linux-kernel - [PATCH] fuse: Allow fully unprivileged mounts

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Message-ID: <87tvqqo8w1.fsf_-_@xmission.com>
Date:   Tue, 29 May 2018 09:04:46 -0500
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     Miklos Szeredi <mszeredi@...hat.com>
Cc:     Miklos Szeredi <miklos@...redi.hu>,
        lkml <linux-kernel@...r.kernel.org>,
        Linux Containers <containers@...ts.linux-foundation.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Alban Crequy <alban@...volk.io>,
        Seth Forshee <seth.forshee@...onical.com>,
        Sargun Dhillon <sargun@...gun.me>,
        Dongsu Park <dongsu@...volk.io>,
        "Serge E. Hallyn" <serge@...lyn.com>
Subject: [PATCH] fuse: Allow fully unprivileged mounts


Now that the fuse and the vfs work is complete.  Allow the fuse filesystem
to be mounted by the root user in a user namespace.

Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
---
 fs/fuse/inode.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 22c76cf8c2e3..48baa26993f3 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -1222,7 +1222,7 @@ static void fuse_kill_sb_anon(struct super_block *sb)
 static struct file_system_type fuse_fs_type = {
 	.owner		= THIS_MODULE,
 	.name		= "fuse",
-	.fs_flags	= FS_HAS_SUBTYPE,
+	.fs_flags	= FS_HAS_SUBTYPE | FS_USERNS_MOUNT,
 	.mount		= fuse_mount,
 	.kill_sb	= fuse_kill_sb_anon,
 };
-- 
2.14.1