overlayfs: do not mount on top of idmapped mounts
Prevent overlayfs from being mounted on top of idmapped mounts. Stacking filesystems need to be prevented from being mounted on top of idmapped mounts until they have have been converted to handle this. Link: https://lore.kernel.org/r/20210121131959.646623-29-christian.brauner@ubuntu.com 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 Reviewed-by: James Morris <jamorris@linux.microsoft.com> Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
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@ -858,6 +858,10 @@ static int ovl_mount_dir_noesc(const char *name, struct path *path)
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pr_err("filesystem on '%s' not supported\n", name);
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goto out_put;
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}
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if (mnt_user_ns(path->mnt) != &init_user_ns) {
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pr_err("idmapped layers are currently not supported\n");
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goto out_put;
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}
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if (!d_is_dir(path->dentry)) {
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pr_err("'%s' not a directory\n", name);
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goto out_put;
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