linux-kernel - Re: [PATCH 4/6] x86: Only direct map addresses that are marked as E820

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, 29 Aug 2012 23:28:16 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Borislav Petkov <bp@...64.org>, Yinghai Lu <yinghai@...nel.org>
CC:	Jacob Shin <jacob.shin@....com>, X86-ML <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>, Tejun Heo <tj@...nel.org>,
	Dave Young <dyoung@...hat.com>,
	Chao Wang <chaowang@...hat.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	Andreas Herrmann <andreas.herrmann3@....com>
Subject: Re: [PATCH 4/6] x86: Only direct map addresses that are marked as E820_RAM

This week is Kernel Summit & Plumbers... people are kind of distracted.

Borislav Petkov <bp@...64.org> wrote:

>On Wed, Aug 29, 2012 at 02:17:51PM -0700, Yinghai Lu wrote:
>> > +struct range pfn_mapped[E820_X_MAX];
>> > +int nr_pfn_mapped;
>> 
>> change to static?
>> 
>> > +
>> > +void add_pfn_range_mapped(unsigned long start_pfn, unsigned long
>end_pfn)
>> > +{
>> > +       nr_pfn_mapped = add_range_with_merge(pfn_mapped,
>E820_X_MAX,
>> > +                                            nr_pfn_mapped,
>start_pfn, end_pfn);
>> > +       nr_pfn_mapped = clean_sort_range(pfn_mapped, E820_X_MAX);
>> > +
>> > +       max_pfn_mapped = max(max_pfn_mapped, end_pfn);
>> > +
>> > +       if (end_pfn <= (1UL << (32 - PAGE_SHIFT)))
>> > +               max_low_pfn_mapped = max(max_low_pfn_mapped,
>end_pfn);
>> > +}
>> > +
>> > +bool pfn_range_is_mapped(unsigned long start_pfn, unsigned long
>end_pfn)
>> > +{
>> > +       int i;
>> > +
>> > +       for (i = 0; i < nr_pfn_mapped; i++)
>> > +               if ((start_pfn >= pfn_mapped[i].start) &&
>> > +                   (end_pfn <= pfn_mapped[i].end))
>> > +                       return true;
>> > +
>> > +       return false;
>> > +}
>> > +
>> > +bool pfn_is_mapped(unsigned long pfn)
>> > +{
>> > +       return pfn_range_is_mapped(pfn, pfn + 1);
>> > +}
>> 
>> wonder if those functions have to be in arch/x86/kernel/setup.c.
>> 
>> also do we need to update the tracking array when we have do memory
>hot-remove?
>
>Would you please make sure you've reviewed this whole patchset
>thoroughly so that Jacob can do all changes at once and not keep
>resending them twice a week.
>
>Thanks a lot!
>
>-- 
>Regards/Gruss,
>Boris.
>
>Advanced Micro Devices GmbH
>Einsteinring 24, 85609 Dornach
>GM: Alberto Bozzo
>Reg: Dornach, Landkreis Muenchen
>HRB Nr. 43632 WEEE Registernr: 129 19551

-- 
Sent from my mobile phone. Please excuse brevity and lack of formatting.
--
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/