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cesanta / mjs

Embedded JavaScript engine for C/C++
https://mongoose-os.com
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SEGV /mjs/mjs.c:7260 in mjs_print #259

Open Vincebye opened 3 months ago

Vincebye commented 3 months ago

Environment

Ubuntu 22.04.3 LTS

Affected Version

MJS 2.20.0

Step to reproduce

cd mjs 
git checkout b1b6eac6b1e5b830a5cb14f8f4dc690ef3162551 
export LDFLAGS="-lpthread -latomic" 
./afl-clang -DMJS_MAIN mjs.c -fno-inline -ldl -o mjs-bin -fsanitize=address -g 
./mjs-bin -f poc.js

Contents of PoCfile

print+=2;
print("SSSA");

ASAN Report


$ ./mjs-bin poc2.js
AddressSanitizer:DEADLYSIGNAL
=================================================================
==24596==ERROR: AddressSanitizer: SEGV on unknown address (pc 0x56461f7e9172 bp 0x7fff70958cb0 sp 0x7fff70958998 T0)
==24596==The signal is caused by a READ memory access.
==24596==Hint: this fault was caused by a dereference of a high value address (see register values below).  Disassemble the provided pc to learn which register was used.
    #0 0x56461f7e9172 in mjs_print /home/v/jse/mjs/mjs.c:7260
    #1 0x56461f7ff408 in mjs_execute /home/v/jse/mjs/mjs.c:8824:11
    #2 0x56461f7f44d4 in mjs_exec_internal /home/v/jse/mjs/mjs.c:9044:5
    #3 0x56461f7f4cb3 in mjs_exec_file /home/v/jse/mjs/mjs.c:9067:11
    #4 0x56461f8065e8 in main /home/v/jse/mjs/mjs.c:11423:11
    #5 0x7fc20262fd8f in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16
    #6 0x7fc20262fe3f in __libc_start_main csu/../csu/libc-start.c:392:3
    #7 0x56461f6d83d4 in _start (/home/v/jse/mjs/mjs-bin+0x283d4)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV /home/v/jse/mjs/mjs.c:7260 in mjs_print
==24596==ABORTING