Description
In the Linux kernel, the following vulnerability has been resolved: x86/resctrl: Fix allocation of cleanest CLOSID on platforms with no monitors Commit 6eac36bb9eb0 ("x86/resctrl: Allocate the cleanest CLOSID by searching closid_num_dirty_rmid") added logic that causes resctrl to search for the CLOSID with the fewest dirty cache lines when creating a new control group, if requested by the arch code. This depends on the values read from the llc_occupancy counters. The logic is applicable to architectures where the CLOSID effectively forms part of the monitoring identifier and so do not allow complete freedom to choose an unused monitoring identifier for a given CLOSID. This support missed that some platforms may not have these counters. This causes a NULL pointer dereference when creating a new control group as the array was not allocated by dom_data_init(). As this feature isn't necessary on platforms that don't have cache occupancy monitors, add this to the check that occurs when a new control group is allocated.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
6eac36bb9eb0349c983313c71692c19d50b56878 to < a8a1bcc27d4607227088d80483164289b5348293affected6eac36bb9eb0349c983313c71692c19d50b56878 to < ed5addb55e403ad6598102bcf546e068ae01fef6affected6eac36bb9eb0349c983313c71692c19d50b56878 to < 93a418fc61da13d1ee4047d4d1327990f7a2816aaffected6eac36bb9eb0349c983313c71692c19d50b56878 to < a121798ae669351ec0697c94f71c3a692b2a755baffected
Linux Linux
Default version status: affected
6.9affected0 to < 6.9unaffected6.12.23 to ≤ 6.12.*unaffected6.13.11 to ≤ 6.13.*unaffected6.14.2 to ≤ 6.14.*unaffected6.15 to ≤ *unaffected