kcsan: Fix 0-sized checks

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Instrumentation of arbitrary memory-copy functions, such as user-copies,
may be called with size of 0, which could lead to false positives.

To avoid this, add a comparison in check_access() for size==0, which
will be optimized out for constant sized instrumentation
(__tsan_{read,write}N), and therefore not affect the common-case
fast-path.

Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

...

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Marco Elver 2020-02-05 11:14:19 +01:00 • committed by Ingo Molnar

parent 8cfbb04fae

commit ed95f95c86

2 changed files with 17 additions and 0 deletions

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7

kernel/kcsan/core.c

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10

kernel/kcsan/test.c

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