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We should ensure the size of the variable `a` is 8 bytes. Otherwise, this generates a stack buffer overflow inside the memcpy call in 32 bits machines. (We write more bytes than the size of a, when it is 4 bytes) Differential Revision: https://reviews.llvm.org/D29602 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@294378 91177308-0d34-0410-b5e6-96231b3b80d8
23 lines
557 B
C++
23 lines
557 B
C++
// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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// Simple test for a fuzzer: find interesting value of array index.
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#include <assert.h>
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#include <cstdint>
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#include <cstring>
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#include <cstddef>
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#include <iostream>
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static volatile int Sink;
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const int kArraySize = 1234567;
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int array[kArraySize];
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extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
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if (Size < 8) return 0;
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uint64_t a = 0;
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memcpy(&a, Data, 8);
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Sink = array[a % (kArraySize + 1)];
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return 0;
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}
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