linux-kernel - Re: [PATCH v4 4/4] x86/boot/KASLR: Limit kaslr to choosing the immovable memory

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Date:   Thu, 2 Aug 2018 14:00:53 +0800
From:   Chao Fan <fanc.fnst@...fujitsu.com>
To:     Dou Liyang <douly.fnst@...fujitsu.com>
CC:     <linux-kernel@...r.kernel.org>, <x86@...nel.org>, <hpa@...or.com>,
        <tglx@...utronix.de>, <mingo@...hat.com>, <bhe@...hat.com>,
        <keescook@...omium.org>, <yasu.isimatu@...il.com>,
        <indou.takao@...fujitsu.com>, <caoj.fnst@...fujitsu.com>
Subject: Re: [PATCH v4 4/4] x86/boot/KASLR: Limit kaslr to choosing the
 immovable memory

On Thu, Aug 02, 2018 at 01:46:29PM +0800, Dou Liyang wrote:
>Hi Fan,
>
>At 07/23/2018 05:29 PM, Chao Fan wrote:
>> If 'CONFIG_MEMORY_HOTREMOVE' specified and the account of immovable
>> memory regions is not zero. Calculate the intersection between memory
>> regions from e820/efi memory table and immovable memory regions.
>> Or go on the old code.
>> 
>> Rename process_mem_region to slots_count to match slots_fetch_random,
>> and name new function as process_mem_region.
>> 
>> Signed-off-by: Chao Fan <fanc.fnst@...fujitsu.com>
>> ---
>>   arch/x86/boot/compressed/kaslr.c | 66 ++++++++++++++++++++++++++------
>>   1 file changed, 55 insertions(+), 11 deletions(-)
>> 
>> diff --git a/arch/x86/boot/compressed/kaslr.c b/arch/x86/boot/compressed/kaslr.c
>> index 4705682caf1f..10bda3a1fcaa 100644
>> --- a/arch/x86/boot/compressed/kaslr.c
>> +++ b/arch/x86/boot/compressed/kaslr.c
>> @@ -631,9 +631,9 @@ static unsigned long slots_fetch_random(void)
>>   	return 0;
>>   }
>> -static void process_mem_region(struct mem_vector *entry,
>> -			       unsigned long minimum,
>> -			       unsigned long image_size)
>> +static void slots_count(struct mem_vector *entry,
>               ^^^^^^^^^^^
>                          is not suitable.
>IMO, how about process_mem_slots() or you may have a better name, it's
>up to you.

It's from Kees Cook's advise, he wants to ues slots_count() to match
slots_fetch_random() in my old PATCH long long ago.
Since the method of handling this part is not changed a lot, so I keep
this name.

>
>> +			unsigned long minimum,
>> +			unsigned long image_size)
>>   {
>>   	struct mem_vector region, overlap;
>>   	struct slot_area slot_area;
>
>slot_area is also unused.

Yes, I will make a PATCH to do the clean jobs.

Thanks,
Chao Fan

>
>Thanks,
>	dou
>