linux-kernel - Re: [PATCH] mmc: card: Don't show eMMC RPMB and BOOT areas in /proc/partitions

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Date:   Tue, 27 Feb 2018 14:56:26 +0000
From:   Alex Lemberg <Alex.Lemberg@....com>
To:     Harish Jenny K N <harish_kandiga@...tor.com>,
        "ulf.hansson@...aro.org" <ulf.hansson@...aro.org>,
        "linus.walleij@...aro.org" <linus.walleij@...aro.org>,
        "adrian.hunter@...el.com" <adrian.hunter@...el.com>,
        "shawn.lin@...k-chips.com" <shawn.lin@...k-chips.com>
CC:     "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mmc: card: Don't show eMMC RPMB and BOOT areas in
 /proc/partitions

While RPMB partition requires special IOCTL

Thanks,
Alex 
On 2/27/18, 1:34 PM, "linux-mmc-owner@...r.kernel.org on behalf of Harish Jenny K N" <linux-mmc-owner@...r.kernel.org on behalf of harish_kandiga@...tor.com> wrote:

    From: Andrew Gabbasov <andrew_gabbasov@...tor.com>
    
    Since RPMB area is accessible via special ioctl only and boot areas
    are unlikely to contain any partitions, exclude them all from listing
    in /proc/partitions. This will hide them from various user-level
    software (e.g. fdisk), thus avoiding unnecessary access attempts.
    
    Signed-off-by: Andrew Gabbasov <andrew_gabbasov@...tor.com>
    Signed-off-by: Harish Jenny K N <harish_kandiga@...tor.com>
    ---
     drivers/mmc/core/block.c | 3 ++-
     1 file changed, 2 insertions(+), 1 deletion(-)
    
    diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
    index 20135a5..376e47e 100644
    --- a/drivers/mmc/core/block.c
    +++ b/drivers/mmc/core/block.c
    @@ -2341,7 +2341,8 @@ static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
     	set_disk_ro(md->disk, md->read_only || default_ro);
     	md->disk->flags = GENHD_FL_EXT_DEVT;
     	if (area_type & (MMC_BLK_DATA_AREA_RPMB | MMC_BLK_DATA_AREA_BOOT))
    -		md->disk->flags |= GENHD_FL_NO_PART_SCAN;
    +		md->disk->flags |= GENHD_FL_NO_PART_SCAN
    +				   | GENHD_FL_SUPPRESS_PARTITION_INFO;
     
     	/*
     	 * As discussed on lkml, GENHD_FL_REMOVABLE should:
    -- 
    1.9.1
    
    --
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