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Date: Mon, 4 Sep 2017 14:25:13 -0400 (EDT)
From: Nicolas Pitre <nicolas.pitre@...aro.org>
To: Ard Biesheuvel <ard.biesheuvel@...aro.org>
cc: linux-arm-kernel@...ts.infradead.org, kernel-hardening@...ts.openwall.com,
Arnd Bergmann <arnd@...db.de>, Russell King <linux@...linux.org.uk>,
Kees Cook <keescook@...omium.org>, Thomas Garnier <thgarnie@...gle.com>,
Marc Zyngier <marc.zyngier@....com>, Mark Rutland <mark.rutland@....com>,
Tony Lindgren <tony@...mide.com>, Matt Fleming <matt@...eblueprint.co.uk>,
Dave Martin <dave.martin@....com>
Subject: Re: [PATCH v2 22/29] ARM: mm: export default vmalloc base address
On Sun, 3 Sep 2017, Ard Biesheuvel wrote:
> In order for the EFI stub to be able to decide over what range to
> randomize the load address of the kernel, expose the definition of
> the default vmalloc base address as VMALLOC_DEFAULT_BASE.
>
> Cc: Russell King <linux@...linux.org.uk>
> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
Acked-by: Nicolas Pitre <nico@...aro.org>
> ---
> arch/arm/include/asm/pgtable.h | 1 +
> arch/arm/mm/mmu.c | 3 +--
> 2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h
> index 1c462381c225..a0d4a63a6516 100644
> --- a/arch/arm/include/asm/pgtable.h
> +++ b/arch/arm/include/asm/pgtable.h
> @@ -45,6 +45,7 @@
> #define VMALLOC_OFFSET (8*1024*1024)
> #define VMALLOC_START (((unsigned long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
> #define VMALLOC_END 0xff800000UL
> +#define VMALLOC_DEFAULT_BASE (VMALLOC_END - (240 << 20) - VMALLOC_OFFSET)
>
> #define LIBRARY_TEXT_START 0x0c000000
>
> diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
> index e46a6a446cdd..566f7e657931 100644
> --- a/arch/arm/mm/mmu.c
> +++ b/arch/arm/mm/mmu.c
> @@ -1128,8 +1128,7 @@ void __init debug_ll_io_init(void)
> }
> #endif
>
> -static void * __initdata vmalloc_min =
> - (void *)(VMALLOC_END - (240 << 20) - VMALLOC_OFFSET);
> +static void * __initdata vmalloc_min = (void *)VMALLOC_DEFAULT_BASE;
>
> /*
> * vmalloc=size forces the vmalloc area to be exactly 'size'
> --
> 2.11.0
>
>
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