linux-kernel - Re: [LINUX PATCH v17 1/2] mtd: rawnand: nand_micron: Do not over write driver's read_page()/write

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20190625141125.a4umdey6ejxjxap4@laureti-dev>
Date:   Tue, 25 Jun 2019 16:11:25 +0200
From:   Helmut Grohne <helmut.grohne@...enta.de>
To:     Naga Sureshkumar Relli <naga.sureshkumar.relli@...inx.com>
CC:     "miquel.raynal@...tlin.com" <miquel.raynal@...tlin.com>,
        "richard@....at" <richard@....at>,
        "dwmw2@...radead.org" <dwmw2@...radead.org>,
        "computersforpeace@...il.com" <computersforpeace@...il.com>,
        "marek.vasut@...il.com" <marek.vasut@...il.com>,
        "vigneshr@...com" <vigneshr@...com>,
        "bbrezillon@...nel.org" <bbrezillon@...nel.org>,
        "yamada.masahiro@...ionext.com" <yamada.masahiro@...ionext.com>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [LINUX PATCH v17 1/2] mtd: rawnand: nand_micron: Do not over
 write driver's read_page()/write_page()

On Tue, Jun 25, 2019 at 06:46:29AM +0200, Naga Sureshkumar Relli wrote:
> --- a/drivers/mtd/nand/raw/nand_micron.c
> +++ b/drivers/mtd/nand/raw/nand_micron.c
> @@ -500,8 +500,11 @@ static int micron_nand_init(struct nand_chip *chip)
>  		chip->ecc.size = 512;
>  		chip->ecc.strength = chip->base.eccreq.strength;
>  		chip->ecc.algo = NAND_ECC_BCH;
> -		chip->ecc.read_page = micron_nand_read_page_on_die_ecc;
> -		chip->ecc.write_page = micron_nand_write_page_on_die_ecc;
> +		if (!chip->ecc.read_page)
> +			chip->ecc.read_page = micron_nand_read_page_on_die_ecc;
> +
> +		if (!chip->ecc.write_page)
> +			chip->ecc.write_page = micron_nand_write_page_on_die_ecc;

When used with pl353_nand.c, this change prioritizes the
pl353_nand_read_page_raw/pl353_nand_write_page_raw implementations over
micron_nand_read_page_on_die_ecc/micron_nand_write_page_on_die_ecc. The
pl353 implementations don't check the status register of the flash for
NAND_ECC_STATUS_WRITE_RECOMMENDED nor do they update ecc_stats.failed in
any way. Unless I am mistaken, this implies that bitflips cannot be
detected at all anymore.

However, this is the change that makes a MT29F2G08ABAEAWP practically
work with jffs2 on the Zynq platform.

In this context, I countered a document from Micron[1] indicating that
their on-die chips are incompatible with jffs2 as is, because the on-die
oob layout is incompatible with jffs2. I suppose that using the raw
variants puts jffs2 in full control of the oob area, but is this really
the correct solution?

Helmut

[1] https://www.micron.com/~/media/Documents/Products/Technical%20Note/NAND%20Flash/tn2975_enable_on-die-ECC_NAND_JFFS2.pdf