SEGV Xs/sources/xsFunction.c:546:18 In ... - GitHub

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Moddable-XS revision

Commit: 2f93df29

Version: 11.5.0 32 4

Build environment

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

Build steps
cd ~/moddable/xs/makefiles/lin make -f xst.mk
Test case
poc.js function JSEtest() { }; JSEtest.prototype = Function.prototype; var obj = new JSEtest; try { obj.apply(); $ERROR('###'); } catch (e) { if (!(e instanceof new JSEtest)) { $ERROR('###'); } }
Execution & Output
$ ./moddable/build/bin/lin/debug/xst poc.js AddressSanitizer:DEADLYSIGNAL ================================================================= ==16775==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x00000069f0da bp 0x7ffc5bbdaf10 sp 0x7ffc5bbdac70 T0) ==16775==The signal is caused by a READ memory access. ==16775==Hint: address points to the zero page. #0 0x69f0d9 in fx_Function_prototype_hasInstance /root/moddable/xs/sources/xsFunction.c:546:18 #1 0x84f3ca in fxRunID /root/moddable/xs/sources/xsRun.c:842:7 #2 0x8c98c0 in fxRunInstanceOf /root/moddable/xs/sources/xsRun.c:4396:2 #3 0x8bac67 in fxRunID /root/moddable/xs/sources/xsRun.c:3877:4 #4 0x8ceaac in fxRunScript /root/moddable/xs/sources/xsRun.c:4766:4 #5 0xad3231 in fxRunProgramFile /root/moddable/xs/tools/xst.c:1387:2 #6 0xacfa83 in main /root/moddable/xs/tools/xst.c:281:8 #7 0x7f729fce6bf6 in __libc_start_main /build/glibc-S9d2JN/glibc-2.27/csu/../csu/libc-start.c:310 #8 0x42ddc9 in _start (/usr/local/bin/xst+0x42ddc9) AddressSanitizer can not provide additional info. SUMMARY: AddressSanitizer: SEGV /root/moddable/xs/sources/xsFunction.c:546:18 in fx_Function_prototype_hasInstance ==16775==ABORTING

Credits: Found by OWL337 team.

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