linux-kernel - Re: [PATCH 6/7] x86, kaslr: report kernel offset on panic

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Date:	Wed, 02 Oct 2013 10:06:01 +0900
From:	HATAYAMA Daisuke <d.hatayama@...fujitsu.com>
To:	Kees Cook <keescook@...omium.org>
CC:	linux-kernel@...r.kernel.org, x86@...nel.org,
	kernel-hardening@...ts.openwall.com, adurbin@...gle.com,
	Eric Northup <digitaleric@...gle.com>, jln@...gle.com,
	wad@...gle.com, Mathias Krause <minipli@...glemail.com>,
	Zhang Yanfei <zhangyanfei@...fujitsu.com>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH 6/7] x86, kaslr: report kernel offset on panic

(2013/10/02 9:38), HATAYAMA Daisuke wrote:
> (2013/10/02 4:37), Kees Cook wrote:
<cut>
>> @@ -1242,3 +1256,15 @@ void __init i386_reserve_resources(void)
>>    }
>>    
>>    #endif /* CONFIG_X86_32 */
>> +
>> +static struct notifier_block kernel_offset_notifier = {
>> +	.notifier_call = dump_kernel_offset
>> +};
>> +
>> +static int __init register_kernel_offset_dumper(void)
>> +{
>> +	atomic_notifier_chain_register(&panic_notifier_list,
>> +					&kernel_offset_notifier);
>> +	return 0;
>> +}
>> +__initcall(register_kernel_offset_dumper);
>>
> 
> Panic notifier is not executed if kdump is enabled. Maybe, Chrome OS doesn't use
> kdump? Anyway, kdump related tools now calculate phys_base from memory map
> information passed as ELF PT_LOAD entries like below.

Another simpler way is to print this information at boot time, not at panic.

-- 
Thanks.
HATAYAMA, Daisuke

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