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DoS attack found in PHP thanks to x87 FP

yuhong (1378501) writes | more than 3 years ago


yuhong writes "Thanks to the fact that in x87 all floating point values stored in registers are 80-bit, a DoS attack has been found where converting the number 2.2250738585072011e-308 using most 32-bit versions of PHP hangs the conversion routine, causing PHP to freeze."
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Cutting to the chase (1)

daemonburrito (1026186) | more than 3 years ago | (#34763924)

Here is Lerdorf's comment on the ticket [] .

This is a well-known, ancient IA-32 or gcc bug (depending on who you ask), and doesn't have much to do with PHP specifically.

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