Merge pull request #4179 from bshastry/ossfuzz

ossfuzz: Add simple mruby compile test harness

oss-fuzz/config/mruby.dict

+keyword___ENCODING__="__ENCODING__"
+keyword___FILE__="__FILE__"
+keyword___LINE__="__LINE__"
+keyword_BEGIN="BEGIN"
+keyword_END="END"
+keyword_alias="alias"
+keyword_and="and"
+keyword_begin="begin"
+keyword_break="break"
+keyword_case="case"
+keyword_class="class"
+keyword_def="def"
+keyword_do="do"
+keyword_else="else"
+keyword_elsif="elsif"
+keyword_end="end"
+keyword_ensure="ensure"
+keyword_false="false"
+keyword_for="for"
+keyword_if="if"
+keyword_in="in"
+keyword_module="module"
+keyword_next="next"
+keyword_nil="nil"
+keyword_not="not"
+keyword_or="or"
+keyword_redo="redo"
+keyword_rescue="rescue"
+keyword_retry="retry"
+keyword_return="return"
+keyword_self="self"
+keyword_super="super"
+keyword_then="then"
+keyword_true="true"
+keyword_undef="undef"
+keyword_unless="unless"
+keyword_until="until"
+keyword_when="when"
+keyword_while="while"
+keyword_yield="yield"
+
+operator_a=" !"
+operator_b=" ~"
+operator_c=" +"
+operator_d=" -"
+operator_e=" []"
+operator_f=" []="
+operator_g=" *"
+operator_h=" /"
+operator_i=" %"
+operator_j=" +-"
+operator_k=" >>"
+operator_l=" <<"
+operator_m=" &"
+operator_n=" ^"
+operator_o=" |"
+operator_p=" <="
+operator_q=" <>"
+operator_r=" >="
+operator_s=" <=>"
+operator_t=" =="
+operator_u=" ==="
+operator_v=" !="
+operator_w=" =~"
+operator_x=" !~"
+operator_y=" &&"
+operator_z=" ||"
+operator_aa=" .."
+operator_ab=" ..."
+operator_ac=" ?"
+operator_ad=" :"
+operator_ae=" ="
+operator_af=" %="
+operator_ag=" /="
+operator_ah=" -="
+operator_ai=" +="
+operator_aj=" |="
+operator_ak=" &="
+operator_al=" >>="
+operator_am=" <<="
+operator_an=" *="
+operator_ao=" &&="
+operator_ap=" ||="
+operator_aq=" **="
+operator_ar=" ^="
+operator_as=" not"
+operator_at=" or"
+operator_au=" and"
+operator_av=" if"
+operator_aw=" unless"
+operator_ax=" while"
+operator_ay=" until"
+operator_az=" begin"
+operator_ba=" end"
+
+snippet_1eq1=" 1=1"
+snippet_dollar=" $1"
+snippet_at=" @a"
+snippet_symbol=" :a"
+snippet_array=" [1,2]"
+snippet_block=" 1.times{|x| x}"
+snippet_multi=" 1*1"
+
+string_single_q=" 'a'"
+string_dbl_q=" \"a\""

oss-fuzz/config/mruby_fuzzer.options

+[libfuzzer]
+close_fd_mask=3
+dict=mruby.dict

oss-fuzz/mruby_fuzzer.c

+#include <stdlib.h>
+#include <string.h>
+#include <mruby.h>
+#include <mruby/compile.h>
+
+int LLVMFuzzerTestOneInput(uint8_t *Data, size_t size) {
+    if (size < 1) {
+        return 0;
+    }
+    char *code = malloc(size+1);
+    memcpy(code, Data, size);
+    code[size] = '\0';
+    mrb_state *mrb = mrb_open();
+    mrb_load_string(mrb, code);
+    mrb_close(mrb);
+    free(code);
+    return 0;
+}