From: Mike Snitzer <snitzer@redhat.com>
Date: Wed, 6 Jan 2021 23:19:05 +0000 (-0500)
Subject: dm: eliminate potential source of excessive kernel log noise
X-Git-Tag: v5.4.91~6
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=2c3d03cdbd395a619b0b9503a110dd51244b9a48;p=thirdparty%2Fkernel%2Fstable.git

dm: eliminate potential source of excessive kernel log noise

commit 0378c625afe80eb3f212adae42cc33c9f6f31abf upstream.

There wasn't ever a real need to log an error in the kernel log for
ioctls issued with insufficient permissions. Simply return an error
and if an admin/user is sufficiently motivated they can enable DM's
dynamic debugging to see an explanation for why the ioctls were
disallowed.

Reported-by: Nir Soffer <nsoffer@redhat.com>
Fixes: e980f62353c6 ("dm: don't allow ioctls to targets that don't map to whole devices")
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index bf3c2a1159e68..c6ce42daff27b 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -548,7 +548,7 @@ static int dm_blk_ioctl(struct block_device *bdev, fmode_t mode,
 		 * subset of the parent bdev; require extra privileges.
 		 */
 		if (!capable(CAP_SYS_RAWIO)) {
-			DMWARN_LIMIT(
+			DMDEBUG_LIMIT(
 	"%s: sending ioctl %x to DM device without required privilege.",
 				current->comm, cmd);
 			r = -ENOIOCTLCMD;