Bug 217017

Summary:	KASAN (tags): investigate cma tagging
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 2023-02-09 23:50:52 UTC

Currently, cma_alloc resets page tags via page_kasan_tag_reset after allocating a memory region.

It might be possible to properly tag these allocations in a similar way as vmalloc (i.e. skipping page_alloc tagging and tagging the whole allocated range with the same pag).