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Kernel Address Sanitizer uses 3 bits per byte to
encode memory. That is the number of bits the start
and end address of a memory range is shifted right
when the corresponding shadow memory is created for
that memory range.
The used memory mapping routine expects page-aligned
addresses, while the above described 3-bit shift might
turn the shadow memory range start and end boundaries
into non-page-aligned in case the size of the original
memory range is less than (PAGE_SIZE << 3). As result,
the resulting shadow memory range could be short on one
page.
Align on page boundary the start and end addresses when
mapping a shadow memory range and avoid the described
issue in the future.
Note, that does not fix a real problem, since currently
no virtual regions of size less than (PAGE_SIZE << 3)
exist.
Reviewed-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
3e8261003b