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29 lines
1.0 KiB
29 lines
1.0 KiB
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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// Triggers the bug described here:
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// https://github.com/google/oss-fuzz/issues/2369#issuecomment-490240627
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//
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// In a nutshell, MSan's parameter shadow does not get unpoisoned before calls
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// to LLVMFuzzerTestOneInput. This test case causes the parameter shadow to be
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// poisoned by the call to foo(), which will trigger an MSan false positive on
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// the Size == 0 check if the parameter shadow is still poisoned.
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#include <cstdint>
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#include <cstdio>
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#include <cstdlib>
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#include <cstring>
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volatile int zero = 0;
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__attribute__((noinline)) int foo(int arg1, int arg2) { return zero; }
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extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
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if (Size == 0)
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return 0;
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// Pass uninitialized values to foo(). Since foo doesn't do anything with
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// them, MSan should not report an error here.
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int a, b;
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return foo(a, b);
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}
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