Bug 275528 – SEGV YarrJIT.h:350:28

• Component: JavaScriptCore
• Status: RESOLVED FIXED

Step:

./jsc ./poc.js


ASAN:

==40829==ERROR: UndefinedBehaviorSanitizer: SEGV on unknown address 0x562a749076de (pc 0x7fbad4c28159 bp 0x7ffc6f134250 sp 0x7ffc6f1341b8 T40829)
==40829==The signal is caused by a READ memory access.
    #0 0x7fbad4c28159  (<unknown module>)
    #1 0x562875470c61 in JSC::Yarr::YarrCodeBlock::execute(std::span<char16_t const, 18446744073709551615ul>, unsigned int, int*, JSC::Yarr::MatchingContextHolder*) /home/fuzzer/webkit_fuzzing/WebKit-main/Source/JavaScriptCore/yarr/YarrJIT.h:350:28
    #2 0x562875470c61 in int JSC::RegExp::matchInline<WTF::Vector<int, 32ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>, (JSC::Yarr::MatchFrom)0>(JSC::JSGlobalObject*, JSC::VM&, WTF::String const&, unsigned int, WTF::Vector<int, 32ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>&) /home/fuzzer/webkit_fuzzing/WebKit-main/Source/JavaScriptCore/runtime/RegExpInlines.h:144:43

UndefinedBehaviorSanitizer can not provide additional info.
SUMMARY: UndefinedBehaviorSanitizer: SEGV (<unknown module>)

[Radar WebKit Bug Importer]

<rdar://problem/129910892>

poc.js:


```
/[a]/iu.test("₠a");
const v4 = /[a]/iu;
v4.test("₠A");
/[A]/iu.test("₠a");
/[A]/iu.test("₠A");
const v13 = /[\u00e5]/i;
v13.test("Å");
/[\u212b]/dyiu.test("Å");
/[\u212b]/i.test("å");
const v21 = ("Å").toLowerCase();
v21 == "å";
("Å").toLowerCase();
v21 == "å";
("Å").toUpperCase();
"Å" == "å";
const v32 = /\u00e5/iu;
v32.test("Å");
/\u00e5/iu.test("Å");
/\u00e5/iu.test("å");
v4.test("Å");
/\u00c5/iu.test("Å");
/\u00c5/iu.test("Å");
/\u00c5/iu.test("å");
/\u212b/iu.test("Å");
v4.test("Å");
/\u{10400}/i.test("𐐨");
/\ud801\udc00/iu.test("𐐨");
v13.test("𐐀");
/[\ud801\udc28]/iu.test("𐐀");
["Ａ𐐀"];
v32.test("ἅι");
/(.)\1\1/iu.exec("Ａ𐐀abc");
/(.)\1/iu.exec("𑢪𑣊");
/^\u017F/iu.exec();
/^\u017F/iu;
gc();
print(1111)

```

[Michael Saboff]

Pull request: https://github.com/apple/WebKit/pull/1343

[Michael Saboff]

*** Bug 276046 has been marked as a duplicate of this bug. ***

[Michael Saboff]

Pull request: https://github.com/WebKit/WebKit/pull/30360

[EWS]

Committed 280563@main (8802eec90fd4): <https://commits.webkit.org/280563@main>

Reviewed commits have been landed. Closing PR #30360 and removing active labels.