linux-kernel - Re: [PATCH v18 2/5] random: add vgetrandom

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Date: Thu, 20 Jun 2024 14:18:17 +0200
From: "Jason A. Donenfeld" <Jason@...c4.com>
To: Aleksa Sarai <cyphar@...har.com>
Cc: linux-kernel@...r.kernel.org, patches@...ts.linux.dev,
	tglx@...utronix.de, linux-crypto@...r.kernel.org,
	linux-api@...r.kernel.org, x86@...nel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Adhemerval Zanella Netto <adhemerval.zanella@...aro.org>,
	Carlos O'Donell <carlos@...hat.com>,
	Florian Weimer <fweimer@...hat.com>, Arnd Bergmann <arnd@...db.de>,
	Jann Horn <jannh@...gle.com>,
	Christian Brauner <brauner@...nel.org>,
	David Hildenbrand <dhildenb@...hat.com>
Subject: Re: [PATCH v18 2/5] random: add vgetrandom_alloc() syscall

Hey Aleksa,

On Wed, Jun 19, 2024 at 07:13:26PM -0700, Aleksa Sarai wrote:
> Then again, I guess since libc is planned to be the primary user,
> creating a new syscall in a decade if necessary is probably not that big
> of an issue.

I'm not sure going the whole big struct thing is really necessary, and
for an additional reason: this is only meant to be used with the vDSO
function, which is also coupled with the kernel. It doesn't return
information that's made to be used (or allowed to be used) anywhere
else. So both the vdso code and the syscall code are part of the same
basic thing that will evolve together. So I'm not convinced extensible
struct really makes sense for this, as neat as it is.

If there's wide consensus that it's desirable, in contrast to what I'm
saying, I'm not vehemently opposed to it and could do it, but it just
seems like massive overkill and not at all necessary. Things are
intentionally as simple and straightforward as can be.

Jason