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

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Message-ID: <CAGXu5j+R7zNkt_e29L4EqY1TFdAUiD6XybyRR6=OOb3tT0-1Dg@mail.gmail.com>
Date:	Mon, 9 Feb 2015 12:18:24 -0800
From:	Kees Cook <keescook@...omium.org>
To:	Baoquan He <bhe@...hat.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>,
	"x86@...nel.org" <x86@...nel.org>, Vivek Goyal <vgoyal@...hat.com>,
	Andi Kleen <ak@...ux.intel.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Kexec Mailing List <kexec@...ts.infradead.org>,
	Thomas Deutschmann <whissi@...ssi.de>,
	kumagai-atsushi@....nes.nec.co.jp, "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [resend Patch v3 2/2] export the kernel image size KERNEL_IMAGE_SIZE

Ping?

Can someone pull this into x86 tip?

Thanks!

-Kees


On Sun, Feb 1, 2015 at 11:32 PM, Baoquan He <bhe@...hat.com> wrote:
>
> 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
>>
>



-- 
Kees Cook
Chrome OS Security
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