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Message-ID: <CAHmME9rMTnSu-S7ty4G-uMLszZF==Uqwnd2EsZtVE3vVNEk1eQ@mail.gmail.com>
Date: Fri, 25 Jul 2025 14:28:59 +0200
From: "Jason A. Donenfeld" <Jason@...c4.com>
To: Adhemerval Zanella Netto <adhemerval.zanella@...aro.org>
Cc: libc-coord@...ts.openwall.com, Sam James <sam@...too.org>,
Schrodinger ZHU Yifan <i@...yi.fan>
Subject: Re: vdso getrandom is slower than syscall on Zen5
On Fri, Jul 25, 2025 at 2:27 PM Adhemerval Zanella Netto
<adhemerval.zanella@...aro.org> wrote:
>
> 2. The vDSO symbol provided by the kernel has limited optimization
> compared to the one used internally on other Linux crypto subsystems.
This is not true at all. The getrandom() syscall only ever uses the
slow generic C implementation and does not use any of the optimized
code.
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