kh_get_n2s() stack overrun

Defining recursive classes could lead to a stack overrun in **kh_get_n2s**, POC ===================== With this code we can achieve a stack overflow ``` class<<Proc class P class<<Proc class P class P t end end end end end ``` Debug analysis ===================== ``` simo@vlab64:~/sources/mruby/bin/mruby/% cat CR1.rb | ../mruby_asan ASAN:DEADLYSIGNAL ================================================================= ==99188==ERROR: AddressSanitizer: stack-overflow on address 0x7ffd22656fc8 (pc 0x000000431cd0 bp 0x7ffd22657850 sp 0x7ffd22656fd0 T0) #0 0x431ccf in __interceptor_memcmp (/home/simo/sources/mruby/bin/fuzz_mruby/mruby_asan+0x431ccf) #1 0x534636 in kh_get_n2s /home/simo/sources/mruby_libF/src/symbol.c:37:1 #2 0x5363d2 in sym_intern /home/simo/sources/mruby_libF/src/symbol.c:62:9 #3 0x524fc5 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1562:23 #4 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #5 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #6 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #7 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #8 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #9 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #10 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #11 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #12 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #13 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #14 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #15 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #16 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #17 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #18 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #19 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #20 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #21 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #22 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #23 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #24 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #25 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #26 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #27 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #28 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #29 0x525110 in mrb_class_path 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/home/simo/sources/mruby_libF/src/class.c:1574:24 #198 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #199 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #200 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #201 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #202 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #203 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #204 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #205 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #206 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #207 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #208 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #209 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #210 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #211 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #212 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #213 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #214 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #215 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #216 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #217 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #218 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #219 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #220 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #221 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #222 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #223 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #224 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #225 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #226 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #227 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #228 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #229 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #230 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #231 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #232 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #233 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #234 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #235 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #236 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #237 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #238 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #239 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #240 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #241 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #242 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #243 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #244 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #245 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #246 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #247 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #248 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 #249 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24 SUMMARY: AddressSanitizer: stack-overflow (/home/simo/sources/mruby/bin/mruby/mruby_asan+0x431ccf) in __interceptor_memcmp ==99188==ABORTING ``` ``` (gdb) r < CR1.rb Starting program: /home/simo/sources/mruby/bin/mruby/mruby < CR1.rb Program received signal SIGSEGV, Segmentation fault. 0x0000000000413b9d in sym_hash_func (mrb=<error reading variable: Cannot access memory at address 0x7fffff7fefd8>, s=<error reading variable: Cannot access memory at address 0x7fffff7fefd4>) at /home/simo/sources/patch/mruby/src/symbol.c:24 24 { (gdb) x/5i $pc => 0x413b9d <sym_hash_func+4>: mov %rdi,-0x28(%rbp) 0x413ba1 <sym_hash_func+8>: mov %esi,-0x2c(%rbp) 0x413ba4 <sym_hash_func+11>: movl $0x0,-0x1c(%rbp) 0x413bab <sym_hash_func+18>: mov -0x28(%rbp),%rax 0x413baf <sym_hash_func+22>: mov 0x158(%rax),%rax (gdb) x/x $rbp-0x28 0x7fffff7fefd8: Cannot access memory at address 0x7fffff7fefd8 (gdb) bt 10 #0 0x0000000000413b9d in sym_hash_func (mrb=<error reading variable: Cannot access memory at address 0x7fffff7fefd8>, s=<error reading variable: Cannot access memory at address 0x7fffff7fefd4>) at /home/simo/sources/patch/mruby/src/symbol.c:24 #1 0x0000000000413e4f in kh_get_n2s (mrb=0x6af010, h=0x6bb590, key=0) at /home/simo/sources/patch/mruby/src/symbol.c:37 #2 0x000000000041465d in sym_intern (mrb=0x6af010, name=0x46c25f "__classid__", len=11, lit=1 '\001') at /home/simo/sources/patch/mruby/src/symbol.c:62 #3 0x00000000004148b0 in mrb_intern_static (mrb=0x6af010, name=0x46c25f "__classid__", len=11) at /home/simo/sources/patch/mruby/src/symbol.c:101 #4 0x0000000000404fcb in mrb_class_sym (mrb=0x6af010, c=0x6bb330, outer=0x6b21b0) at /home/simo/sources/patch/mruby/src/variable.c:1174 #5 0x0000000000410bb5 in mrb_class_path (mrb=0x6af010, c=0x6bb330) at /home/simo/sources/patch/mruby/src/class.c:1567 #6 0x0000000000410bf8 in mrb_class_path (mrb=0x6af010, c=0x6b21b0) at /home/simo/sources/patch/mruby/src/class.c:1574 #7 0x0000000000410bf8 in mrb_class_path (mrb=0x6af010, c=0x6bb330) at /home/simo/sources/patch/mruby/src/class.c:1574 #8 0x0000000000410bf8 in mrb_class_path (mrb=0x6af010, c=0x6b21b0) at /home/simo/sources/patch/mruby/src/class.c:1574 #9 0x0000000000410bf8 in mrb_class_path (mrb=0x6af010, c=0x6bb330) at /home/simo/sources/patch/mruby/src/class.c:1574 (More stack frames follow...) (gdb) ```