kcsan: Never set up watchpoints on NULL pointers

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Avoid setting up watchpoints on NULL pointers, as otherwise we would
crash inside the KCSAN runtime (when checking for value changes) instead
of the instrumented code.

Because that may be confusing, skip any address less than PAGE_SIZE.

Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

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Marco Elver 2020-10-22 13:45:53 +02:00 • committed by Paul E. McKenney

parent 4761612ffe

commit 55a2346c7a

1 changed files with 5 additions and 1 deletions

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kernel/kcsan/encoding.h

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