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SubjectRe: [PATCH] arm64: Stop printing the virtual memory layout
On Tue, Dec 19, 2017 at 11:28 AM, Laura Abbott <labbott@redhat.com> wrote:
> Printing kernel addresses should be done in limited circumstances, mostly
> for debugging purposes. Printing out the virtual memory layout at every
> kernel bootup doesn't really fall into this category so delete the prints.
> There are other ways to get the same information.

In looking at this patch, I wonder: is there anything listed here that
is _missing_ from CONFIG_PTDUMP? I would expect all of these to
already be listed there, but I thought I'd ask...

Regardless:

Acked-by: Kees Cook <keescook@chromium.org>

-Kees

>
> Signed-off-by: Laura Abbott <labbott@redhat.com>
> ---
> Follow up to my previous proposal to switch all these to %px
> ---
> arch/arm64/mm/init.c | 43 -------------------------------------------
> 1 file changed, 43 deletions(-)
>
> diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
> index 5960bef0170d..672094ed7e07 100644
> --- a/arch/arm64/mm/init.c
> +++ b/arch/arm64/mm/init.c
> @@ -599,49 +599,6 @@ void __init mem_init(void)
>
> mem_init_print_info(NULL);
>
> -#define MLK(b, t) b, t, ((t) - (b)) >> 10
> -#define MLM(b, t) b, t, ((t) - (b)) >> 20
> -#define MLG(b, t) b, t, ((t) - (b)) >> 30
> -#define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
> -
> - pr_notice("Virtual kernel memory layout:\n");
> -#ifdef CONFIG_KASAN
> - pr_notice(" kasan : 0x%16lx - 0x%16lx (%6ld GB)\n",
> - MLG(KASAN_SHADOW_START, KASAN_SHADOW_END));
> -#endif
> - pr_notice(" modules : 0x%16lx - 0x%16lx (%6ld MB)\n",
> - 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",
> - MLK_ROUNDUP(_text, _etext));
> - pr_notice(" .rodata : 0x%p" " - 0x%p" " (%6ld KB)\n",
> - MLK_ROUNDUP(__start_rodata, __init_begin));
> - pr_notice(" .init : 0x%p" " - 0x%p" " (%6ld KB)\n",
> - MLK_ROUNDUP(__init_begin, __init_end));
> - pr_notice(" .data : 0x%p" " - 0x%p" " (%6ld KB)\n",
> - MLK_ROUNDUP(_sdata, _edata));
> - pr_notice(" .bss : 0x%p" " - 0x%p" " (%6ld KB)\n",
> - MLK_ROUNDUP(__bss_start, __bss_stop));
> - pr_notice(" fixed : 0x%16lx - 0x%16lx (%6ld KB)\n",
> - MLK(FIXADDR_START, FIXADDR_TOP));
> - pr_notice(" PCI I/O : 0x%16lx - 0x%16lx (%6ld MB)\n",
> - MLM(PCI_IO_START, PCI_IO_END));
> -#ifdef CONFIG_SPARSEMEM_VMEMMAP
> - pr_notice(" vmemmap : 0x%16lx - 0x%16lx (%6ld GB maximum)\n",
> - MLG(VMEMMAP_START, VMEMMAP_START + VMEMMAP_SIZE));
> - pr_notice(" 0x%16lx - 0x%16lx (%6ld MB actual)\n",
> - MLM((unsigned long)phys_to_page(memblock_start_of_DRAM()),
> - (unsigned long)virt_to_page(high_memory)));
> -#endif
> - pr_notice(" memory : 0x%16lx - 0x%16lx (%6ld MB)\n",
> - MLM(__phys_to_virt(memblock_start_of_DRAM()),
> - (unsigned long)high_memory));
> -
> -#undef MLK
> -#undef MLM
> -#undef MLK_ROUNDUP
> -
> /*
> * Check boundaries twice: Some fundamental inconsistencies can be
> * detected at build time already.
> --
> 2.14.3
>



--
Kees Cook
Pixel Security

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