integer overflow yields incorrect results and buffer overflow on 64-bit machines
patrick.pelissier at gmail.com
Mon Feb 25 21:11:59 CET 2008
> Unfortunately, changing the _mp_size and _mp_alloc fields to long
> cannot be done without breaking compatibility (the size of the type
> should not change).
> I am pondering some hairy solutions for GMP 5, stealing bits from the
> _mp_alloc field for use in the _mp_size field, and letting the
> remaining _mp_alloc bits be coded as a little home-brew floating point
Don't forget that gmp.h defines many macro functions which access
_mp_size field directly:
mpz_abs / mpz_fits_uint_p / mpz_get_ui / ...
You can't avoid breaking binary compatibility for GMP 5, I think.
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