linux-kernel - [PATCH AUTOSEL 5.4 20/52] afs: Fix SELinux setting security label on /afs

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Message-Id: <20191220142954.9500-20-sashal@kernel.org>
Date:   Fri, 20 Dec 2019 09:29:22 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     David Howells <dhowells@...hat.com>,
        Marc Dionne <marc.dionne@...istor.com>,
        selinux@...r.kernel.org, linux-security-module@...r.kernel.org,
        Sasha Levin <sashal@...nel.org>, linux-afs@...ts.infradead.org
Subject: [PATCH AUTOSEL 5.4 20/52] afs: Fix SELinux setting security label on /afs

From: David Howells <dhowells@...hat.com>

[ Upstream commit bcbccaf2edcf1b76f73f890e968babef446151a4 ]

Make the AFS dynamic root superblock R/W so that SELinux can set the
security label on it.  Without this, upgrades to, say, the Fedora
filesystem-afs RPM fail if afs is mounted on it because the SELinux label
can't be (re-)applied.

It might be better to make it possible to bypass the R/O check for LSM
label application through setxattr.

Fixes: 4d673da14533 ("afs: Support the AFS dynamic root")
Signed-off-by: David Howells <dhowells@...hat.com>
Reviewed-by: Marc Dionne <marc.dionne@...istor.com>
cc: selinux@...r.kernel.org
cc: linux-security-module@...r.kernel.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/afs/super.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/fs/afs/super.c b/fs/afs/super.c
index 488641b1a418d..d9a6036b70b9f 100644
--- a/fs/afs/super.c
+++ b/fs/afs/super.c
@@ -448,7 +448,6 @@ static int afs_fill_super(struct super_block *sb, struct afs_fs_context *ctx)
 	/* allocate the root inode and dentry */
 	if (as->dyn_root) {
 		inode = afs_iget_pseudo_dir(sb, true);
-		sb->s_flags	|= SB_RDONLY;
 	} else {
 		sprintf(sb->s_id, "%llu", as->volume->vid);
 		afs_activate_volume(as->volume);
-- 
2.20.1