linux-kernel - [PATCH 3.16 101/366] ubi: Fix error for write access

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Message-ID: <lsq.1539530741.202935637@decadent.org.uk>
Date:   Sun, 14 Oct 2018 16:25:41 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Richard Weinberger" <richard@....at>,
        "Romain Izard" <romain.izard.pro@...il.com>
Subject: [PATCH 3.16 101/366] ubi: Fix error for write access

3.16.60-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Romain Izard <romain.izard.pro@...il.com>

commit 78a8dfbabbece22bee58ac4cb26cab10e7a19c5d upstream.

When opening a device with write access, ubiblock_open returns an error
code. Currently, this error code is -EPERM, but this is not the right
value.

The open function for other block devices returns -EROFS when opening
read-only devices with FMODE_WRITE set. When used with dm-verity, the
veritysetup userspace tool is expecting EROFS, and refuses to use the
ubiblock device.

Use -EROFS for ubiblock as well. As a result, veritysetup accepts the
ubiblock device as valid.

Fixes: 9d54c8a33eec (UBI: R/O block driver on top of UBI volumes)
Signed-off-by: Romain Izard <romain.izard.pro@...il.com>
Signed-off-by: Richard Weinberger <richard@....at>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/mtd/ubi/block.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/mtd/ubi/block.c
+++ b/drivers/mtd/ubi/block.c
@@ -322,7 +322,7 @@ static int ubiblock_open(struct block_de
 	 * in any case.
 	 */
 	if (mode & FMODE_WRITE) {
-		ret = -EPERM;
+		ret = -EROFS;
 		goto out_unlock;
 	}