linux-kernel - Re: MTD: How to get actual image size from MTD partition

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Message-ID: <YPGojf7hX//Wn5su@kroah.com>
Date:   Fri, 16 Jul 2021 17:41:01 +0200
From:   Greg KH <greg@...ah.com>
To:     Pintu Agarwal <pintu.ping@...il.com>
Cc:     open list <linux-kernel@...r.kernel.org>,
        linux-mtd <linux-mtd@...ts.infradead.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Phillip Lougher <phillip@...ashfs.org.uk>,
        Sean Nyekjaer <sean@...nix.com>,
        Kernelnewbies <kernelnewbies@...nelnewbies.org>,
        Richard Weinberger <richard@....at>
Subject: Re: MTD: How to get actual image size from MTD partition

On Fri, Jul 16, 2021 at 12:12:41PM +0530, Pintu Agarwal wrote:
> Hi,
> 
> Our ARM32 Linux embedded system consists of these:
> * Linux Kernel: 4.14
> * Processor: Qualcomm Arm32 Cortex-A7
> * Storage: NAND 512MB
> * Platform: Simple busybox
> * Filesystem: UBIFS, Squashfs
> * Consists of nand raw partitions, squashfs ubi volumes.
> 
> My requirement:
> To find the checksum of a real image in runtime which is flashed in an
> MTD partition.

Try using the dm-verity module for ensuring that a block device really
is properly signed before mounting it.  That's what it was designed for
and is independent of the block device type.

good luck!

greg k-h