Re: [Xen-devel] [PATCH 09/10] x86: check kexec relocation code fits in a page

[Daniel Kiper <daniel.kiper@xxxxxxxxxx>]

On Mon, Jun 24, 2013 at 06:42:20PM +0100, David Vrabel wrote:
> From: David Vrabel <david.vrabel@xxxxxxxxxx>
>
> The kexec relocation (control) code must fit in a single page so add a
> link time check for this.
>
> Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>
> ---
>  xen/arch/x86/xen.lds.S |    4 ++++
>  1 files changed, 4 insertions(+), 0 deletions(-)
>
> diff --git a/xen/arch/x86/xen.lds.S b/xen/arch/x86/xen.lds.S
> index d959941..eebed01 100644
> --- a/xen/arch/x86/xen.lds.S
> +++ b/xen/arch/x86/xen.lds.S
> @@ -186,3 +186,7 @@ SECTIONS
>    .stab.indexstr 0 : { *(.stab.indexstr) }
>    .comment 0 : { *(.comment) }
>  }
> +
> +#ifdef CONFIG_KEXEC
> +ASSERT(__kexec_reloc_size <= PAGE_SIZE, "kexec control code is too large")

ASSERT(kexec_reloc_size <= KEXEC_CONTROL_PAGE_SIZE, "kexec control code is too 
large")

Daniel

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