linux-kernel - Re: [PATCH 4/4] export the kernel image size KERNEL_IMAGE

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Message-ID: <CAGXu5jKbsosXC2VRedP4ykezbbDebkEXwaP4Cxxuoev259Bc1g@mail.gmail.com>
Date:	Fri, 5 Sep 2014 10:00:08 -0700
From:	Kees Cook <keescook@...omium.org>
To:	Baoquan He <bhe@...hat.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andi Kleen <ak@...ux.intel.com>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Deutschmann <whissi@...ssi.de>,
	Dave Young <dyoung@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Vivek Goyal <vgoyal@...hat.com>,
	WANG Chao <chaowang@...hat.com>
Subject: Re: [PATCH 4/4] export the kernel image size KERNEL_IMAGE_SIZE

On Fri, Sep 5, 2014 at 7:08 AM, Baoquan He <bhe@...hat.com> 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@...hat.com>
> ---
>  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@...omium.org>

-Kees

-- 
Kees Cook
Chrome OS Security
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