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Message-ID: <be147208-ef53-44b8-8644-9f9048bb7e4f@linaro.org>
Date: Fri, 25 Jul 2025 09:48:13 -0300
From: Adhemerval Zanella Netto <adhemerval.zanella@...aro.org>
To: "Jason A. Donenfeld" <Jason@...c4.com>
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 25/07/25 09:28, Jason A. Donenfeld wrote:
> 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.
So I stand corrected.
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