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linux/mm/kmsan
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Alexander Potapenko 47ebd0310e mm: kmsan: handle alloc failures in kmsan_vmap_pages_range_noflush() 
As reported by Dipanjan Das, when KMSAN is used together with kernel fault
injection (or, generally, even without the latter), calls to kcalloc() or
__vmap_pages_range_noflush() may fail, leaving the metadata mappings for
the virtual mapping in an inconsistent state.  When these metadata
mappings are accessed later, the kernel crashes.

To address the problem, we return a non-zero error code from
kmsan_vmap_pages_range_noflush() in the case of any allocation/mapping
failure inside it, and make vmap_pages_range_noflush() return an error if
KMSAN fails to allocate the metadata.

This patch also removes KMSAN_WARN_ON() from vmap_pages_range_noflush(),
as these allocation failures are not fatal anymore.

Link: https://lkml.kernel.org/r/20230413131223.4135168-1-glider@google.com
Fixes: b073d7f8ae ("mm: kmsan: maintain KMSAN metadata for page operations")
Signed-off-by: Alexander Potapenko <glider@google.com>
Reported-by: Dipanjan Das <mail.dipanjan.das@gmail.com>
  Link: https://lore.kernel.org/linux-mm/CANX2M5ZRrRA64k0hOif02TjmY9kbbO2aCBPyq79es34RXZ=cAw@mail.gmail.com/
Reviewed-by: Marco Elver <elver@google.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Uladzislau Rezki (Sony) <urezki@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2023-04-18 14:22:13 -07:00
..
core.c lib/stacktrace, kasan, kmsan: rework extra_bits interface 2023-02-16 20:43:51 -08:00
hooks.c kmsan: export kmsan_handle_urb 2022-12-21 14:31:52 -08:00
init.c init: kmsan: call KMSAN initialization routines 2022-10-03 14:03:21 -07:00
instrumentation.c kmsan: silence -Wmissing-prototypes warnings 2023-02-02 22:33:05 -08:00
kmsan.h kmsan: core: kmsan_in_runtime() should return true in NMI context 2022-11-08 15:57:24 -08:00
kmsan_test.c kmsan: include linux/vmalloc.h 2022-12-21 14:31:51 -08:00
Makefile kmsan: disable ftrace in kmsan core code 2023-02-20 12:46:16 -08:00
report.c
shadow.c mm: kmsan: handle alloc failures in kmsan_vmap_pages_range_noflush() 2023-04-18 14:22:13 -07:00