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dm: eliminate potential source of excessive kernel log noise

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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>
This commit is contained in:
Mike Snitzer 2021-01-06 18:19:05 -05:00 committed by Greg Kroah-Hartman
parent a34294774a
commit 2c3d03cdbd
1 changed files with 1 additions and 1 deletions
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2
drivers/md/dm.c
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@ -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;