linux-kernel - Re: [resend Patch v3 2/2] export the kernel image size KERNEL_IMAGE

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Date:	Mon, 02 Feb 2015 15:32:16 +0800
From:	Baoquan He <bhe@...hat.com>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	linux-kernel@...r.kernel.org, mingo@...hat.com, x86@...nel.org,
	vgoyal@...hat.com, keescook@...omium.org, ak@...ux.intel.com,
	ebiederm@...ssion.com, kexec@...ts.infradead.org, whissi@...ssi.de,
	kumagai-atsushi@....nes.nec.co.jp, hpa@...or.com
Subject: Re: [resend Patch v3 2/2] export the kernel image size KERNEL_IMAGE_SIZE


Hi Thomas,

Could you please also merge this patch? Since you have merged this patch
"x86, boot: Skip relocs when load address unchanged [commit f285f4a21]",
and this issue was raised because it broke kexec/kdump, then I posted
these 2 patches. Without this patch makedumpfile will be broken when
enable kaslr and do the kdump.

Thanks
Baouqan

On 09/30/2014 03:08 PM, Baoquan He 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.
> 
> Signed-off-by: Baoquan He <bhe@...hat.com>
> Acked-by: Kees Cook <keescook@...omium.org>
> Acked-by: Vivek Goyal <vgoyal@...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
> 
	
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