Bug 215755

Summary:	KASAN (hw-tags): investigate tagging 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 14:45:57 UTC

Currently, pointers to vmapped stacks are not tagged with the HW_TAG mode. (The memory itself is tagged.)

Evaluate the impact of having a tagged SP register in production, and possibly tag the pointers.

Optionally do this as a part of adding stack variables tagging support [1].

[1] https://bugzilla.kernel.org/show_bug.cgi?id=211779