On Mon, Oct 20, 2014 at 04:09:30PM +0200, Daniel Borkmann wrote:
> >
> >It's triggering when input_rotate == 0, so UBSan complains about right shift in rol32()
> >
> >static inline __u32 rol32(__u32 word, unsigned int shift)
> >{
> > return (word << shift) | (word >> (32 - shift));
> >}
>
> So that would be the case when the entropy store's input_rotate calls
> _mix_pool_bytes() for the very first time ... I don't think it's an
> issue though.
I'm sure it's not an issue, but it's still true that
return (word << 0) | (word >> 32);
is technically not undefined, and while it would be unfortunate (and
highly unlikely) if gcc were to say, start nethack, it's technically
allowed by the C spec. :-)
- Ted
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