linux-kernel - Re: [RFC][PATCH] arm64: Switch to %px for printing some addresses at bootup

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Message-ID: <CAGXu5jK1H1+VSENq9uVGJsqOkB42WvZuRviyPpSmgywUmXte8A@mail.gmail.com>
Date:   Thu, 14 Dec 2017 14:51:39 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Laura Abbott <labbott@...hat.com>
Cc:     Will Deacon <will.deacon@....com>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        linux-arm-kernel@...ts.infradead.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH] arm64: Switch to %px for printing some addresses at bootup

On Thu, Dec 14, 2017 at 2:39 PM, Laura Abbott <labbott@...hat.com> wrote:
> With the move to stricter %p printing, several of the addresses
> are no longer printed out. Switch to %px so they always get printed.
>
> Signed-off-by: Laura Abbott <labbott@...hat.com>
> ---
> I'll admit to finding the new %p restrictions particularly irritating
> here because I like seeing the print out of the virtual addresses for
> debugging and checking. It might also be worth discussing whether we
> should be printing anything out?

If they're always printed at boot, I think they should likely be removed...

-Kees

> ---
>  arch/arm64/mm/init.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
> index 5960bef0170d..9be53e050f50 100644
> --- a/arch/arm64/mm/init.c
> +++ b/arch/arm64/mm/init.c
> @@ -613,15 +613,15 @@ void __init mem_init(void)
>                 MLM(MODULES_VADDR, MODULES_END));
>         pr_notice("    vmalloc : 0x%16lx - 0x%16lx   (%6ld GB)\n",
>                 MLG(VMALLOC_START, VMALLOC_END));
> -       pr_notice("      .text : 0x%p" " - 0x%p" "   (%6ld KB)\n",
> +       pr_notice("      .text : 0x%px" " - 0x%px" "   (%6ld KB)\n",
>                 MLK_ROUNDUP(_text, _etext));
> -       pr_notice("    .rodata : 0x%p" " - 0x%p" "   (%6ld KB)\n",
> +       pr_notice("    .rodata : 0x%px" " - 0x%px" "   (%6ld KB)\n",
>                 MLK_ROUNDUP(__start_rodata, __init_begin));
> -       pr_notice("      .init : 0x%p" " - 0x%p" "   (%6ld KB)\n",
> +       pr_notice("      .init : 0x%px" " - 0x%px" "   (%6ld KB)\n",
>                 MLK_ROUNDUP(__init_begin, __init_end));
> -       pr_notice("      .data : 0x%p" " - 0x%p" "   (%6ld KB)\n",
> +       pr_notice("      .data : 0x%px" " - 0x%px" "   (%6ld KB)\n",
>                 MLK_ROUNDUP(_sdata, _edata));
> -       pr_notice("       .bss : 0x%p" " - 0x%p" "   (%6ld KB)\n",
> +       pr_notice("       .bss : 0x%px" " - 0x%px" "   (%6ld KB)\n",
>                 MLK_ROUNDUP(__bss_start, __bss_stop));
>         pr_notice("    fixed   : 0x%16lx - 0x%16lx   (%6ld KB)\n",
>                 MLK(FIXADDR_START, FIXADDR_TOP));
> --
> 2.14.3
>



-- 
Kees Cook
Pixel Security