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instrumented.h: allow instrumenting both sides of copy_from_user()
Introduce instrument_copy_from_user_before() and instrument_copy_from_user_after() hooks to be invoked before and after the call to copy_from_user(). KASAN and KCSAN will be only using instrument_copy_from_user_before(), but for KMSAN we'll need to insert code after copy_from_user(). Signed-off-by: Alexander Potapenko <glider@google.com>
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