Re: [PATCH 4/4] export the kernel image size KERNEL_IMAGE_SIZE

[Kees Cook]

On Fri, Sep 5, 2014 at 7:08 AM, Baoquan He <bhe@xxxxxxxxxx> wrote:
> Now kaslr makes kernel image size changable, not the fixed size 512M.
> So KERNEL_IMAGE_SIZE need be exported to VMCOREINFO, otherwise makedumfile
> will crash.

Seems like a good idea, yes.

>
> Signed-off-by: Baoquan He <bhe@xxxxxxxxxx>
> ---
>  kernel/kexec.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/kernel/kexec.c b/kernel/kexec.c
> index 2bee072..bd680d3 100644
> --- a/kernel/kexec.c
> +++ b/kernel/kexec.c
> @@ -2003,6 +2003,9 @@ static int __init crash_save_vmcoreinfo_init(void)
>  #endif
>         VMCOREINFO_NUMBER(PG_head_mask);
>         VMCOREINFO_NUMBER(PAGE_BUDDY_MAPCOUNT_VALUE);
> +#ifdef CONFIG_X86
> +       VMCOREINFO_NUMBER(KERNEL_IMAGE_SIZE);
> +#endif
>  #ifdef CONFIG_HUGETLBFS
>         VMCOREINFO_SYMBOL(free_huge_page);
>  #endif

Acked-by: Kees Cook <keescook@xxxxxxxxxxxx>

-Kees

-- 
Kees Cook
Chrome OS Security
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