Bug 215758

Summary:	KASAN (hw-tags): tag vmalloced per-cpu areas
Product:	Memory Management	Reporter:	Andrey Konovalov (andreyknvl)
Component:	Sanitizers	Assignee:	MM/Sanitizers virtual assignee (mm_sanitizers)
Status:	NEW ---
Severity:	normal	CC:	kasan-dev
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	upstream	Subsystem:
Regression:	No	Bisected commit-id:

Description Andrey Konovalov 2022-03-27 15:04:12 UTC

Currently, HW_TAGS KASAN does not tag the per-CPU areas allocated by pcpu_get_vm_areas(). The problem with these is that they are not mapped in mm/vmalloc.c but in percpu-vm.c, and the HW_TAGS mode cannot tag memory before it is mapped.

Add custom annotations to percpu-vm.c to tag these per-CPU areas.

The implementation should be in sync with the SW_TAGS mode.

Comment 1 Andrey Konovalov 2022-03-29 18:02:15 UTC

Related bug: https://bugzilla.kernel.org/show_bug.cgi?id=215019