linux-kernel - Re: powerpc/nvram: Fix an incorrect partition merge

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Message-Id: <3rLj4P6Swcz9t6B@ozlabs.org>
Date:	Fri,  3 Jun 2016 21:47:01 +1000 (AEST)
From:	Michael Ellerman <mpe@...erman.id.au>
To:	xinhui <xinhui.pan@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Cc:	Andrzej Hajda <a.hajda@...sung.com>,
	Christophe Jaillet <christophe.jaillet@...adoo.fr>,
	Hari Bathini <hbathini@...ux.vnet.ibm.com>,
	Paul Mackerras <paulus@...ba.org>, tglx@...utronix.de,
	Nathan Fontenot <nfont@...ux.vnet.ibm.com>
Subject: Re: powerpc/nvram: Fix an incorrect partition merge

On Thu, 2015-10-12 at 07:30:02 UTC, xinhui wrote:
> From: Pan Xinhui <xinhui.pan@...ux.vnet.ibm.com>
> 
> When we merge two contiguous partitions whose signatures are marked
> NVRAM_SIG_FREE, We need update prev's length and checksum, then write it
> to nvram, not cur's. So lets fix this mistake now.
> 
> Also use memset instead of strncpy to set the partition's name. It's
> more readable if we want to fill up with duplicate chars .

Does this ever happen in practice? ie. should we backport the fix to stable
kernels?

Has it always been broken?

cheers