[PATCH] stdlib: Remove possible bias in arc4random_uniform

[Adhemerval Zanella Netto]

On 02/08/22 09:25, Adhemerval Zanella wrote:
> It turned out that the shift optimziation to reuse the discarded bits
> might introduce bias [1].  This patch removes is and just issue another
> round if the condition can not be satisfied.
> 
> Checked on x86_64-linux-gnu.
> 
> [1] https://crypto.stackexchange.com/questions/101325/uniform-rejection-sampling-by-shifting-or-rotating-bits-from-csprng-output-safe

I understand wrongly the question on the crypto.stackexchange, the issues is to
reuse the already discarded bits after the test, which is not the case in glibc
implementation.