Fix GH-21731: Random\Engine\Xoshiro256StarStar::__unserialize() accepts all-zero state#32
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Fix GH-21731: Random\Engine\Xoshiro256StarStar::__unserialize() accepts all-zero state#32
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…cepts all-zero state The constructor rejects a seed that would leave the internal state all zero, because xoshiro256** with zero state produces 0 on every call forever. The unserialize callback didn't check the same invariant. A caller feeding a crafted serialized payload through __unserialize() ended up with a live engine that returned 0 from every operation. Match the constructor: reject the all-zero state from the unserialize callback too. The Mt19937-aliased __unserialize() wrapper turns the false return into the standard "Invalid serialization data" exception. Closes phpGH-21731
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Submitted upstream as php#21732 |
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Fixes php#21731.
Random\Engine\Xoshiro256StarStar::__construct()rejects a seed that would leave the internal state all zero, because xoshiro256** with zero state returns0on every call forever. Theunserializecallback didn't check the same invariant. A caller feeding a crafted serialized payload through__unserialize()ended up with a live engine that returned 0 from every operation.Match the constructor: reject the all-zero state from
unserializetoo. The Mt19937-aliased__unserialize()wrapper maps thefalsereturn into the standard "Invalid serialization data for ... object" exception, so the wrapper needs no changes.