sincerely,
