PoC ------------------- Attached as test.rb Debug - mirb ------------------- x@x:~/Desktop/test/mruby/bin$ gdb -q ./mirb r Reading symbols from ./mirb...done. (gdb) r test.rb Starting program: /home/x/Desktop/test/mruby/bin/mirb test.rb mirb - Embeddable Interactive Ruby Shell NoMethodError: undefined method 'n' for main NoMethodError: undefined method 'b' for main => nil (mirb):4: uninitialized constant Fo (NameError) => nil => [8, 2] NoMethodError: undefined method '>>' for nil NoMethodError: undefined method 'n' for main NoMethodError: undefined method '�' for main => 1 NoMethodError: undefined method 't' for main NoMethodError: undefined method 'e' for main => "" NoMethodError: undefined method '�' for main NoMethodError: undefined method 'nit' for main NoMethodError: undefined method ' for main NoMethodError: undefined method 'r' for nil NoMethodError: undefined method '�' for main => # NoMethodError: undefined method 'r' for nil => nil NoMethodError: undefined method 's' for # => nil => nil NoMethodError: super called outside of method => nil line 29: syntax error, unexpected tAMPER, expecting keyword_end => # => nil => [#] => nil NoMethodError: undefined method 'array' for main NoMethodError: undefined method 'it' for main => nil NoMethodError: undefined method 'block' for main line 41: syntax error, unexpected keyword_end NoMethodError: super called outside of method => nil => :b => nil NoMethodError: undefined method 'it' for main line 48: syntax error, unexpected keyword_end => nil => nil => nil NoMethodError: undefined method 'attr_reader' for main => nil => [#] => nil line 68: syntax error, unexpected tCONSTANT, expecting keyword_end => [#] => nil => [#] => # *** Error in `/home/x/Desktop/test/mruby/bin/mirb': corrupted double-linked list: 0x00000000007b8360 *** Program received signal SIGABRT, Aborted. 0x00007ffff7744f79 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56 56 ../nptl/sysdeps/unix/sysv/linux/raise.c: No such file or directory. Backtrace - mirb ------------------- (gdb) bt #0 0x00007ffff7744f79 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56 #1 0x00007ffff7748388 in __GI_abort () at abort.c:89 #2 0x00007ffff77821d4 in __libc_message (do_abort=do_abort@entry=1, fmt=fmt@entry=0x7ffff7890a10 "*** Error in `%s': %s: 0x%s ***\n") at ../sysdeps/posix/libc_fatal.c:175 #3 0x00007ffff778cf37 in malloc_printerr (action=, str=0x7ffff788cae6 "corrupted double-linked list", ptr=) at malloc.c:4996 #4 0x00007ffff778e5e7 in _int_free (av=0x7ffff7acd760 , p=, have_lock=1) at malloc.c:3996 #5 0x00007ffff77906d0 in _int_realloc (av=0x7ffff7acd760 , oldp=0x7b1f50, oldsize=25616, nb=27664) at malloc.c:4340 #6 0x00007ffff7791e09 in __GI___libc_realloc (oldmem=0x7b1f60, bytes=27648) at malloc.c:3029 #7 0x000000000042ce50 in mrb_default_allocf (mrb=0x6b0010, p=0x7b1f60, size=27648, ud=0x0) at /home/x/Desktop/test/mruby/src/state.c:60 #8 0x0000000000434ff2 in mrb_realloc_simple (mrb=0x6b0010, p=0x7b1f60, len=27648) at /home/x/Desktop/test/mruby/src/gc.c:201 #9 0x0000000000435074 in mrb_realloc (mrb=0x6b0010, p=0x7b1f60, len=27648) at /home/x/Desktop/test/mruby/src/gc.c:215 #10 0x0000000000406489 in stack_extend_alloc (mrb=0x6b0010, room=2, keep=0) at /home/x/Desktop/test/mruby/src/vm.c:161 #11 0x000000000040659d in stack_extend (mrb=0x6b0010, room=2, keep=0) at /home/x/Desktop/test/mruby/src/vm.c:181 #12 0x00000000004072a6 in mrb_funcall_with_block (mrb=0x6b0010, self=..., mid=8, argc=0, argv=0x7fffffffbb40, blk=...) at /home/x/Desktop/test/mruby/src/vm.c:409 #13 0x0000000000432a75 in mrb_class_new_class (mrb=0x6b0010, cv=...) at /home/x/Desktop/test/mruby/src/class.c:1459 #14 0x000000000040a162 in mrb_vm_exec (mrb=0x6b0010, proc=0x6b7300, pc=0x7322e8) at /home/x/Desktop/test/mruby/src/vm.c:1264 #15 0x000000000040847f in mrb_vm_run (mrb=0x6b0010, proc=0x6b7300, self=..., stack_keep=3) at /home/x/Desktop/test/mruby/src/vm.c:820 #16 0x000000000041084a in mrb_run (mrb=0x6b0010, proc=0x6b7300, self=...) at /home/x/Desktop/test/mruby/src/vm.c:2606 #17 0x000000000040802b in mrb_yield_with_class (mrb=0x6b0010, b=..., argc=1, argv=0x7fffffffc260, self=..., c=0x6b71e0) at /home/x/Desktop/test/mruby/src/vm.c:701 #18 0x0000000000431d5e in mrb_mod_initialize (mrb=0x6b0010, mod=...) at /home/x/Desktop/test/mruby/src/class.c:1148 #19 0x0000000000407567 in mrb_funcall_with_block (mrb=0x6b0010, self=..., mid=8, argc=0, argv=0x0, blk=...) at /home/x/Desktop/test/mruby/src/vm.c:444 #20 0x0000000000432842 in mrb_instance_new (mrb=0x6b0010, cv=...) at /home/x/Desktop/test/mruby/src/class.c:1413 #21 0x000000000040a162 in mrb_vm_exec (mrb=0x6b0010, proc=0x702d40, pc=0x7278ec) at /home/x/Desktop/test/mruby/src/vm.c:1264 #22 0x000000000040847f in mrb_vm_run (mrb=0x6b0010, proc=0x7018d0, self=..., stack_keep=8) at /home/x/Desktop/test/mruby/src/vm.c:820 #23 0x0000000000402b90 in main (argc=2, argv=0x7fffffffe088) at /home/x/Desktop/test/mruby/mrbgems/mruby-bin-mirb/tools/mirb/mirb.c:549 Clang - mirb ------------------- x@x:~/Desktop/test/mruby/bin$ ASAN_SYMBOLIZER_PATH=//usr/lib/llvm-3.8/bin/llvm-symbolizer ../../clang/mruby/bin/mirb test.rb mirb - Embeddable Interactive Ruby Shell NoMethodError: undefined method 'n' for main NoMethodError: undefined method 'b' for main => nil (mirb):4: uninitialized constant Fo (NameError) => nil => [8, 2] NoMethodError: undefined method '>>' for nil NoMethodError: undefined method 'n' for main NoMethodError: undefined method '�' for main => 1 NoMethodError: undefined method 't' for main NoMethodError: undefined method 'e' for main => "" NoMethodError: undefined method '�' for main NoMethodError: undefined method 'nit' for main NoMethodError: undefined method ' for main NoMethodError: undefined method 'r' for nil NoMethodError: undefined method '�' for main => # NoMethodError: undefined method 'r' for nil => nil NoMethodError: undefined method 