linux-kernel - Re: [PATCH v4 11/20] mtd: spi-nor: Check all the bits written, not just the BP ones

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: <037932b0-329f-f974-25b5-ac584ad69262@ti.com>
Date:   Tue, 5 Nov 2019 17:51:44 +0530
From:   Vignesh Raghavendra <vigneshr@...com>
To:     <Tudor.Ambarus@...rochip.com>, <boris.brezillon@...labora.com>
CC:     <miquel.raynal@...tlin.com>, <richard@....at>,
        <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 11/20] mtd: spi-nor: Check all the bits written, not
 just the BP ones



On 02/11/19 4:53 PM, Tudor.Ambarus@...rochip.com wrote:
> From: Tudor Ambarus <tudor.ambarus@...rochip.com>
> 
> Check that all the bits written in the write_sr_and_check() method
> match the status_new received value. Failing to write the other bits
> is dangerous too, extend the check.
> 
> Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
> ---

Reviewed-by: Vignesh Raghavendra <vigneshr@...com>

Regards
Vignesh

>  drivers/mtd/spi-nor/spi-nor.c | 9 ++++-----
>  1 file changed, 4 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
> index 14146619bf19..8f5e9833081b 100644
> --- a/drivers/mtd/spi-nor/spi-nor.c
> +++ b/drivers/mtd/spi-nor/spi-nor.c
> @@ -960,8 +960,7 @@ static int spi_nor_write_sr(struct spi_nor *nor, const u8 *sr, size_t len)
>  }
>  
>  /* Write status register and ensure bits in mask match written values */
> -static int spi_nor_write_sr_and_check(struct spi_nor *nor, u8 status_new,
> -				      u8 mask)
> +static int spi_nor_write_sr_and_check(struct spi_nor *nor, u8 status_new)
>  {
>  	int ret;
>  
> @@ -975,7 +974,7 @@ static int spi_nor_write_sr_and_check(struct spi_nor *nor, u8 status_new,
>  	if (ret)
>  		return ret;
>  
> -	return ((nor->bouncebuf[0] & mask) != (status_new & mask)) ? -EIO : 0;
> +	return (nor->bouncebuf[0] != status_new) ? -EIO : 0;
>  }
>  
>  /**
> @@ -1774,7 +1773,7 @@ static int stm_lock(struct spi_nor *nor, loff_t ofs, uint64_t len)
>  	if ((status_new & mask) < (status_old & mask))
>  		return -EINVAL;
>  
> -	return spi_nor_write_sr_and_check(nor, status_new, mask);
> +	return spi_nor_write_sr_and_check(nor, status_new);
>  }
>  
>  /*
> @@ -1859,7 +1858,7 @@ static int stm_unlock(struct spi_nor *nor, loff_t ofs, uint64_t len)
>  	if ((status_new & mask) > (status_old & mask))
>  		return -EINVAL;
>  
> -	return spi_nor_write_sr_and_check(nor, status_new, mask);
> +	return spi_nor_write_sr_and_check(nor, status_new);
>  }
>  
>  /*
> 

-- 
Regards
Vignesh