linux-kernel - RE: [PATCH] block: add verifier for cmdline partition

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Message-ID: <C3050A4DBA34F345975765E43127F10F8B77159A@dggemm511-mbs.china.huawei.com>
Date:   Fri, 4 May 2018 07:07:30 +0000
From:   Caizhiyong <caizhiyong@...ilicon.com>
To:     Wang YanQing <udknight@...il.com>,
        "axboe@...nel.dk" <axboe@...nel.dk>
CC:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "pombredanne@...b.com" <pombredanne@...b.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Jiangheng <jiangheng@...ilicon.com>
Subject: RE: [PATCH] block: add verifier for cmdline partition

> -----Original Message-----
> From: Wang YanQing [mailto:udknight@...il.com]
> Sent: Thursday, May 03, 2018 7:18 PM
> To: axboe@...nel.dk
> Cc: gregkh@...uxfoundation.org; pombredanne@...b.com;
> tglx@...utronix.de; Caizhiyong <caizhiyong@...ilicon.com>; linux-
> block@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: [PATCH] block: add verifier for cmdline partition
> 
> I meet strange filesystem corruption issue recently, the reason
> is there are overlaps partitions in cmdline partition argument.
> 
> This patch add verifier for cmdline partition, then if there are
> overlaps partitions, cmdline_partition will return error and log
> a error message.
> 

Partition overlap was intentionally designed in this cmdline partition.
some time, the cmdline partition save raw data(not filesystem), the overlap makes data  access very convenient.

reference  http://lists.infradead.org/pipermail/linux-mtd/2013-August/048092.html

> Signed-off-by: Wang YanQing <udknight@...il.com>
> ---
>  block/partitions/cmdline.c | 63
> +++++++++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 62 insertions(+), 1 deletion(-)
>