linux-kernel - Re: [PATCH 1/2] x86: ioremap: fix wrong physical address handling

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 16 Jun 2010 21:22:06 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Matthew Wilcox <matthew@....cx>
CC:	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>,
	tglx@...utronix.de, mingo@...hat.com, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org, macro@...ux-mips.org,
	kamezawa.hiroyu@...fujitsu.com, eike-kernel@...tec.de
Subject: Re: [PATCH 1/2] x86: ioremap: fix wrong physical address handling

On 06/16/2010 07:50 PM, Matthew Wilcox wrote:
> On Thu, Jun 17, 2010 at 10:30:06AM +0900, Kenji Kaneshige wrote:
>> Index: linux-2.6.34/arch/x86/mm/ioremap.c
>> ===================================================================
>> --- linux-2.6.34.orig/arch/x86/mm/ioremap.c	2010-06-15 04:43:00.978332015 +0900
>> +++ linux-2.6.34/arch/x86/mm/ioremap.c	2010-06-15 05:32:59.291693007 +0900
>> @@ -62,8 +62,8 @@
>>   static void __iomem *__ioremap_caller(resource_size_t phys_addr,
>>   		unsigned long size, unsigned long prot_val, void *caller)
>>   {
>> -	unsigned long pfn, offset, vaddr;
>> -	resource_size_t last_addr;
>> +	unsigned long offset, vaddr;
>> +	resource_size_t pfn, last_pfn, last_addr;
>
> I have a hard time understanding this change.  pfn is always a physical
> address shifted by PAGE_SHIFT.  So a 32-bit pfn supports up to 44-bit
> physical addresses.  Are your addresses above 44-bits?
>

I think they might be.  Kenji?

	-hpa
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/