linux-kernel - [PATCH] selinux: make return code consistent with conflicting context= settings on same superblock

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Message-Id: <1368038420-19879-1-git-send-email-jlayton@redhat.com>
Date:	Wed,  8 May 2013 14:40:20 -0400
From:	Jeff Layton <jlayton@...hat.com>
To:	sds@...ho.nsa.gov, james.l.morris@...cle.com, eparis@...isplace.org
Cc:	linux-security-module@...r.kernel.org, linux-nfs@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] selinux: make return code consistent with conflicting context= settings on same superblock

Commit 094f7b69ea73 adds a new check to ensure that when we clone an
existing superblock that the contexts match properly. We do however have
another place where you can hit similar problems in
selinux_set_mnt_opts. That function returns -EINVAL, whereas
selinux_sb_clone_mnt_opts returns -EBUSY in this situation.

I think -EBUSY is probably more descriptive of the situation here. The
context= option would have worked had the superblock not already been in
use. Fix selinux_set_mnt_opts to return -EBUSY instead of -EINVAL in
this situation.

Signed-off-by: Jeff Layton <jlayton@...hat.com>
---
 security/selinux/hooks.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 5c6f2cd..348f069 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -745,7 +745,7 @@ out:
 	mutex_unlock(&sbsec->lock);
 	return rc;
 out_double_mount:
-	rc = -EINVAL;
+	rc = -EBUSY;
 	printk(KERN_WARNING "SELinux: mount invalid.  Same superblock, different "
 	       "security settings for (dev %s, type %s)\n", sb->s_id, name);
 	goto out;
-- 
1.7.1

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