's' for # => nil => nil NoMethodError: super called outside of method => nil line 29: syntax error, unexpected tAMPER, expecting keyword_end => # => nil => [#] => nil NoMethodError: undefined method 'array' for main NoMethodError: undefined method 'it' for main => nil NoMethodError: undefined method 'block' for main line 41: syntax error, unexpected keyword_end NoMethodError: super called outside of method => nil => :b => nil NoMethodError: undefined method 'it' for main line 48: syntax error, unexpected keyword_end => nil => nil => nil NoMethodError: undefined method 'attr_reader' for main => nil => [#] => nil line 68: syntax error, unexpected tCONSTANT, expecting keyword_end => [#] => nil => [#] => # ================================================================= ==23545==ERROR: AddressSanitizer: attempting double-free on 0x62b00000e200 in thread T0: #0 0x4c4c7d in realloc (/home/x/Desktop/test/clang/mruby/bin/mirb+0x4c4c7d) #1 0x526295 in mrb_default_allocf /home/x/Desktop/test/clang/mruby/src/state.c:60:12 #2 0x53056c in mrb_realloc_simple /home/x/Desktop/test/clang/mruby/src/gc.c:201:8 #3 0x530724 in mrb_realloc /home/x/Desktop/test/clang/mruby/src/gc.c:215:8 #4 0x50272c in stack_extend_alloc /home/x/Desktop/test/clang/mruby/src/vm.c:161:33 #5 0x4f8bcb in stack_extend /home/x/Desktop/test/clang/mruby/src/vm.c:181:5 #6 0x4f96e3 in mrb_yield_with_class /home/x/Desktop/test/clang/mruby/src/vm.c:689:5 #7 0x52e1fe in mrb_class_initialize /home/x/Desktop/test/clang/mruby/src/class.c:1440:5 #8 0x4f85e9 in mrb_funcall_with_block /home/x/Desktop/test/clang/mruby/src/vm.c:444:13 #9 0x52e076 in mrb_class_new_class /home/x/Desktop/test/clang/mruby/src/class.c:1460:5 #10 0x4fb6ca in mrb_vm_exec /home/x/Desktop/test/clang/mruby/src/vm.c:1267:18 #11 0x4f9a1e in mrb_vm_run /home/x/Desktop/test/clang/mruby/src/vm.c:823:10 #12 0x4f8ca3 in mrb_run /home/x/Desktop/test/clang/mruby/src/vm.c:2611:12 #13 0x4f9846 in mrb_yield_with_class /home/x/Desktop/test/clang/mruby/src/vm.c:704:11 #14 0x52e787 in mrb_mod_initialize /home/x/Desktop/test/clang/mruby/src/class.c:1149:5 #15 0x4f85e9 in mrb_funcall_with_block /home/x/Desktop/test/clang/mruby/src/vm.c:444:13 #16 0x52c16c in mrb_instance_new /home/x/Desktop/test/clang/mruby/src/class.c:1414:3 #17 0x4fb6ca in mrb_vm_exec /home/x/Desktop/test/clang/mruby/src/vm.c:1267:18 #18 0x4f9a1e in mrb_vm_run /home/x/Desktop/test/clang/mruby/src/vm.c:823:10 #19 0x4f3010 in main /home/x/Desktop/test/clang/mruby/mrbgems/mruby-bin-mirb/tools/mirb/mirb.c:549:18 #20 0x7f58dcc91ec4 in __libc_start_main /build/buildd/eglibc-2.19/csu/libc-start.c:287 #21 0x41a575 in _start (/home/x/Desktop/test/clang/mruby/bin/mirb+0x41a575) 0x62b00000e200 is located 0 bytes inside of 27648-byte region [0x62b00000e200,0x62b000014e00) freed by thread T0 here: #0 0x4c4590 in free (/home/x/Desktop/test/clang/mruby/bin/mirb+0x4c4590) #1 0x52627b in mrb_default_allocf /home/x/Desktop/test/clang/mruby/src/state.c:56:5 #2 0x5309dc in mrb_free /home/x/Desktop/test/clang/mruby/src/gc.c:268:3 #3 0x526923 in mrb_free_context /home/x/Desktop/test/clang/mruby/src/state.c:226:3 #4 0x530e9c in obj_free /home/x/Desktop/test/clang/mruby/src/gc.c:769:9 #5 0x532ce7 in incremental_sweep_phase /home/x/Desktop/test/clang/mruby/src/gc.c:1030:11 #6 0x532651 in incremental_gc /home/x/Desktop/test/clang/mruby/src/gc.c:1096:20 #7 0x5319a6 in incremental_gc_until /home/x/Desktop/test/clang/mruby/src/gc.c:1112:5 #8 0x53167e in mrb_incremental_gc /home/x/Desktop/test/clang/mruby/src/gc.c:1163:5 #9 0x531508 in mrb_obj_alloc /home/x/Desktop/test/clang/mruby/src/gc.c:507:5 #10 0x507207 in mrb_proc_new /home/x/Desktop/test/clang/mruby/src/proc.c:22:22 #11 0x5072bc in mrb_closure_new /home/x/Desktop/test/clang/mruby/src/proc.c:69:21 #12 0x500d1e in mrb_vm_exec /home/x/Desktop/test/clang/mruby/src/vm.c:2403:13 #13 0x4f9a1e in mrb_vm_run /home/x/Desktop/test/clang/mruby/src/vm.c:823:10 #14 0x4f3010 in main /home/x/Desktop/test/clang/mruby/mrbgems/mruby-bin-mirb/tools/mirb/mirb.c:549:18 #15 0x7f58dcc91ec4 in __libc_start_main /build/buildd/eglibc-2.19/csu/libc-start.c:287 previously allocated by thread T0 here: #0 0x4c4c7d in realloc (/home/x/Desktop/test/clang/mruby/bin/mirb+0x4c4c7d) #1 0x526295 in mrb_default_allocf /home/x/Desktop/test/clang/mruby/src/state.c:60:12 #2 0x53056c in mrb_realloc_simple /home/x/Desktop/test/clang/mruby/src/gc.c:201:8 #3 0x530724 in mrb_realloc /home/x/Desktop/test/clang/mruby/src/gc.c:215:8 #4 0x50272c in stack_extend_alloc /home/x/Desktop/test/clang/mruby/src/vm.c:161:33 #5 0x4f8bcb in stack_extend /home/x/Desktop/test/clang/mruby/src/vm.c:181:5 #6 0x4f8314 in mrb_funcall_with_block /home/x/Desktop/test/clang/mruby/src/vm.c:409:7 #7 0x52e076 in mrb_class_new_class /home/x/Desktop/test/clang/mruby/src/class.c:1460:5 #8 0x4fb6ca in mrb_vm_exec /home/x/Desktop/test/clang/mruby/src/vm.c:1267:18 #9 0x4f9a1e in mrb_vm_run /home/x/Desktop/test/clang/mruby/src/vm.c:823:10 #10 0x4f8ca3 in mrb_run /home/x/Desktop/test/clang/mruby/src/vm.c:2611:12 #11 0x4f9846 in mrb_yield_with_class /home/x/Desktop/test/clang/mruby/src/vm.c:704:11 #12 0x52e787 in mrb_mod_initialize /home/x/Desktop/test/clang/mruby/src/class.c:1149:5 #13 0x4f85e9 in mrb_funcall_with_block /home/x/Desktop/test/clang/mruby/src/vm.c:444:13 #14 0x52c16c in mrb_instance_new /home/x/Desktop/test/clang/mruby/src/class.c:1414:3 #15 0x4fb6ca in mrb_vm_exec /home/x/Desktop/test/clang/mruby/src/vm.c:1267:18 #16 0x4f9a1e in mrb_vm_run /home/x/Desktop/test/clang/mruby/src/vm.c:823:10 #17 0x4f3010 in main /home/x/Desktop/test/clang/mruby/mrbgems/mruby-bin-mirb/tools/mirb/mirb.c:549:18 #18 0x7f58dcc91ec4 in __libc_start_main /build/buildd/eglibc-2.19/csu/libc-start.c:287 SUMMARY: AddressSanitizer: double-free (/home/x/Desktop/test/clang/mruby/bin/mirb+0x4c4c7d) in realloc ==23545==ABORTING

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