WebKit JSC - 'BytecodeGenerator::emitGetByVal' Incorrect Optimization (2)

function f let o = ; for let i in xx: 0 for i of 0 printoi; f;...

WebKit JSC Incorrect Optimization

WebKit: JSC: Incorrect for-in optimization 2 CVE-2017-7117 The following PoC bypasses the fix for the https://bugs.chromium.org/p/project-zero/issues/detail?id=1263 WebKit: JSC: Incorrect optimization in BytecodeGenerator::emitGetByVal PoC: function f let o = ; for let i in xx: 0 for i of 0...

WebKit JSC - BytecodeGenerator::emitGetByVal Incorrect Optimization (1)

WebKit JSC - BytecodeGenerator::emitGetByVal Incorrect Optimization 1 Let's start with JS code. let o = ; for let i in xx: 0 oi; 0; i-- ForInContext& context = mforInContextStacki - 1.get; if context.local != property continue; if !context.isValid break; if context.type ==...