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

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Date:   Tue, 27 Feb 2018 17:03:49 +0530
From:   Harish Jenny K N <harish_kandiga@...tor.com>
To:     <ulf.hansson@...aro.org>, <linus.walleij@...aro.org>,
        <adrian.hunter@...el.com>, <shawn.lin@...k-chips.com>
CC:     <linux-mmc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <harish_kandiga@...tor.com>
Subject: [PATCH] mmc: card: Don't show eMMC RPMB and BOOT areas in /proc/partitions

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