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

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Date: Mon, 1 Jul 2024 13:53:04 +0200
From: "Jason A. Donenfeld" <Jason@...c4.com>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: Aleksa Sarai <cyphar@...har.com>, linux-kernel@...r.kernel.org,
	patches@...ts.linux.dev, 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

On Fri, Jun 28, 2024 at 04:09:01PM +0200, Jason A. Donenfeld wrote:
> fine. Also I used u32 there for the two smaller arguments, but maybe
> that's silly and we should go straight to u64?

Judging by `struct clone_args`, it looks like I've got to use
__aligned_u64 for every argument:

    struct clone_args {
        __aligned_u64 flags;
        __aligned_u64 pidfd;
        __aligned_u64 child_tid;
        __aligned_u64 parent_tid;
        __aligned_u64 exit_signal;
        __aligned_u64 stack;
        __aligned_u64 stack_size;
        __aligned_u64 tls;
        __aligned_u64 set_tid;
        __aligned_u64 set_tid_size;
        __aligned_u64 cgroup;
    };
    #define CLONE_ARGS_SIZE_VER0 64 /* sizeof first published struct */
    #define CLONE_ARGS_SIZE_VER1 80 /* sizeof second published struct */
    #define CLONE_ARGS_SIZE_VER2 88 /* sizeof third published struct */
    
So okay, I'll do that, and will have an ARGS_SIZE_VER0 macro too.

Jason