linux-kernel - Re: [PATCH v5 12/14] x86: export x86 boot

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Date:	Fri, 13 Dec 2013 21:04:12 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Dave Young <dyoung@...hat.com>
Cc:	linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org,
	x86@...nel.org, mjg59@...f.ucam.org, hpa@...or.com,
	James.Bottomley@...senPartnership.com, vgoyal@...hat.com,
	ebiederm@...ssion.com, horms@...ge.net.au,
	kexec@...ts.infradead.org, greg@...ah.com, matt@...sole-pimps.org,
	toshi.kani@...com
Subject: Re: [PATCH v5 12/14] x86: export x86 boot_params to sysfs

On Mon, Dec 09, 2013 at 05:42:25PM +0800, Dave Young wrote:
> kexec-tools use boot_params for getting the 1st kernel hardware_subarch,
> the kexec kernel efi runtime support also need read the old efi_info from
> boot_params. Currently it exists in debugfs which is not a good place for
> such infomation. Per HPA, we should avoid of "sploit debugfs".
> 
> In this patch /sys/kernel/boot_params are exported, also the setup_data is
> exported as a subdirectory. kexec-tools is using debugfs for hardware_subarch
> for a long time now so we're not removing it yet.
> 
> Structure is like below:
> 
> /sys/kernel/boot_params
> |__ data                /* boot_params in binary*/
> |__ setup_data
> |   |__ 0               /* the first setup_data node */
> |   |   |__ data        /* setup_data node 0 in binary*/
> |   |   |__ type        /* setup_data type of setup_data node 0, hex string */
> [snip]
> |__ version             /* boot protocal version (in hex, "0x" prefixed)*/
> 
> Changelog:
> Greg: use __ATTR_RO() and group attr.
> Matt and Boris: Documentation improvement, code indentation.
> 
> Signed-off-by: Dave Young <dyoung@...hat.com>

Acked-by: Borislav Petkov <bp@...e.de>

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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