Bug 215754

Summary:	KASAN (sw-tags): tag pointers to vmapped stacks
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 14:45:04 UTC

Currently, pointers to vmapped stacks are not tagged with the SW_TAGS mode. (The memory itself is tagged.). Compiler instrumentation cannot handle the SP register being tagged when KASAN_STACK is enabled.

Fix the compiler and start tagging the pointers.