Alexander Potapenko 236e9f1538 kfence: skip all GFP_ZONEMASK allocations ...

Allocation requests outside ZONE_NORMAL (MOVABLE, HIGHMEM or DMA) cannot
be fulfilled by KFENCE, because KFENCE memory pool is located in a zone
different from the requested one.

Because callers of kmem_cache_alloc() may actually rely on the
allocation to reside in the requested zone (e.g.  memory allocations
done with __GFP_DMA must be DMAable), skip all allocations done with
GFP_ZONEMASK and/or respective SLAB flags (SLAB_CACHE_DMA and
SLAB_CACHE_DMA32).

Link: https://lkml.kernel.org/r/20210714092222.1890268-2-glider@google.com
Fixes: 0ce20dd84089 ("mm: add Kernel Electric-Fence infrastructure")
Signed-off-by: Alexander Potapenko <glider@google.com>
Reviewed-by: Marco Elver <elver@google.com>
Acked-by: Souptick Joarder <jrdr.linux@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Souptick Joarder <jrdr.linux@gmail.com>
Cc: <stable@vger.kernel.org>	[5.12+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2021-07-23 17:43:28 -07:00

..

core.c

kfence: skip all GFP_ZONEMASK allocations

2021-07-23 17:43:28 -07:00

kfence_test.c

kfence: defer kfence_test_init to ensure that kunit debugfs is created

2021-07-23 17:43:28 -07:00

kfence.h

kfence: report sensitive information based on no_hash_pointers

2021-02-26 09:41:02 -08:00

Makefile

kfence: add test suite

2021-02-26 09:41:02 -08:00

report.c

mm: fix typos in comments

2021-05-07 00:26:35 -07:00