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https://github.com/janet-lang/janet
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Updated the libfuzzer to target marshalling.
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@ -2,15 +2,39 @@
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#include <string.h>
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#include <janet.h>
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char *cmd_start = "(def v (unmarshal (slurp ((dyn :";
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char *cmd_end = ") 1)) load-image-dict));
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int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
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char *new_str = (char *)malloc(size + 1);
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char *new_str = (char *)malloc(size + strlen(cmd_start) + strlen(cmd_end) + 1);
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if (new_str == NULL) {
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return 0;
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}
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memcpy(new_str, data, size);
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new_str[size] = '\0';
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// Copy start of command into the string we will execute
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memcpy(new_str, cmd_start, strlen(cmd_start));
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/* janet logic */
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// Copy fuzz-data into the exec string
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char *datap = new_str + strlen(cmd_start);
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memcpy(datap, data, size);
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// Copy the end of the command into the exec string
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end_data = datap + size;
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memcpy(end_data, cmd_end, strlen(cmd_end));
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char *null_terminator = end_data + strlen(cmd_end) + 1;
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*null_terminator = '\0';
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// Remove any parentheses from the fuzz data
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for (int i = 0; i < size; i++)
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{
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if (datap[i] == '(')
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datap[i] = (char)(datap[i] + 1);
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if (datap[i] == ')')
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datap[i] = (char)(datap[i] + 1);
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}
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// janet logic
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janet_init();
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JanetTable *env = janet_core_env(NULL);
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janet_dostring(env, new_str, "main", NULL);
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