heap-buffer-overflow at Jsi_DSAppendLen src/jsiDString.c:109

[kvenux]

Build environment:

Ubuntu 16.04
gcc 5.4.0
version: c95c897
build command:
export JSI__SANITIZE=1
make
test command: ./jsish poc

Target device:
Desktop Linux

POC

jsish-1021-000086.txt

Description

Below is the ASAN outputs.

=================================================================
==124748==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60200000c594 at pc 0x7fc9b3851935 bp 0x7ffe05c465a0 sp 0x7ffe05c45d48
READ of size 4 at 0x60200000c594 thread T0
#0 0x7fc9b3851934 in __asan_memcpy (/usr/lib/x86_64-linux-gnu/libasan.so.2+0x8c934)
#1 0x5a2f41 in memcpy /usr/include/x86_64-linux-gnu/bits/string3.h:53
#2 0x5a2f41 in Jsi_DSAppendLen src/jsiDString.c:109
#3 0x5cd571 in Jsi_UtfSubstr src/jsiUtf8.c:130
#4 0x4c517d in StringSubstringCmd src/jsiString.c:193
#5 0x4a82f8 in jsi_FuncCallSub src/jsiProto.c:244
#6 0x72059a in jsiFunctionSubCall src/jsiEval.c:790
#7 0x72059a in jsiEvalFunction src/jsiEval.c:825
#8 0x72059a in jsiEvalCodeSub src/jsiEval.c:1250
#9 0x73335f in jsi_evalcode src/jsiEval.c:2190
#10 0x4a93bd in jsi_FuncCallSub src/jsiProto.c:220
#11 0x720371 in jsiFunctionSubCall src/jsiEval.c:790
#12 0x720371 in jsiEvalFunction src/jsiEval.c:825
#13 0x720371 in jsiEvalCodeSub src/jsiEval.c:1250
#14 0x73335f in jsi_evalcode src/jsiEval.c:2190
#15 0x736037 in jsi_evalStrFile src/jsiEval.c:2496
#16 0x47e0ee in Jsi_Main src/jsiInterp.c:917
#17 0x90be3e in jsi_main src/main.c:44
#18 0x7fc9b2cf183f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2083f)
#19 0x418238 in _start (/home/keven/Fuzzing/jsish-1023/jsish+0x418238)

0x60200000c594 is located 0 bytes to the right of 4-byte region [0x60200000c590,0x60200000c594)
allocated by thread T0 here:
#0 0x7fc9b385d602 in malloc (/usr/lib/x86_64-linux-gnu/libasan.so.2+0x98602)
#1 0x4825c2 in Jsi_Malloc src/jsiUtils.c:52

SUMMARY: AddressSanitizer: heap-buffer-overflow ??:0 __asan_memcpy
Shadow bytes around the buggy address:
0x0c047fff9860: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff9870: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff9880: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff9890: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff98a0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fd fa
=>0x0c047fff98b0: fa fa[04]fa fa fa fd fa fa fa fd fa fa fa fd fd
0x0c047fff98c0: fa fa fd fa fa fa fd fa fa fa fd fa fa fa fd fa
0x0c047fff98d0: fa fa fd fd fa fa fd fa fa fa fd fa fa fa fd fa
0x0c047fff98e0: fa fa fd fa fa fa fd fd fa fa fd fa fa fa fd fa
0x0c047fff98f0: fa fa fd fa fa fa 00 00 fa fa 00 00 fa fa 00 00
0x0c047fff9900: fa fa fd fd fa fa fd fa fa fa fd fa fa fa fd fa
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
Heap right redzone: fb
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack partial redzone: f4
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
==124748==ABORTING