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From:   Christian Brauner <christian.brauner@ubuntu.com>
To:     Alexander Viro <viro@zeniv.linux.org.uk>,
        Christoph Hellwig <hch@infradead.org>,
        linux-fsdevel@vger.kernel.org
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        Christian Brauner <christian.brauner@ubuntu.com>,
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Subject: [PATCH v2 36/39] overlayfs: do not mount on top of idmapped mounts
Date:   Sun, 15 Nov 2020 11:37:15 +0100
Message-Id: <20201115103718.298186-37-christian.brauner@ubuntu.com>
In-Reply-To: <20201115103718.298186-1-christian.brauner@ubuntu.com>
References: <20201115103718.298186-1-christian.brauner@ubuntu.com>
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Prevent overlayfs from being mounted on top of idmapped mounts until we
have ported it to handle this case and added proper testing for it.

Cc: Christoph Hellwig <hch@lst.de>
Cc: David Howells <dhowells@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: linux-fsdevel@vger.kernel.org
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
---
/* v2 */
patch introduced
---
 fs/overlayfs/super.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index 0d4f2baf6836..3cacc3d3fb65 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -1708,6 +1708,12 @@ static struct ovl_entry *ovl_get_lowerstack(struct super_block *sb,
 		if (err)
 			goto out_err;
 
+		if (mnt_idmapped(stack[i].mnt)) {
+			err = -EINVAL;
+			pr_err("idmapped lower layers are currently unsupported\n");
+			goto out_err;
+		}
+
 		lower = strchr(lower, '\0') + 1;
 	}
 
@@ -1939,6 +1945,12 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
 		if (err)
 			goto out_err;
 
+		if (mnt_idmapped(upperpath.mnt)) {
+			err = -EINVAL;
+			pr_err("idmapped lower layers are currently unsupported\n");
+			goto out_err;
+		}
+
 		err = ovl_get_workdir(sb, ofs, &upperpath);
 		if (err)
 			goto out_err;
-- 
2.29.2