Bug 218358

Summary:	KASAN (hw-tags): respect page_alloc sampling for large kmalloc
Product:	Memory Management	Reporter:	Andrey Konovalov (andreyknvl)
Component:	Sanitizers	Assignee:	MM/Sanitizers virtual assignee (mm_sanitizers)
Status:	NEW ---
Severity:	normal	CC:	kasan-dev
Priority:	P3
Hardware:	All
OS:	Linux
Kernel Version:		Subsystem:
Regression:	No	Bisected commit-id:

Description Andrey Konovalov 2024-01-10 03:00:08 UTC

Currently, KASAN always poisons/unpoisons large kmalloc allocations (the ones that fall back onto page_alloc) without checking whether the poisoning was excluded due to page_alloc sampling.

We need to add checks similar to the one in kasan_mempool_poison_pages to kasan_mempool_poison_object, kasan_kmalloc_large, and kasan_kfree_large.

Comment 1 Andrey Konovalov 2024-01-10 03:03:32 UTC

This becomes obsolete if https://bugzilla.kernel.org/show_bug.cgi?id=218322 is implemented.