linux-kernel - Re: [PATCH 05/13] kexec: Make kexec_segment user buffer pointer a union

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Message-ID: <20140604103423.GD4105@pd.tnic>
Date:	Wed, 4 Jun 2014 12:34:23 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	linux-kernel@...r.kernel.org, kexec@...ts.infradead.org,
	ebiederm@...ssion.com, hpa@...or.com, mjg59@...f.ucam.org,
	greg@...ah.com, jkosina@...e.cz, dyoung@...hat.com,
	chaowang@...hat.com, bhe@...hat.com, akpm@...ux-foundation.org
Subject: Re: [PATCH 05/13] kexec: Make kexec_segment user buffer pointer a
 union

On Tue, Jun 03, 2014 at 09:06:54AM -0400, Vivek Goyal wrote:
> So far kexec_segment->buf was always a user space pointer as user space
> passed the array of kexec_segment structures and kernel copied it.
> 
> But with new system call, list of kexec segments will be prepared by
> kernel and kexec_segment->buf will point to a kernel memory.
> 
> So while I was adding code where I made assumption that ->buf is pointing
> to kernel memory, sparse started giving warning.
> 
> Make ->buf a union. And where a user space pointer is expected, access
> it using ->buf and where a kernel space pointer is expected, access it
> using ->kbuf. That takes care of sparse warnings.
> 
> Signed-off-by: Vivek Goyal <vgoyal@...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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