kmsan: introduce test_memcpy_initialized_gap()

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Add a regression test for the special case where memcpy() previously
failed to correctly set the origins: if upon memcpy() four aligned
initialized bytes with a zero origin value ended up split between two
aligned four-byte chunks, one of those chunks could've received the zero
origin value even despite it contained uninitialized bytes from other
writes.

Link: https://lkml.kernel.org/r/20230911145702.2663753-4-glider@google.com
Signed-off-by: Alexander Potapenko <glider@google.com>
Suggested-by: Marco Elver <elver@google.com>
Acked-by: Marco Elver <elver@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

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Alexander Potapenko 2023-09-11 16:57:02 +02:00 • committed by Andrew Morton

parent c3ab4873c8

commit 46fa84a2b9

1 changed files with 53 additions and 0 deletions

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mm/kmsan/kmsan_test.c

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