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121 lines
3.0 KiB
C
121 lines
3.0 KiB
C
#include "config.h"
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#include <assert.h>
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#include <ccan/isaac/isaac64.h>
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#include <common/pseudorand.h>
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#include <stdlib.h>
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#include <string.h>
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#include <tests/fuzz/libfuzz.h>
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int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size);
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int LLVMFuzzerInitialize(int *argc, char ***argv);
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/* Provide a non-random pseudo-random function to speed fuzzing. */
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static isaac64_ctx isaac64;
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uint64_t pseudorand(uint64_t max)
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{
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assert(max);
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return isaac64_next_uint(&isaac64, max);
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}
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int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
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isaac64_init(&isaac64, NULL, 0);
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run(data, size);
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return 0;
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}
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int LLVMFuzzerInitialize(int *argc, char ***argv) {
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init(argc, argv);
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return 0;
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}
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const uint8_t **get_chunks(const void *ctx, const uint8_t *data,
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size_t data_size, size_t chunk_size)
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{
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size_t n_chunks = data_size / chunk_size;
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const uint8_t **chunks = tal_arr(ctx, const uint8_t *, n_chunks);
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for (size_t i = 0; i < n_chunks; i++)
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chunks[i] = tal_dup_arr(chunks, const uint8_t,
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data + i * chunk_size, chunk_size, 0);
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return chunks;
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}
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char *to_string(const tal_t *ctx, const u8 *data, size_t data_size)
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{
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char *string = tal_arr(ctx, char, data_size + 1);
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for (size_t i = 0; i < data_size; i++)
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string[i] = (char) data[i] % (CHAR_MAX + 1);
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string[data_size] = '\0';
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return string;
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}
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static size_t insert_part(const u8 *in1, size_t in1_size, const u8 *in2,
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size_t in2_size, u8 *out, size_t max_out_size)
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{
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size_t max_insert_size;
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size_t insert_begin;
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size_t insert_size;
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size_t in2_begin;
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if (in1_size >= max_out_size)
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return 0;
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if (in1_size == 0 || in2_size == 0)
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return 0;
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max_insert_size = max_out_size - in1_size;
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if (max_insert_size > in2_size)
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max_insert_size = in2_size;
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insert_begin = rand() % in1_size;
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insert_size = (rand() % max_insert_size) + 1;
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in2_begin = rand() % (in2_size - insert_size + 1);
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memcpy(out, in1, insert_begin);
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memcpy(out + insert_begin, in2 + in2_begin, insert_size);
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memcpy(out + insert_begin + insert_size, in1 + insert_begin,
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in1_size - insert_begin);
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return in1_size + insert_size;
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}
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static size_t overwrite_part(const u8 *in1, size_t in1_size, const u8 *in2,
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size_t in2_size, u8 *out, size_t max_out_size)
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{
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size_t overwrite_begin;
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size_t overwrite_size;
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size_t in2_begin;
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if (in1_size > max_out_size)
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return 0;
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if (in1_size == 0)
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return 0;
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overwrite_begin = rand() % in1_size;
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overwrite_size = (rand() % (in1_size - overwrite_begin)) + 1;
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if (overwrite_size > in2_size)
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overwrite_size = in2_size;
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in2_begin = rand() % (in2_size - overwrite_size + 1);
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memcpy(out, in1, in1_size);
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memcpy(out + overwrite_begin, in2 + in2_begin, overwrite_size);
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return in1_size;
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}
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size_t cross_over(const u8 *in1, size_t in1_size, const u8 *in2,
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size_t in2_size, u8 *out, size_t max_out_size, unsigned seed)
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{
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srand(seed);
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if (rand() % 2)
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return insert_part(in1, in1_size, in2, in2_size, out,
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max_out_size);
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return overwrite_part(in1, in1_size, in2, in2_size, out, max_out_size);
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}
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