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Message-ID: <848ed24c-13ef-6c38-fd13-639b33809194@csgroup.eu>
Date:   Thu, 6 Oct 2022 17:21:27 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     "Jason A. Donenfeld" <Jason@...c4.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "patches@...ts.linux.dev" <patches@...ts.linux.dev>
CC:     Andreas Noever <andreas.noever@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Borislav Petkov <bp@...en8.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Christoph Böhmwalder 
        <christoph.boehmwalder@...bit.com>, Christoph Hellwig <hch@....de>,
        Daniel Borkmann <daniel@...earbox.net>,
        Dave Airlie <airlied@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Florian Westphal <fw@...len.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "H . Peter Anvin" <hpa@...or.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Helge Deller <deller@....de>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Huacai Chen <chenhuacai@...nel.org>,
        Hugh Dickins <hughd@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        "James E . J . Bottomley" <jejb@...ux.ibm.com>,
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        Marco Elver <elver@...gle.com>,
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        Toke Høiland-Jørgensen <toke@...e.dk>,
        Chuck Lever <chuck.lever@...cle.com>, Jan Kara <jack@...e.cz>
Subject: Re: [PATCH v3 3/5] treewide: use get_random_u32() when possible



Le 06/10/2022 à 18:53, Jason A. Donenfeld a écrit :
> The prandom_u32() function has been a deprecated inline wrapper around
> get_random_u32() for several releases now, and compiles down to the
> exact same code. Replace the deprecated wrapper with a direct call to
> the real function. The same also applies to get_random_int(), which is
> just a wrapper around get_random_u32().
> 
> Reviewed-by: Kees Cook <keescook@...omium.org>
> Acked-by: Toke Høiland-Jørgensen <toke@...e.dk> # for sch_cake
> Acked-by: Chuck Lever <chuck.lever@...cle.com> # for nfsd
> Reviewed-by: Jan Kara <jack@...e.cz> # for ext4
> Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>
> ---

> diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
> index 0fbda89cd1bb..9c4c15afbbe8 100644
> --- a/arch/powerpc/kernel/process.c
> +++ b/arch/powerpc/kernel/process.c
> @@ -2308,6 +2308,6 @@ void notrace __ppc64_runlatch_off(void)
>   unsigned long arch_align_stack(unsigned long sp)
>   {
>   	if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
> -		sp -= get_random_int() & ~PAGE_MASK;
> +		sp -= get_random_u32() & ~PAGE_MASK;
>   	return sp & ~0xf;

Isn't that a candidate for prandom_u32_max() ?

Note that sp is deemed to be 16 bytes aligned at all time.


Christophe

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