Kees Cook [off-list ref] writes:

Under CONFIG_HARDENED_USERCOPY, this adds object size checking to the
SLUB allocator to catch any copies that may span objects. Includes a
redzone handling fix from Michael Ellerman.

Actually I think you wrote the fix, I just pointed you in that
direction. But anyway, this works for me, so if you like:

Tested-by: Michael Ellerman <mpe@ellerman.id.au>

cheers
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