linux-kernel - Re: [PATCH v6 0/7] treewide cleanup of random integer usage

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Message-ID: <20221011160144.1c0dc2af@kernel.org>
Date:   Tue, 11 Oct 2022 16:01:44 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     "Jason A. Donenfeld" <Jason@...c4.com>
Cc:     linux-kernel@...r.kernel.org, patches@...ts.linux.dev,
        Andreas Noever <andreas.noever@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
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        Christoph Böhmwalder 
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Subject: Re: [PATCH v6 0/7] treewide cleanup of random integer usage

On Mon, 10 Oct 2022 17:06:06 -0600 Jason A. Donenfeld wrote:
> - If you want a secure or an insecure random u64, use get_random_u64().
> - If you want a secure or an insecure random u32, use get_random_u32().
>   * The old function prandom_u32() has been deprecated for a while now
>     and is just a wrapper around get_random_u32(). Same for
>     get_random_int().
> - If you want a secure or an insecure random u16, use get_random_u16().
> - If you want a secure or an insecure random u8, use get_random_u8().
> - If you want secure or insecure random bytes, use get_random_bytes().
>   * The old function prandom_bytes() has been deprecated for a while now
>     and has long been a wrapper around get_random_bytes().
> - If you want a non-uniform random u32, u16, or u8 bounded by a certain
>   open interval maximum, use prandom_u32_max().
>   * I say "non-uniform", because it doesn't do any rejection sampling or
>     divisions. Hence, it stays within the prandom_* namespace.

Acked-by: Jakub Kicinski <kuba@...nel.org>